EP0715327A1 - Vorrichtung gegen die Verminderung der Kalibrierung in Folge der Verwendung eines Hilfsschalters - Google Patents

Vorrichtung gegen die Verminderung der Kalibrierung in Folge der Verwendung eines Hilfsschalters Download PDF

Info

Publication number: EP0715327A1
Authority: EP; European Patent Office
Prior art keywords: circuit breaker; thermal; auxiliary; pole; calibration button
Prior art date: 1994-11-28
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Granted

Application number

EP95410119A

Other languages

English (en)

French (fr)

Other versions

EP0715327B1 (de

Inventor

Michel Bonniau

Michel Dell'ova

Didier Lebouc

Jean Caire

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Schneider Electric Industries SAS

Original Assignee

Schneider Electric SE

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1994-11-28

Filing date

1995-10-16

Publication date

1996-06-05

1995-10-16 Application filed by Schneider Electric SE filed Critical Schneider Electric SE

1996-06-05 Publication of EP0715327A1 publication Critical patent/EP0715327A1/de

2001-06-13 Application granted granted Critical

2001-06-13 Publication of EP0715327B1 publication Critical patent/EP0715327B1/de

2015-10-16 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Images

Classifications

- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
- H01H71/7427—Adjusting only the electrothermal mechanism

Definitions

the present invention relates to an anti-derating device of a circuit breaker following the adaptation of an auxiliary such as in particular a differential protection device, this circuit breaker being provided with at least one adjusting screw arranged to perform an initial setting d '' a thermal trip device and define the thermal protection of the circuit breaker corresponding to its rating.
the thermal overload protection is adjusted at the factory, taking into account the temperature rise of the cables as well as the device's own heat dissipation.
This heat dissipation by Joule effect is due to the internal resistances and is evacuated by the external faces in contact with the ambient air as well as by the power cables.
an auxiliary such as for example a differential protection device
the balance of the thermal exchanges of the circuit breaker is modified due in particular to the reduction in the surfaces of exchange with the ambient air, to the modification local at the outlet and through the auxiliary of the conductor sections, of the heat dissipation specific to the auxiliary and of the limitation of the evacuation by the power cables. Because of these changes in balance, the circuit breaker trips earlier in overload and must normally be downgraded in size to continue to provide the protection provided.
the present invention proposes to solve this problem in a simple and effective manner, either automatically or manually.
the anti-derating device is characterized in that it comprises means arranged to perform a new setting of the thermal trigger during the adaptation of the auxiliary.
said means for performing the new setting of the thermal trip device are manual.
they preferably include a thermal calibration button mounted on each pole of the circuit breaker.
said means arranged to perform the new setting of the thermal trip device are automatic.
they preferably comprise at least one actuator integral with the auxiliary and arranged to act on an adjustment bar of the thermal trip device of the circuit breaker.
an auxiliary 10 such as for example a differential protection device, seen from the side, is provided to be fitted to a circuit breaker 11 also shown seen from the side.
the auxiliary is equipped with an actuator 12 arranged to act automatically on a receiving member 13, this receiving member being designed to automatically reset the thermal trip device on each of the poles of the circuit breaker, during the adaptation of the auxiliary to the circuit breaker.
the actuator 12 is constituted by an apparent protuberance on a lateral face of the auxiliary and the receiving member 13 is constituted by a bar for adjusting the thermal trip device, the end of this bar being disposed opposite a window 14 formed in a lateral face of the circuit breaker, in correspondence with said protuberance constituting the actuator 12.
FIG. 2 illustrates, seen in section, a multipole circuit breaker 11 intended to receive an auxiliary 10 equipped with an actuator 12.
the electrical coupling is carried out by means of conductors 15 which extend laterally at the base of the auxiliary and which have bent branches allowing connection to the poles of the circuit breaker.
the thermal trip device 16 comprises bimetallic strips 16a, 16b, 16c and 16d respectively associated with each of the poles of the circuit breaker.
the receiving member 13 is constituted by an adjustment bar 17 at two levels defined by the presence of bosses 17a, 17b, 17c and 17d having a cam function to act on the position of the bimetallic strips 16a, 16b, 16c and 16d.
the bimetallic strips In the initial state corresponding to use of the circuit breaker without an auxiliary, the bimetallic strips occupy a first position, called the low position. In the final state, corresponding to a use of the circuit breaker after adaptation of the auxiliary, the bimetallic strips occupy a second position, called the high position, defined by the bosses 17a, 17b, 17c and 17d.
