| US 7,561,399 B2 | ||
| Excessive surge protection method and apparatus | ||
| Byron Slater, Lafayette, Ind. (US); and Saieb Alrawi, West Lafayette, Ind. (US) | ||
| Assigned to Landis+Gyr, Inc., Lafayette, Ind. (US) | ||
| Filed on Feb. 09, 2006, as Appl. No. 11/351,179. | ||
| Application 11/351179 is a division of application No. 09/748720, filed on Dec. 26, 2000. | ||
| Prior Publication US 2006/0126255 A1, Jun. 15, 2006 | ||
| Int. Cl. H02H 1/00 (2006.01) | ||
| U.S. Cl. 361—118 [361/117] | 11 Claims |
| 1. An electricity meter for measuring electrical power consumed by a load, the electricity meter comprising:
a voltage input coupled to an electrical power line;
a current input operably coupled to the electrical power line;
a measurement device operably connected to the voltage input and the current input, the measurement device operable to generate
electrical power consumption measurements based upon the voltage and current in the electrical power line; and
a surge protection apparatus, the surge protection apparatus including an inductor and a protective barrier, the inductor
coupled between the voltage input and the measurement device, the protective barrier configured to physically isolate the
inductor from the measurement device, the surge protection apparatus further comprising a polymeric positive temperature coefficient
device (PPTC) coupled in series with the inductor between the voltage input and the measurement device, the protective barrier
configured to physically isolate the PPTC from the measurement device;
a resistor connected in series between the PPTC and the measurement device; and
a metal oxide varistor (MOV) operably connected at a first end between the resistor and the measurement device and at a second
end to ground.
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