CN110907729A - Power equipment testing method based on active compensation mutual inductor and three-phase source - Google Patents
Power equipment testing method based on active compensation mutual inductor and three-phase source Download PDFInfo
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- CN110907729A CN110907729A CN201911206613.XA CN201911206613A CN110907729A CN 110907729 A CN110907729 A CN 110907729A CN 201911206613 A CN201911206613 A CN 201911206613A CN 110907729 A CN110907729 A CN 110907729A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention relates to a power equipment testing method based on an active compensation mutual inductor and a three-phase source, which comprises the steps of adding active compensation current mutual inductors at the output end of the three-phase source, wherein the number of the active compensation current mutual inductors is determined according to the maximum load of single-phase current of the three-phase source; and a primary side coil of the current transformer is connected in series and then connected in series with the standard meter, the wave recorder and the three-phase source, and a secondary side coil of the current transformer is connected with the equipment to be tested. According to the power equipment testing method based on the active compensation mutual inductor and the three-phase source, active compensation is performed through the current mutual inductor, the consistency of the primary side current and the secondary side current is ensured, the compensation circuit is added, loss reduction errors in current transmission are reduced, and the problem that errors exist in laboratory tests is solved.
Description
Technical Field
The invention belongs to the technical field of power equipment detection, and particularly relates to a power equipment testing method based on an active compensation mutual inductor and a three-phase source.
Background
Nowadays, a power grid approaches to development and construction of intelligent energy control of high capacity, high voltage, digital communication and power transmission and distribution, a Current Transformer (CT) is widely used in aspects of monitoring, metering, protecting and the like of primary equipment operation of a power system, requirements of development of the power grid on accuracy and reliability of secondary equipment are continuously improved, working environments of the secondary equipment are more and more rigorous, how to reduce errors of the current transformer as much as possible is one of hot spots of research in the field of power utilization. The three-phase source has complete functions, is convenient to carry, has high accuracy, and is increasingly applied to the metering industry by combining with the latest digital signal processing method.
The three-phase program control standard power source is a new generation high-precision standard power source which is composed of a DSP based on 1.2G MAC, a large-scale FPGA, a high-speed high-precision DA and a high-fidelity power amplifier. Generally, a three-phase source can only test one device to be tested simultaneously, the device to be tested is systematically detected according to a related test method, normal tests can be performed, but when the number of the devices to be tested is large, and the construction period is short, due to the fact that the cost of the three-phase source is too high, the number of laboratory equipment is limited, the laboratory equipment is not in direct proportion to the large test quantity, and the shortage of testers, the test efficiency is reduced and the investment cost of enterprises is increased due to the factors, and the development of enterprises in the field is restricted.
Disclosure of Invention
The invention aims to provide a power equipment testing method based on an active compensation mutual inductor and a three-phase source, which can be used for simultaneously measuring a plurality of loads, greatly improving the working efficiency and saving the enterprise cost
In order to achieve the purpose, the invention adopts the following technical scheme:
a power equipment testing method based on an active compensation mutual inductor and a three-phase source comprises the following steps: adding active compensation current transformers at the output end of the three-phase source, wherein the number of the active compensation current transformers is determined according to the maximum load of single-phase current of the three-phase source; a primary side coil of the current transformer is connected in series and then connected in series with a standard meter, a wave recorder and a three-phase source, and a secondary side coil of the current transformer is connected with equipment to be tested; and the turns of the primary coil and the secondary coil of the current transformer are equal.
When the plurality of current transformers are connected with the equipment to be tested, the secondary side coils of the current transformers which are not connected with the equipment to be tested need to be in short circuit.
In the above step, when detecting the device to be detected, the method further comprises a detection step, which is specifically as follows:
(1) acquiring current values of all paths output by the current transformer to obtain current output values;
(2) and comparing the difference value between each output value of the current and the output value of the three-phase source with an error threshold value, if the difference value of each path is smaller than the error threshold value, generating no alarm information, and continuing to test, otherwise, stopping the test, and reading the alarm information of the mutual inductor.
According to the technical scheme, the power equipment testing method based on the active compensation mutual inductor and the three-phase source carries out active compensation through the current mutual inductor, ensures that the primary side current and the secondary side current are consistent, adds the compensation circuit, reduces loss reduction errors in current transmission, and solves the problem of errors in laboratory tests; the active compensation current transformer is connected with a wave recorder, a standard meter and a three-phase source in series, the secondary current of the active compensation current transformer is connected with a load, and the active compensation current transformer which is not connected with the load is in short circuit, so that the problems of efficiency and accuracy in laboratory tests are solved; the invention can simultaneously measure a plurality of loads, greatly improves the efficiency and the accuracy of equipment test, and further realizes the optimal balance among parallel detection data integration processing, resource consumption and resource utilization rate.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a schematic diagram of the primary side all devices in series;
fig. 3 is a power equipment testing method based on an active compensation transformer and a three-phase source.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1 to 3, the method for testing an electrical device based on an active compensation transformer and a three-phase source of the present embodiment includes the following steps:
(1) adding current transformers at the output end of the three-phase source, wherein the number of the current transformers is determined according to the maximum load of single-phase current of the three-phase source;
calculating the maximum load R of the single-phase current of the three-phase sourceL1(ii) a Calculating the single-phase maximum load of the three-phase source under the condition that the input current is 10A;
and calculating the single-phase maximum load of the current transformer according to the number of turns of primary side and secondary side coils of the current transformer, and calculating the number of the current transformers according to the single-phase maximum load of a three-phase source.
