UR 77H/UR7CH GE Multilin Fiber-Optic Inter-Relay Communications Module

Overview  

The GE UR77H Inter-Relay Communications Module, part of the Multilin Universal Relay (UR) series, is engineered to enable high-speed fiber-optic communication between UR relays. It supports teleprotection, fast tripping, and coordinated control, ensuring secure and reliable data exchange in modern power system protection schemes.

Technical Specifications

• Manufacturer: General Electric (GE)

• Model: UR77H

• Type: Inter-Relay Communications Module

• Function: Relay-to-relay communications

• Communication Standard: IEEE C37.94

• Transmission Medium: Multimode fiber optic

• Wavelength: 820 nm

• Number of Channels: 2

• Indicators: LED status indicators for diagnostics

• Mounting Orientation: Horizontal installation within UR chassis

• Dimensions: 280 mm × 115 mm × 45 mm

• Weight: 0.6 kg

• Country of Origin: USA

Key Features

• Enables exchange of digital status and analog values between UR relays

• Supports fast tripping and teleprotection applications

• Noise-immune fiber-optic communication for reliable performance

• Compact modular design for seamless integration into UR systems

• Built for demanding industrial and utility environments

Applications

• Substation automation requiring relay-to-relay communication

• Power system protection and coordination

• Teleprotection schemes for transmission lines

• Industrial control systems with distributed relay networks

FAQ

• Q: What communication standard does the UR77H support?  A: It complies with IEEE C37.94 for inter-relay communication.

• Q: How many channels are available?  A: The UR77H provides 2 fiber-optic channels.

• Q: What wavelength does the module operate at?  A: It uses 820 nm multimode fiber optic transmission.

• Q: Is the UR77H suitable for teleprotection?  A: Yes, it is specifically designed for fast tripping and teleprotection applications.