• 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 measuring a resistance of a connecting contact (16) of an electrical power switch (11) . In the case of the process, a first resistance value is determined via the power switch (11), while the power switch (II) is grounded on both sides, and the connecting contact (16) is closed. Furthermore, a second resistance value is determined via the power switch (11), while the power switch (11) is earthed on both sides, and the connecting contact (16) is opened. Depending on the first resistance value and the second resistance value, the resistance of the closed switching contact (16) is determined.
    公开号:BR102013021508B1
    申请号:R102013021508-2
    申请日:2013-08-22
    公开日:2021-05-18
    发明作者:Ulrich Klapper；Wernich De Villiers；Reinhard Kaufmann
    申请人:Omicron Electronics Gmbh；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a process and a device for measuring a resistance of a switching contact of an electrical power switch, as well as a process and a device for measuring the resistance of switching contacts arranged in a series connection of an electrical power switch. The present invention relates, in particular, to a measurement of resistances of passage of the closed switching contact or the closed switching contacts of the electrical power switch.
    [0002] Power switches, which are also referred to as high voltage switches, load switches or circuit breakers are employed in power technology in order to produce or separate an electrical connection under load. The rated voltages of the power switches can range from a few volts to a few hundred kilovolts. In the event of a short circuit, the connected load currents can be tens of kiloampere. For this reason, for example, in the revision table, for reliable operation of the power switch, the resistance to passing of a switching contact or of several switching contacts arranged in series on the electrical power switch is tested.
    [0003] Power switches for medium voltage installations generally have only one switching contact, which can be opened or closed. Power switches in high and maximum voltage installations can comprise so-called breaker units in a series connection. In the case of connecting several breaker units in series, capacitors with a capacity in the range of a few picofarads are generally still arranged, parallel to the individual breaker units, in order to evenly distribute the voltage to the individual breaker units . Several breaker units in one phase of a power switch are usually opened or closed simultaneously.
    [0004] In power switches, resistance measurement at the closed switching contact, which is also referred to as micro-ohm measurement, is a standard process for evaluating a quality or wear condition of the power switch. .
    [0005] Micro-ohm measurement is generally carried out on the fact that, for example, a high direct current of 100 amps is applied via a closed switching contact. Current is supplied for this via current terminals which are screwed on both sides of the power switch into the conductors, which lead away from the power switch. With other terminals, the voltage is picked up on both sides of the power switch. The voltage terminals are normally placed close to the switching contact of the power switch, and thus a so-called four-wire measurement is carried out. In this way it can be avoided that the voltage drop is measured together at the current terminals, as a result of which the measurement result would be falsified. The resistance of the closed switching contact can be determined from the applied current and the measured voltage, including the resistance of the supply lines from the voltage terminals to the switching contact. Alternatively, instead of current and voltage terminals, so-called Kelvin terminals can be used. In the case of Kelvin terminals, two clamps of a respective terminal are electrically isolated from each other, current is supplied via one of the two clamps, and voltage is picked up via the other of the two clamps. The advantage of these Kelvin terminals is that only one terminal must be tightened on each side of the power switch.
    [0006] As already described before, for the micro-ohm measurement a current source and a voltage meter can be used, in such a way that the voltage measurements can be performed one after the other on the various switching contacts. Several voltage meters can also be used, whereby with a common current source the current is applied through several contacts, and with several voltage meters several voltage values can be determined at the same time.
    [0007] Since in power technology installations, for example in a substation, at various points dangerously high voltages can arise, it is necessary to ground the power switch during this micro-ohm measurement. For example, the power switch can be separated on both sides of the remaining power network and can be grounded on one side. Microohm measurement, then, with closed switching contact or closed switching contacts, can be performed accurately. Other measurements are often carried out on the power switch, in which the switching contact needs to be opened at least partially, for example a measurement of the time the switch needs for opening. For measurements of this type, earthing on both sides of the switch is recommended, in order to avoid a risk of people carrying out the measurement. Therefore, for the micro-ohm measurement one of the two grounds needs to be removed for the duration of the measurement, which is however very inconvenient, or the micro-ohm measurement is incorrect with ground on both sides due to the loop of parallel ground.
