阅读说明：本技术 高电位电流检测装置和链式变流系统 (High potential current detection device and chain type current transformation system ) 是由 辛文成 陈浩敏 姚森敬 席禹 张凡 敖榜 于 2020-12-17 设计创作，主要内容包括：本申请涉及一种高电位电流监测装置和链式变流系统。该高电位电流监测装置,包括依次连接的高电位取能模块、电源模块、电流传感器、信号处理模块和信号传输模块。高电位取能模块连接前级电路,用于获取前级电路的高电位电能；电源模块用于接收高电位取能模块输出的交流电,进行整流后得到直流电并输出；电流传感器用于采集电源模块输出的直流电,得到电流采样信号并输送至信号处理模块；信号处理模块用于将电流采样信号经过处理后通过信号传输模块输出至控制器。由于使用电流传感器对经过电源模块处理后输出的直流电进行实时检测,得益于电流传感器灵敏度高、响应时间快和抗干扰能力强的优点,可以提高响应速度,提升电流检测的实时性。(The application relates to a high potential current monitoring device and a chain type converter system. The high-potential current monitoring device comprises a high-potential energy-taking module, a power supply module, a current sensor, a signal processing module and a signal transmission module which are sequentially connected. The high-potential energy-taking module is connected with the preceding-stage circuit and is used for obtaining high-potential electric energy of the preceding-stage circuit; the power supply module is used for receiving the alternating current output by the high-potential energy-taking module, rectifying the alternating current to obtain direct current and outputting the direct current; the current sensor is used for collecting direct current output by the power supply module to obtain a current sampling signal and transmitting the current sampling signal to the signal processing module; the signal processing module is used for outputting the current sampling signal to the controller through the signal transmission module after the current sampling signal is processed. Because the current sensor is used for detecting the direct current output after being processed by the power module in real time, the current sensor has the advantages of high sensitivity, quick response time and strong anti-interference capability, the response speed can be increased, and the real-time performance of current detection is improved.)

1. A high potential current detection device is characterized by comprising a high potential energy-taking module, a power supply module, a current sensor, a signal processing module and a signal transmission module which are sequentially connected; the high-potential energy-taking module is used for connecting a preceding stage circuit, and the signal transmission module is used for connecting a controller;

the high-potential energy-taking module is used for obtaining high-potential electric energy of the preceding stage circuit; the power supply module is used for receiving the alternating current output by the high-potential energy-taking module, rectifying the alternating current to obtain direct current and outputting the direct current; the current sensor is used for collecting the direct current output by the power supply module to obtain a current sampling signal and transmitting the current sampling signal to the signal processing module; the signal processing module is used for outputting the current sampling signal to the controller through the signal transmission module after the current sampling signal is processed.

2. The high-potential current detection device according to claim 1, wherein the high-potential energy-taking module comprises an energy-taking unit and a conversion unit; the energy taking unit is connected with the front stage circuit, and the conversion unit is connected with the energy taking unit and the power supply module.

3. The high potential current detection device of claim 1, wherein the power module is connected to the signal processing module for supplying power to the signal processing module.

4. The high-potential current detection device according to claim 3, wherein the power supply module comprises a rectifying unit and a filtering unit; the rectifying unit is connected with the high-potential energy-taking module, and the filtering unit is connected with the rectifying unit, the current sensor and the signal processing module.

5. The high potential current detection device according to claim 3, wherein the signal processing module comprises a signal acquisition unit and a signal processing unit; the signal acquisition unit and the signal processing unit are respectively connected with the power supply module; the signal acquisition unit is connected with the current sensor, and the signal processing unit is connected with the signal acquisition unit and the signal transmission module.

6. The high potential current detecting device according to claim 5, wherein the signal processing unit comprises an encoding and decoding component and a signal converting component; the coding and decoding assembly is connected with the power supply module, the signal acquisition unit and the signal conversion assembly, and the signal conversion assembly is connected with the signal transmission module.

7. The apparatus according to claim 6, wherein the signal transmission module is a transmission fiber, and the signal conversion module is an optoelectronic signal converter.

