CN207301189U - A kind of Multifunctional coil kind equipment testing synthesis parameter device - Google Patents

Abstract

The utility model discloses a comprehensive parameter testing device for multifunctional coil equipment, which comprises: a main control board; a program-controlled test power supply module and a measurement unit module respectively connected to the main control board, and a display control part; an isolation transformer, and its input terminal Connect with the output terminal of the program-controlled test power module; the main control board controls the program-controlled test power module to output a sine wave test power with continuously adjustable voltage through the serial port and controls the measurement unit module to work in an orderly manner; the sine wave test power is output through the output terminal of the isolation transformer The output end of the isolation transformer is provided with a voltage sensor and a current sensor; the measurement unit module calculates the voltage and current signals collected by the voltage sensor and the current sensor in real time and outputs the calculation result; the display control part receives and displays, prints, Store the calculation result. The utility model has the advantages of reducing the number of test equipment, reducing the labor intensity on site, and making the test work more efficient and reliable.

Description

A comprehensive parameter testing device for multifunctional coil equipment

technical field

The utility model relates to the technical field of power electronics, in particular to a comprehensive parameter testing device for multifunctional coil equipment.

Background technique

Coil equipment (such as various transformers, transformers, etc.) occupies an extremely important position in various equipment in the power system, and its electrical test items are often more and more complicated than other equipment. At present, a set of special test instruments is required for each test of coil equipment in the market, and the test instruments are relatively heavy. Therefore, multiple instruments are often required to complete the test of a device. Restricted by factors such as the site and power supply, it is necessary to repeatedly move the instrument back and forth and repeat the wiring many times in the field work, and the work efficiency is low.

In the prior art, when electrical tests are performed on transformers and power transformers, discrete testing equipment is generally used for testing. The test power is usually regulated by a power control box (voltage regulator). Then cooperate with various meters such as voltmeter, ammeter and power meter for measurement. The power control box is mainly composed of a self-coupling voltage regulator, which usually requires manual adjustment. During the test process, it is necessary to manually adjust the voltage while observing the meter, and record the corresponding measurement results. The requirements for operators are relatively high, and the operation process is relatively cumbersome, which is not conducive to the realization of automatic measurement. With the development of electronic technology, the era of digitalization has ushered in, and the measuring instruments are also developing towards intelligence and digitalization. In the test, the auto voltage regulator is generally used as the test power supply, and the manual operation is basically the main method. During the test, it is necessary to connect the power control box and the measuring meter on site, which is time-consuming and labor-intensive, and the degree of automation is not high.

Through the research on various special test instruments at present, it is found that most of the instruments can be composed of three parts: test power supply, measurement system, control and display man-machine system. Many functional modules can be shared. If the functional modules are organically combined into one instrument, so that one instrument has the function of completing various test items, instead of the traditional discrete instrument test mode, this can reduce the number of test equipment, reduce on-site labor intensity, and make the test The work is more efficient and reliable. Moreover, the degree of automation of the instrument is higher, reducing on-site wiring, and avoiding problems such as inconsistent data report formats of different instruments from different manufacturers.

At present, the research on comprehensive electrical test devices is still relatively rare at home and abroad. Most of the instruments still have a single function, and the formats of the output results of different manufacturers are not uniform, which also causes a lot of trouble for the later data analysis and filing.

Utility model content

The utility model provides a comprehensive parameter testing device for multi-functional coil equipment. Through the integrated design of a digital programmable electronic voltage regulator and a multi-functional measuring meter, the testing device has a highly intelligent and multi-functional measurement. purpose of the device.

In order to achieve the above object, the utility model is realized through the following technical solutions:

A comprehensive parameter testing device for multifunctional coil equipment, comprising: a main control board; a program-controlled test power module and a measurement unit module respectively connected to the main control board, and a display control component; the main control board controls the program-controlled The test power supply module outputs a sine wave test power supply with continuously adjustable voltage, and controls the measurement unit module to perform measurement, and feeds back the calculation results to the display control part; the measurement unit module collects and calculates the test results of the coil equipment to be tested The voltage and current signals at the time, and output the calculation result to the main control board; the display control part displays, prints and stores the calculation result.

Preferably, the main control board is a high-performance digital signal processor, adopting a 32-bit ARM single-chip microcomputer model of BLNT-MCB-11.

Preferably, the test device is further provided with an isolation transformer, the input end of which is connected to the output end of the program-controlled test power supply module; the output end of the isolation transformer outputs a sine wave test power supply.