    [0008] In order to be able to perform a micro-ohm measurement on a power switch efficiently, the power switch can be grounded on both sides, and with a current clamp enabled for direct current, or a Shunt can be The part of the current that passes from the current source through the grounding fittings is calculated and can be used to correct the measured resistance. This process is actually very accurate, however it has the disadvantage that additional measurements are required via the current clamp or Shunt.
    [0009] Therefore, the task of the present invention is to enable an efficient resistance measurement or micro-ohm measurement for one or several switching contacts of an electrical power switch, and a risk of staff, who carry out the resistance measurement.
    [00010] This task, according to the present invention, is solved by a process for measuring a resistance of a switching contact of an electrical power switch, by a device for measuring a resistance of a switching contact of an electrical power switch, by a test environment for measuring a resistance of a switching contact of an electrical power switch, by a process for measuring resistances of switching contacts arranged in a series connection of a electrical power switch and by a device for measuring the resistances of switching contacts arranged in a series connection of an electrical power switch. The embodiments define preferred and advantageous embodiments of the invention.
    [00011] According to the present invention a process is prepared for measuring a resistance of a switching contact of an electrical power switch. In the process case, a first resistance value is determined via the power switch, while the power switch is grounded on both sides and the switching contact is closed. In addition, a second resistance value is determined via the power switch, while the power switch is grounded on both sides and the switching contact is opened. Depending on the first resistance value and the second resistance value, the resistance of the closed switching contact is determined. Grounding on both sides can be achieved, for example, by means of two earth ground grommets for the corresponding conductors. Correspondingly, earthing can be carried out by means of an earthing collar, which is only connected to earth once, and has several connections, with which it can be earthed. The first resistance value with closed switching contact corresponds to a resistance of the parallel connection formed by closed switch and ground. The second resistance value corresponds to the grounding resistance. The resistance of the Rswitch closed switching contact can be determined, for example, by the following equation:

    [00012] Where, R1 is the first resistance value, and R2 is the second resistance value. Since between the two measurements the wiring does not need to be changed, the measurement can be performed very accurately.
    [00013] According to an embodiment, the first and second resistance values are respectively determined, whereby a direct current is applied to the power switches grounded on both sides, and a voltage is measured via the power switch. With this, usual microohm measuring devices can be used to determine the first and second resistance values.
    [00014] The power switch may comprise a three-phase switch. At least one switching contact is coordinated to each phase. Three-phase switches can comprise a common drive or three separate drives. In the case of some three-phase switches, some individual phases can also be connected individually, for example, in cases where a fault only occurs in one phase, and therefore only one phase is required to be switched off. The process described above can be used individually for each phase and is therefore also suitable for polyphase power switches. The process can also be carried out simultaneously in two or more phases, whereby a test of a polyphase switch can be carried out efficiently. According to another embodiment, the power switch can comprise a high voltage, high voltage or medium voltage switch. Since the process is independent of the voltage to be connected from the power switch, it can be used for medium voltage switches with a nominal voltage of 1 kV to 45 kV, for a high voltage switch with a nominal voltage of 45 kV at 150 kV, or for a maximum voltage switch with a rated voltage above 150 kV.
