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Judgment method for virtual connection of secondary loop neutral line of power grid voltage transformer

A grid voltage, secondary circuit technology, used in electrical connection testing, instruments, measuring electricity and other directions to achieve the effect of improving rapidity and accuracy

Active Publication Date: 2019-01-11
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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Problems solved by technology

[0003] The invention provides a method for judging the virtual connection of the neutral line of the secondary circuit of the voltage transformer of the power grid, and solves the technical problem of how to accurately judge the virtual connection of the two neutral points

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  • Judgment method for virtual connection of secondary loop neutral line of power grid voltage transformer
  • Judgment method for virtual connection of secondary loop neutral line of power grid voltage transformer
  • Judgment method for virtual connection of secondary loop neutral line of power grid voltage transformer

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] The method for judging the virtual connection of the neutral line of the secondary circuit of the voltage transformer of the power grid includes the following steps:

[0020] The first step is to connect the input side of the secondary measurement device of the star solution with the output terminal of the secondary side star winding of the grid voltage transformer, and connect the neutral point of the input side of the secondary measurement device to the grid voltage mutual inductance The neutral point of the secondary side of the transformer is connected together through the neutral line, and according to the "GBT 14549-1993 Power Quality Public Grid Harmonics" standard, the allowable third harmonic voltage corresponding to the voltage level of the grid connected to the grid voltage transformer is obtained Distortion rate L, and calculate E according to the fo...

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Abstract

The invention discloses a judgment method for virtual connection of secondary loop neutral line of a power grid voltage transformer, which solves the problem that how to accurately determine the virtual connection of two neutral points. The method comprises the following steps of: connecting the input side of a secondary measuring device of a star-shape solution with the output end of the secondary side star-shape winding of the grid voltage transformer, and connecting the neutral point of the input side of the secondary measuring device with the neutral point of the secondary side of the gridvoltage transformer through the neutral line; and calculating a measurement error according to the measurement precision T and the measuring range of the secondary measurement device, simultaneouslymeasuring the three-phase instantaneous voltage on the secondary side of the secondary measurement device, subtracting the measurement error to obtain the third harmonic voltage true value of the primary side of the secondary measuring device, after multiplying a zero-sequence third harmonic voltage effective value by the ratio of the secondary measuring device input the transformer, and determining whether the secondary loop neutral line of the power grid voltage transformer has the virtual connection phenomenon. According to the judgment method for the virtual connection of the secondary loop neutral line of the power grid voltage transformer, the rapidness and the accuracy for determining the virtual connection of the neutral line of the secondary voltage loop are improved.

Description

technical field [0001] The invention relates to a method for judging the virtual connection of a neutral line of a secondary voltage circuit of a voltage transformer in a power grid, belonging to the field of power system protection. Background technique [0002] The grid voltage transformer is an instrument and equipment used to transform the line voltage. For the windings whose secondary side of the grid voltage transformer is star-connected, it is required that the primary side of the input transformer of the secondary measurement device is also star-connected. The neutral point of the secondary side of the grid voltage transformer is required to be connected with the neutral point of the primary side of the input transformer of the secondary measurement device, and one point of grounding must be achieved. In the field measurement process, sometimes the connection between the two neutral points will be falsely connected, which may easily cause the protection device to mal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/04
CPCG01R31/67
Inventor 杨赟磊张渊张世锋常潇雷达王金浩李胜文李慧蓬张敏王锬樊瑞刘翼肇赵军
Owner ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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