CN106932746B - Electronic current transformer performance test system and method - Google Patents
Electronic current transformer performance test system and method Download PDFInfo
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Abstract
The invention discloses a system and a method for testing the performance of an electronic current transformer, wherein the system comprises a standard current transformer and a test electronic current transformer which are connected in series on the primary side, and further comprises a sampling rate self-adaptive module and a merging unit module; the input end of the sampling rate self-adaptive module is connected with the output end of the test electronic current transformer, and the input end of the merging unit module is respectively connected with the output ends of the standard current transformer and the sampling rate self-adaptive module. The invention completes the delay test of the hybrid sampling differential circuit by simultaneously connecting the electromagnetic current transformer of the hybrid sampling differential protection and the sampling circuit of the electronic current transformer, and taking the electromagnetic current transformer as a reference, and is used for delay compensation in UPFC protection.
Description
Technical Field
The invention belongs to the technical field of flexible direct current transmission, and particularly relates to a system and a method for testing the performance of an electronic current transformer.
Background
The direct-current electronic transformer is important equipment for measuring the voltage of the flexible direct-current transmission system, and the measurement performance of the direct-current electronic transformer is related to the safe and stable operation of the flexible direct-current transmission system. The good field test equipment is beneficial to improving the test efficiency of the direct current voltage transformer and ensuring the safe and stable operation of the flexible direct current transmission system.
In the current field test, the test method is mainly a one-time through-flow test, currents with different sizes are introduced into the primary side to test the precision and the time delay characteristics of the direct current electronic transformer, multiple wiring and repeated measurement are needed for the precision and time delay characteristic test, the workload is increased, and very high requirements are provided for field management.
Disclosure of Invention
Aiming at the problems, the invention provides a system and a method for testing the performance of an electronic current transformer, which are used for connecting accuracy verification and delay measurement into the same loop, gradually increasing the primary side current, reducing repeated wiring, facilitating field management and improving the testing efficiency.
The technical purpose is achieved, the technical effect is achieved, and the invention is realized through the following technical scheme:
a performance test system for an electronic current transformer comprises a standard current transformer and a test electronic current transformer which are connected in series on a primary side, and further comprises a sampling rate self-adaptive module and a merging unit module;
the standard current transformer and the test electronic current transformer are provided with synchronous signal access ports for accessing synchronous signals;
the input end of the sampling rate self-adaptive module is connected with the output end of the test electronic current transformer, and the input end of the merging unit module is respectively connected with the output ends of the standard current transformer and the sampling rate self-adaptive module;
the sampling rate self-adaptive module receives a sampling value message output by the electronic current transformer to be tested and judges the sampling rate of the electronic current transformer to be tested; then, the data are transmitted to a merging unit module together with the sampling rate and the sampling value message;
the standard current transformer outputs a sampling value message to the merging unit module;
and the merging unit module compares the sampling value message output by the test electronic current transformer with the sampling value message output by the standard current transformer according to the received sampling rate, calculates the relative error of the test electronic transformer relative to the standard value by taking the measured value of the standard current transformer as the standard value, and verifies the precision of the test electronic current transformer.
Furthermore, the electronic current transformer performance test system further comprises an electromagnetic current transformer and a delay compensation module;
the primary side of the electromagnetic current transformer is connected with the primary side of the electronic current transformer to be tested in series; the output ends of the electromagnetic current transformer and the test electronic current transformer are respectively connected with the input end of the delay compensation module;
the electromagnetic current transformer is provided with a synchronous signal access port for accessing a synchronous signal;
the time delay compensation module compares the received time of the sampling value message output by the electronic testing current transformer with the time of the real-time analog quantity output by the electromagnetic current transformer, the sampling time delay of the sampling value message of the electronic testing current transformer relative to the analog quantity output by the electromagnetic current transformer is delta t, the sampling time delay is delta t and serves as time delay compensation of use, and when data measured by the electronic testing current transformer are used, the timestamp of the data needs to be compensated for delta t forwards.
Further, the standard current transformer, the test electronic current transformer and the electromagnetic current transformer are used for measuring the voltage on a non-inductive resistor arranged in the standard current transformer, the test electronic current transformer and the electromagnetic current transformer to obtain a measured current value.
Further, the sampling rate self-adaptive module is a sampling rate judgment module, and is used for judging the actual sampling rate of the electronic current transformer to be tested.
