WO2008052495A1 - Method and arrangement for measuring the voltage on a conductor - Google Patents
Method and arrangement for measuring the voltage on a conductor Download PDFInfo
- Publication number
- WO2008052495A1 WO2008052495A1 PCT/DE2006/001922 DE2006001922W WO2008052495A1 WO 2008052495 A1 WO2008052495 A1 WO 2008052495A1 DE 2006001922 W DE2006001922 W DE 2006001922W WO 2008052495 A1 WO2008052495 A1 WO 2008052495A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage
- measuring
- measuring device
- transfer function
- undervoltage
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
- G01R15/06—Voltage dividers having reactive components, e.g. capacitive transformer
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2513—Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
Definitions
- the invention relates to a method having the features according to the preamble of claim 1.
- a measuring method with a capacitive voltage divider and a suitable measured value correction door is known from German Offenlegungsschrift DE 103 46 356 A1.
- the voltage on a conductor is measured by means of a measuring arrangement which has a capacitive divider coupled to the conductor and a measuring device.
- the voltage at the lower voltage terminal of the capacitive divider whose upper voltage terminal is connected to the conductor is measured to form a lower-voltage measured value.
- the measured undervoltage measurement value is corrected with a correction term which has an inverse transfer function for the transfer function of the measurement arrangement. Using the correct After the undervoltage measured value, a measured value indicative of the voltage at the conductor is then formed.
- the invention has for its object to further develop a method of the type described in such a way that it is particularly easy to carry out.
- the invention provides that a time constant of the transfer function of the measuring arrangement is determined based on the voltage at the lower voltage terminal for two different load conditions at the lower voltage terminal and the inverse transfer function is determined taking into account this time constant.
- a significant advantage of the method according to the invention is the fact that in this phase angle adjustment or a phase angle correction without an additional measurement of the capacitive divider actually applied primary voltage is possible, so that a phase angle adjustment very easily carried out during operation of the measuring device and in particular can be repeated during operation of the measuring arrangement.
- the method can be used to measure the voltage across a phase conductor of a power transmission line.
- the amplitude divider ratio of the capacitive divider is taken into account; This approach makes it possible to use the undervoltage value, the time constant and the amplitude divider ratio in the formation of the measured value, which makes possible a correction of the measured value in terms of magnitude and phase.
- the divider value is preferably determined by measuring the voltage at the upper voltage terminal to form a high-voltage measured value, and using the ratio between the high-voltage measured value and the lower-voltage measured value as a divider value.
- the determination of the divider value can for example be done once and be determined during the installation of the measuring arrangement.
- a phase angle correction can be performed more 'simple and therefore advantageous by a high-pass first order is used as the inverse transfer function.
- the inverse transfer function is formed in accordance with
- Tl denotes the determined time constant
- Tk a further freely selectable time constant
- K the transmission ratio of the measuring arrangement
- the freely selectable time constant is preferably chosen such that it coincides with the time constant at the current input of the measuring device.
- the time constant of the measuring device can be included in the phase angle correction.
- One of the two electrical load states can be formed, for example, by the internal resistance of the measuring device with which the voltage at the low-voltage connection is measured.
- the other of the two electrical load states can be formed, for example, by adding an additional electrical component to the internal resistance of the measuring device.
- an additional electrical component an additional resistor or an additional voltage source is preferably added.
- the additional electrical component is preferably connected to the internal resistance of the measuring device electrically in series or in parallel thereto.
- the time constant T1 of the transfer function of the measuring arrangement can be determined easily and thus advantageously according to, for example:
- the invention also relates to a measuring arrangement for measuring the voltage on a conductor, having a capacitive divider whose upper voltage terminal is connected to the conductor, and a measuring device which measures the voltage at the lower voltage terminal of the capacitive divider to form an undervoltage measurement value and the undervoltage measurement value a measured value indicative of the voltage at the conductor is formed, the measured undervoltage measured value being corrected to form the measured value with a correction element which has an inverse transfer function to the transfer function of the measuring arrangement.
- the object of the invention is to further develop such that a measured value correction can be carried out particularly easily.
- the measuring device is designed such that it is suitable to determine a time constant of the transfer function of the measuring arrangement based on the voltage at the Ünterwoodsan gleich for two different load conditions at Unterwoodsan- conclusion and the inverse transfer function taking into account this time constant thus determined to build.
- the measuring arrangement has a switchable electrical component which, when switched on, causes the other of the two electrical load conditions.
- the measuring device is equipped with an evaluation device for switching the load conditions and for forming the inverse transfer function.
- the switchable electrical component can for example form part of the measuring device and be controlled by the evaluation device for switching the load conditions.
- the switchable electrical component form part of a separate, connected to the measuring device calibration device and are controlled by the evaluation device for switching the load conditions.
