AST series static capacitor banks

Static power factor correction capacitor

The reactive power regulator has a switching time of the banks extremely quicker than the standard regulator. The device for switching the capacitors banks is electronic, controlled by thyristors, with the capability of switching the capacitors at zero crossing. Maximum speed in switching the capacitors banks (the total power is switched in less than one second). No current peak on the capacitors at the time of switching of the banks. No voltage peak on the capacitors at the time of switching off the banks. Elimination of problems related to contactor contact wear.


- Rated voltage: 400Vac
- Rated frequency: 50Hz (60Hz on request)
- Voltage of auxiliary circuits: 110Vac
- Working temperature range: -5°C/+50°C
- Cubicle: 20/10mm sheet steel, protected against corrosion by a phosphating treatment. Epoxy powder painted, RAL 7035 color (other colors on request) External Protection Degree: IP30 - - Locking system: by key
- Ventilation: Forced
- Isolating switch: Three-pole with door interlocking device
- Supplying: Entry of the cable from the bottom
- Wiring: By N07VK CEI 20-22 flame retardant cables. Auxiliary circuits are identified as in the electrical drawing
- Fuses: Each capacitor banks is protected by a set of three fuses (NH00 type) with high breaking capacity. Also the auxiliary circuits are protected by fuses.
- Activation: Thyristors zero-crossing static devices
- Capacitors 550 Vac Series Single phase of type self-heating, made up of metalized polypropylene, equipped with overpressure safety device and discharge resistor. Filling: biodegradable non toxic dry type, PCB free. Manufactured using new technologies of metallization. Delta connection. Capacitance tolerance: -5% +10% Dielectric losses: <0.3W/kvar Temperature class: -25°C (55°C)
- Self blocking resonant frequency: Tuning frequency 180Hz (3,6=7,7%)
- Regulators: Varmetric measurement by means of a C.T. (Current Transformer) (secondary 5A) not supplied
- Reference Standards: Complying with: L.V. 73/23 (93/68) EEC Directive Capacitors: CEI EN 60831-1/2 Equipment: CEI EN 60439-1
- Options (on request): Protection and Control Instrument SPC2 Protection Degree: IP40 - IP55 Entry of the cable from the top

Specific References