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Electrical Substation Design

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Questions and Answers

What is the primary function of a power transformer in a substation?

To scale down actual power system quantities for metering

To convert high-voltage power to low-voltage power and vice versa (correct)

To interrupt current flow in the line

To isolate or deenergize equipment for maintenance purposes

What is the purpose of a current transformer?

To scale up high magnitude of current flowing in high-voltage conductors

To measure voltage levels

To transfer load from one source to another

To scale down the high magnitude of current flowing in high-voltage conductors (correct)

What is the main function of a circuit breaker in a substation?

To scale down actual power system quantities for metering

To interrupt current flowing in the line, transformer, bus, or other equipment when a problem occurs (correct)

To cancel out the lagging current effects from motors and transformers

To improve the operating efficiency of electric power systems

What is the primary purpose of a disconnector switch in a substation?

To isolate or deenergize equipment for maintenance purposes Signup and view all the answers

What is the main function of a lightning arrester in a substation?

There is no mention of lightning arrester in the content Signup and view all the answers

What is the purpose of a voltage transformer in a substation?

To scale down very high voltages to levels that are safer to work with Signup and view all the answers

What is the main function of a capacitor bank in a substation?

To improve the operating efficiency of electric power systems and help transmission system voltage stability Signup and view all the answers

What is the effect of capacitors in electric power systems?

To reduce system losses and help provide voltage support Signup and view all the answers

Study Notes

Substation Equipments

Power transformers convert high-voltage power to low-voltage power and vice versa, allowing power to flow in both directions.

Instrument Transformers

Instrument transformers scale down actual power system quantities for metering, protective relaying, and/or system monitoring equipment.
Current transformers (CTs) scale down high-magnitude currents in high-voltage conductors to a safer level for working.
Voltage transformers (PTs) scale down very high voltages to safer levels for working.

Circuit Breakers

Circuit breakers interrupt current flow in lines, transformers, buses, or other equipment when a problem occurs and power needs to be turned off.

Disconnector Switches

Disconnector switches isolate or de-energize equipment for maintenance purposes.
Disconnector switches transfer load from one source to another.

Lightning Arresters

Lightning arresters have the same purposes as disconnect switches.

Capacitor Bank

Capacitors improve the operating efficiency of electric power systems.
Capacitors help transmission system voltage stability during disturbances.
Capacitors cancel out lagging current effects from motors and transformers.
Capacitors reduce system losses and provide voltage support.

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Description

Learn about the essential components of a substation, including power transformers and instrument transformers, and their roles in converting high-voltage power to low-voltage power.