CN216697089U - Multifunctional standard voltage source for state detection of power equipment - Google Patents
Multifunctional standard voltage source for state detection of power equipment Download PDFInfo
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- CN216697089U CN216697089U CN202123347223.XU CN202123347223U CN216697089U CN 216697089 U CN216697089 U CN 216697089U CN 202123347223 U CN202123347223 U CN 202123347223U CN 216697089 U CN216697089 U CN 216697089U
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Abstract
The utility model discloses a multifunctional standard voltage source for power equipment state detection, which comprises an A, B, C three-phase digital voltage generator, wherein the A, B, C three-phase digital voltage generator is correspondingly connected with a A, B, C three-phase digital-to-analog conversion circuit, the output of the A, B, C three-phase digital-to-analog conversion circuit is output to a A, B, C three-phase standard voltage source through a corresponding A, B, C three-phase power amplifier, and the output A, B, C three-phase standard voltage source is fed back to the A, B, C three-phase digital voltage generator through a correspondingly connected A, B, C three-phase analog-to-digital conversion circuit. According to the utility model, the three-phase standard voltage source voltage output is formed by the three-phase digital voltage generator through digital-to-analog conversion and the power amplifier, and different voltage sources can be flexibly adjusted and output according to the state detection requirement of the secondary measurement equipment; the method can provide accurate, stable and various standard voltage source signals for the state detection of the electric power secondary measurement equipment.
Description
Technical Field
The utility model belongs to the power supply configuration technology, and particularly relates to a multifunctional standard voltage source for power equipment state detection.
Background
Many secondary measurement devices in the field of electrical engineering, such as electronic electric energy meters, analog input merging units, etc., require a standard power source to perform various performance and state detections, and require the power source to output standard direct-current voltage signals and sinusoidal voltage signals under multiple frequencies according to requirements. However, with the grid-connected operation of a high-proportion new energy system, the phenomenon of harmonic pollution is increasingly serious, and the engineering adaptability of secondary measurement equipment is poor. The single direct current signal and the standard sinusoidal signal do not meet the state detection and performance evaluation of various electric power secondary measurement devices, and therefore a voltage source capable of outputting various voltage signals such as alternating current and direct current, engineering real load signals and the like is needed to improve the engineering adaptability of the electric power secondary measurement devices.
Disclosure of Invention
The utility model aims to provide a multifunctional standard voltage source for state detection of power equipment.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
a multifunctional standard voltage source facing to power equipment state detection comprises a digital voltage generator, wherein the digital voltage generator is an A, B, C three-phase digital voltage generator, the A, B, C three-phase digital voltage generator is correspondingly connected with a A, B, C three-phase digital-to-analog conversion circuit, the output of the A, B, C three-phase digital-to-analog conversion circuit is output to an A, B, C three-phase standard voltage source through a corresponding A, B, C three-phase power amplifier, the output A, B, C three-phase standard voltage source is fed back to the A, B, C three-phase digital voltage generator through a correspondingly connected A, B, C three-phase analog-to-digital conversion circuit, and the A, B, C three-phase standard voltage source is used for output stable control.
The scheme is further as follows: the A, B, C three-phase digital voltage generator is a computer with a regulating module that has the function of regulating the output A, B, C three-phase different direct current digital voltages and different alternating current digital voltages and frequencies.
The scheme is further as follows: the A, B, C three-phase digital-to-analog conversion circuit comprises an FPAG programmable gate array chip, three digital-to-analog conversion chips and three filters, wherein the FPAG programmable gate array chip is connected with a digital voltage generator through an RS232 interface circuit, the FPAG programmable gate array chip respectively sends received A, B, C three-phase digital voltage signals to the three digital-to-analog conversion chips through SPI serial interfaces, and the outputs of the three digital-to-analog conversion chips are respectively connected with A, B, C three-phase power amplifiers through the filters.
