阅读说明：本技术 基于无线控制技术的便携式10kV隔离开关交流耐压试验装置 (Portable 10kV isolating switch alternating current withstand voltage test device based on wireless control technology ) 是由 李佳奇 鲁旭臣 罗星岩 刘碧琦 罗斌 李爽 汤晓中 王利民 包蕊 王南 耿莉娜 于 2019-11-14 设计创作，主要内容包括：本发明属于高压电气试验技术领域,尤其涉及基于无线控制技术的便携式10kV隔离开关交流耐压试验装置。本发明电池模块与SPWM调制变频电源模块通过电缆相连,SPWM调制变频电源模块与励磁变压器模块通过电缆相连；励磁变压器模块一端接地,另一端与电抗器模块输入端串连；电抗器模块输出端同时和电容式分压器模块高压臂输入端、被试隔离开关输入端相连；分压器模块接地端接地,被试隔离开关接地端接地；分压器模块低压臂将信号反馈到变频电源模块；引出电缆电容为电缆的对地电容；SPWM调制变频电源模块以无线通信方式与手持式无线控制器连接；各模块各自独立,集成于试验箱中。本发明有效克服了在交流耐压试验现场难以供电的问题。(The invention belongs to the technical field of high-voltage electrical tests, and particularly relates to a portable 10kV isolating switch alternating-current withstand voltage test device based on a wireless control technology. The battery module is connected with the SPWM modulation variable frequency power supply module through a cable, and the SPWM modulation variable frequency power supply module is connected with the excitation transformer module through a cable; one end of the excitation transformer module is grounded, and the other end of the excitation transformer module is connected with the input end of the reactor module in series; the output end of the reactor module is simultaneously connected with the input end of the high-voltage arm of the capacitive voltage divider module and the input end of the tested isolating switch; the grounding end of the voltage divider module is grounded, and the grounding end of the tested isolating switch is grounded; the low-voltage arm of the voltage divider module feeds back a signal to the variable-frequency power supply module; the outgoing cable capacitor is the ground capacitor of the cable; the SPWM modulation variable frequency power supply module is connected with the handheld wireless controller in a wireless communication mode; each module is independent and integrated in the test box. The invention effectively solves the problem of difficult power supply on the AC voltage withstand test site.)

1. Portable 10kV isolator exchanges withstand voltage test device based on wireless control technique, characterized by: the battery module (1) is connected with the SPWM modulation variable frequency power supply module (2) through a cable, and the SPWM modulation variable frequency power supply module (2) is connected with the exciting transformer module (3) through a cable; one end of the secondary output end of the exciting transformer module (3) is grounded, and the other end of the secondary output end of the exciting transformer module is connected with the input end of the reactor module (4) in series; the output end of the reactor module (4) is simultaneously connected with the input end of a high-voltage arm of the capacitive voltage divider module (5) and the input end of the tested isolating switch (7); the grounding end of the voltage divider module (5) is grounded, and the grounding end of the tested isolating switch (7) is grounded; the outgoing cable capacitor (6) is a ground capacitor; the SPWM modulation variable frequency power supply module (2) is connected with a handheld wireless controller (8) in a wireless communication mode; the modules are independent and integrated in the test box.

2. The portable 10kV disconnecting switch alternating-current withstand voltage test device based on the wireless control technology as claimed in claim 1, wherein: the battery module (1) is a 48V lithium battery, and the 48V lithium battery module provides a working power supply for the whole machine.

3. The portable 10kV disconnecting switch alternating-current withstand voltage test device based on the wireless control technology as claimed in claim 1, wherein: SPWM modulation variable frequency power supply module (2) possesses 2.4G wireless communication function, provides different alternating current sinusoidal voltage and frequency output, produces the resonance under the frequency that satisfies the following equation in order to realize high-voltage output, feeds back the voltage Ux and the frequency value of present article under test (7) to hand-held type wireless controller (8) simultaneously to show in real time on liquid crystal module (11):

in the above formula: f is resonance frequency, pi is 3.1415926, L is capacitance of the reactor module, C is capacitance divider module, and capacitance of the lead-out cable and the tested object are added.

4. The portable 10kV disconnecting switch alternating-current withstand voltage test device based on the wireless control technology as claimed in claim 1, wherein: the SPWM modulation variable frequency power supply module (2) is boosted and isolated through the exciting transformer module (3), the secondary output end of the exciting transformer module (3) is connected in series through the reactor module (4) and is connected in parallel with the lead-out capacitive voltage divider module (5), the cable capacitor (6) and the tested isolating switch (7), and series resonance is realized under proper power supply frequency.

5. The portable 10kV disconnecting switch alternating-current withstand voltage test device based on the wireless control technology as claimed in claim 1, wherein: the reactor module (4) is cast by vacuum epoxy without a yoke.

