Inductor devices – Winding formed of plural coils
Patent
1986-12-12
1988-10-11
Kozma, Thomas J.
Inductor devices
Winding formed of plural coils
336182, 336195, 336212, 336DIG2, H01F 2728
Patent
active
047774665
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In underwater installations as for example in association with offshore oil activity, the interconnection between cables or between cables and equipment modules, for example located at the sea bottom, presents serious problems. A specific type of inductive connector is described in Norwegian Patent Application No. 84.0087. The present invention takes as a basis a situation corresponding to that in such previous disclosure, but as will appear from the following, the present invention has also in part more general uses.
Corrosion and pitting of materials included in the structure of such connectors or the like constitute one of the greatest problems in underwater installations in sea water and also frequently at other forms of electrical installations in which it cannot always be guaranteed that corrosion protection and encapsulation will prevent penetration of for example water or moisture. In particular when there is ambient sea water it is to be noted that the voltage level in a part of the electrical installation has much significance to the corrosion rate. When the voltages exceed about 1 volt, the corrosion will take place much more quickly than at lower voltages. This recognition constitutes some of the background for the solutions set forth in the following.
When transmitting and distributing electrical energy and signals respectively through cables and wires there will normally be employed much higher voltage levels than 1 volt, depending upon the transmission distances concerned. This also applies to a high degree in underwater installations in offshore oil activity.
SUMMARY OF THE INVENTION
Thus, this invention, in a first aspect which is rather fundamental, relates to a connector arrangement for electrical circuits in underwater installations, comprising two connector parts adapted for mutually separable interconnection, preferably by inductive coupling. What is novel and specific to the arrangement according to the invention is that associated with at least one of the connector parts there is provided a transformer for transforming between a comparatively low voltage level over the connector and a comparatively high voltage level in an adjacent electrical circuit, for example a transmission cable. An advantageous embodiment in practice is obtained by assembling these coupling transformers with the connector into an integrated unit.
Depending upon the electrical circuit in which the connector is included, it may be necessary to have a transformer at both sides or only at one side of the connector. Two-sided transformation will be the more normal, for example when the interconnection of two lengths of a transmission cable is concerned. Moreover, there may be situations in which the voltage level in the system is so high that stepdown transforming to a low level across the connector must be effected by means of two or more transformers in series, as individual transformers in practical designs will have limitations with respect to the maximum conversion rate.
The present arrangement with the so-called coupling transformers imposes quite specific requirements to the transformer design. Another and essential aspect of this invention thus relates to a transformer suitable for this purpose. It will be realized, however, that the transformer to be described in the following can also be employed with advantage in other areas than in underwater installations as discussed above.
In this aspect the invention takes as a basis a transformer for current supply and/or signalling purposes, in particular for use in an arrangement comprising a magnetic circuit, a first winding having a plurality of turns and a second winding having one or very few turns, in which turn portions of both windings pass substantially in parallel through one or more openings in the magnetic circuit. What is novel and specific to the transformer according to the invention is that the turn portions of the first winding along a major part of its length surrounded by the magnetic circuit are individually encl
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Kozma Thomas J.
Senter for Industriforskning
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