High -voltage circuit breakers (or high -voltage switches) can not only cut off or close the air load current and load current in the high -voltage circuit, but also cut off the load current and short circuit current when the system fails to protect the device when the system fails.The perfect arc extinguishing structure and sufficient flow ability can be divided into: oil circuit breakers (multi -oil circuit breakers, less oil circuit breakers), hexal fluoride sulfur circuit breaker (SF6 circuit breaker), vacuum circuit breaker, compressed air broken road broken roadObjects and other.
Selection of high -voltage circuit breakers
In order to ensure the safety of high -voltage electrical appliances under normal operation, maintenance, short circuit, and overvoltage, high -voltage appliances should be selected according to the following conditions: ① Selection of voltage, current, frequency, mechanical load, etc.The selection of tolerance current, peak tolerance current, control and opening of the disrupting current; ③ According to environmental conditions including temperature, humidity, altitude, earthquake, etc.Different characteristics of high -voltage appliances include the operation performance of the switch, the protection characteristics of the fuse, the load and accurate level of the intestinal sensor, etc.
The role of high -voltage circuit breakers
Main role: The air load current that can cut or close the high -voltage line can cut or close the load current of the high -voltage line to cut or close the high -voltage line fault current
High -voltage circuit breaker working principle
When the vacuum circuit breaker is in the position of the closing gate, its opposite insulation supports the insulator tolerance. Once the lines connected to the real vacuum circuit breaker have permanent ground failure, after the circuit breaker moves, the ground failure point is not cleared, then there is an electric bus.The real space gap of the breaking of the section of the section must be endured; when various faults are open, the vacuum insulation gap between the tactile tentacles should tolerate the role of various recovery voltage without breakdown.Therefore, the insulation characteristics of the real space gap have become the main research topic to improve the voltage of the arc -extinguishing section fracture and make the single -cutting vacuum breakfast development towards high voltage level development.
High -voltage breaking circuit structure
The main structures of high -voltage circuit breakers are generally divided into: diversion parts, arc extinguishing parts, insulating parts, and operating mechanism parts.
High -voltage circuit breaker model
At present, my countrys high -voltage road cutter model is generally composed of text symbols and numbers in the following ways according to the national technical standards: its representative significance is: ① ——————————————————pot letters of product letters, expressed by the following letters: S -less oil breakfire; D — multiple Oil circuit breaker; K -air circuit breaker; L -hexal fluoride sulfur circuit breaker; Z -vacuum circuit breaker; Q — gas -producing circuit breaker; C -magnetic blower.② —— The location code of the device; n -indoor, W — outdoor.③ -Design series number; use numbers 1, 2, 3 ... indicate.④ -Rated voltage, KV.⑤ — Other supplementary work characteristics signs, G -improvement type, F -division operation.⑥ -rated current, A.⑦ -the rated turnover current, KA.For example: a high-composite circuit breaker model is: Zn10-10/300-750, which indicates the indoor real vacuum circuit breaker, the design serial number is 10, the rated voltage is 10kV, the rated current is 300A, and the rated break capacity is 750mva.

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