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RGB Oil-Cooled Rectifiers |
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Oil cooling provides
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| Protection from corrosion.
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| Efficient cooling of the electrical components.
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Allows siting next
to the plating vat, or outdoors.
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Reliability
and low maintenance
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| Silent operation | |
| 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. | |
| Deep drawn folds in the vertical walls of the steel oil tanks ensure efficient cooling. | |
| Natural oil cooled rectifiers with finned design are available up to 15,000 Amps.For higher outputs we specify combination oil/water cooling or recommend our radiator design. | |
| Construction | |
| Regulating transformer, mains transformer, silicon-stack, shunt, copper bus-bar connection etc. are all mounted on a sturdy steel frame which is lowered into the finned steel tank. | |
| Meters and controls together are fitted in the door(s) of the cabinet, or, when required, in a separated remote control cabinet. | |
| The top-plate supports a cabinet housing terminals for mains input, meters, and controls together with contactors, fuses, and other protection and control devices. D.C output connections are fitted to this cabinet for smaller rectifiers and to the top-plate for larger rectifiers. | |
| Oil-level indicator, oil filler cap, and drain tap are located for easy viewing and access. | |
| Lifting eyes and heavy duty castors are provided for easy installation. | |
| 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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