CHAPTER 5: SETPOINTS S4 ELEMENTS
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 5–57
• 5th HARMONIC INHIBIT LEVEL: Enter the level of 5th harmonic current above which
the percent differential element will be inhibited from operating.
FIGURE 5–13: 5th harmonic inhibit scheme logic
5.6.4 Instantaneous Differential
PATH: SETPOINTS S4 ELEMENTS INST DIFFERENTIAL
This section contains the settings to configure the (unrestrained) instantaneous differential
element, for protection under high magnitude internal faults.
• INST DIFFERENTIAL PICKUP: Enter the level of differential current (in units of relay
nominal current) above which the instantaneous differential element will pickup and
operate.
INST []
DIFFERENTIAL
INST DIFFERENTIAL
FUNCTION: Enabled
Range: Enabled, Disabled
MESSAGE
INST DIFFERENTIAL
RLYS (1-8): --------
Range: 1 to 8
MESSAGE
INST DIFFERENTIAL
TARGET: Latched
Range: Self-Reset, Latched, None
MESSAGE
INST DIFFERENTIAL
PICKUP: 8.00 x CT
Range: 3.00 to 20.00 × CT in steps of
0.01
MESSAGE
INST DIFFERENTIAL
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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