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Large-size magnetic core sensor and anti-interference method for discriminating directional coupling pulse

A technology of current sensor and magnetic core, which is applied in the direction of instruments, measuring devices, measuring electricity, etc., can solve the problems of reducing the monitoring sensitivity and reliability, and the measurement cannot be carried out, and achieve the effect of good linearity

Inactive Publication Date: 2003-02-19
西安博源电气有限公司
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Problems solved by technology

[0011] When using the pulse current method to monitor the partial discharge of power transformers online, severe electromagnetic interference greatly reduces the monitoring sensitivity and reliability, and sometimes even makes the measurement impossible

Method used

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  • Large-size magnetic core sensor and anti-interference method for discriminating directional coupling pulse
  • Large-size magnetic core sensor and anti-interference method for discriminating directional coupling pulse
  • Large-size magnetic core sensor and anti-interference method for discriminating directional coupling pulse

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Embodiment

[0051] Example: The test on the #2 main transformer of a certain power plant is as follows: In the off-line state, according to the national standard GB7354-87, a pulse with a rising edge of 45ns and a charge of 1000pC was injected between the high-voltage outlet terminal of phase A and the transformer shell. image 3 , 4 The time-domain responses of the two sensors in phase A displayed by a 500MHz bandwidth oscilloscope (Tektronix TDS3052) respectively. The signals coupled to the two sensors not only have a high signal-to-noise ratio, but also have a good α response. At the same time, the maximum response of the two sensors is The pulse amplitudes are 0.3V and 0.8V respectively, and the time delay is 20ns, which creates necessary conditions for the subsequent processing of pulse signals such as polarity identification and obtaining effective amplitude information.

[0052] from image 3 , 4 It can be seen in the figure that for the analog pulse interference signal from outs...

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Abstract

A large-size magnetic core sensor and its anti-interference method by descriminating the polarity and ampletude of directionally coupled pulse are disclosed, which can be used for the in-line monitor system of local discharge for transofrmer. The two ends of the winding wound on the said magnetic core is serially connected with high-pass filter capacitor and sampling resistor. Its metal shell can shield the electromagnetic interference. Descriminating the polarity and ampletude of directionally coupled pulse can separate the local discharge from interference.

Description

1. Technical field [0001] The invention relates to an on-line monitoring of the insulation state of large-scale electric equipment, in particular to a large-diameter magnetic core type current sensor and an anti-interference method for identifying directional coupling pulses. 2. Background technology [0002] 1. On-line monitoring of partial discharge of power transformers [0003] In the existing on-line monitoring system for partial discharge of power transformers, a small-diameter magnetic core current sensor with an inner diameter of less than 50mm is used to couple discharge signals from the end screen grounding wire, neutral point grounding wire, and core grounding wire, and the non-magnetic core The type current sensor extracts the discharge signal from the high-voltage bushing, suppresses the on-site interference and identifies the internal discharge pulse of the transformer through differential, digital filtering and other measures, so as to obtain more realistic di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R31/08
Inventor 徐阳邱昌容方琼曹晓珑卢相国
Owner 西安博源电气有限公司
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