Abstract: A system for powering down-hole instrumentation/equipment used with an electrical submersible pump that has a motor and a cable, the system comprising a down-hole current transformer operable to convert a current in a phase of the cable to power down-hole instrumentation.

Abstract: A system for powering down-hole instrumentation/equipment used with an electrical submersible pump that has a motor and a cable, the system comprising a down-hole current transformer operable to convert a current in a phase of the cable to power down-hole instrumentation.

Abstract: This invention relates to a power line communication (PLC) system wherein the power supply line supplies power and also acts as a communications supply line. A receiver is able to detect small changes in the modulated transmitted information and thereby shut down the circuit. The invention is particularly suitable for use where the IEL is remote from the power supply such as, for example, in down hole oil production situations where very long power cables are used.

Abstract: This invention relates to a power line communication (PLC) system wherein the power supply line supplies power and also acts as a communications supply line. A receiver is able to detect small changes in the modulated transmitted information and thereby shut down the circuit. The invention is particularly suitable for use where the IEL is remote from the power supply such as, for example, in down hole oil production situations where very long power cables are used.

Abstract: A power line communications technique (PLC) is disclosed which allows communications across any three phase electric system by modulating the impedance through earth between any two points of differing voltage on the electrical system in order to use the power supply as the communications power source thereby using the power supply current as the communications carrier. No additional coupled communications source is required and modulation of an earth link current at the power frequency is especially suitable for remote electrical loads, such as an oil well electric submersible pump, where it is most cost effective to only have the three power conductors and no neutral nor signal wires in the power cable. Embodiments of the invention are described.

Abstract: This invention relates to a power line communication (PLC) system wherein the power supply line supplies power and also acts as a communications supply line. A receiver is able to detect small changes in the modulated transmitted information and thereby shut down the circuit. The invention is particularly suitable for use where the IEL is remote from the power supply such as, for example, in down hole oil production situations where very long power cables are used.

Abstract: A power line communications technique (PLC) is disclosed which allows communications across any three phase electric system by modulating the impedance through earth between any two points of differing voltage on the electrical system in order to use the power supply as the communications power source thereby using the power supply current as the communications carrier. No additional coupled communications source is required and modulation of an earth link current at the power frequency is especially suitable for remote electrical loads, such as an oil well electric submersible pump, where it is most cost effective to only have the three power conductors and no neutral nor signal wires in the power cable. Embodiments of the invention are described.