Description
Adept at safeguarding and managing transformer systems, GE Multilin's 745-W2-P5-G5-HI-A-L-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-A-L-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 |
| Weight | 4.8kg |
| 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-A-L-R-E-H |
| Ground Current Relay Input | 5 A |
| Display Type | 40 character LCD |
Current Transformer Inputs
The 745 has eight or eleven channels for AC current inputs, each with an isolating transformer and an automatic shorting mechanism that acts when the relay is withdrawn from its case. There are no internal ground connections on the current inputs. Current transformers with 1 to 50000 A primaries may be used.
The SR-745 Relay has inputs for either two or three transformer windings (specified at the time of ordering) and for two ground current inputs, G1/2 and G2/3. Refer to the wiring diagrams below for details. Upon transformer type selection, the ground inputs are associated to one or another winding under the following conditions:
1. The ground input settings will be shown in the winding configuration for the transformer type selections associated with a ground input.
2. When a 2-winding transformer is selected, ground inputs are enabled, on both, and are pre-assigned. G1/2 is assigned to winding 1, and G2/3 is assigned to winding 2.
3. When a 3-winding transformer is selected, both ground inputs are enabled, and are associated with the windings via the following rules (see table 3-2):
The 50G function is enabled for all connection scenarios (ie: delta and wye).
Flexibility is provided to the user in the case of a 3-winding transformer, so the user can assign G1/2 and G2/3 Ground inputs to any two of the three available windings.
4. Robustness, built into the relay, will not allow the user to assign a ground input to more than one winding. In the EnerVista 745 software, a flag informs the user with the text: "Ground CT Input 'G#/#' has already been selected for another winding". On the relay firmware, "Input Function is Already Assigned" text is displayed.
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