CN113311282A - Wireless measurement method of capacitor - Google Patents
Wireless measurement method of capacitor Download PDFInfo
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- CN113311282A CN113311282A CN202110575539.XA CN202110575539A CN113311282A CN 113311282 A CN113311282 A CN 113311282A CN 202110575539 A CN202110575539 A CN 202110575539A CN 113311282 A CN113311282 A CN 113311282A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/01—Subjecting similar articles in turn to test, e.g. "go/no-go" tests in mass production; Testing objects at points as they pass through a testing station
- G01R31/013—Testing passive components
- G01R31/016—Testing of capacitors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
Abstract
The invention discloses a wireless measurement method of a capacitor, which comprises the steps of clamping the capacitor to be measured by using a current clamp to obtain a test signal; designing a test circuit, amplifying a test signal through a program control amplification module in the test circuit, and converting the amplified test signal through an A/D conversion module in the test circuit to obtain a digital signal; obtaining a measuring result through an ARM processor 1 module in the test circuit according to the digital signal, and transmitting the measuring result to an ARM processor 2 module in the test circuit; the ARM processor 2 module communicates with a wireless networking module in the test circuit through a serial port protocol, and transmits a measurement result to a terminal through the wireless networking module; by designing the test circuit, the damage of a lead wire to the porcelain bushing of the capacitor is avoided, the test efficiency is improved, and the labor intensity is reduced; the wireless acquisition of the test data is realized, and the management and analysis of the test data are facilitated.
Description
Technical Field
The invention relates to the technical field of power testing, in particular to a wireless measurement method of a capacitor.
Background
In an electric power system, in order to improve a power factor, a reactive compensation capacitor needs to be used in a large amount. The normal and stable work of the capacitor is ensured, and the method has important significance for maintaining the stability of a power grid; the capacitors are numerous and the installation positions are high, so that the workload of measurement and data acquisition is large.
At present, the capacitance lead wires are required to be removed in the compensation capacitance test, and the test is carried out one by one, so that the test efficiency is low and the workload is large; and wireless acquisition of data is not possible.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above-mentioned conventional problems.
Therefore, the invention provides a wireless measurement method of a capacitor, which can solve the problems that when a single capacitor of a compensation capacitor bank is tested, capacitor leads need to be removed, the test is carried out one by one, test data needs to be recorded by handwriting, and automatic acquisition cannot be carried out.
In order to solve the technical problems, the invention provides the following technical scheme: the method comprises the steps of clamping a capacitor to be tested by using a current clamp to obtain a test signal; amplifying the test signal through a program control amplification module, and converting the amplified test signal through an A/D conversion module to obtain a digital signal; obtaining a measurement result through an ARM processor 1 module according to the digital signal, and transmitting the measurement result to an ARM processor 2 module; the ARM processor 2 module is communicated with the wireless networking module through a serial port protocol, and the measurement result is transmitted to the terminal through the wireless networking module.
As a preferable aspect of the wireless measurement method of the capacitor according to the present invention, wherein: the testing circuit comprises a program control amplification module, a signal input protection module, a voltage division module, an A/D conversion module, an ARM processor 1 module, an ARM processor 2 module, a power amplification module and a wireless networking module.
As a preferable aspect of the wireless measurement method of the capacitor according to the present invention, wherein: the signal input protection module comprises a transient voltage suppression diode and a fuse; the transient voltage suppression diode is used for preventing signal over-range or external static electricity from flowing in so as to protect an internal chip of the instrument; the fuse is used for preventing the chip from being damaged due to short circuit of the current clamp; and the signal input protection module is respectively connected with the current clamp and the A/D conversion module.
As a preferable aspect of the wireless measurement method of the capacitor according to the present invention, wherein: the voltage division module comprises a voltage division resistor; the voltage division module is respectively connected with the A/D conversion module and the power amplifier module, and is used for carrying out voltage division processing on the sine wave output by the power amplifier module so as to reduce voltage and transmitting a processing result to the A/D conversion module.
As a preferable aspect of the wireless measurement method of the capacitor according to the present invention, wherein: the ARM processor 1 module comprises an ARM processor 1 module, the A/D conversion module and the ARM processor 2 module are connected, and capacitance measurement results are obtained through the ARM processor 1 module; and actively writing the measurement result into a buffer area of the ARM processor 2 through an internal SPI interface.
