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How to solve the problem that SF6 gas in SF6 electrical equipment is not easy to liquefy?
发布时间：2018-11-21
来源：ydlcb 浏览次数：46次
When working in the same SF6 circuit breaker selection in high-cold areas, the local ambient temperature should be fully considered to ensure that the selected SF6 circuit breaker conditions can meet the local ambient temperature. The following measures can be taken:
1. Heat the SF6 gas in the space between the bottom of the circuit breaker and the base strut.
2. Replace the ordinary pressure gauge with a density relay because the SF6 gas pressure changes with the change of temperature, using the ordinary pressure gauge to monitor the SF6 gas pressure leakage, it is not clear whether it is due to the real gas leakage or the change in the SF6 gas pressure due to the ambient temperature. The density relay only reflects the change of SF6 gas density, and it can automatically correct the influence of temperature on pressure changes.
A heating device is installed on the outside of the breaker SF6 gas storage tank, which is composed of temperature controller, AC contactor and electric heater, and is comprehensively monitored by the anti-SF6 liquefaction management system. Use 220V AC power supply, each phase heating power is 200W, when the heating device internal temperature is lower than -10℃, the device automatically input, start heating, heat through the insulated electric heating belt, in the form of insulation heat conduction to SF6 gas storage tank metal shell, and then transferred to the circuit breaker inside the SF6 gas, the heating device is sealed with rubber and plastic insulation material. Can prevent heat loss, when the internal temperature of the heating device reaches 50 ° C, the temperature control device automatically stops and starts thermal insulation.
The anti-SF6 liquefaction management system sets the same code as the equipment number for each hot spot to monitor the operation of each hot spot in time. The transmission of normal working signal is provided by the temperature controller working signal contact to the background machine anti-SF6 liquefaction management system, and the system interfaces with the existing production management system, so as to achieve remote monitoring. Because the thermal conductivity (thermal conductivity) of SF6 gas is 30% lower than that of air at room temperature, but because the SF6 gas has a large molecular weight (146.05) and a large heat capacity, if the gas convection effect is included, the total heat conductivity is far better than that of air. The chemical properties of SF6 gas are very stable, and it is one of the more stable substances in the known gaseous substances, and its inertia is similar to nitrogen. In the pure state, it does not decompose even at the glass melting temperature of 500-600 ° C. Generally below 150 ° C, the chemical properties are stable.
After the implementation of the above measures, the phenomenon of closed control loop and liquefaction of SF6 gas pressure due to the decrease of ambient temperature has been effectively controlled. The practice shows that these new measures can be further popularized and applied in practical work.