Pumping high-impedance protection configuration method of pumping winding delta-type wiring

Abstract

The invention relates to a pumping high-impedance protection configuration method of pumping winding delta-type wiring. The configuration method comprises: differential protection, zero-sequence differential protection, and inter-turn protection are configured to be main protection of a main electric reactor; master reactor over-current protection, overload protection and zero-sequence over-current protection are configured to be backup protection of the main electric reactor; neutral-point reactor over-current and overload protection are configured to be protection of a neutral-point reactor;and pumping zero-sequence over-current protection is configured to be inter-turn protection of a pumping winding and pumping turning re-pressing over-current protection is configured to be backup protection of a pumping winding. According to the pumping high-impedance protection configuration method, while the main reactor is protected, the inter-turn short-circuit fault and phase-to-phase shortcircuit fault of the pumping winding can be reflected sensitively and reliably. Therefore, a technical problem that the conventional protection configuration can not reflect the inter-turn short-circuit fault sensitively of pumping when the pumping winding is in a triangular wiring mode can be solved; the action characteristic of protection is improved; and the pumping high-impedance protection configuration method has the great engineering application value.

Description

technical field [0001] The invention belongs to the field of relay protection for electric power systems, and more specifically relates to a configuration scheme for pumping high-resistance protection for △-type wiring of pumping windings. Background technique [0002] The working principle of the high-voltage pumped-energy shunt reactor is that while the high-voltage shunt reactance compensates the capacitive reactive power of the line, two cables are drawn from the high-resistance pumped winding of each phase to the high-voltage side of the transformer used as the main source of power for the switch station. Power supply to provide lighting or other domestic electricity for switch stations, which can save a lot of investment in engineering projects. Since the high-voltage reactor is directly connected to the high-voltage line, and the pumping winding is the auxiliary winding of the reactor, when a short circuit occurs on the pumping winding and its lead-out line, the high-...

AI Technical Summary

Problems solved by technology

The analysis of the Y and △ connection modes of the energy extraction winding shows that when the energy extraction winding is Y-connected, this protection configuration can respond to the turn-to-turn short circuit and phase-to-phase short circuit faults of the energy extraction winding system; when the energy extraction winding is Δ connection, Inter-turn short-circuit fault occurs in the energy pumping winding, the short-circuit current can be equivalent to the zero-sequence current of the three phases with the same size and the same direction, forming a circulating current in the Δ-type winding, this protection configuration scheme cannot respond sensitively to the inter-turn short-circuit fault of the energy pumping winding

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