DGXK2 Large-Capacity High-Speed Current-Limiting Switchgear

The DGXK2 Large-Capacity High-Speed Current-Limiting Switchgear is an integrated protection device specifically designed for medium and high voltage (mainly 35kV/110kV) large-capacity power distribution systems. It integrates high-speed switching technology, intelligent current-limiting algorithms, and complete cabinet structures. Its core function is to respond quickly within ≤10ms after a short-circuit fault occurs, through the logic of "first limiting current, then breaking", suppressing the actual short-circuit current peak in the fault circuit to 15%-50% of the expected value, and then safely cutting off the fault circuit.

This device can not only be independently applied to power plant branch busbars and industrial park main distribution lines, but also can be assembled into complete cabinets with vacuum circuit breakers, disconnectors and other equipment, adapting to indoor/outdoor multi-scene installation. Its design purpose is to solve the pain points in large-capacity power distribution systems such as "equipment burnout caused by excessive short-circuit current" and "accident expansion caused by slow response of traditional switches". At the same time, it reduces the requirements for dynamic and thermal stability parameters of transformers, cables and other equipment in the power grid, helping the power system achieve the dual goals of "safety protection + cost optimization".

Features

• Dual Advantages of Large-Capacity Carrying and High-Speed Breaking：The rated current covers 630A-2500A, and the rated breaking current can reach 200kA, meeting the large-capacity power supply needs of large industrial parks and regional distribution networks; the breaking time is ≤10ms, which is much faster than traditional circuit breakers (30-50ms), and can complete fault isolation before the short-circuit current rises to the peak, avoiding the equipment from bearing extreme impacts.

• Significant Current-Limiting Characteristics, Reducing System Losses：Built-in dedicated current-limiting module, through the synergistic effect of electromagnetic induction and mechanical braking, controls the actual short-circuit current peak to 15%-50% of the expected value, greatly reducing the electric power impact of short-circuit current on generators and transformers, while reducing power loss during faults, indirectly improving power grid operation efficiency.

• Multi-Scenario Adaptation, High Installation Flexibility：Supports two installation environments: indoor (IP4X protection) and outdoor (IP54 protection), adapting to different climatic conditions; it can be installed separately at key nodes of the line, or assembled into complete cabinets with vacuum circuit breakers, load switches, etc. (such as TXB3 series cabinets), meeting the diversified layout needs of "decentralized protection + centralized management and control" of the power grid.

• Intelligent Integrated Design, Convenient Operation and Maintenance：Integrated with electronic measurement and control unit and condition monitoring module, it can collect real-time operating data such as current and temperature, supports remote communication (compatible with Modbus and IEC 61850 protocols), facilitating operation and maintenance personnel to remotely monitor equipment status; the structure adopts a modular design, and core components can be disassembled and replaced, without the need for overall power outage during maintenance, shortening the power outage time.

Main Parameters

Product Usage

• Bypass current limiting reactor (energy saving and consumption reduction, eliminating reactor reactive power, improving power supply quality)

• Parallel operation of segmented buses in large-capacity power distribution systems (optimize load distribution and reduce network impedance)

• Short circuit protection at the generator outlet or on the low voltage side of the transformer