6. The portable 10kV disconnecting switch alternating-current withstand voltage test device based on the wireless control technology as claimed in claim 1, wherein: the SPWM modulation variable frequency power supply module (2) is connected with a serial port of a CPU module (15) through a wireless transceiver module (9), and an input control module (10) and a liquid crystal module (11) are connected with a common IO port of the CPU module (15); the voltage sampling (12) and the current sampling (13) are connected with an AD conversion port of the CPU module (15); the overcurrent protection (14) is connected with an interrupt input port of the CPU module (15); the driving module (16) is connected with a PWM output port of the CPU module (15); the electronic switch (17) is connected with the driving module (16); the filtering module (18) is connected with the electronic switch (17); the modules are integrated on a circuit board and connected by printed circuit strips.

7. The portable 10kV disconnecting switch alternating-current withstand voltage test device based on the wireless control technology as claimed in claim 6, wherein: the wireless transceiver module (9) adopts a short-range wireless communication module based on a 2.4G wireless technology; the input control module (10) adopts an EC11 type 20-bit pulse input control module with a switch; the liquid crystal module (11) is composed of large-screen dot matrix liquid crystal, and simultaneously displays output voltage and output frequency.

8. The portable 10kV disconnecting switch alternating-current withstand voltage test device based on the wireless control technology as claimed in claim 6, wherein: the voltage sampling module (12) acquires a signal after the voltage Ux of the tested object is attenuated from the low-voltage signal output of the capacitive voltage divider module (5), is connected with an AD conversion port of the CPU module (15), calculates the value of the actually output tested isolating switch power supply Ux according to the actual attenuation ratio of the capacitive voltage divider module (5), and displays the value on the liquid crystal module (11).

9. The portable 10kV disconnecting switch alternating-current withstand voltage test device based on the wireless control technology as claimed in claim 6, wherein: the current sampling (13) and the overcurrent protection (14) simultaneously monitor the current of the primary coil of the exciting transformer module (3), are connected with an AD conversion port of the CPU module (15), test the current value of the primary coil of the exciting transformer and display the current value on the liquid crystal module (11); once the current exceeds a set threshold value, the overcurrent protection module acts to trigger the interrupt input of the CPU module (15), and the system is stopped immediately;

the CPU module (15) performs operation and processing on each input data; and the voltage Ux on the tested object is a stable sinusoidal voltage in a closed-loop control mode;

the driving module (16) is composed of two IR2110 type MOS full-bridge driving chips to realize power conversion;

the electronic switch (17) is composed of 4 groups of low internal resistance N-channel MOS arrays, the MOS arrays form a bridge type driving circuit, and each group of MOS arrays is formed by connecting a plurality of MOS in parallel;

the filtering module (18) is a low-pass filtering circuit formed by connecting a high-power Fe-Si-Al inductor and a high-voltage capacitor in parallel.

10. A portable 10kV isolating switch alternating-current withstand voltage test method based on a wireless control technology is characterized by comprising the following steps: the method comprises the following steps:

when the AC voltage withstand test is carried out on the tested object, the test is carried out according to the relative ground or the shell;

firstly, connecting a leading-out cable to an isolating switch to be tested, turning on a system power supply, modulating an initial voltage output by a variable frequency power supply module through an SPWM (sinusoidal pulse width modulation), and adding the initial voltage to a tested article through an exciting transformer;

changing the output frequency value through the change rate of O.1Hz to meet the requirement of searching the series resonance frequency of the system by changing different frequencies;

after the resonant frequency is searched, boosting is carried out in two selection modes, namely an automatic boosting mode and a manual boosting mode; after the voltage rises to the rated test voltage 42kV of the tested object, starting a voltage tracking mode until the test is finished; and if the insulation performance of the tested product does not meet the requirement and the test is interrupted due to insulation flashover, judging the interruption reason of the test and recording the interruption reason.

Technical Field

The invention belongs to the technical field of high-voltage electrical tests, and particularly relates to a portable 10kV isolating switch alternating-current withstand voltage test device based on a wireless control technology.

Background

With the continuous development of economic society of China and the great progress of key technologies of smart power grids, the increasing demand of electric power energy puts higher requirements on strong, reliable and smart power grids. The test work of the electrical equipment is the premise of ensuring the safe operation of the electrical equipment and is the most basic and important work in ensuring the safe operation of the electrical equipment. And the alternating current withstand voltage test is the most important ring in the electrical test work. The device applies a certain voltage to electrical equipment such as a high-voltage transformer, a high-voltage switch and the like, and keeps the voltage for a certain time to test the insulation level and the overvoltage bearing capacity of the high-voltage electrical equipment, so that the safe operation of the ultrahigh-voltage electrical equipment is ensured.

