Category Archive for: «Power Substation»

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Basic Stand-Alone Application of Reclosers

Overcurrent protection Reclosers are self-contained fault interrupting and reclosing devices, specifically designed for overcurrent protection in secondary distribution systems. Reclosers are situated in selected locations within the overhead distribution network. With the correct protection setting and MV fuse selection coordination, concerning the whole supply loop from the supplying primary distribution substation feeder to the fuse-protected […]

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Configurations and Characteristics Of Distribution Substations

Small, medium, and large substations Distribution substations come in many sizes and configurations. A small rural substation may have a nominal rating of 5 MVA while an urban station may be over 200 MVA. Figures 1 through 3 show examples of small, medium, and large substations. As much as possible, many utilities have standardized substation […]

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Important Primary Distribution (Radial and Loop) System Considerations

Primary (distribution) feeders // The primary distribution system is that part of the electric distribution system between the distribution substation and distribution transformers. It is made up of circuits called primary feeders or distribution feeders. These feeders include the primary feeder main or main feeder, usually a three-phase, four-wire circuit, and branches or laterals, which […]

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6 Transformer Types You Can See In Commercial Installations

Transformer Types and their Characteristics Transformers in commercial installations are normally used to change a voltage level from a utility distribution voltage to a voltage that is usable within the building, and are also used to reduce building distribution voltage to a level that can be utilized by specific equipment. Applicable standards are the ANSI […]

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How can I select the right capacitors for my specific application needs?

Power factor correction Once you’ve decided that your facility can benefit from power factor correction, you’ll need to choose the optimum type, size, and number of capacitors for your plant. Individual vs. banked installations 7 advantages of individual capacitors at the load: Complete control // Capacitors cannot cause problems on the line during light load conditions […]

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Ring Main Unit (RMU) as an important part of secondary distribution substations

RMU A Ring Main Unit (RMU) is a totally sealed, gas-insulated compact switchgear unit. The primary switching devices can be either switch disconnectors or fused switch disconnectors or circuit breakers. Different combinations of these primary switching devices within the unit are commonly used. In case a circuit breaker is the switching device, it is also […]

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Main and Transfer (Inspection) Bus Arrangement commonly used in AIS

For low reliability requirement situations The main and transfer bus configuration connects all circuits between the main bus and a transfer bus (sometimes referred to as an inspection bus). Some arrangements include a bus tie breaker and others simply utilize switches for the tie between the two buses. This configuration is similar to the single […]

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Site selection considerations for the future power substation

Final location of the facility At this stage, a footprint of the future power substation should be developed, including the layout of the major equipment. A decision on the final location of the facility can now be made and various options can be evaluated. Final grades, roadways, storm water retention, and environmental issues are addressed at […]

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Satellite communication for remote control and monitoring of substations

Application for substation automation Substation Automation is a supervisory management and control system that lies in between transmission and distribution systems. The interests on substation automation have been increasing rapidly due to its numerous benefits to utilities. It has advanced further than a traditional Supervisory Control and Data Acquisition (SCADA) system providing additional capability and […]

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What engineers should know about using conduits in power substation designs

Design challenges There are several locations where conduit is used in power substation designs. The most common one considered is conduit used to provide cable access to equipment, such as breakers, transformers, instrument transformers, and motor-operated disconnect switches located in the yard of the substation. Conduit can be a means by which direct buried cable […]

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