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Novel interphase distance III segment protecting method in consideration of influence of geomagnetically induced current

A technology of geomagnetic induction current and phase distance, which is applied in the direction of emergency protection circuit devices, electrical components, etc., to achieve the effect of strong applicability

Inactive Publication Date: 2015-08-05
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In view of this, the purpose of the present invention is to overcome the deficiencies in the prior art, to propose reasonable solutions to the misoperation caused by the phase-to-phase distance III section protection which is easily affected by the influence of geomagnetic induction current, and to ensure the safety of EHV / UHV transmission lines. safe and stable operation

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  • Novel interphase distance III segment protecting method in consideration of influence of geomagnetically induced current
  • Novel interphase distance III segment protecting method in consideration of influence of geomagnetically induced current
  • Novel interphase distance III segment protecting method in consideration of influence of geomagnetically induced current

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] Detailed exemplary embodiments are disclosed below. However, specific structural and functional details disclosed herein are merely for purposes of describing example embodiments.

[0031] It should be understood, however, that the invention is not limited to the particular exemplary embodiments disclosed, but covers all modifications, equivalents, and alternatives falling within the scope of the disclosure. Throughout the description of the figures, the same reference numerals denote the same elements.

[0032] Also, it should be understood that as used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Also it will be understood that when a component or unit is referred to as being “connected” or “coupled” to another component or unit, it can be directly connected or coupled to the other component or ...

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Abstract

A novel interphase distance III segment protecting method in consideration of influence of geomagnetically induced current comprises the steps of step A. detecting Ucos[phi], wherein U represents a marked value of an interphase measured voltage at a distance protecting mounting position, [phi]u / i represents a phase angle of an interphase voltage in front of an interphase current, [phi]=[phi]u / i + (90-[phi]L), wherein [phi]L represents the positive sequence impedance angle of a protected line, if the absolute value of Ucos[phi] is larger than a first preset threshold, switching on an interphase distance III segment protecting impedance component, and otherwise entering a step B; step B, detecting whether the content of secondary harmonic of the line current is larger than a second preset threshold, if yes, switching on the interphase distance III segment protecting impedance component, and otherwise entering a step C; and a step C, in a preset delayed time, determining whether the absolute value of Ucos[phi] is smaller than or equal with the first preset threshold, if yes, interphase shortcircuit is determined, and the interphase distance III segment functions. By means of the novel interphase distance III segment protecting method in consideration of influence of geomagnetically induced current, the interphase distance cannot be affected by the geomagnetic induced current, thereby improving system stability.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to the protection technology of stage III phase distance in the electric power system. Background technique [0002] Geomagnetic Induced Currents (GIC) caused by magnetic storms pose a potential threat to the safe and stable operation of the power grid. focus on. In areas with higher latitudes (such as North America, Northern Europe, etc.), the geomagnetic field changes drastically, and the power grid has repeatedly tripped due to geomagnetic induction currents, and even led to large-scale power outages. With the continuous expansion of the scale of the power grid, incidents of geomagnetic induction currents endangering the power grid have also occurred many times in some low- and middle-latitude regions. It is reported that 15 transformers in South Africa were permanently damaged by the influence of geomagnetic induction currents. Larger magnitude g...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 郑涛卢婷陆格野杨国生
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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