Product Overview
The FKN12A-12D compressed-air load break switch and the FKRN12A-12D series of compressed-air load break switch-fuse combination apparatus are suitable for use in three-phase distribution systems of 12kV and below. They serve for the control and protection of power equipment such as transformers, cables, and overhead lines. They are particularly suitable for terminal substations and compact substations in urban and rural power networks. They are also applicable for the control and protection of ring main units and double-feed supply units.
The FKN12A-12D series compressed-air load break switches can interrupt load current and overload current.
The FKRN12A-12D series compressed-air load break switch-fuse combination apparatus can interrupt load current, overload current, and line short-circuit current.
Technical Specifications
|
S.Q. |
Item |
Unit |
FN12-12/630 |
FNR12-12/100-31.5 |
|
1 |
Rated Voltage |
KV |
12 |
|
|
2 |
Rated Frequency |
HZ |
50 |
|
|
3 |
Rated Current |
630 |
125 |
|
|
4 |
Lightning Impulse Withstand Voltage |
KV |
75 to ground and between phases, 85 for isolating distance |
|
|
5 |
Power Frequency Withstand Voltage (1 min) |
KV |
42 to ground and between phases, 48 for isolating distance |
|
|
6 |
Rated Short-time Withstand (Thermal) Current |
KA |
20(4S) |
|
|
7 |
Rated Peak Withstand (Dynamic) Current |
KA |
50 |
|
|
8 |
Rated Short-circuit Making Current (Peak) |
KA |
50 |
50 |
|
9 |
Rated Short-circuit Breaking Current (Prospective) |
KA |
31.5 |
|
|
10 |
Rated Transfer Current |
KA |
1.5 |
|
|
11 |
No-load Transformer Breaking Capacity |
KVA |
1250 |
|
|
12 |
Rated Cable Charging Current |
A |
10 |
|
|
13 |
Mechanical Endurance |
KA |
4000 |
|
|
14 |
Fuse Actuated Switch Opening Time |
S |
<0.06 |
|
|
15 |
Earthing Switch Short-time Withstand Current |
KA |
20(2S) |
|
|
16 |
Earthing Switch Peak Withstand Current |
KA |
50 |
|
|
17 |
Control Circuit Supply Voltage |
KA |
AC/DC 110,220 |
|
Model Designation Breakdown
FKN 12 A - 12 D / T 630 - 20
F: Load Break Switch
K: Air Insulation
N: Indoor
12: Design Sequence
A: Derivative Code
-: Separator
12: Rated Voltage (kV)
D: Earthing Switch
/T: Spring-operated Mechanism
630: Rated Current (A)
-: Separator
20: Rated Short-time Withstand Current (kA)
FKRN 12 A - 12 D / T 630 - 20
F: Load Break Switch
K: Air Insulation
R: Fuse
N: Indoor
12: Design Sequence
A: Derivative Code
-: Separator
12: Rated Voltage (kV)
D: Earthing Switch
/T: Spring-operated Mechanism
630: Rated Fuse Current (A)
-: Separator
20: Rated Short-circuit Breaking Current (kA)
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