Method for preventing generator stator ground protection malfunction at grid side failure time
A generator stator and grounding protection technology, which is applied in the direction of controlling generators, electrical components, control systems, etc., can solve the problems of failure to find the cause and treatment method, generator stator grounding protection misoperation, etc., to avoid abnormal The effect of stopping and preventing malfunction
Active Publication Date: 2013-10-09
STATE GRID CORP OF CHINA +1
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Problems solved by technology
Similar to the above-mentioned example, the problem of the ground fault on the high-voltage side of the main transformer of the power plant and the malfunction of the generator stator ground protection has not been found for a long time. The cause of the fault and the treatment method
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Embodiment Construction
[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0025] Embodiment (Taking the analysis and detection of stator grounding protection malfunction analysis and detection in Dezhou Power Plant as an example)
[0026] The present invention analyzes the example of solving the ground fault of the main transformer high-voltage side and the generator stator ground protection malfunction tripping, and demonstrates the detection method for finding the fault, and the reason for the generation and increase of the zero-sequence voltage in determining that there is no ground fault in the generator stator , and determine the cause of protection misoperation by detecting generator parameters and calculating the matching of system parameters, and the work done in establishing a reasonable index system.
[0027] Use the high voltage test equipment on site to measure the capacitance of the generator to ground X C And t...
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The invention discloses a method for preventing generator stator ground protection malfunction at grid side failure time. The method comprises the following steps: (1) setting the parameter of a neutral point compensation reactor of a generator, and destroying the resonance conditions of capacitance and inductance of the generator; (1) adjusting motion logics of generator stator voltage protection, enabling signals to be sent at set value when voltage is low, and tripping at set value when voltage is high; (3) adjusting the setting value of generator stator grounding zero sequence voltage protection; (4) adjusting criteria of a generator excitation regulator, and instantly withdrawing forced excitation orders after generator terminal voltage is recovered. The problem of generator stator ground protection malfunction at the grid side failure time can be solved as long as the four steps play roles jointly. The original characteristics of the generator stator ground protection are not influenced after the measures are taken. The problem of malfunction at the grid side failure time is thoroughly solved. The method plays an important role in ensuring the normal operation of a power grid.
Description
technical field [0001] The invention relates to a method for preventing malfunction of the generator stator grounding protection, in particular to a method for preventing malfunction of the generator stator grounding protection when a power grid side fault occurs. Background technique [0002] In Dezhou Power Plant, Liaocheng Power Plant, and Lubei Power Plant, there have been accidents in which generator stator grounding protection malfunctioned, switches tripped, and units stopped. [0003] For example, on February 3, 2012, when there was heavy snowfall in Dezhou area, the C-phase grounding knife switch 5041637-C pillar insulator on the high-voltage side of the main transformer of unit #6 in Dezhou Power Plant broke down the insulation to ground, and a single-phase ground fault occurred, and the 500kV side of unit #6 was short Lead wire protection action, 5041, 5042, and 6MK switches trip; at the same time #4 unit 3U 0 The stator grounding protection action, 5022, 5023 an...
Claims
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Inventor 苏文博李磊王昕孙健张国辉张青青刘延华吕强
Owner STATE GRID CORP OF CHINA