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Resonance grounding system single-phase earth fault section positioning method

A single-phase grounding fault and resonant grounding technology, applied in the fault location, detecting faults according to conductor types, instruments, etc., can solve the problems that the signal injection method is susceptible to transition resistance, limited injection capacity, and influence of line parameters, and achieves reliable performance. High performance, no additional investment, simple principle effect

Active Publication Date: 2018-11-23
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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Problems solved by technology

Since the use of flexible power electronics technology to transform the distribution network is an important trend in the future, and the flexible switchgear (SOP), as a new type of flexible primary device that replaces the traditional tie switch, can use its powerful waveform modulation capability to achieve active fault location The signal injection is used to solve the problems that the zero-sequence current ratio-amplitude method in the traditional fault location method is no longer applicable to the resonant grounding system. The signal injection method is easily affected by the transition resistance and line parameters, and the injection capacity is limited.

Method used

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  • Resonance grounding system single-phase earth fault section positioning method
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  • Resonance grounding system single-phase earth fault section positioning method

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Embodiment

[0053] Figure 4 It is a schematic diagram of a 10kV distribution network simulation model connected with SOP built on the PSCAD simulation platform. The SOP adopts a three-terminal back-to-back two-level voltage source structure, connects three AC systems, and takes AC system 2 as an example to elaborate on the active single-phase ground fault location strategy proposed by the present invention. Among them, T2 is a 35 / 10kV transformer, with delta connection on the 35kV side, and grounding on the 10kV side through the arc suppression coil; along the line are multi-branch AC feeders, and fault indicators are installed at the beginning and end of each branch line to realize the current sampling function. The specific simulation parameters are as follows:

[0054] Equivalent parameters of large system on the back side of transformer T2: equivalent voltage source 35kV, positive sequence reactance 6.45Ω, positive sequence impedance angle 80°.

[0055] The reactance value L of the...

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Abstract

The invention discloses a resonance grounding system single-phase earth fault section positioning method; the method comprises the following steps: forming adaptive criteria according to an inherent amplitude ratio between an inductance current and a capacitance current in a low frequency network, thus effectively determining a fault section; using an excessive compensation effect of an arc extinguishing coil on a low frequency external signal to obtain an inductance current circulation loop that highlights the fault point and an arc extinguishing coil installation portion. The method uses a SOP excellent waveform modulation capability to actively inject the low frequency signal, thus omitting extra investment of a signal injector used by a conventional signal injection method, and enlarging the injection signal capacity; the method is simple in principle, high in reliability, and not affected by a transition resistance, system operation modes and line lengths.

Description

technical field [0001] The invention belongs to the technical field of distribution network fault location, and relates to a fault section location method applicable when a single-phase ground fault occurs in a resonance grounding system connected with a soft openpoint (SOP). Background technique [0002] The small current ground fault location, especially the single-phase ground fault location problem of resonant grounded distribution network, has not obtained a good solution after years of research. Compared with the neutral point ungrounded distribution network, the compensation current of the arc suppressing coil changes the zero-sequence current distribution characteristics of the fault line, making the fault location method based on the zero-sequence current amplitude or phase invalid. [0003] Harmonic method, active component method and other positioning methods based on fault steady-state components, due to the weak fault quantity and the interference of fault arc, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/02
CPCG01R31/086G01R31/50
Inventor 陆翌杨勇许烽王朝亮裘鹏宣佳卓陈骞倪晓军丁超叶雨晴马啸林湘宁李正天
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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