CN113866704A - Transient characteristic test method and device for direct current voltage transformer of grounding electrode line - Google Patents
Transient characteristic test method and device for direct current voltage transformer of grounding electrode line Download PDFInfo
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Abstract
The application provides a transient characteristic test method and device for a direct current voltage transformer of a grounding electrode line, and the transient characteristic of the direct current voltage transformer to be tested is obtained through a ratio error, a phase error, a step rise time and a step response time characteristic vector. The step response low value and the step response high value of the step response signal are obtained by sampling the step response signal low value interval and the step response signal high value interval and averaging the sampled data, and the step rise time and the step response time characteristic vector of the step response signal are obtained by the step response low value and the step response high value of the step response signal to characterize the transient characteristics of the tested direct current voltage transformer, so that the data processing process is simplified, the error is reduced, and the efficiency is improved.
Description
Technical Field
The application relates to the technical field of power equipment detection, in particular to a transient characteristic test method and device for a direct current voltage transformer of an earth electrode circuit.
Background
A ground electrode is an array of conductive elements placed in the earth, providing a low resistance path between a direct current circuit and earth. The grounding electrode line is an insulated line for connecting a direct current neutral bus of the converter station with a grounding electrode, and is an important component of a high-voltage direct current transmission system. Meanwhile, the direct current voltage transformer is an instrument for converting voltage similar to a transformer and is mainly used for line protection and electric energy measurement. In the grounding electrode circuit laid by the double loops, two independent direct current voltage transformers are installed in the converter station to measure current, so that fault detection and protection of the grounding electrode circuit are realized.
When the double poles are in unbalanced operation, unbalanced current of several amperes to dozens of amperes usually flows in a grounding pole line, and a direct current voltage transformer can sense harmonic components brought by the converter. Meanwhile, when the grounding electrode circuit breaks down, large current flows into the ground, great threat is caused to people and livestock nearby and safety production, and the direct current voltage transformer can sense abundant harmonic components and can also flow in fault transient current of hundreds of amperes. Therefore, high requirements are put forward on the broadband measurement performance, especially the transient characteristic, of the direct current voltage transformer. In the test of the transient characteristic of the direct current voltage transformer, because a transient response signal curve is not completely smooth, noise interference exists, an error exists in a signal sampling result, and the processing efficiency of abnormal points and catastrophe points in sampling data is low.
Disclosure of Invention
The application provides a method and a device for testing transient characteristics of a direct current voltage transformer of an earth electrode circuit, which aim to solve the problem of low quality and efficiency of transient characteristic tests of the traditional direct current voltage transformer.
On the one hand, the application provides a method for testing transient characteristics of a direct-current voltage transformer of a grounding electrode circuit, comprising the following steps of:
obtaining harmonic voltage signals, wherein the harmonic voltage signals are sent to a transient voltage signal source device by a transient voltage source configuration device, and the transient voltage signal source device controls a harmonic voltage source to generate according to the harmonic configuration command;
simultaneously applying the harmonic voltage signal to a resistance voltage division broadband standard device and a tested direct current voltage transformer to obtain a standard secondary voltage signal and a tested secondary voltage signal;
calculating to obtain a ratio error and a phase error according to the standard secondary voltage signal and the measured secondary voltage signal;
acquiring a step voltage signal, wherein the step voltage signal is transmitted to a transient voltage signal source device by a transient voltage source configuration device, and the transient voltage signal source device controls an adjustable step and transient fault voltage source to generate according to the step configuration instruction;
simultaneously applying the step voltage signal to a resistance voltage division broadband standard and a tested direct current voltage transformer to obtain a standard step response signal and a tested step response signal;
respectively sampling the standard step response signal and the measured step response signal and averaging sampled data to obtain a step response low value and a step response high value of the standard step response signal and a step response low value and a step response high value of the measured step response signal;
calculating according to the step response low value and the step response high value of the standard step response signal and the step response low value and the step response high value of the detected step response signal respectively to obtain the step rise time characteristic vector of the standard step response signal, the step rise time characteristic vector of the detected step response signal and the step rise time of the detected step response signal;
subtracting the step rising time characteristic vector of the standard step response signal from the step rising time characteristic vector of the measured step response signal to obtain a step response time characteristic vector;
and analyzing the ratio error, the phase error, the step rise time of the measured step response signal and the characteristic vector of the step response time to obtain the transient characteristic of the measured direct current voltage transformer.
