The GE Multilin T35, also cataloged as the T35 Transformer Protection Relay, operates as a dedicated hardware component for three-phase transformer protection within electrical substation and transmission loops. The system calculates vector parameters across installations with up to six windings or restraint connections, executing localized differential, overcurrent, and earth fault monitoring logic to safeguard primary power equipment.
Hardware Specifications
Parameter
Specification
Model
T35
Brand
GE Multilin (General Electric)
Origin
Canada / United States
Weight
Standard UR series horizontal 19-inch rack-mount profile
Dimensions
4U standard chassis envelope configuration
Operating Temp
-40 to +85 deg C
Power Supply
125/250 V AC/DC nominal external source options
Phase CT Inputs
Three 1 A / 5 A programmable phase current transformers
Ground CT Input
One 1 A / 5 A programmable ground current transformer
VT Output Links
Four 120 V / 240 V voltage transformer tracking lines
Output Voltage Range
24 VDC to 250 VAC operational envelope
Output Current Max
10 A continuous operational contact rating
Protection Functions
Differential, overcurrent, undervoltage, and earth fault elements
Integrated Metering
Voltage, current, power, frequency, and harmonic parameters
Backplane Bus Communication Velocity and Processing
The protection card utilizes an architecture built around high-density processing components to accelerate internal data transfer delays down to sub-millisecond ranges. By enforcing rigid firmware flash compatibility standards across all plug-in boards, the modular backplane manages large data packet distribution from multiple current transformers without introducing signal distortion. This communication speed allows the dual-core processing engine to resolve complex winding differential matrix equations concurrently, matching the strict timing constraints needed to trip external line breakers during severe short-circuit sequences.
