What steps should I follow when supplementing SF6 gas with sulfur hexafluoride switchgear?- 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 steps should I follow when supplementing SF6 gas with sulfur hexafluoride switchgear?

发布时间：2017-09-09 来源：ydlcb 浏览次数：41次

Sulfur hexafluoride has good electrical insulation properties and excellent arc extinguishing properties. Its electric strength is 2.5 times that of nitrogen under the same pressure, the breakdown voltage is 2.5 times that of air, and the arc extinguishing ability is 100 times that of air, which is a new generation of ultra-high voltage insulating dielectric material superior to air and oil. Sulfur hexafluoride with its good insulation and arc extinguishing performance, such as: circuit breakers, high voltage transformers, gas closed capacitors, high voltage transmission lines, transformers and so on. Electronic grade high purity sulfur hexafluoride is an ideal electronic etching agent, which is widely used in the field of microelectronics technology.

The greenhouse effect means that gases such as carbon dioxide in the atmosphere can heat up the Earth's surface through short-wave radiation from the sun. At the same time, it blocks the Earth's surface from emitting long-wave radiation into space, thus warming the atmosphere. Because this role of carbon dioxide and other gases is similar to the role of "greenhouse", it is called "greenhouse effect", and carbon dioxide and other gases are called "greenhouse gases". It is found that there are six kinds of greenhouse gases emitted by human activities, they are carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons, sulfur hexafluoride, among which three kinds of fluoride. Among them, CO2 has a large impact on the greenhouse effect, accounting for 60%, while the impact of sulfur hexafluoride (SF6) gas only accounts for 0.1%, but sulfur hexafluoride (SF6) gas molecules have potential harm to the greenhouse effect, because the impact of sulfur hexafluoride (SF6) gas molecules on the greenhouse effect is CO2 molecules At the same time, the sulfur hexafluoride (SF6) gas emitted into the atmosphere has a long life of about 3,400 years. Today, about 21 billion tons of CO2 gas are released into the atmosphere each year, and sulfur hexafluoride (SF6) gas is equivalent to 125 million tons of CO2 gas each year.

Because of the high density of sulfur hexafluoride gas, it can asphyxiate people after leaking out to expel oxygen. Sulfur hexafluoride gas has high strength and superior insulation and arc extinguishing performance, and is a medium that must be used for the normal operation of many types of circuit breakers. Therefore, it is necessary to master the method of filling the circuit breaker with sulfur hexafluoride gas. According to experience, it should be inflated under the premise of clear weather and good ventilation, according to the following steps:

The first step is to remove the sulfur hexafluoride circuit breaker from operation and ensure safety. Place the sulfur hexafluoride gas cylinder upright, connect the oxygen pressure reducing valve, and connect the inflation tube to the pressure reducing valve. Open the valve door of the gas cylinder, and then open the pressure reducing valve, so that the low pressure side pressure is 20,000 to 40,000 pa, and then use a purple copper rod with a diameter of 8 mm to open the valve core of the inflation tube, and bleed the gas for 5 to 10 seconds to flush the pipeline.

The second step, determine the ambient temperature around the circuit breaker, according to the temperature-pressure curve provided by the manufacturer, find the rated pressure value of the circuit breaker when inflating. Screw off the plug under the C-phase transmission box of the circuit breaker, connect the gas tube, and then slowly open the pressure reducing valve to inflate the circuit breaker. When you hear an inflating sound in the connecting pipe, it proves that the pressure reducing valve is working normally. When the gas pressure in the circuit breaker is close to the rated pressure, it should be slowly inflated to avoid excessive circuit breaker pressure.

When the gas in the circuit breaker is charged to the rated pressure, close the pressure reducing valve, first remove the gas tube from the circuit breaker interface, and then screw the plug to the interface, and unscrew the connection between the connector and the gas tube. Close the cylinder valve, remove the reducing valve, and store the reducing valve and connector in a dry place for reuse.

The third step, after the circuit breaker is charged to the rated pressure, all sealing surfaces should be qualitatively detected. If the leakage point is found, contact the manufacturer. In addition, the water content of sulfur hexafluoride gas in the circuit breaker should also be checked. Moisture measurement should be done 24 hours after aeration. The gas flow is controlled by using the circuit breaker charging port and connected to the conical needle reducing valve, which is measured by the micro moisture detector. The measured data should be based on the ambient temperature and against the water content - temperature curve provided by the manufacturer, and its value should not exceed 150 microliters/liter (20 degrees Celsius) when on-site handover, and not exceed 300 microliters/liter (20 degrees Celsius) during operation.

The fourth step is to record the temperature, humidity and sulfur hexafluoride pressure value of the day, and make a mark on the sulfur hexafluoride pressure gauge indication for future observation and comparison to determine whether there is any abnormality in its operating status.