ABB BCU-12 3AUA000010430 spare parts

ABB BCU-12 3AUA000010430 spare parts

Technical data of product parameters

As can be seen from Fig.BCU-12 3AUA000010430, the relay setting for a zone of
protection of 95 % is 5 % of Umax. The scheme detects E/F’s on
the generator stator winding, the cables to the step-up transformer and the delta-connected windings of the step-up transformer.
The capacitances between primary and secondary BCU-12 3AUA000010430 of the step-up
transformer conduct currents emanating from E/F’s on the HV
side to the LV side and can cause false tripping of the stator E/F
protection. The capacitive coupling of E/F currents on the HV
side takes place regardless of whether the HV star-point is
grounded or not. The capacitance C12 between HV and LV
windings of the step-up transformer and the capacitance C of the
generator circuit form a potential divider, which determines the
potential of the generator star-point (see Fig. 3.5.10.3a). The
value of the capacitance C is usually too low to definitely hold
the star-point below the pick-up setting of the protection. For this
reason, the generator star-point is grounded via a resistor RE
(see Fig. 3.5.10.4), which ensures that the potential of the starpoint remains below the setting of the protection for an E/F on BCU-12 3AUA000010430
the HV power system. Correspondingly, the value of the resistor
RE is chosen such that for a given C12 and an E/F at the HV
terminals of the step-up transformer, the off-set of the generator
star-point does not reach the pick-up setting of the 95 % E/F
protection.If a generator circuit-breaker is installed between the generator
and the step-up transformer, a second E/F protection scheme is
required for the zone between the step-up transformer and the
unit transformer. The second scheme is connected to the broken
delta secondary windings of three v.t’s. This scheme must also
remain stable for E/F’s on the HV system and during ferroresonance phenomena and for this reason there is a resistor across BCU-12 3AUA000010430
the broken delta as well. Frequently, the E/F protection is only
required to protect the cables and bar conductors, because the
transformers are protected by differential schemes and Buchholz
relays. In this case, the E/F protection setting is determined by
the voltage off-set for an E/F at the lowest load voltage. A typical
setting for reliable E/F detection in an ungrounded system is

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