
TDR9000
™
Circuit Breaker Test System User’s Guide
72A-1898 Rev. A 11/01
A-19
Monday
, November 26, 2001 1:09 pm
Gang Operation vs. Independent Pole Operation
Gang operation is a term used for a circuit breaker mechanism that
operates all three poles together.
As the voltage level increases, the separation between the phases also
increases in order to maintain the necessary distance for dielectric
strength. It is very difficult using gang operation to maintain contact
synchronism. The length and the mass of the interconnecting rod also
becomes a problem. Therefore, multiple single pole operators are used in
most circuit breakers above 345 kV.
When a high voltage circuit breaker consisting of three single pole
operators is used (Independent Pole Operation), it is necessary to employ
a phase disagreement circuit to eliminate the possibility of having one or
more phases closed while one or more phases are open.
Single phase tripping and reclosing for single phase-to-ground faults may
be used in a circuit breaker with Independent Pole Operation. Power can
be transmitted in the two unfaulted phases, while the third phase
interrupts the fault and then recloses to restore the circuit. If the reclosing
is not successful, the other two phases must be opened. This scheme may
aid in maintaining system synchronism and stability in addition to
maintaining power flow.
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