A Type Selection Method for Neutral Grounding Transformer of Large Generator
A technology of neutral point grounding and grounding transformation, applied in the direction of electrical components, circuit devices, emergency protection circuit devices, etc., can solve the problems that the injection component is difficult to measure accurately, the power frequency component cannot be completely filtered out, etc., to improve the protection performance , Improving the effect of measuring resistance accuracy
Active Publication Date: 2019-08-23
NARI TECH CO LTD
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Problems solved by technology
[0004] The invention provides a type selection method for the neutral point grounding transformer of a large generator, which solves the problems that the injection component is difficult to accurately measure and the power frequency component cannot be completely filtered out when a single-phase ground fault occurs in the stator winding of the unit
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[0027] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, but not to limit the protection scope of the present invention.
[0028] A method for selecting the neutral point grounding transformer of a large generator, the specific process is as follows:
[0029] 1) Set the rated voltage of the primary side of the grounding transformer to the rated line voltage of the unit.
[0030] 2) According to the PT / CT constraints, filter constraints, withstand voltage constraints and unit safety operation constraints of the grounding resistance protection device, determine the rated voltage of the secondary side of the grounding transformer, that is, the rated voltage of the secondary side of the grounding transformer after determination The voltage satisfies all the above constraints.
[0031] After the rated voltage of the s...
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The invention discloses a method for type selection of a grounding transformer for a large power generator neutral point. According to the PT / CT constraint condition, the filter constraint condition,the withstand voltage constraint condition and the unit safety operation constraint condition of a grounding resistance protecting device, the secondary side rated voltage of the grounding transformeris determined; and the secondary load resistance of the grounding transformer is determined through the secondary side rated voltage of the grounding transformer, and type selection of the groundingtransformer is completed, so that filtering of injected fundamental frequency components and accurate measuring of the injected components are facilitated, the grounding resistance protecting device operates safely and reliably, a unit operates safely and reliably, accordingly, resistance measuring precision is improved, and the grounding resistance protecting property is improved.
Description
technical field [0001] The invention relates to a type selection method for a neutral point grounding transformer of a large generator, belonging to the field of automatic control of electric power systems. Background technique [0002] At present, the neutral point of large generator sets at home and abroad mainly adopts the grounding method through the grounding transformer, and the stator winding grounding protection mostly adopts the stator grounding protection of the external power injection type, and the injection component is injected from the neutral point of the unit. This protection is composed of grounding resistance protection and power frequency zero-sequence grounding overcurrent protection. The protection ranges of the two protections overlap without dead zone, and 100% stator grounding protection is realized. [0003] When a single-phase ground fault occurs in the stator winding of the unit, it can be known from the equivalent circuit of the injection compone...
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IPC IPC(8): H02H1/00H02H7/06
Inventor 李蔚吴崇昊李志坚郑作伟郝后堂郑玉平
Owner NARI TECH CO LTD