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Device and method for monitoring discharge current of parallel lightning arrester of high-voltage DC circuit breaker

A high-voltage direct current and discharge current technology, which is applied in the direction of measuring devices, current only, and current/voltage measurement, can solve problems such as the failure of the earth/metal loop conversion and the influence of the stable operation of the DC system.

Active Publication Date: 2018-11-30
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the general protection configuration logic of the DC system, if the parallel lightning arrester breakdown occurs, the control system will automatically reclose the corresponding DC circuit breaker (MRTB / ERTB), resulting in the failure of the earth / metal loop conversion accident, and the DC system The stable operation of the

Method used

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  • Device and method for monitoring discharge current of parallel lightning arrester of high-voltage DC circuit breaker

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Effect test

Embodiment 1

[0030] as attached figure 1 As shown, the present invention includes three parts: a wireless sensing wave recording device (wireless current sensing wave recording device), which is installed at the lead wires of each branch arrester of the DC circuit breaker parallel arrester, and the monitoring of the equipment area where the DC circuit breaker parallel arrester is located. The base station conducts wireless communication; the base station and the measurement and control device of the DC control system are connected by optical fiber, responsible for the transfer and transmission of data and instructions; the background software of the measurement device can compare the discharge current value flowing through each arrester horizontally, and judge the measured current value Whether it deviates from the requirements of the safety threshold range, so as to quickly and accurately diagnose the arrester that is working abnormally.

[0031] The parallel lightning arrester of the pas...

Embodiment 2

[0051] For example, in Ningxia Yinchuan East Converter Station, the bipolar DC system is equipped with a total of 5 DC circuit breakers, including 2 neutral bus circuit breakers, 2 earth / metal return line conversion circuit breakers, and 1 station ground pole circuit breaker. Due to the routine maintenance of the DC system and protection actions, the above-mentioned circuit breakers will all perform opening and closing operations. If any one of the two neutral bus circuit breakers fails during operation, the DC transmission power will be reduced by 2000MW; if any one of the two earth / metal return transfer circuit breakers fails, the bipolar DC system will fail use, reduce transmission power by 4000MW. In September 2014, in Yinchuan East Converter Station, due to the breakdown of the shunt surge arrester of the metal circuit breaker in the station, the single-pole locking accident of pole II was caused.

[0052] Therefore, Yinchuan East Converter Station adopts the lightning a...

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Abstract

The invention relates to a high voltage direct current circuit breaker parallel connection lightening arrester bleeder current monitoring device and a high voltage direct current circuit breaker parallel connection lightening arrester bleeder current monitoring method. The high voltage direct current circuit breaker parallel connection lightening arrester bleeder current monitoring device is characterized in that at least a wireless current sensing oscillograph is provided, and is wirelessly connected with a data acquisition unit, and therefore acquired instantaneous current data waveforms of measuring points are wirelessly transmitted to the data acquisition unit, which is connected with a calculation analysis platform in a wireless or wired way, and therefore the calculation analysis platform is used for the analysis and the processing of the above mentioned instantaneous current data waveforms, and is used to give hints, when abnormities are discovered. The passive type high voltage direct current circuit breaker parallel connection lightning arrester bleeder current monitoring device and the passive type high voltage direct current circuit breaker parallel connection lightning arrester bleeder current monitoring method are advantageous in that transient current waveform data flowing across an electric device at a specific moment is recorded accurately, and the data is analyzed and processed, and then maintenance staff can be aware of the operation state of the device accurately, and find out the abnormities of the electric device in advance, and therefore necessary measures are taken to prevent occurrence of accidents.

Description

technical field [0001] The invention relates to a device and method for monitoring the discharge current of a parallel lightning arrester of a high-voltage direct current circuit breaker. Background technique [0002] High voltage DC power transmission is becoming increasingly important due to the rising demand for high power delivery and interconnected power transmission and distribution systems. HVDC systems usually adopt a dual-pole ground loop operation mode. When the single pole is out of service, the other operating pole becomes the single pole ground return line operation mode, and the two stations form a loop through the ground pole. Since the single pole operation will cause the transformer near the ground pole to generate a large DC bias, At the same time, the life of the grounding electrode is also directly related to the current size and running time. Therefore, under normal circumstances, the single-pole ground return line should not be operated for a long time...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R31/02G01R19/00
CPCG01R19/0092G01R31/00G01R31/50
Inventor 邹洪森秦有苏张斌黎炜于晓军尹磊宋永强杜志强徐辉赵欣洋刘志远王宏丽潘亮亮安燕杰唐鑫侯亮李敏陈洋陈瑞林恒
Owner STATE GRID CORP OF CHINA
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