Further, the specific judgment process of the sampling rate self-adaptive module for judging and testing the actual sampling rate of the electronic current transformer is as follows:
timing is started at the moment of receiving data for the first time after self-testing is started;
if the data is received at the point of 20us, the sampling rate is judged to be 50kHz, and the sampling rate judgment process is ended;
if the data is not received at the 20us point, judging again at the 40us point, if the data is received, indicating that frame loss occurs at the previous time, judging that the sampling rate is 50kHz, and ending the sampling rate judging process;
if the data is not received at the 40us point, the sampling rate is determined to be 10kHz, and the sampling rate determination process is ended.
A performance test method for an electronic current transformer comprises the following steps:
inputting synchronous signals to a standard current transformer and a test electronic current transformer;
the electronic current transformer is tested to output a sampling value message to the sampling rate self-adaptive module, and the sampling rate self-adaptive module judges the sampling rate and sends the sampling rate and the received sampling value message to the merging unit module; meanwhile, the standard current transformer outputs a sampling value message to the merging unit module;
and the merging unit module compares the sampling value message output by the electronic current transformer to be tested with the sampling value message output by the standard current transformer according to the received sampling rate, and verifies the precision of the electronic current transformer to be tested by taking the measured value of the standard current transformer as a standard value.
Further, the performance test method for the electronic current transformer further comprises the following steps: inputting synchronous signals to the electronic current transformer and the electromagnetic current transformer to be tested;
the electromagnetic current transformer outputs analog quantity to the delay compensation module, and the electronic current transformer is tested to output sampling value messages to the delay compensation module;
the time delay compensation module compares the received time of the sampling value message output by the electronic testing current transformer with the time of the real-time analog quantity output by the electromagnetic current transformer, the sampling time delay of the sampling value message of the electronic testing current transformer relative to the analog quantity output by the electromagnetic current transformer is delta t, the sampling time delay is delta t and serves as time delay compensation of use, and when data measured by the electronic testing current transformer are used, the timestamp of the data needs to be compensated for delta t forwards.
Further, the performance test method of the electronic current transformer further comprises the following steps: and changing the current introduced to the primary side, and recording the precision of the electronic current transformer to be tested and the sampling delay delta t of the electronic current transformer to be tested at a set ratio point.
Furthermore, the synchronous signal input to the standard current transformer and the test electronic current transformer and the synchronous signal input to the electromagnetic current transformer are generated by the same signal generator.
Further, the specific judgment process of the sampling rate self-adaptive module for judging and testing the actual sampling rate of the electronic current transformer is as follows:
timing is started at the moment of receiving data for the first time after self-testing is started;
if the data is received at the point of 20us, the sampling rate is judged to be 50kHz, and the sampling rate judgment process is ended;
if the data is not received at the 20us point, judging again at the 40us point, if the data is received, indicating that frame loss occurs at the previous time, judging that the sampling rate is 50kHz, and ending the sampling rate judging process;
if the data is not received at the 40us point, the sampling rate is determined to be 10kHz, and the sampling rate determination process is ended.
The invention has the beneficial effects that:
according to the invention, the arrival time of a sampling value message of an electronic current transformer is measured and tested through a sampling rate self-adaptive module, the data input of sampling rates of 10kHz and 50kHz is self-adaptive, and a merging unit module completes the analysis of the sampling value message according to the sampling rate; when the method is applied to a UPFC system, a current transformer of the UPFC system is combined with a one-time through-flow test on site, a standard current transformer is used as a reference, high-precision analog quantity acquisition is carried out, I/V precision conversion is realized by measuring the voltage on a non-inductive resistor with high precision and low temperature coefficient, the primary side is gradually increased from 0 to a rated value, the relative error of the UPFC alternating current and direct current electronic transformer is calculated at different ratio points, and the accuracy verification is realized; the hybrid sampling differential circuit delay test is completed by simultaneously accessing the electromagnetic current transformer for hybrid sampling and testing the sampling loop of the electronic current transformer, taking the electromagnetic current transformer as a reference, and is used for delay compensation in UPFC protection.
According to the invention, accuracy verification and delay measurement are connected to the same loop, and primary side current is gradually increased, so that repeated wiring is reduced, field management is facilitated, and test efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a primary loop of shunt resistance type OCT;
FIG. 2 is a schematic diagram of a primary loop of a current transformer and shunt resistance type OCT;
FIG. 3 is a schematic diagram of a primary loop of Rogowski coil and shunt resistance type OCT;
FIG. 4 is a schematic diagram of a performance testing system for an electronic current transformer;
fig. 5 is a flow chart of the determination process of the sample rate adaptation module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
Fig. 1 to 3 are schematic diagrams of primary circuits of a shunt resistance type OCT, a current transformer and shunt resistance type OCT, a rogowski coil and shunt resistance type OCT in the related art, respectively. The sampled data is output through an optical fiber conversion loop or an OIB remote end module; the sampling delay of electronic transformers with different principles is different, and delay compensation is needed in protection application.
