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Circuit for testing voltage drop of contact in electrical life experiment of AC electric appliance

A technology of experimental process and electrical life, applied in circuit breaker testing, voltage/current isolation, measuring current/voltage, etc., can solve the problems of low input impedance, slow conversion speed, poor test accuracy, etc., to achieve simple test process, The effect of taking into account the test accuracy and improving the measurement range

Active Publication Date: 2019-02-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the conversion speed of this method is slow, the input impedance is low, the lower the AC frequency, the worse the test accuracy

Method used

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  • Circuit for testing voltage drop of contact in electrical life experiment of AC electric appliance
  • Circuit for testing voltage drop of contact in electrical life experiment of AC electric appliance
  • Circuit for testing voltage drop of contact in electrical life experiment of AC electric appliance

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Experimental program
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Effect test

specific Embodiment approach 1

[0010] Specific implementation mode one: the following combination figure 1 This embodiment will be specifically described. This embodiment includes an AC voltage source 1, a load 2, a pair of contacts under test 3, a zero-flux Hall current sensor group 4, a current limiting resistor 5, a low-pass filter 7, and a dual-channel high-resistance low-voltage amplifier 8 , a gain-adjustable voltage amplifier 9, a multi-channel AD converter 10, a single-chip microcomputer 11 and a display module 12, one electrode of the AC voltage source 1 is connected to one end of the load 2, and the other end of the load 2 is connected to the contact pair 3 under test. One contact and a signal input terminal of the low-pass filter 7, the other electrode of the AC voltage source 1 passes through the zero-flux type Hall current sensor group 4, and connects the other contact of the measured contact pair 3 and the limiter. One end of the current-limiting resistor 5, the other end of the current-limit...

specific Embodiment approach 2

[0027] Specific implementation mode two: the following combination figure 1 This embodiment will be specifically described. The difference between this embodiment and Embodiment 1 is that it also includes a combined overvoltage protector 6, and the two terminals of the combined overvoltage protector 6 are respectively connected to the two signal input terminals of the low-pass filter 7;

[0028] The combined overvoltage protector is composed of a transient suppression diode and a Zener diode connected in parallel.

[0029] When the two electrical contacts are disconnected, the voltage U across the measured contact pair 3 Ci Equal to the voltage of the AC voltage source 1, at this time the current limiting resistor 5 and the combined overvoltage protector 6 can limit the input voltage of the low-pass filter 7 within a safe range; when the two electrical contacts are closed, the combined overvoltage protector 6 Not working.

[0030] From the current methods of testing the con...

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PUM

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Abstract

The invention discloses a circuit for testing the voltage drop of a contact in an electrical life experiment of an AC electric appliance, relates to the measurement for the voltage drops of the contacts of a relay, a contactor and a switch, and can greatly improve the measurement range while considering the test precision. The AC voltage source in a tested circuit excites a load and a tested contact pair which are in a series relationship. The voltage drops of the small contacts at the two ends of the tested contact pair passes through a low-pass filter into a two-way voltage amplifier with high impedance and low power, and the amplified voltage signal enters a voltage amplifier with adjustable gain to obtain an output voltage, wherein the amplitude is in a secondary function relation withthe voltage drop of the contacts of the contact pair. The output voltages of the voltage amplifier with adjustable gain and the two-way voltage amplifier with high impedance and low power enter a multi-way AD converter to be converted into digital quantities. A zero-flux Hall current sensor group and the voltage amplifier with adjustable gain are arranged in the circuit, so that the measurement range can be greatly improved while the test precision is considered, and the shortcomings of the existing measuring instrument can be effectively overcome.

Description

technical field [0001] The invention relates to a circuit for testing the voltage drop of a contact point during the electric life experiment of an AC electrical appliance, which is used for measuring the voltage drop of a contact point during the electric life experiment of various AC relays, contactors and AC electric switches. Background technique [0002] During the electrical life experiment of AC electrical appliances (such as AC relays and AC contactors), testing their electrical parameters and time parameters is of great engineering practical value for determining the failure mechanism of AC electrical appliances and completing failure analysis. [0003] The measurement of AC electrical contact voltage drop belongs to micro voltage measurement. Measurement methods can be divided into analog measurement method, thermoelectric transducer method and so on. [0004] The analog measurement method, also known as the instrument measurement method, is a method of measuring ...

Claims

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Application Information

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IPC IPC(8): G01R31/327G01R19/25G01R15/20G01R1/30
CPCG01R1/30G01R15/202G01R19/2509G01R31/327G01R31/3278
Inventor 任万滨张旭郑哲王国涛
Owner HARBIN INST OF TECH
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