CN113358937A - Signal synchronous sampling device in capacitor cable-free measurement - Google Patents
Signal synchronous sampling device in capacitor cable-free measurement Download PDFInfo
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- CN113358937A CN113358937A CN202110452129.6A CN202110452129A CN113358937A CN 113358937 A CN113358937 A CN 113358937A CN 202110452129 A CN202110452129 A CN 202110452129A CN 113358937 A CN113358937 A CN 113358937A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
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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
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Automation & Control Theory (AREA)
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention provides a signal synchronous sampling device in capacitor cable-free measurement, which comprises a host, a voltage measurement module and a current measurement module, wherein the host is connected with the voltage measurement module; the host mainly comprises a synchronous signal generating circuit and a first Bluetooth wireless transmission module; the voltage measuring module mainly comprises a second Bluetooth wireless transmission module and a first phase-locked loop circuit; the current measuring module mainly comprises a third Bluetooth wireless transmission module and a second phase-locked loop circuit; the host computer sends synchronizing signal, and phase-locked loop circuit adjustment voltage measurement module or current measurement module's phase place and synchronizing signal's phase place, and bluetooth wireless transmission module sends and receives voltage measurement signal and current measurement signal, and the host computer calculates received voltage measurement signal and current measurement signal to the capacitance value of signal real-time synchronization cableless measurement condenser has been realized.
Description
Technical Field
The invention relates to the technical field of electric power information, in particular to the field of capacitance measurement of a capacitor bank.
Background
According to the requirements of relevant regulations of electric power, the capacitors of the reactive compensation capacitor bank are required to be measured regularly, the reactive compensation capacitor bank is usually formed by connecting a plurality of capacitors in parallel, if the measurement is carried out by adopting a disconnecting method, the field workload is very large, the labor working efficiency is greatly improved without disconnecting the measurement, and the labor intensity is reduced. At present, the current clamp connected with a host through a cable is generally used by a power supply station for measurement, and the measurement mode requires that an operator of the current clamp and a pressurizing main control tester are closely matched and sing back and forth, so that the measurement operation is relatively complicated and the working efficiency is not high. Meanwhile, the current clamp operator needs to pull the cable to shuttle on the closely arranged capacitor array with several layers of height, and measures the current one by one, which easily causes the outstanding problems of the tester such as the instability and drop of the stay wire, the slipping of the current clamp in the process of the stay wire, the breaking of the cable of the current clamp and the like. The measuring method of the shuttle stay wire and the back-and-forth singing makes the capacitance measurement which has large task amount originally have large labor amount, long time consumption and low working efficiency.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a signal synchronous sampling device in capacitor cable-free measurement, and the cable-free measurement capacitor is realized.
In order to achieve the purpose, the invention adopts the following technical scheme:
a signal synchronous sampling device in capacitor cable-free measurement comprises a host, a voltage measurement module and a current measurement module; the main machine mainly comprises a first DSP system control circuit, a synchronous signal generating circuit, a first Bluetooth wireless transmission module and a main machine constant voltage output end; the voltage measurement module mainly comprises a second DSP system control circuit, a first sampling chip, a voltage measurement input end, a second Bluetooth wireless transmission module and a first phase-locked loop circuit; the current measuring module mainly comprises a third DSP system control circuit, a second sampling chip, a pincerlike current sensor, a third Bluetooth wireless transmission module and a second phase-locked loop circuit; the first DSP system control circuit is connected with the synchronous signal generating circuit, the first Bluetooth wireless transmission module and the constant voltage output end of the host; the second DSP system control circuit is connected with the second Bluetooth wireless transmission module and the first phase-locked loop circuit, and the first sampling chip is connected with the first phase-locked loop circuit and the voltage measurement input end; and the third DSP system control circuit is connected with the third Bluetooth wireless transmission module and the second phase-locked loop circuit, and the second sampling chip is connected with the second phase-locked loop circuit and the pincerlike current sensor.
The synchronous signal generating circuit generates a synchronous signal; the first Bluetooth wireless transmission module sending end sends a synchronous signal, the second or third Bluetooth wireless transmission module receiving end receives the synchronous signal, the second Bluetooth wireless transmission module sends a voltage measurement signal, the third Bluetooth wireless transmission module sends a current measurement signal, and the first Bluetooth wireless transmission module receiving end receives the voltage measurement signal and the current measurement signal.
The first phase-locked loop circuit adjusts the phase of the voltage measurement module to be synchronous with the phase of the synchronous signal, drives the first sampling chip to sample the voltage measurement signal, the voltage measurement signal flows into the first sampling chip from the voltage measurement input end, the first sampling chip outputs the voltage measurement signal to the second DSP system control circuit, and the second DSP system control circuit outputs the voltage measurement signal to the second Bluetooth wireless transmission module.