Example one
As shown in fig. 4, a performance testing system for an electronic current transformer includes a standard current transformer and a testing electronic current transformer connected in series on a primary side, and further includes a sampling rate adaptive module and a merging unit module;
the standard current transformer and the test electronic current transformer are provided with synchronous signal access ports for accessing synchronous signals;
the input end of the sampling rate self-adaptive module is connected with the output end of the test electronic current transformer, and the input end of the merging unit module is respectively connected with the output ends of the standard current transformer and the sampling rate self-adaptive module;
the sampling rate self-adaptive module receives a sampling value message output by the electronic current transformer to be tested and judges the sampling rate of the electronic current transformer to be tested; then, the data are transmitted to a merging unit module together with the sampling rate and the sampling value message;
the standard current transformer outputs a sampling value message to the merging unit module;
and the merging unit module compares the sampling value message output by the electronic current transformer to be tested with the sampling value message output by the standard current transformer according to the received sampling rate, and calculates the relative error of the sampling value of the electronic current transformer to be tested by taking the measured value of the standard current transformer as a standard value, thereby realizing the verification of the precision of the electronic current transformer.
Preferably, the standard current transformer, the test electronic current transformer and the electromagnetic current transformer are used for measuring the voltage on a non-inductive resistor arranged in the standard current transformer, the test electronic current transformer and the electromagnetic current transformer to obtain a measured current value.
The sampling rate self-adaptive module is a sampling rate judging module and is used for judging and testing the actual sampling rate of the electronic current transformer.
At present, according to the national standard, the sampling rate adopted by the electronic transformer is 10kHz or 50kHz, and therefore, as shown in fig. 5, the specific determination process of the sampling rate adaptive module in this embodiment for determining and testing the actual sampling rate of the electronic current transformer is as follows:
starting timing after receiving the data of the first point;
timing is started at the moment of receiving data for the first time after self-testing is started;
if the data is received at the point of 20us, the sampling rate is judged to be 50kHz, and the sampling rate judgment process is ended;
if the data is not received at the 20us point, judging again at the 40us point, if the data is received, indicating that frame loss occurs at the previous time, judging that the sampling rate is 50kHz, and ending the sampling rate judging process;
if the data is not received at the 40us point, the sampling rate is determined to be 10kHz, and the sampling rate determination process is ended.
According to the scheme of the embodiment, the arrival time of the sampling value message of the electronic current transformer is measured and tested through the sampling rate self-adaptive module, the data input of the sampling rates of 10kHz and 50kHz is self-adaptive, and the merging unit module completes the analysis of the sampling value message according to the sampling rate; when the invention is applied to a UPFC system, a current transformer of the UPFC system is combined with a field one-time through-flow test, a standard current transformer is used as a reference, high-precision analog quantity acquisition is carried out, I/V precision conversion is realized by measuring the voltage on a non-inductive resistor with high precision and low temperature coefficient, the primary side is gradually increased from 0 to a rated value, the relative error of the UPFC alternating current and direct current electronic transformer is calculated at different ratio points, and the accuracy verification is realized.
Example two
The difference between this embodiment and the first embodiment is:
as shown in fig. 4, the electronic current transformer performance testing system further includes an electromagnetic current transformer and a delay compensation module;
the primary side of the electromagnetic current transformer is connected with the primary side of the electronic current transformer to be tested in series; the output ends of the electromagnetic current transformer and the test electronic current transformer are respectively connected with the input end of the delay compensation module;
the electromagnetic current transformer is provided with a synchronous signal access port for accessing a synchronous signal;
the time delay compensation module compares the received time of the sampling value message output by the electronic current transformer to the time of the real-time analog quantity output by the electromagnetic current transformer, tests the sampling delay quantity delta t of the electronic current transformer message relative to the analog quantity output by the electromagnetic current transformer, and the sampling delay quantity delta t is used as the delay compensation of the electronic current transformer.
In the acquisition process of the sampling delay amount in this embodiment: the electromagnetic current transformer is regarded as non-delayed, when a synchronous signal is received, the analog quantity output of the electromagnetic current transformer is immediate, and the delay of the electronic current transformer is sampling delay and is used as delay compensation quantity of UPFC protection.
