A system and method for detecting defects in electrical equipment using sweeping impulse current

Abstract

The invention discloses a system for detecting defects in electrical equipment by using frequency-sweeping impulse currents. The system includes an impulse current generator, an adjustable inductance, a vibration sensor, a data acquisition device, and a vibration testing system; the impulse current generator can be connected in series. After the inductance is adjusted, it is connected to one end of the electrical equipment; the vibration sensor is installed on the outer surface of the electrical equipment, and the vibration sensor is connected to the vibration test system through the data acquisition device; the vibration test system performs frequency spectrum analysis on the vibration signal to identify the mechanical defects of the electrical equipment category. The invention judges and identifies the mechanical fault type of the equipment through the detection and analysis of the vibration signal under the frequency-sweeping impact current, and can detect the internal mechanical defect of the electrical equipment. The invention also discloses a method for detecting defects of electrical equipment by using the frequency-sweeping impulse current.

Description

technical field [0001] The invention relates to an electrical equipment defect detection technology, in particular to a system and method for detecting electrical equipment defects by using frequency-sweeping impulse current. Background technique [0002] The normal operation of electrical equipment is the key to the stability of the entire power system. Therefore, the detection and identification of electrical equipment defects become the basis for maintaining the stability of the power system. Among the many electrical equipment defects, the mechanical structure defects have a certain degree of concealment, and if they are not dealt with in time, they may cause electrical failures, affect the normal operation of the equipment, and cause power outages. It is difficult to detect and identify mechanical structural defects of electrical equipment in a timely and effective manner through conventional electrical detection methods. Most of the existing relatively mature defect de...

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Problems solved by technology

[0004] However, the above method has the following problems: First, the system inputs a steady-state AC current, which can generate a large alternating electromagnetic force against the transformer winding to cause vibration, but cannot cause effective vibration responses to other non-winding electrical equipment, so it is applicable Narrower

Second, the system identifies defects by detecting the steady-state vibration response of the transformer under a certain frequency excitation signal. Its spectrum coverage is limited, and the detection time is long, so it cannot obtain rich mechanical structure response information in a timely and effective manner.

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