CN204855583U - Transient state of accurate heavy current rises and flows generating device - Google Patents

Abstract

The utility model discloses a precise high current transient rising current generating device, which comprises an IO input device unit, a microcomputer control unit, a digital signal control processing unit, a D/A converter, an A/D converter, and an output current acquisition unit , a high-power linear current power amplifier unit and a three-phase DC rectifying and filtering power supply for supplying power to the high-power linear current power amplifier unit; the utility model collects and measures transient large current signals through the current acquisition unit, and is converted by A/D The device converts the transient large current signal into a digital signal and transmits it to the digital signal control processing unit, and the amplitude and waveform of the transient large current signal are obtained through the operation and processing of the microcomputer control unit. At the same time, the microcomputer control unit completes the operation calculation and processing of various modes of transient signals, and realizes the output of transient analog signals through the control of the D/A converter by the digital signal control processing unit.

Description

A kind of precise high current transient boost current generating device

technical field

The utility model relates to the technical field of electric power system transient testing, in particular to a precise high-current transient up-current generating device.

Background technique

With the rapid development of my country's smart grid construction, various new electronic current transformers are used more and more in UHV power transmission and transformation systems. These advanced electronic current transformers with working principles and methods will sense and detect the power supply current value of the power grid and supply it to the secondary protection and metering device of the power system. The power system uses electronic current transformers to sense and detect the primary current signal, including the steady-state current signal, transient current signal and various fault current signals of the primary current. The protection and metering equipment on the secondary side of the power system are based on these current signals. The signal completes the fault protection and energy metering of the power system.

Compared with traditional electromagnetic transformers, electronic transformers have many advantages, such as: electronic transformers have no magnetic saturation, wide frequency response range, good transient characteristics, simple insulation structure, and no secondary open or short circuit hidden dangers; Digital signal output; optical cable is used instead of cable in transmission, which fundamentally solves the additional error generated by transformer in the process of current and voltage signal transmission; it is conducive to data sharing in substations; it can meet the needs of higher-level substation automation.

In order to ensure the accuracy of electronic transformers and ensure the safety and stability of the system, these electronic transformers must be tested. However, compared with traditional transformers. Fundamental changes have taken place in the measurement principle, structure and output signal mode of electronic transformers, and the traditional transformer testing methods are not suitable for electronic transformers.

At present, the performance test of the electronic current transformer used on the primary side of the power system is generally given the test current of the measured current transformer manually through the manual adjustment of the step-up transformer, and then the current transformer is manually measured through the multimeter. secondary current. Such testing, on the one hand, will cause excessive human error, making it difficult to guarantee high-precision test results, and bring some safety hazards to testers; on the other hand, it can only test the steady-state value of electronic current transformers, and cannot test electronic current transformers. Various transient characteristic parameters of type current transformer.

Moreover, with the increasing demand for on-site calibration of electronic current transformers in China, it is not only required that the output current of this type of current generator can be continuously adjusted in a wide range from a few amps to thousands of amps, but also in accordance with The national standard outputs the steady-state and transient large current of a given waveform, while ensuring the high precision and high stability of the output current; and in order to meet the needs of field testing, to ensure that this type of power supply is small in size, light in weight and high in reliability. However, there is no precise high-current transient boost current generating device that meets all the above-mentioned requirements.

Utility model content

The purpose of the utility model is to provide a precise high-current transient up-current generating device, which can accurately test the transient characteristics of the electronic current transformer on the primary side of the power system.

The utility model adopts the following technical solutions:

A precise high-current transient rising current generating device, including an IO input device unit, a microcomputer control unit, a digital signal control processing unit, a D/A converter, an A/D converter, an output current acquisition unit, and a high-power linear current A power amplifier unit and a three-phase DC rectified and filtered power supply for supplying power to the high-power linear current power amplifier unit; the IO input device unit is connected to a microcomputer control unit, and the microcomputer control unit is connected to a digital signal control processing unit, The digital signal control processing unit is respectively connected to the input end of the D/A converter and the output end of the A/D converter, and the output end of the D/A converter is connected to the high-power linear current power amplifier The input ends of the units are connected; the output end of the high-power linear current power amplifier unit is connected with the acquisition input end of the output current acquisition unit, and the output port of the output current acquisition unit is connected with the input end of the A/D converter.

