• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a method for checking a multi-pole electric circuit breaker. The multi-pole electrical circuit breaker comprises a plurality of poles (101-103). Each of the plurality of poles (101-103) includes a first terminal (121-123) and a second terminal (131-133), respectively. By closing the respective pole (101-103), the first terminal (121-123) of the respective pole (101-103) is electrically connectable via the pole to the second terminal (131-133) of the respective pole (101-103). The method performs multiple micro-ohm measurements on the multiple poles (101-103) while grounding the multiple poles (101-103) in a P-P-P-E configuration. A contact resistance of one of the multiple poles (101-103) is determined as a function of the multiple micro-ohm measurements.
    公开号:AT516121A1
    申请号:T50536/2014
    申请日:2014-07-29
    公开日:2016-02-15
    发明作者:Ulrich Klapper
    申请人:Omicron Electronics Gmbh；
    IPC主号:
    专利说明:

    Checking a multi-pole electrical circuit breaker
    The present invention relates to a method and a measuring device for verifying a multi-pole electrical circuit breaker, in particular a carrying out a micro-ohm measurement on multi-pole load or Leistungsschal¬tern while these are grounded on both sides.
    Circuit breakers, load switches, disconnectors and earthing disconnectors are central components in electrical switchgear and are periodically serviced and inspected to ensure their proper functioning. Power engineering equipment, e.g. Power plants such as power plants or power transmission systems may, for example, use circuit breakers for switching operating currents, but in the case of faults also switching high overload currents or short-circuit currents. Circuit breakers can be used both to turn on these currents and turn off the currents. Preferably, the switches in the closed state have a very small contact resistance in order to avoid unnecessary heating of the switch and to safely conduct and not overheat in the event of a fault current in which severalteen kA can flow. Multi-pole power switches are used to switch multiphase currents. Each pole of the multi-pole circuit breaker switches one of the several phases and encloses one or more series-connected switching contacts, so-called interrupters or interruption units. A switch in a three-phase network thus comprises three poles, which in each case can again comprise one or more breakers in series.
    In a review of such a switch, such as a circuit breaker, this is first opened, then separated by disconnectors from the rest of the system and finally all the poles of the switch are grounded on both sides.Beim grounding a multi-pole switch, for example, a multi-pole Leis¬tungsschalters, There are two common procedures. For example, it is customary in many parts of Europe to connect each pole individually on both sides directly to earth via a corresponding grounding line. In, for example, the United States of America, it is customary to ground a first pole on both sides via corresponding grounding lines and then to connect the first pole to a second pole on both sides and then to connect the second pole to the third pole on both sides connect. This type of grounding is also referred to as P-P-P-E. Regardless of the type of grounding, it is advisable for safety reasons to always ground all poles of the switch on both sides.
    In a review of an electrical circuit breaker, a so-called micro-ohm test is usually carried out, in which the resistance occurring at the circuit breaker is measured when the circuit breaker or circuit breaker is closed by supplying a predetermined current and applying a voltage across the switch, ie at several breakers per phase all breakers together, is measured. The predetermined current may be several hundred amperes, for example 200 amps. Furthermore, when checking the electrical circuit breaker so-called timing test can be performed, in which a switching period is detected, which requires the switch to execute the switching command after applying a control command. However, as long as the circuit breaker is grounded on both sides, it is not readily possible to perform such checks because the two-sided grounding affects the measurements.
    The object of the present invention is therefore to enable a safe, accurate and reliable testing of a grounded multi-pole electrical circuit breaker.
    According to the present invention, this object is achieved by a method for verifying a multi-pole electric circuit breaker according to claim 1 and a measuring device for checking a multi-pole electrical Leis¬tungsschalters according to claim 10. The dependent claims define preferred and advantageous embodiments of the invention.
