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107-466: The Denny Substation is an electrical substation located in the South Lake Union neighborhood of Seattle, Washington , and operated by Seattle City Light . The facility takes up a whole city block along Denny Way and features a community center , interpretive exhibits, a dog park , and public art . The substation was proposed in the early 2000s, during redevelopment of South Lake Union into

214-447: A bus plus some circuit breakers . The largest transmission substations can cover a large area (several acres/hectares) with multiple voltage levels, many circuit breakers, and a large amount of protection and control equipment ( voltage and current transformers , relays and SCADA systems). Modern substations may be implemented using international standards such as IEC Standard 61850 . A distribution substation transfers power from

321-401: A contractor or alternately all phases of its development may be handled by the electrical utility . Most commonly, the utility does the engineering and procurement while hiring a contractor for actual construction. Major design constraints for construction of substations include land availability and cost, limitations on the construction period, transportation restrictions, and the need to get

428-535: A $ 160 million substation in Interbay or South Lake Union in 2003, expecting the additional high tech firms to put a strain on the Broad Street substation and neighborhood lines laid in the early 2000s. In 2005, Seattle City Light determined that adding capacity at the Broad Street substation through new transformer banks would be sufficient for the area's needs until the mid-2010s. Seattle City Light proposed demolishing

535-706: A disconnection of the load supplied by the circuit break from the feeding point. This seeks to isolate the fault point from the rest of the system, and allow the rest of the system to continue operating with minimal impact. Both switches and circuit breakers may be operated locally (within the substation) or remotely from a supervisory control center. With overhead transmission lines , the propagation of lightning and switching surges can cause insulation failures into substation equipment. Line entrance surge arrestors are used to protect substation equipment accordingly. Insulation Coordination studies are carried out extensively to ensure equipment failure (and associated outages )

642-464: A facility that would "engage [with] the community, to make it an amenity and not a distraction". When first proposed in the 2000s, the substation project was estimated to cost up to $ 150 million because of space limits and mitigation. The price rose to $ 174 million by 2014 after integration of public benefits and open space, as well as the relocation of the Amazon headquarters to nearby Denny Triangle. After

749-529: A few decades, a culture of public political gatherings and outdoor cafes emerged. Non-sustainable gardening , including mowing , use of chemical fertilisers , herbicides and pesticides harm green spaces. Contrariwise, one of the conditions for good urban open space is sustainable gardening . At the beginning of the 21st century, studies began to show that living in areas near water (known as " blue spaces ") considerably improved physical and mental health, increasing life longevity. Green space access

856-744: A four-fold pattern called chahar bagh or chahār bāgh . often appearing as fountains, flowing channels, or reflective pools. Modern interpretations of Islamic gardens can be found in various locations, such as the Islamic Gardens at King's Cross in London, which showcase contemporary landscaped spaces representing the diversity of Muslim culture. The concept of Islamic gardens spread widely from Persia to Spain, North Africa, and India, influencing garden design across various Islamic empires. While maintaining core principles, these gardens often incorporated local elements and adapted to regional climate. London has

963-507: A good social network feel socially included, promoting more confidence and well-being in their everyday lives. Overall, the bonding experiences that result from urban green spaces tie in with a child's cognitive and social development. A 2021 study found that higher exposure to woodland urban green spaces or urban forest but not grassland is associated with improved cognitive development and reduced risks of mental problems for urban adolescents . The term "rus in urbe" meaning "country in

1070-441: A high risk of prevalence rhinitis, allergic sensitization, wheezing, and asthma among children 7 years-old. More studies are needed to explain the effect of urban green spaces on children relating to air quality. These studies should take into consideration the interconnectedness of tree species, geographic areas, temperature, and other pollutant-like traffic. The adolescent years are extremely important for children due to it being

1177-524: A high-tech hub. A former Greyhound bus garage was acquired by Seattle City Light and demolished in 2014. Construction on the Denny Substation, including a street vacation to close part of Pontius Avenue, began in 2016 and was completed in 2018, at a cost of $ 210 million. Historically, the South Lake Union neighborhood of Seattle, located to the north of downtown and east of the Seattle Center ,

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1284-457: A large substation, circuit breakers are used to interrupt any short circuits or overload currents that may occur on the network. Smaller distribution stations may use recloser circuit breakers or fuses for protection of distribution circuits. Substations themselves do not usually have generators, although a power plant may have a substation nearby. Other devices such as capacitors , voltage regulators , and reactors may also be located at

1391-522: A long lease such as a renewable 99-year lease, giving the utility company security of tenure . The first step in planning a substation layout is the preparation of a one-line diagram , which shows in simplified form the switching and protection arrangement required, as well as the incoming supply lines and outgoing feeders or transmission lines. It is a usual practice by many electrical utilities to prepare one-line diagrams with principal elements (lines, switches, circuit breakers, transformers) arranged on

