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Distribution network mixed connection grounding operation capacitive current measurement method and system

A technology of capacitive current and measurement method, which is applied in the direction of measurement device, measurement of electrical variables, measurement of current/voltage, etc., can solve the problem of increasing measurement error, and achieve the effect of high accuracy, accurate measurement, and guaranteed compensation effect.

Active Publication Date: 2017-06-06
STATE GRID CORP OF CHINA +2
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Problems solved by technology

In this case, the two-point method and the resonance method, which are widely used to measure the capacitive current of the turn-adjusting arc suppression coil, will cause large measurement errors due to changes in the equivalent circuit.

Method used

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  • Distribution network mixed connection grounding operation capacitive current measurement method and system
  • Distribution network mixed connection grounding operation capacitive current measurement method and system
  • Distribution network mixed connection grounding operation capacitive current measurement method and system

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Embodiment Construction

[0032] like figure 1 As shown, the implementation steps of the capacitive current measurement method for the mixed-connection operation of the distribution network in this embodiment include:

[0033] 1) Collect the neutral point displacement voltage and neutral point current of the distribution network, and obtain the grounding resistance R of the hybrid grounding system of the distribution network. The hybrid grounding system of the distribution network includes parallel arc suppression coils and resistances;

[0034] 2) Collect the neutral point displacement voltage and arc suppression coil current of the arc suppression coil in different gears, and calculate the capacitive impedance Z of the hybrid grounding system of the distribution network according to the neutral point displacement voltage, arc suppression coil current and grounding resistance R C ;

[0035] 3) According to the phase voltage U of the distribution network n Divided by the capacitive impedance Z of the...

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Abstract

The invention discloses a distribution network mixed connection grounding operation capacitive current measurement method and system. The method comprises the steps that neutral point displacement voltage and neutral point current of a power distribution network are acquired, grounding resistance of a power distribution network mixed grounding system is obtained, neutral point displacement voltage and arc suppression coil current of an arc suppression coil at different gears are acquired, and the capacitive impedance of the power distribution network mixed grounding system is calculated according to the neutral point displacement voltage, the arc suppression coil current and the grounding resistance; and the capacitive current of distribution network mixed connection grounding operation is obtained according to the result of dividing the phase voltage of the power distribution network by the capacitive impedance of the power distribution network mixed grounding system. The system comprises a grounding resistance calculation program module, a capacitive impedance calculation program module and a capacitive current calculation program module. Improvement is performed on the basis of an arc suppression coil grounding system measuring the capacitive current by using a two-point method so that accurate measurement of the capacitive current of distribution network mixed connection grounding operation can be realized, and the method and the system have the advantages of being novel in thinking, clear in flow and high in accuracy.

Description

technical field [0001] The invention relates to a capacitance current measurement technology of a distribution network, in particular to a capacitance current measurement method and a system for the mixed connection operation of the distribution network. Background technique [0002] With the continuous expansion of the urban distribution network and the large-scale use of power cables in the urban distribution network, the single-phase grounding fault current of the distribution network increases sharply. The sharp increase of capacitive current makes it difficult to extinguish the grounding arc during the fault, and the arc overvoltage generated by it is easy to cause the occurrence of two-phase short-circuit fault, resulting in the expansion of the fault. Therefore, the capacitor current must be limited. For a distribution network, should arc suppression coils be installed? What capacity arc suppression coil should be installed? The precondition is to know the magnitud...

Claims

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Application Information

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IPC IPC(8): G01R19/00
CPCG01R19/00
Inventor 汪霄飞任章鳌李欣
Owner STATE GRID CORP OF CHINA
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