GB2075290A

GB2075290A - Electronic tripping systems

Info

Publication number: GB2075290A
Application number: GB8102278A
Authority: GB
Original assignee: Felten and Guilleaume Carlswerk AG
Current assignee: Felten and Guilleaume Carlswerk AG
Priority date: 1980-04-29
Filing date: 1981-01-26
Publication date: 1981-11-11
Also published as: DE3016429C2; FR2481513B2; IT1133765B; GB2075290B; IT8025841A0; DE8011640U1; ES8201766A2; DE3016429A1; BE886375R; ES496912A0; DK185781A; FR2481513A2

Abstract

In an electronic circuit-breaker tripping system including a combined rectifier and voltage multiplier circuit, an energy storage device, a pulse generator and a switch which controls the winding of a tripping device (e.g. as described in GB 2037509), the rectifier and voltage multiplier circuit and the pulse generator are grouped together and are arranged in an IC module 30 which is substantially of brick-shape construction and is connected as an integral component member to the casing 25 surrounding the tripping system. Thus, the size of the system can be greatly reduced. <IMAGE>

Description

SPECIFICATION Improvements in or relating to electronic tripping systems The invention relates to an electronic tripping sys tem, for instance for fault current circuit breakers such as earth leakage circuit breakers.

A known electronic tripping system converts stored energy in a capacitor to a short but strong trigger pulse and transfers it suddenly to the coil winding of a trip, such as a relay or circuit breaker. It is desired for the trigger system to consist of only few component elements which can be arranged in a space saving manner in a particularly compact man ner of construction.

According to the invention there is provided an electronic tripping system comprising a combined rectifier and voltage multiplier circuit whose output is connected to an energy storage device for a pulse generator arranged to be controlled by a voltage divider, and a voltage-dependent switching element which is in series with a coil winding of a tripping device and which is arranged to be controlled by the pulse generator, the constructional elements of the rectifier and voltage multiplier circuit and the pulse generator being grouped together and arranged in an IC module which is of substantially brick-shaped configuration and is connected as in integral com ponent part to the cashing which surrounds the trip ping system.

It-is thus possible to provide an electronic tripping system with as many circuit components as possible grouped together and accommodated in a relatively small space with the inclusion of the casing, in order to permit the volume for the associated switch to be maintained as small as possible. Grouping together in an IC module of circuit components permits an extremely space-saving and advantageous accom modation in the casing of the tripping system.

The casing may be directly connected to a holder device for the IC module, and may be divided to permit the insertion of a trip and all the other parts inclusive of the IC module. In a simple case, this hol der device may consist of a pocket which is formed on the casing and which is closable by a cover which may be formed by a casing part. However, the casing parts may be extended in such a manner and the end-side edges are formed on at right angles inwardly that a holder device for the IC module is produced. A U-shaped clamping loop may be used as a part which is independent of the casing, but is connected thereto, and retains the IC module below the casing.Alternatively this part may be a U-shaped detent loop which at two locations enters into a detent connection with the casing and is so con structed that the IC module is retained in the free profile of the detent loop.

The invention will be further described, by way of example, with reference to the accompanying draw ing, in which: Figures la and 1b show a tripping system in a casing with a pocket formed thereon for an IC mod ule, in side view in section and in front view; Figures 2a and 2b show a casing with extended parts which are formed as a holder device for an IC module, in side view and in front view; Figures 3a and 3b shows a casing with an internal arrangement of the IC module in side view and in front view; Figures 4a and 4b shows a U-shaped clamping loop for receiving an IC module, in side view and in front view; and Figures 5a and 5b show a U-shaped detent loop for receiving an IC module, in side view and in front view.

The electronic tripping systems described herein are preferably of the type disclosed in our copending Application No.7931279 (Serial No. 2037509), the disclosure of which is hereby incorporated in the present application.

As shown in Figures 1a and 1b, the parts of a tripping system are accommodated in a casing 25. The parts include a magnetic circuit consisting of a yoke 18 with limbs 19 and 20 and an armature 21, a coil winding 22 arranged around the limb 19 and a permanent magnet 23 at the limb 20. Below the casing, a pocket 31 is formed thereon in which an IC module 30 is arranged which contains the circuit components of an electronic switch for the tripping system.

The associated connecting wires 33 are guided outwards.

The casing is divided at 40 to permit the insertion of all parts of the tripping system.

As shown in Figures 2a and 2b the casing parts may be provided with extensions 34 the ends of which 35 are formed thereon at right angles inwardly so that a holder device is produced for the IC module 30.

As shown in Figures 3a and 3b, it is possible to retain the IC module 30 within the casing. the IC module standing upright and the conductor connections 33 being guided outwards through the wall of the casing.

As shown in Figures 4a and 4b, a separate part in the form of a U-shaped clamping loop is provided which on the one hand engages in the wall of the casing and on the other hand engages underthe IC module 30 by a limb of the loop, so that a secure holder device for the IC module is produced.

As shown in Figures 5a and Sb, the holder device consists of a U-shaped detent loop 37 with one-sided detent bosses 38 which engages in recesses 39 corresponding thereto in the bottom of the casing 25.

1. An electronic tripping system comprising a combined rectifier and voltage multiplier circuit whose output is connected to an energy storage device for a pulse generator arranged to be controlled by a voltage divider, and a voltage-dependent switching element which is in series with a coil winding of a tripping device and which is arranged to be controlled by the pulse generator, the constructional elements of the rectifier and voltage multiplier circuit and the pulse generator being grouped together and arranged in an IC module which is of substantially brick-shaped configuration and is connected as an integral component part to the casing which surrounds the tripping system.