Calculating the maximum load R of the single-phase current of the three-phase sourceL1The method comprises the following steps:
controlling the input of the primary side current of the three-phase source at 10A, adjusting the load size, and setting A, B, C three-phase output power as PA、PB、PCMaximum output power P and open-circuit voltage UnCalculating the maximum output current I of the three-phase sourcemax；
Setting: pA＝P1，PB＝P2，PC＝P3，P＝P0，Un＝U1；
If: if | P1| > | P2 |; p0 ═ P2, Imax＝P0/U1；
If: if | P1| > | P3 |; p0 ═ P3, Imax＝P0/U1；
If: if | P2| > | P3 |; p0 ═ P3, Imax＝P0/U1；
Get PA、PB、PCThe minimum value is the maximum output power of a single phase of a three-phase source, and the known open circuit voltage is UnThe maximum output current I of the three-phase source can be calculatedmax；
In an electrical power system, the load is the power and current through the equipment, and the maximum on-load is the maximum current that the equipment will experience under normal operating conditions, so RL1＝Imax(ii) a Measuring the open-circuit voltage U of the current of the three-phase source at this timemaxMaximum load R of three-phase sourceL1＝UmaxI, wherein I ═ 10A.
Three-phase source single-phase maximum load RL1And secondary side single-phase current maximum load RL2Then X ═ RL1/RL2To, forXThe number N of the current transformers can be obtained by roundingm＝[RL1/RL2]＝[X]；
(2) The primary side coils of a plurality of active compensation current transformers 2 are connected in series and then connected in series with a standard meter 4, a wave recorder 3 and a three-phase source 1, and secondary side coils of the current transformers 2 are connected with equipment to be tested; when the current transformers 2 are connected with the equipment to be tested, the secondary side coils of the current transformers which are not connected with the equipment to be tested are in short circuit, the subsequent testing process is the same as the three-phase source testing, and the specific connection mode is shown in fig. 2.
In order to determine the turns of the primary coil and the secondary coil, the transformer is used for detecting a table body, primary current comes from a three-phase source of the detecting table body, and secondary current comes to detected equipment, so the turns of the primary coil and the secondary coil need to be equal.
When the equipment to be detected is detected, the method further comprises a detection step, which specifically comprises the following steps:
(21) acquiring current values of all paths output by the current transformer to obtain a total current output value;
(22) the error of the current transformer is detected by adopting a differential method, namely, the detected CT is compared with a standard CT with the same current ratio, the current booster supplies the same primary current to the standard CT and the detected CT, a secondary loop I2 of the standard CT passes through a standard loop of a transformer calibrator, delta I of the detected CT and a secondary loop I2 of the standard CT flows into a differential loop of the transformer calibrator, and then the transformer calibrator calculates error data;
(23) and controlling the output of the three-phase source by a computer, comparing the difference value between the total current output value and the output value of the three-phase source with an error threshold value, if the difference value is smaller than the error threshold value, generating no alarm information, and continuing to test, otherwise, stopping the test, and reading the alarm information of the mutual inductor.
The detection platform body controls the output of the three-phase source and calls the current value I of the tested equipmentdAccumulating the currents of all paths to obtain output current I' and three-phase source output value I1Setting the standard error grade as △ epsilon, and obtaining the current accumulation of each path to obtain the output current I' and the standard three-phase source output value I1The method for controlling the alarm circuit by the error comprises the following steps:
is provided with1＝Ix，I'＝Iy，△ε＝ε1；
If: if the information is not generated, the test is continued;
if: and if the I (Ix-Iy)/Ix I is larger than epsilon 1, triggering an alarm circuit to generate alarm information, stopping testing and reading the alarm information of the mutual inductor.
The detection process comprises two data processes: one is used for calculating the error of the current transformer, designing active compensation and reducing the test error; the other is used for the bench body test and the computer records data and alarm processing, and the corresponding test formula is calculated as follows:
RL1＝UxImax；
ε＝(I'-I1)/I1；
the specific judging method comprises the following steps:
is provided with1＝Ix，I'＝Iy，△ε＝ε1；
If: if the information is not generated, the test is continued;
if: and if (Ix-Iy)/Ix > epsilon 1, triggering an alarm circuit to generate alarm information and stopping testing.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (4)
1. A power equipment testing method based on an active compensation mutual inductor and a three-phase source is characterized by comprising the following steps: adding current transformers at the output ends of the three-phase sources, wherein the number of the current transformers is determined according to the maximum load of single-phase current of the three Hunan sources; and a primary side coil of the current transformer is connected in series and then connected in series with the standard meter, the wave recorder and the three-phase source, and a secondary side coil of the current transformer is connected with the equipment to be tested.
2. The power equipment testing method based on the active compensation mutual inductor and the three-phase source according to claim 1, characterized in that:
when the plurality of current transformers are connected with the equipment to be tested, the secondary side coils of the current transformers which are not connected with the equipment to be tested need to be in short circuit.
3. The power equipment testing method based on the active compensation mutual inductor and the three-phase source according to claim 1, characterized in that: when the equipment to be detected is detected, the method further comprises a detection step, which specifically comprises the following steps:
(1) acquiring current values of all paths output by the current transformer to obtain current output values;
(2) and comparing the difference value between each output value of the current and the output value of the three-phase source with an error threshold value, if the difference value of each path is smaller than the error threshold value, generating no alarm information, and continuing to test, otherwise, stopping the test, and reading the alarm information of the mutual inductor.
4. The power equipment testing method based on the active compensation mutual inductor and the three-phase source according to claim 1, characterized in that: and the turns of the primary coil and the secondary coil of the current transformer are equal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111443322A (en) * | 2020-04-20 | 2020-07-24 | 国网辽宁省电力有限公司电力科学研究院 | Fine regulator of alternating current instrument testing device |
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