Two sensor for over-current protection and current sensing confi

Details Two sensor for over-current protection and current sensing confi Two sensor for over-current protection and current sensing confi

1997-10-17

1999-04-20

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 87, 361 93, 361 23, H02H 504

Patent

active

058962573

ABSTRACT:
An apparatus including only first and second sensors for determining three phase motor currents and providing complete over-current protection to a three phase motor having three input lines. The first and second sensors measure first and second combined currents wherein the first combined current is the current through the first and second lines and the second combined current is at least the current through the second line and at least one of the first or second combined currents include the third current. The first and second combined currents are used to provide the over-current protection and are used to determine all of the first, second and third line currents.

REFERENCES:
patent: 3955121 (1976-05-01), Vahey
patent: 4683513 (1987-07-01), Miller
patent: 4896242 (1990-01-01), Neft
patent: 5705909 (1998-01-01), Rajashekara

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