CN118131110A - Voltage transformer error characteristic simulation test platform and test method thereof - Google Patents
Voltage transformer error characteristic simulation test platform and test method thereof Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
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Abstract
The invention discloses a voltage transformer error characteristic simulation test platform and a test method thereof, relating to the technical field of electric measurement and comprising a program control source; a transformer group including a first transformer and a second transformer; the wire inlet side transformer group comprises a first wire inlet side transformer group and a second wire inlet side transformer group; the outgoing line side transformer group comprises a first outgoing line side transformer group and a second outgoing line side transformer group; and simulating a load, wherein the incoming line side transformer group and the outgoing line side transformer group are connected with a return control source through N lines. The invention has the beneficial effects that the test platform can finish the operation modes of various transformers without switching equipment by selecting the design of wiring, the phenomenon of unstable platform output signals caused by the change of internal impedance due to the long-term operation of the switching equipment is avoided, the simulation load which can be developed for the second time is increased after the platform transformer, and the evaluation accuracy of the test platform is improved by simulating the real user load of the transformer substation.
Description
Technical Field
The invention relates to the technical field of electric measurement, in particular to a voltage transformer error characteristic simulation test platform and a test method thereof.
Background
The voltage transformer is used as one of key equipment in a power system and is widely applied to the fields of voltage measurement, protection, control and the like. The measurement accuracy of the voltage transformer is critical to the reliable operation of the power system. However, in practical applications, the performance of the voltage transformer may vary due to manufacturing processes, environmental conditions, aging caused by long-term use, and the like, resulting in measurement errors. In order to ensure the reliability and accuracy of the voltage transformer, it is often necessary to perform an error characterization simulation test. Such tests are intended to simulate the performance of a voltage transformer under various operating conditions, including normal operation, overload, temperature variations, etc. To perform these tests, a dedicated test platform is required to provide accurate and controllable voltage inputs to simulate various actual conditions.
At present, the existing test platform is switched through switch equipment when simulating different operation modes of a voltage transformer, the impedance of the switch equipment is changed due to long-term live switching, output waveforms are unstable and influence the evaluation of real errors of the voltage transformer, and the actual load is not hung on the transformer by the platform although the low-voltage transformer is used when simulating different voltage grades, so that the actual change of the transformer operation time transformation ratio is not changed, the situation that the output of the transformer in an actual transformer substation is changed along with the actual load change of a user is not consistent, and the operation situation of the voltage transformer in the actual transformer substation cannot be completely met.
Disclosure of Invention
The present invention has been made in view of the above-mentioned problems occurring in the prior art.
The invention aims to provide a voltage transformer error characteristic simulation test platform and a test method thereof, and aims to solve the problems that the internal impedance is changed due to the electrified switching of switch equipment and the data accuracy of the platform is low due to the fact that an actual load is not hung on the existing test platform.
In order to solve the technical problems, the invention provides the following technical scheme: the voltage transformer error characteristic simulation test platform comprises a program control source, wherein the program control source comprises an A-phase bus, a B-phase bus, a C-phase bus and an N line;
The transformer group comprises a first transformer and a second transformer, and the first transformer and the second transformer are respectively connected with a program control source;
The wire inlet side transformer group comprises a first wire inlet side transformer group and a second wire inlet side transformer group, wherein the first wire inlet side transformer group is connected in parallel to the wire inlet side of the first transformer, and the second wire inlet side transformer group is connected in parallel to the wire inlet side of the second transformer;
The outgoing line side transformer group comprises a first outgoing line side transformer group and a second outgoing line side transformer group, wherein the first outgoing line side transformer group is connected in parallel to the outgoing line side of the first transformer, and the second outgoing line side transformer group is connected in parallel to the outgoing line side of the second transformer;
the incoming line side transformer group and the outgoing line side transformer group are connected with a return stroke control source through N lines.
