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A vacuum interrupter internal resistance measuring device

A technology of vacuum interrupter and measuring device, applied in measuring device, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve problems such as unreliability and inaccurate measurement results, avoid measurement errors and achieve high measurement accuracy , the effect of good stability

Active Publication Date: 2019-06-07
杭州旭虹真空电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the method often used to measure the internal resistance of vacuum interrupters is the DC voltage drop method, but in actual measurement, the influence of measurement conditions (electrical ripple) and measurement environment conditions (temperature drift of standard resistance) on the measurement results is often ignored , leading to inaccurate and unreliable measurement results

Method used

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  • A vacuum interrupter internal resistance measuring device
  • A vacuum interrupter internal resistance measuring device
  • A vacuum interrupter internal resistance measuring device

Examples

Experimental program
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Embodiment

[0020] Please refer to the attached figure 1 As shown, the first step: prepare a lithium battery pack and connect it to the charger. This embodiment uses a 180Ah lithium battery; the second step: connect a 0.01-level high-precision shunt, matching resistors and the vacuum interrupter to be tested. Into the constant current power supply circuit, the high-precision shunt is immersed in the silicone oil of the constant temperature bath; the third step: the digital signal processing unit controls the charging switch to be disconnected, and the lithium battery is used as the circuit constant current source; the fourth step: measure the high-precision The voltage signal at both ends of the shunt resistor and the vacuum interrupter to be tested is input to the amplification and analog-to-digital conversion unit; Step 5: After the voltage signal is amplified by the operational amplifier, it is converted into a digital signal and sent to the digital signal through the analog-to-digital ...

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Abstract

The present invention discloses a device with high precision and high stability for measuring vacuum interrupter internal resistance, the measurement precision of the vacuum interrupter internal resistance can be improved, at the same time environmental impact factors can be reduced, and a measurement result is authentic and believable. The device comprises a lithium battery, a matching resistor, a small charger, a constant temperature bath, two amplification and analog-digital conversion units, and a digital signal processing unit. The lithium battery power is employed by the power supply of the device, a precise current source is not needed, the cost is low, and the influence of electric ripple on measurement can be eliminated at the same time. A high precision shunt is placed into the constant temperature bath to ensure that the high precision shunt works in a calibration temperature range. The measurement errors caused by environment factors are eliminated and avoided in the measurement process, and the device has high measurement accuracy and good stability.

Description

technical field [0001] The invention relates to a measuring device, in particular to a device for measuring the internal resistance of a vacuum interrupter. Background technique [0002] The internal resistance of the vacuum interrupter mainly depends on the contact resistance between the dynamic and static contacts of the vacuum interrupter. Contact resistance is one of the most basic parameters of contact performance, and its value directly reflects the reliability of the electrical contact of the vacuum interrupter. Therefore, the internal resistance of the vacuum interrupter is an An important data for acceptance. At present, the method often used to measure the internal resistance of vacuum interrupters is the DC voltage drop method, but in actual measurement, the influence of measurement conditions (electrical ripple) and measurement environment conditions (temperature drift of standard resistance) on the measurement results is often ignored , leading to inaccurate a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/14
Inventor 黄大贵张勇杰葛森吴献刚刘宇禄思源
Owner 杭州旭虹真空电器有限公司
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