UHV DC system ground electrode line protection method and device

A UHV DC and line protection technology, applied to emergency protection circuit devices, electrical components, etc., can solve the problem that the performance of the ground electrode line protection method cannot fully meet the requirements

Active Publication Date: 2019-12-31
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +2
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Problems solved by technology

[0008] Aiming at the defects of the existing grounding electrode line protection scheme, the present invention proposes a grounding electrode line protection method including main protection and backup protection by using the measured impedance transverse difference on the basis of the traditional grounding electrode line protection based on the injection method, aiming to solve the problem of The technical problem that the performance of the existing grounding electrode line protection method cannot fully meet the requirements

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  • UHV DC system ground electrode line protection method and device
  • UHV DC system ground electrode line protection method and device
  • UHV DC system ground electrode line protection method and device

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Embodiment Construction

[0073] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, under the condition of not conflicting with each other, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0074] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from the scope of this description. Therefore, the protection scope of the present invention is not limited by the following disclosure. limitations of specific examples.

[0075] Earth electrode line protection based on high frequency current injection such as figure 1 As shown, the UHV DC system is erected in the way of double ci...

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Abstract

A method for protect grounding electrode line of UHVDC system include injecting high-frequency current signal at head end of grounding electrode line, injecting high-frequency current signal at head end of grounding electrode line, inject high-frequency current signal at head end of grounding electrode line, injecting high-frequency current signal at head end of grounding electrode line. 2, collecting electric quantity data required by fault criterion of grounding electrode line based on injected high-frequency current signal; 3, jud that symmetry of the ground pole circuit structure based onthe data collect in the step 2; 4, based on the symmetry judging result of the step 3, judging the fault of the earth pole line; 5, aft that grounding electrode line fail, the relay protection devicesends out a fault alarm signal to the monitoring device; The reliability of grounding line protection method is improved.

Description

technical field [0001] The invention belongs to the field of electric power system and automation thereof, and in particular relates to a criterion structure of a ground electrode line protection method in an extra-high voltage direct current transmission system. Background technique [0002] The grounding electrode is an important part of the UHVDC transmission system, and it mainly plays the role of clamping the neutral point voltage and providing a path for the unbalanced current. However, with the rapid development of UHV DC projects, the site selection of grounding electrodes is becoming more and more difficult. In order to avoid the impact of DC bias on the converter station equipment, the distance between the grounding pole and the converter station of some DC projects that have been put into operation has exceeded 100km. For some UHV DC projects in design, the grounding pole is even close to 200km away from the converter station. Therefore, ground electrode line pr...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 李世龙滕予非李小鹏刘明忠吴杰冯世林罗荣森孙永超段翔兮
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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