Film Capacitors – Power Factor Correction

B25675C*

PhaseCap Energy Plus

MKK

Preliminary data

CAP FILM ES PFC PM

2021-06-24

Please read Cautions and warnings and

Page 14 of 17

Important notes at the end of this document.

Overpressure disconnector

To ensure full functionality of an overpressure disconnector, the following must be observed:

1. The elastic elements must not be hindered, i.e.



Connecting lines must be flexible leads (cables).



There must be sufficient space (min. 12 mm) for expansion above the connections. This will

enable a longitudinal extension of the can to secure the overpressure disconnector work.



Folding beads must not be retained by clamps.

2. The maximum allowed fault current of 10000 A in accordance with UL 810 standard must be

assured by the application.

3. Stress parameters of the capacitor must be within the IEC60831 specification.

Overcurrent and short circuit protection



Use HRC fuses or MCCBs for short circuit protection. Short circuit protection and connecting

cables should be selected so that 1.5 times the maximum total RMS capacitor current can be

permanently handled.



HRC fuses do not protect a capacitor against overload – they are only for short circuit protection.



The HRC fuse rating should be 1.6 to 1.8 the maximum total RMS capacitor current.



Do not use HRC fuses/Switch Fuse Unit to disconnect capacitors (risk of arcing).



Use thermal magnetic over current relays for overload protection.

Mechanical protection

The capacitor has to be installed in a way that mechanical damages and dents in the aluminum can

are avoided.

Grounding

The threaded bottom stud of the capacitor has to be used for grounding. In case grounding is done

via metal chassis that the capacitor is mounted to, the layer of varnish beneath the washer and nut

should be removed. The maximum tightening torque is 10 Nm for M12 stud.

Maintenance



Check tightness of the connections/terminals periodically.



Take current reading twice a year and compare with nominal current. Use a harmonic analyser or

true effective RMS-meter.



In case of current above the nominal current check your application for modifications.



If a significant increase in the amount of non-linear loads has been detected, then a consultant

has to be called in for a harmonic study.



In case of the presence of harmonics installation of a de-tuned capacitor bank (reactors) must be

considered.



Check the temperature of capacitors directly after operation for a longer period, but make sure

that the capacitors have been switched off. In case of excessive temperature of individual

capacitors, it is recommended to replace these capacitors, as this should be an indication for loss

factor increase, which is a sign for reaching end of life.