CN106772198B - Method, system and device for testing transient response characteristics of direct current transformer - Google Patents
Method, system and device for testing transient response characteristics of direct current transformer Download PDFInfo
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- 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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Abstract
The embodiment of the application discloses a method, a system and a device for testing transient response characteristics of a direct current transformer, wherein the step response characteristics of the direct current transformer are tested by acquiring a step signal standard value generated by a transient source standard device of the direct current transformer and a step signal actual value generated by the tested direct current transformer; according to the transient signal standard value of the transient source standard device of the direct current transformer and the transient signal actual value of the tested direct current transformer, the test of the condition transient state pass characteristics of the direct current transformer under different fault modes is realized; and comprehensively evaluating the transient response characteristic of the tested direct current transformer according to the two test results, and improving the integrity of the test of the transient response characteristic of the tested direct current transformer.
Description
Technical Field
The application relates to the technical field of transient response characteristic test of direct current transformers, in particular to a method, a system and a device for testing transient response characteristics of a direct current transformer.
Background
The direct current transformer is widely applied to a direct current transformer station at present, is an important device for measuring the current of a direct current transmission system, and can provide accurate and reliable direct current signals for the control and protection of the direct current transmission system.
The field transient response characteristic test and the preventive test before the installation of the direct current transformer and the period monitoring are important works for ensuring the safe operation of a direct current transmission system. However, at present, the dc electronic current transformer is generally rarely subjected to transient test on site, and related test methods and bases are lacking. The conventional transient response characteristic test method of the direct current transformer usually makes an initial conclusion directly according to the experimental waveform of the field.
The conventional transient response characteristic test method of the direct current transformer is required to be improved in test integrity, so that it is necessary to provide a method, a system and a device for testing the transient response characteristic of the direct current transformer so as to improve the integrity of the transient response characteristic test of the direct current transformer.
Disclosure of Invention
The application provides a method, a system and a device for testing transient response characteristics of a direct current transformer, which are used for solving the problem that the integrity of the conventional method for testing the transient response characteristics of the direct current transformer is to be improved.
In a first aspect, the present application provides a method for testing transient response characteristics of a dc current transformer, where the method includes:
obtaining a step signal standard value and a step signal actual value, wherein the step signal standard value is generated by a transient source standard device of a direct current transformer, and the step signal actual value is obtained according to a secondary signal of the measured direct current transformer;
calculating step signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer according to the step signal standard value and the step signal actual value;
acquiring a transient signal standard value and a transient signal actual value, wherein the transient signal standard value is a transient signal standard value of a direct current transformer transient source standard device for simulating a direct current transmission system under different faults, and the transient signal actual value is obtained according to a secondary signal of a tested direct current transformer;
calculating transient signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer according to the transient signal standard value and the transient signal actual value;
and evaluating transient response characteristics of the tested direct current transformer according to the step signal error and the transient signal error.
With reference to the first aspect, in a first possible implementation manner of the first aspect, calculating a step signal error of the measured dc current transformer and the transient source standard device of the dc current transformer according to the step signal standard value and the step signal actual value includes:
and calculating the maximum overshoot error and the rise time error of the step response of the tested direct current transformer and the transient source standard device of the direct current transformer according to the standard value of the step signal and the actual value of the step signal.
With reference to the first aspect, in a second possible implementation manner of the first aspect, a transient signal standard value and a transient signal actual value are obtained, where the transient signal standard value is a transient signal standard value of a dc current transformer transient source standard device simulating a dc power transmission system under different faults, and the transient signal actual value is obtained according to a secondary signal of a measured dc current transformer, and the method includes:
obtaining a transient signal standard value, namely an alternating current component standard value and a direct current component standard value under each frequency, wherein the transient signal standard value is a transient signal standard value of a direct current transformer transient source standard device simulation direct current transmission system under the conditions of earth electrode line fault, polar line ground fault and short circuit fault;
And acquiring the actual value of the transient signal generated by the tested direct current transformer, and obtaining the actual value of the alternating current component and the actual value of the direct current component of the tested direct current transformer under each frequency.
With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, calculating a transient signal error of the measured dc current transformer and the transient source standard device of the dc current transformer according to the transient signal standard value and the transient signal actual value includes:
and calculating the transient response maximum peak value transient error, the composite error, the traveling wave and the transient error of the tested direct current transformer and the transient source standard device of the direct current transformer according to the alternating current component standard value, the direct current component standard value, the alternating current component actual value and the direct current component actual value.