1498-484: A long history of urban open space, which has significantly influenced development of modern parks, and is still among the greenest capital cities in the world. The basis for many urban open spaces seen today across Europe and the West began its process of development in London in the 17th and 18th centuries. What would eventually become urban open green space began as paved public plazas . Though they were intended to be open to

1605-461: A lower income, explained by the pattern that wealthier individuals reside in areas more concentrated with green space. Urban open spaces in higher socioeconomic neighborhoods were also more likely to have trees that provided shade, a water feature (e.g. pond, lake and creek), walking and cycling paths, lighting, signage regarding dog access and signage restricting other activities as well. This difference in access has been proven, however, further study

1712-530: A neighborhood. Even when physical activity rates are not shown to increase with greater access to green space, greater access to green space has been shown to decrease stress and improve social cohesion. Adequate urban green space access can be associated with better respiratory health outcomes, as long as green space areas meet certain requirements.  A new study showed that mortality due to pneumonia and chronic lower respiratory diseases could be reduced by minimizing fragmentation of green spaces and increasing

1819-529: A protective factor against respiratory disease. Exposure to nature improves the immune system . Contact of the human body with soil , turf , or forest floor , exposes it to many microorganisms which boost the immune system. Improved access to green space is associated with reductions in cardiovascular disease symptoms, improved rates of physical activity , lower incidence of obesity , and improved respiratory health. Lower rates of cardiovascular biomarkers are associated with access to green space, showing

1926-539: A reduction in cardiovascular disease risk in populations living within 1 km of green space. Not only does access to urban green space reduce risk of cardiovascular disease, but increased access has been shown to improve recovery from major adverse cardiovascular events and lower all-cause mortality. Relationships have been found between increased access to green space, improved rates of physical activity, and reduced BMI. The percentage of sedentary and moderately active persons making use of an urban park increased when access to

2033-418: A reprieve from the urban environment and a break from over-stimulation . Studies done on physically active adults middle-aged and older show that there are amplified benefits when physical activities are coupled with green space environments. Such coupling leads to decreased levels of stress , lowers the risk for depression , and increases the frequency of participation in exercise. Green spaces may improve

2140-690: A ring bus, double bus, or so-called "breaker and a half" setup can be used, so that the failure of any one circuit breaker does not interrupt power to other circuits, and so that parts of the substation may be de-energized for maintenance and repairs. Substations feeding only a single industrial load may have minimal switching provisions, especially for small installations. Because of the risk of electrical shock, substations are inherently dangerous to electrical workers. To mitigate this hazard, substations are designed with various safety features. Live conductors and bare equipment are kept separate, either with protected equipment, or using screens or distance. Based on

2247-482: A strip of colored lights that change based on wind flows. Earlier design concepts featured a more standard substation with 40-foot-high (12 m) walls, or incorporating the facility into the base of a high-rise building . The chosen design was described as a "a celebration of the functionality" and called the "coolest electrical substation ever" by Slate . Lead designer John Savo of NBBJ stated that they "[didn't] want it to be your grandfather's substation", desiring

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2354-679: A substation. Substations may be on the surface in fenced enclosures, underground, or special-purpose buildings. High-rise buildings may have several indoor substations. Indoor substations are usually found in urban areas to reduce the noise from transformers, improve appearance, or protect switchgear from extreme climate or pollution. Substations often use busbars as conductors between electrical equipment. Busbars may be aluminum tubing 3–6 inches (76–152 mm) thick, or else wires (strain bus). Outdoor, above-ground substation structures include wood pole, lattice metal tower, and tubular metal structures, although other variants are available. Where space

2461-528: A time of growth, development, and instillation of habits. When children are given the opportunity to be active, they typically take advantage of it. Children with a greater access to parks and recreational facilities through urban green space have been found to be more active than children who lack access. The access to green spaces has shown an association with recreational walking, increased physical activity, and reduced sedentary time in all ages. In coordination, it has been seen that higher residential green space

2568-422: A transmission line or a transformer. To maintain reliability of supply, companies aim at keeping the system up and running while performing maintenance. All work to be performed, from routine testing to adding entirely new substations, should be done while keeping the whole system running. Unplanned switching events are caused by a fault in a transmission line or any other component, for example: The function of

2675-602: Is aimed at minimizing cost while ensuring power availability and reliability, and enabling changes to the substation in the future. Substations may be built outdoors, indoors, or underground or in a combination of these locations. Selection of the location of a substation must consider many factors. Sufficient land area is required for installation of equipment with necessary clearances for electrical safety, and for access to maintain large apparatus such as transformers. The site must have room for expansion due to load growth or planned transmission additions. Environmental effects of

