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CHAPTER 5: SETPOINTS
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
FREQUENCY DECAY
MESSAGE
RATE 2: 1.0 Hz/s
FREQUENCY DECAY
MESSAGE
RATE 3: 2.0 Hz/s
FREQUENCY DECAY
MESSAGE
RATE 4: 4.0 Hz/s
FREQUENCY DECAY
MESSAGE
BLOCK: Disabled
•
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 5–31: Frequency decay scheme logic
S4 ELEMENTS
Range:
0.1 to 5.0 Hz/s in steps of 0.1
Range:
0.1 to 5.0 Hz/s in steps of 0.1
Range:
0.1 to 5.0 Hz/s in steps of 0.1
Range:
Logc Inpt 1 to 16, Virt Inpt 1 to
16, Output Rly 2 to 8, SelfTest
Rly, Vir Outpt 1 to 5, Disabled
5–81
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