WO2016166050A1 - Transformateur, dispositif d'essai et procédé d'essai d'un objet en essai d'une installation électrotechnique - Google Patents

Transformateur, dispositif d'essai et procédé d'essai d'un objet en essai d'une installation électrotechnique Download PDF

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Publication number
WO2016166050A1
WO2016166050A1 PCT/EP2016/057895 EP2016057895W WO2016166050A1 WO 2016166050 A1 WO2016166050 A1 WO 2016166050A1 EP 2016057895 W EP2016057895 W EP 2016057895W WO 2016166050 A1 WO2016166050 A1 WO 2016166050A1
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WO
WIPO (PCT)
Prior art keywords
transformer
conductor
test
core
transformer core
Prior art date
Application number
PCT/EP2016/057895
Other languages
German (de)
English (en)
Inventor
Mark Campbell
Original Assignee
Omicron Electronics Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Omicron Electronics Gmbh filed Critical Omicron Electronics Gmbh
Publication of WO2016166050A1 publication Critical patent/WO2016166050A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/10—Single-phase transformers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/004—Arrangements for interchanging inductances, transformers or coils thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings

Definitions

  • Embodiments of the invention relate to transformers and test devices comprising such transformers. Embodiments relate in particular to transformers. Test devices and test methods that allow the injection of high currents into a test sample.
  • Transformers may have a configuration in which primary and secondary windings are wound around an iron core. Also known are transformers having on a high current side only a bus bar or another conductor which is passed through the center of the iron core. In conventional transducers, the iron core typically has an approximately square cross-section. A distance between the bus bar and the iron core is often relatively large. Such conventional designs may have the disadvantage that their design adversely affects a leakage inductance of the transformer.
  • transformer stations or circuit breakers by a test in which one or more characteristic characteristics are determined, may require the imprinting of a relatively high current.
  • a very specific current must be impressed into a test object.
  • a current of more than a hundred amperes, z. B. from several hundred to several thousand amperes be impressed for a few seconds until the switch opens and so the correct operation of the switch can be checked.
  • a multiple of the rated current must be impressed to measure the protective current transformer under real conditions.
  • Such a test current can be generated in a DUT so that a transformer is placed very close to the DUT, so that the high current lines can be as short as possible. This has the effect that you only need very short high current cables, which are very heavy. Another effect is that the ohmic resistance, but also the inductance of the high-current circuit can be kept as small as possible and the required active power and the required apparent power to impress the current are not excessively large.
  • the transformer core may conform to the first conductor in the sense that a distance between the first conductor and the transformer core is smaller. as a length of the first conductor along the first direction.
  • the transformer core may have a length along the first direction that is at least three times as large as a distance between the first conductor and the transformer core.
  • the distance between the first conductor and the transformer core is conventionally defined as the minimum of all distances between any point on the surface of the first conductor and any point on the surface of the transformer core.
  • the transformer core may have a length along the first direction which is at least five times, in particular at least ten times, as large as a distance between the first conductor and the transformer core.
  • the transformer core may alternatively or additionally along the direction have a length which is greater than a thickness of the transformer core in a second direction orthogonal to the first direction.
  • the transformer core may have a length along the direction that is greater than three times the thickness of the transformer core in the second direction orthogonal to the first direction.
  • the transformer can be used in particular for generating high currents in test methods.
  • the transformer may have an output for connection to a device under test.
  • the transformer may have an interface for connection to a tester.
  • a transformer includes a transformer core, a high current side having a first conductor extending along a first direction, and at least one second conductor being wound around the transformer core.
  • the transformer core has a length along the first direction that is at least three times as large as a distance between the first conductor and the transformer core.
  • the distance between the first conductor and the transformer core is conventionally defined as the minimum of all distances between any point on the surface of the first conductor and any point on the surface of the transformer core.
  • the length of the transformer core may be at least five times, in particular at least ten times, as large as a distance between the first conductor and the transformer core. By using such an elongate transformer core fitted with the first conductor, the stray inductance of the transformer can be kept small.
  • the length of the transformer core along the first direction may be at least three times as large as a thickness of the transformer core along a second direction orthogonal to the first direction.
