GE 745 - 5.7.6 Trace Memory

CHAPTER 5: SETPOINTS S5 OUTPUTS
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 5–105
FIGURE 5–50: Self-test relays scheme logic
5.7.6 Trace Memory
PATH: SETPOINTS  S5 OUTPUTS  TRACE MEMORY
Trace memory is the oscillography feature of the 745. All system inputs are synchronously
digitized at a sampling rate of 64 times per power cycle. Upon occurrence of a user-
defined trigger condition, 32 cycles of oscillography waveforms are captured into trace
memory. The trigger condition is defined by a FlexLogic™ equation, and the number of
pre-trigger cycles of data captured is programmable.
This section contains the settings (including the FlexLogic™ equation) to configure trace
memory triggering.
• NO. OF PRE-TRIGGER CYCLES: Enter the number of cycles of data, of the 32 cycles of
waveform data to be captured, that are to be pre-trigger information.
 TRACE MEMORY [] NO. OF PRE-TRIGGER
CYCLES: 12 cycles
Range: 1 to 31 in steps of 1
MESSAGE
TRACE TRIG FLEXLOGIC
01: Any Element PKP
Range: any FlexLogic™ input or gate
↓
MESSAGE
TRACE TRIG FLEXLOGIC
10: END
Range: any FlexLogic™ input or gate