2782-1013: Is associated with lower BMI scores. If children are given the opportunity to be active and maintain a healthy BMI in their adolescent years, they are less likely to be obese as adults. Children exposed to urban green spaces have the opportunity to expend energy by interacting with their environment and other people through exercise. One study has shown that without access to urban green spaces, some children have problems with hyperactivity, peer interactions, and good conduct. The important interactions with nature, animals, and peers have been positively influential in child development and reduction in behavioral issues such as Attention Deficit Hyperactivity Disorder (ADHD). Urban green spaces allow children to expel their extra energy and improve their ability to focus when needed both at school and home. In addition to behavioral problems, and likely connected, access to urban green space has been proven to be helpful for cognitive development. With urban green space giving children

2889-465: Is common in the area. The output is a number of feeders. Distribution voltages are typically medium voltage, between 2.4 kV and 33 kV, depending on the size of the area served and the practices of the local utility. The feeders run along streets overhead (or underground, in some cases) and power the distribution transformers at or near the customer premises. In addition to transforming voltage, distribution substations also isolate faults in either

2996-528: Is higher in populations with a higher percentage of green space in their environments. Urban open space access has also been directly related to reductions in the prevalence and severity of chronic diseases resulting from sedentary lifestyles, to improvements in mental well-being, and to reductions in population-wide health impacts from climate change . Access to urban open space encourages physical activity and reduces ambient air pollution, heat, traffic noise and emissions . All are factors which contribute to

3103-402: Is minimal. Once past the switching components, the lines of a given voltage connect to one or more buses . These are sets of busbars , usually in multiples of three, since three-phase electrical power distribution is largely universal around the world. The arrangement of switches, circuit breakers, and buses used affects the cost and reliability of the substation. For important substations

3210-474: Is necessary to work on parts of the substation while energized, but employees must maintain a safe distance of at least 3 metres (9.8 ft). The aim to reduce substation footprints comes into conflict with ease of maintenance enhanced by including gaps where employees can safely work. Underneath a substation, a mat or grid of conductors laid around 0.5 or 0.6 metres (1 ft 8 in or 2 ft 0 in) underground provides grounding . This grid, which

3317-465: Is needed to evaluate the exact health impacts. A study conducted in Australia provided insight into how there is a correlation between community development/community safety and natural open space within the community. Open areas allow community members to engage in highly social activities and facilitate the expansion of social networks and friendship development. As people become more social they decrease

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3424-492: Is not sufficient; the quality of the urban green space is important as well. Urban open space is often appreciated for the recreational opportunities it provides. Examples of recreation in urban open spaces include active recreation (such as organized sports and individual exercise) and passive recreation. Research shows that when open spaces are attractive and accessible, people are more likely to engage in physical activity. Time spent in an urban open space for recreation offers

3531-457: Is planned to be linked to another downtown substation after 2020. The Denny Substation features an unusual design that incorporates public spaces and community amenities into an otherwise utilitarian structure. The 110,000 sq ft (10,000 m) substation, designed by architectural firm NBBJ , is shaped in the form of an acute trapezoid , with its longest side facing Denny Way. The structure slopes inward, allowing for sunlight to reach

3638-472: Is plentiful and appearance of the station is not a factor, steel lattice towers provide low-cost supports for transmission lines and apparatus. Low-profile substations may be specified in suburban areas where appearance is more critical. Indoor substations may be gas insulated substations (GIS) (at high voltages, with gas insulated switchgear), or use metal-enclosed or metal-clad switchgear at lower voltages. Urban and suburban indoor substations may be finished on

3745-414: Is related to health inequality for minority populations.  Neighborhoods with higher percentages of minority residents often have lower access to open space and parks as the result of past red-lining policies and current inequities in funding priorities. Urban open space is under strong pressure. Due to increasing urbanization , combined with a spatial planning policy of densification , more people face

3852-451: Is typically copper although it may be galvanized iron in some countries, is used to ground circuits that are being worked on to prevent accidental re-energization while workers are in contact with a de-energized circuit. Often, earth rods are driven deeper into the ground from the grounding grid for lower resistance grounding, and may be surrounded by bentonite or marconite to further reduce resistance and ensure effective grounding for

3959-410: Is used as a protection device to interrupt fault currents automatically, and may be used to switch loads on and off, or to cut off a line when power is flowing in the 'wrong' direction. When a large fault current flows through the circuit breaker, this is detected through the use of current transformers . The magnitude of the current transformer outputs may be used to trip the circuit breaker resulting in

4066-618: Is where all transmission lines have the same voltage. In such cases, substation contains high-voltage switches that allow lines to be connected or isolated for fault clearance or maintenance. A transmission station may have transformers to convert between two transmission voltages, voltage control / power factor correction devices such as capacitors, reactors or static VAR compensators and equipment such as phase shifting transformers to control power flow between two adjacent power systems. Transmission substations can range from simple to complex. A small "switching station" may be little more than

4173-560: The Greyhound bus garage on Denny Way for its new substation in 2006, with consultants recommending that the city acquire the site for $ 40 million as soon as possible. The site was purchased by Seattle City Light in October 2008 and vacated by Greyhound in 2010. From 2012 to 2014, Seattle City Light demolished the Greyhound facility and removed contaminated soils in preparation for construction. During

