T35 Microcomputer Integrated Relay Protection Device

The T35 is a digital, multifunction transformer protection relay designed for comprehensive monitoring, protection, and control of power transformers.

Overview

The GE Multilin T35 is a three-phase transformer protection system engineered to safeguard power transformers with up to six windings or restraints. It is part of the Universal Relay (UR) family, offering cost-effective, high-performance protection and control for transformer assets . The device integrates advanced protection algorithms, monitoring, and control functions, making it suitable for both primary protection and system automation applications .

Key Protection Features

• Differential Protection: Supports transformer differential zones with up to six three-phase current inputs, using a dual-breakpoint/dual-slope differential restraint characteristic to maintain stability during inrush or overexcitation conditions .
• Overcurrent and Overvoltage Protection: Provides fast and reliable detection of abnormal current and voltage conditions .
• Inrush and Overexcitation Inhibits: Includes 2nd and 5th harmonic blocking functions to prevent false tripping during transformer energization .
• Zero-Sequence Current Removal: Can remove zero-sequence currents even for delta-connected windings, accommodating various grounding configurations .
• CT Saturation and Failure Detection: Advanced algorithms maintain immunity to high AC and low DC saturation conditions caused by external disturbances .

Monitoring and Control Capabilities

• Voltage, Current, and Power Metering: Built-in metering provides RMS and fundamental frequency measurements .
• Event Recording and Oscillography: Captures fault events, breaker operations, and waveform data for diagnostics .
• FlexLogic™ Programmability: Allows custom tripping logic, interlocking with external devices, and dynamic setting group changes .
• Data Logging: Stores multiple settings and operational records for analysis and maintenance .

Communication and Integration

• SCADA/DCS Compatibility: Supports industry-standard protocols for seamless integration into automation systems .
• Fiber Optic Ethernet: Provides high-bandwidth, low-latency communication for relay control and data transfer .
• Redundant Ethernet Option: Enables fault-tolerant communication architectures without additional hardware .

Hardware and Installation

• Modular Design: Facilitates easy configuration, future upgrades, and integration with other UR relays .
• User Interface: Front panel display and Enervista UR Setup software allow configuration, monitoring, and diagnostics .
• Mounting and Wiring: Designed for straightforward installation in transformer substations .

Applications

The T35 is ideal for power transformer protection in industrial, utility, and substation environments, providing reliable protection, early fault detection, and integration with modern automation systems. Its combination of advanced protection algorithms, flexible logic, and communication capabilities ensures both security and operational efficiency .

In summary, the T35 Microcomputer Integrated Relay Protection Device is a versatile, high-performance solution for transformer protection, offering comprehensive monitoring, fault detection, and system integration features suitable for modern power networks.