19 Questions
What is the primary function of a power transformer in a substation?
To convert high-voltage power to low-voltage power and vice versa.
What is the purpose of a current transformer (CT) in a substation?
To scale down the high magnitude of current flowing in high-voltage conductors to a level safer to work with.
What is the purpose of a voltage transformer (PT) in a substation?
To scale down very high voltages to levels safer to work with.
What is the primary function of a circuit breaker in a substation?
To interrupt current flow in the line, transformer, bus, or other equipment when a problem occurs.
What is the primary purpose of a disconnect switch in a substation?
To isolate or deenergize equipment for maintenance purposes or to transfer load from one source to another.
How do capacitors improve the operating efficiency of electric power systems?
By canceling out the lagging current effects from motors and transformers.
What is the effect of capacitors on system losses in electric power systems?
Capacitors reduce system losses.
What is the role of capacitors in transmission system voltage stability?
Capacitors help provide voltage support during disturbances.
Why are instrument transformers used in substations?
To scale down actual power system quantities for metering, protective relaying, and/or system monitoring equipment.
Which substation equipment can be used to transfer load from one source to another?
Disconnect Switches
Which device is used to scale down high magnitude of current flowing in high-voltage conductors?
Current Transformers
What is the primary purpose of using capacitors in electric power systems?
To reduce system losses and provide voltage support
Which device is used to interrupt current flowing in the line, transformer, bus, or other equipment when a problem occurs?
Circuit Breakers
What is the primary purpose of using disconnect switches in substations?
To isolate or de-energize equipment for maintenance purposes
Which substation equipment is used to protect the power system from lightning strikes?
Lightning Arresters
Which device is used to convert high-voltage power to low-voltage power and vice versa?
Power Transformers
What is the effect of using capacitors on the operating efficiency of electric power systems?
It improves the operating efficiency
Which device is used to scale down very high voltages to levels that are safer to work with?
Voltage Transformers
What is the primary purpose of using instrument transformers in substations?
To scale down actual power system quantities for metering, protective relaying, and/or system monitoring equipment
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.
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.
Learn about the different types of substation equipments including power transformers, instrument transformers, and switchyard accessories. Understand their functions and applications in substation design.
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