4280-411: The hydroelectric facilities located around the region. The substation has two major pieces of public art , as part of the municipal percent for art program. Transforest by Lead Pencil Studio is a 110-foot-tall (34 m) sculpture that combines the forms of an old-growth tree and a modern transmission tower . On the exterior walls of the substation house Ned Khan's Switchwall , consisting of

4387-416: The microprocessor made for an exponential increase in the number of points that could be economically controlled and monitored. Today, standardized communication protocols such as DNP3 , IEC 61850 and Modbus , to list a few, are used to allow multiple intelligent electronic devices to communicate with each other and supervisory control centers. Distributed automatic control at substations is one element of

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4494-594: The urban heat island effect. Historically, access to urban green space has favored wealthier and more privileged communities; thus, recent urban greening has increasingly focused on environmental justice concerns, and community engagement in the greening process. In particular, in cities with economic decline, such as the Rust Belt in the United States, urban greening has broad community revitalization impacts. Urban areas have greatly expanded, resulting in over half of

4601-458: The Czech Republic, where power is collected from nearby lignite -fired power plants. If no transformers are required for increasing the voltage to transmission level, the substation is a switching station. Converter substations may be associated with HVDC converter plants, traction current , or interconnected non-synchronous networks. These stations contain power electronic devices to change

4708-531: The Earth's atmosphere and trees play an essential role in removing human-made pollutants from the air, aka particulate matter (PM). Trees produce oxygen and absorb CO 2 . In urban green spaces, trees filter out man-made pollutants. Air quality data collected on cities with and without urban green space has shown that areas with an abundance of trees have considerably less air pollutants, i.e. O 3 , PM 10 , NO 2 , SO 2 , and CO. As air pollutants accumulate in

4815-422: The air quality of urban areas and provide habitat for wildlife, improving the overall ecological health of urban environments. They may also reduce the risk of flooding by providing rainwater drainage . The aesthetic value of urban open spaces is self-evident. People enjoy viewing nature, especially when it is otherwise extensively deprived, as is the case in urban environments. Therefore, open space offers

4922-591: The amps exceed a certain amount over a period of time. Reclosers will attempt to re-energize the circuit after a delay. If unsuccessful for a few times, the recloser will have to be manually reset by an electrical worker. Capacitor banks are used in substations to balance the lagging current draw from inductive loads (such as motors, transformers, and some industrial equipment) with their reactive load . Additional capacitor capacity may be needed if dispersed generation (such as small diesel generators, rooftop photovoltaic solar panels , or wind turbines ) are added to

5029-468: The atmosphere, vulnerable populations, such as children, may suffer from increased incidences of respiratory disease. Particulate matter or particle pollution with a diameter of 10 microns (PM10) or 2.5 microns (PM2.5) is associated with heart diseases and respiratory diseases including lung cancer. Globally, particulate matter has increased over 28% in indoor air and 35% in outdoor air. Children spend most of their time at school, around 10 hours daily, and

5136-399: The cities designed to try to solve the problem. The distance an individual lives from a green space or park and the proportion of land designated as open space/parks has been shown to be inversely related to anxiety/ mood disorder treatment counts in the community. Improved mental health may therefore be related to both measures - to distance from open space and proportion of open space within

5243-572: The city government in 2018 later concluded that the overall demand in the Denny Triangle and South Lake Union area would rise to 60 megawatts by 2027, far below the 180-megawatt capacity that the substation was designed for. Electrical substation Substations may be owned and operated by an electrical utility, or may be owned by a large industrial or commercial customer. Generally substations are unattended, relying on SCADA for remote supervision and control. The word substation comes from

5350-647: The city" was used in Rome around the first century C.E. Urban planning in Rome valued the natural landscape and took account for environmental factors. It was thought that by building a city with regard to the local countryside, the people living there would be healthier and happier. English landscapes would later take inspiration from Roman urban planning concepts in their own open spaces. Islamic gardens are distinctive green spaces that blend cultural, religious, and practical elements, serving as earthly representations of paradise. Typically featuring symmetrical designs, often in

5457-553: The completion of design work and environmental cleanup in 2015, the substation's cost was revised to $ 210 million because of unexpected soil contamination and the need for newer electrical equipment. The substation's construction costs are funded by Seattle City Light through regular rate increases for customers as part of their six-year Strategic Plan. The Denny Substation has an initial capacity of 50 Megavolt-ampere (MVA), and could increase to 405 MVA with future expansions. An underground distribution network directs electricity from

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5564-587: The complexity of distribution networks grew, it became economically necessary to automate supervision and control of substations from a centrally attended point, to allow overall coordination in case of emergencies and to reduce operating costs. Early efforts to remote control substations used dedicated communication wires, often run alongside power circuits. Power-line carrier , microwave radio , fiber optic cables as well as dedicated wired remote control circuits have all been applied to Supervisory Control and Data Acquisition (SCADA) for substations. The development of

