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Datasheet: B25671A4307A375 (EPCOS)

PoleCap (MKK)

 

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EPCOS
PoleCap Capacitors for Power Factor Correction (Outdoor usage)
MKK-Series
Series/Type: B25671
Ordering code:
B25671A4307A375
Date: June
2005
Version: 1
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Identification/Classification 1:
(header 1)
Power Capacitors
Identification/Classification 2:
(header 2)
Power Factor Correction
Ordering code:
B25671A4307A375
Series/Type: MKK440-D-18.8-P
Preliminary data (optional):
(if necessary)
Department:
FK PFC R&D
Date: 2005-06-03
EPCOS AG 2005. Reproduction, publication and dissemination of this data sheet, enclosures hereto and the information contained therein without EPCOS'
prior express consent is prohibited.
Power Capacitors
B25671A4307A375
Power Factor Correction MKK440-D-18.8-P

Construction











Dielectric: Polypropylene film
Gas-impregnated / dry type
Concentric winding
Wave cut
Extruded round aluminum can with stud
Provided with ceramic discharge module
Triple safety system
Features
Three phase, delta connected
Self-healing technology
Naturally air cooled (or forced air cooling)
Outdoor mounting
Ambient
Highest insulation strength for outdoor
applications (to IEC 60831, 15kV)
Terminal cover, cable gland and connection
cable made of material resistant to weather,
UV radiation and aging.
Cable UV-resistant and flame retardant
Housing of pure aluminium (corrosion-free operation)
Double housing of terminals for protection against
hazardous parts, ingress of solid foreign bodies,
dust and harmful effects of water


Technical data and specifications


Characteristics
Rated capacitance C
R
3 x 103 F
Tolerance
-5 / +10%
Connection D
(Delta)
Rated voltage V
R
440
VAC
Rated frequency f
R
50 Hz
60 Hz
Output
18.8 kvar
22.6 kvar
Rated current I
R
25 A
30 A
tan (dielectric)
0.2 W / kvar

FK PFC R&D
2005-06-03
Please read the important notes,
Page
2 of 8
cautions and warnings.
Power Capacitors
B25671A4307A375
Power Factor Correction MKK440-D-18.8-P
Maximum ratings
U
max
(up to 8 h daily) 480 VAC
U
max
(up to 1 min)
570 VAC
I
max
1.3 x I
R
(A)
I
S
200 x I
R
(A)
Test data
U
TT
950 VAC / 50 Hz during 10 s
U
TC
3,000 VAC / 50 Hz during 10 s
tan (50 Hz)
0.6 W / kvar
Climatic category / -40/D
T
min
(-)
40 C
T
max
(+)
55 C
Humidity
av. rel. < 95%
Maximum altitude
4,000 m
Dimensional drawing
Label design
Mean life expectancy
t
LD
Up to 100,000 hours
Max. 5000 switchings per year acc. to IEC 60831
Design data
Dimensions (
x l)
145 x 253 mm
Weight approx
2.7 kg
Impregnation
Dry, inert gas
Fixing
Threaded bolt M12
Max. torque (Al can stud) 10 Nm
Mounting position

Any mounting position
possible. See
"Maintenance and
Installation Manual" for
further details.




FK PFC R&D
2005-06-03
Please read the important notes,
Page
3 of 8
cautions and warnings.
Power Capacitors
B25671A4307A375
Power Factor Correction MKK440-D-18.8-P


Terminals
Enclosure
IP54 internally protected
Connection cables
Length 2 m (UV resistant & water proof)
Cable cross section / Cable gland 10 mm
2
/ PG 21
Maximum terminal current
50 A
Creepage distance
12.7 mm
Clearance
9.6 mm

Safety
Mechanical safety
Overpressure disconnector
Max. short circuit current
(AFC: 10 kA)
Discharge resistor time
1 min (50 V)

Reference standards
IEC 60831-1/2

FK PFC R&D
2005-06-03
Please read the important notes,
Page
4 of 8
cautions and warnings.
Power Capacitors
B25671A4307A375
Power Factor Correction MKK440-D-18.8-P
Cautions, Installation and Maintenance
In case of dents of more than 2 mm depth or any other mechanical damage, capacitors must not
be used at all.
To ensure the full functionality of the overpressure disconnector, elastic elements must not be
hindered and a minimum space of 5 cm has to be kept above each capacitor.
Do not handle the capacitor before it is discharged to max. 10% of rated voltage.
Resonance cases must be avoided by appropriate application design in any case.
Handle capacitors carefully, because they may still be charged even after disconnection due to
faulty discharging devices.
Protect the capacitor properly agains overcurrent and short circuit.
When the red stripe of the visual fault indicator can be seen, the capacitor has to be replaced in
any case.
Failure to follow cautions may result, worst case, in premature failures, bursting and fire.

Discharging
Capacitors must be discharged to a maximum of 10% of rated voltage before they are switched in
again. This prevents an electric impulse discharge in the application, influences the capacitor's
service life and protects against electric shock. The capacitor must be discharged to 75 V or less
within 3 minutes. There must be not any switch, fuse or any other disconnecting device in the circuit
between the power capacitor and the discharging device. PoleCap capacitors have a pre-mounted
ceramic discharge module; alternatively discharge reactors are available from EPCOS. Discharge and
short circuit capacitor before handling!
Service life expectancy
Electrical components do not have an unlimited service life expectancy; this applies to self-healing
capacitors too. The maximum service life expectancy may vary depending on the application the
capacitor is used in.
Safety
Ensure good, effective grounding for capacitor enclosures.
Provide means of disconnecting and insulating a faulty component/bank.
Handle capacitors carefully, because they may still be charged even after disconnection due to
faulty discharging devices.
The terminals of capacitors, connected bus bars and cables as well as other devices may also be
energized.
Follow good engineering practice.

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 rated 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 times rated capacitor current.

FK PFC R&D
2005-06-03
Please read the important notes,
Page
5 of 8
cautions and warnings.
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