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FMCC EUROPE
Components and technical solutions for power electronics
IGCT Protection
Introduction NCL GCT capacitors are designed to meet the requirements of the traction industry and for static drive applications. They are built to extremely high standards, offering enhanced properties over other similar looking designs. Wound with a combination of metallised polypropylene film and extended aluminium foil electrodes, in conjunction with a stable, biodegradable liquid impregnant ensures extremely long life and reliable self-healing capabilities are assured. The loss angle (tandf) is extremely low (<0.0003 at 1kHz) and the aluminium foil electrodes provide excellent thermal characteristics. Application NCL GCT capacitors are designed for the severe duties of gate-commutated thyristors (GCT's). They are also for tuning applications in the medium frequency range. | Technology The advanced polypropylene dielectric system of these capacitors has been specially developed for high peak current and surge voltage applications. Features
Encapsulated in fire-resistant epoxy resin, the extremely strong robust mechanical design is suitable for the rigours of traction duty, especially vibration conditions and high ambient temperatures. M8x8 mm axial connections are provided, which are securely bonded to the foil electrodes |
Characteristics
The following parameters are applicable to the range of capacitors which appear on the following pages. As mentioned above, should a particular combination of capacitance value or voltage not be available or should there be a dimensional constraint, please contact us for a design suited to your particular needs.
| Capacitance value: | 0.25µF to 4.0µF |
| Tolerance: | ± 5% |
| Voltage rating (Udc): | 2200V to 3300V |
| Peak repetitive voltage (UN): | 3200V to 4800V |
| Peak non-repetitive voltage (Us): | 4000V to 6000V |
| Maximum surge current: | 2600A to 23500A |
| Loss angle (tandf): | <0.0003 at 1 kHz |
| Insulation resistance: | >10,000 sec |
| Current rating: | Up to 120 A rms depending on capacitance, voltage rating and thermal constraints |
| Operating temperature (qamb): | -40 to +70°C |
| Storage temperature: | -40 to +85°C |
| Connections/tightening torque: | M6 x 6 mm internal thread brass connection - 3 Nm M8 x 8 mm internal thread brass connection - 6 Nm |
| International standard: | In accordance with IEC 61071 & IEC61881 |