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RGB Air-Cooled Rectifiers |
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| Air cooling provides | |
| No forced draught fans | |
| Silent operation | |
| Easy access to all components | |
| Reliability and low maintenance | |
| Special Features | |
| Low ripple D.C. over the full operating range. | |
| Designed for reliable service and continuous duty. | |
| Economic operation by virtue of high efficiency. | |
| In-house fabrication facilitates special designs to suit individual requirements. | |
| Oil cooling of the regulating transformer is an added protection against corrosion. | |
| Construction | |
| Regulating transformer, mains transformer, silicon-stack, shunt, copper bus-bar connection etc. are all mounted on a sturdy steel frame within the rectifier cabinet. | |
| Meters and controls together are fitted in the door(s) of the cabinet, or, when required, in a separated remote control cabinet. | |
| Regulating transformers are for D.C. outputs above 500 Amps are oil-cooled. Below 500 Amps they are air cooled - but for corrosive atmospheres, oil cooling is an available option. | |
| Good air circulation through the silicon stack, mains transformer, and other components is achieved by an open base, canopy top, cabinet design. | |
| Bus-bar terminations for all but the smallest rectifiers pass through insulated supports positioned in the top, base, or rear, to suit individual requirements. | |
| The rectifiers are suitable for crane and fork-lift transport. | |
| Cabinet protection is to IP 21 as standard, other protection specifications are available. | |
| All exterior steelwork is finished with protective multi-layer coatings in a choice of colour :grey (RAL 7032), green (RAL6011), blue (RAL5009), or other colours as required. | |
| Specification | |
| A.C. Input | |
| 3x380V or 3x415V +/- 5% 50Hz, or as required | |
| Mains contactor fitted | |
| Meters and controls | |
| Moving coil ammeters and voltmeters (digital meters optional extras) | |
| Power ON signal lamp | |
| ON/OFF, RAISE LOWER buttons or switches | |
| Protection features | |
| Mains and control circuit fuses | |
| Electronic current overload | |
| Oil over-temperature cutout | |
| Silicon stack surge suppression | |
| Phase failure protection fitted for 20 KW and above | |
| Ratings | |
| Standard rectifiers are suitable for continuous duty up to 35 degrees C provided the rectifier is sited to allow free air circulation at maximum heights 1000 M above sea level. Non standard rectifiers are available for higher ambient temperatures and tropical conditions. | |
| Ripple | |
| Standard rectifiers: circa 5% over the full range of operation | |
| Output control | |
| 0-100% continuously variable stepless control by (a) handwheel or knob (b) by geared motor with meters and controls loose or alternatively in a remote cabinet. Additional controls available include process timers, ampere hour/minute meters, polarity reversers etc. | |
| Regulation | |
| By constant voltage or current controllers | |
| By integrated microrocessor | |
| Or connection to an external microprocessor, computer or PLC | |
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Air cooled silicon
rectifiers are available with thyristor control in place of regulating
transformer control. Ripple will then vary with the selected output
but may be optionally smoothed. Unsmoothed thyristor controlled
units have the same dimensions as units with regulating transformer
control.
In the interest of technical advancement, this general specification is subject to change. |
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