CN111257610A - Ultra-large current testing method based on Rogowski coil - Google Patents
Ultra-large current testing method based on Rogowski coil Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
The invention discloses a Rogowski coil-based ultra-large current testing method, which comprises the following steps of: step 1: winding the Rogowski coil on a pulse power supply, and calibrating; step 2: the remote monitoring upper computer sends an acquisition instruction to the pulse power supply and excites the pulse power supply to transmit an acquisition pulse signal; and step 3: transmitting the collected pulse signals to an integrator through a Rogowski coil for signal conditioning to obtain conditioned pulse signals; and 4, step 4: transmitting the conditioning pulse signal to a current acquisition and storage device for data acquisition and storage to obtain a storage digital signal; and 5: and transmitting the stored digital signal to an upper computer for analysis processing to obtain current data. The invention solves the problems of insufficient test stability, limited range and low measurement precision of the high-power pulse power supply, realizes the test research of the large current of the pulse power supply based on the transient frequency response characteristic and the amplitude response characteristic of the Rogowski coil, and improves the test stability and the measurement precision of the high-power pulse power supply.
Description
Technical Field
The invention relates to the technical field of pulse power supply testing, in particular to a Rogowski coil-based ultra-large current testing method.
Background
The pulse power heavy current technology plays a wide role in many fields, makes the most outstanding contribution in the aspects of national defense and military industry, can be applied to high-energy pulse weapons, electromagnetic rail guns and explosive detonation, and plays an important role in novel weaponry such as electromagnetic ejectors on aircraft carrier decks, large-scale surface ships and the like. Moreover, the pulse power high current technology is applied to the civil field, such as an electric spark source, biomedical sterilization, high-speed radiation photography and the like, is developed on the basis of the pulse high current, and can also be applied to the electrical engineering industries such as high-voltage transportation, power electronic transformers and the like.
Non-patent document 1, "dc large current measurement technology research" proposes a peak difference type dc test method for a single-core magnetic modulator, but since an ac excitation current and a compensation current are additionally applied in closed-loop measurement, power loss and design complexity are increased.
Patent document 1, patent name: a Hall effect testing device of a high-intensity magnetic field and a testing method thereof are disclosed as follows: CN1885050A, proposes that a controllable voltage-stabilizing direct current source with three-phase alternating current input is used to obtain a high-strength magnetic field, and the high-strength magnetic field significantly increases the generated hall voltage and improves the measurement accuracy. But the corresponding operation is complicated and requires a lot of instruments.
Disclosure of Invention
The invention aims to provide a Rogowski coil-based ultra-large current testing method. The method aims to solve the problems of insufficient test stability, limited range and low measurement precision of the high-power pulse power supply, realizes test research of large current of the pulse power supply based on transient frequency response characteristics and amplitude response characteristics of the Rogowski coil, and improves the test stability and the measurement precision of the high-power pulse power supply.
In order to achieve the purpose, the invention provides a Rogowski coil-based ultra-large current testing method, which comprises the following steps of:
step 1: winding the Rogowski coil on a pulse power supply, and calibrating the measurement precision of the Rogowski coil;
step 2: the remote monitoring upper computer sends an acquisition instruction to the pulse power supply and excites the pulse power supply to transmit an acquisition pulse signal;
and step 3: transmitting the collected pulse signals to an integrator through a Rogowski coil, and conditioning the signals to obtain conditioned pulse signals;
and 4, step 4: transmitting the conditioning pulse signal to a current acquisition and storage device, and acquiring and storing data to obtain a storage digital signal;
and 5: and transmitting the stored digital signal to an upper computer, and carrying out analysis processing according to the measurement precision of the Rogowski coil to obtain the current data of the pulse power supply.
Most preferably, the signal conditioning further comprises the steps of:
step 3.1: after receiving the collected pulse signal, the Rogowski coil outputs the current information of the pulse power supply;
step 3.2: and transmitting the current information to an integrator for conditioning treatment to obtain a conditioning pulse signal.
Most preferably, the current information is a differential value of the current of the pulse power supply with respect to time; the conditioning pulse signal is a current waveform diagram of the pulse power supply.