Preferably, the program-controlled test power supply module further includes: a waveform generator, which generates and continuously outputs a sinusoidal analog signal; a triangular modulation wave generator, which generates and outputs a bidirectional triangular carrier wave; the waveform generator and the triangular modulation wave generator The output end of the SPWM modulation module is connected with the input end of the comparison circuit module; the input end of the SPWM modulation module is connected with the output end of the comparison circuit module; the high-power IPM switch module is connected with the output end of the SPWM modulation module; The rectifier is connected with the high-power IPM switch module; the input end of the low-pass filter is connected with the output end of the high-power IPM switch module.

Preferably, the waveform generator further includes: the pulse generated by the clock generator of the waveform generator drives the counter of the waveform generator, and the counter outputs the address line of the scanning waveform data ROM, and sequentially transfers the ROM The sinusoidally changing data is output to the input terminal of the D/A converter of the waveform generator, and the output terminal of the D/A converter outputs a sinusoidal analog signal.

Preferably, the program-controlled test power supply module is further provided with a digital amplitude modulation circuit, and the D/A converter provided with the digital amplitude modulation circuit receives the sinusoidal analog signal generated by the waveform generator, and the D/A converter is set to The amplitude modulation data is the amplitude modulation of the sinusoidal analog signal, and the amplitude modulated sinusoidal signal is output through the D/A converter.

Preferably, the SPWM modulation module further includes: the SPWM modulation module is further provided with an inverter, a first power drive module and a second power drive module; the input terminal of the inverter and the output terminal of the comparison circuit module connected, the output end of the inverter is connected to the first end of the second power drive module; the second end of the second power drive module is connected to the input end of the high-power IPM switch module; the first power drive The first terminal of the module is connected with the output terminal of the comparison circuit module, and the second terminal is connected with the input terminal of the high-power IPM switch module.

Preferably, the test device is further provided with a voltage sensor and a current sensor arranged between the output end of the isolation transformer and the power output end of the test device.

Preferably, the measurement unit module further comprises:

The voltage filtering and amplifying module and the current filtering and amplifying module respectively filter and amplify the voltage and current signal data collected by the voltage sensor and the current sensor and output them;

A high-speed A/D converter, which converts the analog signals of voltage and current through filtering and amplifying into digital signals of voltage and current, and stores them in the data memory provided by the display control module; calculates voltage, RMS value of current, as well as active power and power factor and output;

In the formula: U _i and I _i are instantaneous sampling values of voltage and current, N is the number of sampling points per cycle, U is the effective value of voltage, I is the effective value of current, P is the active power, is the power factor.

Preferably, the display touch component further includes: a display, a printer, a memory and an online interface; the display displays the measurement results fed back by the main control board, and the printer prints the measurement results; the memory stores the measurement unit The voltage and current results collected and calculated by the module; the online interface is used for online operation.

Compared with the prior art, the utility model has the following advantages:

By using SPWM modulation technology to replace traditional test voltage regulation, automatic voltage regulation is realized, and through the principle of single-chip microcomputer, multiple types of tests are concentrated on a small instrument for measurement and calculation, and finally automatically print reports, saving human calculation work , greatly improving the safety and convenience of on-site operations, and greatly improving the efficiency of on-site operations.

By organically combining the functional modules of the program-controlled test power supply, measurement system, and control and display man-machine system into one instrument, one instrument has the function of completing various test items, replacing the traditional discrete instrument test mode. Reduce the number of test equipment, reduce on-site labor intensity, and make the test work more efficient and reliable. Moreover, the degree of automation of the instrument is higher, reducing on-site wiring, and avoiding problems such as inconsistent data report formats of different instruments from different manufacturers.

The invention includes test functions such as voltage transformer withstand voltage (induction withstand voltage or power frequency withstand voltage), no-load current, volt-ampere characteristics, etc., and can also be used for no-load test, load test and withstand voltage test of transformers. Once the equipment is put into use by various power grid companies and equipment manufacturers, it will directly bring great convenience to the power inspection and maintenance work, effectively ensure the safe operation of the power grid, improve the safety level of the power grid, and avoid major accidents. The direct or indirect economic benefits are huge.

