Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
  • H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
  • H01H83/22—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages
  • H01H83/223—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages with bimetal elements

Definitions

• the invention relates to a electric switching device with a bi-metal tripping device and a latching mechanism with a releasing jack system to be triggered by the tripping device via a tripping bridge, in particular a motor protection switch or a circuit breaker.
• the invention also relates to a method for compensation of different bending distances of at least two bi-metal tripping devices of in parallel operated conductor rails.
• the housing allows to capture the bi-metal device group and the releasing jack system in the finally incorporated state for the purpose of calibration of the still not incorporated bridge system by a measurement technology, then to assemble the correspondingly calibrated bridge system, and finally to close the opening by a protective cover. All tolerances concerning the bi-metal tripping device are captured over the complete production and assembly chain during calibration of the bridge system.
• the objective of the invention is to provide an electric switching device with at least two conductor rails, which are operated in parallel, a bi-metal tripping device for each conductor rail and a release jack system to be triggered by the tripping device which does not trip under normal operating states, i.e. which does not trip to early.
• the objective of the invention is also to provide a method for compensating different bending distances of at least two bi-metal tripping devices of in parallel operated conductor rails.
• this objective is achieved by a device having the features of the independent Claim 1.
• Advantageous embodiments of the device are likewise set forth in the subordinate Claims 2 through 6.
• the objective is also achieved by a method according to Claim 7.
• the advantage of the device according to the invention and of the appertaining method realized with this device lies in the effective and reliable combination of a first tripping bridge with a second tripping bridge, the so called differential bridge, and a tripping lever, which is operated by the two bridges. Only in case, both tripping bridges move in general in parallel, the tripping lever will activate the latching mechanism. Additional advantages, special features and practical refinements of the invention can be gleaned from the subordinate claims and from the presentation below of preferred embodiments making reference to the figures.
• FIG. 1 operating diagram of a 4-polar switching device with an overcurrent release, for instance a circuit breaker
• FIG. 1 operating diagram of a 3 -polar switching device with in parallel operated conductor rails in the middle phase and an overcurrent release, for instance a circuit breaker
• thermo-mechanical tripping device with in parallel operated conductor rails in phase 2 with no load and bi-metals in basic position at room temperature
• thermo-mechanical tripping device with in parallel operated conductor rails in phase 2 with symmetric load
• thermo-mechanical tripping device with in parallel operated conductor rails in phase 2 with asymmetric load
• thermo-mechanical tripping device with in parallel operated conductor rails in phase 2 with no load and bi-metals in basic position at room temperature
• thermo-mechanical tripping device Principle of a thermo-mechanical tripping device according to the present invention with in parallel operated conductor rails in phase 2 with symmetric load
• Fig 8 Principle of a thermo-mechanical tripping device according to the present invention with in parallel operated conductor rails in phase 2 with asymmetric load
• Fig 1 an operating diagram of a 4-polar switching device (10) with an overcurrent release (200) and a latching mechanism (300), for instance a circuit breaker, is shown in the tripped position.
• the 4 phases are named as LI, L2, L3 and N.
• the overcurrent release (200) triggers the latching mechanism (300), which operates the contacts (310, 320, 330, 340) in the tripped position.
• FIG 2 an operating diagram of a 3-polar switching device (10) with in parallel operated conductor rails in the middle phase L2 with an overcurrent release (200) and a latching mechanism (300), for instance a circuit breaker, is shown in the tripped position.
• the overcurrent release (200) triggers the latching mechanism (300), which operates the contacts (310, 320, 330, 340) in the tripped position.
• the two middle phases - L2 and L3 in Fig 1 - are connected in parallel. Which such method it is possible to increase the nominal current of the switching device (10).
• the current conducted in phase 2 is divided in two part currents, 12.1 and 12.2, whereas the conducted current in LI is II and in L3 is 13.
• thermo-mechanical tripping device (100) with in parallel operated conductor rails in phase 2 with no load and bi- metals (410, 420, 430, 440) in basic position at room temperature is shown.
• the bi- metals (410, 420, 430, 440) are not bent and extend into corresponding jogs (510, 520, 530, 540) of the first tripping bridge (500).
• the first tripping bridge (500) is in its neutral position as well, i.e. it does not reach the flip point (P) of the latching mechanism (300).
• Fig 4 the principle of a state-of-the-art thermo-mechanical tripping device (100) with in parallel operated conductor rails in phase 2 with symmetric load with nominal current is shown. All bi- metals (410, 420, 430, 440) are bent in the same extend and have moved the first tripping bridge (500) towards the latching mechanism (300) up to the flip point (P) without exceeding it.