At present, a common field high-voltage electrical equipment alternating-current voltage withstand test device in China mainly performs equipment test on high-voltage equipment in a 66kV-500kV transformer substation, if the alternating-current voltage withstand test device with the voltage class is adopted to perform voltage withstand test on 10kV medium-voltage distribution network equipment, particularly the alternating-current voltage withstand test of equipment such as a high-voltage isolating switch on a 10kV distribution network field column, the problems that on-site power supply is difficult to obtain, corresponding units cannot be selected according to the capacity of the specific tested distribution network equipment, the equipment is heavy, a crane is required to install, the carrying is inconvenient, the safety is low and the like.

At present, a portable 10kV isolating switch alternating-current withstand voltage test device based on a wireless control technology is not available in China.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a portable 10kV isolating switch alternating-current withstand voltage test device based on a wireless control technology. The alternating-current voltage withstand test device aims to solve the problems that on-site power supply taking difficulty exists in an alternating-current voltage withstand test of equipment such as a 10kV distribution network line on-site high-voltage isolating switch, corresponding units cannot be selected according to the capacity of the specific tested distribution network equipment, the equipment is heavy, needs a crane to be installed, and is inconvenient to carry, low in safety and the like.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a battery module is connected with an SPWM modulation variable frequency power supply module through a cable, and the SPWM modulation variable frequency power supply module is connected with an excitation transformer module through a cable; one end of the secondary output end of the exciting transformer module is grounded, and the other end of the secondary output end of the exciting transformer module is connected with the input end of the reactor module in series; the output end of the reactor module is simultaneously connected with the input end of a high-voltage arm of the capacitive voltage divider module and the input end of the tested isolating switch; the grounding end of the voltage divider module is grounded, and the grounding end of the tested isolating switch is grounded; the low-voltage arm of the voltage divider module feeds back a signal to the variable-frequency power supply module; the outgoing cable capacitor is the ground capacitor of the cable; the SPWM modulation variable frequency power supply module is connected with the handheld wireless controller in a wireless communication mode; the modules are independent and integrated in the test box.

The battery module is a 48V lithium battery, and the 48V lithium battery module provides a working power supply for the whole machine.

SPWM modulation variable frequency power supply module possesses 2.4G wireless communication function, provides different alternating current sinusoidal voltage and frequency output, produces the resonance in order to realize high-voltage output under the frequency that satisfies the following formula, feeds back handheld wireless controller with current isolator's voltage Ux and frequency value to be tried to simultaneously to show on the liquid crystal module in real time:

in the above formula: f is resonance frequency, pi is 3.1415926, L is capacitance of the reactor module, C is capacitance divider module, and capacitance of the outgoing cable and the tested isolating switch are added.

The SPWM modulation variable frequency power supply module is boosted and isolated through the exciting transformer module, the secondary output end of the exciting transformer module is connected in series through the reactor module and is connected in parallel with the lead-out capacitive voltage divider module, the cable capacitor and the tested isolating switch, and series resonance is realized under a proper power supply frequency.

The reactor module is cast by vacuum epoxy without yoke.

The SPWM modulation variable frequency power supply module is connected with a serial port of the CPU module through a wireless transceiver module, and the input control module and the liquid crystal module are connected with a common IO port of the CPU module; the voltage sampling and the current sampling are connected with an AD conversion port of the CPU module; the overcurrent protection is connected with an interrupt input port of the CPU module; the driving module is connected with a PWM output port of the CPU module; the electronic switch is connected with the driving module; the filtering module is connected with the electronic switch; the modules are integrated on a circuit board and connected by printed circuit strips.

The wireless transceiver module adopts a short-range wireless communication module based on a 2.4G wireless technology; the input control module adopts an EC11 type 20-bit pulse input control module with a switch; the liquid crystal module is composed of large-screen dot matrix liquid crystal, and simultaneously displays output voltage and output frequency.

The voltage sampling is acquired from the low-voltage signal output of the capacitive voltage divider module to obtain a signal after the voltage Ux of the tested isolating switch is attenuated, the signal is connected with an AD conversion port of the CPU module, the actual value of the power Ux of the tested isolating switch is calculated according to the actual attenuation ratio of the capacitive voltage divider module, and the actual value is displayed on the liquid crystal module.

The current sampling and overcurrent protection monitor the current of the primary coil of the exciting transformer module at the same time, and the current sampling and overcurrent protection monitor is connected with an AD conversion port of the CPU module, so that the current value of the primary coil of the exciting transformer is tested and displayed on the liquid crystal module; once the current exceeds a set threshold, the overcurrent protection module acts to trigger the interrupt input of the CPU module, and the system is immediately stopped;

the CPU module is used for calculating and processing each input data; and the voltage Ux on the tested isolating switch is a stable sinusoidal voltage in a closed-loop control mode;

the driving module is composed of two IR2110 type MOS full-bridge driving chips to realize power conversion;

the electronic switch is composed of 4 groups of low internal resistance N-channel MOS arrays, the MOS arrays form a bridge type driving circuit, and each group of MOS arrays is formed by connecting a plurality of MOS in parallel;

the filtering module is a low-pass filtering circuit formed by connecting a high-power Fe-Si-Al inductor and a high-voltage capacitor in parallel.