Description of drawings

Fig. 1 is the overall structural block diagram of a kind of multifunctional coil equipment comprehensive parameter testing device of the present invention;

Fig. 2 is the structural block diagram of the waveform generator of the program-controlled test power supply device of a kind of multifunctional coil equipment comprehensive parameter testing device of the utility model;

Fig. 3 is the principle block diagram of the sinusoidal signal digital amplitude modulation circuit that the waveform generator of a kind of program-controlled test power supply device of the present invention sends;

Fig. 4 is the structural block diagram of the program-controlled test power supply device of a kind of multifunctional coil equipment comprehensive parameter testing device of the present invention;

Fig. 5 is the schematic diagram of the program-controlled test power supply SPWM modulation principle of a kind of multifunctional coil type equipment comprehensive parameter testing device of the present invention;

Fig. 6 is a block diagram of the circuit structure of a multifunctional measuring meter circuit of a multifunctional coil type equipment comprehensive parameter testing device of the present invention;

Fig. 7 is a human-computer interaction flow chart of a comprehensive parameter testing device for multifunctional coil equipment of the present invention.

Detailed ways

The utility model will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

As shown in Figure 1, a comprehensive parameter testing device for multifunctional coil type equipment includes: a main control board; a program-controlled test power supply module and a measurement unit module respectively connected to the main control board, and display control components; an isolation transformer, Its input end is connected with the output end of the program-controlled test power supply module; the main control board controls the sine wave test power supply with continuously adjustable output voltage of the program-controlled test power supply module through a serial port. The sine wave test power is output through the output terminal of the isolation transformer.

As shown in Figures 2 to 5, the program-controlled test power supply device further includes: a waveform generator, a triangular modulation wave generator, a comparison circuit module, an SPWM modulation module, a high-power IPM switch module and a low-pass filter.

The output end of the waveform generator and the triangular modulation wave generator is connected to the input end of the comparison circuit module, the output end of the comparison circuit module is connected to the input end of the SPWM modulation module, and the SPWM modulation module The output end is connected to the input end of the high-power IPM switch module, and the output end of the high-power IPM switch module is connected to the input end of the low-pass filter;

The triangular modulation wave generator is used to generate and output a bidirectional triangular carrier wave.

As shown in Figure 2, described waveform generator further comprises: clock generator, counter, waveform data ROM module and D/A converter.

The operating principle of the waveform generator is: the pulse generated by the clock generator of the waveform generator is used to drive the counter of the waveform generator, and the counter output is used to scan the address line of the waveform data ROM, so that The sinusoidally changing data in the ROM is output to the input terminal of the D/A converter of the waveform generator, and the sinusoidal analog signal is output through the output terminal of the D/A converter.

As shown in Figure 3, the program-controlled test power supply device is further provided with a digital amplitude modulation circuit, and the sinusoidal analog signal generated by the waveform generator is input into the D/A converter provided with the amplitude modulation circuit, and the main control machine is set by setting the The amplitude modulation data of the D/A converter realizes the amplitude modulation of the sinusoidal analog signal, and outputs the amplitude modulated sinusoidal signal through the D/A converter.

The program-controlled test power supply module is further equipped with a rectifier that adopts analog-digital-digital-analog conversion to rectify the input 50Hz, 220V AC mains into 300V pure DC voltage without high-frequency and low-frequency voltage defects, and input it to the high-power IPM switch module.

As shown in Figure 4, the amplitude-modulated sinusoidal signal is used as a feedback voltage, and the bidirectional triangular carrier wave is used as a sampling voltage. Through the comparison circuit module, the ratio of the feedback voltage to the sampling voltage is compared to control the duty cycle and output Voltage stabilization signal, the SPWM modulation module receives the voltage stabilization signal, the voltage stabilization signal is divided into two paths, one path is directly output to the first power drive module provided with the SPWM modulation module, and the other path passes through the The signal amplifying circuit module provided in the SPWM modulating module amplifies the stabilized voltage signal and outputs it to the second power driving module provided in the SPWM modulating module.

As shown in Figure 5, the SPWM modulation is performed on the stabilized voltage signal by the first and second power drive modules: that is, the stabilized voltage signal input to the first power drive module is further divided into two references with opposite polarities Sine waves μ _g and -μ _g , the voltage stabilization signal in the second power drive module is a bidirectional triangular carrier μ _c , the power generated by the intersection of the reference sine waves μ _g and -μ _g with the bidirectional triangular carrier μ _c The switch drive signal is modulated; the reference sine wave contains two fundamental waves μ _g and -μ _g . The μ _g fundamental wave intersects with the triangular wave μ _c to generate μ _a and its complementary signal

The -μ fundamental wave intersects with the μ _c fundamental wave and also produces the μ _b signal and Signal. The positive half cycle of negligence voltage μ _o is determined by the AND logic of μ _a and μ _b . When μ _a and μ _b are at high level, make μ _o =μ _d ; when either of μ _a or μ _b is at low level, make μ _o =0.

Because in the positive half cycle, the high level of μ _a is always wider than the low level of μ _b , so that the output voltage μ _o only contains two levels of μ _d and 0.

