Operation Accuracy - ABB RES670 Technical Manual

1MRK 511 408-UUS A
16.10.6.1
16.10.6.2
Phasor measurement unit RES670 2.2 ANSI
Technical manual
• the amount of time to be added is defined by a setting tAddToTime
• time is added through activation of input ADDTIME or from LHMI or with
IEC 61850 command
• BLOCK: Freeze the accumulation and block/reset the other outputs
• independent of the input IN value
• BLOCK request overrides RESETrequest
• Monitor and report the conditions of limit transgression
• overflow if output ACC_HOUR > 99 999.9 hours
• alarm if output ACC_HOUR > tAlarm
• warning if output ACC_HOUR > tWarning
The ACC_HOURoutput represents the accumulated time in hours and the ACC_DAY
output represents the accumulated time in days.
tAlarm and tWarning are user settable time limit parameters in hours. They are also
independent of each other, that is, there is no check if tAlarm > tWarning.
tAddToTime is a user settable time parameter in hours.
tAlarm, tWarning and tAddToTime are possible to be defined with a resolution of 0.1
hours (6 minutes).
The limit for the overflow supervision is fixed at 99999.9 hours. The outputs will reset
and the accumulated time will reset and pickup from zero if an overflow occurs.

Operation accuracy

The accuracy of TEILGAPC depends on essentially two factors
• the pulse length
• the number of pulses, that is, the number of rising and falling flank pairs
In principle, more pulses may lead to reduced accuracy.
Memory storage
The value of the accumulated time is retained in a non-volatile memory,
• at every falling edge of the input IN
• at every even 6 minutes, after a rising edge of the input IN
• after a manual addition of time
Section 16
Monitoring
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