With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the method further includes:
drawing an alternating current component standard value oscillogram under each frequency according to the alternating current component standard value;
drawing an actual value waveform chart of the alternating current component under each frequency according to the actual value of the alternating current component;
And evaluating the accuracy of the tested direct current transformer according to the matching degree of the alternating current component standard value waveform diagram and the alternating current component actual value waveform diagram.
With reference to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the method further includes:
and evaluating traveling wave and transient state quantity passing precision of the tested direct current transformer according to the correlation between the transient state signal standard value and the transient state signal actual value.
With reference to the first aspect, in a sixth possible implementation manner of the first aspect, the evaluating a transient response characteristic of the measured dc current transformer according to the step signal error and the transient signal error includes:
calculating the composite error of the tested direct current transformer according to a composite error calculation formula, wherein the composite error calculation formula is as follows:
wherein Ip is the square root of the primary transient current, T is a cycle period, K is a rated transformation ratio, is a transient signal standard value, ip is a secondary signal of the direct current transformer to be tested, and T is a time instantaneous value;
and according to the composite error, evaluating the transient response characteristic of the tested direct current transformer.
In a second aspect, the present application provides a system for testing transient response characteristics of a dc current transformer, the system comprising: the system comprises a direct current transformer transient source standard device and a direct current transformer transient response characteristic tester, wherein the direct current transformer transient response characteristic tester is respectively connected with the direct current transformer transient source standard device and a tested direct current transformer;
the transient source standard device of the direct current transformer comprises: the system comprises a main controller, a step current signal generator, a first filter, a first signal power amplifier, a step voltage signal generator, a second filter, a step voltage generator, a transient simulation signal generator of a direct current transmission system, a third filter, a second signal power amplifier, a transient source output device and a standard transient current transformer; the output end of the main controller is respectively connected with the input end of the step current signal generator the input end of the step voltage signal generator is connected with the input end of the transient simulation signal generator of the direct current transmission system; the output end of the step current signal generator is connected with the first the filter and the first signal power amplifier are connected in sequence; the output end of the step voltage signal generator is connected with the second filter and the step voltage generator in sequence; the output end of the transient simulation signal generator of the direct current transmission system is sequentially connected with the third filter and the second signal power amplifier; the first signal power amplifier the step voltage generator and the second signal power amplifier are respectively connected with the transient source output device; the transient source output device is connected with the standard transient current transformer; the standard transient current transformer is connected with the tested direct current transformer and the transient response characteristic tester of the direct current transformer;
The transient source standard device of the direct current transformer is used for generating a step signal standard value;
the measured direct current transformer is used for generating a step signal actual value;
the transient response characteristic tester of the direct current transformer is used for obtaining a step signal standard value and a step signal actual value, wherein the step signal standard value is generated by a transient source standard device of the direct current transformer, and the step signal actual value is obtained according to a secondary signal of the direct current transformer to be tested; calculating step signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer according to the step signal standard value and the step signal actual value; acquiring a transient signal standard value and a transient signal actual value, wherein the transient signal standard value is a transient signal standard value of a direct current transformer transient source standard device for simulating a direct current transmission system under different faults, and the transient signal actual value is obtained according to a secondary signal of a tested direct current transformer; calculating transient signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer according to the transient signal standard value and the transient signal actual value; and evaluating transient response characteristics of the tested direct current transformer according to the step signal error and the transient signal error.
With reference to the second aspect, in a first possible implementation manner of the second aspect, the system further includes a merging unit, and the transient response characteristic tester of the direct current transformer is provided with an analog quantity signal interface, a digital quantity signal interface and a synchronization interface;
the output end of the standard transient current transformer is connected with the analog quantity signal interface, and the output end of the tested direct current transformer is connected with the analog quantity signal interface;
the output end of the tested direct current transformer is also connected with the input end of the merging unit, and the output end of the merging unit is respectively connected with the digital quantity signal interface and the synchronous interface.
In a third aspect, the present application provides a device for testing transient response characteristics of a dc current transformer, the device comprising:
the step signal acquisition unit is used for acquiring a step signal standard value and a step signal actual value, wherein the step signal standard value is generated by a transient source standard device of the direct current transformer, and the step signal actual value is obtained according to a secondary signal of the direct current transformer to be tested;
the first calculation unit is used for calculating step signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer according to the step signal standard value and the step signal actual value;
The transient signal acquisition unit is used for acquiring a transient signal standard value and a transient signal actual value, wherein the transient signal standard value is a transient signal standard value of a direct current transformer transient source standard device simulation direct current transmission system under different faults, and the transient signal actual value is obtained according to a secondary signal of a tested direct current transformer;
the second calculation unit is used for calculating transient signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer according to the transient signal standard value and the transient signal actual value;
and the evaluation analysis unit is used for evaluating the transient response characteristic of the tested direct current transformer according to the step signal error and the transient signal error.