    [00015] Furthermore, according to the present invention a device for measuring a resistance of a switching contact of an electrical power switch is prepared. The device comprises a control unit for controlling the electrical power switch in order to optionally open or close the switching contact of the power switch. The device further comprises a resistance measuring device which can be coupled to the control unit and the power switch. The resistance measuring device is in the situation of determining a first resistance value via the power switch, while the power switch is grounded on both sides, and the switching contact is closed. Furthermore, the resistance measuring device is in the situation of determining a second resistance value via the power switch, while the power switch is grounded on both sides and the switching contact is opened. Depending on the first resistance value and the second resistance value, the resistance measuring device defines the resistance of the closed switching contact. In particular, when the resistance measuring device is coupled to the control unit for the opening and closing of the switching contact of the power switch, the resistance measurement can be carried out fully automatically. For example, after connecting the resistance measuring device to the electrical power switch, and after grounding the power switch on both sides first automatically the switching contact of the power switch is closed, so the first resistance value is measured and then after the switching contact is automatically opened, the second resistance value can be measured. In conclusion, the resistance measuring device according to the equation described above can determine and output the resistance of the switching contact.
    [00016] In addition, the device can be configured to carry out the process described above, or one of its execution forms, and therefore also includes the advantages described above.
    [00017] According to the invention in question, furthermore, a test environment is prepared for measuring a resistance of a switching contact of an electrical power switch. The test environment comprises the power switch, a first and second grounding grommet, and a resistance measuring device. The first grounding trim can be coupled to a first side of the power switch in order to ground the first side of the power switch. The second grounding trim can be attached to a second side of the power switch in order to ground that second side. The resistance measuring device can be coupled to both sides of the power switch in such a way that, with the aid of the resistance measuring device, a first resistance value can be determined via the power switch, while the power switch is grounded on both sides, and the switching contact is closed, and a second resistance value can be determined through the power switch, while the power switch is grounded on both sides, and the switching contact is open. The resistance of the closed switching contact can also be determined using the resistance measuring device as a function of the first resistance value and the second resistance value.
    [00018] According to the invention in question, furthermore, a process for measuring the resistances of switching contacts of an electrical power switch is prepared. The switching contacts of the electrical power switch are arranged in a series connection. In the case of the process, a first measuring current is supplied or applied in a first direction via a first switching contact. Furthermore, a second measuring current is supplied or applied in a second direction via a second switching contact of the switching contacts arranged in the series connection. The first direction and the second direction of the first or second measuring currents are directed in opposition to the switching contacts, referring to the series connection. The series connection is earthed on both sides, ie the first and second measuring currents are supplied, while the series connection is earthed on both sides. A resistance value of the first switching contact is determined as a function of the first measuring current, while the first and second switching contacts are closed. Expressed in another way, the first and second measuring currents are fed, in switching contacts arranged in series, in respectively opposite directions. For example, in the case of two switching contacts with respectively a corresponding current source, a current can be fed once from a point between the switching contacts, to respectively a point at the two ends of the power switch. If the first measuring current and the second measuring current are respectively 100 amps, then a current of 100 amps passes from the center point between the two switching contacts in one direction through the first switching contact, and another 100 amp current from this point in the opposite direction through the second switching contact. Under symmetric conditions, that is, when the two closed switching contacts have approximately or exactly the same resistance, the two switching contacts essentially have the same voltage drop, whereas the voltage drop at the first switching contact closed occurs in the opposite direction to the voltage drop across the second closed switching contact. Due to the grounds, which for safety reasons are connected on both sides of the power switch, therefore, in essence, no current flows, so that, also in essence, no voltage drops to the ground. As a result, grounding does not essentially influence the measurement of the reference value of the first switching contact.
    [00019] According to an embodiment, moreover, a resistance value of the second switching contact can be determined as a function of the second measuring current, while the first and second switching contacts are closed. Since essentially no current is passed through the earthing loop, the resistance value of the second switching contact can also be determined with high accuracy.
    [00020] If the power switch has more than two switching contacts arranged in series, the arranged switching contacts can be closed when determining the resistance values of the first and second switching contacts. Since, through the earthing loop, in essence, no current flows, for example, in a power switch with four switching contacts, of which, however, only two are currently measured as described above, all four contacts switches are closed without negatively influencing the measurement. In this case, the power switch can be connected in its usual operating types, ie either all switching contacts can be opened or all switching contacts can be closed.