5671-422: The counterpart of development, urban open space is a natural and cultural resource, synonymous with neither 'unused land' nor 'park and recreation areas'." Another defines urban open space as "land and/or water area with its surface open to the sky, consciously acquired or publicly regulated to serve conservation and urban shaping function in addition to providing recreational opportunities." In almost all instances,

5778-477: The current to back-up lines or for parallelizing circuits in case of failure. An example is the switching stations for the HVDC Inga–Shaba transmission line. A switching station may also be known as a switchyard, and these are commonly located directly adjacent to or nearby a power station . In this case the generators from the power station supply their power into the yard onto the generator bus on one side of

5885-446: The days before the distribution system became a grid . As central generation stations became larger, smaller generating plants were converted to distribution stations, receiving their energy supply from a larger plant instead of using their own generators. The first substations were connected to only one power station , where the generators were housed, and were subsidiaries of that power station. Substations may be designed and built by

5992-431: The density of vegetation. Green spaces contribute to the reduction of local heat, decreasing the overall effect of UHIs. The larger the distribution of green spaces, the bigger the area of heat reduction. Green spaces that are clustered together will have an additive heat reduction resulting in a greater decrease in temperature in the local area compared to surrounding areas. Human activity has increased air pollution in

6099-443: The effect of surface urban heat islands. Open spaces that include any type of vegetation help offset the high temperatures through the natural process of evapotranspiration. Evapotranspiration releases water into the air therefore dissipating heat. There are many elements of an urban open space that can contribute to the mitigation of urban heat islands including the type of open space (park or nature reserve), type of plant species, and

6206-416: The equipment used to monitor, control, and protect the rest of the substation equipment. It often contains protective relays, meters, breaker controls, communications, batteries, and recorders that save detailed data about substation operations, particularly when there is any unusual activity, to help reconstruct what happened after the fact. These control rooms typically are heated and air conditioned to ensure

6313-425: The frequency of current, or else convert from alternating to direct current or the reverse. Formerly rotary converters changed frequency to interconnect two systems; nowadays such substations are rare. A switching station is a substation without transformers and operating only at a single voltage level. Switching stations are sometimes used as collector and distribution stations. Sometimes they are used for switching

6420-538: The health of individuals and communities near the green space. Urban greening policies are important for revitalizing communities , reducing financial burdens of healthcare and increasing quality of life. By promoting the development of parks, green roofs, and community gardens, these policies contribute to cleaner air, mitigate urban heat effects, and create spaces for recreation and social interaction. Most policies focus on community benefits, and reducing negative effects of urban development, such as surface runoff and

6527-444: The increased temperatures. The average temperature during the day in cities can be 18-27 degrees Fahrenheit higher than in the surrounding rural regions. This is an example of one type of UHI, surface heat islands. Surface heat islands encompass the area from the ground to the top of the tree-line. It is usually higher during the day when direct sunlight reaches urban structures (often with darker materials than natural areas) including

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6634-464: The indoor and outdoor air has a large impact on their health. Schools located in urban areas have higher particulate matter than schools in rural areas. Compared with children in schools located in rural areas, children who attend schools located in industrial areas and urban cities have higher levels of urinary PAHs ( polycyclic aromatic hydrocarbons ) metabolites, which is linked to air pollution. There are two different ways that green spaces can reduce

6741-408: The jurisdiction or company, there are safety standards with minimum required clearance between different live equipment or conductors or between live metal and the ground, which often varies with higher clearance being required for higher voltages because of the greater ability to generate flashover . To this is added the necessary space for employees to work safely and vehicles to pass. Sometimes it

6848-669: The largest patch percentage of green space. Vegetation type (trees, shrubs and herbaceous layers) and lack of management (pruning, irrigation and fertilization) has been shown to affect a higher capacity to provide the ecosystem services of air purification and climate regulation within green urban spaces. The types of plants and shrubs are important because areas with large tree canopies can actually contribute to asthma and allergic sensitization. Urban areas tend to have higher temperatures than their surrounding undeveloped areas because of Urban Heat Islands , UHIs. Urban heat islands are areas with man-made infrastructure that contribute to

6955-590: The lifetime of the substation. Above ground, the grounding conductors may be steel, aluminum, or copper. They must be thick enough to carry the expected current of a fault for 1-3 seconds and remain undamaged. Substation fences, typically at least 2 metres (6 ft 7 in) in height, both protect the public from electrical hazards and also protect the substation from vandalism. Internal fences can also be incorporated to protect employees from areas that are unsafe when energized. Substations generally have switching, protection and control equipment, and transformers. In

7062-411: The low-voltage side. More typical distribution substations have a switch, one transformer, and minimal facilities on the low-voltage side. In distributed generation projects such as a wind farm or photovoltaic power station , a collector substation may be required. It resembles a distribution substation although power flow is in the opposite direction, from many wind turbines or inverters up into

