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MKPg-Druck_fürweb.qxp 13.09.2012 09:26 Seite 2 Along with the common standard-rated reactors (for the usual range A reactor with adjusted rating is considering this internal voltage of capacitors) we offer a range of special reactors which, combi- rise inside the series circuit of capacitor/reactor, and is matched ned with properly-rated capacitors, produce exactly the required to a specially dimensioned capacitor with reduced capacitance. kvar output at mains voltage, allowing for reduced size and cost of Advantage: The exact power is installed as required by the your installation. customer, and switching devices are stressed less. Both capacitor The kvar output of a capacitor depends on the voltage it is charged and reactor are smaller than the non-adjusted solution. Note that exact with. At higher voltage, equal capacitance delivers more kvar. sizing of the capacitor is necessary. A “non-adjusted reactor” is matched to a power capacitor with stan- dard rating at system voltage. This allows for use of capacitors “off For more detailed information, please order our comprehensive catalogue “Capacitors and Reactors for Power Factor Correction”. the shelf”, however with the increased output of kvar due to volta- ge rise inside the LC circuit, more power output is installed than actually required by the customer. GOOD CAPACITORS PFR-X POWER FACTOR CONTROLLER ALONE WON’T DO The PFR-X power factor controller calculates the active and reac- The rated mains voltage is the only value to be entered before tive power in the mains from the measured current and voltage. The commencing operation of the PFR-X. Without this entry, the intelligent control algorithm optimizes the switching sequences and controller blocks operation to protect the capacitors. All other guarantees for short regulation times with minimum number of swit- relevant parameters have been preset by the manufacturer for imme- chings. At the same time, switching operations are equally shared diate start of operation in nearly any common configuration. Individual among the available capacitor branches where possible. The inte- adjustment and optimization of the control parameters is possible grated connection control immediately detects in which phases at any time, even during operation of the equipment. voltage and current are measured, and adapts the entire system The controller will operate correctly even if the value of the automatically. The very low current threshold of 10mA allows for current transformer ratio has not been entered. It monitors the very reliable and exact PF control. 1A as well as 5A current trans- temperature inside the capacitor cabinet by means of an integrated formers can be used without additional manual adjustments. The power sensor. supply covers a voltage range of 90...550V. For more detailed information, please order our comprehensive catalogue “Capacitors and Reactors for Power Factor Correction”. MAKE SURE SPECIAL CAPACITOR CONTACTORS IT WORKS The contactors of the 17237.004 series have been optimized for butes to the high reliability and long operational life of our switching low-inductive and low loss capacitors in capacitor banks contactors. (IEC70 and 831, VDE 0560) without and with detuning reactors. They are fitted with pre-load contacts and damping resistors, in order to Since the disconnection of inductive loads is usually accompanied drastically reduce the inrush current, thus protecting the capacitors by switch arcs, the pre-load contacts of mechanical capacitor con- from destructive current surges, and the main contacts from tactors are often facing trouble when used with reactor-capacitor com- premature deterioration or welding. binations (detuned capacitors) as they are lagging behind the main contact during the switch-off process. The contactors of our 17237.004 Unlike most capacitor contactors which are using a mechanical prin- series are not affected by this problem as their pre-load contacts ciple for switching the pre-load contacts, the 17237.004 series swit- are already out of circuit. Hence they can be used for both detuned ches them by separate magnetic controls. As soon as the main and non-detuned capacitor installations. ELECTRONICON strongly switch has been closed, the pre-load contacts are released again recommends the usage of contactors with pre-load contacts even and its resistor wires taken out of circuit after no more than 5…10ms for detuned capacitors in order to prevent ferro-resonances of the reac- of operation. This avoids additional heat losses in the resistor wires tor during the start-up period. during the operation of the connected capacitor branch, and contri- 2