  • the length of the transformer core along the first direction may be at least three times as large as a further thickness of the transformer core along a third direction that is orthogonal to the first direction and the second direction.
  • the first conductor can be straight.
  • the first conductor may extend straight along the first direction through the transformer core.
  • the first conductor may extend along a straight line in the first direction through the transformer core. At least one segment of the first conductor pierced through the transformer core may be rectilinear.
  • the first conductor may include a bus bar that extends linearly along the first direction through the transformer core.
  • the length of the transformer core may be at least five times the thickness of the transformer core along the second direction.
  • the first conductor may be removably mounted non-destructively.
  • the transformer may have at least one holder for the first conductor, which is set up for a non-destructively detachable receptacle of the first conductor.
  • the transformer may include at least one spare conductor which is non-destructively mountable by the transformer core.
  • the replacement conductor may be arranged to replace the first conductor non-destructively.
  • the replacement conductor may differ in its conducting properties from the first conductor.
  • the spare conductor may have a different resistance from the first conductor.
  • a winding of the at least one second conductor may be potted.
  • the first conductor, the transformer core and the at least one second conductor may be potted.
  • the transformer can be cast as a whole.
  • the transformer core may be an iron core.
  • the transformer core may be a tape core.
  • the transformer core may be a ribbon core.
  • the transformer core can not have an air gap.
  • the transformer core can be designed so that it has only a small air gap.
  • a distance between the first conductor and the transformer core may be less than a threshold, for example, less than one third of the length of the transformer core along the first direction and / or less than the thickness of the transformer core along the second direction.
  • the at least one second conductor may comprise a plurality of second windings.
  • the transformer may include a switching arrangement configured to selectively switch the plurality of second windings in series or in parallel.
  • the switching arrangement may comprise a plurality of controllable switches.
  • the controllable switches may be electrically controllable switches.
  • the switching arrangement may be controllable to selectively connect only one winding of the plurality of second windings to a source and to selectively connect a series or parallel connection of the plurality of second windings to the source.
  • the switching arrangement may be connected between the source and the plurality of second windings.
  • the transformer may include a controller for controlling the switching arrangement.
  • the transformer core can be composed of a plurality of core segments.
  • the transformer may be adapted for releasable connection to a device under test for impressing a test signal.
  • the transformer may include terminals for electrically connecting the first conductor to a primary side of the device under test.
  • the transformer may have an interface for connection to a tester.
  • a test device for a test specimen of a power plant is given according to a further embodiment.
  • the test apparatus comprises the transformer according to an embodiment.
  • the test device can be designed as a mobile test device, in particular as a portable test device.
  • the test device may include a tester.
  • the transformer may be configured for detachable connection to the tester.
  • the transformer can be set up to impress a test signal.
  • the tester may be configured to detect a test response.
  • the test object may be a circuit breaker of a power plant, substation, power grid or other station or substation of high energy equipment.
  • the test object may be a converter of a power plant, of a substation, of an energy supply network or of another station or substation of a plant of high energy technology.
  • a system includes the device under test and the test device according to an embodiment connected to the device under test.
  • a method for testing a device under test of a power plant is given according to a further embodiment.
  • the method becomes Test signal for the test specimen produced using a transformer.
  • the transformer includes a transformer core, a high current side having a first conductor extending along a first direction, and at least one second conductor wound around the transformer core, the transformer core having a length along the first direction that is at least three times is as large as a distance between the first conductor and the transformer core.
  • the distance between the first conductor and the transformer core is conventionally defined as the minimum of all distances between any point on the surface of the first conductor and any point on the surface of the transformer core.
  • the length of the transformer core may be at least five times, in particular at least ten times, as large as a distance between the first conductor and the transformer core.
  • the stray inductance of the transformer can be kept small.
  • the length of the transformer core along the first direction may be at least three times as large as a thickness of the transformer core along a second direction orthogonal to the first direction.
  • test specimen tested by the method may be a circuit breaker of a power plant, substation, power grid or other station or substation of high energy equipment.
  • test specimen tested by the method may be a converter of a power plant, substation, power grid or other station or substation of high energy equipment.
  • the method may be performed by the transformer or the test apparatus according to an embodiment.
  • Devices, systems and methods according to embodiments allow the impressing of test signals with high currents using a Transformer whose transformer core is elongated along the first conductor of the high current side.
