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A Solution to Grounding Distance Protection Adapting to Overload State

A technology of distance protection and solution, which is applied in the direction of emergency protection circuit devices, electrical components, etc., to achieve the effect of improving the action performance

Active Publication Date: 2017-04-12
NR ELECTRIC CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the influence of the overload problem on the distance protection, the present invention proposes a solution to the grounding distance protection adapted to the overload state, and the load limit relay is added to the grounding distance relay

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  • A Solution to Grounding Distance Protection Adapting to Overload State
  • A Solution to Grounding Distance Protection Adapting to Overload State
  • A Solution to Grounding Distance Protection Adapting to Overload State

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Embodiment Construction

[0033] The technical solution of the present invention will be described in further detail below according to the accompanying drawings.

[0034] The collected three-phase voltage and three-phase current at the protection installation are processed through filtering, Fourier transform and other measures to form the phase voltage, phase current vector, zero-sequence current vector and positive-sequence, zero-sequence RMS sequence current.

[0035] The load limiting relay is formed as follows.

[0036] Among them, the action criterion 1 is as follows:

[0037] Formula (4)

[0038] In the formula:

[0039] Phase voltage vector for protection installation;

[0040] Phase current vector for protection installation;

[0041] To protect the zero-sequence current vector at the installation;

[0042] k is the fixed value of zero sequence compensation coefficient of distance protection;

[0043] Corresponding to the three phases of A, B, and C.

[0044] Among them, R ...

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Abstract

The invention discloses a grounding distance protection solution method adaptive to an overload state. The solution method includes: according to impedance measurement ranges of distance relays under an overload condition, constructing load restriction relays which do not act under an overload condition and satisfy an action condition under a grounding fault condition; through a ratio relation of a zero-sequence current and a positive-sequence current, adjusting the action ranges of the load restriction relays so as to realize characteristic dynamic adjustment in different overload degrees; and allowing grounding distance relays of corresponding phases to be used only when the load restriction relays act so as to prevent incorrect actions of the grounding distance relays under an overload condition.

Description

technical field [0001] The invention relates to a relay protection technology in the field of electric power system, in particular to a solution for grounding distance protection adapted to overload state. Background technique [0002] Due to the AC interconnection of the large power grid and the improvement of the transmission capacity of the ultra-high voltage line, on the section of the grid interconnection, the transmission power of the tie line is already very high during normal operation, even at full load. If a fault occurs on the line at this time , The correct action of the protection jumps off the faulty line, which will cause the redistribution of power on the line, which will further increase the power transmission on other lines, and accidental overload will appear on these lines. Overload puts forward very high requirements on the backup distance. If the relay protection does not operate correctly during overload, it will cause a chain reaction such as a large ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 刘革明赵青春朱晓彤李园园沈军谢华刘东超
Owner NR ELECTRIC CO LTD
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