In one implementation, the ratio error is calculated by:
wherein f isnIs the ratio error; u shape1nThe voltage square root mean value of the nth harmonic component of the primary voltage signal of the tested direct current voltage transformer is obtained; u shape2nFor the measured secondary voltage signalVoltage square root mean of nth harmonic component; when n is 1, it represents the fundamental component; and the voltage square root mean value of the nth harmonic component of the primary voltage signal of the tested direct current voltage transformer is obtained by calculating the transformation ratio of the standard secondary voltage signal.
In one implementation, the phase error is calculated by:
δn＝δ2n-δ1n；
wherein, deltanIs the phase error; delta1nThe phase of the nth harmonic component of the primary voltage signal of the tested direct current voltage transformer is obtained; delta2nThe phase of the nth harmonic component of the measured secondary voltage signal is obtained; when n is 1, it represents the fundamental component; and the phase of the nth harmonic component of the primary voltage signal of the tested direct current voltage transformer is obtained by calculating the transformation ratio of the standard secondary voltage signal.
In one implementation, sampling and averaging the step response signal to obtain a low value and a high value of the step response signal includes:
respectively sampling a low value interval and a high value interval of the step response signal to acquire sampling data;
respectively averaging the sampling data in the low value interval and the high value interval of the step response signal to obtain a low value and a high value of the step response signal;
and if the step response low value or the step response high value exceeds the step response signal low value interval or the step response signal high value interval, judging that abnormal points exist in the sampling data, and recalculating the average value of the sampling data after the abnormal points are eliminated.
In one implementation, a step-rise-time feature vector T ═ T of the step response signal is obtained10％,t11％,t12％,...,t99％,t100％]And a step rise time t100％-t10％。
Wherein, t10％To t99％For the step response signal valueThe interval is 1% at the corresponding time when the jump response low value is increased by 10% to 99%; t is t100％The time when the value of the step response signal first reaches the high value of the step response.
On the other hand, the application provides a test device for transient characteristics of a direct current voltage transformer of an earth electrode circuit, which is used for realizing the test method for the transient characteristics of the direct current voltage transformer of the earth electrode circuit, and comprises the following steps:
a transient voltage source configuration device configured to send configuration instructions to a transient voltage signal source device, the configuration instructions including harmonic configuration instructions and step configuration instructions;
a transient voltage signal source device configured to control a harmonic voltage source configured to provide a harmonic voltage signal and an adjustable step and transient fault voltage source configured to provide a step voltage signal according to the configuration command;
the resistor voltage division broadband standard device is configured to output standard signals, and the standard signals comprise standard secondary voltage signals and standard step response signals;
the direct current voltage transformer to be tested is configured to output a signal to be tested, and the signal to be tested comprises a secondary voltage signal to be tested and a step response signal to be tested;
a transient test device configured to calculate transient characteristics of the signal under test, the transient characteristics including a ratio error, a phase error, a step rise time, and a step response time feature vector.
According to the transient characteristic test method and device for the direct current voltage transformer of the grounding electrode line, the transient characteristic of the direct current voltage transformer to be tested is obtained through the ratio error, the phase error, the step rise time and the step response time characteristic vector. The step response low value and the step response high value of the step response signal are obtained by sampling the step response signal low value interval and the step response signal high value interval and averaging the sampled data, and the step rise time and the step response time characteristic vector of the step response signal are obtained by the step response low value and the step response high value of the step response signal to characterize the transient characteristics of the tested direct current voltage transformer, so that the data processing process is simplified, the error is reduced, and the efficiency is improved.
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In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for testing transient characteristics of a direct current voltage transformer of a grounding electrode line according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a method for acquiring a low value and a high value of a step response signal according to an embodiment of the present application;
fig. 3 is a schematic diagram of a step response signal and a locally amplified step-low value signal and a step-high value signal provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a transient characteristic testing apparatus for a direct current voltage transformer of an earth electrode line according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.
Referring to fig. 1, a schematic flow chart of a method for testing transient characteristics of a direct current voltage transformer of a grounding electrode line provided in an embodiment of the present application is shown. As can be seen from fig. 1, the transient characteristic experiment method for the direct current voltage transformer of the grounding electrode line provided by the present application includes:
s1: and acquiring a harmonic voltage signal.
In this embodiment, the static voltage source configuration device 1 sends a harmonic configuration instruction of the harmonic voltage signal to the transient voltage signal source device 2, the transient voltage signal source device 2 controls the harmonic voltage source 21 according to the harmonic configuration instruction, and the harmonic voltage source 21 generates the harmonic voltage signal.
