SF6 gas-insulated switchgear ZF27-550

high-voltagefor electrical networks

ZF27-550 , developed independently by Pinggao, is the GIS with the 550KV level, its technical parameters has been reached the international leading level. Used in the power system of 550KV, can be realized the controlling, measurement and protection. The main components include circuit breakers, disconnectors, earthing switches, quick earthing switches, current transformers, busbars and bushings for the wire’s incoming and outgoing. The external insulation of the bushing is air insulation, the rest of components are closed in the eath’s crust which use SF6 gas as arc extinguishing and insulating medium. Can be combined into different connection mode according to user’s requirements. Main Features 1.Circuit breaker arcing chamber is a single fracture design, simple and reasonable structure, high technical content 2. Strong breaking capacity, long contact electrical life, long service period 3. Circuit breaker unit is installed on site without opening the chamber, which can be filled the SF6 gas directly, to avoid the intrusion of dust and foreign bodies 4. There are almost no external pipe for this new type of hydraulic operating mechanism, the possibility of oil leakage is reduced. 5. When operating the oil pressure, hydraulic operating mechanism is controlled by the pressure switch automatically, can be maintained constantly the rated oil pressure without being affected by ambient temperature, at the same time, the relief valve in the mechanism can be exempted from the risk of overpressure. 6. After the loss of pressure, hydraulic operating mechanism has the function of not slowing points when the pressure is reconstructed