Meter testing device
First Claim
1. A self-contained portable apparatus for testing the accuracy of watt-hour meter at its operational site, the meter having contacts for connection with electrical power line terminals, and having contacts for connection with electrical load terminals, the meter being adapted for connection with said terminals, comprising:
- a. a phantom load means, said phantom load means being adapted for connection with said electric power line terminals and said electric load terminals at the meter operatinal site, the phantom load means being a low load representative of a higher load and including a loading transformer;
b. watt transducer means electrically connected with said loading transformer whereby the loading transformer generates a prescribed current to the meter and the watt transducer, thereby simulating a higher watt load than actually applied to said transducer and meter; and
c. calculating means for comparing over a time period, the watt-hours from the phantom load means through the watt transducer relative to the watt-hours from the phantom load means through the meter for providing information representative of the accuracy of the meter, said information being obtained from said calculating means.
0 Assignments
0 Petitions
Accused Products
Abstract
An apparatus and method for verifying the accuracy of watt-hour meters at their operational site includes applying a phantom load to the meter and to a watt transducer. The relative watt hour readings of the meter are compared to the watt hours computed from the power to the watt transducer and represented as a percentage error of the meter. The phantom load is constituted by a loading transformer with optional load adjustments to take into account different loads to the meter and there are also adjustment means to take into consideration different meter characteristics. The meter watt hour reading is determined from an articulated light generating and receiving means mounted in alignment with the revolving disc so that light passes through the aperture in the disc to the receiving means and then signals the verifying apparatus to give an indication of the watt hour reading of the meter. Alternatively the reading is obtained manually.
30 Citations
14 Claims
-
1. A self-contained portable apparatus for testing the accuracy of watt-hour meter at its operational site, the meter having contacts for connection with electrical power line terminals, and having contacts for connection with electrical load terminals, the meter being adapted for connection with said terminals, comprising:
-
a. a phantom load means, said phantom load means being adapted for connection with said electric power line terminals and said electric load terminals at the meter operatinal site, the phantom load means being a low load representative of a higher load and including a loading transformer; b. watt transducer means electrically connected with said loading transformer whereby the loading transformer generates a prescribed current to the meter and the watt transducer, thereby simulating a higher watt load than actually applied to said transducer and meter; and c. calculating means for comparing over a time period, the watt-hours from the phantom load means through the watt transducer relative to the watt-hours from the phantom load means through the meter for providing information representative of the accuracy of the meter, said information being obtained from said calculating means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
Specification