Similarly, in the negative half cycle the output voltage μ _o is determined by μ _a and Determined by AND logic, it only contains two levels of 0 and -μ _d . μ _d has two state transitions in one carrier cycle.

The signal modulated by the above-mentioned sine wave pulse width modulation technology (SPWM for short) is processed through the power drive circuit, that is, the high-power IPM switch module and the low-pass filter, and is output by the isolation transformer connected with the program-controlled test power supply; Sine wave test power supply with continuously adjustable output voltage.

To sum up, the sine wave test power supply with continuously adjustable voltage is the key part of the device, which outputs a test power supply with continuously adjustable voltage under the control of the main control board. The power supply uses digital waveform synthesis technology and high-power SPWM pulse width modulation technology to realize amplitude modulation power supply output. The control test power supply is a high-power component. In order to protect the safety of the test equipment and the tested product during use, it is designed with various protection functions, such as over-current, over-voltage and over-temperature protection functions. Protection functions are designed in both hardware and software.

A voltage sensor and a current sensor are provided between the output end of the isolation transformer of the test device and the power output end provided by the test device;

The measurement unit module calculates the voltage and current signals collected by the voltage sensor and the current sensor in real time and outputs the calculation result; that is

As shown in Figure 6, the measurement unit is connected to the main control board through a serial interface, which samples and calculates voltage and current signals in real time, and outputs electrical parameters such as voltage, current, active power, power factor and frequency. The single-chip microcomputer adopts a high-performance double 16-bit analog-to-digital converter as a main data acquisition chip, which ensures high precision of measurement. The main control board controls the measurement unit to automatically detect and collect the output current and voltage of the isolation transformer.

The measurement principle adopts synchronous high-speed sampling technology, that is, the voltage and current signals are sampled synchronously through the voltage sensor and current sensor, and the voltage and current data obtained by sampling are respectively filtered and amplified by the voltage filter amplifier module and the current filter amplifier module. Processing and outputting, the voltage and current signals processed by filtering and amplifying are respectively converted into digital signals of voltage and current by a 16-bit high-speed A/D converter; In the data memory provided by the measurement unit module, the sampled data is then calculated according to the electrical engineering principle to calculate the effective value of the voltage and current according to the current and voltage data collected by the measurement unit module according to formulas 1 to 4. , and results such as active power and power factor.

Among them: U _i and I _i are instantaneous sampling values of voltage and current, N is the number of sampling points per cycle, U is the effective value of voltage, I is the effective value of current, P is the active power, is the power factor.

The measurement unit module outputs the calculation results of the electrical parameters to the main control board, and the main control board receives and feeds back the calculation results to the display touch component and the online interface;

The online interface further includes an external memory interface and a communication interface for online operation.

The display control part receives the calculation result information fed back by the main control board, and displays it through the liquid crystal display provided by the display control part, and the operator can read the final test result on the liquid crystal display.

The micro-printer provided in the display control part prints the calculation result and stores it through the non-volatile memory provided in the display control part.

The display touch component sends instructions to control the program-controlled test power supply and the measuring meter to work in an orderly manner to the main control board, and the main control board executes it, so that the comprehensive parameter test device of the multi-functional coil type equipment can be controlled according to User preset functions for automatic measurements.

The main control board is a high-performance digital signal processor, which adopts a 32-bit ARM single-chip microcomputer whose model is BLNT-MCB-11. The core of the main engine is the main control board, which is implemented by a 32-bit ARM single-chip microcomputer. It is mainly responsible for man-machine interface design, frequency conversion power supply control, measurement unit data reading, data result display, printing, storage, communication and other work. All measurement processes are completed under the control of the main control board.

As shown in Figure 7, the display control part is further provided with buttons, and the buttons further include four arrow keys up, down, left and right and a "confirm" key, and the confirm key is used to confirm that the The menu item selected by the direction key, and realize the corresponding function shown in the menu item; control the measurement unit module and the program-controlled test power module according to the feedback of the button, and feedback the result to the operator through sound, such as a buzzer, and an image. Move the current cursor state or change the value of the selected position; for example, the magnitude of the applied voltage value is to select a certain test content in multiple menus or to change the value of a selected position; when the key is a confirmation key, according to The different contents pointed by the cursor are processed differently, for example, enter the corresponding menu when selecting the menu, and realize the corresponding function when it is the function menu.

Although the content of the present invention has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions of the present utility model will be obvious to those skilled in the art after reading the above content. Therefore, the protection scope of the present utility model should be defined by the appended claims.

