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Adaptive setting method for final circuit breaker protection based on voltage-energy characteristics

A final circuit breaker, self-adaptive technology, used in emergency protection circuit devices, adjustment of protection switch conditions, electrical components, etc., can solve problems such as false blocking of DC systems, improve reliability, improve safety and stability, extend The effect of action time

Active Publication Date: 2017-06-30
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing defect is that it cannot realize adaptive action to the severity of the fault, and there is a certain probability of blocking the DC system by mistake

Method used

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  • Adaptive setting method for final circuit breaker protection based on voltage-energy characteristics
  • Adaptive setting method for final circuit breaker protection based on voltage-energy characteristics
  • Adaptive setting method for final circuit breaker protection based on voltage-energy characteristics

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Embodiment Construction

[0025] Before starting the protection, the reference value of the final circuit breaker protection logic should be set, including the voltage operating value Uset=460kV, the current operating value Iset=20A, the threshold of arrester energy consumption Eset=3.1MJ, and the threshold value of the voltage change rate And delay Td=100ms. Among them, this protection is applied to the UHV DC transmission system. The UHV DC transmission line is connected to the AC system on the inverter side through the inverter. The AC system on the inverter side is composed of transmission lines with different parameters. Finally, the circuit breaker protection collects the AC bus incoming line voltage U of the AC system and the lightning arrester leakage current I installed on the AC bus incoming line for protection calculation, and compares them with the voltage action value Uset and the current action value Iset respectively. After the comparison, decide whether to calculate the energy consumpt...

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Abstract

The invention provides a last circuit breaker protection adaptive setting method based on voltage-energy characteristics. A reference value of last circuit breaker protection logic needs to be set before protection is started, and the following judgment process is started after a last circuit breaker is tripped, wherein the judgment process includes the steps that firstly, whether voltage or current values exceed set operating values or not is judged; if yes, the second step is executed, and if not, a direct current system is not locked; secondly, energy consumption of a lightning arrester is calculated; thirdly, whether energy consumption of the lightning arrester exceeds a set operating value or not is judged, if yes, the fourth step is executed, and if not, the direct current system is not locked; fourthly, whether the over-voltage change rate exceeds a set operating value or not is judged, if yes, the direct current system is immediately locked, and if not, the direct current system is delayed for Td and then locked. According to the method, last circuit breaker protection can correctly and quickly make a response to a fault, and the safety and the stability of the extra-high-voltage direct current transmission system are improved.

Description

technical field [0001] The invention relates to the final circuit breaker protection setting technology of the high-voltage direct current system, especially how to automatically adjust the action time according to the seriousness of the fault. Background technique [0002] In the high-voltage DC system, when the inverter side loses the AC power supply, since a large number of reactive power compensation devices connected to the commutation bus cannot be cut off quickly, if the DC system fails to be blocked in time, the DC system will continue to charge it, thus Serious temporary overvoltage will affect the safety of valves, lightning arresters and commutation busbars. Therefore, in order to prevent this from happening, the final circuit breaker protection is usually installed in the inverter station to ensure that when the above situation occurs Quickly lock the valve to ensure the safety of the DC system. [0003] The final circuit breaker protection of the UHV DC system ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H71/74
CPCH02H7/22
Inventor 李明黎小林李岩黄莹刘涛田凌寻斌斌李婧靓
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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