Electricity: electrical systems and devices – Safety and protection of systems and devices – Feeder protection in distribution networks
Patent
1993-05-21
1995-05-02
Hoff, Marc S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Feeder protection in distribution networks
361 64, 361115, H02J 1300
Patent
active
054125286
ABSTRACT:
A safety disconnect system for an installation comprising machines which are designed to interact, has a machine disconnect level in which a dedicated disconnect circuit is allocated to each machine, an area disconnect level, in which disconnect areas which comprise groups of associated machines can be disconnected, and a system disconnect level which is allocated to all the machines of the installation. The disconnect circuits in each case have an electrically operable switching element which is connected via safety circuits to a main box for the central control of the safety disconnect system and, through this box, to a power supply. The safety circuits have operable tripping elements at the area disconnect level and at the system disconnect level, are constructed as latching circuits and are passed through the main box in which they can optionally be linked to one another by means of a switching matrix such that groups of associated machines are disconnected if one of the tripping elements is operated. In order to connect an additional machine to the safety disconnect system, it is necessary only to connect the disconnection circuit of this machine to the main box via an additional latching circuit. The wiring of the installation does not otherwise need to be modified, since the linking of the additional machine to the safety disconnect system takes place in the switching matrix of the main box.
REFERENCES:
patent: 4090088 (1978-05-01), McMahon et al.
Mannheim, Peter Raimund, "Method For Increasing the Availability and Reliability in Operation of Large Rolling Mills," BBC-Nachrichten [Brown, Boveri & Cie News], 1976, Issue 2/3.
Extract from: DER POLYGRAPH Issue 17-86, "Innovative Control Systems For Fully Automated Printing Machines".
Bovenzi Giorgio
Emmenegger Robert
Mader Carl C.
Ferag AG
Hoff Marc S.
Jackson S.
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