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
CN100409018CInactive Publication Date: 2008-08-06XJ ELECTRIC +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XJ ELECTRIC
Publication Date
2008-08-06
Estimated Expiration
Not applicable · inactive patent

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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 .
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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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