Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – With housing or support means
Reexamination Certificate
2000-01-28
2001-01-16
Donovan, Lincoln (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
With housing or support means
C335S018000, C335S132000
Reexamination Certificate
active
06175289
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to an electronic trip device comprising a case, an electronic processing circuit located inside the case, connection means for connecting the processing circuit to conductors of a power system to be protected, means for determining tripping parameters comprising a removable module, means for fixing the removable module on a front panel of the case, the removable module coming into contact, in the fixed position, with the processing circuit. The use of a removable module for determining long delay protection parameters is conventional in electronic trip devices. Some trip devices comprise a processing circuit directly connected to conductors of a power system to be protected, so as to enable voltage measurement, for example by means of a resistive dividing bridge. This direct connection, without a transformer, must be able to be interrupted, in particular to carry out dielectric isolation tests. In certain protection apparatuses a removable device is provided located on the front panel which, when it is removed, interrupts the voltage connection.
SUMMARY OF THE INVENTION
The object of the invention is to achieve a trip device in which these two functions are performed in simple and dependable manner.
According to the invention, this object is achieved by the fact that the connection means comprise, inside the case, a movable part movable between a connected position and a disconnected position and comprising flexible contacts achieving, in the connected position, a contact between first contact points of a printed circuit, connected to the power system conductors, and second contact points of the printed circuit forming voltage inputs of the processing circuit, the connection means comprising spring means urging the movable part to the disconnected position, the removable module, in the fixed position, urging the movable part to the connected position against the action of the spring means. Said part can be movable in rotation or in translation.
According to a first development of the invention the part is movable in rotation and comprises rotation pins having an end of rectangular cross-section, internal faces of side walls of the case comprising associated guide elements each bounding a narrow rectangular passage and a circular space.
According to another development of the invention the case comprises a guide rib on an internal face of at least one side wall of the case, the removable module comprising lateral lugs coming into contact with one end of an auxiliary part, the auxiliary part being in contact with the movable part and guided by the guide rib.
According to another development of the invention the processing circuit comprises at least a first printed circuit board, located in the case near to the front panel and comprising terminals designed to come into contact with associated contacts of the removable module, and a second printed circuit board, located in a laid back position with respect to the front panel and comprising the first and second contact points, the movable part being interposed between the second printed circuit board and the front panel.
REFERENCES:
patent: 4181906 (1980-01-01), Matsko et al.
patent: 5264811 (1993-11-01), Takeda
patent: 5450048 (1995-09-01), Leger et al.
patent: 298 14 467 [0 U (1998-11-01), None
patent: 0320409 (1989-06-01), None
patent: 0611224 (1994-08-01), None
Donovan Lincoln
Parkhurst & Wendel LLP
Square D Company
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