Most preferably, the rogowski coil is used in conjunction with an integrator to directly convert the differential value of the current of the pulsed power supply with respect to time into a current waveform diagram.
Most preferably, the integrator is disposed in the current sampler; and a power supply module of the current sampling and storing device is used for providing direct current power supply for the integrator.
Most preferably, the data acquisition and storage further comprises the steps of:
step 4.1: transmitting the conditioning pulse signal to an A/D conversion module of a current sampling and storing device for analog-to-digital conversion to obtain a conversion digital signal;
step 4.2: transmitting the data digital signal to an FPGA of a current acquisition and storage device for acquisition and processing to obtain an acquired digital signal;
step 4.3: and transmitting the acquired digital signals to a Flash storage module of the current acquisition and storage device for storage processing to obtain stored digital signals, and displaying the stored digital signals on a data receiving interface of the current acquisition device.
Most preferably, before data acquisition and storage, a Flash storage module of the current acquisition and storage device needs to be erased through a remote monitoring upper computer.
Most preferably, the storage digital signal is a Flash storage module of the current acquisition and storage device read by a USB reading module of the current acquisition and storage device and transmitted to the upper computer by a wired cable.
Most preferably, the parsing process further comprises the steps of:
step 5.1: reading and analyzing the stored digital signal to obtain the voltage information of the pulse power supply;
step 5.2: processing the voltage information to obtain a maximum voltage peak value in the voltage information;
step 5.3: and converting the maximum voltage peak value into the maximum current value according to the measurement precision of the Rogowski coil to obtain current data.
Most preferably, the remote monitoring upper computer sends the acquisition instruction to a wireless transceiver module in the current acquisition and storage device through the wireless control module, and transmits the acquisition instruction to the pulse power supply through the wireless transceiver module.
By applying the invention, the problems of insufficient test stability, limited range and low measurement precision of the high-power pulse power supply are solved, the test research of the large current of the pulse power supply is realized based on the transient frequency response characteristic and the amplitude response characteristic of the Rogowski coil, and the test stability and the measurement precision of the high-power pulse power supply are improved.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with the existing direct current transformer testing technology, shunt testing technology, Hall effect testing technology, magneto-optical effect testing technology and Rogowski coil testing technology, the Rogowski coil-based current measuring device is simple in structure, small in size, light in weight and convenient to operate, can be directly sleeved on the surface of a measured conductor, does not need to detach a measured object and does not contact the measured circuit, and the circuit is not affected.
2. The Rogowski coil provided by the invention has high measurement precision and good linearity.
3. The testing method provided by the invention can be directly connected with an oscilloscope and data acquisition equipment at the rear ends of the Rogowski coil and the integrator, and is convenient for observing the waveform of the current to be tested.
4. The Rogowski coil provided by the invention has small internal resistance, very little induced voltage when the Rogowski coil works, low power consumption and safe use.
Drawings
FIG. 1 is a flow chart of a Rogowski coil-based ultra-large current testing method provided by the invention;
fig. 2 is a current waveform curve of the pulse power supply measured when the peak signal of the rogowski coil in this embodiment is 2.96768V.
Detailed Description
The invention will be further described by the following specific examples in conjunction with the drawings, which are provided for illustration only and are not intended to limit the scope of the invention.
The invention provides a Rogowski coil-based ultra-large current testing method, which comprises the following steps of:
step 1: and winding the Rogowski coil on a confluence device of a pulse power supply in the positive direction, and calibrating the measurement precision of the Rogowski coil.
In this embodiment, the measurement accuracy of the rogowski coil is calibrated, and a kilo-ampere (kA) high-stability direct current source is selected as the current information of the pulse power supply, so as to obtain a corresponding actually measured current value, as shown in table 1 below.
