Circuit for simultaneous testing of electricity meters with...

Details Circuit for simultaneous testing of electricity meters with... Circuit for simultaneous testing of electricity meters with...

2007-12-04

2007-12-04

Nguyen, Ha Tran (Department: 2829)

Electricity: measuring and testing

Testing and calibrating electric meters

C324S142000, C324S09900D

Reexamination Certificate

active

11020381

ABSTRACT:
Circuit arrangement for simultaneous testing of electricity meters with interconnected current and voltage circuits comprising plurality of said meters having all voltage terminals associated with the same phase connected parallel to respective voltage source and each of the current terminal pairs of the meters connected to the output of individual zero flux current transducer (ZFCT). The inputs (IW) of the zero flux current transducer, the outputs of which are associated with the same phase of individual meters, are connected in series to a respective current source (I). The zero flux current transducer consists of an input winding (IW), an output winding (OW), a sense winding (SW), a drive winding (DW), a sense core (SC), a drive core (DC) and an amplifier (A). The drive winding comprises the drive core only and the input, output and sense windings comprise both sense core and drive core. The sense winding is connected to high impedance input of the amplifier and the drive winding is connected to low impedance output of the amplifier. The gain of the amplifier is equal to the ratio of turns of the drive winding and sense winding.

REFERENCES:
patent: 2599378 (1952-06-01), Fleischmann
patent: 2701859 (1955-02-01), Coleman
patent: 2989696 (1961-06-01), Randolph
patent: 3304479 (1967-02-01), Kuris et al.
patent: 3841157 (1974-10-01), Willock
patent: 4616174 (1986-10-01), Jorgensen
patent: 5539304 (1996-07-01), Payne
patent: 6815942 (2004-11-01), Randall et al.

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