2. An electronic tripping system as claimed in

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in or relating to electronic tripping systems The invention relates to an electronic tripping sys tem, for instance for fault current circuit breakers such as earth leakage circuit breakers. A known electronic tripping system converts stored energy in a capacitor to a short but strong trigger pulse and transfers it suddenly to the coil winding of a trip, such as a relay or circuit breaker. It is desired for the trigger system to consist of only few component elements which can be arranged in a space saving manner in a particularly compact man ner of construction. According to the invention there is provided an electronic tripping system comprising a combined rectifier and voltage multiplier circuit whose output is connected to an energy storage device for a pulse generator arranged to be controlled by a voltage divider, and a voltage-dependent switching element which is in series with a coil winding of a tripping device and which is arranged to be controlled by the pulse generator, the constructional elements of the rectifier and voltage multiplier circuit and the pulse generator being grouped together and arranged in an IC module which is of substantially brick-shaped configuration and is connected as in integral com ponent part to the cashing which surrounds the trip ping system. It-is thus possible to provide an electronic tripping system with as many circuit components as possible grouped together and accommodated in a relatively small space with the inclusion of the casing, in order to permit the volume for the associated switch to be maintained as small as possible. Grouping together in an IC module of circuit components permits an extremely space-saving and advantageous accom modation in the casing of the tripping system. The casing may be directly connected to a holder device for the IC module, and may be divided to permit the insertion of a trip and all the other parts inclusive of the IC module. In a simple case, this hol der device may consist of a pocket which is formed on the casing and which is closable by a cover which may be formed by a casing part. However, the casing parts may be extended in such a manner and the end-side edges are formed on at right angles inwardly that a holder device for the IC module is produced. A U-shaped clamping loop may be used as a part which is independent of the casing, but is connected thereto, and retains the IC module below the casing.Alternatively this part may be a U-shaped detent loop which at two locations enters into a detent connection with the casing and is so con structed that the IC module is retained in the free profile of the detent loop. The invention will be further described, by way of example, with reference to the accompanying draw ing, in which: Figures la and 1b show a tripping system in a casing with a pocket formed thereon for an IC mod ule, in side view in section and in front view; Figures 2a and 2b show a casing with extended parts which are formed as a holder device for an IC module, in side view and in front view; Figures 3a and 3b shows a casing with an internal arrangement of the IC module in side view and in front view; Figures 4a and 4b shows a U-shaped clamping loop for receiving an IC module, in side view and in front view; and Figures 5a and 5b show a U-shaped detent loop for receiving an IC module, in side view and in front view. The electronic tripping systems described herein are preferably of the type disclosed in our copending Application No.7931279 (Serial No. 2037509), the disclosure of which is hereby incorporated in the present application. As shown in Figures 1a and 1b, the parts of a tripping system are accommodated in a casing 25. The parts include a magnetic circuit consisting of a yoke 18 with limbs 19 and 20 and an armature 21, a coil winding 22 arranged around the limb 19 and a permanent magnet 23 at the limb 20. Below the casing, a pocket 31 is formed thereon in which an IC module 30 is arranged which contains the circuit components of an electronic switch for the tripping system. The associated connecting wires 33 are guided outwards. The casing is divided at 40 to permit the insertion of all parts of the tripping system. As shown in Figures 2a and 2b the casing parts may be provided with extensions 34 the ends of which 35 are formed thereon at right angles inwardly so that a holder device is produced for the IC module 30. As shown in Figures 3a and 3b, it is possible to retain the IC module 30 within the casing. the IC module standing upright and the conductor connections 33 being guided outwards through the wall of the casing. As shown in Figures 4a and 4b, a separate part in the form of a U-shaped clamping loop is provided which on the one hand engages in the wall of the casing and on the other hand engages underthe IC module 30 by a limb of the loop, so that a secure holder device for the IC module is produced. As shown in Figures 5a and Sb, the holder device consists of a U-shaped detent loop 37 with one-sided detent bosses 38 which engages in recesses 39 corresponding thereto in the bottom of the casing 25. CLAIMS

2. An electronic tripping system as claimed in claim 11, in which the IC module is arranged in a holder device connected to the casing, the casing being divided.

3. An electronic tripping system as claimed in claim 2, in which the holder device is constructed in the form of a pocket which is formed on the bottom of the casing and corresponds to the dimensions of the IC module, the pocket being closable by a cover.

4. An electronic tripping system as claimed in claim 4, in which the cover is formed by one ofthe casing parts.

5. An electronic tripping system as claimed in claim 1 or 2, in which a or the holder device provides a pocket and is formed by an extension of the casing, the end-side edges of the holder device being extended at right angles inwardly.

6. An electronic tripping system as claimed in claim 1 or 2, in which a or the holder device for the IC module is formed by the bottom and one wall of the casing, the lead connections being guided through the casing wall.

7. An electronic tripping system as claimed in claim 1 or 2, in which a or the holder device is constructed in the form of a U-shaped clamping loop, one limb of which engages in the bottom of the casing and the other limb of which engages under the IC module.

8. An electronic tripping system as claimed in claim 1 or 2, in which a or the holder device is constructed in the form of a U-shaped detent loop with end-face detent bosses which engage in recesses corresponding thereto in the bottom of the casing, the IC module being retained in the free profile of the detent loop.

9. An electronic tripping system substantially as hereinbefore described with reference to and as shown in the accompanying drawings.