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Potential Electrical Protective Relay Problems Every piece of electrical equipment on every rig is installed with a device or devices of some type to prevent damage, ranging from the simplest, fuses, to complex protective relays. These devices are used to isolate equipment from the problem when conditions exist that can cause damage, including under and over voltage, current, frequency, load imbalance and some combinations of the above. While conducting generator testing on one rig recently, a generator tripped off-line on two occasions due to differential current. The load imbalance in this case was a difference of 1.65 MW between transformer phases, which would cause a fire. However, both times, no problem was identified. The drilling contractor contacted the manufacturer, GE, and learned of potentially defective protective equipment.
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