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
  • H01H71/123—Automatic release mechanisms with or without manual release using a solid-state trip unit
  • H01H71/125—Automatic release mechanisms with or without manual release using a solid-state trip unit characterised by sensing elements, e.g. current transformers

Definitions

• the invention relates to an electronic trip device for a multipolar electric line protection device, of the circuit breaker type.
• an electronic trip unit detects overload currents and short-circuit currents to open the circuit breaker contacts.
• an electronic release is to be able to have a wide range of settings, including the trigger level and the trigger time. It usually consists of an actuator controlled by an electronic card that monitors the current that passes through the circuit breaker via sensors.
• the electronic release is associated with a cutoff block containing in particular the interrupting chamber, the fixed and moving contacts, and the lock, in order to form the circuit breaker.
• An electronic trigger conventionally comprises at least one current measurement block having current sensors and a current measurement electrical processing block having an electronic card and an actuator.
• the wires coming out of the sensors consist of simply enamelled wires. It is customary to add a wire of larger section and insulated by a sheath, whose end can be inserted into a connector provided for this purpose. The connector is then connected by other wires to the electronic card, or is directly attached to the electronic card.
• the electrical connection between the measurement block and the treatment block is via flexible wires.
• This type of electrical connection is fragile, especially when handling blocks when assembling the trigger. There are risks of severing the wires, and risks of jamming of the wires when connecting the two blocks.
• the mechanical assembly of one block relative to the other is generally tedious, both in terms of the relative positioning of the blocks at the level of their mechanical attachment, sometimes achieved by screws whose access is difficult with standard tools of the screwdriver type.
• the attachment of the two blocks must combine with holding means in the assembly position, sometimes made somewhat randomly by the fitter of the apparatus.
• the present invention aims to overcome the various drawbacks mentioned above, by means of an electronic release providing a simplified electrical and mechanical connection and fast, without risk of damage to the electrical connections, and with good mechanical strength.
• the electronic release according to the invention comprises, in a conventional manner, a current measurement block and an electrical treatment block of the current measurement.
• the main idea of this invention is to assemble the measuring and processing blocks in a single gesture, by a translation, while ensuring a simultaneous connection at the electrical level and at the mechanical level.
• the assembly of the trigger is thus very simple. It is not necessary to combine different movements to assemble the blocks, a single movement in a single direction of connection is enough to connect them electrically, position relatively and keep them in position before joining them. According to the different embodiments of the invention, which can be taken together or separately:
• said electrical connection means consist, for each pole, of a male connector belonging to the measurement block and inserted into a female connector belonging to the processing block: the electrical connection between the two blocks is therefore effected via the connectors; . There is no wire connection between the two blocks.
• said male connector comprises a plurality of conductive pins held by a support, each pin having two free ends extending in the X direction from two opposite faces of said support.
• said measuring block is delimited by a housing and comprises, for each pole:
• connection of the wires to the male connector is therefore an operation that is performed during the assembly of the measurement block, which consists of a step well before the connection of the measurement block to the treatment block.
• the housing of the measurement block comprises, for each pole, a salient zone for receiving the male connector, in which the male connector is fixed, and having means for guiding and separating the wire outputs.
• said means for guiding and separating the wire outputs consist of two pads arranged on either side of the first face of the support of the male connector and extending parallel to the pins, so that two wire links each bypass a outward pad to reach two upper pins, and two wired links each bypass one pad inward to reach two lower pins: in this way none of the four wired links can touch another, which avoids any risk of short circuit.
• the female connector of the processing unit is connected by interlocking at a second face of the support of the male connector, opposite the first face.
• said mechanical connection means induce translation locking in the two directions perpendicular to the X direction: thus, when the two blocks are mechanically connected, they can not move in both directions perpendicular to the direction of connection. It is only possible to separate them by performing the reverse translation movement in the X direction.
• said mechanical connection means consist of a dovetail connection.
• said mechanical connection means consist of a tab extending from one block and able to fit into an opening made in the other block.
