air-injection switch-fuse combinations(FKN12A-12,F

FKN12A-12,FKRN12A-12 series air-injection switch-fuse combinations Main application: FKN12A-12D air-injection type load switch, FKRN12A-12D series air-injection type load switch-fuse combined electrical apparatus is suitable for 12Kv and below it of three-phase power distribution system as transformer, cable, overhead line and other power equipment for control and protection. It is especially suitable for urban, rural terminal substation and cubicle-type substation, and applies to looped network, biradial power supply unit for control and protection. FKN12A-12D series air-injection type load switch includes close load current and overload current. FKRN12A-12D series air-injection type load switch-fuse combined electrical apparatus includes close load current, overload current , Open circuit short circuit current. Ambient condition: Ambient air temperature: below 40 centigrade degree, above minus 25 centigrade degreeAltitude: less or equal to 1000metersRelative humidity on daily average is not more than 95 percent ,on month average not more than 90 percentSeismic intensity does not exceed 8 degreesNo fire and explosion danger, chemical corrosion and violent vibration of the place.Pollution level :IIStructural features: Load switch, disconnecting switch, fuse and mechanism in a framework, it could assembling flexibly, compact structure, small volume, convenient and simple installation.Fracture is direct-acting decorate, move and thermal stability current parameter is high, complete operation disposableWith static contactor insulation cover, power cable on the structure realize the isolation and leave out the alternate with insulation partitions, fracture insulation plug-in boards, can prevent arc in cabinet short-circuit accidentsWith unique trap structure, load switch break-brake, trap will automatically fracture isolation, protective performance is goodLoad switch, disconnecting switch and fuse has reliable mechanical locking device, satisfy "five-protection" requirementWith manual operation and ac-dc amphibious operational power supply electric operation two forms, is easy to realize power system "three-shake" requirementMain technical parameters: Table 1 Rated voltageRated frequencyRated currentRated insulation level one minute power frequency withstand voltage on earth, alternate with, isolation fracture draught of thunder withstand voltage(peak value) Rated short-time withstand voltage load switch earthed switchRated short-circuit duration time Rated short-circuit closing current(peak value)Rated breaking current active load breaking current closed loop breaking current Five percent meritorious load open circuit current cable charging current Open circuit no-load transformer capacityRated short-circuit breaking current(current limiting fuse)10. Rated transfer current 11. Mechanical life 12. Ram output energy Table 2 Fracture open distanceAlternate with center distanceAlternate with air gaptravel overtravelThree-phase off timeThree-phase break-brake timeshunt release inherent opening timemajor loop resistanceFKN12A-12D sidemount right operation Lateral inversion right operation FKRN12A-12D sidemount right operation, lateral inversion left operation Lateral inversion right operation, sidemount left operaion FKN12A-12D, FKRN12A-12D move drive mechanism sidemount right operation FKN12A-12D, FKRN12A-12D move drive mechanism sidemount left operation