High-Current Current-Limiting Circuit Breaker/Short-Circuit Current Limiter(FCL)
Key attributes
| Brand | RW Energy |
| Model NO. | High-Current Current-Limiting Circuit Breaker/Short-Circuit Current Limiter(FCL) |
| Rated voltage | 20kV |
| Rated normal current | 1250A |
| Rated frequency | 50/60Hz |
| Series | DDXK |
Product descriptions from the supplier
Product Introduction
A core protection component for high-capacity power systems (35kV-220kV grids, industrial parks), the FCL responds in ≤10ms to short-circuit faults. It limits peak fault current to 15%-50% of the expected value before safe breaking, shielding generators/transformers. Supporting 630A-4000A current ratings, it fits AC/DC systems and integrates with switchgear for stable grid operation.
Feature
High-Speed Interruption: It operates and interrupts the short-circuit current at the front part of the first power frequency half-cycle of the short-circuit current—well before the current rises to its peak. The total interruption time is 2–5 ms, approximately 10–20 times faster than that of conventional circuit breakers.
Current-Limiting Interruption: It starts limiting the short-circuit current 1 ms after a short-circuit occurs, and finally restricts the short-circuit current to 15%–45% of the expected value.
High Interruption Capacity: The rated prospective short-circuit interruption current ranges from 63 kA to 200 kA, while the rated short-circuit interruption current of currently common circuit breakers usually only reaches 40.5 kA to 50 kA.
Built-in Rogowski Current Sensor: It features accurate measurement, fast response speed, and can be arranged in a phase-separated manner or integrated into switchgear cabinets.
High Reliability: One of the product’s competitive advantages is its outstanding reliability. Special design and craftsmanship ensure the product’s high reliability, which has been verified and well-received in on-site applications.
Main Parameters
No. |
Item |
Unit |
Technical Parameters |
|
1 |
Rated Current |
A |
630~6300 |
|
2 |
Rated Voltage |
kV |
7.2/12/20/40.5 |
|
3 |
Rated Frequency |
Hz |
50/60 |
|
4 |
Rated Prospective Short - Circuit Breaking Current |
kA |
63/80/120 |
|
5 |
Rated Insulation Level (Power Frequency / Lightning) |
7.2kV |
kV |
23/60 kV |
12kV |
42/75 kV |
|||
20kV |
50/125 kV |
|||
40.5kV |
95/185 kV |
|||
6 |
Breaking Time |
ms |
2~5ms |
|
7 |
Cut - off Current / Prospective Short - Circuit Current Peak Value |
% |
20~45 |
|
8 |
DC Resistance of Main Circuit |
μΩ |
＜40 |
|
9 |
Operating Current Setting Range |
kA |
6kA~60kA |
|
10 |
Rated Breaking Current of Fuse |
kA |
63/120 |
|
11 |
Rated Short - time Withstand Current of Main Circuit |
kA/s |
31.5/2 |
|
12 |
Rated Peak Withstand Current of Main Circuit |
kA |
80 |
|
Figure 4: Using DDXK1 as rapid short-circuit protection for generators and transformers
(a) Rapid short-circuit protection at the 10kV/35kV side outlet of transformers
(b) Rapid short-circuit protection at generator outlets
(c) Rapid short-circuit protection for power plant branch busbars
(d) Rapid short-circuit protection at grid-connected generator outlets
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