This second position takes into account the new distribution of heat exchanges due to the addition of the auxiliary. It is obtained by a displacement of the adjustment bar 17, in the direction of arrow A, generated by the thrust exerted by the actuator 12 which enters a window 14 identical to that defined with reference to FIG. 1 and is supported on the end of this bar.
This bar also comprises a support stop 18 of a return spring 19. When the adjustment bar moves from the first to the second position, the spring is compressed. In the event of withdrawal of the auxiliary, the adjustment bar can return to its first position under the action of the return spring 19. In this case, the bimetallic strips resume their so
all the bosses 17a, 17b, 17c and 17d have the same dimensions and in particular the same height.
the new setting of the bimetallic strips when adding an auxiliary is the same for all the poles of the circuit breaker.
the adjustment bar 27 in this case includes bosses 27a, 27b, 27c and 27d which have an increasing height from left to right in the figure.
the new setting of the bimetallic strips 16a, 16b, 16c and 16d is carried out as a function of their distance from the face of the circuit breaker 11 adjacent to the auxiliary 10.
the auxiliary is provided with an actuator 12 which engages in a window 14 arranged in the lateral side of the circuit breaker, opposite the end of the adjustment bar 27.
FIG. 4 illustrates an embodiment according to which it acts on the base or the foot of the bimetallic strips.
a bimetallic strip 30 is mounted on a base 31 which comprises a U-shaped element 32, one branch 32a of which carries an adjusting screw 33 and the other branch 32b of which is linked to the straight active blade 34 of the bimetallic strip.
the central part of the U-shaped element 32 is mounted on a support 35 pivoting on a fixed axis 36 secured to the circuit breaker.
a branch 37, integral with this support is, on the one hand resting on the adjustment bar 38 and, on the other hand pushed against this bar by a spiral spring 39.
the initial adjustment of the setting of the bimetallic strip is carried out at means of the adjusting screw 33 which is engaged in two nuts 40 and 41 arranged on either side of the branch 32a of the U-shaped element 32.
the end of this screw bears against the other branch 32b of this element.
Wedging consists of spreading the two branches appropriately. It makes it possible to adjust the spacing x of the end of the active blade 34 relative to a connecting rod 42 for triggering in the event of overheating.
the action of the adjustment bar 38 consists in acting on the initial spacing x by rotating the base of the bimetal strip on the axis 36.
FIG. 5 illustrates another operating mode according to which the bar acts directly on a trigger rod 50 in the event of overheating and no longer on the bimetallic strip.
the active blade 51 of the bimetallic strip is secured to an angled base 52.
An adjustment screw 53 makes it possible to adjust the initial spacing x 2 of the end of the active blade relative to the rod 50, by modifying the angle of the elbow formed by the bent base 52, one branch of which is secured to the circuit breaker housing and the other branch of which is free.
the adjustment bar 54 acts on the position of the link 50. In the absence of an auxiliary, this link occupies a position shown in solid lines, and the distance between the active blade and the link is x 2 .
FIG. 6 illustrates an embodiment in which the circuit breaker 11 can be associated with two auxiliaries 10a and 10b which each comprise an actuator, respectively 12a and 12b.
the circuit breaker must include two adjustment bars whose effects combine to ensure a new setting of the bimetallic strips taking into account the new conditions of equilibrium of the heat dissipation due to the addition of auxiliaries.
a two-pole circuit breaker 60 is equipped, in a manner known per se, with adjustment screws 61.
the adjustment can be carried out in the factory, or at the end of production, or at the assembly center and delivery, or at the official distributor according to the rules which are known and supplied by the manufacturer.
the action of the screw is mainly, but not exclusively, on the base or foot of the bimetallic strip.
the adjustment screw is of the hollow head type and includes a cavity 62 arranged to receive a manual thermal calibration button 63 represented by FIGS. 8A and 8B.
the button 63 is provided with a protuberance 64 having a grooved surface which corresponds in size and shape to the cavity 62 of the adjustment screw 61, so that this button can be adapted on this adjustment screw.
the front part 65 of the button has a mark, for example an arrow 66 (see FIG. 8A), which occupies an initial position, such as for example represented by FIG. 8A in the absence of an auxiliary and a final position obtained by example by rotating the button a quarter of a turn, as shown in FIG. 9A, when an auxiliary 67 has been adapted to the circuit breaker 60.
a card 68 shown in broken lines, can be adapted over the thermal calibration button, to completely hide it and prevent unauthorized use of this button.
This cover is mounted at the end of the cavity provided in each pole of the circuit breaker and which allows access to the adjustment screw 61 and to the thermal calibration button 63.
this thermal calibration button could be separated from the adjustment screw. In this case, it acts on the bimetallic strip in a zone different from the deformation zone on which the adjusting screw acts.
the calibration button can act either on its active straight branch or on a trigger rod as described with reference to FIG. 5, the position of which is modified by means said button.

