| Brand | ROCKWILL |
| Model NO. | High - voltage pneumatic load break switch |
| Rated voltage | 12kV |
| Rated normal current | 630A |
| Rated frequency | 50/60Hz |
| Series | FKN |
Product Overview
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.
Key Features
When the FKN12 - 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.
Technical Parameters
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 at Opening Position |
mm |
>160 |
|
4 |
Over - stroke of Electrical Contact of Moving Contact Rod |
mm |
42 ± 3 |
|
5 |
Just - Closing Speed |
m/s |
3.8 <sup>+0.7</sup><sub>-0.2</sub> |
|
6 |
Just - Opening Speed |
m/s |
>2.7 |
|
7 |
Three - phase Closing Asynchronism |
ms |
>10 |
Contact between moving contact rod and contact fingers |
8 |
Three - phase Opening Asynchronism |
ms |
>5 |
Separation between moving contact rod and contact fingers |
Operating Environmental Conditions
Altitude: Not exceeding 1000m.
Ambient Temperature: Maximum +40°C, Minimum -10°C.
Relative Humidity: Daily average not exceeding 95%, Monthly average not exceeding 90%.
Seismic Intensity: Less than 8 degrees.
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