According to the technical scheme, the embodiment of the invention provides a method, a system and a device for testing transient response characteristics of a direct current transformer, wherein a step signal standard value and a step signal actual value are obtained, the step signal standard value is generated by a direct current transformer transient source standard device, and the step signal actual value is obtained according to a secondary signal of the direct current transformer to be tested; calculating step signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer according to the step signal standard value and the step signal actual value; the method comprises the steps of obtaining a transient signal standard value and a transient signal actual value, wherein the transient signal standard value is a transient signal standard value of a direct current transformer transient source standard device simulation direct current transmission system under different faults, and the transient signal actual value is obtained according to a secondary signal of a tested direct current transformer; according to the transient signal standard value and the transient signal actual value, calculating transient signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer; according to the step signal error and the transient signal error, evaluating transient response characteristics of the tested direct current transformer; according to the embodiment of the invention, the step response characteristic test of the direct current transformer is realized through the step signal standard value generated by the transient source standard device of the direct current transformer and the step signal actual value generated by the tested direct current transformer; according to the transient signal standard value of the transient source standard device of the direct current transformer and the transient signal actual value of the tested direct current transformer, the test of the condition transient state pass characteristics of the direct current transformer under different fault modes is realized; and comprehensively evaluating the transient response characteristic of the tested direct current transformer according to the two test results, and improving the integrity of the test of the transient response characteristic of the tested direct current transformer.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a flowchart of a method for testing transient response characteristics of a dc current transformer according to an embodiment of the present application;
fig. 2 is a schematic diagram of a transient response characteristic test system of a dc current transformer according to an embodiment of the present application;
fig. 3 is a structural block diagram of a transient source standard device in a transient response characteristic test system of a direct current transformer according to an embodiment of the present application;
fig. 4 is a block diagram of a transient response characteristic testing device for a dc current transformer according to an embodiment of the present application.
Illustration of: 1-a transient response characteristic tester of a direct current transformer; 2-a transient source standard device of the direct current transformer; 3-a direct current transformer to be measured; 11-step signal acquisition unit; 12-a first computing unit; 13-a transient signal acquisition unit; 14-a second calculation unit; 15-an evaluation analysis unit; 21-a main controller; 22-step current signal generator; 23-step voltage signal generator; 24-a transient simulation signal generator of the direct current transmission system; 25-a first filter; 26-a second filter; 27-a third filter; 28-a first signal power amplifier; 29-step voltage generator; 30-a second signal power amplifier; 31-a transient source outputter; 32-a standard transient current transformer; 33-a merging unit; 34-analog signal interface; 35-digital quantity signal interface; 36-synchronization interface.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
Referring to fig. 1, an embodiment of the present invention first provides a method for testing transient response characteristics of a dc current transformer, where the method includes:
s1, obtaining a step signal standard value and a step signal actual value, wherein the step signal standard value is generated by a transient source standard device of a direct current transformer, and the step signal actual value is obtained according to a secondary signal of the tested direct current transformer.
The step signal standard value generated by the transient source standard device of the direct current transformer, and the actual value of the step signal generated by the tested direct current transformer can realize the step response characteristic test of the direct current transformer.
And S2, calculating step signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer according to the step signal standard value and the step signal actual value.
Specifically, according to the step signal standard value and the step signal actual value, calculating the step signal error of the tested direct current transformer and the transient source standard device of the direct current transformer, including:
and S21, calculating the maximum overshoot error and the rise time error of the step response of the tested direct current transformer and the transient source standard device of the direct current transformer according to the standard value of the step signal and the actual value of the step signal.
And S3, acquiring a transient signal standard value and a transient signal actual value, wherein the transient signal standard value is a transient signal standard value of a direct current transformer transient source standard device simulation direct current transmission system under different faults, and the transient signal actual value is obtained according to a secondary signal of the tested direct current transformer.
According to the transient signal standard value of the transient source standard device of the direct current transformer and the transient signal actual value of the tested direct current transformer, the verification of the condition transient state pass characteristics of the direct current transformer under different fault modes can be realized.
