CN110456123B - Broadband transient voltage division measuring device and method - Google Patents
Broadband transient voltage division measuring device and method Download PDFInfo
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- CN110456123B CN110456123B CN201910717695.8A CN201910717695A CN110456123B CN 110456123 B CN110456123 B CN 110456123B CN 201910717695 A CN201910717695 A CN 201910717695A CN 110456123 B CN110456123 B CN 110456123B
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- 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
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a broadband transient voltage partial pressure measuring device and a broadband transient voltage partial pressure measuring method, wherein the device comprises a high-voltage arm unit, a low-voltage arm unit and a high-voltage arm unit, wherein the high-voltage arm unit is used for dividing the high voltage of a measured line to obtain a divided low voltage and sending the divided low voltage to the low-voltage arm unit; a low-voltage arm unit for sending the divided low voltage to the broadband transient measurement unit; the broadband transient state measuring unit is used for measuring the divided voltage low voltage sent by the low-voltage arm unit and determining the high voltage of the measured line according to the divided voltage low voltage and a divided voltage ratio; the device adopts a low-inductance ceramic capacitor and a non-inductance resistor to carry out multistage series connection, and can be directly hung on a transmission line to measure the high voltage of a measured circuit in real time; the device can measure the amplitude of voltage, has high frequency band and is little influenced by the external environment; the real waveform of the overvoltage can be determined, and the method has important significance for safe and stable operation of the power transmission line.
Description
Technical Field
The invention relates to the field of power systems, in particular to a broadband transient voltage division measuring device and method.
Background
In an electric power system, overvoltage is formed by lightning invasion or isolation disconnecting switch operation of a power transmission line and a transformer substation, the overvoltage can endanger operation equipment of the power transmission line and the transformer substation, and accurate measurement of the overvoltage of the power transmission line and the transformer substation has important significance on economic design and safe and stable operation of the power transmission line. However, since the amplitude of the overvoltage is high, the frequency band is wide, and the overvoltage occurs under unpredictable conditions, it is difficult to measure the overvoltage of the power transmission line in real time. In the past, the overvoltage of a power transmission line and a transformer substation is researched and analyzed in a multi-mode based on simulation calculation, but various complex influence factors under the real condition are difficult to be fully considered in the simulation calculation process, the simulation result is different from the actual operation condition, the waveform parameters of the simulation calculation can only be used as reference, a certain difference exists between the waveform parameters and the real waveform, and when the simulation calculation modeling is different, the calculated overvoltage waveform is very different, so that the calculation accuracy is difficult to evaluate.
In order to accurately measure the overvoltage waveform of the power transmission line, the most intuitive method is to use a voltage divider to measure, and the frequency bandwidth of the voltage divider used for measurement is required to be as follows: the overvoltage waveform from the power frequency voltage to the front edge of the fast wave head needs to be covered and measured, and the measurement amplitude is high: the overvoltage amplitude from rated power frequency operating voltage to (2-3) times rated voltage can be covered.
At present, the mode of real-time overvoltage monitoring of a transformer substation is mostly carried out by adopting an electric field sensor, the electric field sensor has the advantages of small volume and convenience in installation, but the electric field sensor is easily interfered by the surrounding environment in a complex occasion, other charged bodies or grounding bodies can also couple the electric field sensor except a power transmission line so as to form coupling voltage on the sensor, and the calibration of the voltage coefficient of the electric field sensor is difficult.
Disclosure of Invention
In order to solve the problems that the prior art in the background art can not be directly hung on a power transmission line to measure the high voltage of a measured circuit in real time, is greatly influenced by the external environment and is difficult to determine the true waveform of the overvoltage, the invention provides a broadband transient voltage division measuring device, which comprises:
one end of the high-voltage arm unit is connected with a high-voltage line of a tested line, and the other end of the high-voltage arm unit is connected with the low-voltage arm unit; the high-voltage arm unit is used for dividing the high voltage of the tested line to obtain a divided low voltage and sending the divided low voltage to the low-voltage arm unit;
one end of the low-voltage arm unit is respectively connected with the high-voltage arm unit and the broadband transient measuring unit, and the other end of the low-voltage arm unit is connected with a grounding end; the low-voltage arm unit is used for sending the divided low voltage to the broadband transient measurement unit;
the broadband transient state measuring unit is connected with the low-voltage arm unit at one end; the broadband transient state measuring unit is used for measuring the divided voltage low voltage sent by the low-voltage arm unit and determining the high voltage amplitude and the waveform of the measured line according to the divided voltage low voltage and the divided voltage ratio.
Further, the device comprises M groups of high-voltage arm units; and M is a positive integer.
Further, the high-voltage arm unit comprises N groups of high-voltage resistance-capacitance modules connected in series; and N is a positive integer.
Further, the low-voltage arm unit comprises a PCB circuit model.
