System and method for detecting the presence of an unsafe line condition in a disconnected power meter
First Claim
1. A method for detecting the presence of an unsafe condition at a power metering device comprising:
- providing the power metering device, the powering meter device interposed between a voltage source and a load, the voltage source coupled to the power metering device through a first source contact and a second source contact, the power metering device coupled with the load through a first load contact and a second load contact, the power metering device having a disconnect switch positioned between the voltage source and the load, the power metering device having a first bypass resistor and a second bypass resistor, the first bypass resistor coupled between the first source contact and the first load contact, the second bypass resistor coupled between the first source contact and the second load contact,determining if the disconnect switch is in an open position,measuring a first voltage at said first load contact;
measuring a second voltage at said second load contact;
determining if the first voltage is greater than a first voltage threshold or less than a second voltage threshold;
determining if the second voltage is greater than a first voltage threshold or less than a second voltage threshold;
indicating that an unsafe condition exists if either;
a) the first voltage is greater than the first voltage threshold;
or,b) the second voltage is less than the second voltage threshold;
or,c) the second voltage is greater than the first voltage threshold;
ord) the first voltage is less than the second voltage threshold; and
,the disconnect switch is in the open position.
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Accused Products
Abstract
A method of detecting the presence of an unsafe line condition at a power metering device is disclosed. The method comprises the steps of determining if a disconnect switch is in the open position, and measuring a first voltage at a first load contact. The method measures a second voltage at a second load contact and determines if the first voltage is greater than a first voltage threshold or less than a second voltage threshold. The method further determines if the second voltage is greater than the first voltage threshold or less than the second voltage threshold. The method indicates that an unsafe condition exists if either the first voltage is greater than the first voltage threshold, or first voltage is less than the second voltage threshold or the second voltage is greater than the first voltage threshold or the second voltage is less than the second voltage threshold, when the disconnect switch is in the open position.
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Citations
25 Claims
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1. A method for detecting the presence of an unsafe condition at a power metering device comprising:
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providing the power metering device, the powering meter device interposed between a voltage source and a load, the voltage source coupled to the power metering device through a first source contact and a second source contact, the power metering device coupled with the load through a first load contact and a second load contact, the power metering device having a disconnect switch positioned between the voltage source and the load, the power metering device having a first bypass resistor and a second bypass resistor, the first bypass resistor coupled between the first source contact and the first load contact, the second bypass resistor coupled between the first source contact and the second load contact, determining if the disconnect switch is in an open position, measuring a first voltage at said first load contact; measuring a second voltage at said second load contact; determining if the first voltage is greater than a first voltage threshold or less than a second voltage threshold; determining if the second voltage is greater than a first voltage threshold or less than a second voltage threshold; indicating that an unsafe condition exists if either; a) the first voltage is greater than the first voltage threshold;
or,b) the second voltage is less than the second voltage threshold;
or,c) the second voltage is greater than the first voltage threshold;
ord) the first voltage is less than the second voltage threshold; and
,the disconnect switch is in the open position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power meter capable of detecting the presence of an unsafe condition, the power meter coupled to a voltage source through a first and second source contacts, the power meter coupled to a load through a first and second load contacts, the power meter measuring power flowing from the voltage source to the load, the power meter comprising:
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a disconnect switch, the disconnect switch interposed between the first source contact and the first load contact, and the second source contact and the second load contact, the disconnect switch interrupting the flow of power from the voltage source to the load when the disconnect switch is in an open position; a first bypass resistor coupled between the first voltage source contact and the first load contact, a second bypass resistor coupled between the first source contact and the second load contact, a load side voltage sensing circuit, the load side voltage sensing circuit coupled to the first load contact and a second load contact, the load side voltage sensing circuit measuring a first voltage at the first load contact and measuring a second voltage at the second load contact, the load side voltage sensing circuit determining; a) if the first voltage is greater than a first voltage threshold or b) if the first voltage is less than a second voltage threshold, or c) if the second voltage is greater than a first voltage threshold;
or,d) if the first voltage is less than a second voltage threshold; and
,a processing circuit coupled to the disconnect switch and the load side voltage sensing circuit, the processing circuit determining if the disconnect switch is in the open position, the processing circuit indicating that an unsafe condition exists when either the first voltage is greater than the first voltage threshold or, the first voltage is less than the second voltage threshold, or the second voltage is greater than the first voltage threshold or the second voltage is less than the second voltage threshold, and the disconnect switch is in the open position. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification