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Phase difference principle based power distribution network differential protection method

A differential protection and phase difference technology, which is applied in the direction of automatically disconnected emergency protection devices, emergency protection circuit devices, electrical components, etc., to achieve the effects of fast protection action, poor quick movement and high accuracy

Active Publication Date: 2015-12-09
XJ ELECTRIC +3
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  • Abstract
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  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to provide a distribution network differential protection method based on the phase difference principle to solve the problem of many disadvantages in the traditional distribution network differential protection

Method used

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  • Phase difference principle based power distribution network differential protection method
  • Phase difference principle based power distribution network differential protection method
  • Phase difference principle based power distribution network differential protection method

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0028] Such as figure 1 As shown, each load switch is equipped with a feeder intelligent terminal, wherein the intelligent terminal collects the current and voltage signals at the load switch through the transformer, and the intelligent terminal realizes the protection action through the circuit breaker. The distribution network wide-area differential protection control system is composed of a device with highly integrated hardware and software modules, and the distribution network wide-area differential protection control system is equipped with a Gigabit optical Ethernet port, and each intelligent terminal passes through a high-speed optical fiber The Ethernet is connected to the Gigabit optical Ethernet port of the differential protection control system. All feeder intelligent terminals in the distribution network realize data information interaction thro...

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Abstract

The invention relates to a phase difference principle based power distribution network differential protection method. Current and voltage signals at each load switch are acquired; a phase difference of currents corresponding to two adjacent load switches is calculated, wherein at least one of the two adjacent load switches meets a condition that delta I phi max>n.delta IT+delta Idz; and if the phase difference of the currents corresponding to certain two adjacent load switches is greater than a set threshold value, then a section between the two adjacent load switches is a fault section, and the two adjacent load switches are tripped off. According to the method, only the phase difference of the currents at the two adjacent load switches needs to be calculated; fault determination is realized according to the condition met by the phase difference; the method has low requirement on data synchronization; the fault determination can be performed according to acquired information; the time required for the whole determination process is very short; the protection action speed is high; and the problem of low action speed in an existing relay protection method for a power distribution network is solved.

Description

technical field [0001] The invention relates to a distribution network differential protection method based on the phase difference principle, and belongs to the technical field of distribution network differential protection. Background technique [0002] For a long time, the construction of my country's medium and low-voltage distribution network lags far behind the high-voltage transmission system, and there are problems such as weak grid structure and low automation level. As more and more distributed photovoltaic power sources are connected to the distribution network, it is bound to have a profound impact on the existing relay protection and automation of the distribution network. It is urgent to further improve the new principle of relay protection of the distribution network and improve the relay protection. performance. [0003] At present, the distribution network is equipped with active defense current protection and passive master station type distribution autom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02J13/00
CPCG05F1/66G05B15/02H02H3/265
Inventor 牛强梁经宛姜帅邱俊宏贾华伟李萌高磊陶永健刘永欣李峰董新涛席亚克李栋李新玲
Owner XJ ELECTRIC
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