    According to the present invention, there is provided a method of checking a multi-pole electric circuit breaker. The multi-pole power switch comprises a plurality of poles. Each of the plurality of poles is associated with each of a plurality of phases of a polyphase network and each includes a first terminal and a second terminal. By closing the respective pole, the first terminal of the respective pole can be electrically connected to the second terminal of the respective pole via one or more interrupters. The first terminal of one of the several poles is connected to a ground potential via a first grounding cable and the second terminal of the one pole is connected to the ground potential via a second grounding cable. As a result, one pole is grounded on both sides. Each additional pole of the circuit breaker is switched either in parallel with one pole or in parallel with another of the other poles. As a result, the other poles are also grounded on both sides. In other words, the plurality of poles are not grounded on both sides directly, but only one pole is grounded and the other poles grounded from this pole. The poles are thus grounded according to the previously described P-P-P-E configuration. An order in which the poles are arranged and grounded is not relevant. For safety reasons, however, first one pole should be connected to the ground potential via the first and second grounding cables and then the further poles should be connected one after the other parallel to one pole or to another of the other poles. Finally, in this type of grounding, for example, the first terminal of a first pole is directly connected to ground potential via the first grounding wire, and the first terminal of a second pole is connected to the first terminal of the first pole via another cable and the first terminal of a third pole connected via another cable to the first terminal of the second pole, etc. The same applies to the second terminals of the plurality of poles. In the method, multiple micro-ohm measurements are made on the plurality of poles while the multiple poles are grounded on both sides. In each of the several micro-ohm measurements, in each case a current is impressed on, for example, the first terminal of the respective pole and removed at the second terminal of the respective pole. Furthermore, a voltage across the first terminal and the second terminal of the respective pole is detected. Because of the mutual ground, a resistance determined from a ratio of measured voltage and impressed current usually does not correspond to a contact resistance of the pole in question. Nevertheless, a transient resistance of one of the plurality of poles may be determined depending on the multiple micro-ohm measurements. By means of the plurality of micro-ohm measurements, it is possible to calculate the errors arising from the grounding on both sides and thus to obtain an accurate measurement result of the contact resistances of the individual poles.
    The multi-pole circuit breaker may in particular comprise a three-pole power switch with three poles. In the so-called PPPE grounding described above, a first pole of the three poles is then connected directly to the ground potential via the first and second ground cables, a second pole of the three poles is connected via two further cables parallel to the first pole and a third pole of the three poles is connected two more cables connected in parallel to the second pole. The micro-ohm measurements can be carried out, for example, with two micro-ohmmeters, which are connected simultaneously to two of the three poles. For example, a first micro-ohmmeter may be connected to the first pole and a second micro-ohmmeter may be connected to the third pole. As an alternative, the micro-ohm measurements can additionally be carried out with three micro-ohmmeters, which are connected simultaneously to the three poles. Each microhmmeter can comprise a current source and a voltage measuring device. The current source may have a current in the range of a few tens to a few hundred amperes, for example, a current of 50 amps, 100 amps or 200 amps. Furthermore, the plurality of micro ohm meters can have different current intensities. With the two or three micro ohmmeters a number of Mikroohm¬ measurements can be performed simultaneously or successively. Due to the multiple measurements, an equation system can be set up in which, for example, the resistances of the connections to earth, between the poles as well as those of the closed poles appear as unknown quantities. With appropriate equivalent circuit diagram and with a sufficient number of measurements, the system can be solved or solved by over-complete determination also approximately. In particular, the resistances of the closed interrupters of the several poles can be determined in this way. By using different current intensities, more independent solutions for the equation system can be set up, so that the system becomes solvable or, if overestimated determination, measurement tolerances can be compensated.
    In a further embodiment, the plurality of micro-ohm measurements are carried out successively at different switching position combinations of the poles. Preferably, it is measured once when all poles are closed and once when all poles are open. However, any other combinations are possible. In other words, a first switch position combination is set in which poles of a first group of the plurality of poles are closed and the remaining poles of the plurality of poles are opened. In this first switch combination, multiple first micro-ohm measurements are taken at the plurality of poles with the multiple poles still grounded on both sides. Thereafter, a second switch position combination is set in which poles of a second group of the plurality of poles are closed and the remaining poles of the plurality of poles are opened. The second group is different to the first group. While the plurality of poles are set in the second switching combination and are grounded on both sides, a plurality of second micro-ohm measurements are performed. As a result, the number of linearly independent solutions for the system of equations can be increased in order to obtain a sufficient number of solutions in order to determine the unknown resistances, in particular the contact resistances of the poles. Specifically, as previously mentioned, for example, the plurality of first micro-ohm measurements may be performed when all three poles are closed, and the multiple second micro-ohm measurements may be performed when all three poles are opened. As a result, it is possible to set up particularly well-resolvable systems of equations. Furthermore, the poles can be actuated automatically by a corresponding controller, so that the checking can be carried out automatically.