    [00021] According to another embodiment, the resistance values of the first and second switching contacts are determined by the fact that a first voltage is measured through the first switching contact, and a second voltage is measured through the second switching contact. Depending on the first measuring current and the first voltage, then, the resistance of the first switching contact can be determined. With this, the usual measuring devices can be used to carry out the process.
    [00022] According to another embodiment, the first measuring current and the second measuring current are set in such a way that a voltage drop across the first switching contact is equal to a voltage drop across the second switching contact. In this way, the symmetry described above can be produced, that is, it can be ensured that no voltage drop occurs through the earthing loop, and therefore no current flows through the earthing loop. In this way, the resistances of the first switching contact and the second switching contact are determined with high accuracy.
    [00023] Preferably, the first switching contact and the second switching contact are arranged adjacent in series connection of the switching contacts of the power switch.
    [00024] According to another embodiment, the power switch can have several pairs of switching contacts. A respective pair of switching contacts respectively comprises the first switching contact determined above and the second switching contact determined above, which are respectively arranged adjacent to each other. The procedure described above for measuring the resistance of the respective first switching contact and the second switching contact is carried out simultaneously with several pairs of adjacent first and second switching contacts of the power switch. Due to the different switching directions on the first and second switching contacts, in particular in the case of the symmetrical conditions described above, a total voltage across a pair of switching contacts is respectively zero. Therefore, several pairs of switching contacts do not influence each other during simultaneous measurement. Furthermore, also during a simultaneous measurement on several pairs of adjacent switching contacts, the voltage across the ground loop is zero, so that the measurement is not influenced by the grounding of the power switch. Due to the grounding on both sides of the power switch, in addition, a person carrying out the resistance measurement can be protected against unintentionally high voltages.
    [00025] As described above, the electrical power switch can comprise, for example, a high voltage, high voltage or medium voltage switch.
    [00026] According to the present invention, finally a device for measuring the resistances of switching contacts arranged in a series connection of an electrical power switch is prepared. The device comprises a first device for supplying a first measuring current in a first direction via a first switching contact of the switching contacts arranged in the series connection. The device furthermore comprises a second device for supplying a second measuring current in a second direction via a second switching contact of the switching contacts arranged in the series connection. The first direction and the second direction referring to the series connection are directed in opposition to the switching contacts. The first and second measuring currents are supplied, while the series connection is grounded on both sides. Furthermore, the device comprises a processing unit, which can be coupled with the first and second devices as well as with the power switch. The processing unit sets a first resistance value of the first switching contact as a function of the first measuring current, while the first and second switching contacts are closed. The processing unit can determine, for example, a voltage drop across the first switching contact, and as a function of the first measuring current, via the first switching contact can determine the resistance value of the first closed switching contact. Since the first measuring current and the second measuring current flow in opposite directions through the series connection of the switching contacts in the power switch, provided that the resistances of the first and second switching contacts are essentially of the the same size, or that the measuring currents are chosen appropriately, across the first switching contact according to the value, the same voltage drops as across the second switching contact. The voltage directions, however, are directed in reverse, such that, through the ground loop, which is constituted by the ground on both sides of the series connection, there is no voltage and therefore no current flows through. of the ground loop. In this way the resistance measurement is not influenced by the ground loop.
    [00027] The present invention will be explained below with reference to the attached drawing, with the aid of preferred embodiments.
    [00028] Figure 1 shows a test environment with an electrical power switch grounded on both sides, and with a device for measuring a resistance of a power switch switching contact according to an embodiment of the present invention.
    [00029] Figures 2 to 4 show test environments with devices for measuring resistances of switching contacts of electrical power switches according to another embodiment of the present invention.