  • the leakage inductance of the transformer can be kept small or at least well-defined.
  • the required apparent power for the test, which is performed with a tester, is thereby reduced.
  • Devices, systems and methods of embodiments may be used to test a large number of samples, e.g. of protective transformers, circuit breakers or other equipment of power plants, substations, transformer stations or power supply networks.
  • FIG. 1 shows a system with a test device according to an exemplary embodiment.
  • Figure 2 shows a sectional view of a transformer according to an embodiment.
  • FIG. 3 shows a plan view of a transformer according to an exemplary embodiment.
  • FIG. 4 shows a plan view of a transformer according to an exemplary embodiment.
  • Figure 5 shows a plan view of a transformer according to an embodiment.
  • FIG. 6 shows a plan view of a transformer according to an exemplary embodiment.
  • FIG. 7 shows a sectional view of a transformer according to an embodiment.
  • FIG. 8 shows a test device according to an exemplary embodiment.
  • FIG. 9 shows a test device according to an exemplary embodiment.
  • FIG. 10 shows a test device according to an exemplary embodiment.
  • Figure 1 1 shows a test device according to an embodiment.
  • FIG. 12 shows an equivalent circuit diagram of the transformers according to exemplary embodiments.
  • FIG. 13 is a flowchart of a method according to an embodiment. DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS
  • the test object may be a protective transformer or circuit breaker for high or medium voltage networks.
  • the test object may be a test object installed in a power plant or substation.
  • the transformers and test devices may each be mobile devices that allow the test to be performed on the installed test sample.
  • the transformer has a configuration in which the transformer core extends along a first conductor of a high current side of the transformer.
  • the transformer core may have a length greater than a distance between the first conductor and the transformer core along a first direction in which the first conductor extends linearly.
  • the transformer core may have a length which is at least three times, in particular at least five times, more advantageously at least ten times. times, is as large as the distance between the first conductor and the transformer core. In this way, the transformer core can cling to the first conductor in an elongated manner in order to keep the stray inductance on the high-current side of the transformer small.
  • a distance between the first conductor and the transformer core may be relatively small compared to the length of the transformer core to keep the stray inductance on the high current side small.
  • One or more second conductors may be wrapped around the transformer core. The one or more second conductors may extend through the gap between the first conductor and the transformer core.
  • the transformer core along the first direction in which the first conductor extends linearly may have a length greater than a thickness of the transformer core in a second direction orthogonal to the first direction, for example, at least three times the thickness.
  • FIG. 1 shows a system 1 according to an exemplary embodiment which comprises a test object 2 and a test device 9 connected to the test object 2 according to an exemplary embodiment.
  • the test object 2 may be, for example, a circuit breaker or protective transformer.
  • the test object 2 may comprise a transducer to detect a current with at least one winding 4.
  • the test object 2 may comprise a triggering control 5, which operates a switch 3 depending on the inductively detected current.
  • the test apparatus 9 comprises a transformer 10, which will be described in more detail below.
  • the test device 9 may include a test device 30, which may be formed separately from the transformer 10.
  • the transformer 10 may also be structurally integrated into the test device 30.
  • the transformer 10 may be configured as a mobile device, in particular as a portable device.
  • the transformer 10 may have a housing 1 9.
  • the transformer 10 includes a first conductor 11, a transformer core 13, and at least one second conductor 12.
  • the at least one second conductor 12 includes one or more windings wound on the transformer core 12.
  • the first conductor 1 1 forms the high-current side of the transformer 10. This is understood to mean the side at which higher current intensities are present during operation.
  • the high-current side is the side in which higher currents are present during operation than on a low-current side, which is formed by the at least one second conductor 12.
  • the first conductor 1 1 can extend straight through the transformer core 1 3.
  • the first conductor 1 1 may be a busbar.
  • the direction in which the first conductor 1 1 extends through the transformer core 3 is referred to as the first direction.
  • the transformer 10 is designed in such a way that the transformer core 13 has a length which is greater, in particular at least three times, along the first direction in which the first conductor 11 extends is as large or at least five times as large as a distance between the first conductor 1 1 and the transformer core 1 3.
