CN2247346Y

CN2247346Y - Device for on-line monitoring transformer inner discharge

Info

Publication number: CN2247346Y
Application number: CN 95245275
Authority: CN
Inventors: 何雨震; 任西勇; 陈云涛; 邱昌容; 曹晓龙; 徐阳; 甄为红
Original assignee: XI'AN POWER SUPPLY BUREAU; Xian Jiaotong University
Current assignee: XI'AN POWER SUPPLY BUREAU; Xian Jiaotong University
Priority date: 1995-09-22
Filing date: 1995-09-22
Publication date: 1997-02-12
Anticipated expiration: 2005-09-22

Abstract

The utility model discloses a device for on-line monitoring transformer inner discharge which belongs to the field of the technology of physical measurement. The monitoring result of the output of the optical fiber splicing photoelectric translating circuit of a refractory transformer oil is printed out through an amplifier and a data acquisition and processing circuit. The utility model has the advantages of lower cost, strong anti-interference capability, and reliable work, realizing the on-line inspection of the partial discharge of the inside of a transformer.

Description

The device of shelf depreciation in the on-line monitoring transformer

The utility model belongs to the physical measurement techniques field, further relates to the new device of shelf depreciation in a kind of on-line monitoring transformer.

According to the regulation of GB GB1094.3-85 " electric power transformer insulated level and Insulation Test ", the above transformer of 220KV should be done local discharge test.The test method that adopts generally is after transformer is out of service at present, measures with electrical measuring method.Costing an arm and a leg of electrical measuring method testing equipment need 500,000 yuan approximately, and online detection is difficult to eliminate various electrical Interference.Also have sound detection except that electrical measuring method, sound detection equipment needs 200,000 yuan approximately, and can be subjected to various acoustic jammings, and sensitivity sometimes is very low.Therefore these two kinds of methods all are difficult to satisfy the requirement of transformer online monitoring shelf depreciation.Flash spotting is the light velocity measurement shelf depreciation of discharging and sending by measuring, and transformer is airtight lighttight, and this brings advantage to flash spotting.Flash spotting can be got rid of electricity, acoustic jamming, and price is also relatively more cheap.So far also do not use the device of the online detection transformer of flash spotting internal discharge both at home and abroad.

The purpose of this utility model is to provide a kind of flash spotting is carried out online detection to shelf depreciation in the transformer device of using.

The utility model comprises opto-electronic conversion and signal acquisition processing circuit, and the optical fiber of high temperature resistant transformer oil connects photoelectric switching circuit, and the output of photoelectric switching circuit connects amplifier, the output termination data acquisition processing circuit of amplifier.

The utility model will be further described below in conjunction with accompanying drawing.

Fig. 1 is the whole block scheme of the utility model.

Fig. 2 is the utility model amplifying circuit electrical schematic diagram.

Fig. 3 is the utility model data acquisition processing circuit electrical schematic diagram.

Optical fiber 2 of the present utility model adopts the silica fibre bundle, and the additional ptfe sheath can be embedded in it in the transformer 1 in the medium-term and long-term work of 100 ℃ of high temperature transformer oil, can not change the performance of Electric Field Distribution, dielectric strength and oil.It is accepted the light of discharge generation and is transferred to photoelectric commutator 3.

Photoelectric commutator 3 adopts the photomultiplier of high sensitivity, low noise, quick response, light signal is become electric signal, and export to amplifier 4 through impedance matching.

Amplifier 4 is seen accompanying drawing 2, by the feeble signal of photomultiplier input, through range conversion 6 three operational amplifiers of serial connection (2 OP37,1 LF357) discharge signal is amplified to 0.5～5V, gives data acquisition processing circuit 5.

Data acquisition processing circuit 5 as shown in Figure 3, adopt 8098 single-chip microcomputers to carry out data acquisition and processing, program write EPROM, the discharge simulating signal is through polarity switching 7, peak holding circuit 8, A/D conversion becoming digital quantity, be stored in ROM, calculate by statistics, the result can be shown or printer PP40 printing by display module LCD again.Read-only memory EPROM, ram memory, LCD demonstration, printer, keyboard link to each other with single-chip microcomputer through data bus, address bus, control bus.

The utility model can be used for its inner shelf depreciation of 110KV-330KV UHV (ultra-high voltage) large-capacity power transformer online monitoring, thereby whether diagnosing insulation is intact, guarantees electric power netting safe running.

This device can be got rid of external interference.In transformer, can be in distance discharge source 0.5m place, the discharge that records 2000PC.The discharge capacity summation and the discharge time that can show or print the discharge capacity and the mean value thereof of 2 maximums and measure 50 cycles.Can be used for the inner partial discharge monitoring of transformer.

Claims

1, the device of shelf depreciation in the on-line monitoring transformer, it comprises opto-electronic conversion and signal acquisition processing circuit, it is characterized in that: the optical fiber of high temperature resistant transformer oil connects described photoelectric switching circuit, and the output of photoelectric switching circuit connects amplifier, and amplifier out connects data acquisition and treatment circuit.

2, the device of shelf depreciation in the on-line monitoring transformer as claimed in claim 1, it is characterized in that: the output of the photomultiplier in the described photoelectric commutator connects amplifier through impedance matching box.

3, the device of shelf depreciation in the on-line monitoring transformer as claimed in claim 1 is characterized in that: three operational amplifiers of range selector serial connection in the described amplifier.

4, the device of shelf depreciation in the on-line monitoring transformer as claimed in claim 1, it is characterized in that: the input end of the output termination peak holding circuit of the polarity switching of described signal acquisition processing circuit, the output terminal of peak holding circuit connects single-chip microcomputer 8098 A/D end, and read-only memory EPROM, ram memory, LCD demonstration, printer, keyboard link to each other with single-chip microcomputer through data bus, address bus, control bus.