The scheme is further as follows: the A, B, C three-phase analog-to-digital conversion circuit comprises an FPAG programmable gate array chip and three analog-to-digital conversion chips, wherein the three analog-to-digital conversion chips are respectively connected with a A, B, C three-phase standard voltage source, A, B, C three-phase digital voltage signals converted by the analog-to-digital conversion chips are respectively connected with the FPAG programmable gate array chip through SPI serial interfaces, and the FPAG programmable gate array chip is used for connecting A, B, C three-phase digital voltage signals received by the FPAG programmable gate array chip with a A, B, C three-phase digital voltage generator through a DSP digital signal processor and an RS232 interface circuit.
The utility model has the beneficial effects that: a three-phase standard voltage source voltage output is formed by a three-phase digital voltage generator through digital-to-analog conversion and a power amplifier, and different voltage sources can be flexibly adjusted and output through the voltage source according to the state detection requirement of secondary measurement equipment; the device has the characteristics of stable performance, convenience in use, safety and reliability, and can provide accurate, stable and various standard voltage source signals for the state detection of the power secondary measurement equipment.
The utility model is described in detail below with reference to the figures and examples.
Drawings
FIG. 1 is a block diagram of the circuit configuration of the present invention;
FIG. 2 is a block diagram of A, B, C three-phase digital-to-analog conversion circuit according to the present invention;
fig. 3 is a block diagram of A, B, C three-phase analog-to-digital conversion circuit of the present invention.
Detailed Description
A multifunctional standard voltage source facing to the state detection of power equipment is disclosed in FIG. 1, and comprises a digital voltage generator, wherein the digital voltage generator is an A, B, C three-phase digital voltage generator, a A, B, C three-phase digital voltage generator 1 is correspondingly connected with A, B, C three-phase digital-to-analog conversion circuit 2, the output of A, B, C three-phase digital-to-analog conversion circuit 2 is output as A, B, C three-phase standard voltage source through a corresponding A, B, C three-phase power amplifier 3, and the output A, B, C three-phase standard voltage source is fed back to A, B, C three-phase digital voltage generator 1 through a correspondingly connected A, B, C three-phase analog-to-digital conversion circuit 4, and is used for precise and stable control of the output A, B, C three-phase standard voltage source. A standard dc power supply 5 provides high precision positive and negative 120 volt dc power to the A, B, C three-phase power amplifier 3.
Wherein: the A, B, C three-phase digital voltage generator 1 is a computer with a regulating module that has two functions:
one function is to provide different selection buttons in the adjustment module, for example: the adjusting module is provided with a Matlab or Labview tool platform, and analog waveforms expressed by sin functions can be digitized through the Matlab or Labview tool platform to extract digitized fundamental frequency signals, so that the function of adjusting and outputting A, B, C three-phase different direct current digital voltages and different alternating current digital voltages and frequencies is formed.
Another kind of function is to be provided with the signal acquisition interface in the regulating module, when being used for the adaptability detection under the complicated operating mode of power equipment, can select to gather the recurrence output to the on-the-spot real load waveform, for example: the method comprises the steps of collecting voltage signals of a secondary winding of a voltage transformer of the transformer substation, calculating the amplitude, frequency and phase of the signals once every second, and sending the amplitude, frequency and phase of the real load signals to a digital-to-analog conversion module to output analog waveforms. And then the amplitude and the phase of the output voltage are controlled by a feedback circuit, and the output of the program-controlled power source is regulated by a proportional regulation mode, so that the accuracy of the real load output signal is ensured.
In the examples: as shown in fig. 2, the A, B, C three-phase digital-to-analog conversion circuit includes three digital-to-analog conversion chips 202 and A, B, C two-stage filters 203, which are FPAG programmable gate array chips 201 and A, B, C, where the FPAG programmable gate array chips are connected to the digital voltage generator through an RS232 interface circuit, the FPAG programmable gate array chips send A, B, C three-phase digital voltage signals to the three digital-to-analog conversion chips through SPI serial interfaces, and outputs of the three digital-to-analog conversion chips are connected to A, B, C three-phase power amplifiers through the filters.
