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

A current sensor and directional coupling technology, applied in the direction of instruments, measuring electricity, measuring electrical variables, etc., can solve the problems of reducing monitoring sensitivity and reliability, and measurement cannot be performed, and achieve good linearity effect

Inactive Publication Date: 2005-07-06
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

[0050] 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.

[0051] 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

The invention discloses a large-diameter magnetic core type current sensor and an anti-interference method for directional coupling pulse polarity and amplitude identification, which is suitable for a transformer partial discharge on-line monitoring system, and is arranged at the flange of the transformer high-voltage outlet bushing base , coupling the partial discharge signal through the high-voltage outgoing line. After winding the coil around the magnetic core, connect high-pass filter capacitors and sampling resistors in series at both ends of the coil. The sensitivity of the series circuit is greater than that of the parallel circuit, and it has a good filtering effect on low-frequency signals. The semi-enclosed sensor shell made of metal can effectively suppress electromagnetic interference in the space while coupling the high-voltage outlet signal, and can prevent rain, dust, etc., and improve the anti-interference ability and vibration resistance of the coil. Through the anti-interference method of directional coupling pulse polarity and amplitude identification, the software can confirm and compare the polarity or amplitude of the pulses collected by the two sensors installed at the casing flange and at the end screen of the casing to identify Partial discharge and external disturbances.

Description

technical field [0001] The invention relates to an on-line monitoring of the insulation state of large electric equipment, in particular to an anti-interference method for directional coupling pulse identification of a large-diameter magnetic core type current sensor. Background technique [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 discharge info...

Claims

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Application Information

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Patent Type & Authority Patents(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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