CN115219975B - Device and method for measuring and correcting harmonic error of capacitor voltage transformer - Google Patents
Device and method for measuring and correcting harmonic error of capacitor voltage transformer Download PDFInfo
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Abstract
The invention provides a device and a method for measuring and correcting harmonic errors of a capacitor voltage transformer, wherein a first current transformer and a second current transformer are used for measuring capacitance current of a primary side of the capacitor voltage transformer to the ground, the capacitance current under each harmonic frequency is decomposed from the capacitance current, capacitance reactance under the subharmonic frequency is combined to obtain each subharmonic voltage, voltage of a secondary side of the capacitor voltage transformer is measured and uploaded to a monitoring platform, the amplitude-frequency response curve of a frequency characteristic database is read by the monitoring platform, so that the deviation of the measured voltage and the real harmonic voltage is calculated, a harmonic voltage correction coefficient is obtained, a field measurement result is corrected by using the coefficient to obtain the real harmonic voltage, and the harmonic voltages obtained by two modes are summed by a comprehensive processing module to obtain a final harmonic voltage value, so that the existing capacitor voltage transformer is simply modified to be used for measuring the harmonic voltage data.
Description
Technical Field
The invention relates to the technical field of harmonic voltage measurement, in particular to a device and a method for measuring and correcting harmonic errors of a capacitor voltage transformer.
Background
A Capacitor Voltage Transformer (CVT) is a main voltage measuring device in a power grid with a voltage class of more than 110kV, but due to the measurement principle, because a capacitance inductance device exists inside the CVT, an unavoidable stray capacitance effect will cause that a secondary side harmonic voltage is difficult to reflect a true value of a high-voltage side harmonic voltage according to a rated transformation ratio in an actual detection process, that is, a measurement result has a certain error when measuring the content of each harmonic voltage of a power system, so that the CVT is definitely specified in the national standard and cannot be used for measuring the harmonic voltage, and in view of the increasing of various nonlinear loads of the power system, the requirement for measuring the harmonic voltage by using the CVT is more and more urgent.
The disclosure No. CN109239638A provides a harmonic error measurement and correction device for a capacitive voltage transformer, which is connected in parallel with a test capacitive voltage transformer through a capacitive voltage divider, and the output value of the capacitive voltage divider is used as a reference value of the secondary side output of the capacitive voltage transformer, and the output value of the capacitive voltage divider is compared with the output value of the test capacitive voltage transformer, so as to obtain the actual transmission coefficient of the capacitive voltage transformer at a certain harmonic frequency, and it cannot be ensured that the capacitive voltage divider can measure the working conditions of the capacitive voltage transformer at various harmonic frequencies.
Disclosure of Invention
The invention aims to provide a device and a method for measuring and correcting harmonic errors of a capacitor voltage transformer, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a capacitive voltage transformer harmonic error measurement correction apparatus, comprising:
the first current transformer is connected in series with a circuit between a primary winding and a grounding end of an intermediate transformer in the capacitor voltage transformer and is used for measuring grounding capacitance current of the primary winding of the intermediate transformer;
the second current transformer is connected in series with a circuit between an intermediate capacitor and a grounding end in the capacitor voltage transformer and is used for measuring grounding capacitance current of the intermediate capacitor;
the voltage transformer is electrically connected with the secondary side of the capacitor voltage transformer and is used for carrying out voltage conversion to reduce the voltage of the secondary side of the capacitor voltage transformer without distortion;
the signal conditioning module is electrically connected with the first current transformer and the second current transformer and is used for converting the capacitance current collected by the first current transformer and the second current transformer into a voltage signal suitable for A/D analog-to-digital conversion so as to facilitate analog-to-digital conversion;
the A/D conversion module is electrically connected with the voltage transformer and the signal conditioning module and is used for converting the secondary side voltage and the capacitance current analog signals into corresponding digital signals;
the current processing module is electrically connected with the A/D conversion module and used for decomposing capacitance current under each harmonic frequency according to the digital signals of the two capacitance currents to ground and calculating each subharmonic voltage by combining the capacitive reactance of the high-voltage capacitor and the medium-voltage capacitor;