TABLE 1 actual measured Current value of high-stability high-k-A DC Current Source
The calibration data in table 1 above is subjected to data processing in origin software, and a fitted linear equation of six points is obtained:
Y＝0.99622X+8.72374×10-5
as can be seen from the above equation, the value b in the linear equation Y ═ kX + b is almost 0, and is consistent with the parameters of the instruction manual; the slope k is the corresponding relation between the actual output value of the coil and the standard value, i.e. the sensitivity of the Rogowski coil is 1V/MA, and the calibration coefficient is 0.99622.
Step 2: the remote monitoring upper computer sends an acquisition instruction to the pulse power supply and excites the pulse power supply to transmit an acquisition pulse signal; the remote monitoring upper computer sends a collection instruction to the wireless transceiver module in the current collection and storage device through the wireless control module, and transmits the collection instruction to the pulse power supply through the wireless transceiver module.
In this embodiment, electromagnetic environment simulation analysis is performed on the pulsed power supply, and it is found that, at a position 1 meter away from the pulsed power supply, the magnetic flux density is only 0.0013T, which is much lower than the magnetic field strength limit of a general electronic component by 0.01T.
In order to test the working performance of the remote wireless control module and ensure the reliability as much as possible, when the system is debugged, the current test experimental environment is simulated, the distance between the current sampling and storing device and the remote monitoring upper computer is controlled to be near 100 meters, and the wireless transceiving module is used for signal transmission. In this embodiment, the wireless transceiver module is a suction cup type transceiver antenna.
And step 3: transmitting the collected pulse signals to an integrator through a Rogowski coil, and conditioning the signals to obtain conditioned pulse signals; the signal conditioning further comprises the steps of:
step 3.1: after receiving the collected pulse signal, the Rogowski coil outputs the current information of the pulse power supply; the current information is a differential value of the current of the pulse power supply with respect to time.
Step 3.2: the current information is transmitted to an integrator for conditioning treatment to obtain a conditioning pulse signal; the conditioning pulse signal is a current waveform diagram of the pulse power supply.
The Rogowski coil and the integrator are used in combination, and the differential value of the current of the pulse power supply to time is directly converted into a current waveform diagram of the pulse power supply.
And 4, step 4: transmitting the conditioning pulse signal to a current acquisition and storage device, and acquiring and storing data to obtain a storage digital signal; the data acquisition and storage further comprises the following steps:
step 4.1: transmitting the conditioning pulse signal to an analog-to-digital (A/D) conversion module of the current sampling and storing device for analog-to-digital conversion to obtain a conversion digital signal;
step 4.2: transmitting the converted digital signals to a Field Programmable Gate Array (FPGA) of a current acquisition and storage device for acquisition and processing to obtain acquired digital signals;
step 4.3: and transmitting the acquired digital signals to a Flash storage module of the current acquisition and storage device for storage processing to obtain stored digital signals, and displaying the stored digital signals on a data receiving interface of the current acquisition device.
Before data acquisition and storage, a Flash storage module of the current acquisition and storage device needs to be erased through a remote monitoring upper computer.
Meanwhile, the integrator is arranged in the current sampling and storing device, and a 24V direct current power supply is provided for the integrator through a power supply module of the current sampling and storing device.
In this embodiment, the current sampling and storing device collects the stored digital signal, and the data receiving interface of the current sampling and storing device successively receives nine sets of data sequences in table 2 below, and as can be seen from the nine sets of sequences, the values of the sixth column with the address being eight higher and the seventh column with the address being eight lower in the Flash memory module are increasing, which indicates that the data recording function of the current sampling and storing device is started, and the stored digital signal is circularly written into the Flash memory module in the current sampling and storing device.