7169-461: The main contributor, pavement. The other type of UHI, atmospheric heat islands, are from above the tree-line to the level in the atmosphere where the urban area no longer has an effect. This type of heat island has increased heat at night due to the release of heat from infrastructure that built up throughout the day. Green spaces within urban areas can help reduce these increased temperatures through shading and evapotranspiration. Shading comes from

7276-575: The natural environment, too. For example, people who were shown pictures of scenic, natural environments had increased brain activity in the region associated with recalling happy memories, compared to people that were shown pictures of urban landscapes. The World Health Organization considers urban green spaces as important to human health. These areas have a positive impact on mental and physical health. Urban open spaces often include trees or other shrubbery that contribute to moderating temperatures and decreasing air pollution . Perceived general health

7383-596: The open spaces surrounding the substation. The outer walls use 35-foot-high (11 m) stainless steel panels (16 feet (4.9 m) above street level) with a 1 ⁄ 4 -mile (0.40 km) elevated pedestrian ramp to provide views of the cityscape and the substation's interior. In exchange for a street vacation that eliminated a block of Pontius Avenue, the Denny Substation project is required to include public benefits. The substation has 44,000 sq ft (4,100 m) of open space located on its western side, including an off-leash area for dogs and public art. At

7490-433: The opportunity to get outside and expend energy, children are more focused in school and have a better working memory and reduced inattentiveness. Another facet of urban green space improving mental health is giving children access to a community. Recreational activities and playing at the park gives children opportunities to interact with other children and develop a social circle and social skills in general. Children with

7597-411: The outside so as to blend in with other buildings in the area. A compact substation is generally an outdoor substation built in a metal enclosure, in which each item of the electrical equipment is located very near to each other to create a relatively smaller footprint size of the substation. High-voltage circuit breakers are commonly used to interrupt the flow of current in substation equipment. At

7704-407: The page similarly to the way the apparatus would be laid out in the actual station. In a common design, incoming lines have a disconnect switch and a circuit breaker . In some cases, the lines will not have both, with either a switch or a circuit breaker being all that is considered necessary. A disconnect switch is used to provide isolation, since it cannot interrupt load current. A circuit breaker

7811-559: The park was improved. Mental illness has been a major taboo and concern in the current fast-paced world in which time to relax is undervalued.  Globally, mental illness is linked to eight million deaths each year. In urban areas , limited access to green space and poor quality of green spaces available may contribute to poor mental health outcomes; according to some studies, people living in cities and towns may have weaker mental health in comparison to people living in less crowded areas. Urban green spaces are pieces of nature in

7918-526: The period between environmental cleanup and the start of construction, the vacant lot was used for a series of temporary public art installations collectively called All Rise . Final approval for the project was granted in August 2015 by the Seattle City Council , who also approved the substation's unconventional design incorporating public benefits in exchange for a street vacation. Walsh Construction

8025-413: The pollution of particulate matter including preventing distribution of particulate from pollutants or by reducing the particulate matter from traveling to other places. There is a disagreement about the association of living near green spaces or having high exposure to greenness and illness such as allergies, rhinitis, and eye and nose symptoms. Higher exposure to tree canopy and pollen was associated with

8132-557: The prospect of living in less green residential environments, especially people from low economic strata. This may cause environmental inequality with regard to the distribution of (access) to public green space. The parks that do exist in minority neighborhoods are often small (with lower acreage per person than parks in majority ethnicity neighborhoods), not well maintained, unsafe, or are otherwise ill-suited for community needs. A large epidemiological study. concluded that wealthier individuals were generally healthier than individuals with

8239-661: The public grid. Sometimes they are also transmission substations or collector substations if the railway network also operates its own grid and generators to supply the other stations. A mobile substation is a substation on wheels, containing a transformer, breakers and buswork mounted on a self-contained semi-trailer , meant to be pulled by a truck . They are designed to be compact for travel on public roads, and are used for temporary backup in times of natural disaster or war . Mobile substations are usually rated much lower than permanent installations, and may be built in several units to meet road travel limitations. Substation design

8346-407: The public, these spaces began to be re-designated as private parks around the late eighteenth century. It was during this period that the areas became pockets of green in the urban environment, commonly modelled after the natural wild of the countryside. The first parks to reverse the trend of privatization and again be opened to the public were England's royal parks in the nineteenth century. This

8453-495: The public, urban green spaces are sometimes privately owned, such as higher education campuses , neighborhood/community parks/gardens , and institutional or corporate grounds. Areas outside city boundaries, such as state and national parks as well as open space in the countryside, are not considered urban open space. Streets, piazzas , plazas and urban squares are not always defined as urban open space in land use planning. Urban green spaces have wide-reaching positive impacts on

8560-411: The reliable operation of this equipment. Additional equipment is necessary to handle power surges associated with intermittent renewable energy such as dispersed generation from wind or solar. Most transformers lose between 5 and 1.5 percent of their input as heat and noise. Iron losses are no-load and constant whenever the transformer is energized, while copper and auxiliary losses are proportionate to

