Solid insulated ring main unit accessories isolation switch core PT (without SF6 gas)

3-position disconnector core specially designed for solid insulated ring main units (RMU), mainly matching PT (potential transformer) circuits. Its core functions are: ① Realize three-position switching (closing, isolation, grounding) to ensure safe power supply and maintenance; ② Provide a visible isolation gap to isolate the power source and PT circuit, avoiding electric shock hazards during maintenance; ③ Bear normal working current and short-circuit current, ensuring stable operation of the power distribution system. Working principle: Driven by manual or electric operating mechanism, the moving contact is driven by the transmission structure to switch between three positions: In the closing position, the moving contact and static contact are closely connected to conduct current; in the isolation position, the contacts are completely separated to form a standard insulation distance; in the grounding position, the moving contact is connected to the grounding contact to ground the PT circuit, which is in line with the safety operation specifications of power systems.

Key advantages: ① High conductivity: Low resistance reduces power loss and avoids overheating; ② Solid insulation protection: Moisture-proof, dust-proof and corrosion-resistant, suitable for harsh indoor environments; ③ Compact structure: Fits the miniaturized design of solid insulated RMUs, saving installation space; ④ SF6-free environmental protection: Consistent with the green operation concept of solid insulated RMUs, no greenhouse gas emissions. Material selection: ① Copper: Higher conductivity (lower resistivity ~0.017Ω・mm²/m), better mechanical strength and corrosion resistance, suitable for high-load, long-term stable operation scenarios (e.g., industrial substations); ② Aluminum: Lighter weight (1/3 of copper density), lower cost, suitable for cost-sensitive, low-to-medium load scenarios (e.g., urban residential distribution networks) .