In summary, the following steps:
(1) according to the scheme of the embodiment, the arrival time of the sampling value message of the electronic current transformer is measured and tested through the sampling rate self-adaptive module, the data input of the sampling rates of 10kHz and 50kHz is self-adaptive, and the merging unit module completes the analysis of the sampling value message according to the sampling rate; when the method is applied to a UPFC system, a current transformer of the UPFC system is combined with a one-time through-flow test on site, a standard current transformer is used as a reference, high-precision analog quantity acquisition is carried out, I/V precision conversion is realized by measuring the voltage on a non-inductive resistor with high precision and low temperature coefficient, the primary side is gradually increased from 0 to a rated value, the relative error of the UPFC alternating current and direct current electronic transformer is calculated at different ratio points, and the accuracy verification is realized; the hybrid sampling differential circuit delay test is completed by simultaneously accessing the electromagnetic current transformer for hybrid sampling and testing the sampling loop of the electronic current transformer, taking the electromagnetic current transformer as a reference, and is used for delay compensation in UPFC protection.
(2) According to the scheme of the embodiment, the accuracy verification and the time delay measurement are connected into the same loop, the primary side current is gradually increased, repeated wiring is reduced, field management is facilitated, and the testing efficiency is improved.
EXAMPLE III
A performance test method for an electronic current transformer comprises the following steps:
(1) inputting synchronous signals to a standard current transformer and a test electronic current transformer;
(2) the electronic current transformer is tested to output a sampling value message to the sampling rate self-adaptive module, and the sampling rate self-adaptive module judges the sampling rate and sends the sampling rate and the received sampling value message to the merging unit module; the standard current transformer outputs a sampling value message to the merging unit module;
(3) and the merging unit module compares the sampling value message output by the electronic current transformer to be tested with the sampling value message output by the standard current transformer according to the received sampling rate, and verifies the precision of the electronic current transformer to be tested by taking the measured value of the standard current transformer as a standard value.
Preferably, the method for testing the performance of the electronic current transformer further includes:
(4) inputting synchronous signals to the electronic current transformer and the electromagnetic current transformer to be tested;
(5) the electromagnetic current transformer outputs analog quantity to the delay compensation module, and the electronic current transformer is tested to output sampling value messages to the delay compensation module;
(6) the time delay compensation module compares the received time of the sampling value message output by the electronic testing current transformer with the time of the analog quantity output by the electromagnetic current transformer, tests the sampling delay quantity delta t of the electronic current transformer message relative to the analog quantity output by the electromagnetic current transformer, and the sampling delay quantity delta t is used as delay compensation during use.
Preferably, the method for testing the performance of the electronic current transformer further comprises the step (7): and changing the primary side introduced current (the primary side introduced current starts from 0 to the rated current), and recording the precision of the tested electronic current transformer and the sampling delay delta t of the tested electronic current transformer at a set ratio point.
The synchronous signals input to the standard current transformer and the test electronic current transformer and the synchronous signals input to the electromagnetic current transformer are generated by the same signal generator, so that the standard current transformer, the test electronic current transformer and the electromagnetic current transformer are synchronous.
Preferably, the specific judgment process of the sampling rate self-adaptive module for judging and testing the actual sampling rate of the electronic current transformer is as follows:
timing is started at the moment of receiving data for the first time after self-testing is started;
if the data is received at the point of 20us, the sampling rate is judged to be 50kHz, and the sampling rate judgment process is ended;
if the data is not received at the 20us point, judging again at the 40us point, if the data is received, indicating that frame loss occurs at the previous time, judging that the sampling rate is 50kHz, and ending the sampling rate judging process;
if the data is not received at the 40us point, the sampling rate is determined to be 10kHz, and the sampling rate determination process is ended.
The test method in this embodiment can be implemented based on the test apparatus in the first embodiment or the second embodiment.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides an electronic type current transformer performance test system which characterized in that: the system comprises a standard current transformer and a test electronic current transformer which are connected in series at a primary side, and further comprises a sampling rate self-adaptive module and a merging unit module;
the standard current transformer and the test electronic current transformer are provided with synchronous signal access ports for accessing synchronous signals;
the input end of the sampling rate self-adaptive module is connected with the output end of the test electronic current transformer, and the input end of the merging unit module is respectively connected with the output ends of the standard current transformer and the sampling rate self-adaptive module;
the sampling rate self-adaptive module receives a sampling value message output by the electronic current transformer to be tested and judges the sampling rate of the electronic current transformer to be tested; then, the data are transmitted to a merging unit module together with the sampling rate and the sampling value message;
the standard current transformer outputs a sampling value message to the merging unit module;
the merging unit module compares a sampling value message output by the test electronic current transformer with a sampling value message output by a standard current transformer according to the received sampling rate, calculates the relative error of the test electronic transformer relative to the standard value by taking the measured value of the standard current transformer as the standard value, and verifies the precision of the test electronic current transformer;
the electromagnetic current transformer and the delay compensation module are also included;
the primary side of the electromagnetic current transformer is connected with the primary side of the electronic current transformer to be tested in series; the output ends of the electromagnetic current transformer and the test electronic current transformer are respectively connected with the input end of the delay compensation module;
the electromagnetic current transformer is provided with a synchronous signal access port for accessing a synchronous signal;
the time delay compensation module compares the received time of the sampling value message output by the electronic testing current transformer with the time of the real-time analog quantity output by the electromagnetic current transformer, the sampling time delay of the sampling value message of the electronic testing current transformer relative to the analog quantity output by the electromagnetic current transformer is delta t, the sampling time delay is delta t and serves as time delay compensation of use, and when data measured by the electronic testing current transformer are used, the timestamp of the data needs to be compensated for delta t forwards.
