EP0688464A1 - CURSEUR DE TRANSFERT à LAME ET DEVIATEUR D'ARC POUR DISJONCTEUR A CONTACTS DOUBLES - Google Patents
CURSEUR DE TRANSFERT à LAME ET DEVIATEUR D'ARC POUR DISJONCTEUR A CONTACTS DOUBLESInfo
- Publication number
- EP0688464A1 EP0688464A1 EP95907446A EP95907446A EP0688464A1 EP 0688464 A1 EP0688464 A1 EP 0688464A1 EP 95907446 A EP95907446 A EP 95907446A EP 95907446 A EP95907446 A EP 95907446A EP 0688464 A1 EP0688464 A1 EP 0688464A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- arc
- circuit breaker
- contact assemblies
- current
- pair
- Prior art date
- 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.)
- Withdrawn
Links
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
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/121—Protection of release mechanisms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/18—Means for extinguishing or suppressing arc
Definitions
- the present invention relates generally to circuit breakers and, more particularly, the manner in which a circuit breaker accommodates arc energy developed between two circuit breaker contacts as they separate from one another when the circuit breaker interrupts the current path.
- circuit breakers Use of circuit breakers is widespread in modern-day residential, commercial and industrial electric systems, and they constitute an indispensable component of such systems toward providing protection against over-current conditions.
- Various circuit breaker mechanisms have evolved and have been perfected over time on the basis of application-specific factors such as current capacity, response time, and the type of reset (manual or remote) function desired of the breaker.
- thermo-magnetic tripping device to "trip" a latch in response to a specific range of over-current conditions.
- the tripping action is caused by a significant deflection in a thin bi-metal or thermostat-metal element which responds to changes in temperature due to resistance heating caused by flow of the circuit's electric current through the element.
- the thermostat metal element is typically in the form of a blade and operates in conjunction with a latch so that blade deflection releases the latch after a time delay corresponding to a predetermined over-current threshold in order to "break" the current circuit associated therewith.
- Circuit breaker mechanisms of this type often include an electro-magnet operating upon a lever to release the breaker latch in the presence of a short circuit or very high current condition.
- the thermostat metal element is arranged as part of the same current path that the circuit breaker contacts interrupt in response to the predetermined over-current threshold.
- circuit breaker tripping arrangement is used in both single-break circuit breakers, which have only one set of contacts in the current path, and double- break circuit breakers, which have two sets of contacts in the current path. See, for example, U.S. Patent Nos. 3,944,953, 3,96,346, 3,943,316, 3,943,472, 5,003,139, 5,075,657, and 5,097,589, each of which is assigned to the instant assignee and incorporated herein by reference.
- the present invention provides a circuit breaker arrangement which overcomes the above-mentioned deficiencies of the prior art.
- the present invention provides a combination blade transfer runner and arc shunt, useful for either a double break or single break circuit breaker, which improves the interruption performance of the circuit breaker at low and high level current faults.
- the present invention also provides a solution to a problem discovered by the inventors of the present invention: in higher line voltage applications, low to medium level fault currents cause the arc energy to collapse back into the gap separating the contacts.
- low to medium level fault currents it has been discovered that known implementations using a metal plate next to the arc stack do not aid in interrupting the arc, and the typical arc stack arrangement cannot maintain the arc energy. Consequently, the arc energy collapses back between the contacts, lowers the arc voltage across the contacts, and causes interruption problems at these higher line voltage applications.
- the arrangement of the present invention prevents the arc energy from collapsing from within the arc stack into the adjacent gap which separates the contacts.
- the present invention is realized by providing a circuit breaker a pair of contact assemblies, an arc stack and an arc extractor. At least one of the contact assemblies interrupts the current by moving from a normally closed position to at least one open position, and the arc stack is disposed sufficiently adjacent the pair of contact assemblies to absorb arc energy resulting from one of the primary contact assemblies moving from the normally closed position.
- the arc extractor has a conductive portion located adjacent the arc stack and sufficiently adjacent the pair of contact assemblies to prevent the arc energy within the arc stack from collapsing into a region between the pair of contact assemblies.
- a circuit breaker passes current between two circuit breaker terminals during a normal condition and, in response to at least one abnormal condition, interrupts the current at least momentarily.