  • the distance between the first conductor 1 1 and the transformer core 1 3 can be defined in a conventional manner as the minimum of all distances between any point on the surface of the first conductor 1 1 and any point on the surface of the transformer core 1 3.
  • the distance between the first conductor 1 1 and the transformer core 13 is thus the distance between the surface of the first conductor 1 1 and the surface of the transformer core 1 3, at the point where the surface of the first conductor 1 1 and the surface of the transformer core 1 third come closest.
  • the distance between the transformer core 1 3 and the first conductor 1 1 may be selected to be small compared to the length of the transformer core 1 3 along the first direction in order to achieve the lowest possible stray inductance on the high-current side.
  • the length of the transformer core 13 along the first direction in which the first conductor 1 1 extends may be larger, in particular at least three times as large or at least five times as large as a thickness of the transformer core 13.
  • the transformer 1 1 has output terminals 21, 22 to connect the transformer 1 1 with the DUT 2.
  • the transformer 1 1 can be positioned close to the test specimen 2 for carrying out the test in order to keep losses, in particular active and / or apparent losses, low during the test.
  • an alternating signal is fed into the at least one second conductor 12.
  • a source coupled to the at least one second conductor 12 may be integrated into the housing 19 of the transformer 10.
  • the source may also be provided separately from the transformer 10.
  • the transformer 10 in this case has input terminals 23, 24 for connection to the source.
  • the source may be integrated with a tester 30, as described in more detail below.
  • the testing device 30 may have connections 31, 32 for connection to the test piece 2.
  • the switching behavior of a circuit breaker can be detected as a test response, a voltage drop across the test object 2 in response to the test signal can be determined, or another parameter can be detected on the test object 2.
  • the tester 30 may include an electronic processing device 36 configured to evaluate the test response.
  • the processing device 36 may comprise one or more semiconductor integrated circuits.
  • the processing device 36 may include one or more of a custom application specific circuit (ASIC), a processor, a microprocessor, a controller, a microcontroller, or a combination thereof.
  • ASIC application specific circuit
  • the processing device 36 may be configured to process a test response detected via the terminals 31, 32. For example, a switching operation of the test object can be detected. Alternatively or additionally, a voltage or a current in the test object 2, which is caused by the test signal, can be evaluated.
  • the processing means 36 may be arranged to process the check response to verify that the DUT 2 satisfies at least one predetermined request. For example, the processing device 36 can automatically check whether the test specimen 2 triggers at a certain current.
  • the processing device 36 can determine a transmission ratio of a protective converter and compare this with characteristics for the device under test 2.
  • the processing of the test response may include comparison with characteristics for the test object.
  • the parameters can be stored non-volatile in a memory of the test device 30.
  • a source 35 is connected to the at least one second conductor 12.
  • the source 35 may be a power source or a voltage source.
  • the source 35 may include a current measuring device or may be connected in series with a current measuring device to perform current regulation of the output current of the source 35.
  • the source 35 may be provided in the transformer 10, in the tester 30, or separately from the transformer 10 and the tester 30.
  • the test apparatus 30 may include output terminals 33, 34 for connection to the input terminals 23, 24 of the transformer 10.
  • the input terminals 23, 24 are conductively connected to the at least one second conductor 12.
  • a switching arrangement with at least one controllable switch may be connected between the input terminals 23, 24 and the at least one second conductor 12.
  • the transformer 10 in the embodiment illustrated in FIG. 1 is a modular device that can be used in combination with a tester 30 to test DUTs 2 when high current test signals are required.
  • the transformer 10 may be used to test a circuit breaker that trips only at a current greater than the maximum output current of the tester 30.
  • the specific embodiment of the transformer 10 according to embodiments, which will be described in more detail with reference to Figure 2 to Figure 3, has, inter alia, the effect that the control of the test is facilitated.
  • apparent power on the feed side, ie, during operation of the source 35 can be reliably adjusted.
  • the transformer 10 may have a low stray inductance at least at the high current side.
  • Figure 2 is a sectional view of the transformer 1 0.
  • the transformer core 1 3 has a length 41 in the first direction corresponding to the longitudinal direction of the first conductor 1.
  • the transformer 0 has a thickness 42 in a second direction orthogonal to the first direction (vertical direction in the sectional view of FIG. 2).