• Fig 5 the principle of a state-of-the-art thermo-mechanical tripping device (100) with in parallel operated conductor rails in phase 2 with asymmetric load is shown. Due to causes like different bulk resistances of the conductor rails or different magnetic forces or the like, the current is L2.2 is higher than in L2.1.
• the corresponding second bi-metal 2.2 for phase 2 (430) is more bent than the other bimetals (410, 420, 440).
• the total current is the nominal current
• L2.2 is overloaded and the corresponding second bi-metal 2.2 for phase 2 (430) presses the first tripping bridge (500) that much towards the latching mechanism (300) that the flip point (P) is exceeded.
• the latching mechanism (300) will trip and the switching device (10) breaks the circuit, though there is no overcurrent in total.
• thermo-mechanical tripping device (100) in parallel operated conductor rails in phase 2 with no load and bi- metals (410, 420, 430, 440) in basic position at room temperature is shown.
• first tripping bridge (500) there is a differential bridge (600) and a tripping lever (700) shown.
• the differential bridge (600) is assembled in parallel with the first tripping bridge (500) and has got jogs (610, 620, 630, 640) in such a way that all bi- metals (410, 420, 430, 440) extend in both the jogs (610, 620, 630, 640) in the differential bridge (600) as well as in the jogs (510, 520, 530, 540) in the first tripping bridge (500).
• the jog (610) for bi-metal 1 of phase 1 (410) and the jog (640) for bi-metal 3 of phase 3 (440) are that large in the direction of the longitudinal axis of the differential bridge (600) that the corresponding bi- metals (410, 440) are not able to interact with the differential bridge (600). In case the tripping device 100 has not to conduct any load, both the first tripping bridge (500) and the differential bridge (600) are not moved.
• the tripping lever (700) is assembled movable to both, the first tripping bridge (500) and the differential bridge (600), by pivotable bearings (710, 720) in such an extent, that in case, the first tripping bridge (500) and the differential bridge (600) move in the same manner, it has got its maximum dimension in the direction of the longitudinal axis of the first tripping bridge (500) and the differential bridge (600).
• the in parallel operated part phases L2.1 and L2.2 of the switching device (10) according to the invention are charged with a symmetric load, the tripping bridge (500) and the differential bridge (600) will move in the same manner, like shown in Fig 7.
• All bi- metals (410, 420, 430, 440) are in mesh with the first tripping bridge (500). Due to the current load they bend in the same direction and in the same dimension and interact with the delimitations of the corresponding jogs (510, 520, 530, 540) of the first tripping bridge (500). Due to reasons like friction between the first tripping bridge (500) and the differential bridge (600), or the manner of assembly of the tripping lever (700) to both, the first tripping bridge (500) and the differential bridge (600), the differential bridge (600) moves in parallel with the first tripping bridge (500).
• the tripping lever (700) has got its maximum dimension in the direction of the longitudinal axis of the tripping bridge (500) and the differential bridge (600).
• the tripping device (100) is charged with its nominal current, all bi- metals (410, 420, 430, 440) are bent in the same extend and have moved the first tripping bridge (500) towards the latching mechanism (300) up to the flip point (P) without exceeding it.
• thermo-mechanical tripping device (100) with in parallel operated conductor rails in phase 2 with asymmetric load is shown.
• One bi-metal here: bi-metal 2.2 for phase 2, (430)
• the more bent bi-metal (430) may push the first tripping bridge (500) that much towards the latching mechanism that it exceeds the flip point (P) if there was no differential bridge (600) and tripping lever (700).
• the second jog (620) in the differential bridge for bi-metal 2.1 and the third jog (630) in the differential bridge for bi-metal 2.2 are dimensioned in direction of the longitudinal axis of the differential bridge (600) in that way that the regarding second and third bi-metals for phase 2 (620, 630) are able to interact with the delimitations of this jogs (620, 630).
• the first bi-metal 2.1 for the first part of phase 2 (420) which is not bent that much as the second bi-metal 2.2 for the second part of phase 2 (430), supports the differential bridge (600), so that the differential bridge (600) cannot move in parallel with the first tripping bridge (500).
• the tripping lever (700) turns in its rotatable bearings in the first tripping bridge (500) and the differential bridge (600) in that way that it does not reach its maximum dimension in the direction of the longitudinal axis of the first tripping bridge (500) and the differential bridge (600).
• the flip point (P) of the latching mechanism (300) is not exceeded and the switching device (10) does not break the circuit.

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Citations (4)

• 2010
  • 2010-07-22 EP EP10170526A patent/EP2410554A1/de not_active Withdrawn
• 2011
  • 2011-07-21 WO PCT/EP2011/062571 patent/WO2012010672A1/en active Application Filing
  • 2011-07-21 EP EP11734133.9A patent/EP2596514A1/de not_active Withdrawn

Patent Citations (4)

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