Transformer impedance varying method and device

A transformer and variable impedance technology, which is applied in the field of transformer variable impedance, can solve the problems of long maintenance cycle, increased system loss, high maintenance cost, etc., and achieve the effect of accurate and fast switching and solving energy problems

Pending Publication Date: 2019-11-22
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Returning the transformer to the factory for overhaul can improve the short-circuit impact tolerance level of the transformer to a certain extent, but the maintenance cost is high an

Method used

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  • Transformer impedance varying method and device
  • Transformer impedance varying method and device
  • Transformer impedance varying method and device

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[0069] In order to have a clearer understanding of the technical features, objectives and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0070] Such as figure 1 As shown, the method for changing impedance of a transformer according to the present invention includes the following steps:

[0071] 101. After connecting the breaking module 1 and the current limiting module 2 in parallel with each other, connect them in series to the high-voltage side incoming line of the transformer;

[0072] 102. When the current mutual inductance module 8 determines that the transformer circuit is short-circuited, the breaking module 1 opens the circuit, so that the current limiting module 2 cooperates with the transformer winding to complete short-circuit current limitation;

[0073] 103. When the current mutual inductance module 8 determines that the transformer circuit is normal, the bre...

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Abstract

The invention relates to the technical field of transformer line equipment, in particular to a transformer impedance varying method and device. The method comprises the steps: enabling an on-off module and a current limiting module to be connected in parallel, and then to be connected to a high-voltage side incoming line of a transformer in series; when a current mutual inductance module judges that the transformer line is short-circuited, disconnecting the on-off module so that the current limiting module is matched with the transformer winding to complete short-circuit current limiting; andwhen the current mutual inductance module judges that the transformer line is normal, closing the on-off module so that the current limiting module is short-circuited. According to the method and thedevice, short-circuit current can be suppressed, and loss of the transformer line is not increased.

Description

technical field [0001] The invention relates to the technical field of transformer line equipment, and more specifically, to a method and a device for changing impedance of a transformer. Background technique [0002] The power transformer is one of the important power transmission and transformation equipment in the power system. It connects multiple voltage levels and plays a pivotal role in the power grid. The safety and reliability of its operation directly affects the operation safety of the power grid, and improving the operation reliability of the transformer is of great significance to the safe and reliable operation of the entire power grid. However, with the increasing scale of the power grid, the short-circuit capacity and short-circuit current are also increasing, so there are more and more transformer damage accidents caused by the impact of short-circuit fault current, which seriously threatens the safe operation of transformers. It is necessary to improve the...

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Application Information

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IPC IPC(8): H02H9/02H02H7/04
CPCH02H7/04H02H9/021
Inventor 卢文华李穆曹磊
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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