GE 745 TRANSFORMER MANAGEMENT RELAY

GE Power Management 745 Transformer Management Relay 5-1
5 SETPOINTS 5.1 OVERVIEW
5
5 SETPOINTS 5.1 OVERVIEW 5.1.1 SETPOINT GROUPS
The 745 relay has a considerable number of programmable settings (setpoints) which makes it extremely flex-
ible. The setpoints have been grouped into a number of pages as shown below. If using the 745PC software
and not connected to a relay, you may have to select the
File > Properties
menu item and set the correct
options for your relay.
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S1 745 SETUP
• Passcode
• Preferences (beeper, flash and default messages)
• Communications (address, COM1 and COM2 parity / hardware type / baud rate)
• Resetting
•Clock
• Default Messages
• Scratch Pad
• Installation
• Upgrade options
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S2 SYSTEM SETUP
• Transformer
• Windings 1, 2, and 3
• Onload Tap Changer
•Harmonics
• FlexCurves
• Voltage Input
• Ambient Temperature
• Analog Input
• Demand Metering
• Analog Outputs
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S3 LOGIC INPUTS
• Logic Inputs 1 to 16
• Virtual Inputs 1 to 16
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S4 ELEMENTS
• Setpoint Group (active group and edit group)
• Differential (percent differential; harmonic, energization, & 5
th
harmonic inhibits)
• Instantaneous Differential
• Phase Overcurrent (time and instantaneous for all windings)
• Neutral Overcurrent (time and instantaneous for all windings)
• Ground Overcurrent (time and instantaneous for all WYE windings)
• Restricted Ground Fault (time and instantaneous for all windings)
• Negative Sequence (time and instantaneous for all windings)
• Frequency (underfrequency, frequency decay, and overfrequency)
• Overexcitation (5
th
harmonic level and volts-per-hertz)
• Harmonics (for all windings)
• Insulation aging
• Analog Input
• Current Demand (for all windings)
• Transformer Overload
• Tap changer failure
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S5 OUTPUTS
•Output Relays
• Trace Memory Triggering
• Virtual Outputs
•Timers
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S6 TESTING
• Output Relays (Forcing)
• Analog Outputs (Forcing)
• Simulation
• Factory Service