the voltage processing module is electrically connected with the A/D conversion module and used for calculating secondary voltage data of the capacitor voltage transformer according to the data of the capacitor voltage transformer;
the network communication module is electrically connected with the voltage processing module and the comprehensive processing module and is used for sending the secondary voltage data calculated by the voltage processing module to the monitoring platform and the comprehensive processing module and sending the data sent by the monitoring platform to the comprehensive processing module;
the monitoring platform is in communication connection with the network communication module and is used for calling frequency characteristic curve data of the corresponding capacitor voltage transformer according to the secondary voltage data calculated by the voltage processing module, correcting a harmonic wave measurement result according to the characteristic curve and sending the corrected harmonic wave voltage data to the network communication module;
the frequency characteristic database is electrically connected with the monitoring platform and is used for storing frequency characteristic curve data of various capacitor voltage transformers;
the comprehensive processing module is electrically connected with the current processing module and is used for processing the harmonic voltage data calculated by the current processing module and the harmonic voltage data corrected by the monitoring platform and calculating the average value of the harmonic voltage;
and the field communication module is electrically connected with the comprehensive processing module and used for constructing a field communication network and transmitting the average value of the harmonic voltage calculated by the comprehensive processing module to field equipment.
Preferably, the first current transformer and the second current transformer are respectively and electrically connected with the two signal conditioning modules which are isolated from each other.
Preferably, the voltage transformer and the three A/D conversion modules electrically connected with the two signal conditioning modules are isolated from each other.
Preferably, a grounding end of a primary winding of the intermediate transformer inside the capacitor voltage transformer and a grounding end of the intermediate capacitor inside the capacitor voltage transformer are isolated from each other.
Preferably, the first current transformer and the second current transformer are two current transformers with different measurement errors.
The invention also provides a method for measuring and correcting harmonic errors of the capacitor voltage transformer, wherein the method is suitable for the correcting device and comprises the following specific steps:
s1, a first current transformer measures harmonic current I of grounding capacitance under corresponding angular frequency of a primary winding of an intermediate transformer 1 (ω)；
S2, the second current transformer measures the harmonic current I of the grounding capacitance of the internal intermediate capacitor of the capacitor voltage transformer under the corresponding angular frequency 2 (ω)；
S3, the signal conditioning module is used for harmonic current I 1 (omega) and harmonic currents I 2 (omega) converting the current into a corresponding voltage signal suitable for the measuring range of the A/D conversion module;
s4, the voltage transformer collects the secondary side voltage U (omega) of the capacitor voltage transformer under the corresponding angular frequency and reduces the voltage to a voltage signal suitable for the measuring range of the A/D conversion module;
s5, the A/D conversion module converts the harmonic current I 1 (ω)、I 2 (omega) and secondary side voltage U (omega) are converted into digital quantities and respectively sent to a current processing module and a voltage processing module;
s6, the current processing module processes the harmonic current I 1 (ω)、I 2 (omega) calculating harmonic voltage U 1 (ω), harmonic voltage U 1 The formula for (ω) is:
in the formula, C 1 、C 2 The high-voltage capacitance value and the medium-voltage capacitance value of the capacitor voltage transformer are respectively, and the harmonic voltage U is processed by the current processing module 1 (omega) the data are sent to a comprehensive processing module;
s7, the voltage processing module sends the secondary side voltage U (omega) to a monitoring platform and a comprehensive processing module through a network communication module, the monitoring platform matches frequency characteristic curve data of various manufacturers in a frequency characteristic database according to the data of the secondary side voltage U (omega), and corresponding harmonic voltage U is calculated according to the frequency characteristic curve data 2 (ω)；
S8, the monitoring platform transmits the harmonic voltage U to the monitoring platform through a network communication module 2 (omega) to a comprehensive processing module, which processes the harmonic voltage U according to 1 (omega) and U 2 (omega) calculating harmonic voltage U P The value, the calculation formula is:
and the harmonic voltage U is converted into P The value is sent to the field device via the field communication module.
