Optical signal collecting and on-line monitoring method for electric power equipment internal failure

Abstract

The light signal the fault part inside closed electric power equipment produces is acquired with optical fiber, signal distinguished and amplified in the signal distinguishing and amplifying circuit to separate discharge signal and / or overheat signal; and the type, degree and position of the fault inside the equipment are judged in the signal processing circuit based on the signal type, size and distribution. The said method is simple, practical, accurate and reliable, and may be used in the in-situ monitoring of main transformer equipment.

Description

Technical field: [0001] The invention belongs to the technical field of power equipment detection, and further relates to the online monitoring of internal faults of power equipment such as airtight transformers and switches under operating conditions. Background technique: [0002] It is an important condition to ensure the safety of the power grid to grasp the operation status of the power equipment and find out the internal faults of the equipment in time. At present, most of the existing on-line monitoring methods are based on the collection of electrical signals, acoustic signals and medium decomposition signals to realize online monitoring. Because power equipment works in high voltage, strong electromagnetic field and large vibration and noise environment, it is often difficult to accurately separate the electrical and acoustic signals of discharge pulses generated by faults from complex interference, resulting in complex detection equipment and poor reliability; The...

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Problems solved by technology

The literature has recorded a device that collects optical signals to monitor discharge faults, but the device cannot distinguish the detected optical signals into optical signals generated by overheating faults and optical signals generated by discharge faults, so the type of fault cannot be judged when the optical signal is generated. Simply diagnosing the discharge fault will be wrong, and judging the strength of the discharge fault based on the measured signal value will also cause misjudgment, because the optical signal generated by the overheating fault is likely to interfere with the measurement results

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