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Oil-immersed power transformer top-level oil temperature monitoring method based on thermistor

A technology for power transformers and thermistors, which is applied in the directions of thermometers, thermometers, and instruments that use electrical/magnetic components directly sensitive to heat, can solve the threat of safe operation of oil-immersed power transformers and reduce the operation of oil-immersed power transformers. life and other issues, to achieve the effect of simple structure, high accuracy and easy operation

Inactive Publication Date: 2012-07-18
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The insulation and aging rate of oil-immersed power transformers are related to the temperature of oil-immersed power transformer oil. Exceeding the allowable limit of temperature will not only reduce the operating life of oil-immersed power transformers, but also affect the safety of oil-immersed power transformers. run a threat

Method used

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  • Oil-immersed power transformer top-level oil temperature monitoring method based on thermistor
  • Oil-immersed power transformer top-level oil temperature monitoring method based on thermistor
  • Oil-immersed power transformer top-level oil temperature monitoring method based on thermistor

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Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: as figure 1 Shown: This method for monitoring oil temperature on the top layer of oil-immersed power transformer based on thermistor is to firstly connect the thermistor temperature sensor to the multimeter 11, and then insert the thermistor temperature sensor into the oil-immersed power transformer through the test hole 13 12 in the top layer of oil; after being stabilized, according to the thermistor resistance measured by the multimeter; then through the relationship between resistance and temperature , calculate the temperature of the oil on the top layer of the oil-immersed power transformer; finally, compare the measured temperature with the temperature rise standard of the oil-immersed power transformer to judge whether the oil-immersed power transformer is in normal working condition.

[0029] The national standard GB1094.2-1996 "Power Transformer Part 2 Temperature Rise" for oil-immersed power transformers stipulates that for transformers using...

Embodiment 2

[0031] Embodiment 2: as figure 1 Shown: the specific method and process of this thermistor-based oil-immersed power transformer top layer oil temperature monitoring method are the same as in embodiment 1. In order to better realize this method, an adjustable thermistor temperature sensor is adopted in this embodiment, such as figure 2 Shown: It consists of thermistor 1, copper tube 2, threaded copper tube 3, copper pad 4, fluorosilicone sealing ring 5, nut 6, wire hole 7, lead wire 8, handle 9, polytetrafluoroethylene Sleeve 10, universal meter 11; Copper pipe 2, threaded copper pipe 3 and handle 9 are integrally formed structure, and wire hole 7 is processed inside, and the bottom end of copper pipe 2 is sealed; The copper tube 3 is covered with a copper pad 4, a fluorosilicone sealing ring 5 and a nut 6 in sequence; through the wire hole 7, the thermistor 1 is placed at the bottom of the wire hole 7, and the transmission line is protected with a polytetrafluoroethylene sle...

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Abstract

The invention relates to an oil-immersed power transformer top-level temperature monitoring method based on a thermistor, belonging to the electronic measurement technical field. The method comprises the steps of: connecting a temperature sensor of the thermistor with a multimeter; inserting the temperature sensor of the thermistor into the top-level oil of a transformer through a testing hole of the oil-immersed power transformer, when the stability is achieved, measuring the resistance of the thermistor by the multimeter; then comparing the measured temperature with the temperature raising temperature of the oil-immersed power transformer so as to determine whether the oil-immersed power transformer is operated as usual. According to the method, the thermistor temperature sensor can be inserted into the top-level oil of the oil-immersed power transformer for a long time, therefore, the temperature of the top-level oil of the oil-immersed power transformer can be detected in real time; and the temperature sensor is simple in structure and convenient to operate.

Description

technical field [0001] The invention relates to a thermistor-based oil-immersed power transformer top-layer oil temperature monitoring method, which belongs to the technical field of optoelectronic measurement. Background technique [0002] The oil-immersed power transformer is one of the core equipment for the operation of the power system, and the oil temperature of the oil-immersed power transformer is directly related to the service life of the oil-immersed power transformer and the operation safety of the power transmission and transformation system. Therefore, it is necessary for each transformer to The power station monitors the oil temperature of the oil-immersed power transformer. The insulation and aging rate of oil-immersed power transformers are related to the temperature of oil-immersed power transformer oil. Exceeding the allowable limit of temperature will not only reduce the operating life of oil-immersed power transformers, but also affect the safety of oil-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/22G01K7/18
Inventor 李川李国民王达达张少泉李建发孙家禄
Owner KUNMING UNIV OF SCI & TECH
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