Specifically, a transient signal standard value and a transient signal actual value are obtained, wherein the transient signal standard value is a transient signal standard value of a direct current transformer transient source standard device simulating a direct current transmission system under different faults, and the transient signal actual value is obtained according to a secondary signal of a measured direct current transformer and comprises the following steps:
step S31, obtaining a transient signal standard value, namely an alternating current component standard value and a direct current component standard value under each frequency, wherein the transient signal standard value is a transient signal standard value of a direct current transformer transient source standard device simulation direct current transmission system under the conditions of earth electrode line fault, polar line earth fault and short circuit fault;
and S32, acquiring the actual value of the transient signal generated by the tested direct current transformer, and obtaining the actual value of the alternating current component and the actual value of the direct current component of the tested direct current transformer under each frequency.
And S4, calculating transient signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer according to the transient signal standard value and the transient signal actual value.
Specifically, according to the transient signal standard value and the transient signal actual value, calculating the transient signal error of the tested direct current transformer and the transient source standard device of the direct current transformer, including:
And S41, calculating transient response maximum peak transient errors, composite errors, traveling waves and transient errors of the tested direct current transformer and the direct current transformer transient source standard device according to the alternating current component standard value, the direct current component standard value, the alternating current component actual value and the direct current component actual value.
And S5, evaluating transient response characteristics of the tested direct current transformer according to the step signal error and the transient signal error.
In particular, based on the step signal error and the transient signal error, the method for evaluating the transient response characteristics of the tested direct current transformer comprises the following steps:
step S51, calculating the composite error of the tested direct current transformer according to a composite error calculation formula, wherein the composite error calculation formula is as follows:
wherein Ip is the square root of the primary transient current, T is a cycle period, K is a rated transformation ratio, is a transient signal standard value, ip is the secondary signal of the tested direct current transformer, and T is a time instantaneous value.
And S52, evaluating transient response characteristics of the tested direct current transformer according to the composite error.
Further, the method further comprises:
Step S43, drawing an alternating current component standard value oscillogram under each frequency according to the alternating current component standard value;
step S44, drawing an actual value waveform chart of the alternating current component under each frequency according to the actual value of the alternating current component;
and step S45, evaluating the accuracy of the tested direct current transformer according to the matching degree of the alternating current component standard value waveform diagram and the alternating current component actual value waveform diagram.
Further, the method further comprises:
and S46, evaluating traveling wave and transient state quantity pass-through precision of the tested direct current transformer according to the correlation between the transient state signal standard value and the transient state signal actual value.
According to the method for testing the transient response characteristics of the direct current transformer, provided by the embodiment of the invention, synchronous verification is adopted, so that the related tests of the step characteristics, the maximum peak instantaneous errors, the compound errors, the traveling waves and the transient error verification of the tested direct current transformer can be completed; meanwhile, the system has the functions of comprehensive evaluation analysis, waveform drawing analysis, report generation and the like of the transient response characteristics of the tested direct current transformer, realizes the integrity test of the transient response characteristics of the tested direct current transformer, and improves the capability and effect of the transient response characteristic test of the direct current transformer.
From the above, the embodiment of the invention provides a method for testing transient response characteristics of a direct current transformer, wherein a step signal standard value and a step signal actual value are obtained, the step signal standard value is generated by a direct current transformer transient source standard device, and the step signal actual value is obtained according to a secondary signal of the direct current transformer to be tested; based on the standard value of the step signal and the actual value of the step signal, calculating step signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer; the method comprises the steps of obtaining a transient signal standard value and a transient signal actual value, wherein the transient signal standard value is a transient signal standard value of a direct current transformer transient source standard device simulation direct current transmission system under different faults, and the transient signal actual value is obtained according to a secondary signal of a tested direct current transformer; according to the transient signal standard value and the transient signal actual value, calculating transient signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer; according to the step signal error and the transient signal error, evaluating transient response characteristics of the tested direct current transformer; according to the embodiment of the invention, the step response characteristic test of the direct current transformer is realized through the step signal standard value generated by the transient source standard device of the direct current transformer and the step signal actual value generated by the tested direct current transformer; according to the transient signal standard value of the transient source standard device of the direct current transformer and the transient signal actual value of the tested direct current transformer, the test of the condition transient state pass characteristics of the direct current transformer under different fault modes is realized; and comprehensively evaluating the transient response characteristic of the tested direct current transformer according to the two test results, and improving the integrity of the test of the transient response characteristic of the tested direct current transformer.
Referring to fig. 2 to 3, an embodiment of the present invention further provides a system for testing transient response characteristics of a dc current transformer, the system includes: the system comprises a direct current transformer transient source standard device 2 and a direct current transformer transient response characteristic tester 1, wherein the direct current transformer transient response characteristic tester 1 is respectively connected with the direct current transformer transient source standard device 2 and a tested direct current transformer 3.
