Preheating switching device for fuse breaking capacity test

Abstract

The invention relates to the technical field of electric appliance detection and discloses a preheating switching device for fuse breaking capacity test. The preheating switching device is connected to a large-capacity test system for fuse breaking capacity test, appropriate fuse fusing time is set in a monitoring / operation computer, a test sample (fuse) is mounted, data acquisition of low-voltage current is completed through a shunt by an electrical test data acquisition system, data acquisition of high-voltage current is completed through a Rogowski coil and an integrator by the electrical test data acquisition system, interlocking of a high-voltage breaker and an isolation breaker is realized through a programmable controller, and closing operation of the high-voltage breaker can be started after the isolation breaker is opened. By application of the preheating switching device, the fuse breaking capacity test process is controlled within 30-45 seconds, automatic control is realized, switching time interval of the high-voltage breaker and the isolation breaker is small, test success rate is increased, risk that test equipment is burnt down is lowered, and test cost is lowered.

Description

technical field [0001] The invention relates to the technical field of electric appliance detection, in particular to a preheating conversion device used for a fuse breaking capacity test. Background technique [0002] At the current level of scientific and technological development, the ability of switching electrical appliances cannot be solved by simulation calculation. The development of products must pass the information and experience provided by the large-capacity test station, and finally verify whether it can be finalized and produced through tests. For the fuse breaking capacity test No.2a, the whole test process takes 30-45 seconds, and for the large-capacity laboratory that realizes the on-off test, the characteristic room of the circuit bears the dynamic stability and heat generated by the large current. Stable, based on the consideration of test cost, the time it bears high current is often limited to less than 10 seconds. The conventional method is to apply t...

AI Technical Summary

Problems solved by technology

For the fuse breaking capacity test No.2a, the whole test process takes 30-45 seconds, and for the large-capacity laboratory that realizes the on-off test, the characteristic room of the circuit bears the dynamic stability and heat generated by the large current. Stable, based on the consideration of test cost, the time it bears high current is often limited to less than 10 seconds

The conventional method is to apply the test current at low voltage and high current, and then switch to the high voltage test (large capacity test system) when it is about to break, which cannot meet the 30-45 second requirement of the fuse breaking capacity test No. 2a, while in The long-time high-current device used for temperature rise and characteristic tests in electrical tests cannot meet the requirements of No.2a because it is a low-voltage system and cannot reflect its arc characteristics when the fuse is broken.

[0003] In the 1980s, the state organized relevant units to study the "Research on Preheating Steady Flow and Automatic Switching Device for Fuse Test" ("Sixth Five-Year Plan" scientific and technological research project), and passed the acceptance in 1986. However, with the development of electrical manufacturing technology, This achievement can no longer meet the needs of automated monitoring

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