Should Line protection trip the connected shunt reactor 1

[SMB1]

Hi everyone,

i have HV cable with shunt reactor connected through circuit breaker.

in case of line protection operation, should i trip the shunt reactor or leave it connected?

thank you,

 

[cranky108]

Depends!!
What are the effects if you do, or don't?

 

[davidbeach]

Yes, definitely; one or the other.

 

[SMB1]

thank you,

so, which one and why? any body can explain

 

[dpc]

I think they are saying that you need to provide more information on the system before a valid opinion can be offered. Does the shunt reactor have its own protection?

David Castor

http://www.cvoes.com

 

[RRaghunath]

Generally speaking, shunt reactor at the end of HV cable feeder is meant to compensate partly the capacitance of the cable and thus reduce the over voltage at the receiving end (due to Ferranti effect).
In case of EHV OHLs, the reactor is directly connected to the OHL at the receiving end (without its own circuit breaker)substation and switched along with the OHL.
Thus, there is no reason why you should be switching of the reactor CB when feeder protection operates. Let the reactor remains with the disconnected cable (I think that is the right thing to do, treat the reactor and cable as one package).

 

[SMB1]

dpc: yes, the shunt reactor has circuit breaker and it has its own protection.

raghun: the scheme that i have made is to trip the reactor breaker anytime the line protection operated as per the customer requirement.

thank you

 

[m3ntosan]

Is there a unit or non-unit protection on that underground cable?
Could the underground cable be operated with the shunt reactor switched out or there's a big voltage issue?
Is there any automation to switch in/out the shunt reactor for different voltage values? Is the shunt reactor also used to keep any generation linked to the busbar in lagging operation?
Why would you choose to link the shunt reactor directly to the underground cable and not to the busbar?

From an operational/maintenance/life expectancy viewpoint I wouldn’t play too much with CBs on reactive compensation equipments (shunt reactors, mechanically switched capacitors etc) there’s a pretty tough life for a CB to play with pure reactive currents. In some power systems there are special procedures to avoid too many operations with CBs related to reactive compensation equipments.


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