    In a further embodiment, the plurality of micro-ohm measurements are performed on the plurality of poles such that a respective micro-ohmmeter is coupled to the first terminal and the second terminal of a respective pole. The current source and the voltage measuring device of a respective micro-ohmmeter are preferably set by means of a four-wire measurement exactly to the junctions of the earth connections, ie to the first connection and the second connection of the respective pole, so that the equation systems to be solved are as simple as possible. As an unknown resistance, then essentially the contact resistances of the poles as well as the resistance of the connections between the poles or between the pole and earth occur.
    In another embodiment, in performing the multiple micro-ohm measurements, one or more poles are opened or closed, and a current and voltage waveform is detected during opening or closing of the pole. Depending on the detected time profile of current and voltage, a time profile of the contact resistance of the pole is tuned. If the micro-ohmmeters are able to perform time measurements at the terminal, a micro-ohm measurement, a switching time measurement and a dynamic resistance measurement can be carried out without rewiring the ground connections and the measurement setup. As a result, the circuit breaker can be comprehensively checked in a short time.
    According to the present invention, there is further provided a measuring device for checking a multi-pole electric circuit breaker, in particular a three-pole circuit breaker. The multi-pole circuit breaker comprises a plurality of poles, wherein each of the plurality of poles is in each case assigned to one of several phases of a multi-phase network and in each case comprises a first connection and a second connection. By closing the respective pole, the first terminal of the respective pole can be electrically connected to the second terminal of the respective pole. The first terminal of one of the plurality of poles is connected to a ground potential via a first grounding wire, and the second terminal of the one pole is connected to ground potential via a second grounding wire. As a result, one pole is grounded on both sides. With a further connecting cable, each further pole of the plurality of poles is switched either parallel to the one pole or parallel to another of the further poles. As a result, the other poles are grounded on both sides. Overall, the poles of the multipole electrical circuit breaker are grounded in a P-P-P-E configuration. The measuring device comprises a micro-ohm measuring device for performing a plurality of micro-ohm measurements on the plurality of poles while the plurality of poles are grounded on both sides of the first terminal and the second terminal. The plurality of micro-ohm measurements are performed on the first terminal and the second terminal of a respective pole, respectively. For this purpose, in each of the several micro-ohm measurements, in each case a current can be impressed on, for example, the first terminal of the respective pole and removed at the second terminal of the respective pole. Furthermore, a voltage between the first terminal and the second terminal of the respective pole can be detected , Due to the two-sided grounding, a resistance which is determined from a quotient of measured voltage and impressed current, however, generally does not correspond to a transition resistance of the relevant pole. The micro-ohm measuring device may, for example, comprise a plurality of micro-ohmmeters which are simultaneously connected to different ones of the several poles. Alternatively, the micro-measuring device may comprise only a single micro-ohmmeter which is connected in chronological succession to different poles of the plurality of poles. The measuring device further comprises a processing device capable of determining a contact resistance of a pole in dependence on the plurality of micro-ohm measurements. In particular, the processing device may be capable of solving a linear system of equations or an overdetermined system of linear equations, which is defined by the micro-ohm measurements determined by the micro-ohm-measuring device and has the transition resistances of the plurality of poles as unknowns. Furthermore, the processing device can be configured to output operating instructions, for example via a user interface, to an operator for carrying out the micro-rohm measurements and for connecting the micro-ohmmeters. Furthermore, the processing device may include an interface for driving the power switch to selectively connect the power switch or individual poles of the power switch to the open or closed states to perform micro-ohm measurements in these states.
    The measuring device is thus designed to carry out the method described above for checking a multi-pole electrical circuit breaker and therefore also includes the advantages described above in connection with the method.
    Although the specific features described in the summary above have been described in conjunction with specific embodiments, it is to be understood that the features of the described embodiments may be readily combined with one another.
    The present invention will be explained below in detail with reference to the drawings.
    Fig. 1 shows schematically a measuring device according to an embodiment of the present invention in connection with a three-pole circuit breaker.
    2 shows a method for checking a multi-pole electrical circuit breaker according to an embodiment of the present invention.
