Neutral point grounding impedance device of transformer and multipurpose direct current magnetic bias protection method of impedance device

A transformer neutral point, multi-purpose technology, applied in circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc. It can improve the short-circuit resistance, avoid damage, and suppress the DC bias current.

Inactive Publication Date: 2015-01-28
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and provide a transformer neutral point connection impedance device and a multi-purpose DC bias protection method, which are mainly used for transform

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  • Neutral point grounding impedance device of transformer and multipurpose direct current magnetic bias protection method of impedance device
  • Neutral point grounding impedance device of transformer and multipurpose direct current magnetic bias protection method of impedance device
  • Neutral point grounding impedance device of transformer and multipurpose direct current magnetic bias protection method of impedance device

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Embodiment Construction

[0040] Below in conjunction with embodiment the present invention is described in further detail, but structure of the present invention is not limited to following embodiment:

[0041] Such as figure 1 As shown, the neutral point of the transformer is connected to the impedance device, and the impedance device is set between the neutral point of the transformer and the earth, including the impedance Z and the lightning arrester A, one end of the impedance Z is connected to the neutral point of the transformer, and the other end is grounded, as shown in the figure Transformer T . This device is mainly used on the main transformer in the substation. The impedance Z can suppress the AC and DC currents. The resistance part is used to suppress the DC bias current, and the reactance part is used to weaken the short-circuit current. When installing, it changes the traditional partial grounding method of the substation. (If there are two main transformers, the neutral point of one m...

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Abstract

The invention discloses a neutral point grounding impedance device of a transformer and a multipurpose direct current magnetic bias protection method of the impedance device. The impedance device is arranged between neutral points of all main transformers in a transformer substation and the ground, and comprises an impedor Z, a lightning arrester A and a by-pass switch K; one end of the impedor is connected with a neutral point of the transformer; and the other end of the impedor is grounded. The impedance device has the benefits that the device is mainly used for the transformer substation; the neutral points of the main transformers in the transformer substation are grounded by the impedance device; direct current magnetic bias current can be effectively inhibited; the short-circuit resistance capacity of the transformer is improved; and damage of ground overvoltage to insulation of the neutral point of the transformer is avoided.

Description

technical field [0001] The invention relates to an impedance device, in particular to a transformer neutral point connection impedance device and its multi-purpose DC bias protection method, which can also be used to improve the anti-short circuit capability of the transformer and solve the problem of poor coordination of "gap + lightning arrester" question. Background technique [0002] The DC transmission project can alleviate the problem of unbalanced distribution of load centers and energy centers in my country, but when the DC transmission single-pole ground circuit is running, the DC ground electrode current will cause DC bias such as increased vibration, increased noise, and local overheating of AC transformers in the vicinity. The magnetic phenomenon will cause problems such as loosening of the tightening parts inside the transformer, disconnection of the winding, damage to the insulating material, and loosening and bending of the iron sheet. If the duration is too lo...

Claims

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Application Information

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IPC IPC(8): H02H7/04H02H9/02
Inventor 蒋伟张星海甘德刚
Owner STATE GRID CORP OF CHINA
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