Electric transmission line one-phase grounding fault full-component voltage protection method
A single-phase ground fault, transmission line technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of low protection reliability, impact, and inability to apply line protection
Active Publication Date: 2013-06-12
STATE GRID FUJIAN ELECTRIC POWER CO LTD +3
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Problems solved by technology
The line distance protection based on the sudden change is less affected by the system operation mode and has strong anti-transition resistance capability. It cannot play the role of relay protection for the line fault after two weeks of waves, and cannot be applied to the protection of the entire fault process of the line.
Although the line distance protection based on full components can be applied to the protection of the entire fault process of the line, because the self-protection algorithm is seriously affected by the transition resistance, it is easy to cause the protection to refuse to operate or malfunction in the event of a high-impedance ground fault, and the protection reliability is not high.
Method used
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Embodiment Construction
[0014] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0015] The protection device measures the fault phase voltage at the transmission line protection installation , fault phase current , fault phase negative sequence current and zero sequence current ; Among them, φ=A, B, C phase.
[0016] Calculation of voltage drop from a transmission line protection installation to a single-phase-to-earth fault point real part of :
[0017]
[0018] Calculation of voltage drop from a transmission line protection installation to a single-phase-to-earth fault point the imaginary part of :
[0019]
[0020] Among them, β is the fault phase negative sequence current the phase angle; is the fault phase voltage the real part of is the fault phase voltage the imaginary part of for the imaginary part of for the real part of .
[0021] Distribution characteristics of...
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The invention discloses an electric transmission line one-phase grounding fault full-component voltage protection method. Voltage drop distribution characters along a line are utilized to achieve electric transmission line one-phase grounding fault full-component voltage protection, wherein the voltage drop distribution characters include namely that in the process of failing of a protection region, voltage drop amplitude along the line between the electric transmission line protection installation place and a one-phase grounding failure point is smaller than voltage drop amplitude between the protection installation place and a protection setting range, and in the process of failing outside the protection region, voltage drop amplitude along the line between the electric transmission line protection installation place and the one-phase grounding failure point is larger than voltage drop amplitude between the protection installation place and the protection setting range, motion performance not only is affected by systematic operation mode and load current, but also removes effect of the transition resistance on protective motion performance, and the electric transmission line one-phase grounding fault full-component voltage protection method is suitable for protection of the process of whole failure of the electric transmission line one-phase grounding fault.
Description
technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a full-component voltage protection method for a single-phase ground fault of a transmission line. Background technique [0002] Transmission line distance protection can be divided into two types: line distance protection based on sudden change and line distance protection based on full component according to the different electrical quantities used. The line distance protection based on the sudden change is less affected by the system operation mode and has strong anti-transition resistance capability. It cannot play the role of relay protection for the line fault after two weeks of waves, and cannot be applied to the protection of the entire fault process of the line. Although the line distance protection based on full components can be applied to the protection of the entire fault process of the line, because the self-protection algorithm is se...
Claims
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IPC IPC(8): H02H7/26
CPCH02H7/226
Inventor 林富洪曾惠敏
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD