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110/220 kv transformers' neutral point grounding via small reactance

A transformer neutral point, small reactance technology, applied in emergency protection circuit devices, instruments, electrical components, etc. used to limit overcurrent/overvoltage, can solve the problem of real-time simulation technology of dynamic mode and no systematic analysis of transformers. Influence factors of neutral point current and voltage, etc.

Inactive Publication Date: 2012-02-22
ZIYANG POWER SUPPLY COMPANY STATE GRID SICHUAN ELECTRIC POWER
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Problems solved by technology

The problem caused by this grounding method is: in a local area, once the neutral point is directly grounded and the transformer is out of operation for some reason, the local area will become a neutral point ungrounded system
The existing lightning arrester plus gap protection method can not meet the requirements of insulation coordination, and a new method is needed to solve this problem
[0004] Most of the neutral points of 110kV and 220kV systems in my country adopt effective grounding methods. There are also some researches on the neutral point grounding methods through small reactances, but there is no real-time simulation technology based on RTDS. The highest overvoltage at the neutral point and the current limiting capability of the small reactance; there is no systematic analysis of the research on the influence factors of the neutral point current and voltage after the neutral point of the transformer is grounded through the small reactance, including: reactance value, the number of transformers in parallel operation, Bus short-circuit capacity, system-side zero-sequence impedance and low-voltage side power supply; the reliability of this grounding method has not been tested through long-term trial operation

Method used

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  • 110/220 kv transformers' neutral point grounding via small reactance
  • 110/220 kv transformers' neutral point grounding via small reactance
  • 110/220 kv transformers' neutral point grounding via small reactance

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Embodiment Construction

[0030] Provide a small reactance grounding model based on a 110 / 220kV transformer, which is characterized in that it includes a busbar, n transformers (n≥2) connected in parallel to the busbar, each transformer is grounded through a small reactance connected to its neutral point, Each small reactance is equipped with a switch connected in parallel with it. When the switch is closed, the neutral point of the transformer is directly grounded through the switch. According to the national standard GB1094.5--2003 on the conditions for the transformer to be connected to the power grid, based on the dynamic real-time simulation technology of RTDS, Calculate the highest overvoltage of the neutral point and the current limiting capacity of the small reactance after the 110kV transformer is grounded by a small reactance. The three-phase short-circuit capacity is 9000MVA / 126kV as the condition for assessing the short-circuit impact of the 110kV transformer winding. In order to enable the...

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Abstract

The invention relates to a method of 110 / 220 kV transformers' neutral point grounding via a small reactance. According to the invention, a movable mold real-time simulation technology based on an RTDS is employed to calculate highest overvoltages of neutral points of 110 / 220 kV transformers and current limiting capacity of a small reactance after grounding of the 110 / 220 kV transformers via the small reactance; influence factors of a current and a voltage of the neutral point after the transformers' neutral point grounding via the small reactor are studied comprehensively; and a selection method for a grounding small reactance resistance, a theoretical research for realizing the method and practical application thereof are described.

Description

technical field [0001] The invention relates to a method for grounding the neutral point of a transformer through a small reactance. Based on the real-time simulation technology of dynamic model of RTDS, the highest overvoltage of the neutral point and the current limiting capacity of the small reactance of the 110kV / 220kV transformer after being grounded through a small reactance are calculated; comprehensive research on the transformer After the neutral point is grounded by a small reactance, the influencing factors of the neutral point current and voltage; and the selection method of the resistance value of the small reactance, the theoretical research and practical application of this method Background technique [0002] At present, most of the 110kV / 220kV power grids in my country adopt the neutral point grounding method of some transformers. The problem caused by this grounding method is that once the neutral point directly grounded transformer is out of operation for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04H02H9/08G06F17/50
Inventor 张星海张苏川甄威欧居勇廖文礼王祥东徐斌
Owner ZIYANG POWER SUPPLY COMPANY STATE GRID SICHUAN ELECTRIC POWER
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