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
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[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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