Compared with the prior art, the invention has the beneficial effects that:
the invention measures the capacitance voltage transformer primary side earth capacitance current through the first current transformer and the second current transformer, decomposes the capacitance current under each harmonic frequency from the capacitance current, combines the capacitance reactance under the subharmonic frequency to obtain each subharmonic voltage, measures the secondary side voltage through the voltage transformer and uploads the secondary side voltage to the monitoring platform, the monitoring platform reads the amplitude-frequency response curve of the frequency characteristic database, thereby calculating the deviation of the measured voltage and the real harmonic voltage, obtaining the harmonic voltage correction coefficient, correcting the field measurement result by using the coefficient to obtain the real harmonic voltage, and obtaining the final harmonic voltage value after the harmonic voltages obtained by the two modes are summed through the comprehensive processing module.
Drawings
FIG. 1 is a schematic diagram of the overall system of the present invention.
In the figure: the device comprises a first current transformer 1, a second current transformer 2, a voltage transformer 3, a signal conditioning module 4, an A/D conversion module 5, a current processing module 6, a voltage processing module 7, a network communication module 8, a monitoring platform 9, a frequency characteristic database 10, a comprehensive processing module 11, a field communication module 12 and a capacitor voltage transformer 13.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example (b):
referring to fig. 1, the present invention provides a technical solution:
the utility model provides a correcting unit is measured to capacitive voltage transformer harmonic error, includes first current transformer 1, second current transformer 2, voltage transformer 3, signal conditioning module 4, AD conversion module 5, current processing module 6, voltage processing module 7, network communication module 8, monitoring platform 9, frequency characteristics database 10, comprehensive processing module 11 and field communication module 12, wherein:
the first current transformer 1 is connected in series to a circuit between a primary winding and a grounding terminal of an intermediate transformer inside a capacitor voltage transformer 13 and is used for measuring a grounding capacitance current of the primary winding of the intermediate transformer, the second current transformer 2 is connected in series to a circuit between the intermediate capacitor inside the capacitor voltage transformer 13 and the grounding terminal and is used for measuring a grounding capacitance current of the intermediate capacitor, the first current transformer 1 and the second current transformer 2 are two current transformers with different measurement errors, the harmonic voltage measurement error is increased along with the increase of the measurement error of the current transformers, when the measurement errors of the 2 current transformers are different, the influence on the harmonic measurement error is small, the measurement error is reduced, the current transformers with different measurement errors are adopted, so that the measurement accuracy is effectively improved, the grounding terminal of the primary winding of the intermediate transformer inside the capacitor voltage transformer 13 and the grounding terminal of the intermediate capacitor inside the capacitor voltage transformer 13 are mutually isolated, namely the two grounding terminals are different, the first current transformer 1 and the second current transformer 2 mainly collect a grounding capacitance current transformer 13 grounding capacitance current, and the primary side of the capacitor voltage transformer 1 and the second current transformer 2 select an opening type CT 97L as a primary side CT 1.
The secondary side electric connection of voltage transformer 3 and capacitive voltage transformer 13 for carry out the voltage conversion and carry out undistorted reduction with capacitive voltage transformer 13 secondary side voltage, because capacitive voltage transformer 13's secondary side phase voltage is generally about 100V, consequently need adopt voltage transformer 3 to reduce secondary side voltage once more, voltage transformer 3 adopts JLPT02 type voltage transformer.
The signal conditioning module 4 is electrically connected with the first current transformer 1 and the second current transformer 2 and used for converting capacitance current collected by the first current transformer 1 and the second current transformer 2 into voltage signals suitable for A/D (analog to digital) analog-to-digital conversion, analog-to-digital conversion is convenient to carry out, the first current transformer 1 and the second current transformer 2 are respectively electrically connected with the two signal conditioning modules 4 which are isolated from each other and are mutually independent and not interfered with each other when signal conditioning is carried out, the signal conditioning module 4 adopts an operational amplifier circuit based on OP07CDR chip design to form and follow input current signals, and two paths of signals are converted into voltage signals through a designed following circuit, so that analog-to-digital conversion is convenient to carry out.
