Element Resistance Measurement in an Electricity Meter

摘要

A method measures a resistance of an element that is operably coupled to receive an AC line voltage. The method includes obtaining a first voltage measurement value V1A from a first side of the element at a first time, and obtaining a second voltage measurement value V2A from a second side of the element at the first time. The method also includes obtaining a first current measurement value IA through the element at the first time, and obtaining a second current measurement value IB through the element at the second time. The method further includes obtaining a third voltage measurement value V1B from the first side of the element at a second time, and obtaining a fourth voltage measurement value V2B from the second side of the element at the second time. The processing device determines the resistance at least in part based on the values V1A, V2A, V1B, V2B, IA and IB. The determination based on an adjusted difference of V2B and V2A.

主权项

1. A method of measuring a resistance of an element, comprising:
a) obtaining a first voltage measurement value VIA from a first side of the element at a first time, the element operably coupled to receive an AC line voltage; b) obtaining a second voltage measurement value V2A from a second side of the element at the first time; c) obtaining a first current measurement value IA through the element at the first time; d) obtaining a third voltage measurement value V1B from the first side of the element at a second time; e) obtaining a fourth voltage measurement value V2B from the second side of the element at the second time; f) obtaining a second current measurement value IB through the element at the second time; and g) using a processing device to determine the resistance at least in part based on the values V1A, V2A, V1B, V2B, IA and IB, the determination based on an adjusted difference of V2B and V2A.