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GE Multilin T35-N03-HCH-F8F-H6C-M8F-P6D-06D-WXX Transformer Protection Relay

The GE Multilin T35-N03-HCH-F8F-H6C-M8F-P6D-06D-WXX, also cataloged as the T35 Transformer Protection Relay, operates as a dedicated hardware component for three-phase transformer differential protection within GE Universal Relay (UR) substation automation systems. The relay performs current acquisition, protection logic execution, event recording, and communication processing through modular I/O and network interfaces.

Hardware Specifications

Parameter	Specification
Model	T35-N03-HCH-F8F-H6C-M8F-P6D-06D-WXX
Brand	General Electric (GE Multilin)
Origin	GE Grid Solutions
Dimensions	19-inch rack chassis, horizontal mount
Operating Temp	-20 deg C to +60 deg C
Power Consumption	Not specified in available documentation
Product Series	Universal Relay (UR) Family
Base Function	Transformer Protection System
Power Supply	High Voltage Power Supply, 125 / 250 VAC/DC
CPU Module	Standard CPU Module
HMI Interface	Enhanced graphical control panel with color LCD display
CT/VT Configuration	F8F: 8 CT / 4 VT inputs; H6C and M8F additional CT input modules
Digital I/O	P6D and 06D auxiliary input/output modules
Communication Interface	RS485, redundant Ethernet 100Base-FX / 10/100Base-T
Protocol Support	IEC 61850, Modbus RTU/TCP, DNP 3.0, IEEE 1588 PTP
Recording Function	Oscillography up to 64 samples per cycle; SOE record up to 1024 events

Firmware, Network and I/O Architecture

The GE Multilin T35 uses a modular hardware architecture with configurable CT/VT acquisition modules, digital input/output cards, and communication interfaces. The UR platform supports deterministic substation communication through IEC 61850 GOOSE messaging, client/server services, and redundant Ethernet network configurations including PRP, RSTP, and HSR.

The relay firmware executes transformer protection algorithms including percentage differential protection (87T) with harmonic restraint, instantaneous differential protection (87P), restricted earth fault protection (87G), and transformer overexcitation supervision (24). The modular I/O structure allows channel expansion for multi-winding transformer applications and breaker current monitoring.

Frequently Asked Questions

Q: Does the T35 support hot-swap replacement of installed modules?
A: Module replacement procedures must follow GE Multilin UR maintenance instructions. Hot-swap operation should not be assumed unless specifically supported by the installed hardware revision and firmware configuration.

Q: What communication interfaces are available on the T35-N03-HCH-F8F-H6C-M8F-P6D-06D-WXX?
A: The relay provides RS485 communication and redundant Ethernet interfaces supporting IEC 61850, Modbus RTU/TCP, DNP 3.0, and IEEE 1588 PTP synchronization.

Q: How are transformer current inputs configured on this model?
A: The specified configuration includes F8F, H6C, and M8F CT/VT modules for multiple current measurement channels used for transformer differential and protection functions.

Field Installation Guidelines

Install the relay in a compatible 19-inch rack enclosure with adequate mechanical support and grounding provisions. Verify CT polarity, phase identification, and secondary wiring before energizing protection inputs.

Use shielded communication cables for RS485 and Ethernet connections where required by the installation environment. Terminate cable shields according to site grounding practices to reduce electromagnetic interference.

Separate low-level communication wiring from high-current AC/DC power conductors. Confirm that CT circuits remain closed during maintenance operations and that all digital input/output wiring matches the configured protection logic.

Verify firmware compatibility, module recognition, and protection settings after installation. Perform secondary injection testing before placing the transformer protection system into service.

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