8667-605: The risks of chronic disease and mental illness. Individuals and families who lived closer to ‘formal’ parks or open space were more likely to achieve the recommended amounts of physical activity. Better respiratory health is associated with cleaner air quality. Cleaner air quality affects rates of chronic disease in populations exposed. “High concentrations of ambient particles can trigger the onset of acute myocardial infarction and increase hospitalization for cardiovascular disease”. Besides an association with lower BMI/obesity rates, this physical activity can increase lung function and be

8774-509: The segmentation of the spaces, displays a situation similar to the privatization of London parks in the eighteenth century, which displayed a desire to make classes more distinct. In the 20th century, places like Scandinavia saw a proliferation of urban open spaces and began adopting a lifestyle supported by the extra urban breathing room. An example of this can be seen in Copenhagen where an area closed to car traffic in 1962 developed, in just

8881-555: The so-called smart grid . Urban open space In land-use planning , urban green spaces are open-space areas reserved for parks and other "green spaces", including plant life , water features – also referred to as blue spaces – and other kinds of natural environment. Most urban open spaces are green spaces, but occasionally include other kinds of open areas. The landscape of urban open spaces can range from playing fields , to highly maintained environments, to relatively natural landscapes . Generally considered open to

8988-437: The southeast corner of the facility is a community space with a gallery space , exhibit hall, a small theater , and an educational center known as the "Energy Inspiration Center". A King County Metro bus stop on Denny Way will be integrated into the substation, with enhanced shelters and real-time arrival information . A sound art installation was placed in a nearby alley, projecting the noise of rushing water in reference to

9095-775: The space referred to by the term is green space, focused on natural areas. The spaces that are part of "public space" are broadly construed, including meeting or gathering places that exist outside the home and workplace. These foster resident interaction and opportunities for contact and proximity. This definition implies a higher level of community interaction and places a focus on public involvement rather than public ownership or stewardship. The benefits that urban open space provides to citizens can be broken into four basic forms: recreation , ecology, aesthetic value, and positive health impacts. Psychological research shows that benefits gained by visitors to urban green spaces increased with their biodiversity, indicating that "green" alone

9202-430: The square of the current. Auxiliary losses are due to running fans and pumps which is noisy when the transformer is operating at maximum capacity. To reduce noise, enclosures are often built around the transformer and can also be added after the substation is built. Oil-based transformers are often built with bunded areas to prevent the escape of flaming or leaking oil. Fire separation areas or firewalls are built around

9309-451: The substation must be considered, such as drainage , noise and road traffic effects. The substation site must be reasonably central to the distribution area to be served. The site must be secure from intrusion by passers-by, both to protect people from injury by electric shock or arcs, and to protect the electrical system from misoperation due to vandalism. If not owned and operated by a utility company, substations are typically occupied on

9416-400: The substation running quickly. Prefabrication is a common way to reduce the construction cost. For connecting the new substation, a partial outage at another substation may be required, but the utility often tries to minimize downtime. Substations typically serve at least one of the following purposes: A transmission substation connects two or more transmission lines. The simplest case

9523-621: The substation to the Denny Triangle and South Lake Union neighborhoods. The substation is planned to be connected to the Massachusetts Substation in SoDo via a 115- kilovolt (kV) transmission line through Downtown Seattle. The use of a gas-insulated switchgear in the Denny Substation allowed for a smaller footprint; the facility also uses solar cells to produce its electricity and a heat recovery system . Outside consultants hired by

9630-454: The substation where electrical energy is being converted to heat, which indicates a problem and can cause additional damage from the high heat. Dissolved gas analysis can tell when an oil-insulated transformer needs to have the oil filtered or replace, and also detect other issues. Early electrical substations required manual switching or adjustment of equipment, and manual collection of data for load, energy consumption, and abnormal events. As

9737-554: The switching station is to isolate the faulty portion of the system in the shortest possible time. De-energizing faulty equipment protects it from further damage, and isolating a fault helps keep the rest of the electrical grid operating with stability. Electrified railways also use substations, often distribution substations. In some cases a conversion of the current type takes place, commonly with rectifiers for direct current (DC) trains, or rotary converters for trains using alternating current (AC) at frequencies other than that of

9844-436: The system. Capacitors can reduce the current in wires, helping stem system losses from voltage drop or enabling extra power to be sent through the conductors. Capacitors may be left on in response to constant inductive load or turned on when inductive load is increased, such as in the summer for air conditioners . The switching may be remote and can be done manually or automatically. Larger substations have control rooms for

9951-410: The taller plants, such as trees, planted in green spaces that can contribute to lowering the surface heat island effect. The shade provides protection from the sun for vulnerable populations, such as children, during periods of increased temperature, during the summer months or during a heat wave. Tree cover prevents some solar radiation from reaching the ground with its leaves and branches. This reduces