Further, the low-voltage arm unit comprises Q groups of low-voltage resistance-capacitance modules connected in parallel; and Q is a positive integer.
Further, the high-voltage resistance-capacitance module and the low-voltage resistance-capacitance module comprise a low-inductance capacitor and a non-inductance resistor.
Further, the capacitance value of the low inductance capacitor in the high voltage resistance-capacitance module and the resistance value of the non-inductance resistor enable the RC time constant of the device to be smaller than P nanoseconds; and P is a positive number.
The broadband transient voltage division measurement method comprises the following steps:
determining M groups of high-voltage arm units in the broadband transient voltage partial pressure measuring device according to the voltage grade of the power transmission line to be measured; m is a positive integer;
connecting the high-voltage arm unit with the high-voltage end of the line to be measured, connecting the low-voltage arm unit and the grounding end in the broadband transient voltage partial pressure measuring device, and connecting the low-voltage arm unit and the broadband transient measuring unit;
collecting the high voltage of the power transmission line to be measured, dividing the voltage by the high-voltage arm unit and the low-voltage arm unit to obtain a divided voltage and sending the divided voltage to the broadband transient measurement unit;
and determining the high voltage amplitude and the waveform of the power transmission line to be detected according to the divided voltage low voltage and the divided voltage ratio.
Further, the high-voltage arm unit comprises N groups of high-voltage resistance-capacitance modules connected in series; and N is a positive integer.
Further, the low-voltage arm unit comprises Q groups of low-voltage resistance-capacitance modules connected in parallel; and Q is a positive integer.
The invention has the beneficial effects that: the technical scheme includes that the broadband transient voltage division measuring device comprises a high-voltage arm unit, a low-voltage arm unit and a broadband transient voltage division measuring unit, wherein the high-voltage arm unit is used for dividing high voltage of a measured line to obtain divided low voltage and sending the divided low voltage to the low-voltage arm unit; a low-voltage arm unit for sending the divided low voltage to the broadband transient measurement unit; the broadband transient state measuring unit is used for measuring the divided voltage low voltage sent by the low-voltage arm unit and determining the high voltage of the measured line according to the divided voltage low voltage and a divided voltage ratio; the device adopts a low-inductance ceramic capacitor and a non-inductance resistor to carry out multistage series connection, and can be directly hung on a transmission line to measure the high voltage of a measured circuit in real time; the amplitude of the measurable voltage is high, the frequency band is wide, and the influence of the external environment is small; the device can determine the actual waveform of the overvoltage, and has important significance on the safe and stable operation of the power transmission line.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a structural diagram of a broadband transient voltage division measuring device according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for measuring a broadband transient voltage division according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their context in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a structural diagram of a broadband transient voltage division measuring device according to an embodiment of the present invention. As shown in fig. 1, the apparatus includes:
the high-voltage arm unit 1 is characterized in that one end of the high-voltage arm unit 1 is connected with a high-voltage line of a tested line, and the other end of the high-voltage arm unit 1 is connected with the low-voltage arm unit 2; the high-voltage arm unit 1 is used for dividing the high voltage of the tested line to obtain a divided low voltage and sending the divided low voltage to the low-voltage arm unit 2;
furthermore, the number of groups of the high-voltage arm units 1 can be flexibly selected according to the voltage grade of the field test, and in the example, three groups of high-voltage arm units 1 are adopted; the power frequency withstand voltage of each group of high-voltage arm units 1 is 150kV, and the withstand impact voltage is 400 kV;
furthermore, the high-voltage arm unit 1 is designed in an air insulation mode, so that the volume is light, and the transportation and the installation during a field test are convenient; in order to ensure the installation stability of the capacitor element of the high-voltage arm unit 1, a reversed V-shaped organic glass bracket is designed for fixing the disc capacitor element of the high-voltage arm unit 1;
further, the high-voltage arm unit comprises N groups of high-voltage resistance-capacitance modules 12 connected in series; n is a positive integer; in this example, 20 sets of high voltage resistance-capacitance modules 12 connected in series are used;
further, the high-voltage rc module 12 includes a low-inductance ceramic capacitor and a non-inductance resistor; in this example, the capacitance of each capacitor in the high-voltage RC module 12 is 3000pF, and the resistance of each resistor is 14 Ω, so as to ensure that the RC time constant of the voltage divider is within 100 ns;
furthermore, a cylindrical insulating connecting block for fixing is installed between every two levels of capacitors in the high-voltage arm unit 1, resistor components of each level are annularly arranged around the cylindrical insulating block and connected in parallel, the upper end and the lower end of the non-inductive resistor are welded to the metal copper foil, and the metal copper foil welded to the two ends of the resistor and the upper capacitor and the lower capacitor are tightly connected through nuts and used for reducing stray inductance of the resistor component.
