Electrical equipment loop resistor test system and contact state evaluation method

Abstract

The invention provides an electrical equipment loop resistor test system and a contact state evaluation method. According to the requirement for performance detection of conductive loop nodes of various kinds of electrical equipment, characteristics of contact resistors of the conductive loop nodes of the electrical equipment and a basic range of loop resistor measuring are integrated, and a supercapacitor is adopted to generate kilo-ampere-level long-wave-tip impact currents on the basis that electromagnetic interference resistance and measurement accuracy are met. According to loop resistor difference reflected by the conductive loop nodes (a GIS conductive loop, a high-voltage breaker, a high-medium voltage isolating switch, a high-medium busbar and the like) of the electrical equipment of an electric power system, loop resistance values of the electrical equipment are accurately measured, the contact state of the electrical equipment is evaluated through the change rate along with impact current increase of loop resistors, and the defect that a traditional test method judges only through a management value.

Description

technical field [0001] The invention provides a loop resistance testing system and a contact state evaluation method of electrical equipment, which belong to the technical field of loop resistance detection. In view of the needs of performance testing of conductive loop nodes of various electrical equipment, the characteristics of the contact resistance of conductive loop nodes of various electrical equipment and the basic range of loop resistance measurement are integrated to meet the requirements of [0002] On the basis of anti-electromagnetic interference and measurement accuracy, it can accurately measure the loop resistance of electrical equipment; at the same time, it provides a method to evaluate the contact state of electrical equipment through the change rate of loop resistance with the increase of impulse current. Background technique [0003] The contact resistance of the conductive circuit node of electrical equipment is composed of the contact resistance be...

AI Technical Summary

Problems solved by technology

[0007] At present, most of the loop resistance measuring instruments at home and abroad use switching power supplies, which can only output a current of 100A to 300A. To generate a larger current, the cost and weight of the equipment will be greatly increased, which basically cannot meet the requirements of field testers.

There are foreign literature reports that using electrolytic capacitor bank as energy storage power supply can release 1kA current, but the capacitor bank itself has a mass of 10kg, and the use and maintenance of electrolytic capacitors is very difficult, which cannot meet the requirements of engineering applications.

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