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

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