S4 Elements
745
Transformer Management Relay
Setpoints
http://www.GEindustrial.com/multilin
5–69
GE Multilin
• MINIMUM OPERATING CURRENT: 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: Enter the minimum value of voltage (in
units of relay nominal voltage) required to allow the underfrequency element to
operate.
• FREQUENCY DECAY THRESHOLD: 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 RATE 1(4): Enter the rate of frequency decay beyond
which the corresponding element operates.
FIGURE 5–30: Frequency Decay Scheme Logic
MESSAGE
FREQUENCY DECAY
RATE 4: 4.0 Hz/s
Range: 0.1 to 5.0 Hz/s in steps of 0.1
MESSAGE
FREQUENCY DECAY
BLOCK: Disabled
Range: Logc Inpt 1 to 16, Virt Inpt 1 to
16, Output Rly 2 to 8, SelfTest
Rly, Vir Outpt 1 to 5, Disabled
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