Wherein, the transient state source standard device 2 of the direct current transformer comprises: a main controller 21, a step current signal generator 22, a first filter 25, a first signal power amplifier 28, a step voltage signal generator 23, a second filter 26, a step voltage generator 29, a dc transmission system transient simulation signal generator 24, a third filter 27, a second signal power amplifier 30, a transient source output 31 and a standard transient current transformer 32.
The output end of the main controller 21 is respectively connected with the input end of the step current signal generator 22, the input end of the step voltage signal generator 23 and the input end of the transient simulation signal generator 24 of the direct current transmission system; the output of the step current signal generator 22 is connected in turn to the first filter 25 and the first signal power amplifier 28.
The output of the step voltage signal generator 23 is connected in turn to the second filter 26 and the step voltage generator 29.
The output end of the transient simulation signal generator 24 of the dc transmission system is sequentially connected to the third filter 27 and the second signal power amplifier 30.
The first signal power amplifier 28, the step voltage generator 29 and the second signal power amplifier 30 are connected to the transient source outputter 31, respectively.
The transient source outputter 31 is connected with the standard transient current transformer 32.
The standard transient current transformer 32 is connected with the tested direct current transformer 3 and the direct current transformer transient response characteristic tester 1.
The transient source standard device of the direct current transformer is used for generating a step signal standard value;
the measured direct current transformer is used for generating a step signal actual value;
the transient response characteristic tester of the direct current transformer is used for obtaining a step signal standard value and a step signal actual value, wherein the step signal standard value is generated by a transient source standard device of the direct current transformer, and the step signal actual value is obtained according to a secondary signal of the direct current transformer to be tested; calculating step signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer according to the step signal standard value and the step signal actual value; acquiring a transient signal standard value and a transient signal actual value, wherein the transient signal standard value is a transient signal standard value of a direct current transformer transient source standard device for simulating a direct current transmission system under different faults, and the transient signal actual value is obtained according to a secondary signal of a tested direct current transformer; calculating transient signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer according to the transient signal standard value and the transient signal actual value; and evaluating transient response characteristics of the tested direct current transformer according to the step signal error and the transient signal error.
The direct current transformer transient response characteristic tester 1 needs to simultaneously receive the standard signal generated by the direct current transformer transient source standard device 2 and the secondary signal of the tested direct current transformer 3.
The standard signal generated by the transient source standard device 2 of the direct current transformer is and a tested direct current transformer 3 transient response checking test standard.
The secondary signal of the tested direct current transformer 3 can be an analog output type, an IEC61850-9-1 digital output type IEC61850-9-2 digital quantity output type, FT3 digital quantity output type and other forms.
The system further comprises a merging unit 33, wherein the transient response characteristic tester 1 of the direct current transformer is provided with an analog quantity signal interface 34, a digital quantity signal interface 35 and a synchronous interface 36;
the output end of the standard transient current transformer 32 is connected with the analog quantity signal interface 34, and the output end of the tested direct current transformer 3 is connected with the analog quantity signal interface 34;
the output end of the tested direct current transformer 3 is also connected with the input end of the merging unit 33, and the output end of the merging unit 33 is respectively connected with the digital quantity signal interface 35 and the synchronous interface 36.
The analog signal interface 34 is used for performing collection filtering processing on the analog current value, and extracting direct current components of the analog current value under different frequencies to obtain a direct current value.
The digital quantity signal interface 35 is used for performing collection filtering processing on the digital quantity current value, extracting direct current components of the digital quantity current value under different frequencies, and obtaining a direct current digital quantity current value.
The signals of the transient source standard device 2 of the direct current transformer and the tested direct current transformer 3 are collected under the control of the synchronous signals so as to avoid delay difference caused by asynchronous sampling. The synchronous signal of the transient response characteristic tester 1 of the direct current transformer adopts light second pulse and IRIG-B output which meet the standard.
The transient state source standard device 2 of the direct current transformer is also provided with a film module (not shown) for providing power for the transient state source standard device 2 of the direct current transformer. The step current signal generator 22 generates a step current under the control of the main controller 21, and after filtering by the first filter 25, it is amplified by the first signal power amplifier 28 to generate a step primary current.
The step voltage signal generator 23 is filtered by the second filter 26, and is connected to a step voltage generator 29, and generates a voltage signal required by the system.
The signals generated by the transient simulation signal generator 24 of the direct current transmission system are filtered by the third filter 27, amplified by the second signal power amplifier 30 to generate transient direct current signals with different fault types, and then output to the standard transient current transformer 31 and the tested direct current transformer 3 through the transient source output device 31.
