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Self-adaptable dicrimination for permanent fault of high-voltage electrical network

A permanent fault, high-voltage power grid technology, applied in the electrical field, can solve problems such as coincidence, and achieve the effect of preventing premature expiration, protecting safety, and ensuring safe and stable operation

Inactive Publication Date: 2005-12-28
XJ ELECTRIC +1
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  • Abstract
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Problems solved by technology

Therefore, for the case where the permanent fault cannot be identified, it is still possible to coincide with the permanent fault. What can be done at present is to reduce the damage to the system by selecting the time of coincidence or the mode of coincidence, but the two ends of the line still need to coincide with each other. permanent failure

Method used

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  • Self-adaptable dicrimination for permanent fault of high-voltage electrical network
  • Self-adaptable dicrimination for permanent fault of high-voltage electrical network
  • Self-adaptable dicrimination for permanent fault of high-voltage electrical network

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Such as figure 1 , figure 2 , As shown in Figure 3, it is assumed that the embodiment is a large unit 1 to system 2 network, and the fault point f in the area is very close to the large unit. When a fault occurs, the protection devices 3 and 4 on both sides act quickly to remove the fault. First, set the reclosing delay of the large unit 1 to be greater than the reclosing delay of the system 2, and the reclosing delay of the large unit 1 is greater than that of the system 2. The delay is at least 30 milliseconds, such as setting system 2 reclosing delay Tzh2, setting large unit 1 reclosing delay Tzh1, and setting Tzh1=Tzh2+Δt, Δt≥30 milliseconds. When the system 2 closes after the reclosing delay Tzh2, the large unit 1 has not yet reached the reclosing delay time, because the system 2 recloses in a permanent fault, the prote...

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Abstract

An adaptive method for judging permanent fault of high voltage electric network includes carrying out steps as the follows if system is closed on permanent fault, speeding up action of protective device at that place and transmitting action signal and analog quantity to equipment side through delay, acting differential criterion and quickly outputting after offside tripping signal is received by protective device at equipment side, and driving permanent jump relay to lock step of local side re-closed .

Description

technical field [0001] The invention relates to a self-adaptive discrimination method for a permanent fault of a high-voltage power grid, which belongs to the technical field of electricity. Background technique [0002] At present, the high-voltage and ultra-high-voltage transmission lines at home and abroad adopt the three-phase star connection method to output AN, BN, and CN three-phase power supplies. Most of the neutral points are overhead ground wires, but the neutral points at both ends of the line are grounded separately. The method of directly grounding the neutral point can effectively reduce the voltage to the ground of the equipment to a limited level, and the maximum does not exceed Un. If the neutral point is not grounded, the maximum voltage to the ground may reach Reducing the withstand voltage level of the equipment to the ground is conducive to greatly reducing the production and on-site maintenance of the equipment. However, in the neutral point directly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 王强李瑞生王尔寒胡叶宾路光辉桑中庆雷振峰
Owner XJ ELECTRIC
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