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The ZN85-40.5/T2000-31.5 indoor HV vacuum breaker(short for breaker)is used for switching on/off load current,over load current,fault current in industrial and mining establishments,power plants and transformer substations with trhree-phase AC 50HZ,rated voltage 40.5KV power system. The breaker and operating mechanism use up-under arrangement stucture,reducing the depth of the breaker effectively.The three-phase explosion chamber and phase-associative electrfied body are separated by three indepen dent epoxy resin insulating cylinder ,forming compound insulation structure.The breaker is up to the request of air and creepage distance in normal working conditions,and reduces size of the breaker effectively.Main galvanic circle vacuum explosion chamber and dynamic and static conduction connecton is installed into the insulating cylinder,making phase to phase only 300mm, Main cycle electrical connectons all use fixed connections,having high reliability.The insulating cylinder is installed on the breaker’s frame.The spring operating mechanism,designed for this new breaker,is installed in the breaker’s overall structure.Having simple structure desing,its output curve and perfomances are more suitable for requests of the 40.5kV vacuum breaker.With reasonable general planning,goodly and compact outline,small size and flexible operation,the break has features of reliable electric specification,long life,easy to check and non maintenance of the mechanism.The breaker is used for operating frequently and in some places with difficuit working conditions.
| Item | Unit | Parameter |
| Rated voltage | KV | 40.5 |
| Rated frequency | HZ | 50 |
| Rated current | A | 1250 1600 2000 |
| Rated short circuit breaking current | KA | 25 31.5 40 |
| Rated short current switching current(Peak value) | KA | 63 80 100 |
| Rated peak value withstand current | KA | 25 31.5 40 |
| Rated peak value withstand current | KA | 63 80 100 |
| Power frequency wtihstand voltage | KV | 95 |
| Lightning impulse withstand voltage(Peak value) | KV | 185 |
| Rated operating sequence | O-0.3s-CO-180s-O | |
| Breaking current frequency under rated short circuit | Times | 20 |
| Mechanical life | 10000 | |
| Breaking time | ms | ≤80 |
| Single capacitor bank breaking current | A | 630 |
| Back to back capacitor bank breaking current | 400 | |
| Rated operating voltage | V | DC/AC:100/200 |
Manufacturer of power transmission and distribution equipments.
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