CAPACITIVE VOLTAGE SENSOR
First Claim
1. Apparatus for monitoring the voltage of electricity supplied on a cable, comprising:
- a sense electrode sensor unit housed in an electrically-insulative housing and configured and arranged to form a capacitive coupling between the sense electrode and the cable;
a sense capacitor disposed in the housing and of known capacitance, wherein the sense capacitor is electrically coupled to the sense electrode and, without direct physical connection, capacitively coupled to a local ground; and
a voltage measurement circuit connected to the sense capacitor and responsive to voltage produced across the sense capacitor to provide an output signal the phase of which is representative of the phase of the voltage on the cable.
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Accused Products
Abstract
Apparatus for monitoring the voltage of electricity supplied on a cable (121) are described. The apparatus includes a sense electrode housed in an electrically-insulative housing to form a capacitive coupling (127) between the sense electrode and the cable. The housing may be of the clamp-on type. A sense capacitor (128) of known capacitance is included, which is electrically coupled to the sense electrode and a local ground. Suitable voltage measurement circuitry (126) is connected to the sense capacitor and is responsive to voltage produced across the sense capacitor to provide an output signal representative of the voltage on the cable. The measured voltage waveform can be filtered to give the fundamental of the supply voltage, which can eliminate or reduce the effects of changes in capacitance within one cycle. A secondary capacitive (130) coupling can be formed with a related neutral wire (122) to improve stability of the voltage waveform measurement.
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Citations
28 Claims
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1. Apparatus for monitoring the voltage of electricity supplied on a cable, comprising:
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a sense electrode sensor unit housed in an electrically-insulative housing and configured and arranged to form a capacitive coupling between the sense electrode and the cable; a sense capacitor disposed in the housing and of known capacitance, wherein the sense capacitor is electrically coupled to the sense electrode and, without direct physical connection, capacitively coupled to a local ground; and a voltage measurement circuit connected to the sense capacitor and responsive to voltage produced across the sense capacitor to provide an output signal the phase of which is representative of the phase of the voltage on the cable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. Apparatus for monitoring the voltage of electricity supplied on a cable, comprising:
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a sense electrode sensor unit housed in an electrically-insulative housing and configured and arranged to form a capacitive coupling between the sense electrode and the cable; a sense capacitor disposed in the housing and of known capacitance, wherein the sense capacitor is electrically coupled to the sense electrode and, without direct physical connection, capacitively coupled to a neutral line associated with a live line of the cable; and a voltage measurement circuit connected to the sense capacitor and responsive to voltage produced across the sense capacitor to provide an output signal the phase of which is representative of the phase of the voltage on the cable. - View Dependent Claims (26, 27, 28)
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Specification
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- Resources
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Current AssigneeSSE Plc
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Original AssigneeOnzo Ltd.
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InventorsDames, Andrew Nicholas, Tierney, Neil MacLachlan, Pirt, Benjamin John, Rosewell, Neil Alexander, Storkey, Matthew Emmanuel Milton
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Application NumberUS12/601,527Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current702/62CPC Class CodesG01D 4/002 Remote reading of utility m...G01R 22/063 related to remote communica...Y02B 90/20 Smart grids as enabling tec...Y04S 20/30 Smart metering, e.g. specia...