The A/D conversion module 5 is electrically connected with the voltage transformer 3 and the signal conditioning module 4 and used for converting secondary side voltage and capacitance current analog signals into corresponding digital signals, the three A/D conversion modules 5 electrically connected with the voltage transformer 3 and the two signal conditioning modules 4 are mutually isolated and mutually independent and do not interfere with each other when analog-to-digital conversion is carried out, and the A/D conversion module 5 is formed based on an A/D conversion chip AD 7606.
The current processing module 6 is electrically connected with the a/D conversion module 5, and is configured to decompose capacitance current at each harmonic frequency according to two digital signals of capacitance current to ground, and calculate each subharmonic voltage by combining capacitance reactance of a high-voltage capacitor and a medium-voltage capacitor, the voltage processing module 7 is electrically connected with the a/D conversion module 5, and is configured to calculate secondary voltage data of the capacitance voltage transformer 13 according to data of the capacitance voltage transformer 13, the current processing module 6 and the voltage processing module 7 both adopt an STM32F429 series chip core processor and a controller, the current processing module 6 mainly decomposes capacitance current at each harmonic frequency according to capacitance current to ground, and then combines capacitance reactance at the subharmonic frequency to obtain each subharmonic voltage, and a calculation formula is:
in the formula, C 1 、C 2 Respectively, the high-voltage capacitance value and the medium-voltage capacitance value, I, of the capacitor voltage transformer 13 1 (ω) harmonic currents of the ground capacitance of the primary winding of the intermediate transformer at the corresponding angular frequency, I, measured by the first current transformer 1 2 (ω) is a second electronThe current transformer 2 measures the harmonic current of the grounding capacitance of the internal intermediate capacitor of the capacitor voltage transformer 13 under the corresponding angular frequency, and the current processing module 6 processes the harmonic current and then converts the harmonic voltage U into the harmonic voltage U 1 The (ω) data is sent to the integrated processing module 11.
Voltage processing module 7 is used for handling secondary side voltage, reachs data such as frequency amplitude of voltage, then sends monitoring platform 9, network communication module 8 and voltage processing module 7, comprehensive processing module 11 electric connection for secondary voltage data with voltage processing module 7 calculation send monitoring platform 9 and comprehensive processing module 11, and with data transmission to comprehensive processing module 11 that monitoring platform 9 sent, network communication module 8 constitutes based on MODEM F2X03, has the function of wireless transmission data, is used for as voltage processing module 7, comprehensive processing module 11, monitoring platform 9 and site communication module 12 between signal transmission's bridge.
The monitoring platform 9 is in communication connection with the network communication module 8, and is configured to call frequency characteristic curve data of the corresponding capacitive voltage transformer 13 according to the secondary voltage data calculated by the voltage processing module 7, correct a harmonic measurement result according to a characteristic curve, and send the corrected harmonic voltage data to the network communication module 8, the monitoring platform 9 is a PC computer, the frequency characteristic database 10 is electrically connected with the monitoring platform 9 and is configured to store frequency characteristic curve data of various capacitive voltage transformers 13, the frequency characteristic database 10 is a device such as a storage hard disk, frequency characteristic curve data of various capacitive voltage transformers 13 are stored in the frequency characteristic database 10, the monitoring platform 9 matches frequency characteristic curve data of various manufacturers in the frequency characteristic database 10 according to data of a secondary side voltage U (ω) after receiving the secondary side voltage data of the capacitive voltage transformers 13, and calculates corresponding harmonic voltage U (ω) according to the frequency characteristic curve data 2 (ω)。
The comprehensive processing module 11 is electrically connected to the current processing module 6, and is configured to process each harmonic voltage data calculated by the current processing module 6 and the harmonic voltage data corrected by the monitoring platform 9, and calculate an average value of the harmonic voltagesThe integrated processing module 11 is formed based on STM32F407 core processor chip, and the integrated processing module 11 is based on harmonic voltage U 1 (omega) and U 2 (omega) calculating harmonic voltage U P The value, the calculation formula is:
the comprehensive processing module 11 converts the harmonic voltage U P The value is sent to the field device through the field communication module 12, the field communication module 12 is electrically connected with the comprehensive processing module 11 and used for constructing a field communication network and transmitting the average value of the harmonic voltage calculated by the comprehensive processing module 11 to the field device, the field communication module 12 is formed based on a chip DP83848 of the Ethernet technology and can construct an Ethernet local area network, so that the harmonic voltage U is transmitted to the field device P And sending to the device in the field.
