Protection Functions
196 PRS-7367
Busbar Operation Trip Adjacent CB BO
3.40.2 Protection Principle
The protection operates still does not return after 0.2s, indicating that the fault is outside the bus
protection area, but the related protection refuses to trip, so the bus protection action needs to be
removed to isolate the fault. Therefore, the Block busbar protection will automatically return and
recover the Block exit after 0.2s of operation.
Blk1
Cur_Blk
&
&
BusBlk
200ms
T
BusOp
Blk2
BlkBus_Ena Softswitch
&
BusOp
T is time delay setting
BlkBus_Ena Set
BusOp Trip
Adjacent CB
100ms
Figure 3.40-1 Common Block Busbar Protection
Block Busbar protection is a general component, which can be applied to feeder, section and main
transformer protection device respectively by configuring corresponding setting value, softswitch,
starting, action and locking conditions. Configuration examples are as follows:
1) When used as feeder protection, connect the "over-current operation" to the terminal of "Block
Busbar trip". Block 1, 2 and Block Busbar Operation will not be used by default. The logic can be
simplified as follows:
OC Str
&
Feeder Busbar Block
200ms
BlkBus Ena Softswitch
&
OC Op
BlkBus Ena Set
Figure 3.40-2 Feeder Block Busbar Protection
2) When the main transformer protection is used, Block Busbar protection is usually configured in
the main transformer 1 and the main transformer 2 respectively. Take the main transformer 1 as an
example, Block 1 is used as the Busbar1 overcurrent block, Block 2 is not used by default, or is
used for another Block conditions. For output, take the Block Busbar trip terminal trip to be low,
take the adjacent sides of the Block Busbar trip to be low failure or dead zone trip, and the logical
configuration is:
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