8. The high potential current detection device of claim 6, wherein the encoding and decoding component is a DSP chip, an ARM chip, an MCU chip, an FPGA chip or a CPLD chip.

9. The high potential current detection device according to any one of claims 6 to 8, wherein the encoding and decoding component is further configured to be connected to a subsequent circuit, and decode the control signal sent by the controller and send the decoded control signal to the subsequent circuit.

10. A chain-link converter system comprising a controller, a plurality of sequentially connected link modules and a high potential current detection device as claimed in any one of claims 1 to 9, the controller connecting the link modules and the high potential current detection device; the high-potential current real-time detection device is connected and arranged between the preceding stage circuit and the first chain link module.

Technical Field

The application relates to the technical field of power system detection, in particular to a high-potential current detection device and a chain type current transformation system.

Background

With the rapid development of economy and continuous progress of the technology level in China, the construction of the power grid is also unprecedented. In order to ensure stable operation of the power grid, the state of the power grid needs to be monitored in real time. The power transmission and distribution are important links in the operation of the power grid, play an extremely important role in the whole operation process of the power grid, and once a fault occurs, inestimable loss is caused. Therefore, it is important to monitor the high-potential current of the power transmission and distribution line in real time during the monitoring process of the power grid state.

Traditional high potential current detection device utilizes current transformer to carry out current measurement, and the rethread low tension cable is direct with the analog signal transmission who records for the controller. The current transformer has better insulating property and can directly transmit a high-voltage current signal to the controller through the low-voltage cable. However, the response speed of the current transformer is limited, which causes a delay in the current monitoring result obtained by the controller, and thus cannot meet the requirement of high-precision control.

Therefore, the conventional high-potential current detection device has the disadvantage of poor real-time current detection.

Disclosure of Invention

In view of the above, it is necessary to provide a high potential current detection device and a chain-type converter system having a good current detection real-time performance.

A high potential current detection device comprises a high potential energy-taking module, a power supply module, a current sensor, a signal processing module and a signal transmission module which are connected in sequence; the high-potential energy-taking module is used for connecting a preceding stage circuit, and the signal transmission module is used for connecting a controller;

the high-potential energy-taking module is used for obtaining high-potential electric energy of the preceding stage circuit; the power supply module is used for receiving the alternating current output by the high-potential energy-taking module, rectifying the alternating current to obtain direct current and outputting the direct current; the current sensor is used for collecting the direct current output by the power supply module to obtain a current sampling signal and transmitting the current sampling signal to the signal processing module; the signal processing module is used for outputting the current sampling signal to the controller through the signal transmission module after the current sampling signal is processed.

In one embodiment, the high-potential energy-taking module comprises an energy-taking unit and a conversion unit; the energy taking unit is connected with the front stage circuit, and the conversion unit is connected with the energy taking unit and the power supply module.

In one embodiment, the power module is connected to the signal processing module for supplying power to the signal processing module.

In one embodiment, the power supply module comprises a rectifying unit and a filtering unit; the rectifying unit is connected with the high-potential energy-taking module, and the filtering unit is connected with the rectifying unit, the current sensor and the signal processing module.

In one embodiment, the signal processing module comprises a signal acquisition unit and a signal processing unit; the signal acquisition unit and the signal processing unit are respectively connected with the power supply module; the signal acquisition unit is connected with the current sensor, and the signal processing unit is connected with the signal acquisition unit and the signal transmission module.

In one embodiment, the signal processing unit comprises an encoding and decoding component and a signal conversion component; the coding and decoding assembly is connected with the power supply module, the signal acquisition unit and the signal conversion assembly, and the signal conversion assembly is connected with the signal transmission module.

In one embodiment, the signal transmission module is a transmission optical fiber, and the signal conversion component is an optical-electrical signal converter.

In one embodiment, the encoding and decoding component is a DSP (Digital Signal Processing) chip, an ARM chip, an MCU (micro controller Unit) chip, an FPGA (Field Programmable Gate Array) chip, or a CPLD (Complex Programmable logic device) chip.

