Method for carrying out failure protection and logic optimization on UHVDC (Ultra-High Voltage Direct Current) neutral bus switch

A neutral bus, logic optimization technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as non-fault outage, transmission power interruption, failure to isolate faults, etc., to avoid bipolar outage.

Inactive Publication Date: 2011-06-08
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] After the neutral bus switch failure protection action, in order to prevent the neutral bus switch from being damaged, it is necessary to reclose the neutral bus switch. If the neutral bus switch is reassembled and locked, the fault cannot be isolated, which may

Method used

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  • Method for carrying out failure protection and logic optimization on UHVDC (Ultra-High Voltage Direct Current) neutral bus switch
  • Method for carrying out failure protection and logic optimization on UHVDC (Ultra-High Voltage Direct Current) neutral bus switch
  • Method for carrying out failure protection and logic optimization on UHVDC (Ultra-High Voltage Direct Current) neutral bus switch

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Embodiment Construction

[0024] the following figure 2 Take the fault at point K as an example. When a ground fault occurs at point K of pole one during bipolar operation, the protection of pole one takes place and the pole isolation operation is performed. During the pole isolation process, the neutral bus switch (NBS ), once the neutral bus switch fails to separate, the neutral bus switch failure protection will act, and the neutral bus switch will overlap and lock. image 3 It can be seen that pole 2, as a non-fault pole, will provide current to the fault point, and pole 2 will form a loop with the opposite station through the fault point and the grounding point of the grounding pole. Hazard, requires outage of non-faulty pole.

[0025] After the neutral bus switch failure protection action, while the pole is performing pole isolation operation, according to image 3 The operation shown closes the grounding switch (NBGS) in the station. After the grounding switch in the station is closed, pole 2...

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Abstract

The invention discloses a method for carrying out failure protection and logic optimization on a UHVDC (Ultra-High Voltage Direct Current) neutral bus switch. In the operating process of double poles, once the neutral bus switch of a failure pole fails, firstly the operation of detecting whether a basis pole isolation signal exists is carried out, the operation is completed if the basis pole isolation signal does not exist, and the following steps are carried out if the basis pole isolation signal exists: 1, sending a command to make the neutral bus switch coincided and locked; 2, switching off an instation neutral bus earthed switch; 3, separating an isolation switch near the neutral bus switch of the failure pole; and 4, after the isolation switch is separated and is in place, switching off the instation earthed switch. After the processing method is adopted, when the neutral bus switch fails, the failure pole can still be isolated, so that the operation stoppage of the double poles is effectively avoided.

Description

technical field [0001] The invention relates to an action strategy for neutral bus switch failure protection of an UHV direct current transmission system and a protection device adopting the strategy. Background technique [0002] In the UHV DC transmission system, since the DC current does not have a zero-crossing point like the AC current, the breaking capacity of the DC circuit breaker is limited and depends on its own auxiliary circuit. Configure a DC circuit breaker on the bus side for pole isolation operation, namely figure 1 In the neutral bus switch (NBS), when the neutral bus switch fails to operate, that is, when the switch fails, if the appropriate handling method is not adopted, it may cause bipolar outage. The neutral bus switch failure protection criteria are as follows: [0003] After the neutral bus switch NBS receives the trip command for a period of time, the IDNE current exceeds a certain value, and the neutral bus switch failure protection action. [00...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 卢宇赵森林
Owner NR ELECTRIC CO LTD
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