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Dynamotor local discharge on-line monitoring method based on double sensor directional coupling

一种局部放电监测、定向耦合的技术，应用在电动发电机测试、仪器、测量电等方向，能够解决放电信号采样频率低、抗干扰效果差等问题，达到剔除或抑制干扰的效果

Inactive Publication Date: 2007-12-12
XI AN JIAOTONG UNIV +1
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Problems solved by technology

[0011] Aiming at the shortcomings of low discharge signal sampling frequency and poor anti-interference effect in the current online monitoring technology for partial discharge of generators in power systems, the present invention aims to provide an online monitoring and anti-interference for partial discharge of generators based on dual-sensor directional coupling method, this method adopts dual-sensor directional coupling and uses software for time delay and amplitude discrimination to eliminate or suppress interference, which can effectively measure the real internal partial discharge signal of the generator, and provides an effective basis for evaluating the insulation status inside the generator. refer to

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  • Dynamotor local discharge on-line monitoring method based on double sensor directional coupling
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  • Dynamotor local discharge on-line monitoring method based on double sensor directional coupling

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Embodiment Construction

[0038] 1. Directional coupling is the main method, supplemented by other methods

[0039] Various interferences can be divided into narrowband (or single frequency) and broadband according to their time domain and frequency domain characteristics. Broadband can be divided into periodic pulse and random pulse. The latter is the most difficult to overcome. This kind of interference is mainly introduced from the power grid (bus bar). The present invention first adopts dual-sensor directional coupling, pulse time delay and amplitude discrimination methods to identify and eliminate this kind of interference. Phase windows and other methods to suppress other interference.

[0040] 2. Principle of Directional Coupling Method

[0041] The principle of the anti-interference method for time delay identification and amplitude identification of dual-sensor directional coupling pulses is: install two capacitive coupling sensors S on the same busbar 1 and S 2, one is set near the high vo...

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Abstract

The on-line monitor method of motor local discharge based on dual sensor directional coupling, sets two electric capacitor sensors with each linked with inspection electric resistance, local discharge inspection system set between two electric capacitor coupling sensors, identifying whether the motor local discharge signal or outside interference signal by the local discharge monitor system, through amplitude removing the outside interference signal, keeping the local discharge signal of the generator, for all kinds of digital signal analysis treatment. It can be used for time lingering, amplitude value for removing and restraining interference, effectively testing the actual inside local discharge signal, to provide effective reference of the insulation status of the inside of the generator.

Description

technical field [0001] The invention relates to an on-line monitoring method, in particular to an on-line monitoring method for generator partial discharge based on dual-sensor directional coupling. Background technique [0002] The safe operation of generators is a prerequisite for quality power supply. A large part of generator failures is caused by insulation failures. Therefore, online monitoring of insulation status has become one of the frontier hot topics in the field of electrical engineering. [0003] The insulation state can be characterized by various characteristic parameters, among which partial discharge (PD) is the most common and sensitive precursor feature of insulation failure. Partial discharge (PD) will occur due to various insulation defects such as delamination, cracking, loosening, semi-conductive layer aging, falling off, high-voltage end pollution, moisture, winding disconnection, poor contact of joints, aging and brittle insulation, etc., and PD It...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34G01R31/02
CPCG01R31/1227G01R31/343
Inventor 徐阳臧真波喇元张征平冯义王凯
Owner XI AN JIAOTONG UNIV
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