Measuring device for direct current breakdown voltage of gas discharge tube and method thereof

Abstract

The invention relates to measuring device for direct current breakdown voltage of a gas discharge tube and a method thereof, the measuring device comprises a man-machine interaction parameter setting and measuring result display unit, a microcomputer controlling and measuring unit, an adjustable rise speed DC power source, a current-limiting unit, gas discharge tube load, a microcurrent differential sensor and a voltage sensor, wherein, the man-machine interaction parameter setting and measuring result display unit is composed of a liquid crystal and a keyboard. In the invention, the microcurrent differential sensor is adopted to rapidly and accurately judge a microcurrent conversation signal of the gas discharge tube from an insulation state to a conducting state under the condition that the gas discharge tube is applied with DC voltage in a stated rise speed, wherein, the amplitude of the microcurrent conversation signal is less than 1mA; an A / D collection circuit with high-precision peak holding and high resolution is adopted to realize accurate measurement of the direct current breakdown voltage of the gas discharge tube, wherein, the metering precision is higher than 0.5%; and rapid extraction of a microcurrent signal reduces consumption of the DC voltage on an emission material on the surface of the electrodes of the gas discharge tube, and the inconsistency for measuring the direct current breakdown voltage of the gas discharge tube is lower than 0.5%.

Description

Technical field [0001] The invention belongs to a gas discharge tube electrical performance test device and method, and particularly relates to a gas discharge tube DC breakdown voltage measurement device and method. Background technique [0002] Gas discharge tubes are mainly used in railway communications, post and telecommunications equipment to prevent damage to the equipment from overvoltage shocks and lightning strikes. It is the most widely used switching overvoltage protection device in lightning protection equipment, whether it is AC or DC power supply The lightning protection is also the lightning protection of various signal circuits, and it can be used to leak lightning current into the ground. [0003] The measurement of the DC breakdown voltage of the gas discharge tube is an important link in the production process of the gas discharge tube, and it determines the level of overvoltage protection of the gas discharge tube. The DC breakdown voltage measuring device is ...

AI Technical Summary

Problems solved by technology

[0005] The common point of these two methods is that the photoelectric coupling device is used as the detection unit for the gas discharge tube to change from the insulating state to the conducting state. 10mA-15mA) and the dispersion of the driving current is also large, which makes the stability of the gas discharge tube DC breakdown voltage measurement poor, and more importantly, the consumption of the electron emission material on the electrode surface of the gas discharge tube, which causes gas discharge tube Further changes in the DC breakdown voltage of the discharge tube cannot accurately measure the DC breakdown voltage of the gas discharge tube, so that the voltage protection level of the gas discharge tube cannot be accurately determined

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