The invention also provides a method for measuring and correcting harmonic errors of the capacitor voltage transformer, wherein the method is suitable for the correcting device and comprises the following specific steps:
s1, a first current transformer 1 measures harmonic current I of grounding capacitance under corresponding angular frequency of a primary winding of an intermediate transformer 1 (ω)；
S2, the second current transformer 2 measures the harmonic current I of the grounding capacitance of the intermediate capacitance in the capacitor voltage transformer 13 under the corresponding angular frequency 2 (ω)；
S3, the signal conditioning module 4 pairs of harmonic currents I 1 (omega) and harmonic currents I 2 (omega) converting the current into a corresponding voltage signal suitable for the measuring range of the A/D conversion module 5;
s4, the voltage transformer 3 collects the secondary side voltage U (omega) of the capacitor voltage transformer 13 under the corresponding angular frequency and reduces the voltage to a voltage signal suitable for the measuring range of the A/D conversion module 5;
s5, the A/D conversion module 5 converts the harmonic current I 1 (ω)、I 2 (omega) and the secondary side voltage U (omega) are converted into digital quantities and respectively sent to the current processing module 6 and the voltage processing module 7;
s6, the current processing module 6 processes the harmonic current I 1 (ω)、I 2 (omega) calculating harmonic voltage U 1 (omega), harmonic voltage U 1 The formula for (ω) is:
in the formula, C 1 、C 2 The high-voltage capacitance value and the medium-voltage capacitance value of the capacitance voltage transformer 13 are respectively, and the harmonic voltage U is processed by the current processing module 6 1 (omega) the data are sent to the comprehensive processing module 11;
s7, the voltage processing module 7 sends the secondary side voltage U (omega) to a monitoring platform 9 and a comprehensive processing module 11 through a network communication module 8, the monitoring platform 9 matches frequency characteristic curve data of various manufacturers in a frequency characteristic database 10 according to the data of the secondary side voltage U (omega), and corresponding harmonic voltage U is calculated according to the frequency characteristic curve data 2 (ω)；
S8, the monitoring platform 9 enables the harmonic voltage U to be transmitted through the network communication module 8 2 (omega) to the integrated processing module 11, said integrated processing module 11 depending on the harmonic voltage U 1 (omega) and U 2 (omega) calculating harmonic voltage U P The value, the calculation formula is:
and will harmonic voltage U P The value is sent to the field device via the field communication module 12.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a capacitive voltage transformer harmonic error measures correcting unit which characterized in that includes:
the first current transformer (1), the said first current transformer (1) connects in series on the circuit between primary winding and ground terminal of the intermediate transformer in the capacitive voltage transformer (13), is used for measuring the grounded capacitance current of the primary winding of the intermediate transformer;
the second current transformer (2), the said second current transformer (2) connects in series on the circuit between earthing end and the middle capacitance in the voltage transformer of the capacitor (13), the earthing capacitance current used for measuring the middle capacitance;
the voltage transformer (3), the voltage transformer (3) and the secondary side of the capacitor voltage transformer (13) are electrically connected, and the voltage transformer is used for carrying out voltage conversion to reduce the voltage of the secondary side of the capacitor voltage transformer (13) without distortion;
the signal conditioning module (4) is electrically connected with the first current transformer (1) and the second current transformer (2) and is used for converting capacitance currents collected by the first current transformer (1) and the second current transformer (2) into voltage signals suitable for A/D analog-to-digital conversion, so that analog-to-digital conversion is facilitated;
the A/D conversion module (5), the A/D conversion module (5) is electrically connected with the voltage transformer (3) and the signal conditioning module (4) and is used for converting secondary side voltage and capacitance current analog signals into corresponding digital signals;
the current processing module (6), the said current processing module (6) and A/D conversion module (5) electric connection, is used for decomposing the electric capacity current under each harmonic frequency according to the digital signal of two electric capacity currents to ground, and combine the capacitive reactance of the high-voltage capacitor and medium-voltage capacitor, calculate each subharmonic voltage;
the voltage processing module (7), the voltage processing module (7) is electrically connected with the A/D conversion module (5), and is used for calculating secondary voltage data of the capacitor voltage transformer (13) according to the data of the capacitor voltage transformer (13);
the network communication module (8) is electrically connected with the voltage processing module (7) and the comprehensive processing module (11) and is used for sending the secondary voltage data calculated by the voltage processing module (7) to the monitoring platform (9) and the comprehensive processing module (11) and sending the data sent by the monitoring platform (9) to the comprehensive processing module (11);