The second phase-locked loop circuit adjusts the phase of the current measuring module to be synchronous with the phase of the synchronous signal, drives the second sampling chip to sample the current measuring signal, the current measuring signal flows into the second sampling chip from the pincerlike current sensor, the second sampling chip outputs the current measuring signal to the third DSP system control circuit, and the third DSP system control circuit outputs the current measuring signal to the third Bluetooth wireless transmission module.
Furthermore, the voltage output by the constant voltage output end of the host machine is controlled to be output through gear selection, and the output voltage can be changed according to different capacitors.
Furthermore, the voltage sampling point measured by the voltage measuring module is close to the voltage at two ends of the capacitor, and the voltage measuring module is mainly used for reducing the error of the voltage drop of the output voltage of the constant voltage output end of the host on the transmission lead so as to improve the voltage measuring precision.
Further, in order to prevent the current from being too small, which would affect the measurement accuracy, it is generally at least necessary to ensure that the current flowing through the capacitor is above the mA level.
Further, the second DSP system control circuit performs Fourier transform on the voltage measurement signal to reduce the data transmission quantity of the second Bluetooth wireless transmission module; and the third DSP system control circuit performs Fourier transform on the current measurement signal to reduce the data transmission quantity of the third Bluetooth wireless transmission module.
Further, the first DSP system control circuit calculates the voltage signal and the current signal to obtain the capacitance value of the capacitor.
The invention has the beneficial effects that: a signal synchronous sampling device in the cable-free measurement of a capacitor is characterized in that a host computer sends out a synchronous signal, a phase-locked loop circuit is synchronous with the phase of the synchronous signal by adjusting the phase of a voltage measurement module or a current measurement module, so that the signal real-time synchronization is achieved, a Bluetooth wireless transmission module sends and receives the voltage measurement signal and the current measurement signal, and the host computer calculates the received voltage measurement signal and the received current measurement signal, so that the capacitance value of a signal cable-free measurement capacitor is synchronously measured in real time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a signal synchronous sampling device in a capacitor cableless measurement according to the present invention;
FIG. 2 is a schematic diagram of the structure of the host of the present invention;
FIG. 3 is a schematic diagram of the voltage measurement module of the present invention;
fig. 4 is a schematic structural diagram of a current measuring module according to the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
A signal synchronous sampling device in capacitor cable-free measurement comprises a host, a voltage measurement module and a current measurement module; the main machine mainly comprises a first DSP system control circuit, a synchronous signal generating circuit, a first Bluetooth wireless transmission module and a main machine constant voltage output end; the voltage measurement module mainly comprises a second DSP system control circuit, a first sampling chip, a voltage measurement input end, a second Bluetooth wireless transmission module and a first phase-locked loop circuit; the current measuring module mainly comprises a third DSP system control circuit, a second sampling chip, a pincerlike current sensor, a third Bluetooth wireless transmission module and a second phase-locked loop circuit; the first DSP system control circuit is connected with the synchronous signal generating circuit, the first Bluetooth wireless transmission module and the constant voltage output end of the host; the second DSP system control circuit is connected with the second Bluetooth wireless transmission module and the first phase-locked loop circuit, and the first sampling chip is connected with the first phase-locked loop circuit and the voltage measurement input end; and the third DSP system control circuit is connected with the third Bluetooth wireless transmission module and the second phase-locked loop circuit, and the second sampling chip is connected with the second phase-locked loop circuit and the pincerlike current sensor.
The first phase-locked loop circuit adjusts the phase of the voltage measurement module to be synchronous with the phase of the synchronous signal, drives the first sampling chip to sample the voltage measurement signal, the voltage measurement signal flows into the first sampling chip from the voltage measurement input end, the first sampling chip outputs the voltage measurement signal to the second DSP system control circuit, and the second DSP system control circuit outputs the voltage measurement signal to the second Bluetooth wireless transmission module.
The second phase-locked loop circuit adjusts the phase of the current measuring module to be synchronous with the phase of the synchronous signal, drives the second sampling chip to sample the current measuring signal, the current measuring signal flows into the second sampling chip from the pincerlike current sensor, the second sampling chip outputs the current measuring signal to the third DSP system control circuit, and the third DSP system control circuit outputs the current measuring signal to the third Bluetooth wireless transmission module.
The voltage output by the constant voltage output end of the host machine is controlled to be output by selecting gears, and the output voltage can be changed according to different capacitors to be measured. The voltage measuring module measures voltage of a voltage value taking point close to two ends of the capacitor, and mainly aims to reduce the error of voltage drop of the output voltage of the constant voltage output end of the host on a transmission lead so as to improve the voltage measuring precision. In order not to make the current too small, which would affect the measurement accuracy, it is generally at least ensured that the current flowing through the capacitor is above the mA level.