A portable 10kV isolating switch alternating-current withstand voltage test method based on a wireless control technology comprises the following steps:

when the alternating-current voltage withstand test is carried out on the tested isolating switch, the alternating-current voltage withstand test is carried out according to the relative ground or the shell;

firstly, connecting a leading-out cable to an isolating switch to be tested, turning on a system power supply, modulating an initial voltage by an SPWM (sinusoidal pulse width modulation) variable frequency power supply module, and adding the initial voltage to the isolating switch to be tested by an exciting transformer;

changing the output frequency value through the change rate of O.1Hz to meet the requirement of searching the series resonance frequency of the system by changing different frequencies;

after the resonant frequency is searched, boosting is carried out in two selection modes, namely an automatic boosting mode and a manual boosting mode; after the voltage rises to 42kV of rated test voltage of the tested isolating switch, starting a voltage tracking mode until the test is finished; and if the insulation performance of the tested isolating switch does not meet the requirement and the test is interrupted due to insulation flashover, judging the interruption reason of the test and recording the interruption reason.

Compared with the prior art, the invention has the advantages and beneficial effects that:

(1) the invention can effectively solve the problem of difficulty in getting power supply on site in the alternating current withstand voltage test of equipment such as a high-voltage isolating switch on a 10kV distribution network site column.

(2) Corresponding units are selected according to the specific tested distribution network equipment capacity, the device size is effectively reduced, and the problems that the equipment is heavy, needs a crane for installation and is inconvenient to carry are solved.

(3) The safety of the operating personnel is effectively guaranteed by adopting a wireless control technology.

(4) The self capacitance of the leading-out cable is skillfully utilized to replace the traditional resonance capacitor, the volume of the whole machine is reduced, and the device has wide application value in the power test industry.

Drawings

In order to facilitate the understanding and practice of the present invention for those of ordinary skill in the art, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and the detailed description, the following examples are provided to illustrate the present invention, but it should be understood that the scope of the present invention is not limited by the detailed description.

FIG. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a structural block diagram of an SPWM modulation variable frequency power supply module in the present invention.

In the figure: a battery module 1; SPWM modulation variable frequency power supply module 2; an excitation transformer module 3; a reactor module 4; a capacitive voltage divider module 5; leading out a cable capacitor 6; a tested isolating switch 7; a handheld wireless controller 8; a wireless transceiver module 9; an input control module 10; a liquid crystal module 11; voltage sampling 12; current sampling 13; overcurrent protection 14; a CPU module 15; a drive module 16; an electronic switch 17; a filtering module 18.

Detailed Description

The invention discloses a portable 10kV isolating switch alternating-current withstand voltage test device based on a wireless control technology, which is shown in figure 1, wherein figure 1 is a schematic diagram of the overall structure of the invention. The battery module 1 is connected with the SPWM modulation variable frequency power supply module 2 through two cables; the battery module 1 is a 48V lithium battery. The SPWM modulation variable frequency power supply module 2 is connected with the exciting transformer module 3 through two cables, one end of the output end of the exciting transformer module 3 is grounded, the other end of the output end of the exciting transformer module 3 is connected with the input end of the reactor module 4 in series through a conducting wire, the output end of the reactor module 4 is connected with the input end of a high-voltage arm of the capacitive voltage divider module 5 and the input end of a tested isolating switch 7 through an outgoing cable; the outgoing cable capacitor 6 is a capacitance to ground existing in the outgoing cable itself. The self capacitance of the leading-out cable is skillfully utilized to replace the traditional resonance capacitor, the volume of the whole machine is reduced, and the device has wide application value in the power test industry. The ground terminal of the voltage divider module 5 is grounded, and the shell or the ground terminal of the tested isolating switch 7 is grounded. The SPWM modulation variable frequency power supply module 2 is connected with the handheld wireless controller 8 in a wireless communication mode, safety of operators is improved, and the SPWM modulation variable frequency power supply module has wide application value in the power test industry. The modules are independent, and are reasonably combined according to different capacities of test equipment during use and integrated in a portable test box. Corresponding units can be selected according to the specific capacity of the tested distribution network equipment, the size of the device is effectively reduced, and the problems that the equipment is heavy, needs a crane for installation and is inconvenient to carry are solved.

The output of the SPWM modulation variable frequency power supply module 2 is pure sine wave, and the SPWM modulation variable frequency power supply module has the advantages of smooth waveform and low harmonic component after low-pass filtering.