Claims (10)

1. A comprehensive parameter testing device for multifunctional coil type equipment, characterized in that it comprises: The main control board; the program-controlled test power supply module and the measurement unit module respectively connected to the main control board, and the display control part; The main control board controls the sine wave test power supply with continuously adjustable output voltage of the program-controlled test power module, controls the measurement unit module to perform measurement, and feeds back the calculation result to the display control part; The measurement unit module collects and calculates the voltage and current signals during the test of the coil-like equipment to be tested, and outputs the calculation results to the main control board; The display control part displays, prints, and stores the calculation results. 2. a kind of multifunctional coil type equipment comprehensive parameter testing device as claimed in claim 1, is characterized in that, described main control board is a high-performance digital signal processor, adopts the 32-bit ARM single-chip microcomputer that model is BLNT-MCB-11 . 3. a kind of multifunctional coil type equipment comprehensive parameter testing device as claimed in claim 2, is characterized in that, described testing device is further provided with isolation transformer, and its input end is connected with the output end of described program-controlled test power supply module; The output terminal of the above-mentioned isolation transformer outputs a sine wave test power supply. 4. A kind of multifunctional coil type equipment comprehensive parameter testing device as claimed in claim 1, is characterized in that, described program-controlled test power supply module further comprises: a waveform generator that generates and continuously outputs a sinusoidal analog signal; A triangular modulation wave generator, which generates and outputs a bidirectional triangular carrier wave; The output end of the waveform generator and the triangular modulation wave generator is connected with the input end of the comparison circuit module; the SPWM modulation module, its input end is connected with the output end of the comparison circuit module; High-power IPM switch module, its input end is connected with the output end of described SPWM modulation module; a rectifier connected to a high-power IPM switch module; A low-pass filter, whose input end is connected with the output end of the high-power IPM switch module. 5. a kind of multifunctional coil type equipment comprehensive parameter testing device as claimed in claim 4, is characterized in that, described waveform generator further comprises: The pulse generated by the clock generator of the waveform generator drives the counter of the waveform generator, and the counter outputs the address line of the scan waveform data ROM, and sequentially outputs the sinusoidally changing data in the ROM to the waveform generator The input terminal of the D/A converter of the device, and the output terminal of the D/A converter outputs a sinusoidal analog signal. 6. A kind of multifunctional coil type equipment comprehensive parameter testing device as claimed in claim 5, is characterized in that, described program-controlled test power supply device is further provided with digital amplitude modulation circuit: The D/A converter provided with the digital amplitude modulation circuit receives the sinusoidal analog signal generated by the waveform generator, sets the amplitude modulation data of the D/A converter, modulates the amplitude of the sinusoidal analog signal, and passes the The D/A converter outputs the sinusoidal signal after amplitude modulation. 7. a kind of multifunctional coil type equipment comprehensive parameter testing device as claimed in claim 4, is characterized in that, described SPWM modulation module further comprises: described SPWM modulation module is further provided with inverter, the first power drive module and The second power drive module; the input end of the inverter is connected to the output end of the comparison circuit module, and the output end of the inverter is connected to the first end of the second power drive module; the second power drive module The second end of the first power drive module is connected to the input end of the high-power IPM switch module; the first end of the first power drive module is connected to the output end of the comparison circuit module, and its second end is connected to the input end of the high-power IPM switch module. 8. A kind of comprehensive parameter testing device of multifunctional coil type equipment as claimed in claim 3, is characterized in that, described testing device is further provided with and is arranged on the output end of described isolation transformer and the power supply output end of described testing device. Between the voltage sensor and the current sensor. 9. A kind of multifunctional coil type equipment comprehensive parameter testing device as claimed in claim 1, is characterized in that, described measurement unit module further comprises: The voltage filtering and amplifying module and the current filtering and amplifying module respectively filter and amplify the voltage and current signal data collected by the voltage sensor and the current sensor and output them; A high-speed A/D converter, which converts the filtered and amplified analog signals of voltage and current into digital signals of voltage and current, and stores them in the data memory provided by the display control module; Calculate and output the effective value of voltage and current, as well as active power and power factor; In the formula: U _i and I _i are instantaneous sampling values of voltage and current, N is the number of sampling points per cycle, U is the effective value of voltage, I is the effective value of current, P is the active power, is the power factor. 10. A kind of multifunctional coil type equipment comprehensive parameter testing device as claimed in claim 1, is characterized in that, The display touch component further includes: a display, a printer, a memory and an online interface; The display shows the measurement results fed back by the main control board, the printer prints the measurement results; The memory stores the voltage and current results collected and calculated by the measurement unit module; The online interface is used for online operation.