CN110764041A - Direct-current voltage transformer detection system and detection method based on voltage-stabilizing standard source - Google Patents
Direct-current voltage transformer detection system and detection method based on voltage-stabilizing standard source Download PDFInfo
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Abstract
The invention relates to a direct current voltage transformer detection system based on a voltage-stabilizing standard source, which comprises a high-precision voltage-stabilizing output unit, a high-precision analog acquisition unit, an analog-to-digital conversion unit, a high-precision digital acquisition unit and a compatible analog quantity and digital quantity calibrator. The invention can simultaneously carry out comprehensive detection on the analog quantity output and the digital quantity output of the direct current voltage transformer and meet the requirement on accuracy of relevant regulations of field calibration and calibration tests of the direct current voltage transformer.
Description
Technical Field
The invention belongs to the field of detection of direct current metering equipment, and particularly relates to a direct current voltage transformer detection system and a direct current voltage transformer detection method based on a voltage-stabilizing standard source.
Background
The direct current voltage transformer is a main device for measuring direct current voltage value transformation in a direct current transmission and distribution system, and characteristic parameters and key indexes of the direct current voltage transformer are directly related to the stable operation of the direct current transmission system.
In actual operation, the direct current transformer often breaks down, endangers the stable operation of the direct current system, and causes great economic loss. Therefore, effective field detection and test needs to be performed on the direct current transformer before the direct current transformer is put into operation and in operation, so that the actual performance and the operation condition of the direct current transformer are judged on the field, and the influence caused by the fault of the direct current transformer is avoided.
During calibration, the traditional direct current voltage transformer control calibration method directly applies direct current high voltage to the high voltage ends of a tested direct current voltage transformer and a standard voltage divider; the tested direct current voltage transformer and the standard voltage divider output low-voltage signals at a low-voltage end, the secondary measurement system synchronously acquires and measures the output low-voltage signals, and the actual transformation ratio of the tested direct current voltage transformer is obtained according to the nominal transformation ratio of the standard voltage divider. The measured low voltage value is converted into a high voltage value according to a rated voltage ratio. The self error of the transformer calibration method is directly superposed into the error of a standard transformer, and meanwhile, the component error of the transformer calibration instrument limits the accuracy of the traditional direct-current voltage transformer control calibration method. Thus, this drawback limits the range of applications for direct comparison transformer provers.
With the increase of domestic direct current projects, new requirements are provided for the calibration of the direct current transformers, relevant regulations and technical standards of field calibration and calibration tests of the direct current transformers are written, the direct current power distribution network is rapidly developed at the present stage and is an indispensable important component of the future power distribution network, and the research of the metering technology of the direct current power distribution network is continuously carried out. The traditional control and calibration method for the direct current voltage transformer cannot meet the requirement of relevant regulations of field calibration and calibration tests of the direct current transformer on accuracy.
Disclosure of Invention
The invention aims to provide a direct current voltage transformer detection system and a detection method based on a voltage stabilization standard source, which can simultaneously carry out comprehensive detection on analog quantity output and digital quantity output of a direct current voltage transformer and meet the accuracy requirement of relevant procedures of field calibration and calibration tests of the direct current voltage transformer.
The invention adopts the following technical scheme:
a direct current voltage transformer detection system based on a voltage stabilization standard source comprises a high-precision voltage stabilization output unit, a high-precision analog acquisition unit, an analog-to-digital conversion unit, a high-precision digital acquisition unit and a compatible analog quantity and digital quantity calibrator; the high-precision voltage stabilization output unit outputs a standard voltage direct current analog signal, and the standard voltage direct current analog signal is provided to the high-precision analog acquisition unit and the tested direct current voltage transformer; the direct current analog signal output by the direct current voltage transformer to be measured is input to the high-precision analog acquisition unit, and the high-precision analog acquisition unit is output to the compatible analog quantity and digital quantity calibrator; the direct current analog signal output by the direct current voltage transformer to be measured is input to the analog-to-digital conversion unit, the digital quantity signal output by the analog-to-digital conversion unit and the digital quantity signal output by the direct current voltage transformer to be measured are both input to the high-precision digital quantity acquisition unit, and the high-precision analog acquisition unit outputs the signals to the compatible analog quantity and digital quantity calibrator.
The high-precision voltage stabilization output unit is a rectification circuit and comprises a filter circuit, a rectification unit, a switch module unit, a control unit and an output rectification unit.
The high-precision analog acquisition unit comprises a standard voltage divider and an analog acquisition interface unit.
