ABB UAC318AE After sales service is provided for the control card of the power supply device

Description

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Level A circuit-breakers (LV side of transformer)
• trafo I
r
(909 A) is the current that flows through the transformer circuitbreakers;
• busbar I
b (2727 A) is the maximum current that the transformers can
supply;
• trafo feeder I
k
(42.8 kA) is the value of the short-circuit current to consider for the
choice of the breaking capacity of each of the transformer circuit-breakers;
• T7S1000 or X1N1000 is the size of the transformer circuit-breaker;
• In (1000 A) is the rated current of the transformer circuit-breaker (electronic
release chosen by the user);
• the minimum value 0.91 indicate the minimum settings of the L function of
the electronic releases for CBs T7S1000 and X1N1000.
Level B circuit-breakers (outgoing feeder)
• busbar I
k
(64.2 kA) is the short-circuit current due to the contribution of all
three transformers;
• corresponding to 63 A, read circuit-breaker B1 Tmax XT1H160;
• corresponding to 400 A, read circuit-breaker B2 Tmax T5H400;
• corresponding to 800 A, read circuit-breaker B3 Tmax T6H800 or
Emax X1N800.
The choice made does not take into account discrimination/back-up
requirements. Refer to the relevant chapters for selections appropriate to the
various cases.

In alternating current circuits, the current absorbed by the user can be represented by two components:
– the active component IR, in phase with the supply voltage, is directly correlated to the output (and therefore to the part of electrical energy transformed
into energy of a different type, usually electrical with different characteristics,
mechanical, light and/or thermal);
– the reactive component IQ, in quadrature to the voltage, is used to produce the
flow necessary for the conversion of powers through the electric or magnetic
field. Without this, there could be no flow of power, such as in the core of a
transformer or in the air gap of a motor.
In the most common case, in the presence of ohmic-inductive type loads, the
total current (I) lags in comparison with the active component IR.
In an electrical installation, it is necessary to generate and transmit, other than the
active power P, a certain reactive power Q, which is essential for the conversion
of electrical energy, but not available to the user. The complex of the power
generated and transmitted constitutes the apparent power S.