  • the thickness 42 may be smaller than the length 41.
  • the length 41 may be at least three times as large as the thickness 42.
  • the length 41 may be at least five times the thickness 42.
  • the transformer core 13 may thus be elongated along the first direction corresponding to the longitudinal direction of the first conductor 11 be.
  • the transformer core 1 3 hugs the first conductor 1 1.
  • a distance 46 between the first conductor 1 1 and the transformer core 13 may be smaller than a threshold value.
  • the distance 46 may be set to be at most equal to one third of the length 41 of the transformer core 1 3 along the first direction.
  • the transformer core 13 may have a length 41 which is at least three times as large, in particular at least five times as large or at least ten times as large as the distance 46 between the first conductor 1 1 and the transformer core 13.
  • the distance 46 may be smaller than the thickness 42 of the transformer core 1 1.
  • the distance 46 may be defined as the minimum of all distances between any point on the surface of the first conductor 11 and any point on the surface of the transformer core 13.
  • FIG. 3 is a plan view of the transformer 10 according to an embodiment.
  • the first direction in which the first conductor 1 1 extends through the transformer core 1 1, is perpendicular to the plane of Figure 3.
  • the transformer core 1 3 has a thickness 42 along the second direction (horizontal direction in the plan view of FIG. 3).
  • the transformer core 13 has another thickness 43 along a third direction (vertical direction in the plan view of FIG. 3) that is orthogonal to the first direction and the second direction on.
  • the further thickness 43 may be equal to the thickness 42 or may be different from the thickness 43.
  • the thickness 42 and the further thickness 43 may be the same.
  • the at least one second conductor 12 comprises a plurality of windings.
  • a winding 14 and a further winding 15 may be provided so that they do not have to be acted upon simultaneously with a feed current.
  • the winding 14 and a further winding 1 5 may be provided so that either by only one or both of the windings 14, 15, a feed current can be performed.
  • a switching arrangement with at least one controllable switch between the source 35 and the plurality of windings 14, 15 may be provided.
  • the length 41 of the transformer core 1 1 perpendicular to the plane of Figure 3 may be at least three times as large, in particular at least five times as large or at least ten times as large as the distance 46 between the first conductor 1 1 and the transformer core thirteenth
  • Figure 4 is a plan view of the transformer 10 according to an embodiment.
  • the first direction in which the first conductor 1 1 extends through the transformer core 1 1, is perpendicular to the plane of Figure 4.
  • the thickness 42 and the further thickness 43 may be different.
  • the length 41 of the transformer core 1 3 along the first direction may be at least three times as large as the smaller one of the thicknesses 42, 43.
  • the length 41 of the transformer core 1 3 along the first direction may be at least five times as large as the smaller one of the thicknesses 42, 43.
  • the length 41 of the transformer core 1 3 along the first direction may be at least three times as large as the larger of the thicknesses 42, 43.
  • the length 41 of the transformer core 13 along the first direction may be at least five times greater than the larger of the thicknesses 42, 43.
  • the length 41 of the transformer core 1 1 perpendicular to the plane of Figure 4 may be at least three times as large, in particular at least five times as large or be at least ten times as large as the distance 46 between the first conductor 1 1 and the transformer core. 3
  • the transformer core 13 may be configured so that it has no air gap.
  • the transformer core 1 3 can be designed so that it has a small air gap.
  • FIG. 5 is a plan view of the transformer 10 according to an embodiment.
  • the first direction in which the first conductor 1 1 extends through the transformer core 1 1, is perpendicular to the plane of Figure 5.
  • the transformer core 13 has an air gap 44.
  • the air gap 44 has a width 45.
  • the width 45 may be small, for example smaller than the thickness 42 of the transformer core 1 3.
  • the transformer core 1 3 may be implemented as a so-called “split-core" consisting of a plurality of parts Such an embodiment is shown by way of example in FIG.
  • FIG. 6 is a plan view of the transformer 10 according to an embodiment.
  • the first direction in which the first conductor 1 1 extends through the transformer core 1 1 is perpendicular to the plane of the drawing of Figure 6.
  • the transformer core 1 3 is designed as a so-called "split core.”
  • the transformer core 1 3 comprises a first segment 16 and at least one second segment 17.