TABLE 2 data sequence received by data receiving interface of current sampling memory when receiving sampling instruction
| EB | 90 | 00 | 00 | 00 | 00 | 01 | CD | 0D | 0A |
| EB | 90 | 00 | 01 | 00 | 00 | 06 | CD | 0D | 0A |
| EB | 90 | 00 | 02 | 00 | 00 | 0A | CD | 0D | 0A |
| EB | 90 | 00 | 03 | 00 | 00 | 0E | CD | 0D | 0A |
| EB | 90 | 00 | 04 | 00 | 00 | 11 | CD | 0D | 0A |
| EB | 90 | 00 | 05 | 00 | 00 | 15 | CD | 0D | 0A |
| EB | 90 | 00 | 06 | 00 | 00 | 19 | CD | 0D | 0A |
| EB | 90 | 00 | 07 | 00 | 00 | 1D | CD | 0D | 0A |
| EB | 90 | 00 | 08 | 00 | 00 | 21 | CD | 0D | 0A |
When the remote monitoring upper computer stops sending the acquisition instruction to the current acquisition device, the data receiving interface also continuously receives nine groups of data sequences, as shown in the following table 3, different from the table 2, the values of the sixth column and the seventh column representing the address in the Flash storage module in the nine groups of data sequences are fixed, and the storage digital signal stops being written in the current address.
TABLE 3 data sequence received by data receiving interface of current sampler after stopping receiving acquisition command
| EB | 90 | 00 | 09 | 00 | 00 | 25 | CD | 0D | 0A |
| EB | 90 | 00 | 0A | 00 | 01 | 85 | CD | 0D | 0A |
| EB | 90 | 00 | 0B | 00 | 01 | 85 | CD | 0D | 0A |
| EB | 90 | 00 | 0C | 00 | 01 | 85 | CD | 0D | 0A |
| EB | 90 | 00 | 0D | 00 | 01 | 85 | CD | 0D | 0A |
| EB | 90 | 00 | 0E | 00 | 01 | 85 | CD | 0D | 0A |
| EB | 90 | 00 | 0F | 00 | 01 | 85 | CD | 0D | 0A |
| EB | 90 | 00 | 10 | 00 | 01 | 85 | CD | 0D | 0A |
| EB | 90 | 00 | 11 | 00 | 01 | 85 | CD | 0D | 0A |
| EB | 90 | 00 | 12 | 00 | 01 | 85 | CD | 0D | 0A |
And 5: and a USB reading module of the current acquisition and storage device reads the storage digital signal in the Flash storage module, transmits the storage digital signal to an upper computer through a wired cable, and carries out analysis processing according to the measurement precision of the Rogowski coil to obtain the current data of the pulse power supply.
Wherein, the analysis processing further comprises the following steps:
step 5.1: reading and analyzing the stored digital signal to obtain the voltage information of the pulse power supply;
step 5.2: processing the voltage information to obtain a maximum voltage peak value in the voltage information;
step 5.3: and converting the maximum voltage peak value into the maximum current value according to the measurement precision of the Rogowski coil to obtain the current data of the pulse power supply.
In this embodiment, after verifying that all the modules can work normally, the pulse power supply performs the charge and discharge test in the above steps, so as to complete the test of the current of the pulse power supply, and finally obtain current data.
First, the current curve of the original data after undergoing origin low-pass filtering processing at 10kHz shows that the pulse width of the pulse current signal is about 15 mus. As shown in fig. 2, the peak signal of the pulse signal obtained by maximizing the curve in origin software is 2.96768V, and then according to the sensitivity of rogowski coil 1V/MA and the calibration coefficient of coil 0.99622, the actually measured pulse current peak value is:
Imax＝2.96768×0.99622＝2.96402MA
that is, the maximum value of the pulse current is 2.96402 MA.
The working principle of the invention is as follows:
winding the Rogowski coil on a pulse power supply, and calibrating the measurement precision of the Rogowski coil; the remote monitoring upper computer sends an acquisition instruction to the pulse power supply and excites the pulse power supply to transmit an acquisition pulse signal; transmitting the collected pulse signals to an integrator through a Rogowski coil, and conditioning the signals to obtain conditioned pulse signals; transmitting the conditioning pulse signal to a current acquisition and storage device, and acquiring and storing data to obtain a storage digital signal; and transmitting the stored digital signal to an upper computer, and carrying out analysis processing according to the measurement precision of the Rogowski coil to obtain the current data of the pulse power supply.
