Iron core grounding monitoring method and system for power transformer

Abstract

The invention discloses an iron core grounding monitoring method and system for a power transformer. The method includes: a monitoring substation collects current signals of a power transformer iron core and a clamping element, range conversion processing and sampling processing are carried out on the current signals to obtain measurement results, and the measurement results are sent to an upper computer management system through a wireless communication module; and the upper computer management receives the measurement results and displays the measurement results, so that the operator determines whether multi-point grounding occurs at the power transformer iron core based on the measurement results. The monitoring substation carries out range conversion processing on the current signals;conversion of ranges from the milliampere level to dozens of amperes is realized automatically; and a phenomenon of measuring the milliampere-level current by using a large range is avoided, so that the resolution and precision of the measurement results are improved and thus the measurement results have high reliability. The upper computer management displays the measurement results in real time,so that the operator is able to carry out monitoring timely in a central control room.

Description

technical field [0001] The invention relates to the technical field of monitoring and control, in particular to a method and system for monitoring the grounding of a power transformer iron core. Background technique [0002] The power transformer is one of the key equipment in the power system. Its normal operation is an important guarantee for the safe and reliable operation of the power system. The power transformer core is the main component for transmitting and transforming electromagnetic energy, ensuring its safety and the normal operation of the power transformer. the key to. The iron core of the power transformer is reliably grounded at one point outside the oil tank through the bushing. If the iron core is grounded at other points for some reason, it will cause circulating current, cause local overheating of the iron core, and cause the insulation oil to decompose, resulting in a decline in insulation performance. In severe cases , It will burn out the iron core an...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a power transformer core grounding monitoring method and system to solve the problem of timely and reliable monitoring of the power transformer core grounding condition

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