EP0782757B1 - Dispositif de limitation de puissance pour installation electrique - Google Patents

Dispositif de limitation de puissance pour installation electrique Download PDF

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Publication number
EP0782757B1
EP0782757B1 EP95932038A EP95932038A EP0782757B1 EP 0782757 B1 EP0782757 B1 EP 0782757B1 EP 95932038 A EP95932038 A EP 95932038A EP 95932038 A EP95932038 A EP 95932038A EP 0782757 B1 EP0782757 B1 EP 0782757B1
Authority
EP
European Patent Office
Prior art keywords
current
switch
threshold value
ampères
casing
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.)
Expired - Lifetime
Application number
EP95932038A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0782757A1 (fr
Inventor
Yves Maucherat
Louis Sieberras
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.)
Electricite de France SA
Original Assignee
Electricite de France SA
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.)
Filing date
Publication date
Application filed by Electricite de France SA filed Critical Electricite de France SA
Publication of EP0782757A1 publication Critical patent/EP0782757A1/fr
Application granted granted Critical
Publication of EP0782757B1 publication Critical patent/EP0782757B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/10—Adaptation for built-in fuses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H81/00—Protective switches in which contacts are normally closed but are repeatedly opened and reclosed as long as a condition causing excess current persists, e.g. for current limiting
    • H01H81/02—Protective switches in which contacts are normally closed but are repeatedly opened and reclosed as long as a condition causing excess current persists, e.g. for current limiting electrothermally operated