    [00030] Figure 1 shows a test environment 10 with a power switch 11, which connects a first high voltage conductor 12 optionally with a second high voltage conductor 13, or separates from it. The test environment 10 further comprises a first grounding pad 14, which is coupled to a first side of the power switch 11, and a second ground pad 15, which is coupled to a second side of the power switch 11 By grounding on both sides of the power switch it can be ensured that there are no dangerous high voltages in the power switch 11. In addition, the test environment 10 comprises a micro-ohm measuring device 17, which is coupled to both sides of the power switch 11 via four connections 24 to 27. The power switch 11 comprises an electrical switching contact 16, which can optionally be opened or closed by means of a control drive 19, and a coupling 18 mechanical, in order to produce or break a connection between conductors 12 and 13. The control drive 19 can be controlled, for example, through a control conductor 28, in order to open or close the switching contact 16. In addition, the control drive 19 can be manually controlled or actuated by an operator, in order to optionally open or close the switching contact 16.
    [00031] The device 17 comprises a resistance measuring device, which comprises a current source 23 and a voltage meter 22. The current source 23 applies a current I through the connections 24, 25 by means of the power switch 11, and the ground 14, 15 bilateral, and the voltage meter 22 registers through the connections 26, 27 a voltage drop V by means of the power switch 11. The device 17 further comprises a processing unit 20 which , as a function of the current I applied by the current source 23, and the voltage V measured by the voltage meter 22 calculates a resistance through the power switch 11. In addition, the processing unit 20 is coupled to a control unit 21 of the device 17, which via connection 28 controls the control drive 19 of the power switch 11. Thereby, the processing unit 20 is in the situation of optionally opening or closing the switching contact 16. ho of device 17 will be described below.
    [00032] The power switch 11 is grounded with the aid of the grounding grommets 14 and 15. The resistance measuring devices 22.23 are, as shown in Figure 1, connected to the power switch 11, in such a way that a resistance can be measured by means of power switch 11. Then two resistance values are determined, one after the other. A resistance value R1 is determined with switching contact 16 closed, and a resistance value R2 is determined with switching contact 16 open. Therefore, the resistance value R1 corresponds to a parallel connection of the resistance of the switching contact 16 and the earthing loop through the earthing trims 14 and 15, and the resistance value R2 corresponds only to the resistance of the earthing loop through of the earthing fittings 14 and 15. Using the equation described above, the resistance of the closed switching contact 16 can be calculated from these two resistance values. This is carried out by the processing unit 20. In addition, the processing unit 20 can optionally open or close the switching contact 16 via the control unit 21, and therefore the two series resistance measurements then take one time. switching contact 16 open and switching contact 16 closed once, and then calculate the resistance of switching contact 16 closed from this. A sequence, in which the two strength measurements are taken, is preferred. Alternatively, the processing unit 20 may instruct a user, via a corresponding announcement, to open or close the switching contact 16 manually or via a corresponding trigger device, if an automatic control is not provided via the control unit. 21 and connection 28. Since the entire measurement of the power switches 11 is grounded on both sides it can be ensured that there are no dangerous high voltages at the power switch 11.
    [00033] Figure 2 shows another test environment 50 with a power switch 51, which comprises two switching contacts 56 and 57. The switching contacts 56 and 57 are arranged in a series connection. The power switch 51 may comprise further switching contacts, which together with switching contacts 56 and 57 are arranged in a series connection. Switching contacts 56 and 57, and other possibly existing switching contacts, in general are optionally opened or closed at the same time by means of a setting drive not shown. The power switch 51 is coupled to high voltage lines 52 and 53, which can optionally be connected or separated via switching contacts 56 and 57. In addition, the test environment 50 comprises two grounding fittings 54 and 55, as which connect the high voltage lines 52 and 53 with earth. Furthermore, in the test environment 50 a device 58 is shown for measuring the resistance of the switching contacts 56 and 57. The device 58 comprises a first resistance measuring unit comprising a voltage meter 60 and a source of current 61, as well as a second resistance measuring unit, comprising a strain gauge 66 and a current source 67. The first resistance measuring device 60, 61 is connected to the first switching contact 56 via connections 62 at 65, such that a current I1 from the current source 61 can be applied through the switching contact 65, if the switching contact 56 is closed. The voltage meter is connected to the switching contact 56 via connections 64 and 65, in such a way that a voltage drop U1 can be measured via the switching contact 56. The second resistance measuring device 66, 67, comparable to the first resistance measuring device 60, 61, is coupled to switching contact 57 via connections 68 to 71, for applying a current I2 via the closed switching contact 57, and measuring a voltage drop U2 via the contact. switch 57. A processing unit 59 is connected to the resistance measuring devices 60, 61 or 66, 67. The way of working of the device 58 will be described below.