The constant voltage output end of the host and the input end of the voltage measurement module are connected with two ends of the capacitor to be measured, a jaw of the pincerlike current transformer of the current measurement module is opened, and a lead of the capacitor to be measured is arranged in the middle of the pincerlike current transformer.
The voltage output by the constant voltage output end of the host machine is output by selecting and controlling the voltage through the gear, and the output voltage can be changed according to different loads, wherein the specific gear is 2V, 4V, 8V or 16V. The influence of the voltage measurement value on the capacitance precision is mainly reflected in different voltages, so that the current flowing through a capacitance load is different, the measurement precision is influenced when the current is too small, generally, at least, the current flowing through the capacitance is ensured to be above mA level, such as the capacitance of 1uF, the impedance is equal to 3k omega, if 16V gear is used, the current is 3.2mA, and when 2V gear is used, the current is less than 1mA, and the measurement precision of a clamp meter is poor.
And the receiving end of the second Bluetooth wireless transmission module receives a synchronous signal sent by the host, measures the voltage of the capacitor to be measured through the voltage measurement module, and sends the voltage measurement signal through the sending end of the second Bluetooth wireless transmission module.
And the receiving end of the third Bluetooth wireless transmission module receives a synchronous signal sent by the host, measures the current of each capacitor branch through a clamp type current transformer of the current measurement module, and sends the current measurement signal through the sending end of the third Bluetooth wireless transmission module.
The second DSP system control circuit performs Fourier transform on the voltage measurement signal to reduce the data transmission quantity of the second Bluetooth wireless transmission module; and the third DSP system control circuit performs Fourier transform on the current measurement signal to reduce the data transmission quantity of the third Bluetooth wireless transmission module.
The synchronous signal generating circuit generates a 50Hz square wave synchronous signal which is sent by the sending end of the first Bluetooth wireless transmission module, the receiving end of the second or third Bluetooth wireless transmission module receives the 50Hz square wave synchronous signal, and the first or second phase-locked loop circuit continuously adjusts the phase of the voltage measuring module or the current measuring module so as to synchronize the phase of 12.8kHz and the phase of the 50Hz square wave synchronous signal, thereby realizing the real-time synchronization of signals.
The voltage measurement output end is connected with a pin end IN + of a first sampling chip AD7680, a pin end CONVST of the first sampling chip AD7680 is input of a sampling pulse signal of 12.8kHz, a receiving end of a second Bluetooth wireless transmission module receives a synchronous signal sent by a host, a first phase-locked loop circuit carries out continuous phase adjustment according to the phase of the synchronous signal, so that the phase of the voltage measurement module is synchronous with the phase of the synchronous signal, a pin end SDO of the first sampling chip AD7680 outputs measurement data to a first DSP system control circuit, and a pin end SCLK of the first sampling chip AD7680 is input of a clock circuit.
The receiving end of the third Bluetooth wireless transmission module receives the phase of the synchronous signal sent by the host and adjusts the phase of the current measurement module to be synchronous with the phase of the synchronous signal, and the voltage signal of the capacitor to be measured by the current measurement module is sent out through the sending end of the third Bluetooth wireless transmission module.
The clamp-on current sensor is connected with a pin terminal IN-of a second sampling chip AD7680, a pin terminal CONVST of the second sampling chip AD7680 is input of a sampling pulse signal of 12.8kHz, a receiving end of a third Bluetooth wireless transmission module receives a synchronous signal sent by a host, a second phase-locked loop circuit carries out continuous phase adjustment according to the phase of the synchronous signal, so that the phase of a current measuring module is synchronous with the phase of the synchronous signal, a pin terminal SDO of the second sampling chip AD7680 outputs measured data to a DSP system control circuit, and a pin terminal SCLK of the second sampling chip AD7680 is input of a clock circuit.
The host computer sends synchronizing signal through the sending terminal of first bluetooth wireless transmission module, and voltage measurement module carries out voltage measurement signal sampling after receiving synchronizing signal, and voltage signal that voltage measurement module measured exports to first sampling chip AD7680, and first sampling chip AD6780 sends voltage measurement signal to second DSP system control circuit with voltage signal transmission, through the sending terminal of second bluetooth wireless transmission module.
The host computer sends synchronizing signal through bluetooth wireless transmission module's sending terminal, and current measurement module carries out current measurement signal sampling after receiving synchronizing signal, and the current signal that current measurement module measured exports to second sampling chip AD7680, and second sampling chip AD6780 transmits current measurement signal to third DSP system control circuit, sends current measurement signal through third bluetooth wireless transmission module's sending terminal.