2. The system for testing the performance of the electronic current transformer according to claim 1, wherein: the standard current transformer, the test electronic current transformer and the electromagnetic current transformer are used for measuring the voltage on a non-inductive resistor arranged in the standard current transformer, the test electronic current transformer and the electromagnetic current transformer to obtain a measured current value.
3. The system for testing the performance of the electronic current transformer according to claim 1, wherein: the sampling rate self-adaptive module is a sampling rate judging module and is used for judging and testing the actual sampling rate of the electronic current transformer.
4. The system for testing the performance of the electronic current transformer according to claim 3, wherein: the specific judgment process of the sampling rate self-adaptive module for judging and testing the actual sampling rate of the electronic current transformer is as follows:
timing is started at the moment of receiving data for the first time after self-testing is started;
if the data is received at the point of 20us, the sampling rate is judged to be 50kHz, and the sampling rate judgment process is ended;
if the data is not received at the 20us point, judging again at the 40us point, if the data is received, indicating that frame loss occurs at the previous time, judging that the sampling rate is 50kHz, and ending the sampling rate judging process;
if the data is not received at the 40us point, the sampling rate is determined to be 10kHz, and the sampling rate determination process is ended.
5. A performance test method for an electronic current transformer is characterized by comprising the following steps:
inputting synchronous signals to a standard current transformer and a test electronic current transformer;
the electronic current transformer is tested to output a sampling value message to the sampling rate self-adaptive module, and the sampling rate self-adaptive module judges the sampling rate and sends the sampling rate and the received sampling value message to the merging unit module; meanwhile, the standard current transformer outputs a sampling value message to the merging unit module;
the merging unit module compares a sampling value message output by the electronic current transformer to be tested with a sampling value message output by a standard current transformer according to the received sampling rate, and verifies the precision of the electronic current transformer to be tested by taking the measured value of the standard current transformer as a standard value;
further comprising: inputting synchronous signals to the electronic current transformer and the electromagnetic current transformer to be tested;
the electromagnetic current transformer outputs analog quantity to the delay compensation module, and the electronic current transformer is tested to output sampling value messages to the delay compensation module;
the time delay compensation module compares the received time of the sampling value message output by the electronic testing current transformer with the time of the real-time analog quantity output by the electromagnetic current transformer, the sampling time delay of the sampling value message of the electronic testing current transformer relative to the analog quantity output by the electromagnetic current transformer is delta t, the sampling time delay is delta t and serves as time delay compensation of use, and when data measured by the electronic testing current transformer are used, the timestamp of the data needs to be compensated for delta t forwards.
6. The method for testing the performance of the electronic current transformer according to claim 5, further comprising the steps of: and changing the current introduced to the primary side, and recording the precision of the electronic current transformer to be tested and the sampling delay delta t of the electronic current transformer to be tested at a set ratio point.
7. The method for testing the performance of the electronic current transformer according to claim 5, wherein the method comprises the following steps: the synchronous signal input to the standard current transformer and the test electronic current transformer and the synchronous signal input to the electromagnetic current transformer are generated by the same signal generator.
8. The method for testing the performance of the electronic current transformer according to claim 5, wherein the method comprises the following steps: the specific judgment process of the sampling rate self-adaptive module for judging and testing the actual sampling rate of the electronic current transformer is as follows:
timing is started at the moment of receiving data for the first time after self-testing is started;
if the data is received at the point of 20us, the sampling rate is judged to be 50kHz, and the sampling rate judgment process is ended;
if the data is not received at the 20us point, judging again at the 40us point, if the data is received, indicating that frame loss occurs at the previous time, judging that the sampling rate is 50kHz, and ending the sampling rate judging process;
if the data is not received at the 40us point, the sampling rate is determined to be 10kHz, and the sampling rate determination process is ended.
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