  • the first segment 16 and the at least one second segment 17 are joined together to form the transformer core 13. While a two-part transformer core 13 is shown in Figure 6, the transformer core 1 3 may also consist of more than two Be formed.
  • FIG. 7 is a sectional view of the transformer 10.
  • the first direction in which the first conductor 1 1 extends through the transformer core 13 lies in the plane of the drawing.
  • the transformer 10 may be partially or fully encapsulated.
  • the transformer 10 may include an encapsulation 18 surrounding at least a portion of the transformer core 13 and at least a portion of the at least one second conductor 12.
  • the encapsulation 18 may completely enclose the windings of the at least one second conductor 12 which are wound around the transformer core 13, apart from the connection wires.
  • the encapsulation may also enclose at least a part of the first conductor 1 1.
  • the encapsulation 18 may consist of a plastic.
  • the encapsulation 18 may consist of a potting material.
  • the encapsulation 18 may be made by a casting process to partially or completely shed the transformer 10.
  • FIG. 8 shows a test device 9 according to an exemplary embodiment.
  • the transformer 10 may have any of the configurations described with reference to FIGS. 1 to 7.
  • the transformer 10 is designed so that the first conductor 1 1 is interchangeable.
  • the housing 19 of the transformer 10 may be configured such that the first conductor 1 1 can be removed from the housing 19 in a non-destructive manner.
  • the housing 19 of the transformer 10 may be configured so that the first conductor 1 1 can be removed from the housing 19 without the housing 19 or the first conductor 1 1 must be partially destroyed for this purpose.
  • the transformer 10 may be configured to allow replacement of the first conductor 11.
  • the transformer 10 may include a replacement conductor 51 which is insertable into the housing 19 in place of the first conductor 11.
  • the replacement conductor 51 may be configured identically to the first conductor 1 1. This allows, for example, a replacement of the first conductor 11 during wear.
  • the replacement conductor 51 may differ from the first conductor 11 in at least one electrical parameter, for example its resistance.
  • the replacement conductor 51 may be made of a material hen, which is different from a material of the first conductor 1 1.
  • the replacement conductor 51 may alternatively or additionally have a cross-sectional area that is different from a cross-sectional area of the first conductor 11.
  • the housing 1 9 may have a holder 52 for the first conductor 1 1.
  • the holder 52 may be configured to allow a non-destructive removal of the first conductor 1 1 from the holder 52.
  • the bracket 52 may be configured to allow non-destructive insertion of the spare conductor into the holder 52 so that the spare conductor 51 extends through the transformer core 13.
  • An embodiment with an exchangeable first conductor allows adaptation to different test pieces.
  • the first conductor 1 1 can be replaced when worn.
  • FIG. 9 shows a test device 9 according to an exemplary embodiment.
  • the transformer 10 may have any of the configurations described with reference to FIGS. 1 to 8.
  • the transformer 10 is configured such that the at least one second conductor comprises a plurality of second windings 14, 15.
  • a switching arrangement 61 is connected between the source 35 and the plurality of second windings.
  • the switching arrangement 61 can be integrated in the transformer 10 or in the test device 30.
  • the switching arrangement 61 may be configured to selectively switch the plurality of second windings in series or in parallel.
  • the switching arrangement 61 may be controllable to selectively connect only one winding of the plurality of second windings 14, 15 to the source 35 and to selectively conduct a series or parallel connection of the plurality of second windings 14, 15 to the source 35 connect to. In this way, a feed-in current can be selectively fed into only one or a combination of a plurality of windings of the plurality of second windings 14, 15. The flexibility in generating high current test signals is increased.
  • the switching arrangement 61 may comprise a plurality of controllable switches.
  • the controllable switches may be electrically controllable switches.
  • Each of the controllable switches may each be a relay or other switch adapted to switch a load circuit under the control of a control circuit.
  • the controllable switches may each be an insulated gate bipolar transistor (IGBT) or a field effect transistor (FET), or may comprise an IGBT or a FET.
  • IGBT insulated gate bipolar transistor
  • FET field effect transistor
  • the plurality of controllable switches may include at least one switch configured to separate one of the plurality of second windings 14, 15 from the source 35.
