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EP-4741844-A2 - SYSTEM AND METHOD AND HIGH VOLTAGE TEST SIGNAL DEVICE FOR A MULTI-FUNCTIONAL TEST OF A HIGH VOLTAGE DEVICE

EP4741844A2EP 4741844 A2EP4741844 A2EP 4741844A2EP-4741844-A2

Abstract

A test system (10) for multifunctional testing of a high-voltage device (30) comprises a high-voltage test signal device (200), a measuring device (160), and a control device (180). The high-voltage test signal device (200) can be operated, controlled by the control device (180), in a loss factor mode for loss factor testing of the high-voltage device and in an insulation resistance mode for insulation resistance testing of the high-voltage device, so that both tests can be performed with one and the same test system.

Inventors

  • RÄDLER, Michael
  • KAUFMANN, REINHARD

Assignees

  • Omicron electronics GmbH

Dates

Publication Date
20260513
Application Date
20231218

Claims (8)

  1. Test system (10) for a multifunctional test of a high-voltage device (30) which has a primary side and a secondary side electrically isolated therefrom, wherein the test system (10) comprises a high-voltage test signal device (200), a measuring device (160) and a control device (180), wherein the high-voltage test signal device (200) comprises: a high-voltage signal source (270) which is configured to generate an alternating voltage as well as a direct voltage, a high-voltage connection (231; 232) for connecting the high-voltage device (30), a current sensor device (292) configured to detect an electric current flowing through the high-voltage terminal (231; 232), and a high-voltage sensor device (260) which is configured to detect an electrical voltage applied to the high-voltage terminal (231; 232), wherein the high-voltage test signal device (200) is operable in a loss factor mode for loss factor testing of the high-voltage device and in an insulation resistance mode for insulation resistance testing of the high-voltage device, wherein the high-voltage test signal device (200) is configured to apply the AC voltage to the high-voltage terminal in the loss factor mode and the DC voltage in the insulation resistance mode, and wherein the control device (180) is set up: - to operate the high-voltage test signal device in loss factor mode for the loss factor test and to determine a loss factor of the high-voltage device (30) using the measuring device (160) based on the current detected by the current sensor device (292), and - to operate the high-voltage test signal device in insulation resistance mode for the insulation resistance test and to use the measuring device (160) based on the reading from the to determine the DC insulation resistance of the high-voltage device (30) based on the current detected by the current sensor device and the voltage detected by the high-voltage sensor device (260), wherein the high-voltage test signal device (200) has a measuring terminal (236, 237) and a further voltage sensor device (296) which is configured to detect an electrical voltage applied to the measuring terminal (236, 237), wherein the high-voltage test signal device (200) is operable in a transformation ratio mode for a transformation ratio test of the high-voltage device (30), for which the primary side of the high-voltage device (30) is to be connected to the high-voltage terminal (231, 232) and the secondary side of the high-voltage device (30) is to be connected to the measuring terminal (236, 237), wherein the high-voltage test signal device (200) is configured to generate the alternating voltage in the conversion ratio mode by means of the high-voltage signal source (270) and to apply it to the high-voltage connection (231, 232), and wherein the control device (180) is configured to operate the high-voltage test signal device (200) in the ratio mode for ratio testing and to determine a ratio of the high-voltage device (30) by means of the measuring device (160) on the basis of the voltage detected by the high-voltage sensor device (260) and on the basis of the voltage detected by the further voltage sensor device (296), which is present on the secondary side of the high-voltage device (30) and thus on the measuring terminal as a result of the alternating voltage applied to the primary side of the high-voltage device (30), characterized in that the high-voltage device (30) is a voltage transformer, wherein the high-voltage test signal device (200) can still be operated in an extended transmission ratio mode, and wherein the control device (180) is set up for an extended transmission ratio test the high-voltage test signal device (200) in to operate the extended conversion ratio mode in order to cause the high-voltage test signal device (200) to generate an alternating voltage by means of the high-voltage signal source (270) which has at least two frequency components with different RMS values, and to determine, by means of the measuring device (160), a characteristic map of conversion ratios of the high-voltage device (30) as a function of the frequency components and their RMS values, based on the voltage detected by the high-voltage sensor device (260) and on the voltage detected by the further voltage sensor device (296).
  2. Test system (10) according to claim 1, wherein the high-voltage capable signal source (270) comprises a high-voltage transformer for generating the alternating voltage.