If the tested direct current transformer 3 is an analog output type, the secondary signal of the standard transient current transformer 31 and the secondary signal of the tested direct current transformer 3 are sent to the direct current transformer transient response characteristic tester 1 through an analog signal interface of the direct current transformer transient response characteristic tester 1, so that the test is completed.
If the measured direct current transformer 3 is a digital quantity output type, the secondary signal of the standard transient current transformer 31 is connected to the analog quantity signal interface of the direct current transformer transient response characteristic tester 1, and the measured direct current transformer 3 is connected to the digital quantity signal interface 35 and the synchronous interface 36 through the merging unit 33, so that the step response and the pass characteristic test of the measured direct current transformer 3 are completed.
The system for testing the transient response characteristics of the direct current transformer provided by the embodiment of the invention is compatible with different data transmission protocols and gives consideration to the access of digital quantity and analog quantity, thereby improving the compatibility and operability of the field.
From the above, the embodiment of the present invention provides a system for testing transient response characteristics of a dc current transformer, including: the system comprises a direct current transformer transient source standard device 2 and a direct current transformer transient response characteristic tester 1, wherein the direct current transformer transient response characteristic tester 1 is respectively connected with the direct current transformer transient source standard device 2 and a tested direct current transformer 3; the step signal standard value and the step signal actual value can be obtained through the direct current transformer transient response characteristic tester 1, the step signal standard value is generated by the direct current transformer transient source standard device 2, and the step signal actual value is obtained according to the secondary signal of the tested direct current transformer 3; calculating step signal errors of the tested direct current transformer 3 and the direct current transformer transient source standard device 2 according to the step signal standard value and the step signal actual value by the direct current transformer transient response characteristic tester 1; the transient response characteristic tester 1 of the direct current transformer is used for obtaining a transient signal standard value and a transient signal actual value, wherein the transient signal standard value is a transient signal standard value of a direct current transformer transient source standard device 2 for simulating a direct current transmission system under different faults, and the transient signal actual value is obtained according to a secondary signal of the direct current transformer 3 to be tested; calculating transient signal errors of the tested direct current transformer 3 and the transient source standard device 2 of the direct current transformer by the transient response characteristic tester 1 according to the transient signal standard value and the transient signal actual value; the transient response characteristic of the tested direct current transformer 3 is evaluated by the transient response characteristic tester 1 according to the step signal error and the transient signal error; according to the embodiment of the invention, the step response characteristic test of the direct current transformer is realized through the step signal standard value generated by the transient source standard device of the direct current transformer and the step signal actual value generated by the tested direct current transformer; according to the transient signal standard value of the transient source standard device of the direct current transformer and the transient signal actual value of the tested direct current transformer, the test of the condition transient state pass characteristics of the direct current transformer under different fault modes is realized; and comprehensively evaluating the transient response characteristic of the tested direct current transformer according to the two test results, and improving the integrity of the test of the transient response characteristic of the tested direct current transformer.
Referring to fig. 4, an embodiment of the present invention further provides a device for testing transient response characteristics of a dc current transformer, which is configured to execute the method for testing transient response characteristics of a dc current transformer according to the embodiment of the present invention, where the device includes:
the step signal obtaining unit 11 is configured to obtain a step signal standard value and a step signal actual value, where the step signal standard value is generated by a transient source standard device of the dc current transformer, and the step signal actual value is obtained according to a secondary signal of the detected dc current transformer.
The first calculating unit 12 is configured to calculate a step signal error between the measured dc current transformer and the transient source standard device of the dc current transformer according to the step signal standard value and the step signal actual value.
The transient signal obtaining unit 13 is configured to obtain a transient signal standard value and a transient signal actual value, where the transient signal standard value is a transient signal standard value of the dc current transformer transient source standard device in different faults of the dc power transmission system, and the transient signal actual value is obtained according to a secondary signal of the dc current transformer to be tested.
The second calculating unit 14 is configured to calculate a transient signal error between the measured dc current transformer and the transient source standard device of the dc current transformer according to the transient signal standard value and the transient signal actual value.
And the evaluation analysis unit 15 is used for evaluating the transient response characteristic of the tested direct current transformer according to the step signal error and the transient signal error.
In a specific implementation, the invention further provides a computer storage medium, wherein the computer storage medium can store a program, and the program can include part or all of the steps in each embodiment of the method for testing transient response characteristics of the direct current transformer. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), a random-access memory (random access memory, RAM), or the like.