In one embodiment, the encoding and decoding component is further configured to be connected to a subsequent circuit, and decode the control signal sent by the controller and send the decoded control signal to the subsequent circuit.

A chain type converter system comprises a controller, a plurality of chain link modules and the high potential current detection device, wherein the chain link modules and the high potential current detection device are sequentially connected; the high-potential current real-time detection device is connected and arranged between the preceding stage circuit and the first chain link module.

The high-potential current monitoring device comprises a high-potential energy-taking module, a power supply module, a current sensor, a signal processing module and a signal transmission module which are sequentially connected. The high-potential energy-taking module is connected with the preceding-stage circuit and is used for obtaining high-potential electric energy of the preceding-stage circuit; the power supply module is used for receiving the alternating current output by the high-potential energy-taking module, rectifying the alternating current to obtain direct current and outputting the direct current; the current sensor is used for collecting direct current output by the power supply module to obtain a current sampling signal and transmitting the current sampling signal to the signal processing module; the signal processing module is used for outputting the current sampling signal to the controller through the signal transmission module after the current sampling signal is processed. Because the current sensor is used for detecting the direct current output after being processed by the power supply module in real time, the current sensor has the advantages of high sensitivity, quick response time and strong anti-interference capability, and compared with a mode of directly measuring high potential current by using a current transformer, the current detection real-time performance of the device can be improved.

Drawings

FIG. 1 is a block diagram of a high potential current monitoring device in one embodiment;

FIG. 2 is a block diagram of the high potential current monitoring apparatus in another embodiment;

FIG. 3 is a block diagram showing the components of a high-potential current monitoring device according to still another embodiment;

fig. 4 is a schematic diagram of the installation position of the high-potential current monitoring device in the chain-type converter system in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.

As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

The application provides a high potential current detection device, can be used for high potential current detection of high voltage transmission system or high voltage consumer. Referring to fig. 1, the high-potential current detection apparatus includes a high-potential energy-taking module 100, a power module 200, a current sensor 300, a signal processing module 400, and a signal transmission module 500, which are connected in sequence. The high-voltage power-taking module 100 is used for connecting a preceding stage circuit, and the signal transmission module 500 is used for connecting a controller. The high-potential energy-taking module 100 is used for obtaining high-potential electric energy of a preceding stage circuit; the power supply module 200 is configured to receive the alternating current output by the high-potential energy-taking module 100, rectify the alternating current to obtain direct current, and output the direct current; the current sensor 300 is configured to collect the direct current output by the power module 200, obtain a current sampling signal, and transmit the current sampling signal to the signal processing module 400; the signal processing module 400 is configured to output the processed current sampling signal to the controller through the signal transmission module 500.

The pre-stage circuit is a circuit to be detected, the high-potential energy-taking module 100 is arranged at a current detection point of the pre-stage circuit, and the high-potential electric energy of the pre-stage circuit is obtained through a bus-type energy-taking coil, a current converter or other modes. After obtaining the high-potential electric energy of the preceding stage circuit, the high-potential energy-taking module 100 may output the high-potential electric energy to the power module 200 after voltage reduction and conversion, and output low-voltage direct current to the current sensor 300 after rectification processing is performed by the power module 200; the high-potential energy-taking module 100 may also directly output the obtained high-potential electric energy to the power module 200, and then the power module 200 performs voltage reduction conversion and rectification processing to output low-voltage direct current to the current sensor 300. In short, the present embodiment does not limit the specific device configurations of the high-potential energy-taking module 100 and the power module 200.

The current sensor 300 is a device capable of sensing information of a current to be measured and converting the sensed current information into an electric signal according to a preset rule to output, so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like. The current sensor 300 may be classified into a shunt, a hall current sensor, a fiber current sensor, and the like according to measurement principles. In short, the present embodiment does not limit the specific type of the current sensor 300.

