High voltage direct current power transmission line protection method based on voltage and current mutation direction
A transmission line, high-voltage DC technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of multiple operation modes, sampling frequencies, communication channels and hardware requirements of the DC transmission system that are not discussed, and achieve a simple and clear protection method. , Fast and accurate action, high practical value effect
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[0044] The present invention will be further described below in conjunction with accompanying drawing.
[0045] Such as figure 1 Shown is the structure diagram of the applicable bipolar direct current transmission system of the present invention, and the implementation steps of the protection method are as follows:
[0046] Step 1: Analyze the direction characteristics of voltage and current mutations at the installation place of DC transmission line protection:
[0047]At the moment of failure, that is, in the transient process where the control system does not start or the control system starts to adjust but has not yet adjusted to a steady state:
[0048] 1) When an internal fault occurs on the positive or negative line, the direction of the voltage mutation at the protection measurement point on the rectifier side of the line is opposite to the direction of the current mutation, and the directions of the two on the inverter side are the same.
[0049] 2) When a pole-to-p...
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