Contact finger pressure test instrument of high-voltage isolation switch

A high-voltage isolating switch and pressure testing technology, which is applied in the direction of circuit breaker testing and the measurement of the property and force of piezoelectric resistance materials, can solve the problems of lack of preventive monitoring methods, etc., and achieve light weight, high accuracy, The effect of simple structure

Inactive Publication Date: 2013-01-09
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, only by testing the contact resistance of the knife switch circuit to judge the contact condition of the contact part,

Method used

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  • Contact finger pressure test instrument of high-voltage isolation switch
  • Contact finger pressure test instrument of high-voltage isolation switch

Examples

Experimental program
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Embodiment Construction

[0010] Such as figure 1 and figure 2 As shown, this embodiment includes a mold 3 matching the contact shape of the high-voltage isolating switch during normal use, a piezoresistive pressure sensor 2, an acquisition and amplification circuit 7, a single-chip microcomputer 8 and a liquid crystal display 9 . The piezoresistive sensor 2 is clamped and fixed in the mold 3 . 4 is a contact finger, and 1 is a contact finger spring. The piezoresistive sensor 2 is a piezoresistive structure composed of rheostat R11, rheostat R12, rheostat R13 and rheostat R14, the acquisition amplifier circuit 7 adopts the OP07 type operational amplifier U1, the single-chip microcomputer 8 adopts the C805lF020 single-chip microcomputer U2, and the liquid crystal display 9 Select HSl2864 graphics dot matrix liquid crystal display U3. The signal output terminal of the piezoresistive pressure sensor 2 is connected to the input terminals 2 and 3 of the operational amplifier U1 through the RS232 data li...

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PUM

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Abstract

The invention discloses a contact finger pressure test instrument of a high-voltage isolation switch. The contact finger pressure test instrument comprises a mould which is matched with a contact of the high-voltage isolation switch in the aspect of shape during the normal use, a contact type pressure sensor, an acquisition and amplification circuit, a singlechip and a display, wherein the contact type pressure sensor is detachably embedded in the mould and one end is exposed out of the mould; a signal output end of the contact type pressure sensor is connected with a signal input end of the acquisition and amplification circuit through an RS 232 data line; a signal output end of the acquisition and amplification circuit is connected with a signal input end of an A/D (Analog/Digital) conversion circuit in the singlechip; a signal output end of the A/D conversion circuit in the singlechip is connected with a signal input end of a processor in the singlechip; and a signal output end of the processor in the singlechip is connected with the display. According to the contact finger pressure test instrument, the contact finger pressure of the high-voltage isolation switch can be tested, so that the contact heating problem of the high-voltage isolation switch due to insufficient contact finger pressure of the high-voltage isolation switch can be solved in advance; and the contact finger pressure test instrument has the advantages of convenience in test, high accuracy and visualized display.

Description

technical field [0001] The invention relates to a testing instrument for testing the finger pressure of a high-voltage isolating switch. Background technique [0002] At present, the heating problem of high-voltage isolating switch contacts will lead to melting of the hot parts of the contacts, increasing the number of power outages and affecting the operation structure of the power grid. After the analysis and statistics of the heating problems of the existing high-voltage isolating switches, it is found that the heating of the contact fingers of the isolating switch accounts for more than 80% of the total heating problems, and the contact heating caused by insufficient contact pressure of the contact parts of the isolating switch accounts for more than 80% of the total heating problems. To more than 60% of the heating defects of the isolating switch fingers, therefore, the key to reducing the heating of the high-voltage isolating switch is to ensure the pressure of the iso...

Claims

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Application Information

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IPC IPC(8): G01L1/18G01R31/327
Inventor 崔猛陈磊冯红卫张志超陈冰彭涛詹丽
Owner STATE GRID CORP OF CHINA
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