Anti-interference direct current resistance testing device

Abstract

The invention relates to an anti-interference direct current resistance testing device, which adopts the structure that a direct current, constant voltage and constant current source is connected with an impedance matching unit; the impedance matching unit and a data testing and calculating unit are respectively connected with a standard resistance and measured resistance sampling unit, a relay test action unit and an interference voltage detecting unit; the data test calculating unit is connected with a display unit; the display unit is connected with a keyboard and an over-voltage protection unit; and the keyboard and the over-voltage protection unit are connected with a storage and printing unit. The device can meet the requirements of achieving smooth and accurate test of direct current resistance under the condition of a 350V relative interference voltage or a 100V interphase interference voltage.

Description

technical field [0001] The invention relates to a test device for electric power equipment, in particular to an anti-interference DC resistance test device, which is applied to test the DC resistance of electric power equipment. Background technique [0002] At present, with the development of electric power construction, the number of 66kV and above lines being erected on the same pole and crossing across them is increasing, resulting in a high induction voltage between transmission lines. The single phase-to-ground voltage can reach about 350V, and the phase-to-phase voltage can reach about 100V. [0003] The DC resistance measurement of the line is the basic data for checking the quality of the line crimping joints and the fault location of the line distance, and is also the main basis for evaluating the construction quality of the line. Bridges and digital DC resistance testers cannot complete the test of line DC resistance at all, and there are often serious deviations ...

AI Technical Summary

Problems solved by technology

[0004] In view of the problems existing in the above-mentioned prior art, the present invention proposes an anti-interference DC resistance testing device, which uses harmonic analysis method to realize the measurement of DC resistance parameters of high-voltage lines, and solves the problem that the line DC resistance cannot be tested in the prior art. There are often severe deviations in test data, and even equipment damage and personal electric shock accidents

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