Method for judging and protecting low voltage in transformer short circuit fault
A short-circuit fault, low-voltage technology, applied in emergency protection circuit devices, instruments, measuring electricity and other directions, can solve the problems of low sensitivity, complex hardware, and many channels of traditional solutions, and achieve high action sensitivity, simple hardware, and few channels. Effect
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Embodiment 1
[0025] The steps of identifying low voltage in transformer short circuit fault are as follows:
[0026] (1) Protection device measurement Three-phase phase voltage of the high voltage side (Y side) of the wiring transformer ;
[0027] (2) The protection device calculates the modulus of the Y-side line voltage: , , , The modulus of the Y-side phase voltage: =| |, =| |, =| |;
[0028] (3) Put , , , , , Six low voltage start criteria , , , , , ,among them Is the setting value, and then forms an "OR" gate output, when any of the six low voltages is less than the setting value If the criterion is met, the output level is "1", such as figure 1 Shown.
[0029] transformer side (AB two-phase short circuit), the fault point ; side (BC two-phase short circuit), ; side (CA two-phase short circuit), ; Because there must be a line voltage of zero, the low voltage start sensitivity is very high.
[0030] Transformer delta side outlet (AB two-phase short ci...
Embodiment 2
[0036] The steps to determine the low-voltage protection method in the transformer short-circuit fault are as follows:
[0037] (1) Protection device measurement Three-phase phase voltage of the high voltage side (Y side) of the wiring transformer ;
[0038] (2) The protection device calculates the modulus of the Y-side line voltage: , , , The modulus of the Y-side phase voltage: =| |, =| |, =| |;
[0039] (3) Put , , , , , Six low voltage start criteria , , , , , ,among them Is the setting value, and then forms an "OR" gate output, when any of the six low voltages is less than the setting value If the criterion is met, the output level is "1";
[0040] (4) The six “OR” gate outputs of the above six low-voltage start criteria and the over-current criteria form the “AND” gate delay outlet to trip the circuit breaker, such as figure 2 As shown, the low-voltage start-up of the transformer or the composite voltage start-up overcurrent protection ca...
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