    [00034] The high voltage lines 52 and 53, which are connected to the two ends of the power switch 51, are connected through the grounding fittings 54, 55 to earth. As described above, device 58 is connected to switching contacts 56 and 57. Switching contacts 56 and 57 are closed. A current I1 is applied by the current source 61 on the high voltage line 52. Therefore, the current I1 passes partly as current IS1 from left to right through the closed switching contact 56, and partly as current IE1. through the ground trim 54 to the ground. The current source 67 applies a current I2 over the high voltage line 53. The current I2 passes in part as current IS2 from right to left, through the closed switching contact 57, and in another part as current IE2 through the 55 grounding trim to earth. Due to the through resistance of the switching contact 56, a voltage drop U1 occurs across the switching contact 56. Likewise, due to the through resistance of the switching contact 57, a voltage drop U2 occurs through the switching contact. 57. Since the currents IS1 and IS2 are fed backwards, the voltage drops U1 and U2 are likewise driven backwards. When the through resistances of the switching contacts 56 and 57 are essentially equal and, furthermore, the currents I1 and I1 are essentially equal, the voltage drops U1 and U2 are likewise equal in value. As a result, the voltage drop UE across the ground loop is equal to zero, such that the currents IE1 and IE2 are respectively zero. In this case, via the switching contact 56, the current IS1 corresponds to the current I1 such that the through resistance of the switching contact 56 can be determined solely as a function of the current I1 and the voltage U1 measured by the resistance measurement 60 In the same way, the through resistance of the closed switching contact 57 can only be determined with the aid of the current I2, which in this case corresponds to the current IS2, and the voltage U2 measured by the voltage meter 66. Since the contacts switches 56 and 57 are generally constructed in the same way, and are subject to an equal load, they generally have an equal through-resistance in the closed state, such that the conditions described above are met, and for that. so-called symmetric case, a simple and exact determination of the through resistances is possible. The processing unit 59 can determine and output the corresponding resistance values with the aid of information from the resistance measuring devices 60, 61 and 66, 67. In the case where, the through resistances of the switching contacts 56 and 57 are of different size, the control device 59 can adjust the currents I1 and I2 such that the voltage drops U1 and U2 are essentially equal in value. In this way it is obtained that, also in this non-symmetrical case, the UE voltage across the earthing loop is essentially zero, and with this, the through resistance of the individual switching contacts 56 and 57 can be determined with the aid of the current I1 or I2 and voltage drops U1 or U2.
    [00035] Figure 3 shows another test environment 50, which corresponds, in essence, to the test environment 50 of Figure 2, and in addition comprises two additional power switches 72 and 73, which are arranged in parallel with the switching contacts 56 and 57. In this way it is obtained that, also with switching contacts 56 and 57 open, a current can be activated through the earthing loop, which is carried out through the earthing fittings 54 and 55, in order to be able to calculate the ground loop resistance. The earthing loop resistance can then be used for the correction of resistance values, which are calculated with the switching contacts 56, 57 closed. Expressed in another way, with the aid of switches 72, 73 also in the case of the arrangement shown in Figure 3, the process described in context with Figure 1 can be carried out. For example, switch 73 can be closed and switch 72 can be open. A micro-ohm measurement of the switching contact 56 can then be carried out with the aid of the resistance measuring device 60, 61, as described above with reference to Figure 1. In the case of switch 72 closed and switch 73 open , with the aid of the resistance measuring device 66, 67 a micro-ohm measurement can be carried out at the switching contact 57 as described above with reference to Figure 1.