S2: and simultaneously applying the harmonic voltage signal to the resistance voltage division broadband standard 3 and the tested direct current voltage transformer 4 to obtain a standard secondary voltage signal and a tested secondary voltage signal.
In this embodiment, the harmonic voltage signal generated by the harmonic voltage source 21 is applied to the resistor-divided wideband standard 3 and the dc voltage transformer 4 to be tested at the same time, the resistor-divided wideband standard 3 generates a standard secondary voltage signal, and the dc voltage transformer 4 to be tested generates a secondary voltage signal to be tested. The resistance voltage division broadband standard device 3 converts the standard secondary voltage signal from analog quantity to digital quantity through an analog-to-digital conversion module, and sends the standard secondary voltage signal to the transient test device 5 through a wireless sending module. The tested direct current voltage transformer 4 transmits the tested secondary voltage signal to the transient test device 5 through an optical fiber.
S3: and calculating according to the standard secondary voltage signal and the measured secondary voltage signal to obtain a ratio error and a phase error.
In this embodiment, the transient test device 5 completes the calculation of the ratio error and the phase error according to the received data. Wherein, the ratio error of the measured fundamental voltage or nth harmonic component of the measured direct current voltage transformer 4 is defined as fnThe calculation formula is as follows:
wherein, U1nThe voltage square root mean value of the nth harmonic component of the primary voltage signal of the tested direct current voltage transformer is obtained; u shape2nThe voltage square root mean value of the nth harmonic component of the measured secondary voltage signal is obtained; when n is 1, it represents the fundamental component; and the voltage square root mean value of the nth harmonic component of the primary voltage signal of the tested direct current voltage transformer is obtained by calculating the transformation ratio of the standard secondary voltage signal.
Definition of DC voltage transformer to be tested4 measuring the phase error of the fundamental voltage or the nth harmonic component as deltanThe calculation formula is as follows:
δn＝δ2n-δ1n；
wherein, delta1nThe phase of the nth harmonic component of the primary voltage signal of the tested direct current voltage transformer is obtained; delta2nThe phase of the nth harmonic component of the measured secondary voltage signal is obtained; when n is 1, it represents the fundamental component; and the phase of the nth harmonic component of the primary voltage signal of the tested direct current voltage transformer is obtained by calculating the transformation ratio of the standard secondary voltage signal. The direction of the phase error of the measured direct current voltage transformer is determined by that the phase difference of an ideal measured direct current voltage transformer is zero, when the phase of the measured secondary voltage signal leads the phase of the primary voltage signal of the measured direct current voltage transformer, the phase difference is positive, and otherwise, the phase difference is negative.
The transient response refers to the process of changing the output quantity of the system from the initial state to the steady state under the action of a typical signal input, and the transient response of the direct current voltage measuring device is actually the response of the secondary voltage to the transient change of the primary voltage. The response time is the time required from the start of the measurement until the response reaches and maintains its final stable value within a specified error or the corresponding output of the step input rises to a specified percentage of its final value.
The step response process of the dc voltage measuring device is a continuous process from a time when a predetermined step signal is applied to the primary side of the dc voltage measuring device until the output of the dc voltage measuring device reaches a predetermined limit value and maintains a steady-state value thereof. The transient response of a dc voltage measuring device is typically tested by a step response. A step voltage signal having a measurement range of 10% or more is applied to the primary side of a DC voltage measuring device, and an output voltage curve is measured on the secondary side. The percentage of the measurement range is the percentage of the input signal voltage of the dc voltage measuring device in practical application, for example, when the actual input signal voltage of the dc voltage measuring device is 300kV, the voltage of the step voltage signal applied to the dc voltage measuring device with the measurement range of 10% or more is 30kV or more.
S4: and acquiring a step voltage signal.
In this embodiment, the static voltage source configuration device 1 sends the step configuration instruction of the step voltage signal to the transient voltage signal source device 2, the transient voltage signal source device 2 controls the adjustable step and transient fault voltage source 22 according to the step configuration instruction, and the adjustable step and transient fault voltage source 22 generates the step voltage signal.
S5: and simultaneously applying the step voltage signal to the resistance voltage division broadband standard 3 and the tested direct current voltage transformer 4 to obtain a standard step response signal and a tested step response signal.
