SF6 density relay

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Working principles of SF6 gas density table

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  1. When the density meter is not installed, if the ambient temperature is 20 ℃, the pointer 2 points to 0MP, but if the ambient temperature is not 20 ℃, because the double-layer metal belt 3 is in accordance with the ambient temperature and 20 ℃ difference to compensate So that when the ambient temperature is higher than 20 ° C, the double-layer metal strip 3 is elongated and its lower end is displaced in the direction of 5, causing the gear mechanism and the pointer 2 to move in the direction in which the density or pressure indication value decreases, The reading of the pointer 2 is greater than 0MP; otherwise, when the ambient temperature is below 20 ° C, the gear mechanism and the pointer 2 will move in the direction of increasing the density or pressure indication value. 2. When the SF6 gas is charged to the circuit breaker , the end of the elastic metal pipe 1 is displaced in the direction of 4 as the gas pressure is gradually increased, and the double-layer metal strip...
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SF6 gas density relay on-site inspection of the relevant issues

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SF6 gas has been widely used in high pressure, ultrahigh voltage electrical equipment as insulation and arcogenic medium because of its excellent insulation, arc suppression characteristics and stable chemical properties. While the electrical equipment of the dielectric strength and arc suppression capacity depends on the density of SF6 gas. SF6 gas density will bring two aspects of the harm, first, resulting in lower voltage strength of electrical equipment, and second, led to the circuit breaker breaking capacity decline. In addition, the SF6 density relay reduction is usually caused by leakage, and leakage is often accompanied by the atmosphere of water into the equipment penetration, resulting in SF6 gas water content increased, resulting in electrical equipment, insulation performance further decreased.   Therefore, in order to ensure the safe and reliable operation of electrical equipment, it is necessary to monitor the density of SF6 gas.  sf6 gas dens...
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