Novel arc suppression coil grounding compensation device with grounding shunt function

Abstract

The invention discloses a novel arc suppression coil grounding compensation device with a grounding shunt function, and belongs to the technical field of compensation treatment of a power system on a single-phase ground fault. The novel arc suppression coil grounding compensation device comprises a grounding transformer JDB, an arc suppression coil XL and a grounding switch, wherein the arc suppression coil XL is connected with a neutral point of the grounding transformer JDB and grounded; the grounding switch is connected with various phases of a bus of the power system and grounded; the grounding switch, the grounding transformer JDB and the arc suppression coil XL are arranged in parallel; and the arc suppression coil XL and the grounding switch are connected with an automatic control device capable of detecting bus voltage and grounded capacity current of the power system. The current of a ground fault point can be quickly compensated, shunted and transferred and a ground fault line can be accurately selected, so that safe and stable operation of a power distribution network system and the personal safety are achieved.

Description

technical field [0001] The invention relates to a novel arc-suppression coil grounding compensation device with a grounding shunt function, which belongs to the technical field of single-phase grounding fault compensation processing in a power system, and is particularly suitable for processing single-phase grounding faults in a small current grounding system of a distribution network. Background technique [0002] More than 80% of the system faults in the small current grounding system are single-phase grounding faults, so the arc suppression coil reactive power compensation device or the grounding switch shunt device will be used in the small current grounding system. [0003] The function of the arc suppression coil is that when a short circuit fault occurs in a single phase of the power grid, the fault point flows through a capacitive current, and the arc suppression coil provides inductive current for compensation, and the current at the fault point drops below 10A. The...

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Problems solved by technology

In addition, since the neutral point of the system is not grounded, only the neutral point of the voltage transformer PT is grounded, and the charge stored in the ground capacitance of the system can only leak through the voltage transformer PT. After the fault disappears and the fault phase exits, it is easy to cause the resonance of the voltage transformer PT.

[0006] In the traditional power system operated by transfer grounding mode, when a ground fault occurs, the fault phase is grounded by the switch, and when the fault phase changes and other reasons cause the phase to be grounded again, the fault point and the transfer ground point will be short-circuited indirectly, thus Line trip accidents occur, which reduces the reliability of power supply; the effect is not ideal for instantaneous and intermittent arc ground faults

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