ABB RELION REX640 Technical Manual page 267

1MRS759142 F
When using this function for energy measurement,
that is, real, active or apparent energy and the count value is divided by
ratio to calculate the scaled value. The prefix for unit of Impulse ratio is defined by
setting
The scaled value is available at SCALED_VALUE in the Monitored data view. This
output is updated cyclically and sent to the station HMI over various communication
protocols depending on
corresponds to the start of the function operation in the protection relay.
The activation of RESET resets SCALED_VALUE to zero.
Binary output VALUE_READ activates for a fixed 200 ms each time the reporting
timer completes its cycle.
It is also possible to update SCALED_VALUE before completion of
and make it available for communication by providing a pulse at READ_VALUE input.
The pulse width should be greater than 1 s. Besides updating SCALED_VALUE, the
READ_VALUE activation also activates output VALUE_READ for 200 ms.
Activation of FREEZE_COUNT input immediately updates SCALED_VALUE output with
a pulse at VALUE_READ output.
Output COUNT_SAT activates when either SCALED_VALUE or COUNT_VALUE exceeds
the count range and it is not possible to count further.
Figure 149
REX640
Technical Manual
Impulse ratio prefix .
The energy meter defines the impulse ratio (also known as meter
constant), that is, it indicates the number of pulses the meter generated
per kWh (or MWh).
used.
For example, if the impulse ratio is 100 impulses / MWh, set
Impulse ratio prefix as Mega.
as 100 and
If the impulse ratio is 800 impulses / KWh, set
Impulse ratio prefix as Kilo.
Reporting interval setting. The start of Reporting interval
Pulse quantity , Impulse ratio or Impulse ratio prefix is changed in
If
between, SCALED_VALUE is updated immediately based on the new
setting.
Figure 150
and explain PCGAPC operation.
Unit selection is set accordingly,
Impulse ratio must be set based on the energy meter
Basic functions
Impulse
Impulse ratio
Impulse ratio as 800 and
Reporting interval
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