GE T35

Description

Product Overview and Description

The GE T35 is a sophisticated transformer protection relay from GE’s Multilin series, designed specifically for the protection, control, and monitoring of power transformers in utility, industrial, and commercial applications. This device provides comprehensive protection functions for two-winding and three-winding transformers, including differential protection, overcurrent protection, and various other elements essential for transformer safety and reliability. The GE T35 integrates multiple protection functions, metering capabilities, and communication interfaces into a single compact unit, replacing numerous discrete protective devices and meters.

The T35 relay is engineered for operation in the demanding environments of electrical substations and industrial facilities, featuring rugged construction, high reliability, and user-friendly programming. The use of the GE T35 ensures comprehensive transformer protection, improved reliability, and simplified integration with substation automation and plant control systems, helping to prevent catastrophic transformer failures and extend equipment life.

Technical Parameters

Based on the analysis of GE Multilan T35 documentation, the GE T35 possesses the following key characteristics:

• Device Type: Transformer Protection Relay.
• Primary Function: Protection, control, and monitoring of two-winding and three-winding power transformers.
• Protection Functions: Comprehensive suite including:
  • Transformer differential protection (87T) with percentage restraint and harmonic blocking/restraint for inrush detection.
  • Restricted earth fault protection (64REF).
  • Overcurrent protection (50/51) for phase and ground faults.
  • Over/undervoltage protection (27/59).
  • Over/underfrequency protection (81O/U).
  • Thermal overload protection (49).
  • Breaker failure protection (50BF).
  • And many more programmable protection elements.
• Metering: Real-time metering of voltages, currents, power (MW, MVAR), power factor, frequency, and energy.
• Inputs/Outputs: Multiple analog inputs (CTs, VTs), digital inputs, and relay outputs (configurable based on ordering options).
• Communication Protocols: Supports multiple protocols including Modbus RTU, DNP3, IEC 60870-5-103, IEC 61850, and PROFIBUS.
• Power Supply: Wide-range power supply suitable for substation battery systems (typically 24-250V DC or 90-265V AC).
• Display: Front-panel LCD display for local monitoring, programming, and event viewing.
• Event Recording: Records events, waveforms, and disturbances for post-event analysis.
• Mounting: Panel-mount design for switchgear or control panel installation.
• Part Number: GE T35 is the base model identifier, with specific ordering codes for different options.

Advantages and Key Features

The GE T35 offers several critical advantages for transformer protection:

• Comprehensive Protection: The T35 integrates all necessary transformer protection functions into a single device, simplifying protection schemes and reducing panel space requirements.
• Advanced Transformer Protection: Features such as harmonic blocking/restraint ensure secure differential protection during transformer energization, preventing nuisance trips due to inrush currents.
• Flexible Configuration: The GE T35 offers extensive programmable logic and flexible I/O configuration, allowing adaptation to specific application requirements.
• Event Recording: The relay records events, waveforms, and disturbances, providing valuable data for post-event analysis and system troubleshooting.
• Communication Capabilities: With support for multiple protocols including IEC 61850, the GE T35 integrates seamlessly with modern substation automation systems.

Application Cases in Key Industries

The GE T35 is used in a wide variety of power system applications:

• Utility Substations: The T35 provides primary protection for power transformers in transmission and distribution substations, ensuring grid reliability.
• Industrial Power Distribution: In manufacturing plants, refineries, and other industrial facilities, the GE T35 protects transformers feeding critical loads.
• Power Generation: The relay protects generator step-up transformers and station service transformers in thermal, hydro, and renewable power plants.
• Commercial Buildings: In large commercial complexes, the T35 protects main distribution transformers.
• Mining and Heavy Industry: The GE T35 protects transformers powering mining operations and heavy industrial processes.

Comparison with Competitors

In the transformer protection relay market, GE’s primary competitors are Siemens (7UT series), ABB (RET series), Schneider Electric (MiCOM P63x), and SEL (SEL-387, SEL-487).

• GE T35 vs. Siemens 7UT: Both offer comprehensive transformer protection. The T35 is particularly strong in applications requiring advanced communications including IEC 61850, and in installations where GE Multilan is the standard.
• GE T35 vs. ABB RET: ABB’s RET series is a strong competitor. The GE T35 offers comparable protection functions with the advantage of GE’s extensive application engineering support.
• GE T35 vs. SEL-387/SEL-487: SEL relays are known for their simplicity and reliability. The T35 offers more advanced communications and programmable logic capabilities.

Selection Recommendations and Precautions

1. Transformer Specifications: Select the GE T35 based on your transformer’s size, voltage class, winding configuration, and protection requirements.
2. CT/VT Ratings: Ensure the relay’s input ratings match your transformer’s current transformer (CT) and voltage transformer (VT) secondary ratings (e.g., 1A or 5A, 120V or 240V).
3. Protection Settings: Configuration of protection settings for the GE T35 must be performed by qualified protection engineers based on transformer characteristics and system studies.
4. Communication Integration: If integrating with substation automation or SCADA systems using IEC 61850 or other protocols, ensure proper network configuration and engineering.
5. Qualified Personnel: Installation, commissioning, and maintenance of the GE T35 should only be performed by qualified personnel with appropriate training in transformer protection and safety clearances for working with high-voltage equipment.

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