OKT - Cable-rod disconnector
Application:
OKT – Single-pole cable-rod disconnectors are devices used to connect and disconnect electric circuits without load and return cables in negative cells in traction substations and in industry. The OKT two-pole disconnector enables electrical or manual connection of both poles.
Advantages:
- simple, reliable construction
- small dimensions
- silver-plated contacts with Cu / Ag antimony 10 um bc
- possibility to attach auxiliary contacts on closing and opening
- high rated short-circuit withstand
Technical data:
| Outdoor thermal current | 1250 A and 1600 A |
| Rated voltage | 1,5 kV up to 3,6 kV |
| Rated insulation voltage | 4800 VDC |
| Working temperature | -5oC up to +40oC |
| Mechanical durability | 20 000 cycles |
| Level of protection | IP00 |
Auxiliary contacts:
If necessary, it is possible to install auxiliary contacts. They are fastened one pair on the disconnector
base and one on the closure and one on the NO / NC opening. In addition to the isolating clearance, they
confirm with a limit switch signal.
- Number of contacts in a unipolar device: 1NO + 1 NC
- Number of contacts in a two-pole device: 3NO + 3NC
- Rated operating voltage: 24-230V DC
- Rated current: 0,27 A
- Minimum current flow at 24 VDC: 1 mA
Construction:
Single-pole disconnector type OKT consists of a steel galvanized base on which epoxy resin insulators for the voltage of 1,8 or 3,6 kV are attached. Fixed, silver-plated contacts are screwed to the insulators, and the movable contact is pulled off by means of an insulating pole, which is a isolating clearance in the air after opening. The apparatus should be mounted in such a way that the movable contact opens downwards and in no way can it fall by gravity - uncontrollably onto the fixed contacts, causing the circuit to close. In the OKT type bipolar disconnector, the moving contacts are coupled with the shaft and they can be opened manually or with the use of a drive mounted on the disconnector’s frame.
Marking:
|
TYPE |
DISCONNECTOR |
OKT -MARKING |
|
Voltage |
1500 V DC |
15 |
|
3600 V DC |
36 |
|
|
Thermal current in open air |
1250 A |
12 |
|
1600 A |
16 |
|
|
Number of poles |
1 |
1 |
|
2 |
2 |
|
|
Drive |
MANUAL |
H |
|
MOTOR |
M |
|
|
Drive's voltage |
MANUAL |
0 |
|
24 V DC |
1 |
|
|
220 V DC |
2 |
|
|
230 V AC |
3 |
|
|
Number of auxiliary contacts |
WITHOUT |
0 |
|
1NO+ 1 NC |
1 |
|
|
3NO+3NC |
3 |
|
Name of the disconnector |
OKT |
|
. |
|
. |
|
. |
|
. |
|
. |
|
|
Rated voltage |
|
15 |
. |
|
. |
|
. |
|
. |
|
. |
|
|
Contractual current |
|
|
. |
12 |
. |
|
|
|
|
|
|
|
|
Number of poles |
|
|
. |
|
. |
1 |
. |
|
. |
|
. |
|
|
Drive |
|
|
. |
|
. |
|
. |
H |
. |
|
. |
|
|
Drive's voltage |
|
|
. |
|
. |
|
. |
|
. |
0 |
. |
|
|
Number of auxiliary contacts |
|
|
. |
|
. |
|
. |
|
. |
|
. |
0 |
|
Proper marking |
OKT |
15 |
. |
12 |
. |
1 |
. |
H |
. |
0 |
. |
0 |
Order example:
Indoor disconnector OKT 15.12.1.H.0.0
Cable-pole disconnector for rated voltage max. 1500 VDC, rated current max. 1250 A, single-pole, pole-opened, without signal limit switches.
Indoor disconnector OKT 36.16.2.M.2.3
Cable disconnector for max voltage 3600 V DC, rated current max 1600 A, two-pole with a motor drive, voltage 220 VDC and auxiliary switches 3NO + 3NC
Note: For technical reasons, some options and configurations cannot be combined in the designation code.
Technical drawings:
Certificates:
All technical data presented in the catalog can be changed due to technological progress.
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