- the measuring arrangement has a voltage measuring device for measuring the voltage at the upper voltage terminal in order to also allow a determination of the amplitude divider ratio of the capacitive divider, taking into account the undervoltage measurement value.
- the voltage measurement value of the voltage at the upper voltage connection is preferably fed into the evaluation device for further processing.
- the invention also relates to a measuring device for a measuring arrangement for measuring the voltage on a conductor, wherein the measuring device is adapted to measure the voltage at the lower voltage terminal of a capacitive divider to form an undervoltage measurement value and with the undervoltage measured value a measured value indicative of the voltage at the conductor form, wherein it corrected to form the measured value, the measured undervoltage measured value with a correction element having an inverse to the transfer function of the measuring arrangement transfer function.
- Such a measuring device is also known from the German patent application DE 103 46 356 Al.
- the object of the invention is to further develop it in such a way that a measured value correction can be carried out particularly easily.
- the measuring device is suitable for determining a time constant of the transfer function of the measuring arrangement on the basis of the voltage at the under voltage connection for two different load states at the lower voltage terminal and for forming the inverse transfer function taking into account this time constant itself.
- the invention also relates to a calibration device for a measuring arrangement.
- the calibration device has a control connection for connection to a measuring device
- the calibration device has a voltage measuring connection which is suitable for connection to a capacitive divider
- the calibration device has an output connection which is connected to the voltage measurement connection and to the connection is suitable for an external measuring device
- the control terminal is a switching element in connection, which is opened or closed in response to a control signal at the control terminal
- the switch element switchable electrical component for switching a load state between the voltage measuring terminal and the output terminal switchable is.
- FIG. 2 shows an electrical equivalent circuit diagram of the measuring arrangement for a first switching state of the calibration device according to FIG. 1,
- FIG. 3 shows an electrical equivalent circuit diagram of the measuring arrangement for a second switching state of the calibration device according to FIG. 1,
- FIG. 4 shows an exemplary embodiment of a digital filter for an evaluation device of the measuring device according to FIG. 1, FIG.
- Figure 5 shows a second embodiment of a measuring arrangement according to the invention with an embodiment of a measuring device according to the invention and with an embodiment of a calibration device according to the invention and
- FIG. 6 shows an electrical equivalent circuit diagram for a switching state of the calibration device according to FIG. 5.
- FIGS. 1 to 6 the same reference numerals are used for identical or comparable elements for the sake of clarity.
- FIG. 1 shows a first exemplary embodiment of a measuring arrangement 10.
- the measuring arrangement 10 has a capacitive divider 20, which is formed by a high-voltage capacitance C 0 and an undervoltage capacitance Cm.
- One of the two terminals of the upper voltage capacitor C 0 forms a high voltage terminal O20 of the capacitive divider 20; the other of the two terminals • the upper voltage capacitance C 0 forms an undervoltage terminal U20 of the ka ⁇ pazitiven divider 20.
- the lower voltage terminal U20 of the capacitive divider 20 is also connected to a terminal of the undervoltage capacitance Cm in connection, the other terminal, for example, to ground or another Potential lies.
- the upper voltage terminal O20 of the capacitive divider 20 is connected to a phase conductor 30 of an energy transmission line, not further shown, in order to enable a measurement of the conductor voltage U E at the phase conductor 30.
- the undervoltage terminal U20 of the capacitive divider 20 is connected to one end of a coaxial cable 40 which forms a capacitance C 02 electrically; this is electrically parallel to the undervoltage capacitance Cm.
- a calibration device 50 is connected to the other end of the coaxial cable 40, namely with its voltage measuring connection M50.
- an additional electrical component 60 is connected, which may be, for example, a resistor Rz.
- the electrical component 60 is also in communication with an output port A50 of the calibration device 50.
- FIG. 1 also shows a switching element 65 of the calibration device 50 whose switching connections are connected to the voltage measurement connection M50 and the output connection A50 and whose control connection is connected to a control connection S50 of the calibration device 50.
- the calibration device 50 is followed by a measuring device 70, which may be formed for example by a field or protective device.
- the measuring device 70 has an internal resistance Rki, to which an inductive converter 80, an A / D converter 90 and an evaluation device 100 are arranged downstream.
- the evaluation device 100 can be formed, for example, by a programmable microprocessor device in which one or more digital filters are implemented or implementable.
- the measuring arrangement 10 can be operated, for example, as follows:
- the switching element 65 of the calibration device 50 is successively offset by the evaluation device 100 in the following switching states Zl and Z2:
- FIGS. 2 and 3 For the two switching states Z1 and Z2, substitute circuit diagrams are thus produced, as shown in FIGS. 2 and 3; 2 shows the equivalent circuit diagram for the case that the switching element 65 is closed, and Figure 3 shows the equivalent circuit diagram in the event that the switching element 65 is open.