The standard voltage divider internally comprises a high-precision resistor, a signal of the standard voltage divider is taken from the high-precision voltage stabilization output unit and is converted into a measured analog voltage value through the high-precision resistor, and the measured analog voltage value and the standard analog voltage value are connected to the analog acquisition interface unit.
The analog-to-digital conversion unit comprises an input sampling channel and a signal acquisition device.
The input sampling channel consists of a standard resistor and a voltage follower circuit, the signal acquisition device consists of two A/D processing circuits with different frequency characteristics, and the two A/D processing circuits are respectively connected with the input sampling channel.
The high-precision digital quantity acquisition unit comprises a signal synchronization device and a signal processing device, the signal acquisition device performs synchronous sampling under the control of the signal synchronization device, the sampling signals are respectively output to medium-frequency and low-frequency voltage small signals, the sampled signals are transmitted to the signal processing device, and the signal processing device is an FIR low-pass filter and a band-pass filter.
The compatible analog quantity and digital quantity calibrator comprises a control module, an analog quantity input module, a digital quantity input analysis module and a clock synchronization module.
The analog quantity input module and the digital quantity input analysis module respectively receive the analog data quantity and the digital data quantity, the clock synchronization module is connected with the control module, the analog quantity input module and the digital quantity input analysis module, the time scale of the data quantity is controlled, and the control module processes the data provided by the analog quantity input sampling module and the digital quantity input analysis module.
A direct current voltage transformer detection method based on a voltage stabilization standard source utilizes the direct current transformer detection system, and comprises the following steps:
(1) the high-precision voltage stabilization output unit outputs a standard voltage direct current analog signal, and the standard voltage direct current analog signal is provided to the high-precision analog acquisition unit and the tested direct current voltage transformer;
(2) the direct current analog signal output by the direct current voltage transformer to be measured is input to the high-precision analog acquisition unit, and the high-precision analog acquisition unit is output to the compatible analog quantity and digital quantity calibrator for error calculation of the analog quantity signal;
(3) the direct current analog signal output by the tested direct current voltage transformer is input to an analog-to-digital conversion unit, and the analog signal is converted into a digital quantity signal;
(4) and the digital quantity signal output by the analog-to-digital conversion unit and the digital quantity signal output by the tested direct current voltage transformer are input to the high-precision digital quantity acquisition unit, and the high-precision analog acquisition unit outputs the digital quantity signal to the compatible analog quantity and digital quantity calibrator for error calculation of the digital quantity signal.
The invention has the beneficial effects that:
1. a high-frequency rectifying circuit is used as a high-precision voltage-stabilizing output unit, and an output voltage analog signal is input to a high-precision analog acquisition unit and a tested direct-current voltage transformer, so that the stability and accuracy of output voltage are ensured.
2. And (3) error calculation of the independent analog quantity signal, outputting a voltage analog signal through the tested direct current voltage transformer, inputting the direct current analog signal to a high-precision analog acquisition unit, and inputting the high-precision analog acquisition unit to a compatible analog quantity and digital quantity calibrator.
3. And (3) error calculation of the independent digital quantity signal, inputting the direct current analog signal to the analog-to-digital conversion unit, converting the analog signal to the digital quantity signal, outputting the digital quantity signal through the tested direct current voltage transformer, inputting the digital quantity signal to the high-precision digital quantity acquisition unit, and inputting the digital quantity signal to the compatible analog quantity and digital quantity calibrator to perform error calculation of the digital quantity signal.
4. The compatible analog quantity and digital quantity calibrator comprises a control module, an analog quantity input module, a digital quantity input analysis module and a clock synchronization module. The analog input module and the digital input analysis module respectively receive the analog data quantity and the digital data quantity, the clock synchronization module is connected with the control module, the analog input module and the digital input analysis module, the time scale of the data quantity is controlled, and the control module processes the data provided by the analog input sampling module and the digital input analysis module.
5. The analog-to-digital conversion unit is composed of a standard resistor, a voltage follower circuit and a double A/D processing circuit, and the two A/D processing circuits are respectively connected with the input sampling channel.
6. The digital quantity acquisition unit respectively outputs the sampling signals into intermediate-frequency and low-frequency voltage small signals, and transmits the signals obtained by sampling to the signal processing device.
7. The digital quantity signals output by the high-precision voltage-stabilizing output unit, the high-precision analog acquisition unit and the analog-to-digital conversion unit and the digital quantity signals output by the digital quantity acquisition unit are simultaneously transmitted to the controller for processing to form a relatively independent and uniform detection system.
Drawings
Fig. 1 is a schematic view of the overall structure of the detection system of the present invention.
Fig. 2 is a schematic diagram of the high-precision voltage stabilization output unit of the invention.
