[EPCOS POWER FACTOR CORRECTION]
 

PHASECAP ® AC CAPACITORS - [ HIGH INRUSH CURRENT WITHSTAND CAPABILITY IS CRUCIAL ]

Capacitors used for power factor correction undergo a lot of switching operations. The high inrush currents that to along with this must be handled without degrading useful life. The pulse strength of this technology comes in particular from the enlarged contact area ( heavy edge metalization) and metal sprayed contact (face side winding element)

AND WHERE IT IS CRUCIAL

Parallel connection of capacitors.
Non-detuned capacitors.
Capacitor bank using standard contactors.

PHASECAP ® AC CAPACITORS - [ USEFUL LIFE UP TO 100,000 OPERATING HOURS ]

After a long drying phase in high vacuum to eliminate moisture from the active element, the capacitor is filled with biodegradable soft resin. This production helps to avoid oxidation and partial discharges, promoting capacitance stability over a long period. Phicap is a self-healing, metalized polypropylene film capacitor. The current carrying AIZ mental layer (the best alloy for an electrode) is vapor-deposited once one side of the film, the surface of the dieelectric.

PHASECAP ® AC CAPACITORS - [ COMPACT DESIGN - LOW WEIGHT AND VOLUME ]

The entire three-phase capacitor is composed of three single-phase element stacks. The electrodes are connected by metal spraying the face ends of the winding elements. The winding elements are encapsulated in a cylindrical aluminum case and hermetically sealed by a press rolled metal lid or plastic disk with fast-on terminals.

PHICAP ® AC CAPACITORS - [ DUAL SAFETY SYSTEMS]

Self-healing: the capacitor repairs itself after overload. Self-healing capability prevents permanent dielectric breakdown in the event of sporadic voltage surges, over current or over temperature.

Overpressure disconnector: this prevents the capacitor from bursting at the end of its useful life or through electricalor thermal overload. In the event of permanent self-healing attempts caused by repetitive, very highpeak voltages or other overload, there can be permanent breakdown. The safety switching device is then activated and disconnects the capacitor winding elements from the power source by an internal pressure increase (expansion of the capacitor case).

PHICAP ® AC CAPACITORS - [ DESIGN TIPS ]

Because of the increase in capacitor height on breakdown, it is necessary to provide enough clearance above the capacitor terminals.

PHASECAP ® AC CAPACITORS - [CONNECTION TECHNOLOGY]

Simplified parallel connection of capacitors (double fast-on-terminal or double wire clamping screw terminals) Discharge resistor already mounted; standard for extra reliability and safety. Cable Connection layout (terminals) for secure, safe clamping of required cable cross-section.

PHASECAP ® AC CAPACITORS - [ PHI CAP SELECTION ]

When specifying and selecting capacitors for PEC, there are several factors affecting performance and useful life.

Voltage,

Harmonics,

Temperature,

Inrush current.

Permanent overvoltage shortens the useful life of a capacitor. The capacitors nominal voltage must be equal to or greater than the operating voltage of the circuit the capacitor will be connected to.  Harmoncis produce overvoltage and overcurrent on capacitors. If the total harmoinc distortion level for voltage exceeds 5% for example, serious damage can be caused by circuit resonace. In such cases series reactors (detuning) and recommended.

Operation of capacitors above the upper catagory temperature will accelerate degradation of the dielectric and shorten the capacitor's useful life.

Residual voltage should not exceed 10% of rated voltage when reswitching capacitors. During the charging period of capacitors the current is very high - in automatic capacitor bank it is very like that discharged capacitors will be connected to charged ones already connected to the grid. In such cases the maximum admissible transient peak current is 100 * IN.

During the switching process, thermal and electrodynamics stress is produced by transient overcurrents of high amplitude and frequency and may damage the system. Capacitor contactors with precharging resistors or series inductance (twinned cables between contactor and capacitor) will avoid excessive transient currents.