• 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:
    A device for measuring the electrical potential of the inner conductor in an encased high-voltage switching mechanism filled with a gaseous insulator includes an active, capacitive voltage divider. One capacitor of the voltage divider is located within the grounded metal casing of the switching mechanism and is connected with an input terminal of an amplifier. The amplifier is supplied with power from the inner conductor and has a feedback path including the second capacitor of the voltage divider. In order to accurately perform voltage measurements independent of the pressure and temperature of the insulator within the casing, the feedback capacitor is also installed inside the metal casing. This arrangement enables the ratio of the capacitances of the two capacitors, which determines the quality of the voltage measurement, to remain constant over a large pressure and temperature range.
    公开号:SU980638A3
    申请号:SU792745298
    申请日:1979-03-21
    公开日:1982-12-07
    发明作者:Зигенталер Андреас
    申请人:Ббц Аг Браун,Бовери Унд Ко (Фирма)；
    IPC主号:
    专利说明:

    My influence of the parasitic insulating capacitances and the G2 connecting cable. However, the constancy of the ratio of the capacitors of the divider, which determines the measurement accuracy, depends in this device on the pressure and temperature of the gaseous insulating substance. In this connection, in practical application of the device, again, significant deviations of the measurement results from the true values of the monitored voltage are observed. The purpose of the invention is to improve the accuracy of measurement of alternating voltage. The goal is achieved by the fact that in a device for measuring an alternating voltage in a cell of a high-voltage switchgear containing a grounded metal housing filled with a gaseous insulating substance, a high-voltage capacitor with a high-voltage electrode that is the current conductor of the cell and a measuring electrode mounted on an insulator a low-voltage capacitor connected to a high-voltage capacitor and inserted into the feedback circuit of an amplifier connected With a cable entry with a measuring electrode high voltage capacitor, a power amplifier unit, a low voltage is kondensatbr voltage branch meth votrubchatom
    one of the electrodes of the low voltage capacitor, which is simultaneously the measuring electrode of the high voltage capacitor, is provided with a hole, and its mounting insulator is annular, forming together with the metal case plate the blind flange of the tubular branch, and the power supply unit of the amplifier is implemented using placed inside a metal casing of a series-connected additional high-voltage capacitor associated with a conductor whose and, a transformer and the transformation coefficient greater than unity.
    The drawing shows a general view of the device, a section (ne | ependicular to the longitudinal axis of the conductor of the pre-device cell).
    The drawing shows schematically only the amplifier and its power supply.
    权利要求:
    Claims (2)
    [1]
    flange for tubular branch 13. Cylinder 3 through bushing H and shielded cable 15 is connected to preamplifier 16. Cylinder 6 through bushing 17 and shielded cable 18 is connected to the secondary winding of adjustable transformer 19, turned on after TB preamplifier and ungrounded transformer 20. Preamplifier 1b and transformers 19 and 20 are components of an amplifier 21. The power supply unit 22 of amplifier 21 includes an additional high-voltage capacitor 23 placed in a metal case 2 transformer, 2h and zener diode 25, as well as external diodes 26 and 27 located outside the housing 2 and smoothing capacitors 28 and 29. The secondary transformer 25 transformer 25 connected to the rectifier assembly was passed through the passage., insulators 30 and 31. and the recording device for the sake of simplification is not shown. / The conductor 1 is introduced into a grounded metal case 2 of the switchgear cell filled with an insulating gaseous substance, such as gas. The conductor 1 is a high-voltage electrode, and the metal cylinder 3, together with the cylindrical segment C, is a measuring electrode, of a high-voltage capacitor 5. The measuring electrode and the metal cylinder 6 constitute a low voltage capacitor 7. Both electrodes of the latter are made rotationally symmetrical with respect to an axis that runs perpendicular to the longitudinal axis of the conductor 1. The cylindrical structures of the electrodes have different diameters and face each other with their ends, which are provided with closed ring 1 erasable recesses 8, designed so that the cylinder with a smaller diameter without contact pushed into a cylinder with a larger diameter. Both cylinders are installed by means of a disk 9 and a ring - ;;, 10 first insulators, which, in turn, are fixed on the plate 11 of the metal housing 2. In the cylinder 3, having a larger diameter, an opening 12 is made, through which the insulating gas can enter recesses 8 and out of them. Insulator 10 serves as a blind closing 59 The device operates as follows. The current drawn by the high voltage capacitor 5 is compensated for by the low voltage capacitor 7 introduced into the feedback circuit of the amplifier 21. In this connection, the voltage at the input of the latter is close to zero. After amplification in the preamplifier 16, the secondary winding of the non-earthed transformer 20 applies a voltage U2, which is approximately the same as the measured voltage U (C and C capacitors of the high capacitor 5 for the voltage and 7 for the voltage). The parasitic capacitances of the insulation and the connecting cable 18 do not affect the measurement result, since there is no voltage due to the feedback. The separation of the installation isolator into a disk 9 and an annular 10 part further helps to prevent dissipation fields from the electrode to the electrode. Both capacitors of the voltage divider consist almost exclusively of gas. The geometrical dimensions of gas sections with fluctuations in temperature and pressure remain practically constant, and the change in the dielectric constant of gas in both capacitors occurs almost identically. In this connection, the gear ratio C2 / C of the device remains in any case unchanged and no distortion of the measurement results in the working temperature and pressure ranges is observed. Reducing the gear ratio and, at the same time, simplifying the construction of the low voltage capacitor 7 is due to the fact that the transformer 19 supplies the capacitor 7 with a voltage that repeatedly (e.g. ten times) exceeds the voltage Uj. In this case, the transformer 19 is controlled until the voltage U2 corresponds to the established transformation ratio. Apparatus of the Invention A device for measuring an alternating voltage in a cell of a high-voltage switchgear, comprising a grounded metal housing filled with a gaseous insulating substance, a high-voltage capacitor with a high-voltage electrode, which is the current conductor of the cell, and a measuring electrode mounted on an insulator — a low-voltage capacitor connected in series with a high voltage capacitor and an amplifier inserted in the feedback circuit, connected to the input with a cable a high voltage capacitor electrode, an amplifier power supply unit, so that, in order to improve the measurement accuracy, a low voltage capacitor is located in the tubular branch of the metal case, one of the low voltage capacitor electrodes which is at the same time the measuring voltage of the high-voltage capacitor, is provided with a hole, and its mounting insulator is made ring-shaped, forming together with the metal body plate the blind flange of the tubular branching, and the power supply unit of the amplifier is implemented using an additional high-voltage capacitor arranged inside the metal case in series, connected to the cell conductor, and a transformer with a transformation ratio greater than one. Sources of information taken into account in the examination 1. Schwab A. Measurements at high voltage. M., Energie, 1973, p. 59-60.
