FI820F 3BDH000031R1 ABB controller module

FI820F 3BDH000031R1 ABB controller module

Technical data of product parameters

The basic setting g defines the pick-up setting of FI820F 3BDH000031R1 the differential
protection for internal faults.
The lowest possible value should be chosen for “g” (high sensitivity) to enable it to detect transformer earth faults and interturn
faults in addition to phase faults.
The setting of “g” must not be too low, however, to avoid the
danger of false tripping due to:

c.t. errors

the maximum off-load transformer current at the maximum
short-time system voltage

tap-changer range.
The off-load current of a modern power transformer is very low
and usually lies between 0.3 and 0.5 % of rated current at rated
voltage. During short-time voltage peaks, e.g. following load
shedding, the off-load current can reach as much as 10 % or
more. FI820F 3BDH000031R1
The tap-changer voltage range is usually between ±5 % and
±10 %, but ranges of ±20 % and more do occur. Its influence has
to be taken into account regardless of whether the tap-changer
is manually operated or controlled by a voltage regulator.All three of these influences cause a differential current, which
flows during normal system conditions. The setting for “g” must
be chosen above the level of this differential current. A typical
setting is g = 0.3 IN (i.e. 30 % IN).
Pick-up ratio v
The pick-up ratio “v” is decisive for the stability of the protection
during external phase and earth faults, i.e. in the presence of
high through-fault currents. FI820F 3BDH000031R1
The value of “v” defines the ratio of the operating current to restraint current. The setting should be such that when operating
under load conditions, weak faults causing only a low differential
current can still be detected, but also there is no risk of maloperation during through-faults. A typical setting is v = 0.5The restraint current b defines the point at which the characteristic is switched.
The sloped section of the characteristic ensures that the relay
remains stable during through-faults with c.t. saturation.FI820F 3BDH000031R

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