    Fig. 1 shows a three-pole electrical circuit breaker comprising three poles 101-103 for switching three phases of a three-phase current. The first pole 101 switches a first of the three phases, the second pole 102 switches a second of the three phases, and the third pole 103 switches a third of the three phases. Each pole 101-103 comprises a first connection 121-123 and a second connection 131- 133 for connecting three-phase Stromübertra¬gungsleitungen, and one or more series-connected switch contacts, so-called breakers or interruption units, which can optionally be closed or opened. By closing the respective pole 101-103, the first terminal of the respective pole is electrically connected to the second terminal of the respective pole. Thus, by closing the pole 101, the first terminal 121 is electrically connected to the second terminal 131. Also, by closing the pole 102, the first terminal 122 is electrically connected to the second terminal 132, and by closing the pole 103, the first terminal 123 is electrically connected to the second terminal 133. For example, the three poles 101-103 may be switched simultaneously or separately with the aid of a suitable drive. In the closed state, each of the poles 101-103 has a contact resistance, which is shown in the schematic representation of FIG. 1 as a resistor 111, 112 and 113, respectively. The resistor 111 thus represents the contact resistance of the pole 101, the resistor 112 represents the contact resistance of the pole 102, and the resistor 113 represents the contact resistance of the pole 103.
    When the circuit breaker is checked, the contact resistances 111-113 of the poles 101-103 are checked. The poles 101-103 should each have a very small contact resistance in the closed state in order not to overheat during operation and to safely conduct and not overheat in the case of fault current, in which some tens of kA can flow. Verification of the poles 101-103 will be described below in detail with reference to a method 200 shown in FIG. 2.
    When a circuit breaker is tested, the poles 101-103 are first opened, and the entire circuit breaker is disconnected from the remainder of the system by means of disconnectors, for example from energy transmission lines. Then, in step 201, the three poles 101-103 are grounded on both sides. For this purpose, the first connections 121-123 and the second connections 131-133 are connected to ground potential. The ground potential is gekennzeich¬ in Fig. 1 by the reference numerals 14 and 15 net. A common grounding scheme is P-P-P-E grounding in which a first phase is directly coupled to ground potential on both sides, a second phase is switched in parallel with the first phase, and a third phase is switched in parallel with the second phase. FIG. 1 shows such a P-P-P-E grounding scheme. The first terminal 121 of the first pole 101 of the first phase is directly connected via a first grounding cable 16 to ground potential 14. The second terminal 131 of the first pole 101 is connected directly to the ground potential 15 via a second grounding cable 17. The resistance of the first and second earthing cables 16, 17 is symbolized by a resistor 22. Alternatively, two resistors, one for each grounding cable 16, 17, could be represented symbolically. However, as will be shown below, from the point of view of a micro-ohm measurement, the resistances of the grounding cables 16, 17 are in any case in vein, the total resistance of the grounding cables 16, 17 can be represented symbolically by the resistor 22. The first terminal 122 of the second pole 102 is connected via a cable 18 to the first terminal 121 of the first pole 101. The second terminal 123 of the second pole 102 is connected via a cable 19 to the second terminal 131 of the first pole 101. Thus, the second pole 102 is connected in parallel with the first pole 101. The common resistance of the cables 18, 19 is shown symbolically in FIG. 1 by the resistor 23. The third pole 103 is connected via cables 20, 21 parallel to the second pole 102. In other words, the first terminal 123 of the third pole 103 is connected to the first terminal 122 of the second pole 102 via the cable 20, and the second terminal 133 of the third pole 103 is connected via the cable 21 to the second terminal 132 of the second pole 102 The cables 18-21 each represent direct connections between the terminals 121-123 and 131-133. A total resistance of the cables 20, 21 is shown symbolically in FIG. 1 by the resistor 24. The total resistance of the cables 18, 19 is represented symbolically in FIG. 1 by the resistor 23.
    Alternatively, the three poles 101-103 may also be grounded in a so-called P-P-P-E ground. In this case, the first terminal 121 of the first pole 101 is connected directly to ground potential and the second terminal 133 of the third pole 103 is connected directly to ground potential. The remaining first terminals 122 and 123 are connected to the first terminal 121 of the first pole 101 as described above, and the remaining second terminals 131 and 132 are connected to the second terminal 133 of the third pole 103 as described above.