- R K2 denotes the resistance sum of the resistors Rz and R ⁇ i according to FIG.
- the sham solution resulting from the solution can be done either by a plausibility test with the solution estimates or by establishing the equation for another pair of calibration resistors R K.
- the solution that results in both cases is the right solution.
- the amplitude divider ratio V of the capacitive divider 20 together with the coaxial cable 40 can be determined via a comparison measurement.
- the current voltage amplitude Ü E at the phase conductor 30 is read by a display device of an additional voltage measuring device, which is at least temporarily present in the measuring arrangement 10 and not shown in FIG. 1 for reasons of clarity, and no further in the figures as reference value at an additional voltage measuring device shown, measured value input of the evaluation device 100 in this example, manually entered.
- the ⁇ se input can be made once and done, for example, during the initial installation of the measuring arrangement.
- a digital filter 110 is used, as in the FIG. 4 is shown by way of example.
- the function of the digital filter 110 consists in correcting the transfer function G of the measuring arrangement 10, which is determined by the capacitive divider 20, the coaxial cable 40, the calibration device 50 and the internal resistance R K i, and with the undervoltage measurement values U A i and U A2 at the output of the A / D converter 90 corrected measured values i (k) to form.
- the evaluation device 100 uses a correction transfer function G kOrr to be corrected for the transfer function G.
- the resulting correction transfer function results in a first order high pass with another, freely selectable characteristic time constant. This time constant is expediently adjusted so that it matches the characteristic time constant of the current input M70 of the measuring device 70.
- the following formula shows the resulting correction transfer function:
- T ⁇ indicates the selected speed constant
- K is the ratio of the measurement arrangement.
- the correction transfer function can be determined in the z-range in the following manner:
- the digital filter 110 thus has the following transfer function in the z range:
- FIG. 5 shows a second exemplary embodiment of a measuring arrangement 10, in which a voltage source 200 is used as additional electrical component 60.
- the resulting electrical equivalent circuit diagram is shown in FIG. 6.
- the input voltage ü E can be calculated with the following equation:
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DE2006/001922 WO2008052495A1 (en) | 2006-10-30 | 2006-10-30 | Method and arrangement for measuring the voltage on a conductor |
CN2006800562587A CN101535818B (en) | 2006-10-30 | 2006-10-30 | Method and arrangement for measuring the voltage on a conductor |
DE112006004041T DE112006004041A5 (en) | 2006-10-30 | 2006-10-30 | Method and device for measuring the voltage on a conductor |
HK09111351.1A HK1131441A1 (en) | 2006-10-30 | 2009-12-03 | Method and arrangement for measuring the voltage on a conductor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DE2006/001922 WO2008052495A1 (en) | 2006-10-30 | 2006-10-30 | Method and arrangement for measuring the voltage on a conductor |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008052495A1 true WO2008052495A1 (en) | 2008-05-08 |
Family
ID=38281955
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2006/001922 WO2008052495A1 (en) | 2006-10-30 | 2006-10-30 | Method and arrangement for measuring the voltage on a conductor |
Country Status (4)
Country | Link |
---|---|
CN (1) | CN101535818B (en) |
DE (1) | DE112006004041A5 (en) |
HK (1) | HK1131441A1 (en) |
WO (1) | WO2008052495A1 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010009235A1 (en) * | 2010-02-25 | 2011-08-25 | Feng, Yongxin, 89079 | Device for measuring interference voltages of high frequencies and low amplitudes in power electronic components of electrical systems, has measurement circuit whose transfer function is determined using parameter estimating algorithm |
WO2012069307A1 (en) * | 2010-11-24 | 2012-05-31 | Siemens Aktiengesellschaft | Measurement and/or voltage conversion device |
EP2386868A3 (en) * | 2010-05-12 | 2013-02-13 | Gigle Networks Limited | Voltage measurement |
CN102981036A (en) * | 2012-12-18 | 2013-03-20 | 深圳市晶福源电子技术有限公司 | Testing method of multi-output power equipment |
US8493056B2 (en) | 2010-05-12 | 2013-07-23 | Broadcom Corporation | AC voltage measurement circuit |
EP2993480A1 (en) * | 2014-09-04 | 2016-03-09 | 3M Innovative Properties Company | Voltage sensor |
