Power supply for measuring the line impedance of underground...

Details Power supply for measuring the line impedance of underground... Power supply for measuring the line impedance of underground...

2006-04-04

2006-04-04

Patel, Rajnikant B. (Department: 2838)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

C361S093100, C363S040000, C363S044000, C336S148000

Reexamination Certificate

active

07023675

ABSTRACT:
Disclosed is a power supply for measuring the line impedance of an underground cable, which includes an input terminal section having a plurality of input terminals, a plurality of autotransformers, a transformer adjustment tap, a plurality of 3rd-harmonics cancellation transformers, and an output terminal section having a plurality of output terminals. The autotransformers are connected respectively to the input terminals. The transformer adjustment tap is connected to all of the autotransformers. The 3rd-harmonics cancellation transformers are connected respectively to the autotransformers. The output terminals are connected respectively to the 3rd-harmonics cancellation transformers. The autotransformers are simultaneously controlled by the transformer adjustment tap so as to uniformly boost the powers supplied respectively to the autotransformers, and 3rd-harmonics of the powers are cancelled in the 3rd-harmonics cancellation transformers to remove noise, so that the powers are stably applied respectively to the phases of the underground cable.

REFERENCES:
patent: 3852641 (1974-12-01), Titus
patent: 4297738 (1981-10-01), Lee
patent: 5081411 (1992-01-01), Walker
patent: 5530748 (1996-06-01), Ohmori
patent: 6522119 (2003-02-01), Hernandez
patent: 6861936 (2005-03-01), Kamath

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