It will be apparent to those skilled in the art that the techniques of embodiments of the present invention may be implemented in software plus a necessary general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be embodied in essence or what contributes to the prior art in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the embodiments or some parts of the embodiments of the present invention.
The same or similar parts between the various embodiments in this specification are referred to each other. In particular, for the embodiment of the device for testing the accuracy level of the direct current voltage transformer, which is provided by the invention, the description is relatively simple because the device is basically similar to the embodiment of the method, and the relevant points are referred to in the description of the embodiment of the method.
The embodiments of the present invention described above do not limit the scope of the present invention.
Claims (7)
1. The method for testing the transient response characteristics of the direct current transformer is characterized by comprising the following steps of:
obtaining a step signal standard value and a step signal actual value, wherein the step signal standard value is generated by a transient source standard device of a direct current transformer, and the step signal actual value is obtained according to a secondary signal of the measured direct current transformer;
calculating step signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer according to the step signal standard value and the step signal actual value;
the method comprises the steps of obtaining a transient signal standard value and a transient signal actual value, wherein the transient signal standard value is a transient signal standard value of a direct current transformer transient source standard device for simulating a direct current transmission system under different faults, and the transient signal actual value is obtained according to a secondary signal of a tested direct current transformer and comprises the following steps:
Obtaining a transient signal standard value, namely an alternating current component standard value and a direct current component standard value under each frequency, wherein the transient signal standard value is a transient signal standard value of a direct current transformer transient source standard device simulation direct current transmission system under the conditions of earth electrode line fault, polar line ground fault and short circuit fault;
acquiring an actual value of a transient signal generated by a tested direct current transformer, and obtaining an actual value of an alternating current component and an actual value of a direct current component of the tested direct current transformer under each frequency;
calculating transient signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer according to the transient signal standard value and the transient signal actual value;
according to the step signal error and the transient signal error, evaluating transient response characteristics of the tested direct current transformer;
according to the step signal standard value and the step signal actual value, calculating the step signal error of the tested direct current transformer and the transient source standard device of the direct current transformer, comprising:
calculating the maximum overshoot error and the rise time error of the step response of the tested direct current transformer and the transient source standard device of the direct current transformer according to the standard value of the step signal and the actual value of the step signal;
According to the step signal error and the transient signal error, evaluating transient response characteristics of the tested direct current transformer comprises the following steps:
calculating the composite error of the tested direct current transformer according to a composite error calculation formula, wherein the composite error calculation formula is as follows:
wherein Ip is the square root value of primary transient current, T is a cycle period, K is a rated transformation ratio, is a transient signal standard value, ip is a secondary signal of the tested direct current transformer, and T is a time instantaneous value;
and according to the composite error, evaluating the transient response characteristic of the tested direct current transformer.
2. The method of claim 1, wherein calculating the transient signal error of the dc current transformer under test and the transient source standard device of the dc current transformer based on the transient signal standard value and the transient signal actual value comprises:
and calculating the transient response maximum peak value transient error, the composite error, the traveling wave and the transient error of the tested direct current transformer and the transient source standard device of the direct current transformer according to the alternating current component standard value, the direct current component standard value, the alternating current component actual value and the direct current component actual value.
3. The method of claim 2, wherein the method further comprises:
drawing an alternating current component standard value oscillogram under each frequency according to the alternating current component standard value;
drawing an actual value waveform chart of the alternating current component under each frequency according to the actual value of the alternating current component;
and evaluating the accuracy of the tested direct current transformer according to the matching degree of the alternating current component standard value waveform diagram and the alternating current component actual value waveform diagram.
4. A method as claimed in claim 3, wherein the method further comprises:
and evaluating traveling wave and transient state quantity passing precision of the tested direct current transformer according to the correlation between the transient state signal standard value and the transient state signal actual value.