In this embodiment, the step voltage signal generated by the adjustable step and transient fault voltage source 22 is applied to the resistor divider broadband etalon 3 and the measured dc voltage transformer 4 at the same time, the resistor divider broadband etalon 3 generates a standard step response signal, and the measured dc voltage transformer 4 generates a measured step response signal. The resistance voltage division broadband standard 3 converts the standard step response signal from analog quantity to digital quantity through an analog-to-digital conversion module, and sends the standard step response signal to the transient test device 5 through a wireless sending module. The tested direct current voltage transformer 4 transmits the tested step response signal to the transient test device 5 through the optical fiber.
S6: and respectively sampling the standard step response signal and the measured step response signal, averaging the sampled data, and acquiring a step response low value and a step response high value of the standard step response signal and a step response low value and a step response high value of the measured step response signal.
For the direct current voltage transformer with analog quantity output, the standard signal and the measured signal can adopt the mode of the same sampling rate to collect data, and the sampled data is easier to process and analyze. However, for a dc voltage transformer with digital output, the sampling rate of the standard signal is different from that of the measured signal, which makes it difficult to process the step response calculation. For example, the sampling rate of the measured signal output by the DC voltage transformer is usually 10kHz-100kHz, while the sampling rate of the standard signal output by the standard instrument is 200kHz or 500kHz, so that the sampling rate of the standard signal acquisition is not matched with that of the measured signal acquisition. In the step response, the requirement on the calculation precision is not high, and the calculation mode can be simplified in order to improve the calculation efficiency in engineering application.
S601: and respectively sampling the low value interval and the high value interval of the step response signal to acquire sampling data.
Referring to fig. 2 and fig. 3, a step response signal time window is selected in a step response signal low value interval and a step response signal high value interval respectively, and the time window signal is sampled, wherein the step response low value is set as D1, the number of sampling points is n1, the step response high value is set as G1, and the number of sampling points is n 2.
S602: and respectively averaging the sampling data in the low value interval and the high value interval of the step response signal.
The low value D1 and the high value G1 of the step response are obtained by averaging part of the sampled data, and in order to avoid selecting abnormal points as much as possible, the sampling data used for averaging are selected according to the following principle: the time window is selected from the center to the left and the right, and the selected length is 10% -20% of the time window. Taking the low-value interval of the step response signal as an example, the sampling points are selected from [ N1/2-N1, N1/2+ N1], wherein N1 is 5% -10% of the sampling data of the low-value interval of the step response signal. And respectively averaging partial sampling data selected in the low value interval and the high value interval of the step response signal.
S603: and if the average value of the sampled data in the low value interval or the high value interval of the step response signal exceeds the low value interval or the high value interval of the step response signal, judging that abnormal points exist in the sampled data, and recalculating the average value of the sampled data after the abnormal points are eliminated.
S604: and if the average value of the sampled data in the low value interval or the high value interval of the step response signal does not exceed the low value interval or the high value interval of the step response signal, judging that no abnormal point exists in the sampled data, and respectively setting the average values calculated in the step 602 as a low value D1 of the step response and a high value G1 of the step response.
S7: and acquiring a step rising time characteristic vector of the standard step response signal, a step rising time characteristic vector of the detected step response signal and the step rising time of the detected step response signal.
According to the method for calculating the step response low value D1 and the step response high value G1 of S6, the standard step response low value D1 of the standard step response signal is obtainedbzAnd a standard step response high value G1bzA measured step response low value D1 of the measured step response signalbcAnd a measured step response high value G1bc。
Taking the step rise time characteristic vector of the standard step response signal as an example, the standard step response high value G1 is obtainedbzAnd standard step response low value D1bzSubtracting to obtain the standard step response low value D1bzThe corresponding standard step response signal value is obtained when the standard step response signal value is increased by 10 percent, and the corresponding time t is obtained according to the corresponding standard step response signal valuebz10％And so on, calculating the standard step response low value D1bzIncrease 11%, 12% and until the corresponding time t of 99%bz11％、tbz12％、...、tbz99％The interval is 1%. Then calculating that the standard step response signal reaches the high value G1 of the standard step response for the first timebzIs denoted as tbz100％And obtaining a step rise time characteristic vector of the standard step response signal:
Tbz＝[tbz10％，tbz1％，tbz12％，...，tbz99％，tbz100％]；
obtaining a step rise time characteristic vector of the detected step response signal according to the method:
Tbc＝[tbc10％，tbc11％，tbc12％，...，tbc99％，tbc100％]；
wherein, the step rise time of the detected step response signal is as follows: t is tbc100％-tbc10％。
S8: and subtracting the step rising time characteristic vector of the standard step response signal from the step rising time characteristic vector of the measured step response signal to obtain the step response time characteristic vector.
