B25671A4207A375 Datasheet, PDF (7/8 Pages) EPCOS – PoleCap Capacitors for Power Factor Correction (Outdoor usage)

Film Capacitors – Power Factor Correction
PoleCap capacitor
B25671A4207A375
MKK440-D-12.5-P
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. The
combination of the natural cooling by the wind and the single-housing of the capacitor helps 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 50 V or less.
 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 and
ground.
Note
For detailed information about PFC capacitors and cautions, refer to the latest version of EPCOS PFC
Product Profile.
FK PC PM PFC
Please read Cautions and warnings and
Important notes at the end of this document.
Page 7 of 8
June 2009