As a preferable aspect of the wireless measurement method of the capacitor according to the present invention, wherein: the ARM processor 2 module comprises an ARM processor 2 module which is respectively connected with the ARM processor 1 module and the wireless networking module and is used for transmitting the measurement result to peripheral equipment.
As a preferable aspect of the wireless measurement method of the capacitor according to the present invention, wherein: the wireless networking module comprises a wireless public network frequency band for transmission and is connected with the ARM processor 2 module through the serial port protocol.
As a preferable aspect of the wireless measurement method of the capacitor according to the present invention, wherein: when the wireless networking module receives a wireless message conforming to the self address, the ARM processor 2 module carries out data communication according to the serial port protocol; if the address in the wireless message is not consistent with the self address, the data communication processing is not carried out.
As a preferable aspect of the wireless measurement method of the capacitor according to the present invention, wherein: the transmitting power of the wireless networking module is 50 mW.
The invention has the beneficial effects that: the invention avoids the damage of the removed lead wire to the capacitor porcelain bushing, improves the testing efficiency and reduces the labor intensity; the wireless acquisition of the test data is realized, and the management and analysis of the test data are facilitated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a schematic flow chart of a wireless measurement method of a capacitor according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a test circuit connection structure of a wireless measurement method for a capacitor according to a first embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially in general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Meanwhile, in the description of the present invention, it should be noted that the terms "upper, lower, inner and outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and operate, and thus, cannot be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1 to 2, a first embodiment of the present invention provides a wireless measurement method of a capacitor, including:
s1: and clamping the capacitor to be tested by using the current clamp to obtain a test signal.
Preferably, in order to reduce the workload of the measurement process, the method adopts a current clamp mode for detection; the current clamp can detect the current flowing through a single capacitor, and the capacitance can be measured by using the voltage on the detected capacitor and the current sampled by the current clamp.
S2: and designing a test circuit.
Referring to fig. 2, the test circuit includes a program-controlled amplification module 100, a signal input protection module 200, a voltage division module 300, an a/D conversion module 400, an ARM processor 1 module 500, an ARM processor 2 module 600, a power amplifier module 700, and a wireless networking module 800.
Specifically, the main chip of the program-controlled amplification module 100 is AD8253, which is connected to the signal input protection module 200 and the a/D conversion module 400, respectively, and is configured to amplify the input weak signal to a range acceptable by the rear-stage a/D chip.
The signal input protection module 200 is respectively connected with the current clamp and the A/D conversion module 400; the signal input protection module 200 comprises a transient voltage suppression diode 201 and a fuse 202; the transient voltage suppression diode 201 is used for preventing signal overranging or external static electricity from flowing in so as to protect an instrument internal chip; the fuse 202 is used to prevent chip damage due to current clamp shorts.
The voltage dividing module 300 is composed of a voltage dividing resistor, and is respectively connected to the a/D conversion module 400 and the power amplifier module 700, and the voltage dividing module 300 is configured to divide the voltage of the sine wave output by the power amplifier module 700, so as to reduce the high input voltage to the voltage that can be received by the a/D conversion module 400.
The main chip of the a/D conversion module 400 is AD7656, which is connected to the program-controlled amplification module 100, the voltage division module 300, and the ARM processor 1 module 500, respectively, and is configured to convert an input analog value into a digital signal and provide the digital signal to the ARM processor 1 module 500.
The ARM processor 1 module 500 adopts an STM32F103RCT6 chip, the chip is provided with a 12-bit D/A output port, and by utilizing the internal D/A output function of the chip, sine waves can be simulated and output to the power amplifier module 700, so that the circuit is simplified; the ARM processor 1 module 500 is connected to the a/D conversion module 400 and the ARM processor 2 module 600, and the capacitance measurement result can be obtained by the ARM processor 1 module 500 and data communication with the ARM processor 2 module 600 can be realized.
The module 600 of the ARM processor 2 adopts an STM32F103RCT6 chip, which is connected to the module 500 of the ARM processor 1 and the wireless networking module 800, respectively, and is configured to transmit the measurement result to the peripheral.