The three-phase DC rectifying and filtering power supply is connected to the three-phase input power supply through a three-phase isolation and rectifying transformer, and is output to the three-phase DC rectifying and filtering power supply through isolation and step-down.

The digital signal control processing unit is composed of high-speed DSP and FPGA.

The IO input device unit is composed of an industrial computer, a keyboard, a display, a USB interface and a network port, and the keyboard, the display, the USB interface and the network port are respectively connected to the industrial computer.

The microcomputer control unit is composed of industrial computer, desktop PC, notebook computer and CPU.

The high-power linear current power amplifier unit is used to amplify the transient analog signal converted and output by the digital signal control processing unit through the D/A converter, generate a transient large current and output it to the load, and the output transient The large current signal is collected and measured by the output current acquisition unit and converted into a digital quantity by the A/D converter, and is calculated and controlled by the digital signal control processing unit and the microcomputer control unit to output and display the transient current waveform and amplitude. value.

The microcomputer control unit is used to process the input and output signal instructions of each IO device unit above the keyboard, display, USB port, and network port and run relevant application software tools to generate the transient current digital control signal required by the device, The digital signal control processing unit is controlled to convert and output a corresponding transient analog signal through the D/A converter.

The utility model collects and measures the transient large current signal through the current acquisition unit, converts the transient high current signal into a digital signal by the A/D converter and transmits it to the digital signal control processing unit, and obtains the transient large current signal through the operation and processing of the microcomputer control unit. Amplitude and waveform of current signal. At the same time, the working parameter setting and control operation of the device are completed through the keyboard, display, USB port, network port and other IO equipment units. The microcomputer control unit completes the operation calculation and processing of various transient signals. The control of D/A converter realizes the output of transient analog signal. The precise transient large current waveform generated by the device and generating method of the utility model has small distortion, wide frequency band and fast response. The output state current amplitude and waveform can be displayed on the display screen through the microcomputer control unit in real time, and can be stored in the external storage device through the IO port. A variety of transient signal generation methods are convenient for the comprehensive test of the transient characteristic test of the primary electronic current transformer in the power system.

Description of drawings

Fig. 1 is a structural principle block diagram of the utility model.

Detailed ways

As shown in Figure 1, a precise high-current transient up-current generating device includes an IO input device unit, a microcomputer control unit, a digital signal control processing unit, a D/A converter, an A/D converter, and an output current acquisition unit. , a high-power linear current power amplifier unit and a three-phase DC rectified filter power supply for supplying power to the high-power linear current power amplifier unit; the IO input device unit is connected with a microcomputer control unit, and the microcomputer control unit is connected with a digital signal The control processing unit is connected, and the digital signal control processing unit is respectively connected with the input end of the D/A converter and the output end of the A/D converter, and the output end of the D/A converter is connected with the large The input end of the power linear current power amplifier unit is connected; the output end of the high-power linear current power amplifier unit is connected with the acquisition input end of the output current acquisition unit, and the output port of the output current acquisition unit is connected with the input end of the A/D converter.

The three-phase DC rectifying and filtering power supply is connected to the three-phase input power supply through a three-phase isolation and rectifying transformer, and is output to the three-phase DC rectifying and filtering power supply through isolation and step-down. The digital signal control processing unit is composed of high-speed DSP and FPGA.

The IO input device unit is composed of an industrial computer, a keyboard, a display, a USB interface and a network port, and the keyboard, the display, the USB interface and the network port are respectively connected with the industrial computer. The peripheral IO equipment of the unit mainly completes the parameter setting input of the device of the present invention and the output of test data, graphics and reports. The microcomputer control unit is mainly composed of industrial computer, desktop PC, notebook computer and other CPUs.

The high-power linear current power amplifier unit is used to amplify the transient analog signal converted and output by the digital signal control processing unit through the D/A converter, generate a transient large current and output it to the load, and the output transient large current The signal is collected and measured by the output current acquisition unit and converted into a digital quantity by the A/D converter, and is calculated and controlled by the digital signal control processing unit and the microcomputer control unit to output and display the transient current waveform and amplitude.