Step rising time characteristic vector T of standard step response signal obtained in S7bzAnd the step rise time characteristic vector T of the measured step response signalbcSubtracting to obtain a step response time feature vector:
Txy＝[tbc10％-tbz10％，tbc11％-tbz11％，tbc12％-tbz12％，...，tbc100％-tbz100％]；
s9: and analyzing the ratio error, the phase error, the step rise time of the detected step response signal and the characteristic vector of the step response time to obtain the transient characteristic of the detected direct current voltage transformer.
And analyzing whether the ratio error, the phase error, the step rise time of the detected step response signal and the step response time feature vector obtained in the methods S1-S8 in the embodiment meet the standard or not. The reference value of the ratio error of the measured harmonic voltage signal is 3%, the reference value of the phase error is 540' (500 mu s), and the ratio error and the phase error meet the engineering application standard when being smaller than the reference values. The step rise time criterion of the measured step response signal is less than 250 mus. The requirement on the step response time has no very clear standard, so the step response time is represented by using the step response time characteristic vector, whether the maximum value in the step response time vector meets the engineering standard or not is judged, and if the maximum value meets the standard, the transient characteristic of the tested direct current voltage transformer is proved to be good. The engineering standards in different application environments are different, and analysis is needed according to specific situations in practical application.
Referring to fig. 4, the present embodiment further provides a transient characteristic testing apparatus for a direct current voltage transformer on a ground line, which is used to implement the transient characteristic testing method, where the transient characteristic testing apparatus includes a transient voltage source configuration apparatus 1, a transient voltage signal source apparatus 2, a harmonic voltage source 21, an adjustable step and transient fault voltage source 22, a resistor-divided broadband standard 3, a direct current voltage transformer 4 to be tested, and a transient testing apparatus 5.
The transient voltage source configuration device 1 is configured to send a configuration instruction to the transient voltage signal source device 2. The transient voltage signal source device 2 controls the harmonic voltage source 21 and the adjustable step and transient fault voltage source 22 according to the configuration command, generates a harmonic voltage signal or a step voltage signal, and simultaneously sends the generated harmonic voltage signal or the step voltage signal to the resistance voltage division broadband standard 3 and the tested direct current voltage transformer 4. The resistance voltage division broadband standard 3 outputs standard signals, the standard signals comprise standard secondary voltage signals and standard step response signals, and the resistance voltage division broadband standard 3 sends the output standard signals to the transient test device 5 in a wireless mode after analog-to-digital conversion. The tested direct current voltage transformer 4 outputs a tested signal, the tested signal comprises a tested secondary voltage signal and a tested step response signal, and the tested signal output by the tested direct current voltage transformer 4 is transmitted to the transient testing device 5 through an optical fiber. The transient test device 5 is configured to calculate transient characteristics of the signal under test, including a ratio error, a phase error, a step rise time, and a step response time feature vector.
The embodiment provides a transient characteristic test method and device for a direct current voltage transformer of an earth electrode line, and the transient characteristic of the direct current voltage transformer to be tested is obtained through a ratio error, a phase error, a step rise time and a step response time characteristic vector. The step response low value and the step response high value of the step response signal are obtained by sampling the step response signal low value interval and the step response signal high value interval and averaging the sampled data, and the step rise time and the step response time characteristic vector of the step response signal are obtained by the step response low value and the step response high value of the step response signal to characterize the transient characteristics of the tested direct current voltage transformer, so that the data processing process is simplified, the error is reduced, and the efficiency is improved.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (6)
1. A transient characteristic test method for a direct current voltage transformer of an earth electrode line is characterized by comprising the following steps:
obtaining harmonic voltage signals, wherein the harmonic voltage signals are sent to a transient voltage signal source device (2) by a transient voltage source configuration device (1), and the transient voltage signal source device (2) controls a harmonic voltage source (21) to generate according to the harmonic configuration instruction;
simultaneously applying the harmonic voltage signal to a resistance voltage division broadband standard (3) and a tested direct current voltage transformer (4) to obtain a standard secondary voltage signal and a tested secondary voltage signal;
calculating to obtain a ratio error and a phase error according to the standard secondary voltage signal and the measured secondary voltage signal;
acquiring a step voltage signal, wherein the step voltage signal is sent to a transient voltage signal source device (2) by a transient voltage source configuration device (1), and the transient voltage signal source device (2) controls an adjustable step and transient fault voltage source (22) to generate according to the step configuration instruction;
simultaneously applying the step voltage signal to a resistance voltage division broadband standard (3) and a tested direct current voltage transformer (4) to obtain a standard step response signal and a tested step response signal;
respectively sampling the standard step response signal and the measured step response signal and averaging sampled data to obtain a step response low value and a step response high value of the standard step response signal and a step response low value and a step response high value of the measured step response signal;
calculating according to the step response low value and the step response high value of the standard step response signal and the step response low value and the step response high value of the detected step response signal respectively to obtain the step rise time characteristic vector of the standard step response signal, the step rise time characteristic vector of the detected step response signal and the step rise time of the detected step response signal;
subtracting the step rising time characteristic vector of the standard step response signal from the step rising time characteristic vector of the measured step response signal to obtain a step response time characteristic vector;
and analyzing the ratio error, the phase error, the step rise time of the detected step response signal and the step response time characteristic vector to acquire the transient characteristic of the detected direct current voltage transformer (4).