Fig. 3 is a schematic diagram of a high-precision analog acquisition unit of the present invention.
Fig. 4 is a schematic diagram of an analog-to-digital conversion unit according to the present invention.
Fig. 5 is a schematic diagram of a high-precision digital quantity acquisition unit according to the present invention.
Fig. 6 is a schematic diagram of a compatible analog quantity and digital quantity calibrator according to the present invention.
Detailed Description
The embodiments of the present invention are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example 1
As shown in fig. 1, a dc voltage transformer detection system based on a voltage-stabilizing standard source includes a high-precision voltage-stabilizing output unit, a high-precision analog acquisition unit, an analog-to-digital conversion unit, a high-precision digital acquisition unit, and a compatible analog and digital calibrator; the high-precision voltage stabilization output unit outputs a standard voltage direct current analog signal, and the standard voltage direct current analog signal is provided to the high-precision analog acquisition unit and the tested direct current voltage transformer; the direct current analog signal output by the direct current voltage transformer to be measured is input to the high-precision analog acquisition unit, and the high-precision analog acquisition unit is output to the compatible analog quantity and digital quantity calibrator for error calculation of the analog quantity signal; the direct current analog signal output by the direct current voltage transformer to be measured is input to the analog-to-digital conversion unit, the digital quantity signal output by the analog-to-digital conversion unit and the digital quantity signal output by the direct current voltage transformer to be measured are both input to the high-precision digital quantity acquisition unit, and the high-precision analog acquisition unit outputs to the compatible analog quantity and digital quantity calibrator for error calculation of the digital quantity signal.
As shown in fig. 2, the high-precision voltage stabilization output unit is a rectification circuit, and includes a filter circuit, a rectification unit, a switch module unit, a control unit, and an output rectification unit. And the high-precision standard DC voltage stabilizing source outputs standard DC voltage and provides the standard voltage for the DC voltage transformer to be tested.
As shown in fig. 3, the high-precision analog acquisition unit includes a standard voltage divider and an analog acquisition interface unit.
The standard voltage divider internally comprises a high-precision resistor, a signal of the standard voltage divider is taken from the high-precision voltage stabilization output unit and is converted into a measured analog voltage value through the high-precision resistor, and the measured analog voltage value and the standard analog voltage value are connected to the analog acquisition interface unit.
As shown in fig. 4, the analog-to-digital conversion unit includes an input sampling channel and a signal acquisition device.
The input sampling channel consists of a standard resistor and a voltage follower circuit, the signal acquisition device consists of two A/D processing circuits with different frequency characteristics, and the two A/D processing circuits are respectively connected with the input sampling channel.
As shown in fig. 5, the high-precision digital quantity acquisition unit includes a signal synchronization device and a signal processing device, the signal acquisition device performs synchronous sampling under the control of the signal synchronization device, respectively outputs the sampling signals as small signals of intermediate frequency and low frequency voltage, and transmits the sampled signals to the signal processing device, and the signal processing device is an FIR low-pass and band-pass filter.
As shown in fig. 6, the compatible analog quantity and digital quantity calibrator comprises a control module, an analog quantity input module, a digital quantity input analysis module and a clock synchronization module.
The analog input module and the digital input analysis module respectively receive the analog data quantity and the digital data quantity, the clock synchronization module is connected with the control module, the analog input module and the digital input analysis module, the time scale of the data quantity is controlled, and the control module processes the data provided by the analog input sampling module and the digital input analysis module.
And the high-precision voltage-stabilizing output unit, the clock synchronization module and the control module jointly complete the analog quantity checking part of the detection system.
The analog-to-digital conversion unit, the high-precision digital quantity acquisition unit, the clock synchronization module and the control module jointly form a digital quantity verification part.
The whole detection device simultaneously transmits two digital quantity signals to the compatible analog quantity and digital quantity check meter for processing through the digital quantity signals output by the high-precision voltage stabilization output unit, the high-precision analog acquisition unit and the analog-to-digital conversion unit, so that a unified detection system is formed.
