S4 Elements
745
Transformer Management Relay
Se
tpoints
http://www.GEindustrial.com/multilin
5–72
GE Multilin
FIGURE 5–32: 5th Harmonic Level Scheme Logic
c) Volts-Per-Hertz
PATH: SETPOINTS
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S4 ELEMENTS
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OVEREXCITATION
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VOLTS PER HERTZ 1(2)
The Volts Per Hertz element uses the ratio of the actual measured voltage at the
voltage terminal and the measured system frequency. For example, a measured
phases-to-phase voltage of 120 volts at 60 Hz, results in a ratio of 2 V/Hz. For
115% overload, the setting of the V/Hz minimum pickup would be 2.3 V/Hz.
The element has a linear reset characteristic. The reset time can be programmed to
match the cooling characteristic of the protected equipment. The element will fully
reset after the
VOLTS-PER-HERTZ RESET
value. The V/Hz function can be used as an
instantaneous element with no intentional delay, as a definite time element, or as
an inverse timed element.
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VOLTS PER
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HERTZ 1
VOLTS-PER-HERTZ 1
FUNCTION: Disabled
Range: Enabled, Disabled
MESSAGE
VOLTS-PER-HERTZ 1
TARGET: Self-Reset
Range: Self-Reset, Latched, None
MESSAGE
MINIMUM OPERATING
VOLTAGE: 0.10 x VT
Range: 0.10 to 0.99 x VT in steps of
0.01
MESSAGE
VOLTS-PER-HERTZ 1
PICKUP: 2.36 V/Hz
Range: 1.00 to 4.00 V/Hz in steps of
0.01
MESSAGE
VOLTS-PER-HERTZ 1
SHAPE: Definite Time
Range: Definite Time, Inv Curve 1, Inv
Curve 2, Inv Curve 3
MESSAGE
VOLTS-PER-HERTZ 1
DELAY:
2.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
VOLTS-PER-HERTZ 1
RESET:
0.0 s
Range: 0.0 to 6000.0 s in steps of 0.1
MESSAGE
VOLTS-PER-HERTZ 1
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
Summary of Contents for Multilin 745
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