Multi-Dimensional Comprehensive Protection Capability

The device is equipped with phase-segregated current differential protection, providing high sensitivity to high-resistance faults while ensuring precise phase selection. It also integrates a broad suite of protection functions, including overcurrent, earth-fault, thermal overload, overvoltage, undervoltage, and underfrequency protection. A complete distance protection package is provided as a backup to differential protection, ensuring full line protection even in the event of a communication channel failure. Additionally, an out-of-step tripping function is supported to prevent system instability from propagating during loss of synchronism.

Flexible and Intelligent Control & Monitoring

The device supports single-phase, two-phase, and three-phase tripping, as well as automatic reclosing with both high-speed and delayed reclosing modes. Reclosing can be combined with synchronous check functions to ensure safe restoration of the line. A local HMI enables fast operation through a dual-position universal switch and a 32-position selector switch, while remote command capability allows seamless integration with higher-level SCADA systems. Combined with fault recording, fault location, and communication channel supervision, the system significantly improves fault analysis efficiency and helps operators quickly identify communication-related issues.

Highly Adaptable Expansion and Configuration

Each phase includes six stabilized current inputs, and the device can support up to five-terminal line protection in single-breaker schemes. In multi-breaker configurations, three-terminal line protection is achievable. The system accommodates up to six merging units, each providing eight analog channels, enabling full IEC 61850-9-2LE or digital-substation integration. Additional binary input/output boards can be installed as needed, and graphical configuration tools support the creation of advanced customized logic—such as interlocking schemes or load transfer functions—ensuring maximum flexibility for different network architectures.

Typical Application Scenarios

1. Core Power Transmission and Distribution

Ideal for UHV and EHV transmission lines, large substations, and multi-terminal network configurations. It provides protection for heavily loaded overhead lines, underground cables, and cable feeders connecting generator step-up (GSU) transformers. The device is compatible with single-bus, double-bus, and other complex busbar arrangements, making it a cornerstone protection solution for backbone grid infrastructure.

2. Key Industrial and New-Energy Power Systems

Widely applied in the petrochemical, metallurgical, mining, and heavy equipment manufacturing industries to safeguard critical high-voltage power lines and prevent production interruptions. It is also well-suited for the output protection of wind farms and photovoltaic plants, ensuring stable grid-connection of renewable energy and supporting secure operation of hybrid or mixed-energy systems.