As shown in fig. 3: the A, B, C three-phase analog-to-digital conversion circuit comprises three analog-to-digital conversion chips 402 of an FPAG programmable gate array chip 401 and a A, B, C, wherein the three analog-to-digital conversion chips are respectively connected with a A, B, C three-phase standard voltage source, A, B, C three-phase digital voltage signals converted by the analog-to-digital conversion chips are respectively connected with the FPAG programmable gate array chip through SPI serial interfaces, and the FPAG programmable gate array chip is used for connecting A, B, C three-phase digital voltage signals received by the FPAG programmable gate array chip with an A, B, C three-phase digital voltage generator through a DSP digital signal processor and an RS232 interface circuit.
In the embodiment of the multifunctional standard voltage source for detecting the state of the power equipment, the three-phase standard voltage source voltage output is formed by the three-phase digital voltage generator through digital-to-analog conversion and the power amplifier, and different voltage sources can be flexibly adjusted and output by the voltage source according to the state detection requirement of the secondary measuring equipment; the method has the characteristics of stable performance, safety and reliability in use, and can provide accurate, stable and various standard voltage source signals for the state detection of the power secondary measurement equipment.
Claims (4)
1. The multifunctional standard voltage source for detecting the state of the power equipment comprises a digital voltage generator and is characterized in that the digital voltage generator is an A, B, C three-phase digital voltage generator, the A, B, C three-phase digital voltage generator is correspondingly connected with a A, B, C three-phase digital-to-analog conversion circuit, the output of the A, B, C three-phase digital-to-analog conversion circuit is output to an A, B, C three-phase standard voltage source through a corresponding A, B, C three-phase power amplifier, and the output A, B, C three-phase standard voltage source is fed back to the A, B, C three-phase digital voltage generator through a corresponding A, B, C three-phase analog-to-digital conversion circuit and is used for stably controlling the output A, B, C three-phase standard voltage source.
2. The multifunctional standard voltage source for power equipment state detection according to claim 1, wherein the A, B, C three-phase digital voltage generator is a computer with a regulating module having the function of regulating the output A, B, C three-phase different direct current digital voltages and different alternating current digital voltages and frequencies.
3. The multifunctional standard voltage source for detecting the state of the power equipment as claimed in claim 1 or 2, wherein the A, B, C three-phase digital-to-analog conversion circuit comprises an FPAG programmable gate array chip and three digital-to-analog conversion chips and three filters, the FPAG programmable gate array chip is connected with the digital voltage generator through an RS232 interface circuit, the FPAG programmable gate array chip sends the A, B, C three-phase digital voltage signals to the three digital-to-analog conversion chips respectively through the SPI serial interface, and the outputs of the three digital-to-analog conversion chips are connected with the A, B, C three-phase power amplifier respectively through the filters.
4. The multifunctional standard voltage source for detecting the state of the power equipment as claimed in claim 1 or 2, wherein the A, B, C three-phase analog-to-digital conversion circuit comprises an FPAG programmable gate array chip and three analog-to-digital conversion chips, the three analog-to-digital conversion chips are respectively connected with A, B, C three-phase standard voltage sources, A, B, C three-phase digital voltage signals converted by the analog-to-digital conversion chips are respectively connected with the FPAG programmable gate array chip through SPI serial interfaces, and the FPAG programmable gate array chip connects the A, B, C three-phase digital voltage signals received by the DSP digital signal processor with the A, B, C three-phase digital voltage generator through RS232 interface circuits.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116609618A (en) * | 2023-06-20 | 2023-08-18 | 西安兴汇电力科技有限公司 | Method for achieving fault location based on primary and secondary fusion of breaker to obtain traveling wave |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116609618A (en) * | 2023-06-20 | 2023-08-18 | 西安兴汇电力科技有限公司 | Method for achieving fault location based on primary and secondary fusion of breaker to obtain traveling wave |
| CN116609618B (en) * | 2023-06-20 | 2024-05-14 | 西安兴汇电力科技有限公司 | Method for achieving fault location based on primary and secondary fusion of breaker to obtain traveling wave |
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