| 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 |
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
Covering 7.2kV, 12kV, 20kV, and 40.5kV, suitable for high-capacity distribution systems in 35kV to 220kV main grids and large industrial parks.
The peak short-circuit current can be limited to 20% to 45% of the expected value, significantly reducing the dynamic and thermal stability burden on equipment such as transformers and busbars.
Less than 40 micro ohms (μ Ω), with extremely low conduction loss, does not affect the normal operating efficiency of the system.
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