As a preferable scheme of the voltage transformer error characteristic simulation test platform, the invention comprises the following steps: and an analog load is also arranged between the transformer group and the outgoing line side transformer group.
As a preferable scheme of the voltage transformer error characteristic simulation test platform, the invention comprises the following steps: the first incoming line side transformer group and the second incoming line side transformer group comprise three voltage transformers, and the three voltage transformers are respectively connected in parallel to an A-phase bus, a B-phase bus and a C-phase bus.
As a preferable scheme of the voltage transformer error characteristic simulation test platform, the invention comprises the following steps: the first outgoing line side transformer group and the second outgoing line side transformer group comprise four groups of voltage transformers, each group of voltage transformers comprises three voltage transformers, and the three voltage transformers are respectively connected in parallel to an A-phase bus, a B-phase bus and a C-phase bus.
As a preferable scheme of the voltage transformer error characteristic simulation test platform, the invention comprises the following steps: the accuracy grade of each voltage transformer is 0.2 level, the adjustable range of the ratio difference is +/-0.50%, and the adjustable range of the phase difference is +/-50.0'.
As a preferable scheme of the voltage transformer error characteristic simulation test platform, the invention comprises the following steps: the voltage transformer comprises a primary side winding and a secondary side winding, wherein the secondary side winding adopts a sectional type and is divided into a fixed winding and an adjustable winding;
and the two ends of the fixed winding and the adjustable winding are connected with impedance in parallel.
As a preferable scheme of the voltage transformer error characteristic simulation test platform, the invention comprises the following steps: the adjustable winding adopts multistage adjustment inside, and includes one-level winding, the secondary winding of parallelly connected at one-level winding both ends and the tertiary winding of parallelly connected at secondary winding both ends, wherein, the numerical value of one-level winding is 10 times of secondary winding, and the numerical value of secondary winding is 10 times of tertiary winding.
As a preferable scheme of the test method for the voltage transformer error characteristic simulation test platform, the invention comprises the following steps: comprises the steps of,
Designing a test platform according to the experimental requirements;
Performing topology structure simulation of various voltage transformers;
The program control source supplies power to the transformer to enable the voltage transformer to stably run for a time t;
the multichannel calibrator is connected to a sampling point, acquires actual signals of a program control source, and calculates standard signals of the voltage transformer;
acquiring the ratio difference and the phase difference of the voltage transformer, and calculating to obtain error data of the voltage transformer;
and comparing the error data of the voltage transformer with the standard signal of the voltage transformer to obtain an evaluation result.
As a preferable scheme of the test method for the voltage transformer error characteristic simulation test platform, the invention comprises the following steps: the voltage transformer topology simulation includes the following ways,
When the analog double buses are operated in parallel, the program control source supplies power to the two transformers simultaneously, the incoming line side transformer group is selected as a voltage transformer on one side, and the two voltage transformers in the first outgoing line side transformer group or the two voltage transformers in the second outgoing line side transformer group are selected as voltage transformers on the other side;
When high-voltage parallel low-voltage split is simulated, the program control source supplies power to the two transformers simultaneously, the incoming line side transformer group is selected as a voltage transformer on one side to serve as a voltage transformer for high-voltage parallel operation, one group of voltage transformers in the first outgoing line side transformer group is arbitrarily selected, and one group of voltage transformers in the second outgoing line side transformer group is arbitrarily selected at the same time to serve as a voltage transformer for low-voltage split operation;
When the high-voltage parallel operation is simulated, program-controlled sources respectively provide power supplies with inconsistent voltages for the two transformers, the incoming line side transformer groups are selected to serve as the two voltage transformers for the high-voltage parallel operation, and the two voltage transformers in the first outgoing line side transformer group or the two voltage transformers in the second outgoing line side transformer group are selected to serve as the voltage transformers for the low-voltage parallel operation;
When a plurality of groups of voltage transformers are operated in a common source mode in a 3/2 circuit breaker wiring mode, the program control source supplies power to the two transformers simultaneously, at the moment, 4 groups of voltage transformers in the first outgoing line side transformer group are the plurality of groups of voltage transformers operated in the common source mode, and meanwhile, 4 groups of voltage transformers in the first outgoing line side transformer group are the plurality of groups of voltage transformers operated in the common source mode.