    To the poles 101-103 now a measuring device is connected, which comprises three micro-meters 11,12 and 13. Each micro-ohmmeter 11-13 each comprises a current source 30 and a voltage measuring device 31, e.g. a voltmeter. In FIG. 1, the current source 30 and the voltage measuring device 31 are provided with reference numerals only for the micro-ohm measuring device 11. However, the micro-ohmmeters 12 and 13 include comparable current sources and voltage measuring devices. The micro-ohmmeter 11 is coupled to the first terminal 121 and the second terminal 131 of the first pole 101 via a four-wire connection. As a result, influences of the supply lines between the first and second terminals 121, 131 and the micro-ohm measuring device 11 can be avoided. The second Mikroohmmeter 12 is also connected via a four-wire connection with the first terminal 122 and the second terminal 132 of the second pole 102. The third micro-ohmmeter 13 is connected to the first terminal 123 and the second terminal 133 of the third pole 103 via a four-wire connection. Alternatively, the current source 30 and the voltage measuring device 31 can also be connected at different points of the respective pole 101-103, whereby, however, a resulting equation system becomes more complex, since additionally unknown resistances between these points would have to be considered.
    In step 202, a switch position combination of poles 101-103 is now set. In step 203, then micro-ohm measurements are performed with the micro-ohmmeters11-13. This is repeated for a certain amount of switch point combinations. For example, the micro-ohm measurements may be performed once in step 203 while all three poles 101-103 are open and once again while all three poles 101-103 are closed. In step 204 it is checked whether all desired switch position combinations have been set and corresponding micro-ohm measurements have been made. Other combinations in which only one or two of the poles 101-103 are closed may also be performed. The resistor network shown in FIG. 1 with the unknown resistors 22-24 and 111-113 can be solved with the aid of the currents and measured voltages impressed with the micro-ohmmeters 11-13, for example by applying Kirchhoff's rules. For example, in step 205, a linear system of equations with the unknown resistors 22-24 and 111-113 can be set up and this equation system can be solved in step 206.
    Depending on the number of micro-ohm measurements performed in step 203, the equation system established in step 205 may even be over-tuned. In this case, the unknown resistors 22-24 and 111-113 can be approximately determined, but these approximate solutions have a high accuracy, since measurement tolerances can be compensated. The Mikroohmmeter 11-13 can also work with different Strö¬men, for example, with 50, 100 or 200 amps DC. The different currents give rise to different conditions, which offer further possibilities to provide solutions for the system of equations.
    The four-wire connections to the first and second connections 121-123 and 131-133 shown in FIG. 1 provide a four-wire measurement and should as accurately as possible attach to the junctions of the connections so that the solving systems of equations are as simple as possible.
    The micro-ohmmeters can furthermore be configured such that they perform time measurements on the poles 101-103 assigned to them. As a result, a micro-ohm measurement and a switching time measurement as well as a dynamic resistance measurement without rewiring of the grounding and the measurement setup can be carried out, as a result of which the method can be carried out in a time-saving and risk-minimizing manner.
    权利要求:
    Claims (11)
    [1]
    1. A method for testing a multi-pole electrical circuit breaker, wherein the multi-pole circuit breaker comprises a plurality of poles (101-103), each of the plurality of poles (101-103) each having a first terminal (121-123) and a second terminal ( 131-133), wherein by closing the respective pole (101-103) the first terminal (121-123) of the respective pole (101-103) electrically connects to the second terminal (131-133) of the respective pole (101-103) is connectable, wherein the first terminal (121) of one (101) of the plurality of poles (101 -103) via a first grounding cable (16) with a Erdpotenti¬al (14) is connected and the second terminal (131) of the one pole (101) is connected to the ground potential (15) via a second grounding cable (17), and wherein each further pole (102, 103) of the plurality of poles (101-103) is connected either parallel to one pole (101) or parallel to another of another pole (102, 103), the method comprising: Performing (203) a plurality of micro-ohm measurements on the plurality of poles (101-103) while the plurality of poles (101-103) are grounded on both sides, and determining (206) a contact resistance (111-113) of one of the plurality of poles (101-103) in FIG Dependence on the several Mikroohmmessun¬gen.
    [2]
    2. The method of claim 1, wherein each of a plurality of Mikroohmmes¬sungen a current at the first terminal (121-123) of the respective Pols (101-103) is impressed and the current at the second terminal (131-133) of the each pole (101-103) is removed and a voltage between the first terminal (121-123) of the respective pole (101-103) and the second terminal (131-133) of the respective pole (101-103) is measured.
    [3]
    The method of claim 1 or 2, wherein the multi-pole circuit breaker comprises a three-pole three-pole circuit breaker (101-103), wherein the micro-ohm measurements are performed with two micro-ohmmeters (11, 13) simultaneously connected to two (101, 103) of the three poles (101-103).
