Method and system for detecting DC loop fault
A DC circuit and circuit technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problem that the multimeter cannot test the resistance DC circuit fault, etc., and achieve the effect of improving test accuracy and accurate determination
Inactive Publication Date: 2010-11-10
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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Problems solved by technology
In view of this, the present invention provides a method and system for detecting DC circuit faults to solve the problem that a multimeter cannot be used to test DC circuit faults with excessive resistance
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The invention discloses a method and a system for detecting direct current circuit failure. The method comprise the following steps of inversing a high-capacity accumulator into high frequency alternating current via IGBT, and rectifying the high frequency alternating current to obtain discharge direct current; loading the loading the discharge direct current on a to-be-detected circuit; determining present current and voltage of the to-be-detected circuit, and calculating the resistance of the to-be-detected circuit based on the present current and the circuit voltage; and analyzing the resistance of the to-be-detected circuit based on a preset circuit abnormality determination standard, and determining whether the to-be-detected circuit is failed. A heavy current having an external power supply is adopted to excite the to-be-detected circuit in the invention, so that the failure point concealed in the to-be-detected circuit is exposed, and subsequently the to-be-detected circuit is tested. Moreover, the detection accuracy is improved by the four-wire system measuring technique and the current reversed technique.
Description
Method and system for detecting DC circuit faults technical field The invention relates to the technical field of test and measurement, in particular to a method and system for detecting DC circuit faults. Background technique DC power has the characteristics of being able to store, so in power plants and substations, in order to provide working power for control circuits, signal circuits, relay protection and automatic devices, etc., an independent DC power supply system is provided. The importance of the DC power system is related to the safe and stable operation of the entire power grid and equipment. A DC link is a conductive circuit used to transmit DC power. In practical application, the DC circuit has the hidden danger of increased resistance of the DC circuit due to poor contact or partial burning of the air switch contacts or fuses during operation, which may cause heat generation at the poor contact in the DC circuit until it burns out. In addition, the abnorm...
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IPC IPC(8): G01R31/02G01R27/08
Inventor 石光赵勇赵军
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST