GE 745 TRANSFORMER MANAGEMENT RELAY User Manual

5-66 745 Transformer Management Relay GE Power Management
5.6 S4 ELEMENTS 5 SETPOINTS
5
b) FREQUENCY DECAY
UNDERFREQUENCY 1
DELAY: 1.00 s
Range: 0.00 to 600.00 (steps of 0.05)
Enter the time the frequency must remain below the pickup level before the
element operates.
UNDERFREQUENCY 1
BLOCK: Disabled
Range: Disabled / Logc Inpt 1 (2-16) /Virt Inpt 1 (2-16) / Output Rly 1 (2-8) /
SelfTest Rly / Virt Outpt 1 (2-5)
y FREQUENCY DECAY
y
[ENTER] for more
This message indicates the start of the
FREQUENCY DECAY
section. To
continue these setpoints press or press for the next section.
FREQUENCY DECAY
FUNCTION: Disabled
Range: Disabled / Enabled
FREQUENCY DECAY
TARGET: Latched
Range: Self-reset / Latched / None
Select
None
to inhibit the display of the target message when the element
operates. Thus an element whose “target type” is
None
never disables the
LED self-test feature since it cannot generate a displayable target message.
CURRENT SENSING:
Enabled
Range: Disabled / Enabled
MINIMUM OPERATING
CURRENT: 0.20 x CT
Range: 0.20 to 1.00 (steps of 0.01)
Enter the minimum value of Winding 1 phase A current (in units of relay
nominal current) required to allow the frequency decay element to operate.
MINIMUM OPERATING
VOLTAGE: 0.50 x VT
Range: 0.10 to 0.99 (steps of 0.01)
Enter the minimum value of voltage (in units of relay nominal voltage)
required to allow the underfrequency element to operate.
FREQUENCY DECAY
THRESHOLD: 59.50 Hz
Range: 45.00 to 59.99 (steps of 0.01)
Enter the frequency (in Hz) below which the four frequency rate-of-change
levels of the frequency decay element will be allowed to operate.
FREQUENCY DECAY
DELAY: 0.00 s
Range: 0.00 to 600.00 (steps of 0.01)
FREQUENCY DECAY
RATE 1: 0.4 Hz/s
Range: 0.1 to 5.0 (steps of 0.1)
Enter the rate of frequency decay beyond which the rate 1 element operates.
FREQUENCY DECAY
RATE 2: 1.0 Hz/s
Range: 0.1 to 5.0 (steps of 0.1)
Enter the rate of frequency decay beyond which the rate 2 element operates.
FREQUENCY DECAY
RATE 3: 2.0 Hz/s
Range: 0.1 to 5.0 (steps of 0.1)
Enter the rate of frequency decay beyond which the rate 3 element operates.
FREQUENCY DECAY
RATE 4: 4.0 Hz/s
Range: 0.1 to 5.0 (steps of 0.1)
Enter the rate of frequency decay beyond which the rate 4 element operates.
FREQUENCY DECAY
BLOCK: Disabled
Range: Disabled / Logc Inpt 1 (2-16) /Virt Inpt 1 (2-16) / Output Rly 1 (2-8) /
SelfTest Rly / Virt Outpt 1 (2-5)
ENTER
MESSAGE

GE 745 TRANSFORMER MANAGEMENT RELAY Specifications

General

Brand	GE
Model	745 TRANSFORMER MANAGEMENT RELAY
Category	Relays
Language	English