5. A system for testing transient response characteristics of a direct current transformer, the system comprising: the system comprises a direct current transformer transient source standard device and a direct current transformer transient response characteristic tester, wherein the direct current transformer transient response characteristic tester is respectively connected with the direct current transformer transient source standard device and a tested direct current transformer;
the transient source standard device of the direct current transformer comprises: the system comprises a main controller, a step current signal generator, a first filter, a first signal power amplifier, a step voltage signal generator, a second filter, a step voltage generator, a transient simulation signal generator of a direct current transmission system, a third filter, a second signal power amplifier, a transient source output device and a standard transient current transformer; the output end of the main controller is respectively connected with the input end of the step current signal generator, the input end of the step voltage signal generator and the input end of the transient simulation signal generator of the direct current transmission system; the output end of the step current signal generator is sequentially connected with the first filter and the first signal power amplifier; the output end of the step voltage signal generator is connected with the second filter and the step voltage generator in sequence; the output end of the transient simulation signal generator of the direct current transmission system is sequentially connected with the third filter and the second signal power amplifier; the first signal power amplifier, the step voltage generator and the second signal power amplifier are respectively connected with the transient source output device; the transient source output device is connected with the standard transient current transformer; the standard transient current transformer is connected with the tested direct current transformer and the transient response characteristic tester of the direct current transformer;
The transient source standard device of the direct current transformer is used for generating a step signal standard value;
the measured direct current transformer is used for generating a step signal actual value;
the transient response characteristic tester of the direct current transformer is used for obtaining a step signal standard value and a step signal actual value, wherein the step signal standard value is generated by a transient source standard device of the direct current transformer, and the step signal actual value is obtained according to a secondary signal of the direct current transformer to be tested; calculating step signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer according to the step signal standard value and the step signal actual value; acquiring a transient signal standard value and a transient signal actual value, wherein the transient signal standard value is a transient signal standard value of a direct current transformer transient source standard device for simulating a direct current transmission system under different faults, and the transient signal actual value is obtained according to a secondary signal of a tested direct current transformer; calculating transient signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer according to the transient signal standard value and the transient signal actual value; according to the step signal error and the transient signal error, evaluating transient response characteristics of the tested direct current transformer; according to the step signal standard value and the step signal actual value, calculating the step signal error of the tested direct current transformer and the transient source standard device of the direct current transformer, comprising: calculating the maximum overshoot error and the rise time error of the step response of the tested direct current transformer and the transient source standard device of the direct current transformer according to the standard value of the step signal and the actual value of the step signal; according to the step signal error and the transient signal error, evaluating transient response characteristics of the tested direct current transformer comprises the following steps: calculating the composite error of the tested direct current transformer according to a composite error calculation formula, wherein the composite error calculation formula is as follows:
Wherein Ip is the square root value of primary transient current, T is a cycle period, K is a rated transformation ratio, is a transient signal standard value, ip is a secondary signal of the tested direct current transformer, and T is a time instantaneous value; and according to the composite error, evaluating the transient response characteristic of the tested direct current transformer.
6. The system according to claim 5, further comprising a merging unit, wherein the direct current transformer transient response characteristic tester is provided with an analog quantity signal interface, a digital quantity signal interface and a synchronization interface;
the output end of the standard transient current transformer is connected with the analog quantity signal interface, and the output end of the tested direct current transformer is connected with the analog quantity signal interface;
the output end of the tested direct current transformer is also connected with the input end of the merging unit, and the output end of the merging unit is respectively connected with the digital quantity signal interface and the synchronous interface.
7. A device for testing transient response characteristics of a direct current transformer, the device comprising:
the step signal acquisition unit is used for acquiring a step signal standard value and a step signal actual value, wherein the step signal standard value is generated by a transient source standard device of the direct current transformer, and the step signal actual value is obtained according to a secondary signal of the direct current transformer to be tested;
The first calculation unit is used for calculating step signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer according to the step signal standard value and the step signal actual value;
the transient signal acquisition unit is used for acquiring a transient signal standard value and a transient signal actual value, wherein the transient signal standard value is a transient signal standard value of a direct current transformer transient source standard device simulation direct current transmission system under different faults, and the transient signal actual value is obtained according to a secondary signal of a tested direct current transformer;
the second calculation unit is used for calculating transient signal errors of the tested direct current transformer and the transient source standard device of the direct current transformer according to the transient signal standard value and the transient signal actual value;
the evaluation analysis unit is used for evaluating the transient response characteristic of the tested direct current transformer according to the step signal error and the transient signal error;
the first computing unit includes:
the maximum overshoot error and rise time error calculation module is used for calculating the step response maximum overshoot error and rise time error of the tested direct current transformer and the direct current transformer transient source standard device according to the step signal standard value and the step signal actual value;
The evaluation analysis unit includes:
the composite error calculation module is used for calculating the composite error of the tested direct current transformer according to a composite error calculation formula, and the composite error calculation formula is as follows:
wherein Ip is the square root value of primary transient current, T is a cycle period, K is a rated transformation ratio, is a transient signal standard value, ip is a secondary signal of the tested direct current transformer, and T is a time instantaneous value;
and the composite evaluation module is used for evaluating the transient response characteristic of the tested direct current transformer according to the composite error.
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