  • the plurality of controllable switches may include at least one further switch configured to interconnect the plurality of second windings 14, 15 in series or in parallel.
  • a controller 62 may be associated with the switch assembly 61 to control the switch assembly 61.
  • the controller 62 may include one or more semiconductor integrated circuits.
  • the controller 62 may include one or more of a custom application specific circuit (ASIC), a processor, a microprocessor, a controller, a microcontroller, or a combination thereof.
  • ASIC application specific circuit
  • the control device 62 can be installed in the test device 30 or in the transformer 10.
  • the controller 62 may be configured for data communication with the tester 30 via an interface 63 of the transformer.
  • the interface 63 can be set up for communication with a corresponding interface 37 of the test device 30.
  • the interfaces 63, 37 may be digital interfaces.
  • the interfaces 63, 37 may be arranged to allow communication between the processing device 36 of the tester 30 and the controller 62 of the transformer 10.
  • FIG. 10 shows a test device 9 according to an exemplary embodiment.
  • the transformer 10 may have any of the configurations described with reference to FIGS. 1 to 9.
  • the transformer 10 includes a current measuring device 63.
  • the current measuring device 63 is configured to detect a current intensity of the current flowing through the first conductor 1 1 current.
  • the current measuring device 63 may be an ammeter, a defined section on a bus bar, which serves as a shunt, or a current transformer.
  • a current detected by the current measuring device 64 can be reported by the transformer 10 via an interface 63 to the tester 10.
  • the processing device 36 of the tester 30 may control the source 35 depending on the detected current level. In this way, a regulation of the output current of the transformer 10 can be implemented.
  • FIG. 1 1 shows a test device 9 according to an embodiment.
  • the test device 9 is designed as a device, which may be in particular a portable device.
  • the test apparatus 9 comprises the transformer 10, which may have any of the embodiments described with reference to FIGS. 1 to 10.
  • On the housing 39 both outputs 2, 22 are provided for impressing the current flowing through the first conductor 1 into the specimen 2 as well as inputs 31, 32 for detecting a test response.
  • the source 35 for generating the feed current for the transformer 10 is also provided in the housing 39 of the test apparatus 9.
  • a switching arrangement 61 (not shown in FIG. 11) may be provided between the source 35 and the at least one second conductor 14, 15.
  • FIG. 12 is an equivalent circuit diagram of a transformer 10 according to an exemplary embodiment.
  • the at least one second conductor 12, to which a current is fed into the transformer 10 for generating the test signal, has an ohmic resistor 71.
  • the first conductor 1 1, which is conductively connected during operation with the device under test 2, has an ohmic resistance 74.
  • the test piece 2 has a resistor 76.
  • the transformer 10 has a leakage inductance 72 on the low-current side and a leakage inductance 74 on the high-current side, which encompasses the first conductor 11.
  • FIG. 1 is a flow chart of a method 80 according to an exemplary embodiment.
  • the method 80 may be automatically performed by the tester 9 to test a circuit breaker, breaker, or other high voltage or medium voltage test sample.
  • the test device 9 is detachably connected to the test piece 2.
  • a user input may be received by the reviewer 9.
  • the user input allows a test procedure to be selected.
  • the user input can specify which test item should be checked.
  • the user can specify whether several second windings of the plurality of second windings 14, 15 are combined in a series or parallel circuit.
  • step 83 it may be checked whether a test signal of high amperage is to be generated for testing.
  • the check may be made depending on the user input received at step 81.
  • the verification can be a database query whether it is automatically determined whether the transformer 10 is required for impressing a test signal with high amperage.
  • the check can also be made dependent on a test response. For example, if a test response in response to a test signal generated without the transformer 10 indicates that a circuit breaker is not yet triggered, the transformer 10 may be selectively employed to generate a sufficiently high current level of the test signal. If an increase in the current intensity of the test signal through the transformer 10 is not required, the process may continue at step 85. If an increase in the current intensity of the test signal through the transformer 10 is required, the process may proceed to step 84. At step 84, the transformer 10 may be used to generate a high current test signal. For this purpose, a source which can be integrated into the test apparatus 30 or into the transformer 10 can be controlled in order to feed an infeed signal into the at least one second conductor 12. Optionally, the switching arrangement 61 may be controlled to selectively combine a plurality of second windings 14, 15 in series or parallel connection.