the monitoring platform (9) is in communication connection with the network communication module (8) and is used for calling frequency characteristic curve data of the corresponding capacitor voltage transformer (13) according to the secondary voltage data calculated by the voltage processing module (7), correcting a harmonic measurement result according to the characteristic curve and sending the corrected harmonic voltage data to the network communication module (8);
the frequency characteristic database (10) is electrically connected with the monitoring platform (9) and is used for storing frequency characteristic curve data of various capacitor voltage transformers (13);
the comprehensive processing module (11) is electrically connected with the current processing module (6) and is used for processing the harmonic voltage data calculated by the current processing module (6) and the harmonic voltage data corrected by the monitoring platform (9) and calculating the average value of the harmonic voltage;
the field communication module (12), the field communication module (12) and the comprehensive processing module (11) are electrically connected, and are used for constructing a field communication network and transmitting the average value of the harmonic voltage calculated by the comprehensive processing module (11) to field equipment.
2. The harmonic error measurement correction device of a capacitor voltage transformer according to claim 1, characterized in that: the first current transformer (1) and the second current transformer (2) are respectively and electrically connected with the two signal conditioning modules (4) which are isolated from each other.
3. The harmonic error measurement correction device of a capacitor voltage transformer according to claim 2, characterized in that: the voltage transformer (3) and the three A/D conversion modules (5) electrically connected with the two signal conditioning modules (4) are mutually isolated.
4. The harmonic error measurement correction device of a capacitor voltage transformer according to claim 1, characterized in that: and the grounding end of the primary winding of the intermediate transformer in the capacitor voltage transformer (13) is isolated from the grounding end of the intermediate capacitor in the capacitor voltage transformer (13).
5. The harmonic error measurement correction device of the capacitor voltage transformer according to claim 1, characterized in that: the first current transformer (1) and the second current transformer (2) are two current transformers with different measurement errors.
6. A method for measuring and correcting harmonic errors of a capacitor voltage transformer is characterized by comprising the following steps: the method is suitable for the correction device of any one of claims 1 to 5, and comprises the following specific steps:
s1, a first current transformer (1) measures harmonic current I of grounding capacitance under corresponding angular frequency of a primary winding of an intermediate transformer 1 (ω)；
S2, the second current transformer (2) measures the harmonic current I of the grounding capacitance of the internal middle capacitance of the capacitor voltage transformer (13) under the corresponding angular frequency 2 (ω)；
S3, the signal conditioning module (4) is used for adjusting the harmonic current I 1 (omega) and harmonic currents I 2 (omega) converting the current into a corresponding voltage signal suitable for the measuring range of the A/D conversion module (5);
s4, collecting a secondary side voltage U (omega) of the capacitor voltage transformer (13) under the corresponding angular frequency by the voltage transformer (3), and reducing the voltage to a voltage signal suitable for the measuring range of the A/D conversion module (5);
s5, the A/D conversion module (5) converts the harmonic current I 1 (ω)、I 2 (omega) and the secondary side voltage U (omega) are converted into digital quantities and respectively sent to the current processing module (6) and the voltage processing module (7);
s6, the current processing module (6) processes the harmonic current I 1 (ω)、I 2 (omega) calculating harmonic voltage U 1 (ω), harmonic voltage U 1 The formula for (ω) is:
in the formula, C 1 、C 2 Respectively a high-voltage capacitance value and a medium-voltage capacitance value of a capacitance voltage transformer (13), and a harmonic voltage U is processed by a current processing module (6) 1 (omega) the data are sent to an integrated processing module (11);
s7, the voltage processing module (7) sends the secondary side voltage U (omega) to a monitoring platform (9) and a comprehensive processing module (11) through a network communication module (8), the monitoring platform (9) matches frequency characteristic curve data of each manufacturer in a frequency characteristic database (10) according to the data of the secondary side voltage U (omega), and corresponding harmonic voltage U is calculated according to the frequency characteristic curve data 2 (ω)；
S8, the monitoring platform (9) enables the harmonic voltage U to be transmitted through the network communication module (8) 2 (ω) to a comprehensive processing module (11), said comprehensive processing module (11) depending on the harmonic voltage U 1 (omega) and U 2 (omega) calculating harmonic voltage U P The value, the calculation formula is:
and will harmonic voltage U P The value is sent to the field device via the field communication module (12).
