Grounding line selection device
A technology for grounding line selection and grounding terminals, which is applied in the field of line selection devices, can solve problems such as large leftovers, re-ignition of fault points, and strong transient currents, so as to avoid the risk of two-phase short-circuit grounding, reduce volume and manufacture The cost and the effect of avoiding the occurrence of transient current
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[0018] The preferred modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0019] see figure 1 , the composition of the grounding line selection device is as follows:
[0020] There are three branches connected in series between the bus terminal A-B-C and the ground terminal D via the bus isolating switch A0: the ground transformer branch, the soft switch branch and the voltage detection branch. in,
[0021] The grounding variable branch is composed of a three-phase synchronous operation switch K3, a grounding transformer B, a current limiting resistor R2 and a first current sensor CT1 connected in series; the control terminal of the three-phase synchronous operation switch K3 is electrically connected to the controller KZQ, and the first The secondary side of a current sensor CT1 is electrically connected to the input terminal of the controller KZQ.
[0022] The soft switch branch is composed of phase-spli...
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