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A method of suppressing the submerged current of super/ultra-high voltage transmission lines without transposition

A technology for transmission lines and submerged current supply, applied in the field of suppression, can solve problems such as inability to effectively suppress submerged current supply, single-phase reclosing failure, etc., and achieve the effect of simple and easy adjustment method, reduction of submerged supply current, and improvement of conditions.

Active Publication Date: 2016-09-21
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0007] The present invention provides a method for suppressing the submerged current of super / ultra-high voltage transmission lines without transposition, which solves the problem that the submerged current cannot be effectively suppressed when a symmetrical high-resistance is installed on non-transposition super / ultra-high voltage transmission lines, resulting in single The problem of phase reclosing failure, thereby improving the single-phase reclosing conditions and increasing the success rate of single-phase reclosing

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  • A method of suppressing the submerged current of super/ultra-high voltage transmission lines without transposition
  • A method of suppressing the submerged current of super/ultra-high voltage transmission lines without transposition
  • A method of suppressing the submerged current of super/ultra-high voltage transmission lines without transposition

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Embodiment Construction

[0049] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0050] The rated capacity of the split-phase adjustable high-voltage shunt reactor in the embodiment is 420MVar, and the three-phase windings have 5 gears, the first gear is 10% of the rated capacity, the second gear is 40% of the rated capacity, and the third gear is 70% of the rated capacity The rated capacity, the 4th gear is the rated capacity (100%), and the 5th gear is 130% of the rated capacity.

[0051] Figure 5-Figure 7 The wiring diagram of the split-phase adjustable high-voltage shunt reactor in the non-transposed UHV AC single-circuit transmission line is given. Among them, the small reactance of the neutral point of the split-phase adjustable high-voltage shunt reactor is 600Ω, and the line length is 100km. The erection method is as follows: Figure 8 shown. The switching strategy of the split-phase adjustable high-voltage shunt reactor when ...

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Abstract

The invention provides a method for restraining a secondary arc current of a transposition-free super-high voltage / ultra-high voltage transmission line. The method comprises the steps that a split-phase regulating type high-voltage paralleling reactor is installed on the transposition-free super-high voltage / ultra-high voltage transmission line; a complete electromagnetic transient simulation model of a power system is established; the switching strategy of the split-phase regulating type high-voltage paralleling reactor is made. By the adoption of the method for restraining the secondary arc current of the transposition-free super-high voltage / ultra-high voltage transmission line, the problem that when a symmetrical high voltage reactor is arranged on the transposition-free super-high voltage / ultra-high voltage transmission line, the secondary arc current cannot be effectively restrained, so that single-phase reclosure fails is solved, as a result, the condition of the single-phase reclosure is improved, and the success rate of the single-phase reclosure is increased.

Description

technical field [0001] The invention relates to a suppression method, in particular to a method for suppressing the submerged current of a non-transposition super / ultra-high voltage transmission line. Background technique [0002] In the power system, when a single-phase instantaneous ground fault occurs on the transmission line, the faulty phase can be isolated from the non-faulty phase by operating the circuit breakers at both ends of the faulty phase transmission line. Due to the capacitive coupling and inductive coupling between the faulty phase and the non-faulty phase, the arc at the fault may not be extinguished quickly, resulting in the failure of fast single-phase reclosing. This situation is more serious in non-transposed EHV / UHV transmission lines, because the capacitance parameters and inductance parameters of non-transposed EHV / UHV transmission lines are unbalanced, and the potential supply current is not related to the transmission line length and operating vol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/08H02J3/26
CPCY02E40/50
Inventor 马其燕郑彬班连庚项祖涛韩彬杜宁宋瑞华陈珍珍刘传文周佩朋韩亚楠杨大业
Owner STATE GRID CORP OF CHINA
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