Method for improving main transformer remote-reading thermometer accuracy and remote-reading thermometer

Abstract

The invention relates to a method for improving main transformer remote-reading thermometer accuracy and a remote-reading thermometer, and belongs to the technical field of power supply devices. The remote-reading thermometer comprises a temperature-sensing probe (1), a temperature transmitter (2), a temperature displayer (3) and a centralized control station (4). The temperature-sensing probe is installed on an upper cover of a main transformer (5), an output end of the temperature-sensing probe is connected with the temperature transmitter, and an output end of the temperature transmitter is respectively connected with the temperature displayer and the centralized control station. According to the method for improving the main transformer remote-reading thermometer accuracy and the remote-reading thermometer, the insertion depth of the temperature-sensing probe can reach more than 120mm, and therefore the remote-reading thermometer can reflect the real temperature of the transformer correctly and reduce errors caused by insufficient insertion depth of the temperature-sensing probe; and in the process of four-wire system wiring, according to the double-bridge measuring circuit principle, conductor resistance has no effect on measuring results, measurement accuracy is high (contact resistance is ignored), the main transformer remote-reading temperature measurement accuracy is improved, display errors of the remote-reading thermometer and a computer terminal can be controlled within a required range, and problems existing in production in a long term are solved.

Description

technical field [0001] The invention relates to a method for improving the accuracy of a main transformer remote transmission thermometer and a special remote transmission thermometer, belonging to the technical field of power supply equipment. Background technique [0002] The power transformer is one of the important electrical equipment in the power system, and its operating status has a great relationship with the safe and reliable operation of the power system. According to relevant statistics, the average accident rate of 110kV and above transformers during 1990-1999 was about 0.69%. Among them, due to the over-temperature operation of the winding, the insulation aging is caused, and the transformer winding breakdown and burning accidents account for a considerable proportion. For oil-immersed transformers, its life is actually mainly the life of solid insulation (fiber paper). The main factors that promote insulation aging are temperature, moisture and oxygen, among...

AI Technical Summary

Problems solved by technology

Background Art The accuracy of temperature measurement cannot be guaranteed. Through on-site inspection, the difference between the indicated value of the temperature gauge on the body of the same main transformer and the value displayed on the remote thermometer is very large, reaching 10 O C

(The regulations stipulate that no more than 5 O C), after verification, it is found that the remote thermometer shows a large error

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