Voltage quick break protection
When a short circuit fault occurs on the line, the bus voltage drops sharply. When the voltage drops to the setting value of voltage protection, the low voltage relay acts to open the circuit breaker and remove the fault instantaneously. This is called voltage quick-break protection.
Two, current flow rate break protection
Current instantaneous electric fault protection can be divided into no time limit velocity and time limit current instantaneous break, when the line fault occurs, all the speed limit is broken can protect the instantaneous motion, but part of it can only be line, take time current instantaneous fault protection can protect the whole line with the speed limit is broken protect other than at the next lower level line without time limit protection, poor a time limit for a so a line head end under short circuit occurs, Protection against misoperation.
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