| Brand | ROCKWILL |
| Model NO. | High - voltage pneumatic load break switch |
| Rated voltage | 12kV |
| Rated normal current | 630A |
| Rated frequency | 50/60Hz |
| Series | FN |
The s high - voltage pneumatic load break switches and their combined electrical appliances are indoor high - voltage switchgear for AC 12kV, 50Hz. This load break switch features high specific technical parameters and reliable action. The basic form of the operating mechanism is manual spring - energy - storage type, and it can also be equipped with an electromagnetic spring operating mechanism. Based on the pneumatic arc - extinguishing principle, it can interrupt multiple times without replacing the arc - extinguishing tube.
The high - voltage load break switch can close, carry and open load currents under normal circuit conditions, and has the capability to close short - circuit currents and open short - circuit currents within a specified short time.
The load break switches can be equipped with earthing switches. The earthing switch has the same short - circuit making capacity as the load break switch, as well as the dynamic and thermal stability capability, and has a strict mechanical interlock with the load break switch, ensuring that misoperation is impossible in terms of structure.
When the FN-12 load break switch is equipped with a high - voltage current - limiting fuse (with a striker) to form a load break switch - fuse combination, it serves as overload and short - circuit protection for loads (such as power transformers). When one or more phases of the fuse blow, the three phases of the load break switch automatically open.
The high - voltage load break switch is suitable for installation in ring - main unit switch cabinets and other types of switch cabinets for receiving and distributing electrical energy.
|
Serial No. |
Name |
Unit |
Value |
|
1 |
Rated Voltage |
kV |
12 |
|
2 |
Rated Frequency |
Hz |
50 |
|
3 |
Rated Current |
A |
630 |
|
4 |
Maximum Rated Current of Fuse |
A |
100 |
|
5 |
Rated Active Load Breaking Current, Rated Closed - loop Breaking Current |
A |
630 |
|
6 |
Rated Short - time Withstand Current (2S) |
kA |
20 |
|
7 |
Rated Short - circuit Making Current, Rated Peak Withstand Current |
kA |
50 |
|
8 |
1min Power Frequency Withstand Voltage, Phase - to - phase and to - ground / Break |
kV |
42/48 |
|
9 |
Lightning Impulse Withstand Voltage (Peak Value), Phase - to - phase and to - ground / Break |
kV |
75/85 |
|
10 |
Rated Cable Charging Breaking Current |
A |
10 |
|
11 |
Rated Breaking of No - load Transformer |
kVA |
1250 |
|
12 |
Mechanical Life |
Times |
2000 |
|
13 |
Rated Breaking Transfer Current |
A |
1150 |
|
14 |
Rated Short - circuit Breaking Current of Fuse |
kA |
31.5 |
Main Mechanical Characteristics of Load Break Switch
| Serial No. | Name | Unit | Value | Remarks |
|---|---|---|---|---|
| 1 | Phase-to-phase Center Distance | mm | 210 ± 3 | |
| 2 | Total Stroke of Conductive Rod | mm | 215 ± 5 | |
| 3 | Distance Between Moving and Static Arc Contacts at Opening Position | mm | >160 | |
| 4 | Over-stroke of Electrical Contact of Moving Contact Rod | mm | 42 ± 3 | |
| 5 | Just-Opening Speed | m/s | >2.7 | |
| 6 | Three-phase Closing Asynchronism | ms | ≤10 | Contact between moving contact rod and contact fingers |
| 7 | Three-phase Opening Asynchronism | ms | ≤5 | Separation between moving contact rod and contact fingers |
Operating Environmental Conditions
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