CN211577315U - Magnetic control type direct-current excitation control system for high-voltage resonance test - Google Patents
Magnetic control type direct-current excitation control system for high-voltage resonance test Download PDFInfo
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- CN211577315U CN211577315U CN201921725874.8U CN201921725874U CN211577315U CN 211577315 U CN211577315 U CN 211577315U CN 201921725874 U CN201921725874 U CN 201921725874U CN 211577315 U CN211577315 U CN 211577315U
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Abstract
The utility model discloses a magnetic control type high-voltage resonance test direct current excitation control system, further, including signal sampling module, signal conditioning module, simulation IO expansion module, digital IO expansion module, CPU module, optic fibre production module, optic fibre receiving module; the output end of the signal sampling module is connected with the input end of the signal conditioning module, the output end of the signal conditioning module is connected with the input end of the analog I/O expansion module, the analog I/O expansion module and the digital I/O expansion module are both connected with the CPU module, the optical fiber generating module is connected with the output end of the digital I/O expansion module, and the input end of the optical fiber receiving module is connected with the output end of the optical fiber generating module. The magnetic control transformer has the advantages of simple structure and low cost, has automatic and accurate tracking and tuning capacity in the whole boosting process, can smoothly and steplessly change the excitation reactance of the magnetic control transformer, and ensures that the excitation reactance of the magnetic control transformer and the sample capacitor are always kept in a parallel resonance state in the boosting process.
Description
Technical Field
The utility model relates to a direct current excitation control field, concretely relates to magnetic control formula high-voltage resonance test direct current excitation control system.
Background
With the continuous development of extra-high voltage engineering, the use number of extra-high voltage equipment is also continuously increased. Before the extra-high voltage equipment is put into operation formally, voltage-withstanding insulation detection tests must be carried out on primary equipment such as a GIS switch, a power transformer and a voltage sensor so as to test the insulation condition of the device and ensure the stable and safe operation of the equipment, and the rapid development of the high-voltage test technology is promoted. The magnetic control type high-voltage resonance test is a high-voltage parallel resonance test system based on a magnetic control type test transformer, adopts the major innovative technology of an electrical theory of combining magnetic control inductance regulation and the test transformer, controls the magnetic flux of an iron core by adding a direct current excitation mode in the alternating current excitation of the test transformer, controls the magnetic saturation degree of the iron core, and regulates the magnetic conductance of a magnetic circuit, thereby controlling the excitation reactance of the iron core. The excitation current of the direct current control loop is adjusted to ensure that the excitation reactance of the magnetic control transformer in the high-voltage test system and the capacitance of the test article generate parallel resonance under the complete power frequency, so that the high voltage is applied to the test article, and the capacity of a test power supply is reduced to the maximum extent.
The key part of the magnetic control type high-voltage resonance test is an excitation adjusting control system of a magnetic control test transformer, and the system is used for effectively adjusting the excitation reactance of the magnetic control transformer in the process of boosting at the low-voltage side, so that the excitation reactance and a test article capacitor are always kept in a parallel resonance state in the whole boosting process. In the prior art, a direct-current excitation control system has the defect of low voltage response speed of a direct-current excitation loop. At present, a direct-current excitation system with automatic tracking and tuning capability in the whole boosting process is urgently needed.
SUMMERY OF THE UTILITY MODEL
To the deficiency of prior art, the utility model provides a magnetic control formula high-voltage resonance test direct current excitation control system.
In order to achieve the above purpose, the technical scheme of the utility model is that:
a magnetic control type high-voltage resonance test direct-current excitation control system further comprises a signal sampling module, a signal conditioning module, an analog I/O expansion module, a digital I/O expansion module, a CPU module, an optical fiber generation module and an optical fiber receiving module;
the signal sampling module is used for receiving an analog signal, and the output end of the signal sampling module is connected with the input end of the signal conditioning module;
the signal conditioning module is used for converting the analog signal received by the signal sampling module into a voltage signal, and the output end of the signal conditioning module is connected with the input end of the analog I/O expansion module;
the analog I/O expansion module and the digital I/O expansion module are both connected with the CPU module, the analog I/O expansion module is used for converting voltage signals into digital signals, and the digital I/O expansion module is used for acquiring and controlling the state of each switching value in the novel magnetic control type high-voltage resonance test system;
the CPU module is used for calculating a conduction angle required by the thyristor, comparing a reference angle provided by a synchronous voltage signal at a terminal voltage side, and sending a trigger pulse signal in a short time;
the optical fiber generating module is connected with the output end of the digital I/O expansion module and is used for sending a trigger pulse signal sent by the CPU to the optical fiber receiving module;
the input end of the optical fiber receiving module is connected with the output end of the optical fiber generating module, and the optical fiber receiving module is used for receiving optical signals and converting the optical signals into electric signals, so that the thyristors are triggered to be conducted, and the direct-current excitation voltage is changed.
The SD memory card is connected with the CPU module, the CPU module carries out primary side reactive power calculation by reading the SD memory card and the sampling data of the required voltage and current buffered in the buffer memory, compares the primary side reactive power calculation with 0 through a set PI regulation program, and calculates to obtain a pulse trigger signal of a corresponding trigger angle according to the terminal voltage synchronous signal.