Example 2
A direct current voltage transformer detection method based on a voltage stabilization standard source utilizes a detection system in embodiment 1, and specifically comprises the following steps:
(1) the high-precision voltage stabilization output unit outputs a standard voltage direct current analog signal, and the standard voltage direct current analog signal is provided to the high-precision analog acquisition unit and the tested direct current voltage transformer;
(2) the direct current analog signal output by the direct current voltage transformer to be measured is input to the high-precision analog acquisition unit, and the high-precision analog acquisition unit is output to the compatible analog quantity and digital quantity calibrator for error calculation of the analog quantity signal;
(3) the direct current analog signal output by the tested direct current voltage transformer is input to an analog-to-digital conversion unit, and the analog signal is converted into a digital quantity signal;
(4) and the digital quantity signal output by the analog-to-digital conversion unit and the digital quantity signal output by the tested direct current voltage transformer are input to the high-precision digital quantity acquisition unit, and the high-precision analog acquisition unit outputs the digital quantity signal to the compatible analog quantity and digital quantity calibrator for error calculation of the digital quantity signal.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A direct current voltage transformer detection system based on a voltage stabilization standard source is characterized by comprising a high-precision voltage stabilization output unit, a high-precision analog acquisition unit, an analog-to-digital conversion unit, a high-precision digital acquisition unit and a compatible analog quantity and digital quantity calibrator; the high-precision voltage stabilization output unit outputs a standard voltage direct current analog signal, and the standard voltage direct current analog signal is provided to the high-precision analog acquisition unit and the tested direct current voltage transformer; the direct current analog signal output by the direct current voltage transformer to be measured is input to the high-precision analog acquisition unit, and the high-precision analog acquisition unit is output to the compatible analog quantity and digital quantity calibrator; the direct current analog signal output by the direct current voltage transformer to be measured is input to the analog-to-digital conversion unit, the digital quantity signal output by the analog-to-digital conversion unit and the digital quantity signal output by the direct current voltage transformer to be measured are both input to the high-precision digital quantity acquisition unit, and the high-precision analog acquisition unit outputs the signals to the compatible analog quantity and digital quantity calibrator.
2. The system according to claim 1, wherein the high-precision regulated output unit is a rectifier circuit, and comprises a filter circuit, a rectifier unit, a switch module unit, a control unit, and an output rectifier unit.
3. The system according to claim 1, wherein the high-precision analog acquisition unit comprises a standard voltage divider and an analog acquisition interface unit.
4. The system according to claim 3, wherein the standard voltage divider internally comprises a high-precision resistor, the signal of the standard voltage divider is obtained from the high-precision voltage-stabilizing output unit and is converted into the measured analog voltage value through the high-precision resistor, and the measured analog voltage value and the standard analog voltage value are connected to the analog acquisition interface unit.
5. The system according to claim 1, wherein the analog-to-digital conversion unit comprises an input sampling channel and a signal acquisition device.
6. The system according to claim 5, wherein the input sampling channel comprises a standard resistor and a voltage follower circuit, the signal acquisition device comprises two A/D processing circuits with different frequency characteristics, and the two A/D processing circuits are respectively connected to the input sampling channel.
7. The system according to claim 1, wherein the high-precision digital quantity acquisition unit comprises a signal synchronization device and a signal processing device, the signal acquisition device performs synchronous sampling under the control of the signal synchronization device, outputs the sampled signals as small intermediate-frequency and low-frequency voltage signals, and transmits the sampled signals to the signal processing device, and the signal processing device is an FIR low-pass and band-pass filter.
8. The system according to claim 1, wherein the compatible analog and digital calibrator comprises a control module, an analog input module, a digital input analysis module and a clock synchronization module.
9. The system according to claim 8, wherein the analog input module and the digital input/analysis module respectively receive analog data and digital data, the clock synchronization module is connected to the control module, the analog input module and the digital input/analysis module, and controls the time scale of the data, and the control module processes the data provided by the analog input/sampling module and the digital input/analysis module.
10. A direct current voltage transformer detection method based on a voltage stabilization standard source is characterized by utilizing the direct current transformer detection system of any one of claims 1 to 7, and comprising the following steps of:
(1) the high-precision voltage stabilization output unit outputs a standard voltage direct current analog signal, and the standard voltage direct current analog signal is provided to the high-precision analog acquisition unit and the tested direct current voltage transformer;
(2) the direct current analog signal output by the direct current voltage transformer to be measured is input to the high-precision analog acquisition unit, and the high-precision analog acquisition unit is output to the compatible analog quantity and digital quantity calibrator for error calculation of the analog quantity signal;
(3) the direct current analog signal output by the tested direct current voltage transformer is input to an analog-to-digital conversion unit, and the analog signal is converted into a digital quantity signal;
(4) and the digital quantity signal output by the analog-to-digital conversion unit and the digital quantity signal output by the tested direct current voltage transformer are input to the high-precision digital quantity acquisition unit, and the high-precision analog acquisition unit outputs the digital quantity signal to the compatible analog quantity and digital quantity calibrator for error calculation of the digital quantity signal.
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| WO2024164165A1 (en) * | 2023-02-08 | 2024-08-15 | 云南电网有限责任公司电力科学研究院 | Digital-analog integrated voltage transformer calibration system |
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