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09,21,2026 16 views
Busbar protection:
1. The busbar overcurrent protection of the busbar trunking can be used as busbar disconnection protection or as temporary emergency protection for the line (transformer). After the busbar overcurrent protection pressure plate is put into operation, when the current of any phase of the busbar is greater than the busbar overcurrent setting value, or the zero sequence current of the busbar is greater than the busbar zero sequence overcurrent setting value, the busbar switch will be tripped after a setting delay, and the busbar overcurrent protection will not be locked by multiple voltage.
2. The bus charging protection of the bus duct will automatically widen for 200ms and then exit after the charging protection is activated, that is, the charging protection will only be open for 200ms. At the same time, the control word will determine whether to lock the bus differential protection during this period. During the open period of charging protection, if the current of any phase of the busbar is greater than the "charging protection current setting value", the busbar switch will be tripped, and the busbar charging protection will not be locked by re voltage.
3. Bus tie dead zone fault refers to the fault occurring between the bus tie (section) circuit breaker and the bus tie (section) CT. At this time, the small differential element of the faulty bus is judged as an out of zone fault and does not operate, while the small differential element of the bus tie switch side is judged as an in zone fault and still exists after tripping off the bus. Therefore, bus tie dead zone protection is set up.
4. The bus non full phase protection of the bus duct is activated by the contact points of the bus tie switch tripping position relay KCT and the switch closing position relay KCC, and negative sequence and zero sequence currents can be used as auxiliary discrimination conditions. During operation, when the bus tie switches KCT and KCC operate simultaneously and the bus tie negative sequence current or zero sequence current is greater than the non full phase current setting value, the bus tie switch will trip after a setting delay.
