DUCA Power - Heavy Duty Capacitors:

TECHNOLOGY

“Duca Power” Heavy Duty Capacitors satisfies the demand for a product with durability features that are far superior to those provided by the usual metallized polypropylene technology . "Duca Power" with Inert Gas & Resin Impregnated technology is used for power factor correction in Industrial & Office electrical networks. This series has been designed to cater to the most demanding users where operating conditions are particularly critical and where reliability is of prime importance. The capacitors used are characterized by the dielectric impregnated with a Inert Gas & Resin mixed together. In this respect they differ from metallized polypropylene capacitors in which during operation, the air contained between the plates leads to the production of partial discharge which in turn cause the dielectric to age rapidly. Impregnation with Inert Gas as well with resin ensures the long life of capacitor bank. The capacitive elements are housed in a cylindrical container made of aluminium, equipped with an individual over pressure protection device. All of the materials employed are non-toxic and biodegradable. Thanks to the above characteristics, the capacitor has an expected life which greatly exceeds 1,50,000 hours. It is characterized by the capability of bearing high harmonic components up to R.M.S. Current level in excess of 4 In.

In last few years there has been increase of non-linear loads like variable speed drives, UPS and computers in many industrial and Office electrical network. These non-linear loads generate current and voltage harmonics. P.F. improvement in these conditions become difficult as capacitors get overloaded because of harmonics and their application also may result in resonance conditions, making the condition further worse. There is often felt a need of a very reliable P.F. correction capacitor which shall not only withstand high RMS current but also offer long operational life under sustained harmonics overloads. This modular series is best suited for this application.   TECHNICAL SPECIFICATIONS   Voltage (Un) : .....................................450 V - 550 V Rated frequency : ..............................50 Hz Capacitance tolerance :..................... -5 + 10% A.C. test voltage bet. terminals :......... 2, 15 Un per 10" A.C. test voltage bet. terminals : ........3 kV per 10” & case Installation :......................................... Internal Operating Temperature : ...................-25 + 700C Altitude : ...........................................< 2000 m Service : ...........................................Continuous Protection degree :............................ IP 30 Discharge resistor :.......................... Internal ...........................................................(50V after 1 min) Maximum permissible current :........... 4 In Maximum Inrush Current :................. 450 In Terminals : ........................................3 x M 8 Dielectric losses : ............................ < 0.2 W/kvar Reference standard :........................ EN 60831-1/2; ..........................................................IEC 831-1/2   It is recommended to used oversized capacitors in terms of Voltage in presence of a moderate Harmonic loads. Capacitor voltage to be selected for use in detuned filter circuits depends upon filtering factor of Reactors.