US2745992A

US2745992A - Electric switching apparatus for high tension

Info

Publication number: US2745992A
Application number: US451586A
Authority: US
Inventors: Hendrik A Hidde
Original assignee: COQ NV
Current assignee: COQ NV
Priority date: 1953-08-24
Filing date: 1954-08-23
Publication date: 1956-05-15
Anticipated expiration: 1973-05-15
Also published as: FR1083349A; NL80995C; GB753639A

Description

May 15, 1956 H. A. HlDDE NlJLAND 2,745,992

ELECTRIC SWITCHING APPARATUS FOR HIGH TENSION 2 Sheets-Sheet 1 Filed Aug. 23, 1954 M y 5, 1956 H. A. HlDDE NIJLAND 2,745,992

ELECTRIC SWITCHING APPARATUS FOR HIGH TENSION 2 Sheets-Sheet 2 Filed Aug. 25, 1954 w/ I Z 1 r :1 i, 4 :1 5 iii/141 N .ill l |||\|1 I v wh. 4 r 2 M 2 7 1| FVI r111 V v 5 3 6 2 1 2 4 2 7 0 1 m a 2 W I u m m :1 4 5 I. I 3 J ll N l i u :3--. II. l m w A I? I I! la 0 6 8 & 2 2

PIC-3.2

the annular core in a plurality of turns, so that the primary winding of the transformer is of the multiturn type.

' Q United States Patent ce 2745992 Patented May 15, 1956 For the purpose of illustration, reference is had to the 2,745,992 drawing, in which:

1 i Fig. l is a somewhat diagrammatic elevation, partly in ELECTRIC S FOR HIGH section, of a switch or circuit breaker in accordance with 5 the invention, the switching element thereof being partly Hendrik A. .Hidde Nijland, Laren, Netherlands, assignor m d fr m th Casing, and

to N. V. COQ, Utrecht, Netherlands, a company of Fig. 2 is a vertical section, drawn to a larger scale, of the Netherlands that part of the switching element, which is essential as far as the invention isconcerned. Apphcatwn August 1954 Sena! 451586 In the drawing, 1 designates a metal casing which dur- Claims priority, application Netherlands August 24, 1953 ing operation of the apparatus is filled with mineral oil. Projecting into said casing and insulatedly passed through 6 Claims (CL 317 157'6) the wall thereof are lead-in conductors, whose pin-shaped terminals are indicated by 2 and 3, respectively. Said The invention relates to electric switching or circuitconductors are connected to a system of busbars (not breaking apparatus for high tension, of the known type shown) accommodated in a box 4, and to a cable 5, comprising in combination: respectively.

A stationary metal casing provided with a detachable Detachably mounted in the casing is a composite switchcover and with leading-in conductors insulatedly passed ing element suspended from the cover plate 6 of the casthrough its wall, said casing being filled, or adapted to ing 1. This element is composed of two sections, the be filled, with an insulating fluid such as mineral oil, and first comprising: a vertical, insulating tube 7 accommodatat least one composite switching element secured to said ing a switching contact 8, an axially movable, pin-shaped cover and comprising a stationary switching contact, a switching contact 9 cooperating therewith, and a conmovable switching contact adapted to cooperate therenecting contact 10 connected to the switching contact 8 with, two connecting contacts electrically connected with and adapted to cooperate with the terminal 2, the second the said switching contacts, respectively, and a current section comprising: two vertical, insulating tubular memtransformer electrically inserted intermediate one of said

bers

11, 12, two transverse,

insulating tubes

13, 14 interswitching contacts and one of said connecting contacts, connecting said tubular members, a second connecting said connecting contacts cooperating with terminals procontact 15 adapted to cooperate with the terminal 3, and a vided on the leading-in conductors so as to permit the current transformer comprising a primary winding 16, switching element to be bodily removed from, and be an annular magnetic core 17 and a secondary winding 18. positioned in, said casing Whilst the leading-in conductors The

tubular members

11, 12 are secured to a plate 19 are alive. which, by means of bolts 20 and spacer sleeves 21, is

In known switching apparatus of this type, the switchdetachably secured to the cover plate 6 and disposed in ing element has to be dismantled almost entirely when a 31 parallel relation therewith. The movable switching concurrent transformer of difierent capacity or of dilferent tact 9 is in permanent sliding contact with a connecting class has to be provided. In addition, it is not well possible contact 22 provided with a connecting block 23, which with said apparatus to provide a current transformer projects from the tubular member 7 into the tubular memwhose primary winding comprises more than one turn. ber 12 through a suitable opening thereof. Secured to The invention has for its object to avoid said disadvan- 49 said block 23 as by a bolt 24 is a conducting strip 25, tages of the known constructions. It consists herein that which is also connected to the second connecting contact the, or each, composite switching element is composed of 15 and is passed in a plurality of turns through the transtwo sections electrically interconnected by readily

sepverse tubes

13, 14, so as to also constitute a multiturn arable members, the first section comprising the switching primary winding of the current transformer. The magcontacts and one connecting contact, the second section netic core 17 and the secondary transformer winding 18 comprising the current transformer and the second conare disposed around the transverse tube 13. necting contact, said second section being secured to the Each

tubular member

11, 12 is provided with an axial cover so as to be bodily removable therefrom. With this

slot

26, 27, respectively. These slots enable the proper construction, the second section can be readily replaced positioning of the primary winding 16 of the current by a similar section comprising a difierent current trans- KO transformer after the tubular members 11', 12 and the former, without it being necessary for the switch proper

transverse tubes

13, 14 have been assembled and secured to be dismantled. to the plate 19. After the primary winding 16 has been referably, the second section of the switching element, so positioned, the