As a preferable scheme of the test method for the voltage transformer error characteristic simulation test platform, the invention comprises the following steps: and the standard signal of the voltage transformer and the error data of the voltage transformer are calculated by a difference method.
The voltage transformer error characteristic simulation test platform and the test method thereof have the beneficial effects that: the test platform can complete operation modes of various transformers without switching equipment by selecting wiring design, the phenomenon that the output signals of the platform are unstable due to internal impedance change caused by long-term operation of the switching equipment is avoided, the simulation load which can be secondarily developed is increased after the platform transformer, and the evaluation accuracy of the test platform is improved by simulating the real user load of the transformer substation.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall circuit of the test platform of the present invention.
FIG. 2 is a schematic diagram of the circuit wiring of the test platform of the present invention.
Fig. 3 is a schematic diagram of sampling points of the multi-channel calibrator in the present invention.
Fig. 4 is a schematic diagram of the internal windings of the voltage transformer according to the present invention.
Fig. 5 is a schematic diagram of an adjustable winding inside a voltage transformer according to the present invention.
In the figure: 100. a transformer bank; 101. a first transformer; 102. a second transformer; 200. a wire inlet side transformer group; 201. a first incoming line side transformer group; 202. a second incoming line side transformer group; 300. a outgoing line side transformer group; 301. a first outgoing side transformer group; 302. a second outgoing line side transformer group; 400. a program controlled source; 500. simulating a load; 601. a primary winding; 602. a secondary side winding; 602a, fixing windings; 602b, an adjustable winding; 603. an impedance; 602b-1, primary winding; 602b-2, secondary winding; 602b-3, three-stage windings.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1, fig. 2, fig. 4 and fig. 5, a voltage transformer error characteristic simulation test platform is provided according to a first embodiment of the present invention, where the test platform includes a program control source 400, and the program control source 400 is connected to A, B, C three-phase bus and N lines, and can provide an ac power source with adjustable parameters, so as to supply power to the transformer set 100.
The transformer group includes a first transformer 101 and a second transformer 102, and a transformation ratio of the first transformer 101 to the second transformer 102 is 1:1, the terminals of the first transformer 101 and the second transformer 102 are respectively connected to A, B, C a three-phase bus bar and N lines.
The incoming line side of the transformer set 100 is connected with the incoming line side transformer set 200, specifically, the first incoming line side transformer set 201 is connected with the incoming line side of the first transformer 101, the second incoming line side transformer set 202 is connected with the incoming line side of the second transformer 102, and the first incoming line side transformer set 201 and the second incoming line side transformer set 202 all comprise three voltage transformers which are respectively connected in parallel with A, B, C three-phase buses.
The outlet side of the transformer bank 100 is connected with a simulation load 500, the simulation load 500 can simulate the user load of the transformer substation, and the control of the change of the output signal of the transformer can be realized by inputting the user load change curve of the transformer.
The outgoing line side of the transformer set 100 is further connected with an outgoing line side transformer set 300 after simulating the load 500, and the outgoing line side transformer set comprises a first outgoing line side transformer set 301 and a second outgoing line side transformer set 302, wherein the first outgoing line side transformer set 301 is connected in parallel to the outgoing line side of the first transformer 101, and the second outgoing line side transformer set 302 is connected in parallel to the outgoing line side of the second transformer 102.
The first outgoing line side transformer group 301 and the second outgoing line side transformer group 302 include four groups of voltage transformers, each group of voltage transformers also includes three voltage transformers, and the three voltage transformers are respectively connected in parallel to an a-phase bus, a B-phase bus and a C-phase bus.
The voltage transformer is connected with the return control source 400 through an N line.