After the signal processing module 400 processes the current sampling signal, the obtained detection signal corresponds to the high-potential current information at the current detection point of the preceding stage circuit. Therefore, the specific circuit configuration of the signal processing module 400 is determined by the circuits of the high-potential energy-taking module 100 and the power module 200, and the specific type of the current sensor 300. The power supply of the signal processing module 400 may be a storage battery, or may be solar energy or wind energy. In one embodiment, the power module 200 is connected to the signal processing module 400 for supplying power to the signal processing module 400, that is, the power module 200 supplies power to the current sensor 300 and the signal processing module 400 at the same time, so that a secondary power supply is not required to be provided externally, the circuit configuration can be simplified, and the cost can be saved.

In addition, the signal transmission module 500 may be a wired communication module such as a transmission cable or a transmission optical cable, or may also be a wireless communication module such as a radio or a radio frequency, and in short, the specific type of the signal transmission module 500 is not limited in this embodiment.

Specifically, the high-potential electric energy output by the front-stage circuit is subjected to voltage reduction conversion and rectification processing by the high-potential energy-taking module 100 and the power module 200, and then outputs low-voltage direct current to the current sensor 300. The current sensor 300 samples the dc power output by the power module 200, and transmits a current sampling signal to the signal processing module 400. According to the actual requirement, the signal processing module 400 performs analog-to-digital conversion, encoding, filtering, and other processing on the current sampling signal output by the current sensor 300, and then restores a detection signal corresponding to the high-potential current information at the current detection point of the preceding stage circuit, and sends the detection signal to the signal transmission module 500, and then the signal transmission module 500 sends the detection signal to the controller, that is, the detection of the high-potential current is completed once. The above process is repeated continuously, so that real-time current measurement can be performed according to the sampling frequency of the current sensor 300, and real-time detection of the high potential current of the preceding stage circuit is completed.

The high-potential current monitoring device comprises a high-potential energy-taking module 100, a power supply module 200, a current sensor 300, a signal processing module 400 and a signal transmission module 500 which are connected in sequence. The high-potential energy-taking module 100 is connected with the preceding stage circuit and is used for obtaining high-potential electric energy of the preceding stage circuit; the power supply module 200 is configured to receive the alternating current output by the high-potential energy-taking module 100, rectify the alternating current to obtain direct current, and output the direct current; the current sensor 300 is configured to collect the direct current output by the power module 200, obtain a current sampling signal, and transmit the current sampling signal to the signal processing module 400; the signal processing module 400 is configured to output the processed current sampling signal to the controller through the signal transmission module 500. Because the current sensor 300 is used for detecting the direct current output after being processed by the power module 200 in real time, the advantages of high sensitivity, fast response time and strong anti-interference capability of the current sensor 300 are benefited, and compared with a mode of directly measuring high potential current by using a current transformer, the current sensor can not only improve the response speed and improve the real-time performance of current detection, but also is beneficial to improving the accuracy of a detection result.

In one embodiment, referring to fig. 2, the high-voltage power-up module 100 includes a power-up unit 110 and a converting unit 120; the energy-taking unit 110 is connected with a front-stage circuit, and the conversion unit 120 is connected with the energy-taking unit 110 and the power module 200.

The energy extracting unit 110 is a circuit unit in the high-potential energy extracting module 100 for extracting energy to a previous stage circuit. The energy extraction unit 110 may include a bus-type energy extraction coil, a current transformer, or other energy extraction device. The converting unit 120 is a circuit unit that converts the acquired high-voltage alternating current into low-voltage alternating current, and the converting unit 120 may include a step-down device such as a step-down transformer or a step-down resistor. Specifically, after the high-potential energy-taking module 100 takes energy from the previous-stage circuit through the energy-taking unit 110, the obtained high-voltage alternating current is output to the converting unit 120, and after the converting unit 120 converts the high-voltage alternating current into low-voltage alternating current, the low-voltage alternating current is output to the power module 200.

In the above embodiment, the energy obtaining unit 110 and the converting unit 120 are disposed in the high-potential energy obtaining module 100, and the obtained high-voltage alternating current is converted into the low-voltage alternating current and then output to the power module 200, so that effective high-voltage and low-voltage isolation can be realized, and the safety of the high-potential current detecting device is improved.