  3. Testing system (10) according to claim 2, wherein the high-voltage test signal device (200) comprises switching means (280) that can be controlled automatically by the control device and a rectifier device (250) with a first (251) and a second (252) input terminal, wherein the high-voltage signal source (270) is configured to generate the alternating voltage between a first and a second node (271, 272) and/or to rectify the alternating voltage by means of the rectifier device (250) and to provide it as the direct voltage between a third (273) and a fourth node (274), and wherein the control device (180) is set up: - for the loss factor test using the controllable switching means (280) to electrically detachably connect the first node (271) to a first high-voltage connection (231) of the test system and the second node (272) to a second high-voltage connection (232) of the test system (10), as well as to electrically disconnect the first and second input connections of the rectifier device (250) from the first and second nodes (271, 272) and to electrically disconnect the third and fourth nodes (273, 274) from the first and second high-voltage connections (231, 232), and - for the insulation resistance test using the controllable switching means (280) to electrically disconnect the first and second nodes (271, 272) from the first and second high-voltage terminals (231, 232) respectively, and to electrically detachably connect the first input terminal of the rectifier device (250) to the first node (271) and the second input terminal of the rectifier device (250) to the second node (272), and to electrically detachably connect the third node (273) to the first high-voltage terminal (231) and the fourth node (274) to the second high-voltage terminal (232).
  4. Test system (10) according to one of the preceding claims, wherein the high-voltage sensor device (260) for detecting an alternating voltage applied to the high-voltage connection (231, 232) comprises a current sensor (262) and a high-voltage capacitor (264) connected in series with a specific capacitance.
  5. Test system (10) according to one of the preceding claims, wherein high-voltage device (30) comprises an inductor with a magnetizable core, wherein the high-voltage test signal device (200) can still be operated in a magnetizing current mode for magnetizing current testing, wherein the high-voltage test signal device (200) is configured to apply the alternating voltage to the high-voltage terminal (231, 232) and thus to the inductance of the high-voltage device (30) in the magnetizing current mode, and wherein the control device (180) is configured to operate the high-voltage test signal device (200) in the magnetizing current mode for the magnetizing current test and to determine a magnetizing current for the detected voltage by means of the measuring device (160) on the basis of the current detected by the current sensor device (292) and on the basis of the voltage detected by the high-voltage sensor device (260).
  6. Test system (10) according to one of the preceding claims, wherein the test system (10) is equipped with the high-voltage test signal device (200), the The measuring device (160) and the control device (180) are designed in the form of a portable test device.
  7. Test system (10) according to one of the preceding claims, comprising: a portable main unit (100) with a housing (140) and a connection assembly (120) arranged thereon, and a portable accessory device with a separate housing (240) and a connection arrangement (220) attached to it, wherein the portable main unit (100) comprises the measuring device (160), the control device (180) and a power amplifier device (102) for generating a power signal, wherein the portable auxiliary device comprises the high-voltage test signal device (200) and the portable main device (100) and the portable auxiliary device can be connected to each other via their connection arrangements (120, 220), and wherein the portable main unit (100) is configured to generate, controlled by the control unit (180), a control signal for testing the high-voltage device (30) and, by means of the power amplifier unit, a corresponding power signal and to transmit it via the connection arrangements (120, 220), and to receive a measurement signal, which designates the detected currents and voltages, via the connection arrangements (120, 220) from the high-voltage test signal device (200).
  8. Method for a multifunctional test of a high voltage device (30) using a test system (10), wherein the high-voltage device (30) has a primary side and a secondary side electrically isolated therefrom, and wherein the high-voltage device (30) is connected to the test system (10) for the purpose of carrying out the test, and wherein the method comprises the following steps which are carried out automatically by the test system (10): - Generating an alternating voltage by the test system (10) and applying the alternating voltage to the high-voltage device (30), - Detecting an alternating electric current flowing through the high-voltage device (30) as a result of the alternating voltage, - Determining a loss factor based on the measured alternating current, - Generating a DC voltage by the test system (10) and applying the DC voltage to the high-voltage device (30), - Detecting a direct current flowing through the high-voltage device (30) as a result of the direct voltage, and - Determining the DC insulation resistance of the high-voltage device (30) based on the measured DC current and DC voltage, wherein the method is carried out with the testing system (10) according to one of claims 1-7.