2. The grounding electrode line direct current voltage transformer transient characteristic test method according to claim 1, wherein the ratio error is calculated by the following method:
wherein f isnIs the ratio error; u shape1nThe voltage square root mean value of the nth harmonic component of the primary voltage signal of the tested direct current voltage transformer is obtained; u shape2nThe voltage square root mean value of the nth harmonic component of the measured secondary voltage signal is obtained; when n is 1, it represents the fundamental component; and the voltage square root mean value of the nth harmonic component of the primary voltage signal of the tested direct current voltage transformer is obtained by calculating the transformation ratio of the standard secondary voltage signal.
3. The grounding electrode line direct current voltage transformer transient characteristic test method according to claim 2, wherein the phase error is calculated by the following method:
δn＝δ2n-δ1n；
wherein, deltanIs the phase error; delta1nThe phase of the nth harmonic component of the primary voltage signal of the tested direct current voltage transformer is obtained; delta2nThe phase of the nth harmonic component of the measured secondary voltage signal is obtained; when n is 1, it represents the fundamental component; the nth harmonic component of the primary voltage signal of the DC voltage transformer to be testedIs calculated from the standard secondary voltage signal transformation ratio.
4. The grounding electrode line direct current voltage transformer transient characteristic test method of claim 1, wherein sampling and averaging step response signals to obtain a step response low value and a step response high value of the step response signals comprises:
respectively sampling a low value interval and a high value interval of the step response signal to acquire sampling data;
respectively averaging the sampling data in the low value interval and the high value interval of the step response signal to obtain a low value and a high value of the step response signal;
and if the step response low value or the step response high value exceeds the step response signal low value interval or the step response signal high value interval, judging that abnormal points exist in the sampling data, and recalculating the average value of the sampling data after the abnormal points are eliminated.
5. The grounding electrode line direct current voltage transformer transient characteristic test method according to claim 4, characterized by comprising: acquiring a step rise time characteristic vector T ═ T of the step response signal10％，t11％，t12％，...，t99％，t100％]And a step rise time t100％-t10％；
Wherein, t10％To t99％The interval is 1% at the corresponding time when the step response signal value is increased from the low value of the step response by 10% to 99%; t is t10％The time when the value of the step response signal first reaches the high value of the step response.
6. An earthing electrode line direct current voltage transformer transient characteristic test device, which is used for realizing the earthing electrode line direct current voltage transformer transient characteristic test method of any one of claims 1-5, and is characterized by comprising the following steps:
a transient voltage source configuration device (1) configured to send a configuration instruction to a transient voltage signal source device (2); the configuration instructions comprise harmonic configuration instructions and step configuration instructions;
a transient voltage signal source device (2) configured to control a harmonic voltage source (21) and an adjustable step and transient fault voltage source (22) according to the configuration instructions; the harmonic voltage source (21) is configured to provide a harmonic voltage signal; the adjustable step and transient fault voltage source (22) is configured to provide a step voltage signal;
a resistor-divided broadband etalon (3) configured to output a standard signal; the standard signal comprises a standard secondary voltage signal and a standard step response signal;
a measured direct current voltage transformer (4) configured to output a measured signal; the measured signal comprises a measured secondary voltage signal and a measured step response signal;
a transient test device (5) configured to calculate a transient characteristic of the signal under test; the transient characteristics include ratio error, phase error, step rise time, and step response time eigenvector.
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| CN202111155604.XA CN113866704B (en) | 2021-09-30 | Transient characteristic test method and device for direct-current voltage transformer of grounding electrode line |
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