- the circuit breaker includes a pair of primary contact assemblies, at least one of which interrupts the current by moving away from a normally closed position; a pair of secondary contact assemblies, at least one of which interrupts the current by moving away from a normally closed position in response to a blow-off force; an arc absorbing element disposed sufficiently adjacent the pair of primary contact assemblies to absorb arc energy resulting from one of the primary contact assemblies moving away from the normally closed position; and an arc extractor having a conductive portion located adjacent the arc stack and within a certain distance with respect to the pair of primary contact assemblies to prevent the arc energy within the arc stack from collapsing into a region between the pair of primary contact assemblies.
- the circuit breaker described in the preceding paragraph is constructed such that the greatest distance between the conductive portion of the arc extractor and the pair of contact assemblies is about 0.25 inch, and the closest distance between the pair of contact assemblies when the contact assemblies are in the open position is between about 0.42 inch and 0.39 inch.
- FIG. 1 is a side view of a double break circuit breaker including an arc extractor embodying principles of the present invention.
- FIG. 2 is an enlarged side view of the arc extractor of FIG. 1.
- FIG. 1 illustrates the basic configuration of a combination blade transfer runner and arc shunt (hereinafter "arc extractor") 10 embodying the present invention in the context of a double-break circuit breaker.
- arc extractor a combination blade transfer runner and arc shunt
- FIG. 1 illustrates the basic configuration of a combination blade transfer runner and arc shunt (hereinafter "arc extractor") 10 embodying the present invention in the context of a double-break circuit breaker.
- the present invention is discussed in the context of such an exemplary double-break circuit breaker for illustrative purposes only, because it was in this environment that the inventors discovered the problem and its solution.
- the particular circuit breaker illustrated and described (FIG. 1) should not be construed to limit the possible applications for the present invention, as these applications encompass a wide variety of circuit breaker types including those serving low level voltage lines and having reduced contact gap separations.
- the circuit breaker of FIG. 1 includes a circuit breaker base 14 which carries all of the internal components of the circuit breaker.
- the current path through the circuit breaker begins at a line terminal 16, and from the line terminal 16 the current path goes through a flexible pigtail 18.
- the flexible pigtail 18 is attached to a secondary blade 20 with a moveable contact 22 mating with a stationary contact 24.
- Current flows through the moveable and stationary contacts 22, 24 to the mid terminal 26, which is configured in an S form.
- the other side of the mid terminal 26 includes another stationary contact 28 connected thereto.
- a mating moveable contact 30 attached to a primary blade 32. Current flows through the stationary and moveable contacts 28, 30, through the primary blade 32, and into one end of a primary flexible connector or pigtail 34.
- the other end of the primary flexible connector 34 is attached to a bimetal 36, which provides the thermal tripping characteristics for the circuit breaker. Finally, the current flows from the bimetal 36 through a load terminal 38 and out of the load end of the circuit breaker via a lug 40.
- the primary section of the circuit breaker includes the primary blade 32, a trip lever 42, a handle 44, a magnetic armature 46, a pigtail 34, and a primary arc stack 13.
- the secondary section includes the secondary blade 20, the pigtail 18, an extension spring 48, and the secondary arc stack 12.
- the primary section provides the breaking capacity for all levels of current from one ampere to approximately 3000 amperes without operational assistance from the secondary section.
- the magnetic armature 46 is drawn to a yoke 50 during high current flow.
- the normal ON and OFF operation of the primary blade 32 occurs in response to rotation of the handle 44 in a clockwise or counterclockwise motion. In response to rotation of the handle 44 in either direction, the primary blade 32 either opens or closes the circuit via the primary moveable contact 30 and the primary stationary contact 28. Rotation of the primary blade 32 is tied directly to the handle 44 for the normal ON and OFF operation of the primary blade 32. Furthermore, the secondary section is not affected by the normal ON and OFF operation of the primary blade 32.
- the secondary blade contact 22 and the secondary stationary contact 24 remain closed.
- the secondary section of the circuit breaker has limited operation below 3000 amperes of fault current. However, at current levels above 3000 amperes, the secondary section begins to contribute to interruption performance.
