阅读说明：本技术 一种变电站无线多点电流电压相位伏安测量表计 (Wireless multipoint current-voltage phase volt-ampere measuring meter of transformer substation ) 是由 黄智华 沈力 王元冬 袁峻 张南辉 刘志洪 刘洪兵 侯斌 李蕊 邹学翔 罗昕宇 于 2020-12-07 设计创作，主要内容包括：本发明是一种变电站无线多点电流电压相位伏安测量表计,该表计包含一个数据处理主机和2个电压采集单元、8个电流采集单元；电压采集单元与主机、电流采集单元与主机之间均通过无线通信进行数据传输,数据处理主机负责完成所有电压采集单元、电流采集单元的时间同步功能、数据采集控制功能。本发明满足了目前智能变电站电流电压采集特殊方式下,电流电压幅值相位测量所需的长距离数据同步采集及传输的需求。(The invention relates to a wireless multipoint current-voltage phase volt-ampere measuring meter of a transformer substation, which comprises a data processing host, 2 voltage acquisition units and 8 current acquisition units, wherein the data processing host is connected with the voltage acquisition units; the voltage acquisition unit and the host computer, the current acquisition unit and the host computer are in data transmission through wireless communication, and the data processing host computer is responsible for completing the time synchronization function and the data acquisition control function of all the voltage acquisition units and the current acquisition units. The invention meets the requirement of long-distance data synchronous acquisition and transmission required by current and voltage amplitude phase measurement in a special current and voltage acquisition mode of the intelligent substation.)

1. The utility model provides a wireless multiple spot current-voltage phase volt-ampere meter of transformer substation which characterized in that: the meter comprises a data processing host, 2 voltage acquisition units and 8 current acquisition units; the voltage acquisition units and the host, and the current acquisition units and the host are in data transmission through wireless communication, the data processing host is responsible for completing time synchronization functions and data acquisition control functions of all the voltage acquisition units and the current acquisition units, the data acquisition control is integrated in the data processing host, and each voltage acquisition unit and each current acquisition unit are only responsible for completing data acquisition, data exchange and data uploading functions after acquiring acquisition commands;

the data processing host has volt-ampere characteristic analysis of multipoint current and voltage acquisition data and a vector diagram display function under the unified reference of measurement data, is connected with the data acquisition slave machine in a 2.4GHz wireless data transmission mode, synchronizes the acquisition data through a synchronization signal for each unit, and ensures the passing of alternating current acquisition and the accuracy of data analysis; the data processing host computer displays the test result on the LCD screen and can send the test result and data out through a wireless or wired data transmission interface;

the voltage acquisition unit consists of an alternating current voltage acquisition unit singlechip and a 2.4GHz wireless communication module, and the work and the exit of the voltage acquisition unit are controlled by the data processing host;

the current acquisition unit consists of an alternating current acquisition current unit singlechip and a 2.4GHz wireless communication module, and the work and the exit of the current acquisition unit are controlled by the data processing host.

2. The substation wireless multipoint current-voltage phase voltammetry meter according to claim 1, characterized in that: the data processing host hardware comprises:

1) a charging module adapted to an AC220V power source;

2) the power supply management module is provided with a battery overcharge protection circuit, the battery overcharge protection circuit is connected with the battery charging module, the rear end of the battery pack is provided with a battery overdischarge protection circuit, and the battery overdischarge protection circuit is connected with the pure sine wave inverter; the lithium battery pack supplies power to other parts of the data processing host through the power supply circuit;

3) the 2.4GHz wireless communication module is formed by a Nordic nRF24E1 singlechip and a wireless transceiving antenna and is used for freely communicating with each voltage acquisition unit and each current acquisition unit; a 2.4GHz wireless core nRF2401 chip is embedded in the nRF24E1, and CRC check and multi-point communication control are built in the nRF 24078 chip for point-to-multi communication;

4) the LCD is used for displaying data processing results and information;

5) the data processing and operation unit is based on an STM32F103X main control chip of the Italian semiconductor company, a 12-bit A/D converter with 16 channels is provided, a clock system carried by the chip is utilized to realize data acquisition synchronization with the voltage acquisition unit and the current acquisition unit, and meanwhile, software design of a data acquisition system is carried out on a singlechip upper computer to realize processing and display of acquired data;

6) the function control module adopts a TMS320F2812 chip of Texas instruments to realize the centralized control of the whole data acquisition and analysis system and send a control command to the data processing and operation unit.

3. The substation wireless multipoint current-voltage phase voltammetry meter according to claim 1, characterized in that: the voltage acquisition unit hardware includes:

1) a charging module adapted to an AC220V power source;

2) the power supply management module is provided with a battery overcharge protection circuit, the battery overcharge protection circuit is connected with the battery charging module, the rear end of the battery pack is provided with a battery overdischarge protection circuit, and the battery overdischarge protection circuit is connected with the pure sine wave inverter; the lithium battery pack supplies power to other parts of the data processing host through the power supply circuit;

3) the 2.4GHz wireless communication module is formed by a Nordic nRF24E1 singlechip and a wireless transceiving antenna, is used for freely communicating with each voltage acquisition unit and each current acquisition unit, is embedded with a 2.4GHz wireless core nRF2401 chip in nRF24E1, is internally provided with CRC (cyclic redundancy check) check and multipoint communication control, and is used for point-to-multipoint communication;

4) the voltage acquisition unit adopts hall mutual inductor collection alternating voltage signal, and signal transfer to meaning semiconductor company STM32 chip adjusts the signal of gathering, and signal processing circuit carries out the AD sampling with the signal of adjusting and carries out the operation processing to use 4GHz wireless communication module to send the concentrated data processing unit with data.

