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Single-phase ground fault voltage arc extinction method of neutral point ungrounded system and system

A technology of ungrounded neutral point and single-phase ground fault, which is applied to emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage to achieve broad market application prospects and ensure personal and equipment safety , easy-to-control effects

Active Publication Date: 2017-11-07
STATE GRID HUNAN ELECTRIC POWER +1
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Problems solved by technology

[0004] One of the purposes of the present invention is to provide a single-phase ground fault voltage arc suppression method for ungrounded neutral point systems that can solve the problem of arc suppression coil capacity, and can quickly realize voltage arc suppression, and the method is simple and reliable

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  • Single-phase ground fault voltage arc extinction method of neutral point ungrounded system and system
  • Single-phase ground fault voltage arc extinction method of neutral point ungrounded system and system
  • Single-phase ground fault voltage arc extinction method of neutral point ungrounded system and system

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Embodiment Construction

[0033] Such as figure 1 Shown is the method flowchart of the method of the present invention: the single-phase ground fault voltage arc suppression method of the neutral point ungrounded system provided by the present invention comprises the following steps:

[0034] S1. In the neutral point ungrounded system, the impedance adjustable elements (including switching switches, adjustable Adjustable resistor, adjustable inductance and current transformer. The current transformer is connected in series with the switching switch to detect the current flowing through the impedance adjustable element. After the adjustable resistor and adjustable inductance are connected in parallel, they are switched in series. The switch is connected to the three-phase bus); the specific structure is as follows figure 2 As shown; after the impedance adjustable element is connected in series, the impedance adjustable element is disconnected from the three-phase bus (specifically, the switching switc...

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Abstract

The invention discloses a single-phase ground fault voltage arc extinction method of a neutral point ungrounded system. The method includes the steps of connecting impedance adjustable elements in series, measuring and storing the to-ground total admittance of the system and the to-ground admittance of a three-phase line in real time, calculating admittance compensation voltage arc extinction conditions during faults, and adjusting the parameters of the impedance adjustable elements to complete arc extinction. The invention further discloses a system for implementing the single-phase ground fault voltage arc extinction method of the neutral point ungrounded system. By means of the brand-new arc extinction method, voltage arc extinction is conducted on the single-phase ground faults of the neutral point ungrounded system, and the physical safety and device safety of fault points are ensured; meanwhile, the capacity problem of arc extinction coil grounding and the problem that active components can not be compensated for can be solved, and the problem that effective arc extinction can not be achieved for the low-resistance ground fault of a fast-transfer switch arc extinction device is solved; finally, an existing mature independent device can be used for comprehensively realizing the research and development of an arc extinction device, control is easy, and thus wide market application prospects are achieved.

Description

technical field [0001] The invention specifically relates to a single-phase ground fault voltage arc suppression method and system for a neutral point ungrounded system. Background technique [0002] With the development of my country's economy and technology and the improvement of people's living standards, electric energy has become an indispensable secondary energy source in people's production and life, bringing endless convenience to people's production and life. However, power system failures bring great challenges to the power system. Ungrounded neutral point and grounded neutral point through arc suppression coil are the two most commonly used grounding methods in my country's distribution network. With the development of the distribution network, the capacity of the arc suppression coil cannot keep up with the capacity of the distribution network. Therefore, it is necessary to study a new neutral point grounding method to adapt to the development of the power grid....

Claims

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Application Information

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IPC IPC(8): H02H9/08
CPCH02H9/08
Inventor 赵军容展鹏卢彦西段娟凤邓杰文邹志华黄相茁陈振宇蒋槟国柏衡祁
Owner STATE GRID HUNAN ELECTRIC POWER
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