- the secondary blade 20 derives contact force from the extension spring 48.
- the secondary blade 20 pivots about the blade pivot 52 with the extension spring 48 extended as the secondary blade 20 opens up in response to a current fault above 3000 amperes.
- the constriction resistance of the secondary blade contact 22 and the secondary stationary contact 24 provides a magnetic force that tries to separate the contacts.
- the current path configuration of the mid terminal 26 and the secondary blade 20 forms a magnetic blowoff loop which also tries to separate the contacts 22, 24. The addition of both of these opening forces to the secondary blade
- the 20 causes the secondary blade 20 to separate at the contacts 22, 24.
- the extension spring 48 begins to stretch.
- the extension spring 48 permits the secondary blade 20 to continue to open as long as the force to open the blade is greater than the extension force of the spring 48.
- an arc voltage is generated in the secondary arc stack 12.
- the combination of the arc voltage generated by the secondary arc stack 12 and the arc voltage generated by the primary arc stack 13 make these voltages add together. This allows a very fast rise of arc voltage and also allows high levels of arc voltage consistent with double break circuit breakers.
- the secondary blade 20 As the current fault level rises significantly above 3000 amperes, the faster and higher the secondary blade 20 will be moved. As the interruption takes place and the electric arc is extinguished in the primary and secondary sections, the secondary blade 20 is biased to return to the closed position because of the spring bias from the extension spring 48, and the primary blade is latched in the open position (versus being in the open "OFF" position via the manual handle operation). At this point, the interruption of the current fault is complete with no opportunity to re-establish itself.
- FIG. 2 is an enlarged view of the circuit breaker components highlighting the arc extractor 10 of the present invention.
- the shunt 10 serves both to divert arc energy from the bimetal member 36 and to shunt arc energy from between the contacts.
- the arc extractor 10 serves to shunt arc energy from between the contacts and prevent the energy from collapsing into the gap separating the contacts.
- high level fault currents during the interruption process high levels of current flow through the stationary contact 28 and the moveable contact 30.
- the primary blade 32 blows open counterclockwise about its blade pivot 23. The blade 32 rotates counterclockwise until the back 93 of the blade 32 impacts blade stop 89.
- the generated arc is drawn back between the contacts 28 and 30. Up to this point in time, all the current is passing through the primary current path passing from the flexible connector 34, through the bimetal 36 and the terminal 38, and then out to the lug connection 83.
- the arc transfers some of the current to arc shunt surface 87 so as to generate a secondary shunting current path parallel to the primary current path.
- the current in this secondary path now travels through the body of arc extractor 10 to interface point 88, then travels to load terminal interface point 85. From this point current travels the rest of the way through the final section of the load terminal to lug connection point 83.
- the shunting path of current reduces the total amount of current that goes through the bimetal, thereby reducing the energy stress on the bimetal 36.
- This type of arc shunting practice expands the short circuit capacity of the circuit breaker, which is otherwise limited by the current capacity of the bimetal 36.
- An arc shunt transfer function occurs in response to the application of lower level fault currents to the circuit breaker. This becomes important at the lower level fault currents because at these low levels, the secondary blade 20 does not aid in the current interruption. Instead, the primary blade 32 alone interrupts the current flow.
- the arc transfer system works by first initiating a fault between the contacts 28 and 30. In response to such a fault, the primary blade 32 blows open and pivots about the pivot point 23. The primary blade 32 continues to pivot until it impacts against the blade stop 89. At this point the moveable contact 30 is in close proximity to the transfer tip 90 so that the generated arc can easily jump to the transfer surface 87.
- the arc When the arc engages the transfer surface 87, the arc has a linear travel path from arc runner 54, through the first arc plate 91, up through all the plates to top plate 92, and finally to the transfer surface 87. Once the arc has engaged these components, the arc will not come out of the arc stack and reignite between the stationary contact 28 and the moveable contact 30. By transferring the arc to the transfer surface 87, the interruption quality of the circuit breaker at low level fault currents is improved.
- certain separation distances defined from the tip of the blade 32 in its respective open positions and the end of the conductive arc extractor 10, and defined from the contact 28 to its mating contact 30 in its respective open positions, were found to be acceptable.
