Apparatus for sensing and measuring a current on power transmission line
First Claim
1. An apparatus for sensing and measuring a DC or AC current on a power circuit, said apparatus comprising a shunt element constructed from a metal having a relatively stable resistance value and very small error over an operating temperature range of said shunt, said shunt element further having an input connection electrically connectable to said power circuit, a conductive housing connected directly to said shunt element and in series therewith for conducting said current from said shunt, said conductive housing having an output connection connectable to said power circuit for conducting current flowing through said shunt back to said power circuit;
- said housing defining a chamber, an electronic circuit means contained in said chamber and connected to an input tap and an output tap of said shunt element for sensing and measuring DC or AC current flowing through said shunt element;
said housing shielding said electronic circuit means from thermal effects of said shunt element, the magnetic field effect of the measured current, and environmental electrostatic interference;
said housing having a surface dimension sufficient to increase the heat dissipation caused by the current flowing through the shunt whereby said electronic circuit means is subjected to reduced temperatures much more inferior than the temperatures of said shunt element.
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Accused Products
Abstract
An apparatus for sensing and measuring a DC or AC current on an LV or HV power circuit. The apparatus comprises a shunt element having an input connected to the transmission line. The current flowing through the shunt is measured by an electronic circuit which is located in a conductive housing connected in series with the shunt element. The housing conducts the current from the shunt back to the power circuit. The housing is dimensioned to contain therein the electronic circuit whereby to shield the circuit from thermal effects of the shunt element, the magnetic field effect of the measured current, and environmental electrostatic interference.
17 Citations
12 Claims
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1. An apparatus for sensing and measuring a DC or AC current on a power circuit, said apparatus comprising a shunt element constructed from a metal having a relatively stable resistance value and very small error over an operating temperature range of said shunt, said shunt element further having an input connection electrically connectable to said power circuit, a conductive housing connected directly to said shunt element and in series therewith for conducting said current from said shunt, said conductive housing having an output connection connectable to said power circuit for conducting current flowing through said shunt back to said power circuit;
- said housing defining a chamber, an electronic circuit means contained in said chamber and connected to an input tap and an output tap of said shunt element for sensing and measuring DC or AC current flowing through said shunt element;
said housing shielding said electronic circuit means from thermal effects of said shunt element, the magnetic field effect of the measured current, and environmental electrostatic interference;
said housing having a surface dimension sufficient to increase the heat dissipation caused by the current flowing through the shunt whereby said electronic circuit means is subjected to reduced temperatures much more inferior than the temperatures of said shunt element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- said housing defining a chamber, an electronic circuit means contained in said chamber and connected to an input tap and an output tap of said shunt element for sensing and measuring DC or AC current flowing through said shunt element;
Specification