GE 745 TRANSFORMER MANAGEMENT RELAY

GE Power Management 745 Transformer Management Relay 6-1
6 ACTUAL VALUES 6.1 OVERVIEW
6
6 ACTUAL VALUES 6.1 OVERVIEW 6.1.1 DESCRIPTION
Measured values, event records and product information are actual values. Actual values may be accessed via
any of the following methods:
• Front panel, using the keys and display.
• Front program port, and a portable computer running the 745PC software supplied with the relay.
• Rear RS485/RS422 COM 1 port or RS485 COM 2 port with any system running user written software.
Any of these methods can be used to view the same information. A computer, however, makes viewing much
more convenient, since more than one piece of information can be viewed at the same time.
Actual value messages are organized into logical groups, or pages, for easy reference. All actual value mes-
sages are illustrated and described in blocks throughout this chapter. A reference of all messages is also pro-
vided at the end of the chapter. All values shown in these message illustrations assume that no inputs (besides
control power) are connected to the 745.
Some messages appear on the following pages with a gray background. This indicates that the message may
not appear depending upon the configuration of the relay (as selected by setpoints) or the options installed in
the relay during manufacture. For example, no display associated with Winding 3 will ever appear if the relay is
not configured for three-winding operation.
6.1.2 ACTUAL VALUES ORGANIZATION
yy ACTUAL VALUES
yy A1 STATUS
• Current Date and Time
• Logic Inputs
• Virtual Inputs
• Output Relays
• Virtual Outputs
• Self-Test Errors
yy ACTUAL VALUES
yy A2 METERING
• Currents (Phase, Neutral, Ground, Positive, Negative, and Zero
Sequence, Differential, Restraint, Ground Differential)
• Harmonic Content (2nd to 21st, THD, Harmonic Derating)
• System Frequency and Frequency Decay Rate
• Tap Changer
• Voltage and Volts-Per-Hertz
• Current Demand
• Ambient Temperature
• Loss of Life
• Analog Input
•Power
•Energy
yy ACTUAL VALUES
yy A3 EVENT RECORDER
• 128 events
yy ACTUAL VALUES
yy A4 PRODUCT INFO
• Technical Support
• Revision Codes
• Calibration Dates