Method for carrying out inductive withstand voltage and partial discharge tests of high voltage shunt reactors by using line

Abstract

The invention discloses a method for carrying out inductive voltage withstanding and partial discharge tests of high voltage shunt reactors by using a line, and the method employs the ground capacitance of an overhead line or a cable line connected with the high voltage shunt reactors as a compensation capacitor, and achieves the induction voltage withstanding test and the partial discharge test of the shunt reactors. The method has the advantages that the existing equipment is directly used for carrying out voltage withstanding and partial discharge tests on the high voltage shunt reactors; the test system investment is low, and the test can be carried out only by a variable-frequency power supply and a partial voltage measurement system, meanwhile, on-site wiring is convenient, and hoisting of a large-scale compensation capacitor is not needed. According to the test method, the workload of a resonance test by adopting a compensation capacitor traditionally is greatly reduced, the test time is effectively shortened, and the test method has great advantages for a project with a short construction period.

Description

technical field [0001] The invention belongs to the technical field of partial discharge test, and in particular relates to a method for conducting high resistance to induction withstand voltage and partial discharge test by using a line. Background technique [0002] When the transmission line is unloaded, due to the existence of line capacitance, the power supply side will transmit charging current to the line. The existence of this charging current will increase the power frequency voltage at the end of the line, that is, the capacity rise effect. At present, the voltage level in the power system is relatively high, and the length Longer lines usually install shunt reactors at one or both ends to reduce the capacity rise effect. [0003] According to the relevant regulations in GB / T 1094.6, the insulation test of shunt reactor includes externally applied withstand voltage test, induced withstand voltage test, lightning impulse test and operation impulse test. Among them,...

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Problems solved by technology

Externally applied withstand voltage cannot assess the inter-turn insulation level of the reactor

In addition, the test voltage level of the externally applied withstand voltage is limited by the neutral point withstand level of the reactor, which cannot reach the voltage required for the partial discharge test of the reactor

[0005] The on-site reactor induction withstand voltage test needs to be equipped with a large-capacity capacitor bank according to the reactor. The investment in this equipment is huge, and the volume and weight of the equipment are relatively high. The layout and wiring of the on-site test circuit are relatively heavy.

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