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Transmission line grounding distance protection stage iii protection method

A transmission line and distance protection technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of refusal or malfunction of impedance distance protection, failure to be isolated from the power grid in time, and expansion of the fault range, so as to eliminate the protection action. The impact of performance, the prevention of large power flow transfer in the power grid, the effect of ensuring the correct operation of the protection

Active Publication Date: 2018-11-06
STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
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AI Technical Summary

Problems solved by technology

[0003] The additional impedance generated by the transition resistance will cause the refusal or malfunction of the impedance distance protection. The refusal of the protection will make the fault unable to be isolated from the grid in time, which is not conducive to the stable operation of the grid; Transfer, and then lead to the occurrence of large-scale power outage accidents

Method used

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  • Transmission line grounding distance protection stage iii protection method
  • Transmission line grounding distance protection stage iii protection method
  • Transmission line grounding distance protection stage iii protection method

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Embodiment Construction

[0018] The technical solution of the present invention will be further described in detail according to the accompanying drawings.

[0019] figure 1 It is a schematic diagram of the line transmission system applying the present invention. The protection device measures the ground fault phase voltage at the transmission line protection installation Earth fault phase current Earth fault phase negative sequence current and zero sequence current Among them, φ is the ground fault phase: A phase, B phase, C phase.

[0020] The protection device uses the ground fault phase negative sequence current Calculate the phase of the ground arc voltage phase

[0021] Calculation of Grounding Arc Voltage Amplitude at Grounding Fault Point of Transmission Line by Protection Device

[0022]

[0023] in, is the ground fault phase voltage; is the ground fault phase current; is the zero-sequence current; is the ground fault phase negative sequence current; z 1 is the pos...

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Abstract

The invention discloses a power transmission line grounding distance protection III segment protection method. The method is characterized in that grounding fault phase voltage, grounding fault phase current, grounding fault phase negative sequence current, and zero sequence current of a power transmission line protection installation part can be measured; a grounding arc voltage phase can be calculated by using the phase of the grounding fault phase negative sequence current, and a grounding arc voltage amplitude of a power transmission line grounding fault point can be calculated, and a voltage amplitude variable quantity corresponding to a power transmission line grounding fault front / rear grounding fault point can be calculated, and then the grounding distance protection III segment protection criterion can be formed by using the voltage amplitude variable quantity corresponding the grounding fault point and the power transmission line rated phase voltage amplitude. The power transmission line grounding distance protection III segment protection criterion can be formed by using the grounding arc voltage amplitude characteristic of the power transmission line grounding fault point, and in principle, the influence of the additional impedance caused by the transition resistance on the grounding distance protection III segment protection motion performance can be eliminated, and then the capability of tolerating the strong transition resistance and the strong load current influence can be provided, and therefore the power transmission line grounding distance protection III segment protection correct motion can be guaranteed, the power grid flow big transfer caused by the back-up distance protection motion can be effectively prevented, and the safety and stability of the operation of the power grid can be enhanced.

Description

technical field [0001] The invention relates to the technical field of impedance distance protection of electric power systems, in particular to a protection method for section III of grounding distance protection of transmission lines. Background technique [0002] Traditional earth impedance distance protection measures fault impedance z relay The calculation formula is because therefore That is, traditional grounding impedance distance protection measures fault impedance z relay The calculation result of is composed of two parts: one part is the fault impedance xz that reflects the real fault distance 1 , the other part is the additional impedance caused by the transition resistance In the above formula, is the ground fault phase voltage; is the voltage at the ground fault point; is the ground fault phase current; is the zero-sequence current; φ is the ground fault phase: A phase, B phase, C phase; z 1 is the positive sequence impedance of the transmis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/26
Inventor 姚志涵陈敏蔡方伟
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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