Landscapes

Breakers (AREA)
Thermally Actuated Switches (AREA)
Oscillators With Electromechanical Resonators (AREA)
Measuring Fluid Pressure (AREA)
Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
Emergency Protection Circuit Devices (AREA)

EP95410119A 1994-11-28 1995-10-16 Vorrichtung gegen die Verminderung der Kalibrierung in Folge der Verwendung eines Hilfsschalters Expired - Lifetime EP0715327B1 (de)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
FR9414477		1994-11-28
FR9414477A FR2727567B1 (fr)	1994-11-28	1994-11-28	Dispositif anti-declassement en calibre d'un disjoncteur suite a l'adaptation d'un auxiliaire

Publications (2)

Publication Number	Publication Date
EP0715327A1 true EP0715327A1 (de)	1996-06-05
EP0715327B1 EP0715327B1 (de)	2001-06-13

Family

ID=9469394

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP95410119A Expired - Lifetime EP0715327B1 (de)	1994-11-28	1995-10-16	Vorrichtung gegen die Verminderung der Kalibrierung in Folge der Verwendung eines Hilfsschalters

Country Status (7)

Country	Link
EP (1)	EP0715327B1 (de)
CN (1)	CN1055175C (de)
AT (1)	ATE202238T1 (de)
AU (1)	AU691989B2 (de)
DE (1)	DE69521273D1 (de)
FR (1)	FR2727567B1 (de)
RU (1)	RU2107354C1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3831120A (en) *	1973-11-08	1974-08-20	Gen Electric	Trip unit having improved trip adjustment indicator and circuit breaker incorporating same
US3950717A (en) *	1975-02-21	1976-04-13	Westinghouse Electric Corporation	Multi-pole circuit breaker with adjustable thermal trip unit
US4148004A (en) *	1977-05-04	1979-04-03	Westinghouse Electric Corp.	Circuit breaker with calibrating means
EP0338250A2 (de) *	1988-04-19	1989-10-25	ABL SURSUM BAYERISCHE ELEKTROZUBEHÖR GmbH & Co. KG	Mehrphasiger Schutzschalter
EP0375488A1 (de) *	1988-12-23	1990-06-27	Hager Electro S.A.	Gehäuse für modulare elektrische Geräte mit einer Abdeckvorrichtung

1994
- 1994-11-28 FR FR9414477A patent/FR2727567B1/fr not_active Expired - Fee Related
1995
- 1995-10-16 EP EP95410119A patent/EP0715327B1/de not_active Expired - Lifetime
- 1995-10-16 DE DE69521273T patent/DE69521273D1/de not_active Expired - Lifetime
- 1995-10-16 AT AT95410119T patent/ATE202238T1/de not_active IP Right Cessation
- 1995-11-24 AU AU39070/95A patent/AU691989B2/en not_active Ceased
- 1995-11-27 RU RU95120246A patent/RU2107354C1/ru active
- 1995-11-28 CN CN95119789A patent/CN1055175C/zh not_active Expired - Fee Related

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3831120A (en) *	1973-11-08	1974-08-20	Gen Electric	Trip unit having improved trip adjustment indicator and circuit breaker incorporating same
US3950717A (en) *	1975-02-21	1976-04-13	Westinghouse Electric Corporation	Multi-pole circuit breaker with adjustable thermal trip unit
US4148004A (en) *	1977-05-04	1979-04-03	Westinghouse Electric Corp.	Circuit breaker with calibrating means
EP0338250A2 (de) *	1988-04-19	1989-10-25	ABL SURSUM BAYERISCHE ELEKTROZUBEHÖR GmbH & Co. KG	Mehrphasiger Schutzschalter
EP0375488A1 (de) *	1988-12-23	1990-06-27	Hager Electro S.A.	Gehäuse für modulare elektrische Geräte mit einer Abdeckvorrichtung

Also Published As

Publication number	Publication date
EP0715327B1 (de)	2001-06-13
FR2727567B1 (fr)	1997-01-03
AU3907095A (en)	1996-06-06
FR2727567A1 (fr)	1996-05-31
AU691989B2 (en)	1998-05-28
CN1055175C (zh)	2000-08-02
RU2107354C1 (ru)	1998-03-20
ATE202238T1 (de)	2001-06-15
CN1131804A (zh)	1996-09-25
DE69521273D1 (de)	2001-07-19

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FR2553928A1 (fr)	1985-04-26	Bilame a chauffage mixte pour declencheur thermique d'un appareil de coupure
EP0012099B1 (de)	1981-12-30	Schiessscheibenvorrichtung
WO2025016649A1 (fr)	2025-01-23	Disjoncteur thermique
EP0218497A1 (de)	1987-04-15	Schutzschalter mit federnder Lasche
FR2766292A1 (fr)	1999-01-22	Dispositif de commande d'un appareil de protection electrique tel un disjoncteur comprenant un moyen de signalisation du declenchement, et disjoncteur equipe d'un tel dispositif
FR2770335A1 (fr)	1999-04-30	Dispositif de reenclenchement pour disjoncteur, en particulier pour disjoncteur differentiel
EP0615266A1 (de)	1994-09-14	Elektrische Schutzeinrichtung mit thermischen Detektor

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