Energy-saving Selection Method of Grounding Resistance of Substation Grounding Transformer
A technology for grounding transformers and grounding resistors, which is applied in the field of energy-saving selection of grounding resistors for substation grounding transformers, can solve problems such as large heat loss, and achieve the effects of prolonging service life and reducing power loss
Active Publication Date: 2016-08-17
STATE GRID CORP OF CHINA +1
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Problems solved by technology
[0004] The invention aims at the problem that the neutral point grounding resistance running heat loss caused by the grounding transformer in the ungrounded system of the power grid in my country is too large, and provides an energy-saving selection method for the grounding resistance of the substation grounding transformer
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[0020] The implementation of the present invention will be described in further detail below in conjunction with the accompanying drawings. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.
[0021] An energy-saving selection method for substation grounding transformer grounding resistance, such as figure 1 shown, including the following steps:
[0022] The first step is to establish a grounding transformer neutral point resistance power loss model; according to the number of substation cable outlets, grounding transformer current break protection, grounding transformer overcurrent protection, neutral point resistance zero sequence protection, and transformer capacity constraints, according to the impedance According to the matching principle, the power loss model of the neutral point resistance of the grounding transformer is obtained:
[0023] P ...
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The invention relates to an energy-saving selection method for the grounding resistance of a substation grounding transformer, which comprises the following steps: the first step is to establish the neutral point resistance power loss model of the grounding transformer; The final value of the resistance is determined; the margin of 85% of the resistance value of the grounding resistance calculated in the second step is used as the final value of the grounding resistance. The present invention establishes a mathematical model of resistive power loss by analyzing the relationship between the resistance value of the neutral point resistance of the substation grounding transformer and power loss, and proposes an optimal resistance selection method without changing the zero-sequence protection sensitivity of the substation grounding transformer , Realize the energy-saving operation of substation equipment and prolong the service life of grounding equipment.
Description
technical field [0001] The invention belongs to the field of grid planning and design, is applicable to the energy-saving design of grounding resistance of substation grounding transformers, and in particular relates to an energy-saving selection method of grounding resistance of substation grounding transformers. Background technique [0002] The neutral point grounding method of the power system is a comprehensive problem, which is related to the voltage level, single-phase grounding short-circuit current, overvoltage level, protection configuration, etc., and directly affects the insulation level of the power grid, the reliability and continuity of the system power supply , the operation safety of main transformers and generators, and the interference to communication lines, etc. In recent years, with the continuous development of my country's urban power grids, the application of cable lines has continued to increase, and the capacitive currents in the system have also c...
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IPC IPC(8): H02H9/08
Inventor 马力李盛伟毛华何勇张来郭晋芳王潇耿芳范伟黄临存张梅
Owner STATE GRID CORP OF CHINA