In one embodiment, with continued reference to fig. 2, the power module 200 includes a rectifying unit 210 and a filtering unit 220; the rectifying unit 210 is connected to the high-potential energy-taking module 100, and the filtering unit 220 is connected to the rectifying unit 210, the current sensor 300 and the signal processing module 400.

The rectifying unit 210 is a circuit unit that converts ac power into dc power. The rectifying unit 210 is composed of rectifying diodes, and the alternating-current voltage is converted into a unidirectional pulsating direct-current voltage and output after passing through the rectifying unit 210. Specifically, the rectifying unit 210 may be a half-wave rectifying circuit, a full-wave rectifying circuit, a bridge rectifying circuit, a voltage doubler rectifying circuit, or the like. In summary, the present embodiment does not limit the type and specific device configuration of the rectifying unit 210.

The filtering unit 220 functions to reduce the ac component of the pulsating dc voltage as much as possible, and to retain the dc component thereof, so that the ripple factor of the output voltage is reduced, and the waveform becomes smoother. Specifically, the filtering unit 220 may be a passive filtering unit, such as a capacitive filtering unit, an inductive filtering unit, and a complex filtering unit (including an inverted L-type filtering unit, an LC pi-type filtering unit, and an RC pi-type filtering unit); the filtering unit 220 may also be an active filtering unit, including active elements such as a bipolar type tube, a unipolar type tube, or an integrated operational amplifier. In summary, the present embodiment does not limit the type and specific device configuration of the filtering unit 220.

Specifically, the alternating current output by the high-potential energy-taking module 100 is rectified by the rectifying unit 210 to obtain a direct current, the direct current is input into the filtering unit 220, and the direct current is filtered by the filtering unit 220 and then output to the current sensor 300 and the signal processing module 400.

In the above embodiment, the rectifying unit 210 and the filtering unit 220 are disposed in the power module 200, so that after the alternating current output by the high-potential energy-taking module 100 is rectified and filtered, high-quality direct current electric energy is output to be supplied to the signal processing module 400 and the current sensor 300, which is beneficial to improving the energy supply quality of the signal processing module 400 and the current sensor 300 and improving the accuracy of high-potential current detection.

In one embodiment, please continue to refer to fig. 2, the signal processing module 400 includes a signal acquisition unit 410 and a signal processing unit 420; the signal acquisition unit 410 and the signal processing unit 420 are respectively connected with the power module 200; the signal acquisition unit 410 is connected with the current sensor 300, and the signal processing unit 420 is connected with the signal acquisition unit 410 and the signal transmission module 500.

The signal acquisition unit 410 is a circuit unit that converts an analog signal into a digital signal for data acquisition, process control, calculation, display, readout, or other purposes. The signal acquisition unit 410 may include conditioning circuitry and analog-to-digital conversion circuitry. The conditioning circuit may be used to amplify, buffer or scale the analog signal output by the current sensor 300 to fit the input of the analog-to-digital conversion circuit, digitize the analog signal by the analog-to-digital conversion circuit, and send the digital signal to the signal processing unit 420 for data processing of the system.

In one embodiment, referring to fig. 3, the signal processing unit 420 includes an encoding and decoding component 421 and a signal conversion component 422; the encoding and decoding component 421 is connected to the power module 200, the signal acquisition unit 410 and the signal conversion component 422, and the signal conversion component 422 is connected to the signal transmission module 500.

The encoding and decoding component 421 refers to a component capable of transforming a signal or data stream. The transformation includes both the operation of encoding or extracting a signal to obtain an encoded signal for transmission, storage or encryption, and the operation of decoding the encoded signal for viewing or processing. The encoding and decoding component 421 can be a DSP chip, an ARM chip, an MCU chip, an FPGA chip, or a CPLD chip, etc. to realize real-time detection of current, which not only can improve data processing speed, but also can ensure data security. The signal conversion component 422 is used for converting the signal output by the encoding and decoding component 421, generating a signal matched with the signal transmission module 500, and transmitting the signal to the controller through the signal transmission module 500.

