SF6 gas density relay on-site inspection of the relevant issues

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 density monitor, is installed in the SF6 electrical equipment used to reflect the equipment within the gas density changes in the device (also known as density monitors, density controller, density table, etc.). The density relay is essentially a meter that shows changes in the density of the gas in the device under test. SF6 gas density relay can be in the equipment when the gas density down to the specified alarm value, the alarm signal, when the gas leakage due to equipment failure, so that SF6 gas density continues to decline, to reach the specified blocking pressure (general density relay lock pressure Value is lower than the alarm pressure of about 0.02 ~ 0.05 M Pa), the density relay can block the circuit breaker of the sub-closing operation. SF6 gas density relay performance is good or bad, a direct impact on the safety of electrical equipment.