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I. CLAIMS A sealing structure for lead wires of contacts in an oil-filled SF6 gas density relay, characterized by comprising a relay housing (1) and a terminal base (2); the terminal base (2) comprising a terminal base housing (3), a terminal base seat (4), and conductive pins (5); the terminal base seat (4) being disposed inside the terminal base housing (3), the terminal base housing (3) being welded onto the surface of the relay housing (1); a central through-hole (6) being provided at the ce

1. Introduction SF6 electrical equipment, renowned for its excellent arc-quenching and insulating properties, has been widely applied in power systems. To ensure safe operation, real-time monitoring of SF6 gas density is essential. Currently, mechanical pointer-type density relays are commonly used, providing functions such as alarm, lockout, and on-site display. To enhance vibration resistance, most of these relays are filled internally with silicone oil.However, oil leakage from density relays

IntroductionSF6 gas is widely used as an insulating and arc-quenching medium in high-voltage and extra-high-voltage electrical equipment due to its excellent insulation, arc-extinguishing properties, and chemical stability. The insulation strength and arc-quenching capability of electrical equipment depend on the density of SF6 gas. A decrease in SF6 gas density can lead to two main hazards: Reduced dielectric strength of the equipment; Decreased interrupting capacity of circuit breakers.Additio