- the separation distance should be about 0.25 inch defined from the tip of the blade 32 to the end of the arc extractor 10, and about 0.39 inch and from the contact 28 to its mating contact 30.
- the separation distance should be about 0.08 inch defined from the tip of the blade 32 to the end of the arc extractor 10, and about 0.42 inch and from the contact 28 to its mating contact 30.
- a range of about 0.08 inch to about 0.25 inch is acceptable for the distance between the tip of the blade 32 to the end of the arc extractor 10
- a range of about 0.39 inch to about 0.42 inch is acceptable for the distance between the contact 28 to its mating contact 30.
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
- Breakers (AREA)
Abstract
Disjoncteur à coupure double comportant une paire de contacts, une pile d'arc et un extracteur d'arc. L'un au moins des contacts interrompt le courant en passant d'une position normalement fermée à au moins l'une des positions ouvertes tandis que la pile d'arc est placée suffisamment proche de la paire de contacts pour absorber l'énergie de l'arc produite lorsque l'un des contacts primaires quitte la position normalement fermée. L'extracteur d'arc présente une partie conductrice contiguë à la pile d'arc et suffisamment proche de la paire de contacts pour empêcher l'énergie de l'arc de la pile d'arc de se déverser dans la région située entre les contacts.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18129094A | 1994-01-13 | 1994-01-13 | |
PCT/US1995/000561 WO1995019631A1 (fr) | 1994-01-13 | 1995-01-13 | CURSEUR DE TRANSFERT à LAME ET DEVIATEUR D'ARC POUR DISJONCTEUR A CONTACTS DOUBLES |
US181290 | 1998-10-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0688464A1 true EP0688464A1 (fr) | 1995-12-27 |
Family
ID=22663652
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95907446A Withdrawn EP0688464A1 (fr) | 1994-01-13 | 1995-01-13 | CURSEUR DE TRANSFERT à LAME ET DEVIATEUR D'ARC POUR DISJONCTEUR A CONTACTS DOUBLES |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0688464A1 (fr) |
JP (1) | JPH08507651A (fr) |
CA (1) | CA2156629A1 (fr) |
MX (1) | MX9503935A (fr) |
WO (1) | WO1995019631A1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5864266A (en) * | 1997-12-18 | 1999-01-26 | Square D Company | Reverse deflection prevention arrangement for a bimetal in a circuit breaker |
US6483408B1 (en) * | 2000-10-12 | 2002-11-19 | Eaton Corporation | Circuit breaker with bypass for redirecting high transient current and associated method |
CN100349244C (zh) * | 2004-01-15 | 2007-11-14 | 北京人民电器厂 | 模块化多极双断点塑壳断路器 |
US7796369B2 (en) | 2006-05-01 | 2010-09-14 | Siemens Industry, Inc. | Devices, systems, and methods for shunting a circuit breaker |
US8619395B2 (en) | 2010-03-12 | 2013-12-31 | Arc Suppression Technologies, Llc | Two terminal arc suppressor |
CN105304424A (zh) * | 2015-11-12 | 2016-02-03 | 天津市百利电气有限公司 | 带有半封闭灭弧室的塑料外壳式断路器 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1588513A1 (de) * | 1967-12-19 | 1971-01-21 | Licentia Gmbh | Schaltungsanordnung fuer Selbstschalter in Schmalbauform |
-
1995
- 1995-01-13 WO PCT/US1995/000561 patent/WO1995019631A1/fr not_active Application Discontinuation
- 1995-01-13 MX MX9503935A patent/MX9503935A/es unknown
- 1995-01-13 EP EP95907446A patent/EP0688464A1/fr not_active Withdrawn
- 1995-01-13 JP JP7519158A patent/JPH08507651A/ja active Pending
- 1995-01-13 CA CA 2156629 patent/CA2156629A1/fr not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO9519631A1 * |
Also Published As
Publication number | Publication date |
---|---|
MX9503935A (es) | 1997-12-31 |
CA2156629A1 (fr) | 1995-07-20 |
WO1995019631A1 (fr) | 1995-07-20 |
JPH08507651A (ja) | 1996-08-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19951006 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB IE IT |
|
17Q | First examination report despatched |
Effective date: 19970624 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19970823 |