FKRN12-12 Indoor high voltage load switch
Model and meaning

Normal use environment
◆Ambient air temperature upper limit: +40℃ lower limit -25℃
◆Altitude not exceeding 1000m;
◆The daily average relative humidity is not more than 95%, and the monthly average is not more than 90%.
◆The earthquake intensity does not exceed 8 degrees;
◆A place without fire, explosion hazard, chemical corrosion and severe vibration;
◆Filth level:Ⅱ
Main Features
◆The load switch, grounding switch, fuse and mechanism are on one frame, which can be flexibly combined, with compact structure, small size and convenient installation;
◆The fracture is arranged in direct action, with high dynamic and thermal stability current parameters, and the operation can be completed in one go;
◆With the static contact insulation cover, the ring network cabinet is isolated in structure, eliminating the interphase insulation partition and the break insulation plug board, which can prevent arc short circuit accidents in the cabinet;
◆With a unique valve structure, after the load switch is opened, the valve automatically isolates the break, with good protection performance;
◆There is a reliable mechanical locking device between the load switch, grounding switch and fuse to meet the "five protection" requirements;
◆It has two modes: manual operation and electric operation with AC/DC dual-purpose operating power supply, which is convenient for realizing the "three remote" requirements of the power system.
Technical Parameters
|
Name |
Unit |
FKN12A-12D |
FKRN12A-12D |
||
|
Rated voltage |
kV |
12 |
12 |
||
|
Rated frequency |
Hz |
50 |
50 |
||
|
Rated current |
A |
630 |
125 |
||
|
Rated insulation level |
1 min power frequency withstand voltage |
To ground, between phases |
kV |
42 |
42 |
|
Isolation fracture |
48 |
48 |
|||
|
Lightning impulse withstand voltage (peak value) |
To ground, between phases |
75 |
75 |
||
|
Isolation fracture |
85 |
85 |
|||
|
Rated short-time withstand current |
Load switch |
kA |
20 |
- |
|
|
Earthing switch |
20 |
||||
|
Rated short circuit duration |
Load switch |
s |
4 |
- |
|
|
Earthing switch |
2 |
||||
|
Rated short-circuit making current (peak value) |
kA |
50 |
- |
||
|
Rated breaking current |
Active load breaking current |
A |
630 |
- |
|
|
Closed loop breaking current |
630 |
- |
|||
|
5% active load breaking current |
31.5 |
- |
|||
|
Cable charging current |
10 |
- |
|||
|
Breaking capacity of no-load transformer |
KVA |
1250 |
|||
|
Rated short-circuit breaking current (current limiting fuse) |
kA |
- |
31.5 |
||
|
Rated transfer current |
A |
- |
1200 |
||
|
Mechanical life |
Second-rate |
2000 |
2000 |
||
|
Impactor output energy |
J |
- |
1+0.5 |
||
Table 1
|
Name |
Unit |
Numeric |
|
Fracture distance |
mm |
≥175 |
|
Phase center distance |
mm |
210±2 |
|
Air gap between phases |
mm |
≥125 |
|
journey |
mm |
210±4 |
|
Overtravel |
mm |
≥40 |
|
Three-phase closing at different times |
ms |
≤10 |
|
Three-phase disconnection at different times |
≤5 |
|
|
Inherent opening time of shunt release |
ms |
40-65 |
|
Main circuit resistance |
μΩ |
≤130 |
Table 2
Installation Dimensions




