A method and device for measuring capacitive current in a neutral point ungrounded system

A technology of ungrounded neutral point and system capacitance, which is applied in the field of capacitive current measurement of ungrounded neutral point system, and can solve the problem of inaccurate measurement of capacitive current in ungrounded system

Active Publication Date: 2020-06-30
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0004] This application provides a method and device for measuring capacitive current in a neutral point ungrounded system to solve the problem of inaccurate measurement of capacitive current in an ungrounded neutral point system in the prior art. This method has a high measurement signal strength and ensures measurement accuracy. And the safety is good, easy to realize and engineering application, and based on this method, an independent capacitive current measuring device can be manufactured

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  • A method and device for measuring capacitive current in a neutral point ungrounded system
  • A method and device for measuring capacitive current in a neutral point ungrounded system
  • A method and device for measuring capacitive current in a neutral point ungrounded system

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[0029] see figure 1 , which is a flowchart of a capacitive current measurement method for a neutral point ungrounded system of the present application;

[0030] Depend on figure 1 It can be seen that the present application provides a method for measuring capacitive current in a neutral point ungrounded system, the method comprising:

[0031] S10: Obtain any line voltage U when the system is in normal operation S , neutral point voltage E 0 ; First, make the system run normally, and measure any line voltage U by setting a voltage measuring device on the system bus S , and a neutral point voltage E in this state is measured by a voltage measuring device set between the neutral point and the ground 0 ;

[0032] S20: output detection current, obtain detection current I t ; The output current direction of the controllable current source is the output detection current I in the direction of the system t , at the same time, read the current through the current detection devic...

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Abstract

The invention discloses a capacitive current measurement method and device for an ungrounded neutral system. The method comprises steps: any line voltage US and neutral point voltage E0 under normal operation of the sytem are acquired; detection current is outputted, and detection current It is acquired; neutral point voltage E1 after the detection current It is outputted is acquired, and output of the detection current It is stopped; and the capacitive current Ic of the system is calculated. The device includes a current output unit 1, a control unit 2 and a grounding transformer 3, wherein the control unit 2 comprises a current output control unit 21 and a voltage detection unit 22. According to the capacitive current measurement method and device for the ungrounded neutral system provided by the embodiment of the invention, the calculation is easier and more convenient to implement, realization is easy, and the calculation accuracy is high.

Description

technical field [0001] The application is applicable to the technical field of capacitive current measurement, and in particular relates to a method and device for measuring capacitive current in a neutral point ungrounded system. Background technique [0002] In the power grid system, especially in the medium and low voltage distribution network system, the single-phase ground fault accounts for the absolute majority of the total number of faults. When the system capacitive current exceeds a certain value, the grounding arc cannot be extinguished by itself when a single-phase grounding fault occurs, resulting in arc overvoltage and other secondary hazards. [0003] When the capacitive current of the system is large, it is difficult to fully compensate the ground current with a controllable current source alone, which has a large power supply capacity. However, using a controllable current source together with an arc suppression coil for full compensation is not only easy to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/25G01R31/52G01R31/08
Inventor 刘红文王科柴晨超杨庆
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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