Definitions

  • the present invention relates to a device of power limitation as defined in the preamble of claim 1, intended to limit the power delivered to an electrical installation.
  • Such a device makes it possible to disconnect the installation. located downstream of it as soon as a predetermined intensity threshold is reached.
  • Such devices allow for example to offer a client an alternative solution to a suspension of electric power supply in case of non-payment of energy bills, by limiting its consumption.
  • a circuit breaker for limiting power set at low intensity can be installed in a home instead of a conventional circuit breaker.
  • Such a power limiting circuit breaker is of a easy to use because it can be reset by the customer after tripping, but has the disadvantage to require complex assembly.
  • a fuse with a normal intensity determined according to the limitation chosen and placed in a location not accessible by the customer.
  • Such a fuse is very easy to mount but has the disadvantage of causing a final cut of the power supply if the threshold is exceeded intensity.
  • the present invention aims to overcome the drawbacks cited by proposing a device for limiting power according to claim 1 making it possible to limit the consumption of a electrical installation and protect that installation against large and sudden increases in current.
  • a limitation device power for electrical installation which includes, mounted in series in a housing common between two connection terminals of this box to said installation, first means of limiting current, automatically resettable, suitable for intervene when the intensity of the supply current of said installation reaches a first value of threshold corresponding to the maximum value of the intensity of the current authorized to circulate in said installation and second non-resettable power cut means, having a lower response time than first means of current limitation and suitable for intervene when the instantaneous value of the current supply reaches a second upper threshold value at said first threshold value.
  • the first current limiting means include a thermal resistance switch.
  • the switch comprises, in an envelope of insulating material, a movable contact, a fixed contact and a related actuator heat exchange with thermal resistance and cooperating with the movable contact so as to move it between a closed current flow position in which the moving contact is based on the fixed contact and an open current limiting position.
  • the movable contact and the fixed contact respectively comprise a conductive strip and a contact tab, each fixed by one of their ends on a support and leaning on each other in the closed position by their free end, and the actuator comprises a snap action bimetal attached to its area median on a lug formed on the support.
  • the switch includes first and second pins of conductive material passing through one end of the envelope and being respectively extended inside the envelope by the blade conductive and through the contact tab, the second pin being folded from said end towards a opposite end of the envelope and comprising a member mechanical connection and electrical connection with second power cut means, the first pin passing through an opening in a connection terminal of the housing with the installation.
  • the second cutting means current have a fuse fitted with two end caps connection, one of its end pieces being connected to the mechanical connection and electrical connection of the switch, the other end piece passing through an orifice made in a connection terminal of the box with the installation.
  • the power limiting device 10 is intended to be installed on the power supply network upstream of an electrical installation, such as an installation house, so as to limit the power supplied to it.
  • This device 10 comprises first means of current limitation 12 and second breaking means current 14.
  • the first means 12 of current limitation and the second means 14 for cutting the current are arranged in series and placed in a common box 16, fictitiously broken in this figure 1, preferably having dimensions identical to those of a conventional fuse.
  • the housing 16 comprises a cylindrical body 18, in ceramic, surrounding the first limiting means 12 current and the second means 14 for cutting off current.
  • the cylindrical body 18 is provided at each of its ends of two connection terminals 20 and 22 of the housing 16 with the installation, connected respectively to the first current limiting means 12 and to the second means 14 for cutting the current.
  • the terminals 20 and 22 are crimped hot on the body 18 of the case 16.
  • each connection terminal 20 and 22 of the housing 16 is provided with an axial orifice, respectively 24 and 26, formed in its end wall.
  • the first means 12 of current limitation have a substantially parallelepipedic envelope 28 in insulating material, such as a plastic material, in which is arranged a switch, which will be described with reference to Figures 2 and 3.
  • the casing 28 is provided on one of its ends 30 of a first and a second pin 32.34 made of through conductive material the casing 28 and each connected to the switch.
  • the free end of the second pin 34 is folded over and extends from the end 30 of the casing 28 towards an opposite end 38, shown dotted, at which this pin 34 includes a mechanical connection and connection member electric consisting of a cylindrical socket 40 intended to cooperate with the second cutting means 14 current.
  • the second means 14 of power cut have a fuse constituted in a known manner by a wire of alloy, not shown, enclosed in a cartridge 42 cylindrical ceramic and whose ends are connected to two connection end pieces 44 and 46, made of material conductor, closing each end of the cartridge 42.
  • the fuse constituting the second means of cutting the current is a fuse of which the breaking capacity is above 20,000 amperes and whose nominal intensity is between 5 and 20 amps, preferably 10 amps.
  • connection end piece 44 passes through the orifice 26, of the connection terminal 22 of the housing 16 so as to make an electrical connection between this terminal 22 of the box 16 and the fuse.
  • the first current limiting means 12 include a switch, with the general reference 48.
  • the switch 48 has a movable contact, consisting of a conductive blade 50, a fixed contact, consisting of a lug contact 52 and an actuator constituted by a snap action bimetal 54, fixed on a support 56.
  • This switch 48 is disposed in the casing 28, such so that the conductive strip 50 and the bimetallic strip 54 are in heat exchange relationship.
  • the conductive strip 50 of substantially shaped straight, is formed by a thermal resistance. It is fixed by one of its ends on the first pin 32 and on the support 56 via a copper rivet 58. The other end of the conductive strip 50 carries a contact pad and cooperates with a free end of the contact lug 52, the other of which end is fixed on the second pin 34 and on the support 56 via a second copper rivet 60.
  • the second pin 34 has a folded part 62 extending by a straight part 64 and by the socket 40 for receiving the end piece connection 46 of fuse 14.
  • the support 56 includes a lug 66 on which the bimetallic strip 54 is fixed by means of its middle part.
  • Bimetal 54 has an elongated profile shape substantially concave, whose concavity is turned towards the support 56 in the closed position for passage of current (figure 2), and whose concavity is turned towards the conductive strip 50 in the open limiting position current (Figure 3), in which both ends 68 and 70 of bimetallic strip 54 cooperate respectively with two projections 72 and 74 provided on the face of the conductive strip 50 placed opposite the bimetallic strip 54 so as to spread the free end of this blade 50 from the tab of contact 52 by deformation of the blade 50.
  • the power limiting device 10 described above is arranged upstream of the installation electric home instead of a fuse classic, preferably in an inaccessible location by the customer.
  • the current supplied by the network therefore flows in the first means 12 of current limitation and in the second means 14 for cutting the current.
  • the switch 48 When the value of the intensity traversing the conductive strip 50 reaches a first threshold value, fixed for example as was mentioned above at 5 amps, after a response time due to the time lapse necessary for thermal resistance and bimetal 54 heats up, the switch 48 suddenly goes from its closed current flow position to its position open current interruption due to change abrupt concavity of the bimetallic strip 54. In position open, the concavity of the bimetallic strip 54 is turned towards the blade 50 and the ends 68 and 70 of the bimetallic strip 54 repel the projections 72 and 74 of the blade 50. Therefore, the blade 50 is deformed and its free end deviates from the tab contact 52 which causes a power outage.
  • a first threshold value fixed for example as was mentioned above at 5 amps
  • the conductive strip 50 is no longer traversed by a current, the thermal resistance and the bimetallic strip 54 cool.
  • bimetallic strip 54 After a second response time due to the lapse of time required for thermal resistance and bimetallic strip 54 cool, bimetallic strip 54 returns to its initial position and its ends 68 and 70 deviate from the blade 50 which then returns to its initial position. The current therefore flows back into the device and the power supply to the electrical installation is again assured, the free end of the conductive strip 50 resting on the contact tab 52.
  • the response times required respectively for the transition from the closed position to the open position and open position to position closed are determined by choosing appropriately the materials constituting the thermal resistance and of the bimetallic strip.
  • opening response times and at closing are equal and are approximately 1 min.
  • the device which has been described therefore makes it possible to limit the power supplied to an electrical installation at a predetermined threshold value, while allowing a exceeding this threshold for a very short time, but by protecting this installation against short-circuits.
  • this device is of a very mounting easy and can therefore easily be installed at a customer's, in the event that he has not paid his invoices energy, replacing a conventional fuse, or be easily replaced with a conventional fuse after the customer has paid their debts.
  • the first current limiting means and the second power cut means may include a body in the shape of a rectangular parallelepiped provided at the level of each of its end faces with a knife electric contact.