• the leg consists of a central section extending by a free end wider than the central section, said opening corresponding to a notch cut on the periphery of a wall of a block and having a bottom whose width is smaller than that the free end of the tab and greater than that of the central section of the tab.
• said tab has a T-section.
• said tab extends from the processing block and fits into the opening made in the measurement block, or vice versa, that is to say that the tab extends from the measurement block and inserts into the opening made in the treatment block.
• said mechanical connection means are provided on the blocks between two adjacent poles.
• the invention also relates to a circuit breaker type electrical protection device comprising a breaking block and an electronic release as described above.
• FIG. 1 shows a first face of a current measurement block of an electronic release according to the invention
• FIG. 2 is an enlarged view, in perspective, of the reception area of a male connector belonging to the current measurement block according to FIG. 1;
• FIG. 3 is a perspective view of the male connector of FIG. 2;
• FIG. 4 shows in perspective the electronic processing block of an electronic trigger according to the invention
• FIG. 5 shows in perspective a second face of the current measurement block of an electronic release according to the invention
• FIG. 6 illustrates in perspective and in section the electronic release according to the invention, with conductors and terminals for each pole.
• the electronic release of the invention consists of a current measurement block 1 and an electronic processing block 2 of the current measurement.
• Such an electronic release integrates into an electrical line protection device, circuit breaker type, also having a breaking block.
• the measurement block 1 of current consists of a housing 6 enclosing sensors 29.
• this measurement block 1 is adapted to operate on a three-pole circuit breaker since it has three identical sections 3,4,5, each section being provided for a pole.
• Each section 3,4,5 contains a current measurement sensor 29, which consists of a Rogowski winding, and a current transformer 9.
• the sensor 29 and the transformer 9 consist of parts of revolution, more precisely tori, arranged coaxially, as is best seen in FIG.
• the sensor 29 is composed of a helical winding of wire having two electrical 13,14 wire outputs, particularly visible in FIGS. 2 and 3.
• the current transformer 9 is used to power the electronic cards 33 contained in the processing block 2 to be described later.
• This transformer 9 consists of a winding around the conductor 30, and also has two wire outputs 1 1, 12 electrical. These four wired outputs 1 1, 12, 13, 14 are relatively fragile, and must not come into contact with each other in order to avoid any short circuit.
• wired outputs 1 1, 12, 13, 14 are connected to a male connector 8 housed in a reception area 7 provided for this purpose and protruding from the housing 6.
• This zone 7 is centered on each section 3,4,5 of the measurement block 1, in a transverse plane passing through the axis of the sensor 29 and the transformer 9, so that the wired outputs 14, 12 of the sensor 29 and of the transformer 9 come on the right side of the male connector 8 , and the wired outputs 13.1 1 of the sensor 29 and the transformer 9 come on the left side of the male connector 8.
• This specific arrangement thus makes it possible to separate the wired outputs 1 1, 12, 13, 14 in two groups: the group right 12,14, and the left group 1 1, 13.
• the reception area 7 is provided with two pads 15, 16, located on the left and to the right of the male connector 8.
• one 12 of the two wired outputs 12,14 of the right group is guided so as to walk on the outside of the right stud 16, while the other wired output 14 of the right group chimine on the inside of the right stud 16, that is to say between the right stud 16 and the male connector 8.
• one 1 1 of the two wired outputs 1 1, 13 of the left group is guided so as to walk on the outside of the left stud 15, while the other wired output 13 of the left group walks on the side inside the left stud 15, that is to say between the left stud 15 and the male connector 8.
• the wired outputs 13, 14 of the sensor 29 run on the inner sides of the right and left pins 16, 15, whereas the wired outputs 1 1, 12 of the transformer 9 run on the outer sides of the pins 16, 15 on the right. and left.
• the two wired outputs 1 1, 12 of the transformer 9 are wound around two upper pins 19,20, left and right, while the two wire outputs 13,14 of the sensor 29 are wound around two pins 21, 22 lower, left and right.
• the male connector 8 consists of a support 35 and pins 19, 20, 21, 22.
• the pins 19, 20, 21 pass through the support 35, and thus each have two free ends on either side of the support 35.
• a first face 17 of the support 35 is visible, from which 'extend the four pins 19,20,21, 22.
• a cover 34 is fixed on the section 3,4,5 so as to protect the sensor 29, the transformer 9, and the first face 17 of the support 35 of the male connector 8, as well as the four electrical connections.
• the right-hand and left-hand sections 3 are equipped with the protection cover 34, while the central section 4 is "bare", thus without protective cover 34, to illustrate the positioning of the sensor. 29 and male connector 8.
• Figure 5 shows the backside of the measurement block 1.
• a second face 18 of the support 35 of the male connector 8 is visible.
• the four pins 19, 20, 21, 22 extend from this second face 18.
• the treatment block 2 also comprises an intermediate lock 28, able to trigger the main lock of the circuit breaker (not shown), on the order of an electronic card 33 in the case where it detects a fault (overvoltage, short circuit).
