Title:
APPLIANCE FAULT MONITOR
Document Type and Number:
WIPO Patent Application WO2006004447
Kind Code:
A3
Abstract:
An appliance fault monitor for protecting electrical appliances against fault currents flowing. The alternating current to an appliance load controlled by a phase angle conduction controlled switching device is monitored. The intended non-conduction angle is determined and any current flowing in that angle is indicative of a fault. Repeated indications cause a circuit breaker to disconnect the load.
Inventors:
BUTLER RICHARD GEORGE ARTHUR (NZ)
Application Number:
PCT/NZ2005/000163
Publication Date:
September 08, 2006
Filing Date:
July 06, 2005
Export Citation:
Assignee:
FISHER & PAYKEL APPLIANCES LTD (NZ)
BUTLER RICHARD GEORGE ARTHUR (NZ)
BUTLER RICHARD GEORGE ARTHUR (NZ)
International Classes:
(IPC1-7): G01R31/02; G05B21/00; G05B23/00
Domestic Patent References:
| WO1997014975A1 | 1997-04-24 | |||
| WO1989009456A1 | 1989-10-05 |
Foreign References:
| GB1328664A | 1973-08-30 | |||
| DE4008970A1 | 1991-09-26 | |||
| DE4021559C1 | 1991-12-05 |
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