GE 745 Instruction Manual page 180

S4 ELEMENTS
5.6.11.2 Fifth Harmonic Level

5th HARMONIC [
LEVEL
5–84
This section contains the settings to configure the overexcitation monitoring elements.
Included are a 5th harmonic level, and two volts-per-hertz elements, each with a pickup
level and a time delay.
PATH: SETPOINTS S4 ELEMENTS


] 5th HARMONIC LEVEL
FUNCTION: Disabled
5th HARMONIC LEVEL
MESSAGE
RLYS (1-8): --------
5th HARMONIC LEVEL
MESSAGE
TARGET: Self-Reset
MINIMUM OPERATING
MESSAGE
CURRENT: 0.10 x CT
5th HARMONIC LEVEL
MESSAGE
PICKUP: 10.0% fo
5th HARMONIC LEVEL
MESSAGE
DELAY: 10 s
5th HARMONIC LEVEL
MESSAGE
BLOCK: Disabled
• MINIMUM OPERATING CURRENT: Enter the minimum value of current (in units of relay
nominal current) required to allow the 5th harmonic level element to operate.
• 5TH HARMONIC LEVEL PICKUP: Enter the 5th harmonic current (in %ƒ
the 5th harmonic level element will pickup and start the delay timer.
• 5TH HARMONIC LEVEL DELAY: Enter the time that the 5th harmonic current must
remain above the pickup level before the element operates.
OVEREXCITATION

FIGURE 5–33: 5th harmonic level scheme logic
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS
5th HARMONIC LEVEL

Range: Enabled, Disabled
Range: 1 to 8
Range: Self-Reset, Latched, None
Range: 0.03 to 1.00 x CT in steps of
0.01
Range: 0.1 to 99.9% f in steps of 0.1
0
Range: 0 to 60000 s in steps of 1
Range: Logc Inpt 1 to 16, Virt Inpt 1 to
16, Output Rly 2 to 8, SelfTest
Rly, Vir Outpt 1 to 5, Disabled
) above which
0