US10649009B2 (en) | 2018-03-27 | 2020-05-12 | G & W Electric Company | Ungrounded control of low energy analog (LEA) voltage measurements |
WO2022212992A1 (en) * | 2021-03-31 | 2022-10-06 | Microchip Technology Incorporated | Measuring voltage level of a voltage node utilizing a measurement integrated circuit |
US11906552B1 (en) * | 2022-09-30 | 2024-02-20 | Digital Grid Res. Inst, China Southern Power Grid | Voltage measuring method, computer device and storage medium |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016150872A1 (en) * | 2015-03-20 | 2016-09-29 | Abb Technology Ag | High-voltage measuring unit with self-correction |
CN105116211B (en) * | 2015-08-27 | 2018-03-16 | 珠海许继电气有限公司 | A kind of floating type phase voltage measurement apparatus |
EP3462182A1 (en) * | 2017-09-28 | 2019-04-03 | Siemens Aktiengesellschaft | Passive component for detecting electrical overstress in electrical rotating machines |
CN111751605B (en) * | 2019-03-29 | 2024-01-16 | 全球能源互联网研究院有限公司 | High-potential voltage measuring device and method |
Citations (3)
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US3460032A (en) * | 1967-07-18 | 1969-08-05 | Mallory & Co Inc P R | Capacitor testing apparatus including timer means for controlling the discharge time through different resistances |
US3870927A (en) * | 1971-06-08 | 1975-03-11 | English Electric Co Ltd | Capacitor voltage transformer system |
DE10346356A1 (en) * | 2003-09-26 | 2005-05-12 | Siemens Ag | Method and device for voltage measurement |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN1019332B (en) * | 1989-07-22 | 1992-12-02 | 云南省电力工业局试验研究所 | On-line overvoltage monitor for electric power system |
CN1159586C (en) * | 2002-02-05 | 2004-07-28 | 周友东 | Voltage sensor |
-
2006
- 2006-10-30 CN CN2006800562587A patent/CN101535818B/en not_active Expired - Fee Related
- 2006-10-30 WO PCT/DE2006/001922 patent/WO2008052495A1/en active Application Filing
- 2006-10-30 DE DE112006004041T patent/DE112006004041A5/en not_active Withdrawn
-
2009
- 2009-12-03 HK HK09111351.1A patent/HK1131441A1/en not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US3460032A (en) * | 1967-07-18 | 1969-08-05 | Mallory & Co Inc P R | Capacitor testing apparatus including timer means for controlling the discharge time through different resistances |
US3870927A (en) * | 1971-06-08 | 1975-03-11 | English Electric Co Ltd | Capacitor voltage transformer system |
DE10346356A1 (en) * | 2003-09-26 | 2005-05-12 | Siemens Ag | Method and device for voltage measurement |
Non-Patent Citations (1)
Title |
---|
GHASSEMI F; GALE P F; CLEGG B; CUMMING T; COUTTS C: "Method to measure CVT transfer function", IEEE TRANSACTIONS ON POWER DELIVERY, vol. 17, no. 4, 4 October 2002 (2002-10-04), USA, pages 915 - 920, XP002444530 * |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010009235A1 (en) * | 2010-02-25 | 2011-08-25 | Feng, Yongxin, 89079 | Device for measuring interference voltages of high frequencies and low amplitudes in power electronic components of electrical systems, has measurement circuit whose transfer function is determined using parameter estimating algorithm |
EP2386868A3 (en) * | 2010-05-12 | 2013-02-13 | Gigle Networks Limited | Voltage measurement |
US8493056B2 (en) | 2010-05-12 | 2013-07-23 | Broadcom Corporation | AC voltage measurement circuit |
WO2012069307A1 (en) * | 2010-11-24 | 2012-05-31 | Siemens Aktiengesellschaft | Measurement and/or voltage conversion device |
CN102981036A (en) * | 2012-12-18 | 2013-03-20 | 深圳市晶福源电子技术有限公司 | Testing method of multi-output power equipment |
EP2993480A1 (en) * | 2014-09-04 | 2016-03-09 | 3M Innovative Properties Company | Voltage sensor |
WO2016036589A1 (en) * | 2014-09-04 | 2016-03-10 | 3M Innovative Properties Company | Voltage sensor |
US10649009B2 (en) | 2018-03-27 | 2020-05-12 | G & W Electric Company | Ungrounded control of low energy analog (LEA) voltage measurements |
US10948521B2 (en) | 2018-03-27 | 2021-03-16 | G & W Electric Company | Ungrounded control of low energy analog (LEA) voltage measurements |
WO2022212992A1 (en) * | 2021-03-31 | 2022-10-06 | Microchip Technology Incorporated | Measuring voltage level of a voltage node utilizing a measurement integrated circuit |
US11906552B1 (en) * | 2022-09-30 | 2024-02-20 | Digital Grid Res. Inst, China Southern Power Grid | Voltage measuring method, computer device and storage medium |
Also Published As
Publication number | Publication date |
---|---|
CN101535818A (en) | 2009-09-16 |
HK1131441A1 (en) | 2010-01-22 |
CN101535818B (en) | 2012-04-18 |
DE112006004041A5 (en) | 2009-07-02 |
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