The first Bluetooth wireless transmission module receiving end receives a voltage measurement signal sent by the voltage measurement module and a current measurement signal sent by the current measurement module, the first DSP system control circuit calculates the received voltage measurement signal and current measurement signal to obtain a capacitance value of the measurement capacitor, and the calculation mode is as follows:
defining a current signal: real _ i (real part) and image _ i (imaginary part);
defining a voltage signal: real _ u (real part) and image _ u (imaginary part).
tmpf2 ═ real _ i + image _ i ═ image _ i; // calculation 1
tmpf1 ═ real _ u × real _ i + image _ u × image _ i; // calculation 2
r-tmpf 1/tmpf 2; // resistance value
Tmpf 3-image u real i-real u image i; // calculation 3
x is tmpf3/tmpf 2; and/capacitance or inductance values, where x is a positive value and a negative value.
In the description of the present invention, it should be noted that the terms "first", "second" and "third" are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.
Claims (6)
1. A signal synchronous sampling device in capacitor cable-free measurement is characterized by comprising a host, a voltage measuring module and a current measuring module; the main machine mainly comprises a synchronous signal generating circuit and a first Bluetooth wireless transmission module, the synchronous signal generating circuit is connected with the first Bluetooth wireless transmission module, the synchronous signal generating circuit generates a synchronous signal, and the first Bluetooth wireless transmission module receives a voltage measuring signal or a current measuring signal and sends the synchronous signal; the voltage measurement module mainly comprises a first phase-locked loop circuit and a second Bluetooth wireless transmission module, the first phase-locked loop circuit is connected with the second Bluetooth wireless transmission module, the second Bluetooth wireless transmission module receives a synchronous signal and sends a voltage measurement signal, and the first phase-locked loop circuit performs continuous phase adjustment according to the phase of the synchronous signal so that the phase of the voltage measurement module is synchronous with the phase of the synchronous signal; the current measuring module mainly comprises a second phase-locked loop circuit and a third Bluetooth wireless transmission module, the second phase-locked loop circuit is connected with the third Bluetooth wireless transmission module, the third Bluetooth wireless transmission module receives a synchronous signal and sends a current measuring signal, and the second phase-locked loop circuit performs continuous phase adjustment according to the phase of the synchronous signal, so that the phase of the current measuring module is synchronous with the phase of the synchronous signal.
2. The device for synchronously sampling signals in the capless measurement of the capacitor as claimed in claim 1, wherein the host further comprises a first DSP system control circuit and a host constant voltage output terminal, the first DSP system control circuit is connected with the host constant voltage output terminal, the synchronous signal generating circuit and the first bluetooth wireless transmission module; the first DSP system control circuit calculates a voltage measurement signal and a current measurement signal to obtain a capacitance value of the capacitor, and the output voltage of the constant voltage output end of the host machine is output by selecting and controlling the voltage through gears.
3. The signal synchronous sampling device in the capless measurement of the capacitor according to claim 1, wherein the voltage measurement module further comprises a second DSP system control circuit, a first sampling chip and a voltage measurement input terminal, the second DSP system control circuit is connected with a second bluetooth wireless transmission module and the first sampling chip, and the first sampling chip is connected with the first phase-locked loop circuit and the voltage measurement input terminal; the phase place of voltage measurement module and synchronizing signal's phase place synchronization drive first sampling chip carries out the voltage measurement signal sampling, and the voltage measurement signal flows into first sampling chip from the voltage measurement input, first sampling chip exports voltage measurement signal to second DSP system control circuit, second DSP system control circuit exports voltage measurement signal to second bluetooth wireless transmission module again.
4. The signal synchronous sampling device in the capless measurement of the capacitor according to claim 1, wherein the current measurement module further comprises a third DSP system control circuit, a second sampling chip and a pincerlike current sensor, the third DSP system control circuit is connected with a third bluetooth wireless transmission module and the second sampling chip, and the second sampling chip is connected with a second phase-locked loop circuit and the pincerlike current sensor; the phase of the current measuring module is synchronous with that of the synchronous signal, the second sampling chip is driven to sample the current measuring signal, the current measuring signal flows into the second sampling chip from the pincerlike current sensor, the second sampling chip outputs the current measuring signal to the third DSP system control circuit, and the third DSP system control circuit outputs the current measuring signal to the third Bluetooth wireless transmission module.
5. The device for synchronously sampling signals in the capless measurement according to claim 3, wherein the second DSP system control circuit performs Fourier transform on the voltage measurement signals to reduce the data transmission amount of the second Bluetooth wireless transmission module.
6. The device for synchronously sampling signals in the capless measurement according to claim 4, wherein the third DSP system control circuit performs Fourier transform on the current measurement signals to reduce the data transmission amount of the third Bluetooth wireless transmission module.
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