Description

AREA OF INVENTION The invention lies in the field of high-voltage measurement technology and relates in particular to a test system for a multifunctional test of a high-voltage device, a high-voltage test signal device therefor, and a method therefor. BACKGROUND In electrical power supply networks, high-voltage equipment such as power transformers or switchgear—especially gas-insulated switchgear—is typically used to convert and distribute electrical energy. Other high-voltage equipment, such as high-voltage or high-current transformers—for example, for measuring voltages and currents occurring in a power grid—circuit breakers, and power generators are also commonly used. Such high-voltage equipment, or other high-voltage equipment such as electric (power) motors, is also used in industrial settings. For the purposes of this invention, "high voltage" refers to voltages on the order of at least 1 kV, so that "high-voltage equipment" is understood to mean equipment operating at such a high voltage. For the commissioning or maintenance of systems with such high-voltage equipment, it may be necessary to check its functions and properties. For example, the insulation material of a high-voltage device—such as a high-voltage current transformer, a high-voltage voltage transformer, or a circuit breaker—can be checked by measuring its DC resistance. A loss factor of a Measurements can be taken of high-voltage equipment – such as a power transformer or a rotating machine, e.g., a generator or an electric motor – which can also provide information about the quality of existing insulating materials or fluids. Partial discharge measurements can also be performed. Such measurements are particularly relevant because insulating materials – such as the oil in a transformer – can age, and consequently, regular inspection may be necessary to ensure the operational safety of the high-voltage equipment. Such measurements are frequently carried out in the field – for example, outdoors or in an industrial environment. The equipment used should therefore be lightweight, especially for field use, and robust enough for transport to the respective site. The US 2017 / 016 949 A1 , the WO 2021 / 140 211 A1 , the WO 2021 / 228 841 A1 and the JP S62 55571 A Each of the test systems described is for multifunctional testing of high-voltage equipment with primary and secondary sides, comprising a high-voltage signal source and a measuring device. Both loss factor testing and insulation resistance testing can be performed by switching between the corresponding operating modes. SUMMARY OF THE INVENTION There is therefore a need to improve the testing of functions and properties of high-voltage equipment, and in particular to simplify the handling of a test system and a high-voltage test signal device for it, to facilitate their transport and to make the procedure more efficient and/or safer. This problem is solved according to the invention by a testing system having the features of claim 1 and a testing method having the features of claim 8. solved. The dependent claims define preferred and/or advantageous embodiments of the invention. The present invention makes it possible to combine both a loss factor test or tan/delta test and an insulation resistance test as high-voltage measurements in just one test system, so that both tests can be carried out without rewiring. A first aspect of the invention relates in particular to a test system for the multifunctional testing of a high-voltage device. Such a high-voltage device to be tested has a primary side with one or more primary terminals and a secondary side electrically isolated therefrom, with one or more secondary terminals. The test system comprises a high-voltage test signal device, a measuring device, and a control device. The high-voltage test signal device comprises a high-voltage signal source configured to generate an alternating voltage as well as a direct voltage with a correspondingly high voltage value. For the purposes of this invention, "high voltage" refers to voltages on the order of at least 1 kV. Furthermore, the high-voltage test signal device comprises at least one high-voltage connection for connecting the high-voltage device, a current sensor for detecting an electric current flowing through the at least one high-voltage connection, and a high-voltage sensor for detecting an electric voltage applied to the high-voltage connection. The high-voltage test signal device is operable in at least one loss factor mode for loss factor testing of the high-voltage equipment and in an insulation resistance mode for insulation resistance testing of the high-voltage equipment. In loss factor mode, the high-voltage test signal device applies the AC voltage to the at least one high-voltage terminal, while in insulation resistance mode, the The high-voltage test signal device applies a DC voltage to at least one high-voltage terminal. The control unit is configured to operate the hi