Specifically, the ratio difference and phase difference adjusting function is realized by adopting a coil mode in each voltage transformer. Each voltage transformer comprises a primary side winding 601 and a secondary side winding 602, wherein the secondary side winding 602 is divided into a fixed winding 602a and an adjustable winding 602b by adopting sectional type, and two ends of the fixed winding 602a and the adjustable winding 602b are connected with an impedance 603 in parallel.
Preferably, the adjustable winding 602b adopts multi-stage adjustment, including a primary winding 602b-1, two ends of the primary winding 602b-1 are connected with a secondary winding 602b-2 in parallel, the number of the primary winding 602b-1 is 10 times that of the secondary winding 602b-2, two ends of the secondary winding 602b-2 are connected with a tertiary winding 602b-3 in parallel, and the number of the secondary winding 602b-2 is 10 times that of the tertiary winding 602 b-3.
In conclusion, the design avoids the use of switch equipment through a selective wiring mode, and ensures that the phenomenon of unstable platform signals caused by internal impedance change can not occur when the test platform operates for a long time.
Example 2
Referring to fig. 1-3, a second embodiment of the present invention includes a test method for a voltage transformer error characterization simulation test platform, comprising the steps of,
S1, designing a test platform according to experimental requirements;
The experiment platform provides an alternating current power supply with adjustable parameters through a program control source, ensures that alternating current with the same parameters or different parameters can be provided for a transformer group, carries out high-voltage side parallel or split simulation, and the transformation ratio of two transformers is still 1:1, an analog load is connected to the outgoing line side of the transformer, and a transformer load change curve is selected and input to the analog load, so that control of a transformer output signal is realized.
And the voltage transformers are respectively connected to the inlet wire side and the outlet wire side of the two transformers, and the simulation of the topological structure of the voltage transformers is carried out by selecting the actual running conditions of the voltage transformers.
Specifically, three transformer groups at each position are respectively connected with A, B, C three-phase buses, the accuracy level of each voltage transformer is 0.2 level, the adjustable range of the ratio difference is +/-0.50%, and the adjustable range of the phase difference is +/-50.0'.
S2, simulating the topological structures of various voltage transformers;
The platform builds the simulation of various voltage transformer operation topological structures by a selective wiring mode, including the following simulation working conditions,
When the simulation double buses operate in parallel, the program control source supplies power to the two transformers simultaneously, the incoming line side transformer group is selected to serve as a voltage transformer on one side, and the two voltage transformers in the first outgoing line side transformer group or the two voltage transformers in the second outgoing line side transformer group are selected to serve as voltage transformers on the other side.
When high-voltage parallel low-voltage distribution is simulated, the program control source supplies power to the two transformers simultaneously, the incoming line side transformer group is selected as a voltage transformer on one side to serve as a voltage transformer for high-voltage parallel operation, one group of voltage transformers in the first outgoing line side transformer group is arbitrarily selected, and one group of voltage transformers in the second outgoing line side transformer group is arbitrarily selected at the same time to serve as a voltage transformer for low-voltage distribution operation.
When the high-voltage parallel operation is simulated, program-controlled sources respectively provide power supplies with inconsistent voltages for the two transformers, the incoming line side transformer groups are selected to serve as the two voltage transformers for the high-voltage parallel operation, and the two voltage transformers in the first outgoing line side transformer group or the two voltage transformers in the second outgoing line side transformer group are selected to serve as the voltage transformers for the low-voltage parallel operation.
When a plurality of groups of voltage transformers are operated in a common source mode in a 3/2 circuit breaker wiring mode, the program control source can supply power to two transformers simultaneously or can supply power to two transformers separately, at the moment, 4 groups of voltage transformers in the first outgoing line side transformer group are the plurality of groups of voltage transformers operated in the common source mode, and meanwhile, 4 groups of voltage transformers in the first outgoing line side transformer group are the plurality of groups of voltage transformers operated in the common source mode.
