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Troubleshooting

These articles are intended to assist rig electricians in identifying and resolving technical issues. Although offered in good faith Contrelec accepts no responsibility whatsoever for direct or indirect consequences arising from the use of these guides. If in doubt, contact us to discuss your specific issues.

Difference Between Integrating and Non-Integrating Ross Hill AC Modules

Last Updated: 01 March 2016 | Written by Gary Barnes | Hits: 0
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Rig electricians may be confused by the terms 'integrating' and 'non-integrating' with respect to Ross Hill AC Modules. This article explains the difference.

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How to Commission a Generator Section

Last Updated: 01 March 2016 | Written by Gary Barnes | Hits: 0
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This article describes the process of electrically commissioning (or re-commissioning) a generator section for a Ross Hill or Hill Graham SCR system. It could be adapted to other makes and models because many of the basic principles are the same between manufacturers, and is serves as a useful troubleshooting guide.

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Surge Suppression for Drilling Rigs

Last Updated: 01 March 2016 | Written by Gary Barnes | Hits: 0
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Two different methodologies are deployed on Drilling Rigs for Surge Suppression, but which is the better?

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Troubleshooting SCR Firing Problems

Last Updated: 01 March 2016 | Written by Gary Barnes | Hits: 0
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Noisy motors, overheating transformers - it all adds up to SCR mis-firing: The Black Dog Problem.

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Differences Between Shunt and Series DC Motors on Drilling Rigs

Last Updated: 01 March 2016 | Written by Gary Barnes | Hits: 0
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A typical drilling rig will be equipped with either shunt or series wound motors, rarely a mixture a of both. The type of motor chosen is made at the system design stage and is unlikely to change through the lifetime of the rig. This article describes the parameters which inform the decision to use either.

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Power Factor Correction for Drilling Rigs

Last Updated: 01 March 2016 | Written by Gary Barnes | Hits: 0
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SCR systems deliver a notoriously poor power factor. Compensation is built into the design of the engine and generator combination, so the question that is often asked is: Can I get more power to my Mud Pumps with Power Factor Correction?

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Troubleshooting Power Limit Problems (Ross Hill, Hill Graham SCR Systems)

Last Updated: 01 March 2016 | Written by Gary Barnes | Hits: 0
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It is an unfortunate characteristic of SCR systems that the Power Factor (the relationship between real and reactive power) is poor - often down as low as 0.4 - which maeans that the KW capacity of the engines is under-utilised. This often leads to frustration because the rig runs out of power, yet the engines may be only delivering half of their full-load capacity. This article explains how the Power Limit system works and what can be done to ensure it is working at its optimal level.

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Troubleshooting Mud Pump Field Supplies (Ross Hill, Hill Graham SCR Systems)

Last Updated: 01 March 2016 | Written by Gary Barnes | Hits: 0
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One of the most common problems encountered with Ross Hill or Hill Graham type Mud Pump Field supplies is field unbalance tripping, which causes the main DC contactors to open and requires a reset. The problem is more likely to occur under heavy load conditions, and resluts in the complete loss of the Mud Pump, so is a particular nuisance. This article describes some of the measures you can take to identify and resolve the problem.

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