10058-466: The time of interruption, current could be normal, too high due to excessive load, unusual due to a fault, or tripped by protective relays prior to anticipated trouble. The most common technologies to extinguish the power arc from separating the conductors in the breaker include: Reclosers are similar to breakers, and can be cheaper because they do not require separate protective relays. Often used in distribution, they often are programmed to trip when

10165-429: The transformer to stop the spread of fire. Firefighting vehicles are allowed a path to access the area. Maintenance of substations involves inspections, data collection and analysis, and routine scheduled work. Using methods such as infrared scanning and dissolved gas analysis, it can be predicted when the substation will need maintenance and predict dangers before they materialize. Infrared technology finds hot spots in

10272-707: The transmission grid. Usually for economy of construction the collector system operates around 35 kV, although some collector systems are 12 kV, and the collector substation steps up voltage to a transmission voltage for the grid. The collector substation can also provide power factor correction if it is needed, metering, and control of the wind farm. In some special cases a collector substation can also contain an HVDC converter station. Collector substations also exist where multiple thermal or hydroelectric power plants of comparable output power are in proximity. Examples for such substations are Brauweiler in Germany and Hradec in

10379-401: The transmission or distribution systems. Distribution substations are typically the points of voltage regulation , although on long distribution circuits (of several miles/kilometers), voltage regulation equipment may also be installed along the line. The downtown areas of large cities feature complicated distribution substations, with high-voltage switching, and switching and backup systems on

10486-454: The transmission system to the distribution system of an area. It is uneconomical to directly connect electricity consumers to the main transmission network, unless they use large amounts of power, so the distribution station reduces voltage to a level suitable for local distribution. The input for a distribution substation is typically at least two transmission or sub-transmission lines. Input voltage may be, for example, 115 kV, or whatever

10593-457: The use of urban green rings. Segmentation of urban open spaces was particularly prominent in America during the twentieth century. Since the late 1800s romantic park systems, open space designers have been concerned with guiding, containing or separating urban growth, distributing recreation, and/or producing scenic amenity, mostly within the framework of geometric abstractions." Such segmentation

10700-513: The value of "substituting gray infrastructure." One researcher states how attractive neighborhoods contribute to positive attitudes and social norms that encourage walking and community values. Properties near urban open space tend to have a higher value. One study was able to demonstrate that, "a pleasant view can lead to a considerable increase in house price, particularly if the house overlooks water (8–10%) or open space (6–12%)." Certain benefits may be derived from exposure to virtual versions of

10807-434: The world's population being located in urban locations. As the population continues to grow, this number is predicted to be at two-thirds of people living in urban areas by 2050. The World Health Organization (WHO) defined urban green spaces as "all urban land covered by vegetation of any kind". When doing research, some experts use "urban open space" to describe a broader range of open areas. One definition holds that "As

10914-462: The yard, and the transmission lines take their power from a Feeder Bus on the other side of the yard. An important function performed by a substation is switching , which is the connecting and disconnecting of transmission lines or other components to and from the system. Switching events may be planned or unplanned. A transmission line or other component may need to be de-energized for maintenance or for new construction, for example, adding or removing

11021-547: Was a manufacturing district whose electrical power was supplied by the Broad Street Substation. After the failure of the Seattle Commons plan in the 1990s, which proposed a large city park over the neighborhood, the land was opened for development by Paul Allen 's Vulcan Real Estate , which envisioned it as a hub for biotech and high tech firms. Vulcan and Seattle City Light began talks of collaborating to build

11128-514: Was awarded the construction contract for the substation project, working alongside subcontractors Valley Electric, W.A. Chester and Transcon. Construction of the substation began in May 2016, and by the end of the year, the first outer walls were erected. The substation's three transformers , each weighing 6.5 short tons (5,900 kg), were installed in 2017. The Denny Substation was energized in April 2018 and

11235-511: Was done in response to the extensive and unexpected population movement from the country into cities. As a result, "the need for open space was socially and politically pressing… The problems, to which the provision of parks was expected to offer some relief, were easy to describe: overcrowding, poverty, squalor, ill-health, lack of morals and morale, and so on". China's Fourteenth Five-Year Plan's plan 's Climate Change Special Plan emphasizes ecologically-oriented urban planning , including through

11342-455: Was especially prominent in the 1990s, when urban open spaces took a path similar to that of parks, following the modernization trend of segmentation and specialization of areas. As modernity stressed "increased efficiency, quantifiability, predictability, and control… In concert with the additional social divisions", open spaces grew more specific in purpose. Perhaps this increase in division of social classes ' use of open space, demonstrated by

11449-449: Was formally opened in October, becoming the first new substation built by Seattle City Light in 30 years. Construction of the substation required long-term closures of a westbound lane on Denny Way and postponed the installation of a bus lane on the street. A formal opening ceremony was held on July 20, 2019, with remarks from city leaders and events sponsored by local businesses. The substation began supplying electricity later that year and

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