Power Capacitors

B25671A5197A375

Power Factor Correction

MKK525-D-16.7-P

Clearing distance for overpressure disconnector

Above each capacitor, a minimum space of 5 cm has to be kept. This will allow the visual control to

work and enable a longitudinal extension of the can to secure the over-pressure disconnector work.

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.

Choosing the best spot for mounting

Especially in regions with long periods of sunshine and high temperatures, the PoleCap should be

installed in such a way that it is located in the shadow of the pole for most of the daylight. In addition

to the natural cooling by the wind in combination with the single-housing of the capacitor, this will help

to keep the hot spot temperature at the lowest level possible.

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 discharge resistors/reactors and in case of doubt, check their function:

(1) power the capacitor up and down.

(2) After 60 seconds the voltage between the terminals must decline to less than 50 V.

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.

Storage and operating conditions

Do not use or store capacitors in corrosive atmosphere, especially where chloride gas, sulfide gas,

acid, alkali, salt or the like are present. In dusty environments regular maintenance and cleaning

especially of the terminals is required to avoid conductive path between phases and/or phases

Note

For detailed information about PFC capacitors and cautions, refer to the latest version of EPCOS PFC

Product Profile.

FK PFC R&D

2005-06-03

Please read the important notes,

Page

7 of 8

cautions and warnings.