Film capacitors – Capacitors for Power Factor Correction
WindCap capacitors
Series/Type:
MKK690-D-12.5-11
Ordering code: B25668A6836A375
Date:
Version:
July 2007
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Film capacitors
– Capacitors for Power Factor Correction
WindCap capacitors
B25668A6836A375
MKK690-D-12.5-11
Preliminary
FK PFC R&D
July 2007
©
EPCOS AG 2007. Reproduction, publication and dissemination of this data sheet, enclosures hereto and the information
contained therein without EPCOS' prior express consent is prohibited.
Film capacitors – Capacitors for Power Factor Correction
WindCap capacitors
Construction
Dielectric: Polypropylene film
Gas-impregnated / dry type
Concentric winding
Wave cut
Extruded round aluminum can with stud
Triple safety system
Features
Three phase, delta connected
Self-healing technology
Naturally air cooled (or forced air cooling)
Indoor mounting
Typical applications
Industrial
Wind turbines
Harmonic filtering for 690/800 V grids
Terminals
SIGUT terminals
Mounting parts
Threaded stud at bottom of can
(max. torque = 10 Nm for M12)
B25668A6836A375
MKK690-D-12.5-11
Dimensional drawing
Technical data and specifications
Characteristics
Rated capacitance C
R
Tolerance
Connection
Rated Voltage
Rated frequency f
R
Output
Rated current I
R
tan
δ
0
(dielectric)
3 · 28 µF
–5 / +10%
D (Delta)
690 V AC
50 Hz
12.5 kvar
10 A
0.2 W / kvar
60 Hz
15 kvar
13 A
FK PFC R&D
Page 2 of 8
July 2007
Film capacitors – Capacitors for Power Factor Correction
WindCap capacitors
B25668A6836A375
MKK690-D-12.5-11
Maximum ratings
V
max
(up to 8 h daily)
V
max
(up to 1 min)
I
max
I
S
760 V AC
900 V AC
1.3 · I
R
(A)
300 · I
R
(A)
Test data
V
TT
V
TC
1,500 V AC / 50 Hz during 10 s
6,000 V AC / 50 Hz during 10 s
Climatic category / -40/D
T
min
T
max
Rel. humidity
Maximum altitude
–40
ºC
+55 ºC
av. < 95%
4,000 m
Mean life expectancy
t
LD
up to 130,000 hours
Max. 5,000 switchings per year to IEC 60831
Design data
Dimensions (∅ × l)
Weight approx
Impregnation
Fixing
Max. torque (Al can stud)
Mounting position
121 × 164 mm
1.4 kg
Dry, inert gas
Threaded bolt M12
10 Nm
Any mounting position
possible. See
“Maintenance and
Installation Manual” for
further details.
FK PFC R&D
Page 3 of 8
July 2007
Film capacitors – Capacitors for Power Factor Correction
WindCap capacitors
B25668A6836A375
MKK690-D-12.5-11
Terminals
Degree of protection
Max. torque
Terminal cross section
Maximum terminal current
Creepage distance
Clearance
Isolated terminals, IP20
1.2 Nm
16 mm
2
(5 AWG)
50 A
12.7 mm
9.6 mm
Safety
Mechanical safety
Max. short circuit current
Discharge resistor time
Overpressure disconnector
AFC: 10 kA
≤
1 min (75 V)
Reference Standards
IEC 60831-1/2, UL 810 (5th edition)
Certification: cUL file E238746
Cautions and warnings
In case of dents of more than 1 mm depth or any other mechanical damage, capacitors must not
be used at all.
This applies also in cases of oil leakages.
To ensure the full functionality of the overpressure disconnector, elastic elements must not be
hindered and a minimum space of 12 mm has to be kept above each capacitor.
Do not handle the capacitor before it is discharged.
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 against over current and short circuit.
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 on
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. Discharge and short circuit capacitor before
handling!
FK PFC R&D
Page 4 of 8
July 2007
Film capacitors – Capacitors for Power Factor Correction
WindCap capacitors
B25668A6836A375
MKK690-D-12.5-11
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
Electrical or mechanical misapplication of capacitors may be hazardous. Personal injury or property
damage may result from bursting of the capacitor or from expulsion of oil or melted material due to
mechanical disruption of the capacitor.
Ensure good, effective grounding for capacitor enclosures.
Provide means of disconnecting and insulating a faulty component/bank.
The terminals of capacitors, connected bus bars and cables as well as other devices may also be
energized.
Follow good engineering practice.
Thermal load/over-temperature
After installation of the capacitor it is necessary to verify that maximum hot-spot temperature is not
exceeded at extreme service conditions.
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. 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 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.
Do not use HRC fuses to switch capacitors (risk of arcing).
Use thermal magnetic over current relays for overload protection.
FK PFC R&D
Page 5 of 8
July 2007
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