S3, supplying power to the transformer by the program control source so that the voltage transformer can stably run for a time t;
The voltage transformer stably operates for a period of time t, so that the collected sampling data is more stable, and the error of the waveform is smaller.
S4, the multichannel calibrator is connected to a sampling point, acquires actual signals of a program control source, and calculates standard signals of the voltage transformer;
The standard signal sampling points are deployed at four key points output by a program control source, wherein the points are standard signal providers of each line and independently enter a standard channel of the multi-channel calibrator 700, 701 is a standard signal of a first incoming line side transformer group, 702 is a standard signal of a second incoming line side transformer group, 703 is a standard signal of the first outgoing line side transformer group, and 704 is a standard signal of the second outgoing line side transformer group.
The multichannel calibrator calculates the error of each voltage transformer by a difference method in the measurement of the error of the transformer, and the obtained value is a standard signal of each voltage transformer in operation.
S5, acquiring the ratio difference and the phase difference of the voltage transformer, and calculating to obtain error data of the voltage transformer;
and (3) operating the test platform for a period of time, and calculating the ratio difference and the phase difference of the voltage transformer through the test platform to obtain actual error data of the voltage transformer.
S6, comparing error data of the voltage transformer with standard signals of the voltage transformer to obtain an evaluation result.
And comparing the actual error data of the voltage transformer obtained through the test platform with a standard signal calculated by the multi-channel calibrator, and evaluating the accuracy of the monitoring device of the transformer.
Example 3
Referring to fig. 2, an example of the third embodiment of the present invention is further provided, and an error characteristic evaluation test is performed on an online monitoring device for measuring performance of a voltage transformer of a manufacturer, so as to detect accuracy of the operation voltage transformer error calculation evaluation algorithm.
Firstly, a test platform is built, and a double-bus parallel operation mode is selected in the embodiment. The voltage transformer metering performance on-line monitoring device produced by a manufacturer is 4 groups of 12 voltage signal acquisition channels, the 1 st group of three channels are parallel to the first incoming line side transformer group 201 of the test platform and are respectively connected with the three voltage transformers in parallel, the 2 nd group of three channels are parallel to the second incoming line side transformer group 202 and are respectively connected with the three voltage transformers in parallel, the 3 rd group of three channels are parallel to the first group of transformers in the first outgoing line side transformer group 301 and are respectively connected with the three transformers in the first group of transformers in parallel, the 4 th group of three channels are parallel to the second group of transformers in the first outgoing line side transformer group 301 and are respectively connected with the three transformers in the second group of transformers in parallel. Thus, the connection of the 4 groups of 12 voltage signals is completed.
Secondly, a transformer load change curve is selected and recorded in the simulated load 500 connected with the first transformer by the simulated load 500, the output signal of the transformer is controlled, and as for the specific selection of which transformer load change curve, the load change curve is formulated according to the actual user load capacity of the local transformer substation.
Starting a program control source 400 of a platform, running the platform in a charged mode, adjusting the ratio difference and the phase difference of a first incoming line side transformer group 201, a second incoming line side transformer group 202, a first outgoing line side transformer group 301 and a second outgoing line side transformer group 302, after adjustment, enabling output signals of the first incoming line side transformer group 201, the second incoming line side transformer group 202, the first outgoing line side transformer group 301 and the second outgoing line side transformer group 302 to be connected into a multichannel calibrator 700, wherein the standard signals 701 and 702 of the first incoming line side transformer group 201 and the second incoming line side transformer group 202 are the same, the signal 703 is the standard signal of the first outgoing line side transformer group 301 and the second outgoing line side transformer group 302, and the multichannel calibrator 700 calculates the real error of the first incoming line side transformer group 201, the second incoming line side transformer group 202, the first outgoing line side transformer group 301 and the second outgoing line side transformer group 302 after adjustment error is obtained by a difference method, and the error is used as the standard signal. The error of the first incoming line side transformer group 201, the second incoming line side transformer group 202, the first outgoing line side transformer group 301 and the second outgoing line side transformer group 302 obtained by calculation through the multichannel calibrator is respectively: +0.04%, 1.5'; +0.05%, 1.5'; +0.12%, 0.5'; +0.38%, 16.0'.
