Method for longitudinal zero-sequence power direction protection of double circuit line on same pole

A zero-sequence power and directional protection technology, applied in the electrical field, can solve the problems of double-circuit configuration, misjudgment or refusal of zero-sequence power directional protection criterion, loss of directionality of zero-sequence power directional protection criterion, etc. The effect of improving accuracy and improving the accuracy of judgment

Inactive Publication Date: 2009-12-02
XJ ELECTRIC +1
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  • Description
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AI Technical Summary

Problems solved by technology

So far, the traditional zero-sequence power directional protection criterion for double-circuit lines paralleled on the same pole is to apply the zero-sequence power directional protection for single-circuit lines directly to double-circuit lines without using double-circuit lines as a Configured as a whole, when a f

Method used

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  • Method for longitudinal zero-sequence power direction protection of double circuit line on same pole
  • Method for longitudinal zero-sequence power direction protection of double circuit line on same pole
  • Method for longitudinal zero-sequence power direction protection of double circuit line on same pole

Examples

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Example Embodiment

[0023] figure 1 , when a single-phase grounding fault occurs in the I-circuit inside the double-circuit line paralleled on the same pole, the zero-sequence voltage of the busbar on the M side is:

[0024] U · M 0 = U · 0 + α I · 01 Z 0 - - - ( 3 )

[0025] where: is the zero-sequence voltage of the M-side busbar, is the zero-sequence current on the M side of line I, is the zero-sequence voltage at the ground point, Z 0 is the zero-sequence impedance of the line, α is the ratio of the short-circuit point distance to the length of the entire line; the zero-sequence voltage of the N-side bus is

[0026] ...

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Abstract

The invention discloses a method for longitudinal zero-sequence power direction protection of a double circuit line on a same pole, which comprises an own-side zero-sequence power direction criterion and an opposite-side zero-sequence power direction criterion, and the own-side zero-sequence power direction criterion is shown by a formula (I) while the opposite-side zero-sequence power direction criterion is shown by a formula (II), wherein 3I0M and 3I0N are zero-sequence currents of an M side and an N side of one loop, 3I0M' and 3I0N' are the zero-sequence currents of an M side and an N side of the other loop, 3UM0 and 3UN0 are bus zero-sequence voltages of an M side and an N side at a protective mounting part, Arg shows a subsequent phasor phase-taking angle, and K is a zero-sequence mutual inductance influence coefficient. By using the AND gate outputs of the two criterions, when the two formulae are satisfied at the same time, ground faults can be determined to appear in a protected area, and the criterions of the longitudinal zero-sequence power direction protection are acted.

Description

technical field [0001] The invention belongs to the field of electricity, and in particular relates to a longitudinal zero-sequence power direction protection method applicable to double-circuit lines paralleled on the same pole. Background technique [0002] Due to the advantages of narrow outlet corridor, large transmission capacity, low investment, quick effect, improved power supply reliability, and simple operation and maintenance, the double-circuit line on the same pole can be well adapted to the modern power system. It is reliable, economical, and has a large transmission capacity. and other requirements, has been widely used. There is not only electrical connection but also magnetic connection between the double circuit lines paralleled on the same pole. There is a large zero-sequence mutual inductance effect between the double circuit lines paralleled on the same pole. When one of the circuit lines fails, the other circuit line There is also a fault current flowin...

Claims

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Application Information

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IPC IPC(8): H02H3/32
Inventor 李瑞生孟远景鄢安河索南加乐樊占峰
Owner XJ ELECTRIC
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