Capacitor switching contactor

Details Capacitor switching contactor Capacitor switching contactor

2000-03-31

2001-09-04

Donovan, Lincoln (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Multiple contact type

C335S202000

Reexamination Certificate

active

06285271

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a capacitor switching contactor which has a standard contactor having main contacts, an auxiliary switch having auxiliary contacts which lead with respect to the main contacts, at least one resistance wire being connected in series each of the auxiliary contacts. The series connection of, in each case, one auxiliary contact and at least one resistance wire is connected on a phase by phase basis, in parallel, to one main contact, respectively. The contactor has input and output terminals for electrically coupling the series connections to the main contacts.
BACKGROUND INFORMATION
Capacitor switching contactors are generally known.
FIG. 6
shows the fundamental electrical circuit of a capacitor switching contactor K. In this context, leading auxiliary contacts VK of an auxiliary switch are connected in parallel with main contacts HK of a standard contactor. The connecting leads from auxiliary contacts VK to main contacts HK are designed as resistance wires having the resistance R
v
. In this context, individual input terminals
1
,
3
,
5
and individual output terminals
2
,
4
,
6
are used to connect the main conductors to the standard contactor and to couple the resistance wires. When a capacitor load
7
is switched in via the capacitor switching contactor according to
FIG. 6
, the leading auxiliary contacts VK of the auxiliary switch are first closed, thereby limiting the short-circuit type current inrush through resistors R
v
in this current path. The main contacts HK are then closed only after a time delay.
Usually, the resistance wires are run loosely in a plurality of loops according to the length required for the resistance value, and the ends are connected to the individual input terminals and individual output terminals.
German Patent No. 31 05 117 describes an electromagnetic switching device having main and leading contacts which are interconnected with damping series resistors in response to capacitive load. On the outgoing circuit side of main and leading contacts
2
and
3
, respectively, resistors
14
are clamped with their ends into the terminals of one main and one leading contact, respectively. The resistors are formed as wire wraps and have an insulated design, and are each located between two dividing ribs of the housing, protected from external influences.
French Patent No. 27 35 279 describes a switching device having a covering, on whose inner side, flat resistance material is laid in a meander form.
Moreover, German Patent No. 92 00 344 describes an attachment housing having components to facilitate mounting on an electrical device having connecting terminals, preferably a contactor. The electrical components are used to interconnect an operating coil. A flexible connecting lead is provided for connecting the components to a coil terminal.
SUMMARY
An object of the present invention is to provide a capacitor switching contactor which is simple in design and renders possible a simple and fast assembly. The objective is achieved by combining the input terminals and the output terminals into one input terminal block and one output terminal block, respectively, having a housing with chambers which are insulated from one another in each case, disposed in which in each case is a connecting terminal that is electrically connected to a resistance wire, which is brought out from the housing of the input terminal block or output terminal block, respectively, to be connected to the auxiliary switch, and whose remaining length is accommodated in the housing.
This facilitates the assembly, since, instead of a plurality of individual input terminals and individual output terminals, terminal blocks may be coupled and connected to the standard contactor. Several not easily manipulable individual parts are replaced by one intrinsically stable connecting block, which, in addition to the connecting terminals, also accommodates the resistance wires. As a result, the resistance wires from the housing of the connecting block can be connected to the auxiliary switch without forming loops, i.e., the need is eliminated for the loops, which are a hindrance during assembly.
It is particularly advantageous for the resistance wire in the housing of the input terminal block or output terminal block to be accommodated in the same chamber as the connecting terminal that is electrically connected to it. In this specific embodiment, the difference in potential between the resistance wire and the connecting terminal electrically connected to it is relatively low in comparison with neighboring connecting terminals. In addition, the electrical stress, thus the probability of a short circuit, is kept at a minimum by the mutual insulation of the chambers. A further advantageous embodiment provides for designing the auxiliary switch, together with the input and output terminal blocks connected thereto via the resistance wires, as a subassembly, which is able to be coupled electrically and mechanically to the standard contactor. A subassembly of this kind is able to be coupled electrically and mechanically to the standard contactor, with little manipulation, i.e. the outlay for assembly is quite minimal. Incorrect connections and wiring are virtually ruled out.
It also proves to be especially expedient for the connecting terminals to be designed with a terminal area for conductor cross sections of up to 70 mm
2
and, in addition, with a terminal for connecting conductor cross sections of up to 2.5 mm
2
, enabling an auxiliary conductor to be connected, in addition to the main conductor.


REFERENCES:
patent: 4539541 (1985-09-01), Bharteey et al.
patent: 4595812 (1986-06-01), Tamaru et al.
patent: 5323132 (1994-06-01), Abot et al.
patent: 5483213 (1996-01-01), Mueller et al.
patent: 5872498 (1999-02-01), Linek
patent: 31 05 117 (1982-08-01), None
patent: 91 00 244 (1992-06-01), None
patent: 2 735 279 (1996-12-01), None
patent: 6-131965 (1994-05-01), None
patent: 6-131963 (1994-05-01), None
patent: 6-131964 (1994-05-01), None

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