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Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10246740A (en) * | 1997-03-04 | 1998-09-14 | Shikoku Electric Power Co Inc | Method and device for measuring harmonic by capacitor type potential transformer |
| GB0010720D0 (en) * | 2000-05-03 | 2000-06-28 | Ghassemi Foroozan | Power quality sensors for conventional capacitor coupled voltage transformers |
| CN103364604B (en) * | 2013-07-30 | 2016-06-29 | 武汉大学 | Capacitance type potential transformer and measuring method suitable in high-voltage harmonic measurement |
| CN203350323U (en) * | 2013-07-30 | 2013-12-18 | 武汉大学 | Capacitance-type voltage transformer applicable to high-voltage harmonic measurement |
| CN103675445B (en) * | 2013-12-17 | 2017-01-25 | 国家电网公司 | Method for high-voltage harmonic measurement through capacitive voltage mutual inductor |
| CN203606409U (en) * | 2013-12-17 | 2014-05-21 | 国家电网公司 | Capacitor voltage transformer |
| CN106771645B (en) * | 2016-12-12 | 2019-06-25 | 国网四川省电力公司电力科学研究院 | Capacitance type potential transformer dielectric loss and capacitance on-line monitoring method and monitoring system |
| CN108037475B (en) * | 2017-11-15 | 2022-04-29 | 全球能源互联网研究院有限公司 | Harmonic transfer characteristic test system for capacitor voltage transformer |
| CN109085526B (en) * | 2018-07-20 | 2021-05-11 | 国网江苏省电力有限公司常州供电分公司 | Harmonic measurement method, device and system based on capacitive voltage transformer |
| CN109239638A (en) * | 2018-08-17 | 2019-01-18 | 国网江苏省电力有限公司盐城供电分公司 | Capacitance type potential transformer harmonic error measures correcting device |
| CN109557494A (en) * | 2018-12-11 | 2019-04-02 | 国网江苏省电力有限公司常州供电分公司 | A kind of harmonic measuring device and system based on capacitance type potential transformer |
| CN110221237A (en) * | 2019-06-27 | 2019-09-10 | 广东工业大学 | A kind of capacitance type potential transformer harmonic voltage measurement method and apparatus |
| CN110927650A (en) * | 2019-12-03 | 2020-03-27 | 国网江苏省电力有限公司常州供电分公司 | Harmonic voltage measuring device and method for capacitor voltage transformer |
| CN111564844A (en) * | 2020-03-27 | 2020-08-21 | 国网福建省电力有限公司龙岩供电公司 | CVT secondary side harmonic monitoring abnormal data correction method |
| CN111812573B (en) * | 2020-06-09 | 2022-11-01 | 国网山东省电力公司电力科学研究院 | Method and system for analyzing harmonic test error characteristics of extra-high voltage CVT |
| EP4012734A1 (en) * | 2020-12-11 | 2022-06-15 | Siemens Energy Global GmbH & Co. KG | Eliminating phase error in capacitive voltage transformer |
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2022
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