The test platform operates for a period of time t, and the ratio difference and the phase difference of the first incoming line side transformer group 201, the second incoming line side transformer group 202, the first outgoing line side transformer group 301 and the second outgoing line side transformer group 302 are calculated to obtain the actual errors of the first incoming line side transformer group 201, the second incoming line side transformer group 202, the first outgoing line side transformer group 301 and the second outgoing line side transformer group 302 which are respectively +0.10% and 2.0'; +0.10%, 2.5'; +0.02% -0.5'; +0.45%, 14.1'.
Comparing actual error data of a test platform with standard signals obtained by calculation of a multi-channel calibrator to obtain error deviations of-0.06 percent and 2.0' of a first incoming line side transformer group 201, a second incoming line side transformer group 202, a first outgoing line side transformer group 301 and a second outgoing line side transformer group 302 calculated by a voltage transformer metering performance on-line monitoring device produced by a certain manufacturer; -0.05%, 1.0'; +0.10%, 1.0'; -0.07%, 1.9'. In the four groups of voltage transformers, the deviation of the calculated results is +0.10% and 1.9 ', and the accuracy of error characteristic assessment is +/-0.1% and 2.0' under the running mode that double-bus parallel running is judged by the voltage transformer metering performance on-line monitoring device produced by the manufacturer.
In conclusion, a virtual load control unit is added behind the transformer, the unit can change according to the condition that the transformer in the transformer substation changes along with the load of a user, the consistency of the test platform and a real transformer substation is greatly improved, and inaccuracy of evaluation of a voltage transformer metering performance on-line monitoring algorithm caused by the fact that primary and secondary signals of the transformer are in a fixed proportion due to the fact that the load of the internal transformer of the current test platform is unchanged is avoided.
It is important to note that the construction and arrangement of the application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of present application. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. Any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present applications.
Furthermore, in order to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those not associated with the best mode presently contemplated for carrying out the invention, or those not associated with practicing the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a voltage transformer error characteristic simulation test platform which characterized in that: comprising the steps of (a) a step of,
A programmable source (400), the programmable source (400) comprising an a-phase bus, a B-phase bus, a C-phase bus, and an N-line;
a transformer group (100) comprising a first transformer (101) and a second transformer (102), the first transformer (101) and the second transformer (102) being respectively connected with a program controlled source (400);
The wire inlet side transformer group (200) comprises a first wire inlet side transformer group (201) and a second wire inlet side transformer group (202), wherein the first wire inlet side transformer group (201) is connected in parallel to the wire inlet side of the first transformer (101), and the second wire inlet side transformer group (202) is connected in parallel to the wire inlet side of the second transformer (102);
the outgoing line side transformer group (300) comprises a first outgoing line side transformer group (301) and a second outgoing line side transformer group (302), wherein the first outgoing line side transformer group (301) is connected in parallel to the outgoing line side of the first transformer (101), and the second outgoing line side transformer group (302) is connected in parallel to the outgoing line side of the second transformer (102);
the incoming line side transformer group (200) and the outgoing line side transformer group (300) are connected with a return control source (400) through N lines.
2. The voltage transformer error characteristic simulation test platform of claim 1, wherein: an analog load (500) is further arranged between the transformer group (100) and the outgoing line side transformer group (300).
3. The voltage transformer error characteristic simulation test platform of claim 2, wherein: the first incoming line side transformer group (201) and the second incoming line side transformer group (202) comprise three voltage transformers which are respectively connected in parallel to A, B, C three-phase buses.
