Line current differential protection method capable of preventing influences of both transitional resistance and load current
A technology of load current and line current, applied in the direction of automatic disconnection emergency protection devices, circuit devices, emergency protection circuit devices, etc., can solve the problem of large capacitive current, failure to isolate the faulty line from the grid, and insufficient sensitivity of protection actions, etc. question
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[0013] The technical solution of the present invention will be further described in detail according to the accompanying drawings.
[0014] figure 1 It is a schematic diagram of a line transmission system applying the method of the present invention. figure 1 The CT in is the current transformer. The current differential protection device using the method of the present invention measures the three-phase current at the protection installation place of the transmission line m substation and transmission line n substation protection installation for three-phase current Among them, the transmission line connects substation m and substation n.
[0015] Protection device calculation and judgment | I · mA | min { | I · ...
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