The Method of Limiting the Displacement Voltage of Generator's Neutral Point

A technology of generator voltage and displacement voltage, which is applied to emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, to reduce design and manufacturing costs, suppress neutral point displacement voltage, and improve safety The effect of stability

Active Publication Date: 2022-03-15
CHANGJIANG SURVEY PLANNING DESIGN & RES
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Problems solved by technology

Since there is currently no suppression measure for the neutral point displacement voltage of the generator, it is generally required that the three-phase stator windings of the generator be as balanced as possible to the ground capacitance, but the ground capacitance of the three-phase windings of the generator cannot be completely equal. Therefore, the generator neutral point Voltage displacement is inevitable

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  • The Method of Limiting the Displacement Voltage of Generator's Neutral Point
  • The Method of Limiting the Displacement Voltage of Generator's Neutral Point
  • The Method of Limiting the Displacement Voltage of Generator's Neutral Point

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Embodiment Construction

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not limit the present invention.

[0041] The reason for the high neutral point displacement voltage is that the three phase-to-ground capacitances of the generator stator windings are not equal. Based on this, supplementary capacitance in the generator stator circuit makes the three-phase capacitance values ​​balanced. details as follows:

[0042]

[0043] In the formula, C A0 、C B0 、C C0 are the compensation capacitors of the three-phase circuits of the generator stator, and the capacitors of the three-phase stator circuits (C A +C A0 )≈(C B +C B0 )≈(C C +CC0 ), realize the capacitance balance of the three-phase circuit of the stator, so as to realize At the same time, due to the additional capacitance, it is equivalent to increasing the denominator t...

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Abstract

The invention provides a generator neutral point displacement voltage limiting method, comprising the following steps: after the generator voltage circuit is installed, measure the generator three-phase stator circuit voltage and the current neutral point displacement voltage in real time; The difference between the maximum value and the minimum value among the three-phase stator circuit capacitances determines the capacitance that needs to be supplemented by the three-phase stator circuit; according to the determined supplementary capacitance of the three-phase stator circuit and the above-mentioned capacitance parameter setting requirements, the capacitor type is selected; clear After the capacitor, install the capacitor at the designated position; after the installation, measure the neutral point displacement voltage of the compensated three-phase stator circuit capacitance of the generator in real time to check whether the requirements are met; if the requirements are not met, repeat the above steps until Meet owner or standard requirements. The invention effectively suppresses the neutral point displacement voltage of the generator.

Description

technical field [0001] The invention relates to the technical field of generators, in particular to a method for limiting the neutral point displacement voltage of a generator. Background technique [0002] Generator neutral point displacement voltage means that the neutral point of the generator has a certain ground potential during the operation of the generator. In the generator set, there is a common problem that the neutral point displacement voltage is too high. According to "GB / T 15543-2008 Power Quality Three-phase Voltage Unbalance", the neutral point displacement voltage shall not exceed 10% of the phase voltage of the generator. Excessive neutral point displacement voltage will cause protection malfunction and affect the safe and stable operation of the generator. Therefore, in the actual operation process, the neutral point displacement voltage is generally controlled to be small; if the value is too high, the power generation company will pay attention to this...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/04H02H7/06
CPCH02H9/04H02H7/06
Inventor 朱钊刘亚青梁波王树清董芳华曾江华陈晓明
Owner CHANGJIANG SURVEY PLANNING DESIGN & RES
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