    [2]
    2.Groenenboom M., Spoorenberg H.A.J.M. The ESPOM and capacitor conpled electronic voltage transformer. Smit Nijmegen Electrotechnische Fabrieken N.V., 1969, No. 4, S t. Fig 1. S.9, Fig 9 (prototype). r9 ff
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    同族专利:
    公开号 | 公开日
    DE2816647C2|1987-04-02|
    US4240031A|1980-12-16|
    HU180696B|1983-04-29|
    DE2816647A1|1979-09-27|
    NL7902191A|1979-09-25|
    CH627853A5|1982-01-29|
    JPS5554444A|1980-04-21|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE4133936A1|1991-10-14|1993-04-15|Sachsenwerk Ag|Indicator unit for displaying voltage condition of HV network - has dual signal input from independent capacitor couplings and logic evaluation of signals for self monitoring visual indication of state|
    US5432438A|1991-06-29|1995-07-11|Asea Brown Boverti Ltd.|Combined current and voltage transformer for a metal-enclosed gas-insulated high-voltage switching station|GB1058890A|1964-12-03|1967-02-15|Int Research & Dev Co Ltd|Improvements in and relating to methods of measuring voltage|
    DE2215928B2|1972-03-29|1975-10-30|Siemens Ag, 1000 Berlin Und 8000 Muenchen|Voltage measuring device for a fully insulated, metal-enclosed high-voltage switchgear|
    DE2313478C3|1973-03-15|1982-11-11|Siemens AG, 1000 Berlin und 8000 München|Voltage converter for a fully insulated high-voltage switchgear with multiple conductors|
    DE2363932C3|1973-12-20|1979-11-29|Siemens Ag, 1000 Berlin Und 8000 Muenchen|Combined current and voltage measuring device|
    DE2409595B2|1974-02-25|1978-06-22|Siemens Ag, 1000 Berlin Und 8000 Muenchen|Voltage converter for a fully insulated, metal-enclosed high-voltage switchgear|
    DE2428906A1|1974-06-14|1976-01-02|Siemens Ag|Measuring system for currents in high-voltage conductor - has high-frequency transfer circuit between high-voltage and low-voltage side|
    FR2328968B1|1975-10-23|1982-11-19|Merlin Gerin|US4388929A|1980-12-11|1983-06-21|Vitafin N.V.|Programmable pacer and method of external programming|
    CH663672A5|1982-06-25|1987-12-31|Bbc Brown Boveri & Cie|VOLTAGE CONVERTER ON A METAL-ENCLOSED, INSULATING GAS-FILLED HIGH-VOLTAGE SWITCHGEAR.|
    DE68907979T2|1988-04-22|1993-11-11|Matsushita Electric Ind Co Ltd|Current and / or voltage detector for a distribution system.|
    DE4104921A1|1991-02-18|1992-08-20|Asea Brown Boveri|Metal-clad gas-insulated HV switchgear - has reference electrode set into opening of cladding for capacitive measurement of partial discharges at points along rod insulator|
    DE4414828C2|1994-04-28|1997-08-07|Abb Patent Gmbh|High voltage converter|
    DE19507934C2|1995-02-24|1997-08-07|Siemens Ag|Voltage converter with increased dielectric strength|
    DE19713916B4|1997-04-04|2014-08-28|Abb Schweiz Ag|Capacitive voltage converter for a metal-enclosed, gas-insulated high-voltage system|
    DE10056988A1|2000-11-17|2002-05-23|Kg Ritz Messwandler G M B H &|Voltage divider arrangement employing capacitors has measurement amplifier supplied by separate capacitor section of divider of tubular design|
    US6529013B2|2001-05-31|2003-03-04|Mcgraw-Edison Company|Three-phase voltage sensor with active crosstalk cancellation|
    US6717395B2|2001-05-31|2004-04-06|Mcgraw-Edison Company|Current transformer based high voltage measurement apparatus|
    EP3884284A1|2018-11-20|2021-09-29|3M Innovative Properties Company|End plug sensor device with voltage divider and test point features|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CH320678A|CH627853A5|1978-03-23|1978-03-23|DEVICE FOR MEASURING THE VOLTAGE OF AN AC CONDUCTIVE CORNER OF AN INSULATED, ENCLOSED HIGH VOLTAGE SWITCHGEAR.|
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