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What are the essential differences between H.V. and L.V. switchgears?

      

What are the essential differences between H.V. and L.V. switchgears?

  

Answers


gregory
H.V. switch gears:
- Circuit breaker: Switching during normal and abnormal conditions ,
interrupt the fault currents.
- Isolators: It is disconnecting switch to disconnect the system from line parts
under no load condition.
- Earth switch: This is used to discharge the voltage on the lines to earth after
disconnecting them.
- Surge arrester: This is used to divert the high voltage surge to earth and
maintaining continuity during normal voltage.
- Current Transformer : To step down the current for measurement,
protection and control purposes.
- Potential Transformer : To step down the voltage for the purpose of
protection, measurement and control.
L.V. Switchgears:
- MCBs (Miniature Circuit Breakers): Switching OFF during abnormal
conditions to interrupt the fault current.
- Fuses: A short length wire having low melting point, connected in series with
circuit. In the event of fault, the circuit current rises abruptly and fuse wire
melts to interrupt the circuit.
- Switches: these are used to ON /OFF the power of a circuit. These are used
in power/ control circuits. The switches are specified as per voltage rating,
current rating, number of poles, duty cycle and fault interruption capacity.
gregorymasila answered the question on February 20, 2018 at 16:24


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