    [4]
    4. The method according to any one of the preceding claims, wherein the mehrpo¬lige circuit breaker comprises a three-pole circuit breaker with three poles (101-103), the Mikroohmmessungen with three Mikroohmmeters (11-13) durch¬geführt, which at the same time to the three poles (101-103).
    [5]
    A method according to claim 3 or 4, wherein each micro-ohmmeter (11-13) comprises a current source (30) and a voltage measuring device (31).
    [6]
    6. The method of claim 5, wherein a current intensity of the current source (30) from a first of the Mikroohmmeter (11-13) and a current strength of the current source (30) of a second of the Mikroohmmeter (11-13) are different.
    [7]
    7. The method according to claim 1, wherein the carrying out of the plurality of micro-ohm measurements comprises: setting (202) a first switch position combination, wherein poles of a first group of the plurality of poles (101-103) are closed in the first switch position combination and the remaining poles of the plurality of poles (101-103) are opened, performing (203) a plurality of first micro-ohm measurements on the plurality of poles (101-103) while the plurality of poles (101-103) are set in the first switching combination and grounded on both sides, adjusting ( 202) of a second switch position combination, wherein in the second switch position combination poles of a second group of the plurality of poles (101-103) are closed and the remaining poles of the plurality of poles (101-103) are opened, the second group being different from the first group, and performing (203) a plurality of second micro-ohm measurements on the plurality of poles (101-103) while the plurality of poles (101-103) set in the second Schaltstelεlungskombination and grounded on both sides.
    [8]
    8. The method according to any one of the preceding claims, wherein the performing (203) of the plurality of micro-ohm measurements at the plurality of poles (101-103) comprises: coupling a respective Mikroohmmeters (11-13) with the first terminal (121-123 ) and the second terminal (131-133) of the respective pole.
    [9]
    9. The method of claim 1, wherein performing the plurality of micro-ohm measurements comprises: opening or closing one pole of the plurality of poles, and detecting a time course of the micro-ohm measurement during opening or closing of the pole, and determining a Time course of the contact resistance of the pole in dependence on the detected time course of the micro-ohm measurement.
    [10]
    10. Measuring device for checking a multi-pole electrical circuit breaker, wherein the multi-pole circuit breaker comprises a plurality of poles (101-103), each of the plurality of poles (101-103) each having a first terminal (121-123) and a second terminal (131 133), wherein by closing the respective pole, the first terminal (121-123) of the respective pole is electrically connectable to the second terminal (131-133) of the respective pole, the measuring device comprising: a first grounding cable (16) for connecting the first one Terminal (121) of one (101) of the plurality of poles (101-103) having a ground potential (14), and a second grounding cable (17) for connecting the second terminal (131) of the one pole (101) to the ground potential ( 15), and further connecting cables (18-21) for switching each further pole (102, 103) of the plurality of poles (101-103) either parallel to the one pole (101) or parallel to another of the further poles (102, 102, 103), a micro-ohmmeter orrichtung (11-13) for performing a plurality of Mikroohmmessungen at the plurality of poles (101-103) while the plurality of poles (101-103) are grounded on both sides, and a processing device which is configured, a transition resistance of a pole in dependence from the several micro-ohm measurements.
    [11]
    11. Measuring device according to claim 10, wherein the measuring device for carrying out the method according to one of claims 1-9 is configured.
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    AT516121B1|2014-07-29|2016-09-15|Omicron Electronics Gmbh|Checking a multi-pole electrical circuit breaker|
    CN106716155A|2014-08-12|2017-05-24|欧米克朗电子有限公司|Test system and method for testing a circuit breaker|AT516121B1|2014-07-29|2016-09-15|Omicron Electronics Gmbh|Checking a multi-pole electrical circuit breaker|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50536/2014A|AT516121B1|2014-07-29|2014-07-29|Checking a multi-pole electrical circuit breaker|ATA50536/2014A| AT516121B1|2014-07-29|2014-07-29|Checking a multi-pole electrical circuit breaker|
    PCT/EP2015/066885| WO2016016086A1|2014-07-29|2015-07-23|Checking a multi-pole electrical circuit breaker|
    US15/312,090| US10088509B2|2014-07-29|2015-07-23|Checking a multi-pole electrical circuit breaker|
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