The microcomputer control unit is used to process the input and output signal instructions of the IO equipment units such as the keyboard, display, USB port, and network port, and run relevant application software tools to generate the transient current digital control signal required by the device, and control The digital signal control processing unit transforms the output corresponding transient analog signal through the D/A converter.

The operating principle of the precision large current transient boosting device of the present utility model is briefly described as follows:

The utility model completes step-down and isolation of the input power supply by a three-phase isolation rectifier transformer, and outputs the DC power supply to the high-power linear current power amplifier unit through the three-phase DC rectification filter power supply rectification filter, and the high-power linear current power amplifier unit converts the D/A The transient current signal input by the converter is amplified for power, and the transient high current power signal is output to the equipment under test for testing.

The output current acquisition unit in the device is connected to the output of the high-power linear current power amplifier unit to collect and measure transient large current signals. The output current acquisition unit is connected to the A/D converter, and the transient large current signal is converted by the A/D converter. It is converted into a digital signal and transmitted to the digital signal control processing unit, and the amplitude and waveform of the transient high current signal are obtained through the operation and processing of the microcomputer control unit. , network port and other IO device units display output. At the same time, the working parameter setting and control operation of the device are completed through the keyboard, display, USB port, network port and other IO equipment units. The microcomputer control unit completes the operation calculation and processing of various transient signals. The control of D/A converter realizes the output of transient analog signal. The operation, calculation and processing of various modes of transient signals are well-known technologies in the field, and will not be described here one by one with examples.

Claims (7)

1. A transient rising current generating device of precision high current, characterized in that: comprising an IO input device unit, a microcomputer control unit, a digital signal control processing unit, a D/A converter, an A/D converter, and an output current acquisition unit, a high-power linear current power amplifier unit, and a three-phase DC rectified and filtered power supply for supplying power to the high-power linear current power amplifier unit; the IO input device unit is connected to a microcomputer control unit, and the microcomputer control unit is connected to a digital The signal control processing unit is connected, and the digital signal control processing unit is respectively connected with the input end of the D/A converter and the output end of the A/D converter, and the output end of the D/A converter is connected with the output end of the A/D converter. The input terminals of the high-power linear current power amplifier unit are connected; the output terminal of the high-power linear current power amplifier unit is connected with the collection input terminal of the output current collection unit, and the output port of the output current collection unit is connected with the input terminal of the A/D converter. 2. The precise high-current transient boost generator according to claim 1, characterized in that: the three-phase DC rectified and filtered power supply is connected to the three-phase input power supply through a three-phase isolated rectifier transformer, and is output through isolation and step-down Give the three-phase DC rectified and filtered power supply. 3. The precise high-current transient up-current generating device according to claim 2, characterized in that: the digital signal control processing unit is composed of high-speed DSP and FPGA. 4. The transient rising current generating device of precision large current according to claim 3, characterized in that: the IO input device unit is composed of an industrial computer, a keyboard, a display, a USB interface and a network port, and the keyboard, the display , USB interface and Ethernet port are respectively connected with the industrial computer. 5. The precise high-current transient up-current generating device according to claim 4, wherein the microcomputer control unit is composed of an industrial computer, a desktop PC, a notebook computer and a CPU. 6. The precise high-current transient up-current generating device according to claim 5, characterized in that: the high-power linear current power amplifier unit is used to control the digital signal control processing unit through the D/A The transient analog signal output by the converter is amplified, a transient large current is generated and output to the load, and the output transient high current signal is collected and measured by the output current acquisition unit, converted into a digital quantity by the A/D converter, and then converted into a digital quantity by the A/D converter. The digital signal control processing unit and the microcomputer control unit calculate and control, output and display the transient current waveform and amplitude. 7. The transient rising current generating device of precision large current according to claim 6, characterized in that: the microcomputer control unit is used to process each IO device unit above the keyboard, display, USB port, and network port Input and output signal instructions and run related application software tools to generate transient current digital control signals required by the device, control the digital signal control processing unit to convert and output corresponding transient analog signals through the D/A converter.