Compared with the prior art, the utility model, have following advantage:
the magnetic control transformer has the advantages of simple structure, convenience in operation and low cost, has automatic and accurate tracking and tuning capacity in the whole boosting process, can smoothly and steplessly change the excitation reactance of the magnetic control transformer, and ensures that the excitation reactance of the magnetic control transformer and the sample capacitor in the boosting process are always kept in a parallel resonance state.
Drawings
Fig. 1 is a schematic structural diagram of a structure diagram of a magnetic control high-voltage resonance test system applied to the magnetic control type high-voltage resonance test direct-current excitation control system;
FIG. 2 is a schematic diagram of a hardware structure connection of the magnetic control type high-voltage resonance test direct-current excitation control system;
FIG. 3 is a schematic diagram of a software flow of the magnetic control type high-voltage resonance test direct-current excitation control system;
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Examples
The magnetic control high-voltage resonance test system adopted in the embodiment also designs a direct-current excitation control system for the 200kV novel magnetic control high-voltage resonance test system. The structure schematic diagram of the test device is shown in fig. 1, and the system comprises seven main parts, namely an alternating current power supply, a voltage regulator, a novel high-voltage magnetic control test transformer, a direct current excitation control power supply, a partial pressure measurement capacitor and a test article capacitor. The voltage regulator is used for adjusting the input voltage of the high-voltage test device, and the voltage division measuring capacitor has the function of measuring the voltage of the high-voltage output side of the test device. As can be seen from fig. 1, the high-voltage testing system adds four cross-connected dc control windings with the same number of turns on the iron core of the conventional transformer, and adds a dc power supply for excitation. The magnetic saturation of the iron core of the novel magnetic control test transformer is changed by adjusting the direct current excitation control system, so that the magnetic conductivity of the iron core is adjusted to control the excitation reactance of the high-voltage magnetic control test transformer, the excitation reactance of the test device and the capacitance of a test article to be tested are always in a parallel resonance state, and the capacitive power of the capacitance of the test article is completely compensated.
As shown in fig. 2, the magnetic control type high-voltage resonance test direct-current excitation control system mainly comprises a signal sampling module, a signal conditioning module, an analog I/O expansion module, a digital I/O expansion module, a CPU module, an optical fiber generation module and an optical fiber receiving module, wherein the CPU module is further connected with a communication expansion module, a switching power supply module, a liquid crystal display module, an SD memory card and a network interface;
the signal sampling module is used for receiving analog signals, the output end of the signal sampling module is connected with the input end of the signal conditioning module, the signal sampling module respectively collects input and output voltage signals of the measuring voltage regulator and output voltage signals of the testing device through a voltage transformer with a proper model, respectively collects input current signals of the measuring voltage regulator, output current signals of the testing device and direct-current excitation current signals of the magnetic control variable voltage control loop through a current transformer with a proper model, and then transmits the sampled analog signals to the signal conditioning module.
The signal conditioning module is used for converting the analog signal received by the signal sampling module into a voltage signal, and the output end of the signal conditioning module is connected with the input end of the analog I/O expansion module;
the signal conditioning module conditions the current signal and the voltage signal of the signal sampling module through circuits such as amplification, filtering and the like, so that the sampling signal is converted into a standard signal capable of being subjected to A/D conversion.
The analog I/O expansion module and the digital I/O expansion module are both connected with the CPU module, the analog I/O expansion module can be used for inputting external detection signals, then the external detection signals are amplified through the amplification circuit, and then the analog I/O expansion module is converted into A/D conversion data (digital quantity) through the A/D conversion circuit, and each analog signal is converted into a digital signal and stored into the buffer memory. When the CPU module executes the scanning of the ladder diagram program each time, the data stored in the buffer memory is distributed to the relay and the data memory of the CPU module through the bus line to execute the read/write operation.
The digital I/O expansion module is also used for receiving the voltage synchronous signals at the end of the magnetic control transformer, can be used for collecting and controlling the state of each switching value in the novel magnetic control type high-voltage resonance test system, and can control the switching of an alternating current loop and a direct current loop by using a relay. Meanwhile, the terminal voltage signals of the magnetic control transformer are collected through the synchronous signal collecting board and transmitted to the CPU, and a reference phase is provided for thyristor pulse triggering signals generated by the CPU.
The CPU module is used for calculating a conduction angle required by the thyristor, comparing a reference angle provided by a synchronous voltage signal at a terminal voltage side, and sending a trigger pulse signal in a short time; specifically, the CPU module is a CPU chip with the model number of KV-3000. KV-3000 carries out primary side reactive power calculation by reading SD memory card and sampling data of required voltage and current cached in buffer memory, then KV-3000 carries out primary side reactive power calculation, compares with 0 through a set PI regulation program, and carries out next step execution on the calculated pulse trigger signal and command of corresponding trigger angle according to terminal voltage synchronous signal.
