Multipath temperature detection protection method for oil-immersed transformer

Abstract

The invention relates to a multipath temperature detection protection method for an oil-immersed transformer. According to the method, a transformer transformer oil tank is provided with temperature probes in different quantities, the temperature probes are used for acquiring temperature signals of different positions, simulation signals are converted through a transmitter into digital signals which are sent to a protection controller, the protection controller is not only provided with overtemperature protection logics but also supports temperature difference protection and temperature rising protection, the temperature difference is difference of temperatures acquired by the temperature probes at different positions of the transformer, and temperature rising refers to a rising speed of the temperature acquired by a certain temperature probe. When the transformer internally generates an outgoing wire fault point, and a fault is in a transformer differential protection fixed value scope, temperature rising occurs at a certain point to cause internal outgoing wire temperature difference, or the temperature rising speed reaches a set value, or temperature difference of two points reaches the set value, alarm or tripping operation can be realized for transformer protection, important reference is provided for fault elimination through advanced problem discovery, and the valuable time is saved.

Description

technical field [0001] The invention relates to the technical field of power system protection, in particular to a multi-channel temperature detection and protection method for an oil-immersed transformer. Background technique [0002] Oil-immersed transformer protection has been very perfect in conventional protection functions such as power protection, differential protection, etc., but in the existing technology, there is often only one road for temperature protection. Compared with transformer oil, the oil consumption is small, and a single probe can meet the use requirements, but For large-capacity oil-immersed transformers, several tons of transformer oil are often used. When the internal outgoing line fails at a position far from the temperature probe and does not reach the fixed value of power protection and differential protection, timely protection cannot be provided. Small faults will gradually evolve into larger faults. If after collecting and analyzing the temp...

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Problems solved by technology

[0002] Oil-immersed transformer protection has been very perfect in conventional protection functions such as power protection, differential protection, etc., but in the existing technology, there is often only one road for temperature protection. Compared with transformer oil, the amount of oil used is small, and a single probe can meet the use requirements, but For large-capacity oil-immersed transformers, several tons of transformer oil are often used. When the internal outgoing line fails at a position far from the temperature probe and does not reach the fixed value of power protection and differential protection, timely protection cannot be provided. Class faults will gradually evolve into larger faults

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