Method for distinguishing shutting of +/-800 kV extra-high voltage direct-current valve group
A discrimination method and DC valve technology, applied in the circuit breaker test and other directions, can solve the problem that there is no better solution for the blocking discrimination method of the DC transmission system valve group, and achieve the effect of accurate and reliable discrimination.
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[0034] Each of the two poles of the 800kV DC transmission system is composed of two 400kV valve groups in series, and each valve group corresponds to two converter transformers, so four valve groups correspond to four converter transformers. figure 1 The block-out judgment logic of the DC valve group shown in the present invention uses the full stability control device of the present invention to access the three-phase current and voltage of four converter transformers, as well as the operation and shutdown status of the DC valve group and the emergency shutdown signal of the DC valve group Wait for the switching value.
[0035] figure 1 A specific embodiment of the mutation initiation element shown in is as follows:
[0036] The device uses digital sampling to collect the three-phase current and three-phase voltage of the converter transformer. The sampling rate is 1200 points / second, and the cycle (20ms) samples 24 points. The device calculates the three-phase current value...
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