The optical fiber generating module is connected with the output end of the digital I/O expansion module and is used for sending a trigger pulse signal sent by the CPU to the optical fiber receiving module; specifically, the optical fiber generation module is an HFBR-1414TZ optical fiber transmitter of AVAGO agilent, and converts the pulse trigger electrical signal generated by the CPU into an optical signal through the transmitter, and then transmits the optical signal to a remote receiving end through an optical fiber.
The input end of the optical fiber receiving module is connected with the output end of the optical fiber generating module, and the optical fiber receiving module is used for receiving optical signals and converting the optical signals into electric signals so as to trigger the conduction of the thyristor and change the direct-current excitation voltage; specifically, the optical fiber receiving module is an HFBR-2412TZ optical fiber receiver with the model of AVAGO Agilent, converts an optical signal into an electric signal again, and transmits the electric signal to a gate pole of a controllable thyristor through a power amplification unit, so that the conduction angle of the thyristor in a rectifying circuit is controlled, and the direct-current excitation voltage of a direct-current excitation loop is changed to tune.
The model of the communication expansion module is KV-L21V, and the communication expansion module can be connected with a computer through an RS-232 interface in KV-L21V so as to transmit data.
The model of the switching power supply module is an S-shaped conventional power supply unit and is used for supplying power to the modules.
The liquid crystal display module carries out man-machine interaction through the liquid crystal display touch screen and is used for displaying voltage and current information of sampling measurement, and people can also issue commands such as starting and stopping through the liquid crystal display touch screen.
As shown in fig. 3, which is a schematic diagram of a software flow of the system of the present application, after the signal control and processing module is powered on and primary side data is collected and calculated, whether a trigger pulse signal needs to be sent to turn on the thyristor is determined by judging whether the reactive power of the primary side is equal to 0, so as to adjust the dc excitation voltage to achieve the tuning purpose. When tuning is needed, the conduction angle needed by the thyristor is calculated through KV-3000, a reference angle is provided through a synchronous voltage signal on the terminal voltage side, a pulse signal is sent to a far end through an optical fiber transmitter and is received and converted into an electric signal through an optical fiber receiver, and then the thyristor is triggered to be conducted, so that the purpose of changing the direct-current excitation voltage is achieved, the magnetic saturation of the magnetic control transformer core is changed, the excitation reactance of the magnetic control transformer is adjusted, and the test system is guaranteed to work in a parallel resonance state all the time.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (2)
1. A magnetic control type direct-current excitation control system for a high-voltage resonance test is characterized in that: the device comprises a signal sampling module, a signal conditioning module, an analog I/O expansion module, a digital I/O expansion module, a CPU module, an optical fiber generation module and an optical fiber receiving module;
the signal sampling module is used for receiving an analog signal, and the output end of the signal sampling module is connected with the input end of the signal conditioning module;
the signal conditioning module is used for converting the analog signal received by the signal sampling module into a voltage signal, and the output end of the signal conditioning module is connected with the input end of the analog I/O expansion module;
the analog I/O expansion module and the digital I/O expansion module are both connected with the CPU module, the analog I/O expansion module is used for converting voltage signals into digital signals, and the digital I/O expansion module is used for acquiring and controlling the state of each switching value in the novel magnetic control type high-voltage resonance test system;
the CPU module is used for calculating a conduction angle required by the thyristor, comparing a reference angle provided by a synchronous voltage signal at a terminal voltage side, and sending a trigger pulse signal in a short time;
the optical fiber generating module is connected with the output end of the digital I/O expansion module and is used for sending a trigger pulse signal sent by the CPU to the optical fiber receiving module;
the input end of the optical fiber receiving module is connected with the output end of the optical fiber generating module, and the optical fiber receiving module is used for receiving optical signals and converting the optical signals into electric signals, so that the thyristors are triggered to be conducted, and the direct-current excitation voltage is changed.
2. The magnetic control type high-voltage resonance test direct-current excitation control system according to claim 1, characterized in that: the system also comprises an SD memory card used for recording sampling data of voltage and current, the SD memory card is connected with the CPU module, the CPU module carries out primary side reactive power calculation by reading the SD memory card and the sampling data of the required voltage and current buffered in the buffer memory, compares the primary side reactive power calculation with 0 through a set PI regulating program, and calculates to obtain a pulse trigger signal of a corresponding trigger angle according to the terminal voltage synchronous signal.
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| CN201921725874.8U CN211577315U (en) | 2019-10-15 | 2019-10-15 | Magnetic control type direct-current excitation control system for high-voltage resonance test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112433130A (en) * | 2020-11-05 | 2021-03-02 | 国网重庆市电力公司电力科学研究院 | Equivalent impedance control-based alternating current withstand voltage test method for electromagnetic voltage transformer |
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2019
- 2019-10-15 CN CN201921725874.8U patent/CN211577315U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112433130A (en) * | 2020-11-05 | 2021-03-02 | 国网重庆市电力公司电力科学研究院 | Equivalent impedance control-based alternating current withstand voltage test method for electromagnetic voltage transformer |
| CN112433130B (en) * | 2020-11-05 | 2023-03-21 | 国网重庆市电力公司电力科学研究院 | Equivalent impedance control-based alternating current withstand voltage test method for electromagnetic voltage transformer |
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