• This processing block 2 provides three female connectors 23 arranged opposite the male connectors 8 of the measurement block 1.
• the housing 32 is perforated at the female connectors 23 to leave them accessible for connection with the male connectors 8.
• Each female connector 23 consists of a support in which are formed four holes that can accommodate the four pins 19,20,21, 22. Each female connector 23 is directly attached to an electronic card 33 which therefore receives the current measurement information from the corresponding sensor 29 of the measurement block 1, and which is supplied via the corresponding transformer 9 of the measurement block 1.
• the peripheral cover 24 thus makes it possible to protect the junction between the two male 8 and female 23 connectors, and to prevent any dust from infiltrating.
• the electrical connection of the two blocks 1, 2 is thus made by simply plugging the three male connectors 8 into the three female connectors 23, in a single insertion direction X, corresponding to the connecting direction of the blocks 1, 2.
• lugs 25 extending from the housing 32 of the treatment block 2 fit into openings 36 provided for this purpose in the housing 6 of the measurement block 1.
• This mechanical connection between the two blocks 1, 2 is also performed in the X direction.
• An opening 36 is provided between two adjacent sections of the measurement block 1, and a tab 25 is provided between two female connectors 23.
• each tab 25 has a T-section, with a central section 26 of small width, ending in a 27 end of large width.
• Each opening 36 consists of a cut made in the housing 6 of the measurement block 1, at a peripheral zone.
• the cutout 36 starts from the periphery of the casing 6 by a first portion 37 of great width, then is extended by a second portion 38 of smaller width, just greater than the width of the central section 26 and much less than the width of the end 27 of the tab 25.
• the central section 26 of the tab 25 is first inserted into the first portion 38 of the blank.
• the latter serves only to guide one block relative to the other, in order to put them in position for plugging connectors 8.23.
• the central portion 26 of the lug 25 is inserted into the second portion 38 of the blank 36, whose width is only slightly greater than that of the central section 26 of the lug 25 so that the leg 25 can slip into this cutout 36 with a small clearance, until it comes into abutment against the bottom 39 of the cutout 36, which also corresponds to the end of travel of the pins 19,20,21, 22 of the male connector 8 in the holes of the female connector 23.
• the two blocks 1, 2 are then connected electrically and mechanically, simultaneously, in a single direction of connection X, and in a single gesture from the operator.
• the processing block 2 is blocked in the Y direction perpendicular to X.
• the treatment block 2 Given the sizing of the second portion 37 of the opening 36 relative to the width of the end 27 of the lug 25, the treatment block 2 is blocked in the Z direction perpendicular to X. The width of the different pieces is marked with respect to the direction Y.
• connection dovetail type or any other type of mechanical connection.
• Figure 6 illustrates the two blocks 1, 2 connected to each other, preferably nested one inside the other.
• a conductor 30 whose current is to be measured passes through each sensor assembly 29 / transformer 9, and terminates in the form of a connection terminal 31.
• the two blocks 1, 2 are more firmly attached to one another when assembled with the other parts of the circuit breaker.
• the measurement block 1 When assembling a circuit breaker, the measurement block 1 is associated with the contact block (not shown), then the treatment block 2 is added to this subassembly before putting everything in place in an envelope. final.
• This implementation is important for the interaction between the intermediate lock 28 of the processing block 2 with the main lock of the contact block. It has two stages.
• the first step is to plug the treatment block 2 into a fork with two arms located in the extension of two flanges comprising the structure of the main lock of the contact block .
• the processing block 2 is provided with two recesses 41 disposed on either side of the intermediate lock 28, and in which the two arms of the fork penetrate, as shown in Figures 4 and 6.
• the second step consists of inserting the contact block / process block 2 subassembly into the final envelope constituting the base of the circuit breaker. To do so, two ears 40 extending from the processing block 2 are plugged on two cylinders extending from the final envelope.
• This plug-in makes it possible to guarantee the non-disconnection of the sensors 9 with respect to the electronic cards 33, that is to say the non-disconnection of the male connectors 8 and the female connectors 23, as well as the non-disconnection of the main lock with respect to the lock.
• intermediate 28 that is to say the non disconnection of the fork with respect to the recesses 41.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Breakers (AREA)
• Transformers For Measuring Instruments (AREA)

Applications Claiming Priority (2)

Publications (2)

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• 2016
  • 2016-07-29 FR FR1657432A patent/FR3054717B1/fr active Active
• 2017
  • 2017-02-09 JP JP2019504709A patent/JP7022738B2/ja active Active
  • 2017-02-09 WO PCT/FR2017/050290 patent/WO2018020085A1/fr active Application Filing
  • 2017-02-09 CN CN201780036046.0A patent/CN109478483B/zh active Active
  • 2017-02-09 EP EP17709129.5A patent/EP3300531B1/de active Active

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