Coupling of Communications Signals to a Power Line
First Claim
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1. A system for coupling communications signals to a medium-voltage power line, the system comprising:
- a metal oxide varistor electrically coupled to a medium-voltage power line;
a disconnect device electrically coupled to the metal oxide varistor, the disconnect device comprising a resistor and an air gap, the disconnect device having a resistance of at least one thousand ohms and a capacitance between one picofarad and twelve picofarads;
a conductor electrically coupling the disconnect device to a ground without the use of ferrites;
a communications device comprising at least one modem; and
a coupler electrically coupling the communications device to the metal oxide varistor, the coupler electrically coupled in parallel with the disconnect device and comprising an impedance transformer and a capacitor;
wherein the disconnect device is configured such that it does not affect the characteristic impedance of the impedance transformer.
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Abstract
In one embodiment, a system for coupling a communications signal to a medium-voltage power line includes a surge arrester electrically coupled to a medium-voltage power line and a disconnect device electrically coupled to the surge arrester. The disconnect device is electrically coupled in parallel with a communications device and has a resistance of at least one thousand ohms and a capacitance between one picofarad and twelve picofarads. Furthermore, the disconnect device is electrically coupled to a ground without the use of ferrites.
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Citations
13 Claims
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1. A system for coupling communications signals to a medium-voltage power line, the system comprising:
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a metal oxide varistor electrically coupled to a medium-voltage power line; a disconnect device electrically coupled to the metal oxide varistor, the disconnect device comprising a resistor and an air gap, the disconnect device having a resistance of at least one thousand ohms and a capacitance between one picofarad and twelve picofarads; a conductor electrically coupling the disconnect device to a ground without the use of ferrites; a communications device comprising at least one modem; and a coupler electrically coupling the communications device to the metal oxide varistor, the coupler electrically coupled in parallel with the disconnect device and comprising an impedance transformer and a capacitor; wherein the disconnect device is configured such that it does not affect the characteristic impedance of the impedance transformer.
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2. A system for coupling a communications signal to a medium-voltage power line, the system comprising:
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a surge arrester electrically coupled to a medium-voltage power line; a disconnect device electrically coupled to the surge arrester and electrically coupled in parallel with a communications device, the disconnect device having a resistance of at least one thousand ohms and a capacitance between one picofarad and twelve picofarads; wherein the disconnect device is electrically coupled to a ground without the use of ferrites. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification