Nacházíte se v sekci Power capacitors FORTIS for PFC

Power capacitors FORTIS for PFC

n High capability n Performance up to 36 kvar n Dry fill n Safety n Long life expectance

Description

Three phase power capacitors FORTIS match modern standards a are designed for usage in power factor correction and improvement installations according to EN 60831-1,2 a IEC 831-1,2.

Safety of capacitor in use is guaranteed by self-healing dielectric, break action mechanism and discharge resistors, which allow safe discharge to less then 50 V after 60 s period.

Power capacitors FORTIS are suitable to low voltage networks for power factor improvement, reduction of thermal (reactive) losses and overall quality of electricity improvement.

• Design  —  cylindrical aluminum case with M12 (M16) mounting and earthing bolt, terminal block with discharge resistors and IP20 protection.
• Dielectric  —  metallized polypropylene film, viscose or dry (inert gas) fill.
• Available output  —  rated reactive power — from 1 up to 50 kvar for 400 , 440 or 525 V.
• Connection  —  three-phase, delta, Δ.
• Tolerance  —  max 5  % from rated reactive power.
• Losses  —  0,05 % (0,5 W/kvar), measured at terminal block with discharge resistors
• Life cycle  —  150 000 working hours
• Safety  —  self-healing dielectric, break action mechanism and discharge resistors
• Custom made capacitors  —  we are able to produce power capacitors with different outputs and measures.
• There are just most frequently produced and used types of capacitors mentioned in Table “Production range”.

Design

Today’s standard is MKP technology, which can be in short described as metallization of polypropylene foil with Zn-Al (selfhealing layer) under vacuum. Winded layer is after that placed to hermetically closed cylindrical cases with viscose (oil, gel) or dry (inert gas) fill. This impregnant insulates electrodes of capacitor from ambient and prevent them above all from corrosion of metallic parts.

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Measures of FORTIS KBH power capacitors

Capacitor connection

At terminal block of FORTIS capacitor there are six terminals at your disposal, which allows installation of discharge resistors, discharge reactors or parallel connection of another capacitor.

Supplied resistor modules ensure safe discharge of capacitor to 50 V AC within 60 s.

Design of terminal block guarantees hermetical tightness of case and comfortable of wirers with cross section up to 50 mm² (with ferrule max. 35 mm²)..

Terminal of capacitor

Scheme of discharge resistor

Self healing

In the event of electrical or thermal overload, or at the end of useful life of capacitor, several electrical arcs may occur, which evaporate metallization in the region of breakdown.

The pressure of gas, which was evaporated at that spot, blows vaporized metallization from that spot (place of breakdown) within microseconds. In that spot non-conductive isolation region is formed, which is reliable resistive and voltage proof for all operating requirements of the capacitor.

The reduction in capacitance caused by selfhealing is less than 100 pF, capacitor is fully functional.

Overpressure disconnector

Increasing number of self healings (e.g. at the end of life time or caused by frequent electrical and thermal overloading) can led to rise of internal pressure in capacitor. To avoid explosion of capacitor, every FORTIS KBH is equipped with innovative overpressure disconnector.

This mechanism is based on interruptible connection of inner wires to terminal block. Construction of lid allows its expansion. In case of rising internal pressure inside capacitor the lid expands. When defined limits are exceeded (e.g. the height of capacitor), inner wires are interrupted and capacitor is safely disconnected from network.

It should be noted that disconnecting mechanism works reliably, if recommended operating conditions are kept.

Safety instruction

All MKP capacitor contains 90 % of polypropylene, which combustibility is similar to gasoline (about 40 MJ/kg). With help of other technical solutions (measurement, detuning reactors, active filters, and ventilation) has to be ensured, that no human will be harmed and no property will be destroyed in case of malfunction of capacitor protective mechanism. Please keep and monitor required operating conditions,

Extinguish with foam or dry CO₂ extinguisher.

Selfhealing

Overpressure disconnector

Operating conditions

Allowed overvoltage and overcurrent

Exceeding of limits for voltage and current leads to shorter useful life of capacitor caused by dielectric degradation. In consequence basic technical parameters are changed and capacitor is not suitable to be operated under required conditions (e.g. insufficient performance).

Harmonic frequencies represent serious danger for capacitors. In networks with significant occurrence of harmonics it is necessary to filter them with appropriate detuning reactor. Harmonic overload usually warms up capacitor and can cause its malfunction, even destruction.

Operating temperatures and degree of protection

FORTIS capacitors are designed for inner installation in ambient with relative humidity up to 85 % (without dew) and ambient temperatures from -40 to +55°C, When higher temperatures occur (heat from reactors) it is strongly recommended to install forced ventilation.

Allowed overvoltage and overcurrent of FORTIS KBH capacitors

< 110 % UN	< 8 h/day	< 130 % IN	permanent
< 115 % UN	< 8 min/day	< 300 × IN	5000 switch/year
< 120 % UN	5 min, max 2x monthly
< 130 % UN	2 min, max 2x monthly