Indoor Medium Voltage Earthing switch, type JN15-12
JN15-12 series Indoor Medium Voltage Earthing switch (ES) is used in Indoor Medium Voltage Switchgears for electrical networks with 3-phase AC current with rated voltage 12 kV rated frequency 50/60 Hz. Earthing switch is equipped with spring tumbler operating mechanism, which allows to proceed with ON/OFF operations independent from the maintenance staff speed. Opposite to EK6-12, Earthing switch JN15-12 has post insulators and static contacts already installed on the ES frame. Optionally, post insulators can be changed to capacitive insulators for voltage indication. Force transmission from ES Operating mechanism to ES JN15-12 is proceeded with rod gear with adjustable rod length. This solution allows to place Operating mechanism and Earthing switch in different heights inside designed switchgear only by changing the rod length. For visible control of ON/OFF position, the ES is equipped with position marker. ES operating mechanism is equipped with auxiliary switches for using it's signals in secondary control circuits. Earthing switch can be equipped both manual and motor operating mechanism. In case of motor operating mechanism, ES can also be operated manually. ES operating mechanism is equipped with all necessary interlocks, including chassis cart draw in/out interlock, door interlock. Optionally ES operating mechanism can be equipped with electric magnet interlocks.
Example: Indoor Medium Voltage Earthing Switch type JN15 rated voltage 12 kV, rated short current 31,5 kA, distance between phases 210 mm, manual operating mechanism – JN15-12/31,5-210. In case of motor operating mechanism, the same ES will be - JN15-12/31,5-210-M.
|2||Rated short-time withstand current, 1 sec||kA||20; 25; 31,5; 40|
|3||Rated peak withstand current||kA||81|
|4||1 min industrial frequency voltage withstand||kV||42|
|7||Mechanical durability (ON-OFF total cycles)||cycles||1000|
|8||Distance between phases*||mm||150; 210; 275|
* - Parameters, which can be customized by customer
On request, operating mechanism parts can be customized according to customer's sizes. Optionally, operating mechanism can be equipped with door interlock, back panel interlock and electromagnet interlock, which layouts can be sent on request. All ES and Operating mechanism parts can be supplied separately. For ES models with distance between phases 150 mm, set of supply includes 2 pcs plastic insulating separators, which shall be installed between ES contacts. Optionally, post insulators can be changed to capacitive insulators for voltage indication.