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Product Overview

The T35 (Model: T35J03AKHF8MH6DM8RP6EU67WXX) is a sophisticated transformer protection system within the GE Multilin Universal Relay (UR) family, designed for primary and back-up protection of medium to large power transformers. This specific configuration, identified by the order code T35-J03-AKH-F8M (Part Number: T35-J03-AKH-F8M), is engineered to handle complex transformer topologies, including three-winding units within dual-breaker or breaker-and-a-half bus arrangements.

As a high-integrity protective device, the T35 (Model: T35J03AKHF8MH6DM8RP6EU67WXX) utilizes advanced percentage differential elements with harmonic restraint to prevent nuisance tripping during magnetizing inrush. It integrates restricted earth fault (REF), overexcitation monitoring (V/Hz), and thermal overload protection into a single modular chassis. Supporting the latest digital substation standards such as IEC 61850 and IEEE C37.118 Synchrophasors, this relay provides the high-speed processing and cybersecurity features required for modern grid stability and wide-area monitoring.

Detailed Technical Specifications

The T35 system provides comprehensive protection through a modular hardware set optimized for utility-grade reliability.

  • Manufacturer: GE Multilin (GE Grid Solutions)

  • Model Number: T35J03AKHF8MH6DM8RP6EU67WXX

  • Order Code: T35-J03-AKH-F8M

  • Series: UR (Universal Relay) Transformer Protection

  • Differential Inputs: Up to 6 sets of CT inputs for multi-winding restraint

  • Protection Functions:

    • Differential Protection (87T) with 2nd and 5th harmonic restraint

    • Restricted Earth Fault (87N/REF)

    • Phase, Neutral, Ground Overcurrent (50/51, 50N/51N)

    • Overexcitation (24) and Volts/Hertz monitoring

    • Under/Overvoltage (27/59) and Frequency (81)

  • Logic Engine: FlexLogic™ for custom automation and interlocking

  • Communication Protocols: IEC 61850, Modbus TCP/RTU, DNP 3.0, EGD

  • Synchrophasor Support: Embedded PMU functionality (IEEE C37.118)

  • Monitoring: Transformer health and thermal modelling (RTD support)

  • Data Logging: 64-sample/cycle oscillography; 1024-event SOE recorder

  • Security: CyberSentry™ Role-Based Access Control (RBAC)

  • Environmental Rating: –40°C to +85°C operating range

  • Chassis Size: Standard 19-inch rack mount (4U height)

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