Description
Adept at safeguarding and managing transformer systems, GE Multilin's 745-W2-P5-G5-HI-R-E-H Transformer Protection Relay extends transformer life expectancy and optimizes transformer performance. This unit is the high control power version of the 745, accepting a control power input of 90 to 300 V DC; 70 to 265 V AC. The relay offers transformer systems a number of practical features, including overexcitation blocking, overfrequency/underfrequency protection, restricted ground fault protection, and system overload protection. The relay can monitor and efficiently respond to shifting system variables like temperature or current. Boasting sixteen logic inputs and an expansive array of ports located at the rear of the terminal, the 745-W2-P5-G5-HI-R-E-H is highly configurable and can act as a stand-alone unit or a component in a larger array.
Specifications
| Operating Environment Humidity | up to 90% non-condensing |
| Voltage Relay Input | 60 to 120 V |
| Relay Dimensions | 9"H, 7 ⅛"D, 7"W |
| Overload Withstand | 1 second at 80 times rated current, continuous at 3 times rated current |
| Model Number | 745-W2-P5-G5-HI-R-E-H |
| Ground Current Relay Input | 5 A |
| Display Type | 40 character LCD |
The relay provides a variety of adaptive relaying features
Adaptive harmonic restraint which addresses the problem of false tripping during inrush
Adaptive time overcurrent elements which will adjust their pickup settings based on the calculated transformer capability when supplying load currents with high harmonic content
Multiple setpoint groups which allow the user to enter and dynamically select from up to four groups of relay settings to address the protection requirements of different power system configurations
Dynamic CT ratio mismatch correction which monitors the on-load tap position and automatically corrects for CT ratio mismatch
FlexLogic™ which allows PLC style equations based on logic inputs and protection elements to be assigned to any of the 745 outputs.
The 745 also includes a powerful testing and simulation feature. This allows the protection engineer the ability to test the relay operation based on captured or computer generated waveform data which can be converted to a digitized format and downloaded into the 745's simulation buffer for "playback". A waveform capture function that records waveform data for fault, inrush, or alarm conditions is also provided. The auto-configuration function eliminates the need for any special CT connections by having all CTs connected in wye.
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