In the above embodiment, the signal processing module 400 is used to perform digital processing on the current sampling signal acquired by the current sensor 300, and the signal transmission module 500 is used to transmit the digital signal to the controller, so that the controller can directly receive the digital signal without performing signal processing, which is not only beneficial to reducing the functional requirement of the system on the controller, but also improves the processing speed, and can ensure the data security.

In one embodiment, the signal transmission module 500 is a transmission fiber and the signal conversion component 422 is an optical-to-electrical signal converter.

Optical fibers, also known as optical fibers, are fibers made of glass or plastic that can be used as a means of light transmission. Optical fiber transmission, that is, data and signal transmission using optical fiber as a medium. The optical fiber can be used for transmitting analog signals and digital signals and can meet the requirement of video transmission, the data transmission rate of a single optical fiber can reach several Gbps, and the transmission distance can reach dozens of kilometers under the condition of not using a repeater. To enhance the mechanical properties of the optical fibers and facilitate their use, one or more optical fibers are typically disposed in a protective jacket to form a cable for reuse. The photoelectric signal converter refers to a device capable of converting optical signals and electric signals.

Specifically, after the electrical signal encoded by the encoding and decoding component 421 is transmitted to the optical-electrical signal converter, the optical-electrical signal converter converts the electrical signal into an optical signal, and then the optical signal is transmitted to the controller through the transmission optical fiber.

In the above embodiment, the optical fiber is used as the signal transmission module 500, and the optical fiber has strong anti-interference capability, so that the accuracy and stability of the detection signal in the high-intensity electromagnetic environment can be ensured. Meanwhile, the electrical isolation of the monitoring signals between high voltage and low voltage can be realized through optical fiber communication, the electrical connection between the controller and high potential can be avoided, and the reliability of the system is improved. In addition, because the optical fiber is not influenced by the insulation distance, the wiring constraint is less, the installation is convenient, and the cost is saved.

In one embodiment, the encoding and decoding component 421 is further configured to be connected to a subsequent circuit, and decode the control signal sent by the controller and send the decoded control signal to the subsequent circuit.

Specifically, the controller sends a control signal to the subsequent circuit through the signal transmission module 500 according to the current detection result sent by the high-potential current detection device. The control signal is transmitted to the signal conversion component 422 by the signal transmission module 500, converted into a signal type that can be identified by the encoding and decoding component 421 by the signal conversion component 422, decoded by the encoding and decoding component 421 to obtain a decoded control signal, and sent to the subsequent circuit to control the operation of the subsequent circuit.

In the above embodiment, the high-potential current detection device and the control system of the subsequent circuit share the signal conversion module 422 and the encoding and decoding module 421, which is beneficial to reducing the device components in the circuit system and reducing the circuit cost.

In one embodiment, a chain-type converter system is further provided, which includes a controller, a plurality of chain link modules connected in sequence, and the high-potential current detection device, wherein the controller connects the chain link modules and the high-potential current detection device; the high potential current real-time detection device is connected and arranged between the preceding stage circuit and the first chain link module.

The chain converter is also called an H-bridge series converter, and is often applied to power electronic converter devices such as a chain static synchronous compensator (SVG). The sequential connection of the link modules means that the first end of the alternating current output side of the last link module is connected with the second end of the alternating current output side of the next link module. Specifically, referring to fig. 4, the input side of each link module is used for receiving ac power, the first end of the output side of the first link module U1 is connected to the previous stage circuit through the high potential current real-time detection device SC1, the second end of the output side of the first link module U1 is connected to the first end of the output side of the next link module, and the ac output sides of the plurality of link modules are connected in series in this manner until the last link module UN is connected. The high potential current detection device SC1 is provided between the preceding circuit and the first link module U1, and detects the high potential current of the preceding circuit, and transmits the detection result to the controller, and the controller transmits a control signal to the link module based on the acquired current detection result, and controls each link module to operate.

In the above embodiment, the controller obtains the high potential current information of the preceding stage circuit in real time through the high potential current detection device, and then performs variable current control according to the obtained current information, which is beneficial to improving the timeliness of control and improving the control effect.

In order to better understand the high-potential current detection device, the following detailed explanation is made with reference to specific embodiments.