    [00036] Figure 4 shows a test environment 50, which corresponds, in essence, to the test environment 50 of Figure 2. Additionally, the test environment 50 of Figure 4 comprises a third grounding trim 74, which couples a point between the first switching contact 56 and the second switching contact and the switching contact 57 to earth. In the case of this arrangement, with the aid of the resistance measuring device 60, 61 a micro-ohm measurement of the switching contact 56 can be carried out, as described above with reference to Figure 1. Likewise, with the aid of the device of resistance measurement 66, 67 a micro-ohm measurement of switching contact 57 can be performed as described above with reference to Figure 1. The two micro-ohm measurements of switching contacts 56 and 57 can be performed at the Same time. Furthermore, by means of this additional ground 74 it can be ensured that even between switching contacts 56 and 57 there is no high voltage.
    权利要求:
    Claims (22)
    [0001]
    1. A method for measuring a resistance of a switching contact (16) of an electrical power switch (11), comprising - determining a first resistance value via the power switch (11) while the power switch (11) is grounded on both sides and the switching contact (16) is closed, characterized in that the process further comprises - determination of a second resistance value through the power switch (11), while the power switch (11) is earthed on both sides and the switching contact (16) is open, and - determination of the resistance of the switching contact (16) closed as a function of the first resistance value and the second resistance value.
    [0002]
    2. Process according to claim 1, characterized in that the determination of the first and second resistance values, respectively, comprises - applying a direct current to the power switches (11) grounded on both sides, and - measuring of a voltage via the power switch (11).
    [0003]
    3. Process according to claim 1 or 2, characterized in that the power switch (11) comprises a three-phase switch, with at least one switching contact coordinated to each phase.
    [0004]
    4. Process according to any one of the preceding claims, characterized in that the process is carried out simultaneously for several switching contacts of the power switch.
    [0005]
    5. Process according to any one of the preceding claims, characterized in that the power switch (11) comprises a maximum voltage, high voltage or medium voltage switch.
    [0006]
    6. Device (17) for measuring a resistance of a switching contact (16) of an electrical power switch (11), comprising - a resistance measuring device (20, 22, 23) which is configured to determine a first resistance value through the power switch (11), while the power switch (11) is grounded on both sides and the switching contact (16) is closed, characterized in that the device further comprises - a control unit (21) for controlling the electrical power switch (11) in order to selectively open or close the switching contact (16) of the power switch (11), the resistance measuring device ( 20, 22, 23) can be coupled with the control unit (21) and is configured to determine a second resistance value via the power switch (11), while the power switch (11) is grounded on both sides and the switching contact (16) is open, and stops determine the resistance of the closed switching contact (16) as a function of the first resistance value and the second resistance value.
    [0007]
    7. Device (17) according to claim 6, characterized in that the device (17) is configured to carry out the process as defined in any one of claims 1 to 5.
    [0008]
    8. Test environment for measuring a resistance of a switching contact (16) of an electrical power switch (11), characterized in that it comprises - the power switch (11), - a device (17) , as defined in claim 6 or 7, - a first grounding pad (14), which can be coupled to the power switch (11) for the grounding of a first side of the power switch (11), and - a second pad. grounding device (15), which can be coupled to the power switch (11) for grounding a second side of the power switch (11).
    [0009]
    9. Process for measuring the resistances of switching contacts, arranged in a series connection, of an electrical power switch, characterized in that it comprises - supplying a first measuring current (IS1) in a first direction via a first switching contact (56) of the switching contacts arranged in the series connection, - supply of a second measuring current (IS2) in a second direction via a second switching contact (57) of the switching contacts arranged in the connection in series, the first direction and the second direction being oppositely directed with respect to the series connection of the switching contacts, with the first and second measuring current (IS1, IS2) being supplied simultaneously, while the series connection is grounded on both sides, and - determination of a resistance value of the first switching contact (56) as a function of the first measuring current (IS1), while the first and second switching contact (56, 57) are closed.
