Rapid switching mode variable impedance transformer adaptive current protection method

A fast switching and current protection technology, which is applied in the direction of automatic disconnection emergency protection devices, emergency protection circuit devices, electrical components, etc.

Inactive Publication Date: 2017-05-31
STATE GRID CORP OF CHINA +3
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  • Description
  • Claims
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Problems solved by technology

Although these two schemes can play a role in limiting the short-circuit cu

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  • Rapid switching mode variable impedance transformer adaptive current protection method
  • Rapid switching mode variable impedance transformer adaptive current protection method
  • Rapid switching mode variable impedance transformer adaptive current protection method

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Embodiment Construction

[0022] The invention proposes the concept of a novel variable impedance transformer. The new transformer can limit the short-circuit current without causing problems such as large energy loss, large occupied area, and huge transformation workload. The invention analyzes in detail the sensitivity of the overcurrent protection of the novel variable impedance transformer, and uses PSCAD software for simulation verification. The invention proposes a new method capable of solving the insufficient sensitivity of traditional protection: self-adaptive current protection. By monitoring the operation mode of the system online and checking the type of fault, adjust the setting value of the protection setting current to meet the requirements of protection sensitivity.

[0023] One of the purposes of the present invention is to judge and analyze the current transient process of the variable impedance transformer when a fault occurs, and analyze the sensitivity of the overcurrent backup pr...

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Abstract

The invention relates to a rapid switching mode variable impedance transformer adaptive current protection method, characterized by comprising the following steps: 1) measuring the real-time three-phase voltages Ua, Ub, and Uc as well as the three-phase currents Ia, Ib and Ic at the wire inlet end of the transformer; then, using the symmetrical component method to convert the A-phase voltage and current, B-phase voltage and current and C-phase voltage and current into positive/negative zero-sequence voltages and currents; and 2) using the fault component method; based on the positive/negative zero-sequence voltages and currents in the normal state and the positive/negative zero-sequence voltages and currents in the fault state, calculating the fault components of the positive/negative zero-sequence voltages and currents. The protection method, through the real-time rectification of the current values, can meet the requirement for the sensitivity of a backup protection system so as to well address the problem that traditional protection is insufficient in sensitivity.

Description

technical field [0001] The invention relates to a method for self-adaptive current protection of a fast switching variable impedance transformer. Background technique [0002] In recent years, with the continuous development of the power system, the capacity of the power grid is also increasing, which will lead to an increase in the short-circuit current when a short-circuit fault occurs on the line. If the excessively high short-circuit current is not limited, it will not only greatly increase the equipment investment of the substation, but also cause great interference and harm to the system's lines and communication equipment. [0003] At present, there are mainly two traditional schemes for limiting short-circuit current: high-impedance transformer scheme and external current-limiting reactor scheme. Although these two schemes can play a role in limiting the short-circuit current, there are still various deficiencies in the actual operation process. Contents of the in...

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Application Information

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IPC IPC(8): H02H7/26H02H3/00
CPCH02H3/006H02H7/26
Inventor 艾绍贵卢文华樊益平马奎焦在滨郝志国李江涛王曙鸿摆存曦王博吴旭涛高峰孙丽琼杜玮沈黎明车俊禄丁培王银明李秀广
Owner STATE GRID CORP OF CHINA
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