The main chip of the power amplification module 700 is TPA3116D2, which is connected to the ARM processor 1 module 500 and the voltage division module 300, respectively, and is used for amplifying the power of the analog sine wave; the output efficiency is high, and the heat dissipation requirement can be reduced.
The wireless networking module 800 is E61-433T17D, and the transmitting power is 50 mW; the system uses a wireless public network frequency band (such as 433MHz) for transmission, and is connected with the ARM processor 2 module 600 through a serial port protocol; each wireless networking module 800 has a specific wireless address and can be set through an operation interface controlled by the ARM processor 2.
It should be noted that, in this embodiment, the "connection" refers to a circuit connection, and the module are directly connected by a wire.
S3: the test signal is amplified by the program-controlled amplification module 100, and then the amplified test signal is converted by the a/D conversion module 400 to obtain a digital signal.
Before signal amplification, the current clamp sends a test signal to the signal input protection module 200, then sends the test signal to the program control amplification module 100 through the signal input protection module 200, amplifies the test signal through the program control amplification module 100, and sends the amplified test signal to the A/D conversion module 400; the digital signal is obtained by the a/D conversion module 400.
S4: the measurement results are obtained from the digital signals and by the ARM processor 1 module 500 and transmitted to the ARM processor 2 module 600.
The ARM processor 1 module 500 reads the operation instruction of the buffer of the ARM processor 2 module 600 in an active query mode, and actively writes the measurement result into the buffer of the ARM processor 2 module 600 in an active write mode; when not measuring, ARM processor 1 module 500 only performs inquiry and write operations; when measurement is carried out, after the ARM processor 1 module 500 executes the query task, continuous sampling is kept for a period of time, and measurement calculation is completed; then, the measurement result is written into a buffer area of the ARM processor 2 module 600 through an internal SPI interface; ARM processor 1 module 500 executes tasks in a round-robin fashion with a query-measure-write cycle to ensure that its measurement process is not disturbed.
S5: the ARM processor 2 module 600 communicates with the wireless networking module 800 through a serial protocol, and transmits the measurement result to the terminal through the wireless networking module 800.
It should be noted that the wireless network module 800 adopts a structure of one master and multiple slaves, and its own slave is incorporated into the network as a slave, and does not actively send data, but only responds to the query message; other data acquisition terminals can be used as a host machine as long as the other data acquisition terminals conform to a communication protocol, and read data information of slave machines in the network in a mode of alternate query; the wireless network module 800 can be regarded as an interference source relative to the measurement part, and wireless data transmission can affect the stability of current clamp data, so that the smaller the transmission power is, the better the transmission power is; on the other hand, when the number of slave machines in the network is increased, the data updating of the whole system is slowed down if the time delay of the intermediate response link is large due to the adoption of the polling response mode for communication. Therefore, the wireless module should have smaller network delay; therefore, the transmission power of the wireless network module 800 selected in this embodiment is 50mW, and the transmission delay is low.
When the wireless networking module 800 receives a wireless message conforming to its own address, the ARM processor 2 module 600 performs data communication according to a serial protocol, thereby implementing wireless measurement; if the address in the wireless message is not consistent with the self address, the data communication processing is not carried out.
Preferably, in order to improve the data summarizing efficiency and facilitate finding out test problems, the embodiment selects a common-frequency wireless communication mode for data communication in consideration of the field use conditions; when the wireless transmission function is used, a test system comprises a plurality of slave machines and a single host machine, wherein the slave machines are used as a tester for field measurement, and the host machine is a terminal capable of reading the measurement data of the slave machines; the terminal can be a single chip microcomputer system, an embedded system or a standard PC system, as long as the terminal can be in wireless communication through public frequency and accords with the transmission protocol of a slave machine; the host computer does not carry out measurement work and is responsible for comprehensively collecting measurement data.
Example 2
The technical effects adopted in the method are verified and explained, the embodiment selects the traditional technical scheme and adopts the method to carry out comparison test, and the test results are compared by means of scientific demonstration to verify the real effect of the method.
When a single capacitor of a compensation capacitor bank is tested by the traditional technical scheme, a capacitor lead wire needs to be detached, the test is carried out one by one, test data needs to be recorded by handwriting, and automatic acquisition cannot be carried out.
