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Automatic direct-current magnetic bias compensation device of metering winding of current transformer

A technology of current transformer and DC bias, which can be used in measuring devices, measuring electrical variables, instruments, etc., and can solve problems such as large errors

Active Publication Date: 2014-07-02
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods all use simplified circuit models, ignoring relevant factors such as substation grounding network, soil structure, power grid topology network, DC resistance of substation transformers, and DC resistance of transmission lines, resulting in large errors.

Method used

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  • Automatic direct-current magnetic bias compensation device of metering winding of current transformer
  • Automatic direct-current magnetic bias compensation device of metering winding of current transformer
  • Automatic direct-current magnetic bias compensation device of metering winding of current transformer

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Embodiment Construction

[0029] The present invention will be further described in conjunction with the accompanying drawings.

[0030] Such as figure 1 As shown, the metering core of the current transformer has a metering winding and a compensation winding, where the metering winding and the compensation winding can be two independent coils of the same iron core, such as figure 1 The middle coil K1K2 and the coils K3K4 and K2K3 are not connected, and can also be different taps of the same iron core and one coil, such as figure 1 In K1K2K4, K2K3 linkage. The metering winding is used as the output winding of the current transformer for normal operation, while the compensation winding uses the unused winding of the multi-tap current transformer or the secondary winding specially designed for compensation to inject compensation current. The realization of the DC bias automatic compensation function is to control the DC current source to inject a corresponding amount of reverse DC current into the secon...

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PUM

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Abstract

The invention discloses an automatic direct-current magnetic bias compensation device of a metering winding of a current transformer. The automatic direct-current magnetic bias compensation device is characterized in that a metering iron core of the current transformer is provided with the metering winding and a compensation winding which are independent of each other, and the compensation winding is connected with the automatic direct-current magnetic bias compensation device. The automatic direct-current magnetic bias compensation device is used for detecting the size and phase position of an even harmonic component in an output signal of the secondary-side metering winding of the current transformer, and therefore a direct-current source is controlled to inject reverse direct current of the corresponding amount to the secondary-side compensation winding of the current transformer as compensation current, the compensation current generates a magnetic field in the compensation winding, a magnetic field generated by the primary-side direct current is offset, and then automatic and on-line compensation for the direct-current magnetic bias of the current transformer is achieved. The automatic direct-current magnetic bias compensation device is remarkable in effect of automatically compensating for the direct-current magnetic bias of the current transformer.

Description

technical field [0001] The invention relates to a DC bias magnetic automatic compensation device for a current transformer metering winding, which has the function of automatically compensating the DC bias magnetic and belongs to the field of electromagnetic measurement of electric power systems. Background technique [0002] As an important part of the primary equipment of the substation, the current transformer plays an important role in providing measurement signals for subsequent measurement, protection and monitoring equipment in the substation, and its operation reliability and stability are very important. [0003] The grid structure of AC and DC mixed operation makes the mutual influence between AC and DC systems more obvious. When a bipolar HVDC transmission line is overhauled or a single-pole fault needs to be operated in a single-pole-earth loop mode, there will be great The DC current flows through the grounding electrode. At this time, a constant DC current fiel...

Claims

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Application Information

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IPC IPC(8): G01R35/02
CPCG01R15/185
Inventor 王忠东万达李红斌黄奇峰陈刚陈铭明卢树峰杨世海骆翻钿李振华朱晓龙田正其崔林
Owner STATE GRID CORP OF CHINA
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