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Fuses (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Crushing And Grinding (AREA)
  • Thermally Actuated Switches (AREA)
EP95932038A 1994-09-22 1995-09-21 Dispositif de limitation de puissance pour installation electrique Expired - Lifetime EP0782757B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9411328A FR2725082A1 (fr) 1994-09-22 1994-09-22 Dispositif de limitation de puissance pour installation electrique
FR9411328 1994-09-22
PCT/FR1995/001216 WO1996009634A1 (fr) 1994-09-22 1995-09-21 Dispositif de limitation de puissance pour installation electrique

Publications (2)

Publication Number Publication Date
EP0782757A1 EP0782757A1 (fr) 1997-07-09
EP0782757B1 true EP0782757B1 (fr) 1998-04-08

Family

ID=9467179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95932038A Expired - Lifetime EP0782757B1 (fr) 1994-09-22 1995-09-21 Dispositif de limitation de puissance pour installation electrique

Country Status (7)

Country Link
EP (1) EP0782757B1 (enrdf_load_stackoverflow)
AT (1) ATE164965T1 (enrdf_load_stackoverflow)
BR (1) BR9509174A (enrdf_load_stackoverflow)
DE (1) DE69502026T2 (enrdf_load_stackoverflow)
ES (1) ES2118621T3 (enrdf_load_stackoverflow)
FR (1) FR2725082A1 (enrdf_load_stackoverflow)
WO (1) WO1996009634A1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2815484B1 (fr) * 2000-10-13 2002-12-20 Electricite De France Limiteur de puissance electrique consomme dans une installation
DE10238481B4 (de) * 2002-08-22 2005-12-08 Wieland Electric Gmbh Sicherungseinsatzträger

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2074400A (en) * 1935-04-24 1937-03-23 Indicating Fuse Mfg Corp Dual fuse with indicator
US2240239A (en) * 1938-10-10 1941-04-29 Herbert E Brannon Electric fuse
US2277619A (en) * 1939-12-28 1942-03-24 Westinghouse Electric & Mfg Co Circuit interrupter
US2299728A (en) * 1940-02-15 1942-10-27 Herbert E Brannon Electric circuit breaker
DE3539425A1 (de) * 1985-11-07 1987-05-14 Limitor Ag Thermobimetallschalter
JPS62268030A (ja) * 1986-05-15 1987-11-20 東部電気株式会社 プロテクタ−

Also Published As

Publication number Publication date
BR9509174A (pt) 1997-11-25
EP0782757A1 (fr) 1997-07-09
ATE164965T1 (de) 1998-04-15
ES2118621T3 (es) 1998-09-16
DE69502026D1 (de) 1998-05-14
DE69502026T2 (de) 1998-10-08
FR2725082B1 (enrdf_load_stackoverflow) 1997-02-07
WO1996009634A1 (fr) 1996-03-28
FR2725082A1 (fr) 1996-03-29

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