  • a test response may be evaluated.
  • the evaluation of the test response may include the determination of a current at which a circuit breaker trips, the determination of a transmission ratio of a protective transformer or another transducer or the determination of other characteristics.
  • the test device may be disconnected from the sample. There may be an automatic further evaluation and / or archiving of the results of the test of the test specimen by the test apparatus.
  • transformers, devices, and methods of embodiments may also be used for other samples or other applications. While in embodiments a test procedure involving the determination of one or more characteristics of the device under test may be carried out automatically, the transformers, devices and methods of embodiments may also be used if only one characteristic of the device under test is measured before a new user input is required.
  • the transformers, devices and methods according to embodiments can also be used in other energy-related equipment.
  • transformers, devices, and methods of embodiments can be achieved with transformers, devices, and methods of embodiments.
  • the stray impedance on a high-current side of the transformer, with which a test signal is impressed into the test object, is kept low.
  • the required apparent power in carrying out the test can be reduced.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

Pour tester un objet en essai (2), on a recours à un transformateur (10). Le transformateur (10) comprend un noyau de transformateur (13), un côté haute intensité pourvu d'un premier conducteur (11) qui s'étend dans une première direction, et au moins d'un deuxième conducteur (12) qui est enroulé autour du noyau de transformateur (13). Le noyau de transformateur (13) a, dans la première direction, une longueur correspondant à au moins trois fois la distance séparant le noyau de transformateur (13) du premier conducteur (11).
PCT/EP2016/057895 2015-04-14 2016-04-11 Transformateur, dispositif d'essai et procédé d'essai d'un objet en essai d'une installation électrotechnique WO2016166050A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108693418A (zh) * 2018-04-02 2018-10-23 西南交通大学 一种大型卷铁心退火效果的测评方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768011A (en) * 1970-06-09 1973-10-23 W Swain Means for measuring magnitude and direction of a direct current or permanent magnet, including clip-on direct current sensing inductor
DE2712064A1 (de) * 1977-03-15 1978-09-21 Siemens Ag Strommesseinrichtung
EP0350255A1 (fr) * 1988-07-07 1990-01-10 Dulmison Pty. Limited Circuit de transformateur
DE4229681A1 (de) * 1992-09-02 1994-03-03 Siemens Ag Prüfvorrichtung zur Ermittlung des Übertragungsverhaltens von Stromwandlern
DE19941169A1 (de) * 1999-08-30 2001-03-01 Abb Research Ltd Stromsensor
DE102011101480A1 (de) * 2011-05-13 2012-11-15 Ean Elektroschaltanlagen Gmbh Wandlertester und Verfahren zum Testen eines Durchsteckstromwandlers
US20150091558A1 (en) * 2013-09-27 2015-04-02 Ge Aviation Systems Llc Apparatus for high bandwidth current sensing

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768011A (en) * 1970-06-09 1973-10-23 W Swain Means for measuring magnitude and direction of a direct current or permanent magnet, including clip-on direct current sensing inductor
DE2712064A1 (de) * 1977-03-15 1978-09-21 Siemens Ag Strommesseinrichtung
EP0350255A1 (fr) * 1988-07-07 1990-01-10 Dulmison Pty. Limited Circuit de transformateur
DE4229681A1 (de) * 1992-09-02 1994-03-03 Siemens Ag Prüfvorrichtung zur Ermittlung des Übertragungsverhaltens von Stromwandlern
DE19941169A1 (de) * 1999-08-30 2001-03-01 Abb Research Ltd Stromsensor
DE102011101480A1 (de) * 2011-05-13 2012-11-15 Ean Elektroschaltanlagen Gmbh Wandlertester und Verfahren zum Testen eines Durchsteckstromwandlers
US20150091558A1 (en) * 2013-09-27 2015-04-02 Ge Aviation Systems Llc Apparatus for high bandwidth current sensing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108693418A (zh) * 2018-04-02 2018-10-23 西南交通大学 一种大型卷铁心退火效果的测评方法
CN108693418B (zh) * 2018-04-02 2019-07-12 西南交通大学 一种大型卷铁心退火效果的测评方法

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