110kv Xiergou substation SF6 concentration leakage monitoring and alarm system transformation case

韦弗斯解决方案

应用案例

SF6安全保障专家

专注于SF6气体检测的专业化

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110kv Xiergou substation SF6 concentration leakage

The 110KV Xiergou substation of Gansu Electric Power Company is located in Xiergou Township, Zhouqu County, Gannan Tibetan Autonomous Prefecture, and the four substations from 110KV Axa Substation, Lijie Substation and Zhouqu County Substation to 330KV Luoda Substation.

The original SF6 concentration leakage monitoring and alarm system used in the substation frequently had problems, such as black screen of death, false alarm and other problems, and the power station reported to the power company for replacement. Gansu Electric Power Company adopted the Weifers SF6 concentration leakage monitoring and alarm system (winfoss-si), which was linked with the upper and lower fans in the switch (GIS) room for control. When leakage occurs or the oxygen content is too low, the fan is automatically controlled to run, and the fan is automatically controlled to stop discharging air until the ambient concentration returns to normal.

With flexible composition and unified interface standard, the system can not only meet the current monitoring requirements of the power station, but also facilitate the future expansion compatibility requirements even if the number of SF6 units increases or decreases and other SF6 switch monitoring systems are introduced. The system can be connected with a remote device to realize remote remote alarm. After selecting the configuration of monitoring software or network application software, device drivers can be installed on the monitoring center platform and corresponding communication ports can be configured to realize the monitoring and control of field data on the monitoring center operation platform, which can further improve the efficiency and management level of maintenance work, and provide support for the realization of paperless office and unmanned on-duty of power station maintenance.

Technological advantage

Multi-master mode work, without the need for the distributor in the traditional measurement and control network, any monitor in the system can send information to other monitors in the network independently, regardless of master and slave.

Using non-destructive bus arbitration technology, when multiple monitors send data, the monitor with a higher priority can continue to transmit data without being affected, improving the data loss and even network paralysis caused by network data conflicts.

Strict error detection and definition, any monitor in the system abnormal does not affect the work of other equipment.

The direct communication distance can reach 10km (8.2km measured), the maximum communication rate can reach 1Mb/s, and a single loop can drive 110 monitors.

l Support distributed CAN bus technology, the system has the following advantages:

① Accurate data sampling, low bit error rate;

② The system structure is clear, easy to install, can reduce the user's later maintenance costs;

③ The system capacity is large, which solves the user's worries about flexible expansion of the monitor in the later stage;

④ Strong anti-interference, improve the stability and reliability of the system.

l6) 32-bit DSP (digital Signal processing) technical features:

32-bit data parallel processing, leakage alarm response is rapid;

l Built-in multiple 16-bit resolution A/D converters improve the quantization accuracy of the sampled data;

l Built-in multiple D/A converters can easily realize the intelligent control of field equipment;

Mass storage, can store at least 15 years of historical detection data;

The 10.4-inch LCD display interface is the largest display interface currently used in the field industrial control system, and all monitoring data can be displayed on the same screen at the same time, which increases the beauty of the product and is more convenient for users to visually view the monitoring data, and the operation is simple and convenient. It overcomes the deficiency that some data in the 4-8 inch interface of the traditional industrial control system must enter the sub-interface to browse and operate.

l The system adopts a full-chip chip with a modular design of partitions to improve system integration and reliability while reducing product power consumption.

The main advantages of thermal cracking sensing detection technology are as follows:

1) The use of thermal cracking technology, which belongs to a polymer thermal cracking principle.

2) Its core component is a small gas sensor that can detect small changes in the conductivity caused by the cracking of SF6 gas after contact with polymer. When the surrounding SF6 concentration and air quality change, the conductivity of the gas sensor changes and gives a signal output.

3) Its main advantages and disadvantages are:

The leakage concentration of SF6 directly determines the resistance distribution on the sampling circuit, and the sampling current changes, and the response is rapid. It overcomes the shortcomings of low detection accuracy and slow sampling speed caused by the need to detect new substances in the early catalytic combustion technology.

l The resistance change of the detection layer determines the strength of the output current, which is easy to quantify and not susceptible to environmental temperature and humidity interference. It overcomes the influence of ambient temperature and humidity when the catalytic combustion technology must be heated to 500-600℃.

l Design multiple detection sampling loops on a single sensor, and obtain the equilibrium value of each loop at the output end, which is easy to obtain high-precision sampling results.

l Multi-loop synchronous detection, when one or more loop output exceeds the limit, it is judged to be caused by interference, easy to eliminate, and eliminate false alarm phenomenon.

l Polymer sensing layer for SF6 gas detection, not susceptible to other gases.

l Overcome the lack of long life caused by laser technology or infrared technology due to external dust degree.

Due to the high technical content of design and development, high R&D and raw material costs. In contrast, research and development design is difficult.

The dual detection function of SF6 concentration and oxygen of Weavers' transformation program can play a double safety detection advantage for any detection position, and more effectively ensure that technical personnel are protected by safety tips and personal protection in any environment.