4. The voltage transformer error characterization simulation test platform of claim 3, wherein: the first outgoing line side transformer group (301) and the second outgoing line side transformer group (302) comprise four groups of voltage transformers, each group of voltage transformers comprises three voltage transformers, and the three voltage transformers are respectively connected in parallel to an A-phase bus, a B-phase bus and a C-phase bus.
5. The voltage transformer error characterization simulation test platform of claim 4, wherein: the accuracy grade of each voltage transformer is 0.2 level, the adjustable range of the ratio difference is +/-0.50%, and the adjustable range of the phase difference is +/-50.0'.
6. The voltage transformer error characterization simulation test platform of claim 5, wherein: the voltage transformer comprises a primary side winding (601) and a secondary side winding (602), wherein the secondary side winding (602) is divided into a fixed winding (602 a) and an adjustable winding (602 b) by adopting a sectional type;
the two ends of the fixed winding (602 a) and the adjustable winding (602 b) are connected with an impedance (603) in parallel.
7. The voltage transformer error characterization simulation test platform of claim 6, wherein: the adjustable winding (602 b) internally adopts multistage adjustment and comprises a primary winding (602 b-1), a secondary winding (602 b-2) connected in parallel with two ends of the primary winding (602 b-1) and a tertiary winding (602 b-3) connected in parallel with two ends of the secondary winding (602 b-2), wherein the numerical value of the primary winding (602 b-1) is 10 times that of the secondary winding (602 b-2), and the numerical value of the secondary winding (602 b-2) is 10 times that of the tertiary winding (602 b-3).
8. A test method for a voltage transformer error characteristic simulation test platform is characterized by comprising the following steps of: comprises the steps of,
Designing a test platform according to the experimental requirements;
Performing topology structure simulation of various voltage transformers;
The program control source supplies power to the transformer to enable the voltage transformer to stably run for a time t;
the multichannel calibrator is connected to a sampling point, acquires actual signals of a program control source, and calculates standard signals of the voltage transformer;
acquiring the ratio difference and the phase difference of the voltage transformer, and calculating to obtain error data of the voltage transformer;
and comparing the error data of the voltage transformer with the standard signal of the voltage transformer to obtain an evaluation result.
9. The assay method of claim 8, wherein: the voltage transformer topology simulation includes the following ways,
When the analog double buses are operated in parallel, the program control source supplies power to the two transformers simultaneously, the incoming line side transformer group is selected as a voltage transformer on one side, and the two voltage transformers in the first outgoing line side transformer group or the two voltage transformers in the second outgoing line side transformer group are selected as voltage transformers on the other side;
When high-voltage parallel low-voltage split is simulated, the program control source supplies power to the two transformers simultaneously, the incoming line side transformer group is selected as a voltage transformer on one side to serve as a voltage transformer for high-voltage parallel operation, one group of voltage transformers in the first outgoing line side transformer group is arbitrarily selected, and one group of voltage transformers in the second outgoing line side transformer group is arbitrarily selected at the same time to serve as a voltage transformer for low-voltage split operation;
When the high-voltage parallel operation is simulated, program-controlled sources respectively provide power supplies with inconsistent voltages for the two transformers, the incoming line side transformer groups are selected to serve as the two voltage transformers for the high-voltage parallel operation, and the two voltage transformers in the first outgoing line side transformer group or the two voltage transformers in the second outgoing line side transformer group are selected to serve as the voltage transformers for the low-voltage parallel operation;
When a plurality of groups of voltage transformers are operated in a common source mode in a 3/2 circuit breaker wiring mode, the program control source supplies power to the two transformers simultaneously, at the moment, 4 groups of voltage transformers in the first outgoing line side transformer group are the plurality of groups of voltage transformers operated in the common source mode, and meanwhile, 4 groups of voltage transformers in the first outgoing line side transformer group are the plurality of groups of voltage transformers operated in the common source mode.
10. The assay method of claim 9, wherein: and the standard signal of the voltage transformer and the error data of the voltage transformer are calculated by a difference method.
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