Capacitor capacitance on-line testing device

Abstract

The invention discloses a capacitor capacitance on-line testing device which comprises testing equipment, the number of the testing equipment is the same as that of capacitor branches in a parallel capacitor bank, and the testing equipment is communicated with each capacitor branch in the parallel capacitor bank and used for collecting terminal voltage and current of a capacitor and monitoring the capacitance of the capacitor. Each testing device comprises a tester, a current transformer and a discharge coil, the tester is connected with the discharge coil installed at the two ends of one branch capacitor of the parallel capacitor bank and the current transformer connected to the wire outlet end of the branch capacitor in a sleeving mode, and the terminal voltage and the current of the capacitor are collected through the current transformer and the discharge coil respectively; the tester comprises an acquisition module, an alarm module, a control module and a power supply module. The capacitance of the capacitor is measured under the condition that personal safety is guaranteed, the capacitance is compared with historical data, the operation condition of the capacitor is determined, and a capacitor equipment abnormity warning signal is sent out when the condition is abnormal.

Description

Technical field: [0001] The invention relates to the field of maintenance of power transformation equipment, in particular to an on-line testing device for capacitor capacitance. Background technique: [0002] The capacitor bank is an important part of the power system. It is used to compensate the inductive reactive power in the power system to improve the power factor of the power grid, reduce the line loss, and improve the transmission capacity of the line. It plays an important role in improving the quality of voltage and power. Due to the use of nonlinear equipment in the power system, there are a large number of odd harmonics. If the capacitance of the capacitor and the inductance of the reactor are not matched properly, it will cause overcurrent in the capacitor and reduce the service life of the capacitor. [0003] At present, when the capacitor needs to be measured for equipment maintenance, the capacitor needs to be disconnected from the system. The operation is cu...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, to provide an on-line test device for capacitor capacitance without power failure and disconnection, which solves the problem of low efficiency of the traditional measurement method and reduces the abnormality of the capacitor bank. The risk of damage to the capacitor bank due to untimely status discovery

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