    [0010]
    10. Process according to claim 9, characterized in that it further comprises - determining a resistance value of the second switching contact (57) as a function of the second measuring current (IS2), while the first and second contact switches (56, 57) are closed.
    [0011]
    11. Process according to claim 10, characterized in that, during the determination of the resistance values of the first and second switching contacts (56, 57), the switching contacts (56, 57) of the power switch (51) are closed.
    [0012]
    12. Process according to claim 10 or 11, characterized in that the determination of the resistance values of the first and second switching contact (56, 57) comprises - measuring a first voltage (U1) through the first contact switching (56), and - measuring a second voltage (U2) via the second switching contact (57).
    [0013]
    13. Process according to any one of claims 9 to 12, characterized in that the first and second measuring current (IS1, IS2) are supplied, while the electrical power switch (51) is grounded on both sides.
    [0014]
    14. Process according to any one of claims 9 to 13, characterized in that the first measuring current (IS1) and the second measuring current (IS2) are adjusted in such a way that a voltage drop (U1) across of the first switching contact (56) is equal to a voltage drop (U2) across the second switching contact (57).
    [0015]
    15. Process according to any one of claims 9 to 14, characterized in that, in series connection, the first switching contact (56) is arranged adjacent to the second switching contact (57).
    [0016]
    16. Process according to any one of claims 9 to 15, characterized in that the power switch (51) comprises several pairs of switching contacts, one pair of switching contacts comprising, respectively, a first contact of switching and a second adjacent switching contact, the process being carried out simultaneously on several pairs of adjacent switching contacts of the power switch (51).
    [0017]
    17. Process according to any one of claims 9 to 16, characterized in that the power switch (51) comprises a maximum voltage, high voltage or medium voltage switch.
    [0018]
    18. Device for measuring the resistances of switching contacts, arranged in a series connection, of an electrical power switch, characterized in that it comprises - a first device (61) for supplying a first measuring current ( IS1) in a first direction via a first switching contact (56) of the switching contacts arranged in series connection, - a second device (67) for supplying a second measuring current (IS2) in a second direction via of a second switching contact (57) of the switching contacts arranged in the series connection, the first direction and the second direction being oppositely directed with respect to the series connection of the switching contacts (56, 57), the first and the second measuring current (IS1, IS2) are supplied simultaneously, while the series connection is grounded on both sides, and - a processing unit (59), which can be coupled to the first and to the second device (60, 67) and is configured to determine a first resistance value of the first switching contact (56) as a function of the first measuring current (IS1), while the first and second switching contacts (56, 57 ) are closed.
    [0019]
    19. Device according to claim 18, characterized in that the first switching contact (56) and the second switching contact (57) is connected in parallel, respectively, with a switch (72, 73).
    [0020]
    20. Device according to claim 18 or 19, characterized in that a first earthing collar (54) is connected with the first switching contact (56) and a second earthing collar (55) is connected with the second switching contact (57).
    [0021]
    21. Device according to claim 20, characterized in that a third grounding trim (74) is connected to a point between the first switching contact (56) and the second switching contact (57).
    [0022]
    22. Device according to any one of claims 18 to 21, characterized in that the device (58) is configured to carry out the process, as defined in any one of claims 9 to 17.
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    CA2824263A1|2014-02-24|
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    法律状态:
    2015-06-16| B03A| Publication of a patent application or of a certificate of addition of invention [chapter 3.1 patent gazette]|
    2018-11-21| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-12-31| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-03-30| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-05-18| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 22/08/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP12006040.5|2012-08-24|
    EP12006040.5A|EP2700962B1|2012-08-24|2012-08-24|Measurement of a resistance of a switch contact of an electrical circuit breaker|
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