Compared with the traditional technical scheme, the method does not need to dismantle a capacitor lead when testing a single capacitor of the compensation capacitor bank, can finish the test of the single and total capacitance and realize wireless automatic acquisition when testing data.
In this embodiment, capacitance tests of the compensation capacitor bank are respectively performed on xx220KV substations by using the conventional technical scheme and the method, comparative tests are performed by using the conventional technical scheme and the method, and the test efficiency is as follows:
table 1: and (5) comparing the testing efficiency of the capacitor.
| Number of capacitors | Number of test persons | Time of measurement | Data arrangement time | |
| Conventional |
200 | 6 | 16h | 6h |
| Method for producing a |
200 | 3 | 6h | 2h |
Therefore, the testing efficiency is effectively improved after the method is used, and an effective technical mode is provided for the testing work of the compensation capacitor bank of the transformer substation.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (9)
1. A wireless measurement method of a capacitor is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
clamping a capacitor to be tested by using a current clamp to obtain a test signal;
amplifying the test signal through a program control amplification module (100), and then converting the amplified test signal through an A/D conversion module (400) to obtain a digital signal;
obtaining a measurement result through an ARM processor 1 module (500) according to the digital signal, and transmitting the measurement result to an ARM processor 2 module (600);
the ARM processor 2 module (600) is communicated with the wireless networking module (800) through a serial port protocol, and the measurement result is transmitted to the terminal through the wireless networking module (800).
2. A method of wireless measurement of a capacitor according to claim 1, characterized by: also comprises the following steps of (1) preparing,
the method comprises the step of designing a test circuit, wherein the test circuit comprises a program control amplification module (100), a signal input protection module (200), a voltage division module (300), an A/D conversion module (400), an ARM processor 1 module (500), an ARM processor 2 module (600), a power amplifier module (700) and a wireless networking module (800).
3. A method of wireless measurement of a capacitor according to claim 2, characterized by: the signal input protection module (200) comprises a transient voltage suppression diode (201) and a fuse (202); the transient voltage suppression diode (201) is used for preventing signal overranging or external static electricity from flowing in so as to protect an internal chip of the instrument; the fuse (202) is used for preventing the chip from being damaged due to short circuit of the current clamp;
the signal input protection module (200) is respectively connected with the current clamp and the A/D conversion module (400).
4. A method of wireless measurement of a capacitor according to claim 2, characterized by: the voltage division module (300) comprises a voltage division resistor (301);
the voltage division module (300) is respectively connected with the A/D conversion module (400) and the power amplifier module (700), and the voltage division module (300) is used for performing voltage division processing on sine waves output by the power amplifier module (700) so as to reduce voltage and transmitting a processing result to the A/D conversion module (400).
5. A method of wireless measurement of a capacitor according to claim 1 or 2, characterized in that: the ARM processor 1 module (500) comprises,
the ARM processor 1 module (500) is connected with the A/D conversion module (400) and the ARM processor 2 module (600), and capacitance measurement results are obtained through the ARM processor 1 module (500); and actively writing the measurement result into a buffer area of the ARM processor 2(600) through an internal SPI interface.
6. A method of wireless measurement of a capacitor according to claim 1 or 2, characterized in that: the ARM processor 2 module (600) comprises,
the ARM processor 2 module (600) is respectively connected with the ARM processor 1 module (500) and the wireless networking module (800), and is used for transmitting the measurement result to an external device.
7. The method for wireless measurement of a capacitor of claim 6, wherein: the wireless networking module (800) comprises,
the wireless networking module (800) uses a wireless public network frequency band for transmission and is connected with the ARM processor 2 module (600) through the serial port protocol.
8. The method for wireless measurement of a capacitor of claim 7, wherein: also comprises the following steps of (1) preparing,
when the wireless networking module (800) receives a wireless message conforming to the address of the wireless networking module, the ARM processor 2 module (600) performs data communication according to the serial port protocol; if the address in the wireless message is not consistent with the self address, the data communication processing is not carried out.
9. A method for wireless measurement of a capacitor according to claim 7 or 8, characterized in that: the wireless networking module (800) has the transmission power of 50 mW.
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