One end of the low-voltage arm unit 2 is respectively connected with the high-voltage arm unit 1 and the broadband transient measurement unit 3, and the other end of the low-voltage arm unit 2 is connected with a grounding terminal; the low-voltage arm unit 2 is used for sending the divided low voltage to the broadband transient measurement unit 3;
further, the low-voltage arm unit 2 adopts a disc type PCB circuit model;
further, the low-voltage arm unit 2 comprises Q groups of low-voltage resistance-capacitance modules 21 connected in parallel; q is a positive integer; the low-voltage RC module 21 comprises a low-inductance ceramic capacitor and a non-inductance resistor, so that stray inductance parameters of elements in the low-voltage arm unit 2 can be reduced, and the frequency response characteristic of the device is improved;
in this example, the low-voltage arm unit comprises 25 groups of low-voltage resistance-capacitance modules 21 connected in parallel;
further, in order to ensure good electromagnetic interference resistance of the low-voltage arm unit 2, the low-voltage arm unit 2 is mounted in a metal shielding box.
The broadband transient state measuring unit 3, one end of the broadband transient state measuring unit 2 is connected with the low-voltage arm unit 2; the broadband transient measurement unit 3 is configured to measure the divided voltage low voltage sent by the low-voltage arm unit 2, and determine the amplitude and waveform of the measured line high voltage according to the divided voltage low voltage and a divided voltage ratio.
Furthermore, the device is small in size, light in weight and wide in measurement frequency band, and can be applied to transformer substations of 220kV and below to realize online overvoltage monitoring of circuits and calibration of scale factors of electric field sensors.
Fig. 2 is a flowchart of a method for measuring a broadband transient voltage division according to an embodiment of the present invention. As shown in fig. 2, the method includes:
in this example, three groups of high-voltage arm units in the broadband transient voltage partial pressure measuring device are determined according to the voltage grade of the power transmission line to be measured;
in this example, the output cable of the broadband transient voltage division measuring device is connected with the broadband transient measuring software; setting the amplitude and the polarity of the voltage to be measured, the voltage division ratio of the broadband transient voltage division measuring device and the total recorded duration in measuring software;
and after switching operation is carried out in the transformer substation, an overvoltage signal is generated, the broadband transient voltage signal recorded by the broadband transient voltage division measuring device is observed and recorded, and the recorded voltage waveform is subjected to parameter analysis in measuring software.
Further, the high-voltage arm unit comprises N groups of high-voltage resistance-capacitance modules connected in series; n is a positive integer;
in this example, the high-voltage arm unit includes 20 sets of high-voltage resistance-capacitance modules connected in series.
Further, the low-voltage arm unit comprises Q groups of low-voltage resistance-capacitance modules connected in parallel; q is a positive integer;
in this example, the low-voltage arm unit comprises 25 groups of low-voltage resistance-capacitance modules connected in parallel.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the disclosure may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Reference to step numbers in this specification is only for distinguishing between steps and is not intended to limit the temporal or logical relationship between steps, which includes all possible scenarios unless the context clearly dictates otherwise.
Moreover, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the disclosure and form different embodiments. For example, any of the embodiments claimed in the claims can be used in any combination.
Various component embodiments of the disclosure may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. The present disclosure may also be embodied as devices or system programs (e.g., computer programs and computer program products) for performing some or all of the methods described herein. Such programs implementing the present disclosure may be stored on a computer-readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the disclosure, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The disclosure may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several systems, several of these systems can be embodied by one and the same item of hardware.
The foregoing is directed to embodiments of the present disclosure, and it is noted that numerous improvements, modifications, and variations may be made by those skilled in the art without departing from the spirit of the disclosure, and that such improvements, modifications, and variations are considered to be within the scope of the present disclosure.
Claims (10)
1. A broadband transient voltage division measurement device, comprising:
one end of the high-voltage arm unit is connected with a high-voltage line of a tested line, and the other end of the high-voltage arm unit is connected with the low-voltage arm unit; the high-voltage arm unit is used for dividing the high voltage of the tested line to obtain a divided low voltage and sending the divided low voltage to the low-voltage arm unit; the high-voltage arm unit comprises a high-voltage arm unit, a non-inductive resistor, a metal copper foil, a cylindrical insulating connecting block for fixing, a resistor assembly, a nut and a nut, wherein a cylindrical insulating connecting block for fixing is arranged between every two levels of capacitors in the high-voltage arm unit, resistor assemblies of each level are annularly arranged around the cylindrical insulating connecting block and connected in parallel, the upper end and the lower end of the non-inductive resistor are welded to the metal copper foil, and the metal copper foil welded to the two ends of the resistor is tightly connected with the capacitors of the upper level and the lower level through the nut;
one end of the low-voltage arm unit is respectively connected with the high-voltage arm unit and the broadband transient measuring unit, and the other end of the low-voltage arm unit is connected with a grounding end; the low-voltage arm unit is used for sending the divided low voltage to the broadband transient measurement unit; wherein the low-voltage arm unit is mounted in a metal shield case;
the broadband transient state measuring unit is connected with the low-voltage arm unit at one end; the broadband transient state measuring unit is used for measuring the divided voltage low voltage sent by the low-voltage arm unit and determining the high voltage amplitude and the waveform of the measured line according to the divided voltage low voltage and the divided voltage ratio.
