A method for measuring winding temperature of transformer

Abstract

The invention discloses a winding temperature measuring method for a transformer. The method includes the steps of 1) collecting the rated current corresponding to every scale of the transformer and performing fitting with a linear equation shown by formula (1) for obtaining linear proportionality coefficients a and b according to the rated current corresponding to every scale of the transformer; 2) collecting the top oil temperature, the high voltage side load current and the current operation scale of the transformer; 3) determining the cooling coefficient m and the winding temperature calculating constant A and B of the transformer according to the cooling mode of the transformer; 4) calculating the winding temperature T of the transformer according to the formula (2). According to the winding temperature measuring method for the transformer, the top oil temperature, the high voltage side load current and the current operation scale of the transformer are collected for simulating to calculate the winding temperature of the transformer on the basis of an automated monitoring system of the transformer, the calculation of the winding temperature is accurate and reliable, a field winding temperature meter can be omitted, the winding temperature failure rate can be decreased, and the maintenance workload and difficulty can be reduced.

Description

technical field [0001] The invention relates to the technical field of transformer safety monitoring, in particular to a method for measuring winding temperature of a transformer. Background technique [0002] The winding temperature is the basis for the safe operation of the transformer, so it is necessary to monitor the winding temperature of the transformer in real time during the operation of the transformer. The BWR-04 winding thermostat used in the power system is a special instrument specially designed for oil-immersed power transformers. Transformer winding temperature T1 is the sum of transformer top layer oil temperature T2 and winding temperature rise △T to oil (ie T1=T2+△T), where the temperature rise △T of winding to oil is determined by transformer winding current, current transformer The secondary side current is proportional to the winding current; the working principle of the winding thermostat is to use the "thermal simulation" method to indirectly measure...

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Problems solved by technology

The controller is generally composed of a controller, a matching device, and a secondary instrument. The cost is relatively high, but the actual application is less, and it is generally not connected to the non-electric control circuit, and because the mechanical part is easy to rust, the potentiometer in the controller is easily damaged. , the meter structure is complex, expensive, and difficult to repair, which seriously affects the local meter indication and the temperature display of the monitoring system

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