Version Changes
Release: 2014-03-20
No changes.
Software
OUTP
Bug fixing:
●
States of output relays are now stored after
power off/on cycle.
LED
Bug fixing:
●
LED states are now stored after power off/on
cycle.
REF_x
Bug fixing:
●
Due to the implementation of enhanced
algorithms for the suppression of noise
components in the samples, the measuring values
of the ground differential protection are now
calculated with higher accuracy and provide a
better implementation of the tripping
characteristic.
●
Differential and restraining currents are now
calculated correctly if currents of end b or c have
to be taken into account, as is the case for the
protection of autotransformers.
●
In the operating modes with current stabilization
(“Low imped. / sum(IP)” and “Low imped. /
IP,max”), the correct measuring values of
differential and restraining currents are displayed
now. The display issue was merely due to a
scaling problem, whereas the REF_x protection
calculations have been correct at all times.
●
The phase reversal function for end d has now
been corrected.
P634
‑310
‑409/410
‑650-702
Release: 2014-05-06
Hardware
No changes.
Diagram
No changes.
Software
DIFF
Bug fixing:
●
The operate value of the overfluxing restraint of
differential protection (ratio of the fifth harmonic
component to the fundamental wave of the
differential current, (072 160) DIFF: Ov.
I(5f0)/I(f0) PSx) is now implemented correctly.
P634 A5 P634 Version History
A5-32 P634/EN M/R-42-A // P634‑311‑653
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