2. The apparatus of claim 1, wherein the apparatus comprises M groups of high voltage arm units; and M is a positive integer.
3. The apparatus of claim 1, wherein the high voltage arm unit comprises N groups of high voltage resistor-capacitor modules connected in series; and N is a positive integer.
4. The apparatus of claim 1, wherein the low voltage arm unit comprises a PCB circuit model.
5. The apparatus of claim 3, wherein the low-voltage arm unit comprises Q sets of low-voltage RC modules connected in parallel; and Q is a positive integer.
6. The apparatus of claim 5, wherein the high-voltage RC module and the low-voltage RC module comprise low-inductance capacitance and non-inductance resistance.
7. The apparatus of claim 6, wherein a capacitance value of a low inductance capacitance in the high voltage RC module and a resistance value of the non-inductance resistance are such that an RC time constant of the apparatus is less than P nanoseconds; and P is a positive number.
8. A broadband transient voltage division measurement method is characterized by comprising the following steps:
determining M groups of high-voltage arm units in the broadband transient voltage partial pressure measuring device according to the voltage grade of the power transmission line to be measured; m is a positive integer; the high-voltage arm unit comprises a high-voltage arm unit, a non-inductive resistor, a metal copper foil, a cylindrical insulating connecting block for fixing, a resistor assembly, a nut and a nut, wherein a cylindrical insulating connecting block for fixing is arranged between every two stages of capacitors in the high-voltage arm unit, resistor assemblies of each stage are annularly arranged and connected in parallel around the cylindrical insulating connecting block, the upper end and the lower end of the non-inductive resistor are welded to the metal copper foil, and the metal copper foil welded to the two ends of the resistor is tightly connected with the capacitors of the upper stage and the lower stage through the nut;
connecting the high-voltage arm unit with the high-voltage end of the power transmission line to be tested, connecting the low-voltage arm unit and the grounding end in the broadband transient voltage partial pressure measuring device, and connecting the low-voltage arm unit and the broadband transient measuring unit; wherein the low-voltage arm unit is mounted in a metal shield case;
collecting the high voltage of the power transmission line to be measured, dividing the voltage by the high-voltage arm unit and the low-voltage arm unit to obtain a divided voltage and sending the divided voltage to the broadband transient measurement unit;
and determining the high voltage amplitude and the waveform of the power transmission line to be detected according to the divided voltage low voltage and the divided voltage ratio.
9. The method of claim 8, wherein the high voltage arm unit comprises N sets of series connected high voltage resistor-capacitor modules; and N is a positive integer.
10. The method of claim 8, wherein the low-voltage arm unit comprises Q groups of low-voltage rc modules connected in parallel; and Q is a positive integer.
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| CN111025211B (en) * | 2019-11-27 | 2022-11-18 | 中国电力科学研究院有限公司 | Magnitude tracing method and system of broadband voltage standard measuring device |
| CN111830313A (en) * | 2020-07-07 | 2020-10-27 | 国网福建省电力有限公司电力科学研究院 | Transient overvoltage broadband monitoring system for modular multilevel converter |
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| CN102737828A (en) * | 2011-04-13 | 2012-10-17 | 华东电力试验研究院有限公司 | Capacitor voltage transformer provided with transient overvoltage monitoring unit |
| CN103558435A (en) * | 2013-11-04 | 2014-02-05 | 国网上海市电力公司 | 35kV broadband electronic type voltage transformer |
| CN103592497A (en) * | 2013-11-12 | 2014-02-19 | 安徽一天电气技术有限公司 | Broadband voltage collector |
| CN106124843A (en) * | 2016-07-08 | 2016-11-16 | 国网上海市电力公司 | A kind of wide frequency band measurement system of AC network transient process |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102737828A (en) * | 2011-04-13 | 2012-10-17 | 华东电力试验研究院有限公司 | Capacitor voltage transformer provided with transient overvoltage monitoring unit |
| CN103558435A (en) * | 2013-11-04 | 2014-02-05 | 国网上海市电力公司 | 35kV broadband electronic type voltage transformer |
| CN103592497A (en) * | 2013-11-12 | 2014-02-19 | 安徽一天电气技术有限公司 | Broadband voltage collector |
| CN106124843A (en) * | 2016-07-08 | 2016-11-16 | 国网上海市电力公司 | A kind of wide frequency band measurement system of AC network transient process |
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