Method for the overload protection of devices which cannot endur

Details Method for the overload protection of devices which cannot endur Method for the overload protection of devices which cannot endur

1991-10-02

1994-03-15

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361103, H02H 708

Patent

active

052950344

ABSTRACT:
A method for the overload protection of devices which cannot endure continuous running on account of heat loss, to avoid a complex, cost-intensive direct coupling of the device to be protected to a temperature measuring element. The inside temperature within the housing of the device is merely measured and, on the basis of device-specific characteristics stored in an evaluation circuit, a permissible operating period assigned to the inside temperature is calculated. The permissible operating period is then used as a basis for the preset operating period cycle time.

REFERENCES:
patent: 4547826 (1985-10-01), Premerlani
patent: 4982143 (1991-01-01), Gerschner

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