Description
The GE Multilin L30 is a highly robust line current differential protection relay engineered for sub-transmission and medium-voltage power systems. As a foundational component of the Universal Relay (UR) series, it synthesizes advanced protection, metering, and control logic into a modular platform, ensuring high-speed tripping and superior fault detection for complex power lines and cable networks.
Key Technical Specifications
- Primary Protection: High-speed current differential protection using an adaptive restraint characteristic to distinguish between internal faults and high-current external through-faults.
- System Architecture: Built on the modular UR platform, allowing for field-swappable I/O modules and flexible hardware configuration.
- Inter-relay Communication: Supports diverse digital communication interfaces including direct fiber optics, RS422, G.703, and C37.94 protocols.
- Wide-Area Connectivity: Fully compatible with Routable GOOSE (R-GOOSE) for wide-area protection and coordination across multiple substations.
- Protocol Compliance: Integrated support for IEC 61850 (Ed. 1 and Ed. 2) for seamless digital substation integration and process bus application.
- Advanced Monitoring: Includes a native Phasor Measurement Unit (PMU) compliant with IEEE C37.118 and IEC 61850-90-5 for real-time grid stability analysis.
- Cybersecurity: Implements CyberSentry™ technology to enforce NERC® CIP compliance, including Role-Based Access Control (RBAC) and robust user authentication.
- Data Acquisition: High-speed waveform capture and event recording, providing granular detail for post-fault analysis without external fault recorders.
- Fault Detection: Enhanced security during CT saturation events, ensuring the relay does not nuisance-trip during heavy external system disturbances.
- Flexible Tripping: Supports three-pole tripping with independent synchrocheck supervision and automated reclosing logic.
Related GE Universal Relay (UR) Series Recommendations
For comprehensive substation protection and automation, the L30 is frequently paired or replaced with the following models within the UR ecosystem:
- D60: Line distance protection relay for long-distance transmission lines.
- L90: Line differential protection relay for high-voltage, multi-terminal lines.
- T60: Transformer management relay for protection and control of power transformers.
- B30: Busbar protection relay designed for substation busbar zones.
- F60: Feeder management relay for medium-voltage distribution systems.
- M60: Motor protection relay optimized for large industrial motors.
- G60: Generator protection relay for power plant applications.
- C60: Breaker management relay for specialized circuit breaker control.
- C70: Capacitor bank protection relay for power factor correction assets.
- UR Plus: An integrated rack solution combining multiple UR devices into a single, pre-wired panel package.
