What are the SF6 gas leak detection methods?- SF6在线监测系统_SF6检漏仪_SF6传感器_SF6密度继电器

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What are the SF6 gas leak detection methods?

发布时间：2019-02-24 来源：ydlcb 浏览次数：30次

SF6 Gas leak detection method

SF6 gas is an insulating gas commonly used in high voltage switches. However, sf6 gas is a kind of gas prohibited by the Kyoto Agreement, which seriously damages the atmosphere. Of course, if there is leakage in the high voltage switch, it will reduce its insulation capacity. Therefore, the leakage detection of sf6 gas is particularly important. At present, there are many common SF6 gas leak detection methods, and each method has its advantages and disadvantages, which we will discuss one by one as follows.

GIS equipment adopts density relay to monitor the leakage of SF6 gas in real time. Once the pressure value drops rapidly or there is an alarm signal, further qualitative detection means are needed to find the leak site in order to determine the leak site in the shortest time and gain time for dealing with defects. Compared with SF6 inflatable equipment such as high-voltage circuit breakers and current transformers, GIS equipment has a complex process, a large number of sealing surfaces and interfaces, and a variety of reasons for air leakage, making it more difficult to determine. At present, conventional leak detection methods include soapy water leak test, local dressing method, leak detector and infrared imaging method.

First, foam leak detection method: The use of soapy water in the leak detection part to see if there is no bubble. Leakage detection and confirmation can only be carried out after the leakage location is basically known. Meanwhile, live parts that do not meet the safety distance requirements cannot be detected, and the workload is large and the applicability is poor.

Second, qualitative leak detection method: the leak detector probe along the circuit breaker connected interface surface and aluminum casting surface, according to the leak detector reading to judge the leakage of gas. This method has a large workload and no purpose. If the probe moves too fast, it is easy to miss the leak point. The leak detection is affected by the wind speed, and the leaking gas is easily blown away by the wind, which affects the leak detection, and the live equipment that does not meet the safety distance requirements cannot be detected.

Third, bandage leak detection method: the inflation equipment is wrapped up, and after a period of time, the leak detector is used to detect leaks inside the bandage body, and the leakage situation of the bandage part is checked. The workload is large, some parts are difficult or cannot be bandaged, and the live parts that do not meet the safety distance requirements cannot be detected. At the same time, the method belongs to local detection, and it is not easy to quickly find the leak point.

Infrared imaging method: it is a leak detection method of a new technology that has emerged in recent years, but it will also have certain limitations in actual use. Because the detection accuracy of infrared imaging is not high, the trace leakage can not be detected at all, and the focal length of the part with a large amount of leakage needs to be adjusted several times to find the leak point. In addition, the installation of indoor GIS equipment is more compact, and it is more difficult to detect internal leaks. For outdoor HGIS equipment, due to the high installation height, it is difficult to detect leakage on the top, edge or hidden place of the equipment. Coupled with the influence of outdoor wind speed, temperature and humidity and other environmental factors, some HGIS equipment with slight leakage is more difficult to detect by optical imaging method.

To sum up, each method has certain defects. After years of experience, the author also concluded that if the SF6 gas density relay in the high voltage switch alarms, the WINFOSS-C1 SF6 quantitative detector produced by Wefus Company is directly used to locate and quantify the parts of the sealing surface and interface flange that are easy to leak. WINFOSS-C1 is an ultra-high precision and sensitivity SF6 gas leakage quantitative detector, using the electron capture ECD principle, the highest accuracy of 0.01ppm, fast response, high precision and sensitivity, is a very stable quantitative detector, worthy of recommendation.