Setting calculation method for bus differential protection current loop line disconnection alarm fixed value

A busbar differential protection and current loop technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as unreasonable setting and frequent occurrence of alarm signals of busbar current loop disconnection in substations

Active Publication Date: 2016-07-06
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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Problems solved by technology

[0003] The invention provides a setting calculation method for the disconnection alarm setting value of the differential protection current loop of the substation busbar, which solves the current problem caused by the unrea

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  • Setting calculation method for bus differential protection current loop line disconnection alarm fixed value
  • Setting calculation method for bus differential protection current loop line disconnection alarm fixed value
  • Setting calculation method for bus differential protection current loop line disconnection alarm fixed value

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Embodiment Construction

[0035] The present invention is described in detail below:

[0036] A method for setting and calculating a disconnection alarm setting value of a bus differential protection current loop, comprising the following steps:

[0037] The first step is to sort the N-circuit transmission lines connected to the same busbar of the substation. The parameters of the first transmission line are represented by the subscript I, and the parameters of the second transmission line are represented by the subscript II, and so on. The parameters of the Nth transmission line are represented by the subscript N;

[0038] The second step is to establish the unbalanced current calculation model of each transmission line according to the actual line length of each transmission line connected to the same busbar of the substation, the tower type used and the phase sequence arrangement of the conductors of the transmission line;

[0039] The third step, according to the unbalanced current calculation mod...

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Abstract

The invention disclose a setting calculation method for a bus differential protection current loop line disconnection alarm fixed value, which solves the problem that the current loop line disconnection alarm signal of the transformer substation bus protection frequently happens due to the fact that the current transformer substation bus differential protection current loop line disconnection alarm fixed value is not reasonable. The setting calculation method comprises steps of establishing an imbalance current calculation model of a power transmission circuit according to the usage tower types, the lead phase sequence arrangement and the line length of all power transmission circuits which are connected to one bus of the transformer substation, calculating the positive sequence current, the negative sequence current and the zero sequence current of each loop of the power transmission circuit and the imbalance degree of the zero sequence current, performing actual measurement on the secondary zero sequence imbalance current of all power transmission lines after the transformer substation is in operation, and performing adjustment on the bus protection current loop line disconnection alarm fixed value according to whether the degree of imbalance of the zero sequence current is not greater than 5%. The setting calculation method overcomes the frequent actions of the bus protection current loop line disconnection alarm signal of the transformer station, and guarantees the safety operation of the power grid.

Description

technical field [0001] The invention relates to a method for setting the disconnection alarm setting value of the bus differential protection current loop of a substation, which is suitable for the setting calculation of the disconnection alarm setting value of the bus differential protection current loop connected to the multi-circuit transmission line of the substation bus, so that the substation bus differential It can reliably and accurately send out an alarm signal when the dynamic protection current loop is disconnected. Background technique [0002] With the development of the power grid, according to the different needs of the grid load, a large number of short-distance transmission lines erected without transposition appear in the power grid. The non-transposition erection (or incomplete transposition) of these short-distance transmission lines makes the three-phase current The aggravation of the unbalance has led to the frequent occurrence of disconnection alarms o...

Claims

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Application Information

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IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 张悦潘秀宝宋国兵唐震白瑞杨华张进张友富宋胜利李彪王洪王欣伟续建国王小琪朱良肄王浩杨林也董理科吴明锋孙立时张卫东赵江涛高清平
Owner ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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