In conclusion, the extra-large current testing method based on the Rogowski coil solves the problems of insufficient stability, limited range and low measurement precision of a high-power pulse power supply test, realizes the test research of the large current of the pulse power supply based on the transient frequency response characteristic and the amplitude response characteristic of the Rogowski coil, and improves the stability and the measurement precision of the high-power pulse power supply test.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A giant current test method based on a Rogowski coil is characterized by comprising the following steps:
step 1: winding the Rogowski coil on a pulse power supply, and calibrating the measurement precision of the Rogowski coil;
step 2: the remote monitoring upper computer sends an acquisition instruction to the pulse power supply and excites the pulse power supply to transmit an acquisition pulse signal;
and step 3: transmitting the acquired pulse signal to an integrator through a Rogowski coil, and conditioning the signal to obtain a conditioned pulse signal;
and 4, step 4: transmitting the conditioning pulse signal to a current acquisition and storage device, and acquiring and storing data to obtain a storage digital signal;
and 5: and transmitting the stored digital signal to an upper computer, and carrying out analysis processing according to the measurement precision of the Rogowski coil to obtain the current data of the pulse power supply.
2. The rogowski coil-based very high current test method according to claim 1, wherein the signal conditioning further comprises the steps of:
step 3.1: after receiving the collected pulse signal, the Rogowski coil outputs current information of a pulse power supply;
step 3.2: and the current information is transmitted to the integrator for conditioning treatment to obtain a conditioning pulse signal.
3. The Rogowski coil-based ultra-large current test method as claimed in claim 2, wherein the current information is a differential value of the current of the pulse power supply with respect to time; the conditioning pulse signal is a current waveform diagram of the pulse power supply.
4. The Rogowski coil-based ultra-high current test method as claimed in claim 3, wherein the Rogowski coil is used in combination with the integrator to directly convert the differential value of the current of the pulse power supply with respect to time into the current waveform diagram.
5. The Rogowski coil-based ultra-high current test method as claimed in claim 4, wherein the integrator is arranged in the current sampling device, and a power module of the current sampling device is used for providing a direct current power supply for the integrator.
6. The Rogowski coil-based ultra-high current testing method as claimed in claim 1, wherein the data acquisition and storage further comprises the steps of:
step 4.1: transmitting the conditioning pulse signal to an A/D conversion module of a current sampling and storing device for analog-to-digital conversion to obtain a conversion digital signal;
step 4.2: transmitting the converted digital signal to an FPGA of a current acquisition and storage device for acquisition and processing to obtain an acquired digital signal;
step 4.3: and transmitting the acquired digital signals to a Flash storage module of the current acquisition and storage device for storage processing to obtain stored digital signals, and displaying the stored digital signals on a data receiving interface of the current acquisition device.
7. The method for testing the ultra-high current based on the rogowski coil, as claimed in claim 6, wherein before the data acquisition and storage, the Flash storage module is further erased by a remote monitoring upper computer.
8. The Rogowski coil-based ultra-high current testing method as claimed in claim 6, wherein the storing digital signal is obtained by reading the Flash memory module through a USB reading module of a current sampling and storing device and transmitting the Flash memory module to the upper computer through a wired cable.
9. The method for testing the ultra-high current based on the rogowski coil as claimed in claim 1, wherein the analysis process further comprises the steps of:
step 5.1: reading and analyzing the stored digital signal to obtain voltage information of the pulse power supply;
step 5.2: processing the voltage information to obtain a maximum voltage peak value in the voltage information;
step 5.3: and converting the maximum voltage peak value into a maximum current value according to the measurement precision of the Rogowski coil to obtain the current data.
10. The method for testing the ultra-high current based on the Rogowski coil as claimed in claim 1, wherein the remote monitoring upper computer sends the acquisition command to a wireless transceiver module in the current acquisition and storage device through a wireless control module, and transmits the acquisition command to the pulse power supply through the wireless transceiver module.
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| CN113484593A (en) * | 2021-06-16 | 2021-10-08 | 南京理工大学 | Data acquisition system for high-power pulse power supply |
| CN114935684A (en) * | 2022-04-28 | 2022-08-23 | 宁波市计量测试研究院(宁波新材料检验检测中心) | Electromagnet current waveform real-time monitoring and analyzing system and method |
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