Method and apparatus of protecting a coating plant against explo

Details Method and apparatus of protecting a coating plant against explo Method and apparatus of protecting a coating plant against explo

1983-06-03

1985-10-08

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

361227, B05B 502

Patent

active

045464006

ABSTRACT:
A method of protecting a plant for coating objects with charged particles as well as a method and apparatus for coating objects is proposed. The generation of an electric arc having a too high energy which can cause an ignition of the particles to be applied onto the object is prevented by applying a test high voltage between the object to be coated and the respective earth connection. An insulation occurring between the object to be coated and the respective earth connection and having a contact resistance smaller than a permitted maximum value is overcome by an arcthrough of lower energy. The current flowing in the closed circuit is measured for determining the contact resistance of the insulation so that the operation of the plant can be stopped when the actual value of the current is below a minimum value as in this case the insulation cannot be overcome by the arcthrough as its contact resistance is higher than the permitted maximum value.

REFERENCES:
patent: Re28394 (1975-04-01), Point
patent: 3970920 (1976-07-01), Braun

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