System for automatically collecting transformer oil paper insulation return voltage and testing method

Abstract

A system for automatically collecting transformer oil-paper insulation recovery voltage, including a PC, an electrostatic meter, and an experimental transformer. The PC is connected to the electrostatic meter through serial port communication, and the electrostatic meter is connected to the experimental transformer; the electrostatic meter includes a high-voltage DC power supply and an electric meter measurement module The high-voltage DC power supply is connected to both ends of the experimental transformer to form a charging circuit; the meter measurement module is connected in parallel to both ends of the experimental transformer and the high-voltage DC power supply to form a discharge circuit and a test circuit. Compared with the prior art, the present invention has the advantage that the conversion of each stage in the measurement process of the present invention is realized by using the characteristics of the internal voltmeter and ammeter of the electrometer, and the whole process is controlled by software, which can automatically measure the recovery voltage and draw the polarization spectrum And the feature quantity is extracted, the wiring is simple, and the application is flexible.

Description

technical field [0001] The invention relates to the field of life diagnosis of oil-immersed transformers in the electric power industry, in particular to the measurement of the recovery voltage of transformer oil-paper insulation. Background technique [0002] my country's power industry is in a rapid development stage. With the development of ultra-high voltage transmission technology in China, oil-immersed transformers have become one of the very important equipment in the power grid. If the transformer fails, it will affect the normal operation of the entire power grid, and may even cause the collapse of the power grid, causing serious economic losses or personal safety to the country, enterprises, and residential users. Most of the damage and failures of oil-immersed transformers are caused by the aging of the insulation system. With the increase of the operating life of the transformer, affected by factors such as temperature, moisture, and machinery, aging products suc...

AI Technical Summary

Problems solved by technology

However, these methods need to open the transformer cover and lift the core to obtain samples of solid insulation parts, which is time-consuming and laborious, and is no different from equipment overhaul

Moreover, careless maintenance operations, frequent disassembly, etc. may cause damage to the solid insulation of the transformer, and bury new insulation hazards for the equipment.

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