ABB Relion 670 Series RES670, Technical Manual

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• unconditionally on the input
IN
value
• reset the value of the nonvolatile memory to zero
•
BLOCK
: Freeze the integration and block/reset the other outputs
• unconditionally on the signal value
• BLOCK request overrides RESET request
• Monitor and report the conditions of limit transgression
•
overflow if output
ACCTIME
>999999.9 seconds
• alarm if
ACCTIME
> tAlarm
• warning if
ACCTIME
> tWarning
The
ACCTIME
output represents the integrated time in seconds while tOverflow , tAlarm
and tWarning are the time limit parameters in seconds.
tAlarm and tWarning are user settable limits. They are also independent, that is, there is
no check if tAlarm > tWarning .
tAlarm and tWarning are possible to be defined with a resolution of 10 ms, depending on
the level of the defined values for the parameters.
The limit for the overflow supervision is fixed at 999999.9 seconds. The outputs freeze if
an overflow occurs.
15.14.6.1 Operation accuracy
The accuracy of TEIGAPC depends on essentially three factors
• function cycle time
• the pulse length
• the number of pulses, that is, the number of rising and falling flank pairs
In principle, a shorter function cycle time, longer integrated time length or more pulses
may lead to reduced accuracy.
15.14.6.2 Memory storage
The value of the integrated elapsed time is retained in a non-volatile memory.
1MRK 511 365-UUS A
Section 15
Logic
Phasor measurement unit RES670 2.1 ANSI 475
Technical manual