Introduction

Thyristor snubber capacitor technology, particularly for rectifier circuits where bi-directional voltages are experienced, have traditionally used film and foil construction in order to accommodate the ac conditions involved.

Application

NCL thyristor snubber capacitors are suitable for a wide range of inverter and converter applications. They are particularly useful for thyristor controlled rectifier circuits such as dc power transmission and traction lineside equipment.

Technology

NCL has developed a range of metallised capacitors, specifically for thyristor snubber applications, which are also fully ac rated. The special dielectric system ensures that the self-healing mechanism cannot produce catastrophic failure. In addition, the design ensures that high peak currents can be repetitively withstood without long term damage.

These capacitors are normally housed in fire resistant epoxy resin; a proven, extremely robust encapsulation, suitable for the rigours of severe vibration and high ambient temperature conditions of traction duty. Alternatively, although not detailed here, the older style metal-cased units may also be accommodated. Please contact us for these designs if required.

Characteristics

The following parameters are applicable to the ranges of capacitors which follow this introductory section. Should there be a particular combination of capacitance value or voltage not given, or should there be a dimensional constraint, please contact us for a design suited to your particular needs.

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