Self-adjusting resistor type direct current magnetic bias suppression device

A DC bias suppression, resistive technology, applied in circuit devices, emergency protection circuit devices, emergency protection circuit devices used to limit overcurrent/overvoltage, etc., can solve the problem that the inherent resistance cannot adapt to the neutral bias Move, consume a lot of manpower and material resources, etc., to achieve the effect of ensuring accurate action and reducing current

Pending Publication Date: 2022-07-29
湖州电力设计院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the grid structure changes, the DC bias magnetic field will change significantly. However, the intrinsic resistance cannot adapt to the neutral point offset caused by the bias magnetic field, so it cannot effectively adapt to the DC bias magnetic field caused by the grid change. At the same time, if necessary Manual replacement of the resistor size still requires a lot of manpower and material resources

Method used

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  • Self-adjusting resistor type direct current magnetic bias suppression device
  • Self-adjusting resistor type direct current magnetic bias suppression device
  • Self-adjusting resistor type direct current magnetic bias suppression device

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Embodiment Construction

[0040] It should be understood that the embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0041] The technical solutions of the present invention are further described in detail below through the examples.

[0042] Positive Temperature Coefficient (PTC) material is an n-type semiconductor material that is extremely sensitive to temperature. Its remarkable characteristic is that the resistance value changes with temperature, showing a nonlinear positive temperature coefficient relationship, that is, the resistivity of the material is in the Within a certain temperature range, it is basically unchanged or has on...

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Abstract

The invention discloses a self-adjusting resistor type direct current magnetic bias suppression device. The device is based on a resistor PTCR of a positive temperature coefficient material; when a large current passes through the device, the resistance value of the resistor is increased due to the temperature rise of the resistor body, so that the current is limited in a small range, the direct current magnetic bias of the transformer is inhibited, the function of reversely and automatically adjusting the current is achieved, and the defect that the treatment effect of a resistance type direct current magnetic bias device is unstable can be perfectly overcome.

Description

technical field [0001] The invention relates to the field of transformer DC bias suppression, in particular to a self-adjusting resistance type DC bias suppression device. Background technique [0002] Due to the unique advantages of HVDC transmission in long-distance, large-capacity transmission and grid interconnection, since the first ultra-high voltage ±500kV Gezhouba-Nanqiao HVDC transmission project was built in 1989, the current ultra-high voltage DC transmission projects put into operation in my country There are more than 20 lines. [0003] When one pole of the DC project fails or exits due to maintenance, the other pole is often operated in the mode of single pole ground return. At this time, the DC current enters the ground through the grounding electrode at one end, and returns to the grounding electrode at the other end using the earth soil. When the DC current is injected into the earth, a potential difference will be formed in the soil around the grounding el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H02H9/06H02H9/08H02H7/04
CPCH02H9/026H02H9/06H02H9/08H02H7/04
Inventor 赵崇娟胡钰莹严雪莹
Owner 湖州电力设计院有限公司
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