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State Grid company Suzhou Jianglou 110kV SF6 onlin

State Grid Company Anhui Electric Power Company Jianglou change 110kV change SF6 gas online monitoring alarm system installation overview

In accordance with the requirements of Chapter 8 of the "DL408-1991 Electrical Safety Working Regulations (Electrical Parts of Power Plants and substations)", Chapter 4 of the "DLT 639-1997 sulfur hexafluoride Electrical Equipment Operation, testing and maintenance personnel Safety protection Rules" and "JBT 10893-2008 Requirements of sulfur hexafluoride environmental monitoring system for high voltage combined electrical distribution room.


Jianglou 110kV Substation is located at the southwest corner of the intersection of Longhai Road and Lihua Road in Dangshan Economic Development Zone of Dangshan Community, Dangshan County, Suzhou City. The station is a newly built project station, and the backup automation system is installed by Henan Xuji. Wevers SF6 gas online monitoring and alarm system (WINFOSS-S1P) is used with Xu Ji intelligent monitoring. The station is equipped with 3 50MVA transformers and 2 110KV outgoing lines. The circuit breaker of the 110KV high-voltage switch room adopts GIS architecture, including 7 intervals such as 2 circuit breaker intervals and 1 current transformer.


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The SF6 gas online monitoring and alarm system of the station is configured as 1+14+1, which consists of 1 SF6 gas online monitoring and alarm monitoring host, 14 SF6 and oxygen monitoring units, 1 temperature and humidity monitoring unit, and 1 fan controller. The SF6 gas online monitoring host is installed in the outdoor GIS switch room and inspection personnel often enter and exit the door. In addition to the monitoring host stainless steel protection box, to prevent external rain and sun exposure, in order to extend the life of the whole machine, the protection box bottom plate is about 1.4 meters from the ground, the protection box door cover is set with high-definition transparent acrylic to make a visual window, in the case of not opening the door cover, you can clearly and easily see the SF6 leakage monitoring host interface installed inside the box. Fourteen sulfur hexafluoride and oxygen in-one monitoring units are installed on the GIS base support, about 10 cm above the floor, and one temperature and humidity monitoring unit is installed on the GIS base support in the middle of the switch room. The sound and light alarm device and the human body infrared detection voice device are arranged on the monitoring host protection box, and the fan controller device is controlled through the linkage between the system host and the fan control box. When the system host starts manually or the sulfur hexafluoride gas and concentration exceed the set parameter range, the fan is immediately started for ventilation. To ensure that the whole switch room ventilation is good to ensure the personal safety of inspection personnel.


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SF6 gas online monitoring alarm system SF6 monitoring adopts intelligent infrared spectral sensor imported from Switzerland to quantitatively detect SF6 gas in the regional air (the use of open optical path highly sensitive mid-infrared laser absorption spectroscopy technology to eliminate the laser's own intensity fluctuations and the influence of the external environment). Real-time display of SF6 gas concentration value in the regional air, arbitrary setting of alarm concentration, when the environment SF6 gas concentration exceeds the set alarm value issued alarm function. Each SF6 gas laser detector can monitor the SF6 concentration change in the range of 0.1 ~ 200m, without any sampling device, only a reflector is needed, the laser is reflected back by the reflector to reach the detector after the area to be monitored, and the SF6 concentration in the entire optical path is measured. The oxygen concentration monitoring unit adopts the original oxygen sensor imported from Japan to monitor the oxygen concentration in the environment online and in real time.


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3. Technical parameters

SF6 gas detection sensitivity: ± 1ppm

SF6 gas concentration alarm threshold: 100-1500ppm (adjustable)

Oxygen detection concentration: 1 ~ 25U%

Oxygen concentration alarm threshold: adjustable

Oxygen measurement accuracy:<0.5% (0.4%,O2 at 21%)

Temperature display range: -25 ~ 99℃

Temperature measurement accuracy:<0.5%

Temperature alarm threshold: adjustable

Humidity range: 0 to 99%RH

Humidity measurement accuracy:<3%

Input voltage: 176 ~ 265VAC

Alarm output point: 2A

Fan output contact power supply: 380VAC 40A

Fan ventilation time setting: 15MIN/ time (adjustable)

Data recording time: 5 years, host computer mass storage

Communication: RS-485 standard protocol


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The system can not only monitor on the spot, but also synchronize dynamic monitoring on the computer in the main control room. It also supports the remote alarm of the dispatch center in the form of hard contact with the field remote device. It is also designed for SF6 switch station and compatible with SF6 gas density online monitoring and SF6 gas micro-water online monitoring.


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