slots

26, 27 are closed by slotted, insui. e. the section which comprises the current transformer lating

partial sleeves

28 and 29, respectively, slidably and the second connecting contact, will be composed of mounted on the

tubular members

11 and 12, respectively. a plate member detachably connected to the cover and The cooperation of the connecting

contacts

10, 15 with disposed in parallel relation therewith, two insulating the

terminals

2, 3 is such that, after removal of the cover tubular members connected to said plate member, one of 6, the entire composite switching lenient can be lifted out these tubular members accommodating the connecting of the casing 1, whilst the

terminals

2, 3 remain alive. contact and the other accommodating the member for Should it now be desired for another current transformer, electrically interconnecting both sections of the switching having a different capacity or being of another class, to element, at least one transverse, insulating tube interconbe fitted, all that is necessary is: removing the entire necting said tubular members, through which tube passes switching element from the casing 1, unscrewing the bolts the conductor interconnecting the connecting contact and 20 and 24, whereby that section of said element which the said connecting member, and at least one annular r comprises the current transformer is bodily disconnected magnetic core surrounding the said transverse tube and from the cover and from the other section of the switching enclosed by the secondary winding of the transformer. element, and securing a similar section comprising another If the second Section comprises at least two transverse current transformer both to the cover 6 and to the block tubes, the conductor interconnecting the connecting con- 23, whereupon the switching element can again be intact and the connecting member may be passed through serted into the casing.

What I claim is: 1. An electric circuit breaker for high tension, comprising a stationary metal casing adapted to be filled with an insulating fluid, a cover detachably mounted on said casing, leading-in conductors insulatedly passing through the walls of the casing, a switching element composed, of two individual sections suspended from and independently attached to said cover and located in said casing, a first one of said sections including a current transformer, readily separable members, one of which is mounted on one of the sections, electrically interconnecting the two sections of the switching element, means for attaching the first section to the cover for ready removal therefrom after it has been removed from the casing, and a pair of cooperating plug and bushing contacts between the leading-in conductors and the respective sections of the switching element, said plug and bushing contacts permitting the cover together with the two sections of the switching element to be bodily removed from the casing and disconnected from the conductors while the leading-in conductors are energized.

2. An electric circuit-breaker in accordance with claim 1, in which there are cooperating switching contacts on one of the sections, one of said switching contacts being directly electrically connected to one of the readily separable members which is mounted on said one section and the other of said switching contacts being a part of the member of the plug and bushing contact which is mounted on said one section.

3. An electric circuit-breaker in accordance with claim 2; in which the first section of the switching element comprises a plate member detachably secured to the cover and disposed in parallel relation therewith, two insulating tubular members secured to said plate, one of said tubular members housing and supporting one of said contacts of one of the pairs of plug and bushing contacts and the other supporting one of the said readily separable conductive members for electrically interconnecting both sections of the switching element, at least one insulating transverse tube interconnecting the two tubular members, a further conductor interconnecting said contact and said conductive member and passing through said transverse tube, at

least one annular magnetic core surrounding said transverse tube and a secondary winding enclosing said core, said interconnecting conductor, said core, and said winding constituting together the said current transformer.

4. An electric circuit-breaker in accordance with claim 2, in which the first section of the switching element comprises a plate member detachably secured to the cover and disposed in parallel relation therewith, two insulating tubular members secured to said plate, one of said tubular members housing and supporting one of said contacts of one of the pairs of plug and bushing contacts and the other supporting one of the said readily separable conductive members for electrically interconnecting both sections of the switching element, at least two insulating transverse tubes interconnecting said contact and said conductive member and passing at least twice through one transverse tube and at least once through the other transverse tube, at least one annular magnetic core surrounding the first mentioned transverse tube and a secondary winding enclosing said core, said interconnecting conductor, said core, and said winding constituting together the said current transformer.

5. An electric circuit-breaker in accordance with claim 2, in which the first section of the switching element comprises a plate member detachably secured to the cover and disposed in parallel relation therewith, two insulating tubular members secured to said plate, one of said tubular members housing and supporting one of said contacts of one of the pairs of plug and bushing contacts and the other supporting one of the said readily separable conductive members for electrically interconnecting both sections or" the switching element, at least two insulating transverse tubes interconnecting the two tubular members, said transverse tubes extending into fitting apertures of the tubular members, a further conductor interconnecting said contact and said conductive member and passing at least twice through one transverse tube and at least once through the other transverse tube, slots being provided in said tubular members opposite said apertures and permitting said interconnecting conductor to be properly positioned after the insulating tubular members and transverse tubes have been assembled to a unit, at least one annular magnetic core surrounding the first mentioned transverse tube and a secondary winding enclosing said core, said interconnecting conductor, said core, and said winding constituting together the said current transformer.

6. An electric circuit breaker in accordance with claim 2, having an insulating tubular member housing the cooperating switching contacts and one of the contact of one of the pairs of plug and bushing contacts and supporting one of the said readily separable conductive members for electrically interconnecting both sections of the switching element, a plate member detachably secured to the cover and disposed in parailel relation therewith, two insulating tubular members secured to said plate, one of said tubular members housing and supporting one of said contacts of one of the pairs of plug and bushing contacts and the other supporting the other one of the said readily separable conductive members, at least one insulating transverse tube interconnecting the latter two tubular members, a further conductor interconnecting said latter contact and said other conductive member and passing through said transverse tube, at least one annular magnetic core surrounding said transverse tube and a secondary winding enclosing said core, said interconnecting conductor, said core and said winding constituting together the said current transformer, and all three tubular members having their axes lying parallel to each other and contained in the same plane perpendicula to said cover and said plate. 1

References Cited in the file of this patent UNITED STATES PATENTS