Low-voltage electrical complete switch equipment temperature rise test system

Abstract

The invention provides a low-voltage electrical complete switch equipment temperature rise test system which is directly connected a commercial power voltage source. The system comprises tested low-voltage electrical complete switch equipment, three-phase AC program-controlled constant current sources and a short-circuit copper bar. The complete switch equipment comprises a main bus and multiple feeder branches and switch equipment. The inlet wire end of the main bus is short-connected via the short-circuit copper bar. There are multiple three-phase AC program-controlled constant current sources. The output ends of all the three-phase AC program-controlled constant current sources are connected with the corresponding feeder branch loops, and the input ends are connected with commercial power for power supply. Value assignment of current of all the loops can be performed on touch of the corresponding three-phase program-controlled constant current. Current of all the loops is superposed and then the current requirements of all parts can be realized. Impedance of the main bus, the feeder branches and the switches changes along with temperature in the temperature rise test. Current of all the feeder loops is automatically compensated by three-phase program-controlled constant current so that current of all parts of the main bus, the feeder loops and the switch equipment is ensured to be the same with the corresponding designated current. With application of the system, cost is low, and problems of adjustment difficulty and instable current can be overcome so that objectives of reducing temperature rise test error and electric energy loss can be achieved.

Description

technical field [0001] The invention relates to the technical field of temperature rise test of low-voltage electrical complete sets of equipment, in particular to a temperature rise test system of low-voltage electrical complete switchgear. Background technique [0002] Temperature rise is a crucial technical parameter and index of low-voltage electrical switchgear, which has a great influence on the reliability of low-voltage electrical switchgear. According to the provisions of the national standard GB7251-2013, the temperature rise of low-voltage electrical switchgear must involve the equipment itself, as well as the temperature rise of each functional unit, main busbar and power distribution busbar in the equipment. It can be seen that the key to verifying the temperature rise of low-voltage electrical switchgear is to verify the stability and accuracy of the specified current on each functional unit, main bus, power distribution bus and other components. When the speci...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a low-voltage electrical switchgear temperature rise test system, which is low in cost, can overcome problems such as difficult adjustment and current instability, and achieve the purpose of reducing temperature rise test errors and power loss

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