ABB UAD149A0011 3BHE014135R0011 After sales service is provided for the control card of the power supply device

Description

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The characteristics of a capacitor, given on its nameplate, are:
• rated voltage Ur
, which the capacitor must withstand indefinitely;
• rated frequency f
r
(usually equal to that of the network);
• rated power Qc
, generally expressed in kvar (reactive power of the capacitor
bank).
From this data it is possible to find the size characteristics of the capacitors by
using the following formulae (5):
In a three-phase system, to supply the same reactive power, the star connection requires a capacitor with a capacitance three times higher than the
delta-connected capacitor.
In addition, the capacitor with the star connection results to be subjected to
a voltage √3 lower and flows through by a current √3 higher than a capacitor
inserted and delta connected.
Capacitors are generally supplied with connected discharge resistance, calculated so as to reduce the residual voltage at the terminals to 75 V in 3 minutes,
as stated in the reference Standard.
3.2 Power factor correction method
Single PFC
Single or individual power factor correction is carried out by connecting a
capacitor of the correct value directly to the terminals of the device which
absorbs reactive power.
Installation is simple and economical: capacitors and load can use the same
overload and short-circuit protection, and are connected and disconnected
simultaneously.
The adjustment of cosϕ is systematic and automatic with benefit not only to
the energy distribution authority, but also to the whole internal distribution
system of the user.
This type of power factor correction is advisable in the case of large users with
constant load and power factor and long connection times.
Individual PFC is usually applied to motors and fluorescent lamps. The capacitor
units or small lighting capacitors are connected directly to loads.