Power Factor Correction Capacitors are used for the purpose of improving Power Factor in low voltage power networks. Our capacitors use an MKP technology that consists of metalized polypropylene (PP) film that has an extremely low loss factor. The dielectric system is self-healing and has no liquid impregnate. Capacitor elements are enclosed in cylindrical aluminum cases and are filled with a vegetable oil based gel which is non-toxic, biodegradable and environmentally friendly.
The capacitors have over-pressure protection to disconnect it from the supply in the event of internal failure and at the end of its operational life.
Overpressure Disconnect
Three phase capacitors are delta connected. Delta connected three phase capacitors are friendlier to the electrical environment than others (i.e. Wye connected). They not only provide capacitance to each phase but also provides no voltage unbalances.
If a capacitor cell should fail for any reason in one phase it will move from a closed delta to an open delta configuration. In this instance the voltage on each phase stays the same. Failure of a capacitor cell would only mean a drop in the kVAR on the circuit. In other words, a 30kVAR delta connected three phase capacitor with a failed cell would provide 20kVAR to the electrical system instead of 30kVAR.
Delta connected capacitors are also capable of circulating harmonic currents to some degree within the delta circuit and by doing so help to reduce the harmonics on the electrical system.
The capacitors can be installed in any position. Mounting is by M12 stud on the bottom and this can also be used for the earth connection - max tightening torque 5 Nm. Connection in terminal is done by M5 screws - max torque 2 Nm. Connecting cables must permit the capacitor top to rise by 20 mm to ensure correct operation of the over-pressure disconnector. For expansion the upper part of the capacitor must be free without any fixing clamp. If necessary, fixing clamps can be mounted on the lower capacitor part below the groove only.
General Specifications
Rated Voltage: 230, 480, 600, 690
Frequency: 50 / 60 Hz
Standards: IEC 60831-1/2, GOST 1282-88, VDE 0560-46/47
Capacitance Tolerance: -5 / +10%
Max Permissible Current:1.5 x In Continuous - 2.0 x In Short Period*
Max Inrush Current:400 x In
Capacitor Losses:cca 0,4W / kVAR
Discharge Resistors:built in 75 V / 3 min (50 V /1 min up to 30kVAR
Statistical Life Expectancy: 150 000 hours according to operating conditions
Protection Degree:IP 20 (IP 54 selected types on request)
Max Relative Humidity:95 %
Cooling:Natural or Forced Air
Max Altitude:4000M
Mounting Position: Any Position
Case:Aluminium can
Dielectric System:Dry Metalized Polypropolene self healing
Impregnant / Filling:Inert gas N2 or semi-dry resin (50 kvar)
Safety Device:3
Safety Fuses:overpressure disconnector
Terminals:One side - 3 clamps
Temperature Category:-40/D (60C)
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*Note: Maximum current for 48 hours continuous operation with relation to highest mean ambient temperature of 450C over period of 24 hours.
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