In a high-voltage power electronic device or high-voltage electric equipment, in order to ensure the safe and stable operation of the equipment, higher requirements are put forward on current detection equipment, and the problems of high-voltage and low-voltage isolation and signal anti-interference capability are particularly more prominent. In consideration of safety, the distance between the position of the high-voltage detection point and the control unit is generally large, and the problem of insulation and electromagnetic interference is difficult to solve simultaneously by adopting a secondary cable mode. The detection mode of converting low-voltage secondary power supply into optical signals is used, the problem of signal interference can be solved, but the secondary power supply cable is subjected to long-distance transmission, a transmitted power supply is easily interfered by the surrounding severe electromagnetic environment, meanwhile, the real isolation of high and low voltage cannot be realized, and the secondary system is easily damaged.

Based on this, please refer to fig. 3, the present application provides a high-potential current detection apparatus, which includes a high-potential energy-taking module 100, a power module 200, a current sensor 300, a signal processing module 400, and a signal transmission module 500, which are connected in sequence. The high-potential energy-taking module 100 comprises an energy-taking unit 110 and a conversion unit 120; the power module 200 includes a rectifying unit 210 and a filtering unit 220; the signal processing module 400 comprises a signal acquisition unit 410, an encoding and decoding component 421 and a signal conversion component 422 which are connected in sequence; the signal transmission module 500 is a transmission fiber, and the signal conversion component 422 is an optical-electrical signal converter. The energy-taking unit 110 is used for connecting a front-stage circuit, the converting unit 120 is connected with the energy-taking unit 110 and the rectifying unit 210, the filtering unit 220 is connected with the rectifying unit 210, the current sensor 300, the signal acquiring unit 410 and the encoding and decoding component 421, the current sensor 300 is connected with the signal acquiring unit 410, the signal converting component 422 is connected with the signal transmission module 500, and the signal transmission module 500 is used for connecting a controller. The encoding and decoding component 421 is also used to connect the subsequent stage circuits.

Specifically, the energy extracting unit 110 is configured to extract energy to a previous stage circuit. The converting unit 120 is configured to convert the high-voltage ac power obtained by the energy obtaining unit 110 from the previous stage circuit into a low-voltage ac power and send the low-voltage ac power to the rectifying unit 210. The rectifying unit 210 is configured to rectify the low-voltage ac output by the converting unit 120 to obtain a dc power and output the dc power. The filtering unit 220 is configured to receive the dc power output by the rectifying unit 210, perform filtering processing, output high-quality dc power, and supply power to the current sensor 300, the signal acquiring unit 410, and the encoding and decoding component 421. The current sensor 300 is configured to collect a current sampling signal output by the filtering unit 220, and send the current sampling signal to the signal collection unit 410, the signal collection unit 410 conditions the signal and then sends the obtained conditioned signal to the encoding and decoding component 421, and the encoding and decoding component 421 encodes the conditioned signal and sends the encoded signal to the photoelectric signal converter. The photoelectric signal converter converts the coded signal into an optical signal and then sends the optical signal to the controller through the transmission optical fiber.

The controller outputs a control signal according to the acquired optical signal, the control signal is transmitted to the photoelectric signal converter by the transmission fiber, converted into an electrical signal, and then reaches the encoding and decoding component 421, and the electrical signal is decoded by the encoding and decoding component 421 and then transmitted to the rear-stage circuit to control the operation of the rear-stage circuit.

In the embodiment, the high-potential current detection device is powered independently from the low-voltage secondary system by high-potential energy taking, so that the high-potential current monitoring device can work independently from the low-voltage system, and the real high-voltage and low-voltage potential isolation is realized; the current sensor is adopted for current detection, so that the detection precision and the response sensitivity can be improved; the programmable logic device is used for processing, digitally coding and decoding the detection signal, so that the calculation speed is high, the operation is stable and the safety is high; the optical fiber is used for transmitting the detection signal, and the interference of the electromagnetic environment to the current transmission signal can be effectively avoided due to the strong anti-interference capability of optical fiber communication, so that the stable work of the detection device is ensured.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.