Protective device for the welding circuit of welding power sourc

Details Protective device for the welding circuit of welding power sourc Protective device for the welding circuit of welding power sourc

1982-12-17

1985-03-26

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 42, H02H 338

Patent

active

045076995

ABSTRACT:
A system to prevent a dangerous contact voltage in a welding apparatus by providing a protective device for cutting off the power for welding. The welding system has a power source including a primary circuit and a secondary circuit. An electrode receiving the power welds workpieces which are successively inserted and removed into electrical contact in the welding system. A protective ground is provided between the housing for the power source and ground. To prevent dangerous grounding during the welding operation, there is connected between the workpiece lead in the secondary and the housing a device which monitors both the current to the protective wire ground and the voltage between the workpiece lead and the housing. This monitor device controls a power cut-off switch. The current is monitored through a current sensor which is connected to the monitor device and the current sensor is also connected in series between the housing and the protective ground. In this way, it is possible to disconnect the power to the electrode when predetermined circuit and voltage limits are exceeded.

REFERENCES:
patent: 3987796 (1976-10-01), Gonser
patent: 4187525 (1980-02-01), Nagura et al.

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