Automatic testing device for three-phase aftercurrent action protector

Abstract

The invention discloses an automatic testing device for a three-phase aftercurrent action protector. The automatic testing device for the three-phase aftercurrent action protector comprises a testing control module, an inversion voltage stabilizing module, a voltage and current adjusting module and a temperature detection module; the testing control module controls the inversion voltage stabilizing module to perform inversion and voltage stabilizing on an input power source according to testing types; the voltage and current adjusting module performs voltage boosting and current rising on a power source signal after inversion and voltage stabilizing to obtain a required testing current and a testing voltage and provide for a tested three-phase aftercurrent action protector; the temperature detection module detects the temperature of the tested three-phase aftercurrent action protector under the testing current and the testing voltage. The automatic testing device for the three-phase aftercurrent action protection can comprehensively and effectively test performance characteristics and temperature characteristics and is high in testing stability and accuracy.

Description

technical field [0001] The invention relates to the technical field of residual current operated protector testing, in particular to an automatic test device for a three-phase residual current operated protector. Background technique [0002] In the low-voltage power distribution network, due to the many and complex lines, it is very difficult to maintain and overhaul the lines. Especially in the rural power distribution network, due to the backward power infrastructure construction and the weak awareness of residents' safe use of electricity, power failures occur from time to time. Installing residual current operating protector (hereinafter referred to as protector) is an effective protective measure to prevent personal electric shock, electrical fire and electrical equipment damage in low-voltage power grid. However, due to the influence of overcurrent and temperature rise during on-site operation, the protector often has faults such as misoperation and refusal to operat...

AI Technical Summary

Problems solved by technology

Due to the existence of many uncertain factors such as the fluctuation of the grid voltage, the error of manual judgment, the change of the lead resistance in the current-carrying circuit, and the heat change of the resistance of the load itself, the test current will change with the change of uncertain factors, so that the test current The stability and accuracy are not high, it is difficult to meet the test requirements in the national standard

[0004] For the temperature rise characteristics test caused by overcurrent, high voltage, etc., at present, only the method of manually recording the temperature can be used. Due to the limitation of the structure of the protector and the stability and accuracy of the test current, the operation of manual temperature measurement is difficult and accurate. Low, poor flexibility, and manual readings are prone to errors, it is difficult to accurately record the entire heating process, so it is not convenient to intuitively and comprehensively analyze the characteristics of the protector, and the test consistency of different protectors is also poor

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