4. The substation wireless multipoint current-voltage phase voltammetry meter according to claim 1, characterized in that: the current acquisition unit hardware includes:

1) a charging module adapted to an AC220V power source;

2) the power supply management module is provided with a battery overcharge protection circuit, the battery overcharge protection circuit is connected with the battery charging module, the rear end of the battery pack is provided with a battery overdischarge protection circuit, the battery overdischarge protection circuit is connected with a pure sine wave inverter, and the lithium battery pack supplies power to other parts of the data processing host through a power supply circuit;

3) the 2.4GHz wireless communication module is formed by a Nordic nRF24E1 singlechip and a wireless transceiving antenna and is used for freely communicating with each voltage acquisition unit and each current acquisition unit; a 2.4GHz wireless core nRF2401 chip is embedded in the nRF24E1, CRC check and multi-point communication control are built in, and the method is suitable for point-to-multi communication;

4) the Hall mutual inductor is used for collecting alternating voltage signals, the signals are transmitted to the STM32 to be adjusted, the signal processing circuit is used for carrying out A/D sampling on the adjusted signals and carrying out operation processing, and a 4GHz wireless communication module is used for uploading data to the centralized data processing unit.

Technical Field

The invention relates to the technical field of power system measurement, in particular to a wireless multipoint current-voltage phase volt-ampere measuring meter for a transformer substation.

Background

After a current and voltage vector used by a secondary system relay protection device of a transformer substation is newly built or reconstructed to be put into operation with load, a current and voltage loop which is checked and accepted in the early stage needs to be subjected to a load volt-ampere characteristic test, so that the correctness of the wiring and the polarity phase sequence of the current and voltage loop is verified through the phase and the amplitude of the current and voltage vector of the actual load.

The double-pincerlike phase voltammeter used in the existing system adopts wired connection and data transmission, a current and voltage test channel is generally provided with two voltage inputs and two current inputs, and the double-pincerlike phase voltammeter can meet the measurement and verification of the current and voltage quantity in the secondary system test. However, due to the data transmission mode and the limited number of data acquisition channels, in some occasions where a plurality of alternating current or voltage quantities need to be measured and verified at the same time, such as bus protection alternating current quantities, the phase voltammetry meter needs to be repeatedly measured for many times, but when the power grid system is changed instantly and alternating current quantities measured at different time periods are put together to perform system verification, a more accurate result cannot be obtained.

In addition, the intelligent station is developed rapidly at present, a special current and voltage acquisition mode is adopted for the intelligent station, partial transformer stations are adopted in the intelligent transformer station, secondary output analog quantities of an outdoor current transformer and a voltage transformer are transmitted to an intelligent merging unit located in a main control room through analog-to-digital conversion and an optical circuit, so that a protection screen in the intelligent station is not located in a protection screen of a conventional station, all voltage and current circuits can be found easily, the distance between the two alternating current and voltage flows to be measured can be tens of meters to hundreds of meters, and the traditional double-clamp phase volt-ampere meter used at present cannot meet the field use requirements of the transformer station. Therefore, there is an urgent need to develop a wireless multi-point current-voltage phase voltammetry meter for a transformer substation.

Disclosure of Invention

The invention aims to provide a wireless multipoint current-voltage phase voltammeter for a transformer substation, which aims to solve the problems that the traditional double-clamp phase voltammeter used in the existing power system has great limitation on data acquisition and transmission and cannot meet the requirements of simultaneous acquisition and vector analysis of multiple paths of alternating current of part of protection devices.

The technical scheme adopted by the invention is as follows:

a wireless multipoint current-voltage phase volt-ampere measuring meter for a transformer substation comprises a data processing host, 2 voltage acquisition units and 8 current acquisition units; the voltage acquisition units and the host, and the current acquisition units and the host are in data transmission through wireless communication, the data processing host is responsible for completing time synchronization functions and data acquisition control functions of all the voltage acquisition units and the current acquisition units, the data acquisition control is integrated in the data processing host, and each voltage acquisition unit and each current acquisition unit are only responsible for completing data acquisition, data exchange and data uploading functions after acquiring acquisition commands;

the data processing host has volt-ampere characteristic analysis of multipoint current and voltage acquisition data and a vector diagram display function under the unified reference of measurement data, is connected with the data acquisition slave machine in a 2.4GHz wireless data transmission mode, synchronizes the acquisition data through a synchronization signal for each unit, and ensures the passing of alternating current acquisition and the accuracy of data analysis;

the data processing host computer displays the test result on the LCD screen and can send the test result and data out through a wireless or wired data transmission interface;

the voltage acquisition unit consists of an alternating current voltage acquisition unit singlechip and a 2.4GHz wireless communication module, and the work and the exit of the voltage acquisition unit are controlled by the data processing host;

the current acquisition unit consists of an alternating current acquisition current unit singlechip and a 2.4GHz wireless communication module, and the work and the exit of the current acquisition unit are controlled by the data processing host.

Further, the data processing host hardware comprises:

1) a charging module adapted to an AC220V power source;

2) the power supply management module is provided with a battery overcharge protection circuit, the battery overcharge protection circuit is connected with the battery charging module, the rear end of the battery pack is provided with a battery overdischarge protection circuit, and the battery overdischarge protection circuit is connected with the pure sine wave inverter; the lithium battery pack supplies power to other parts of the data processing host through the power supply circuit;

3) the 2.4GHz wireless communication module is formed by a Nordic nRF24E1 singlechip and a wireless transceiving antenna and is used for freely communicating with each voltage acquisition unit and each current acquisition unit; a 2.4GHz wireless core nRF2401 chip is embedded in the nRF24E1, and CRC check and multi-point communication control are built in the nRF 24078 chip for point-to-multi communication;

4) the LCD is used for displaying data processing results and information;

5) the data processing and operation unit is based on an STM32F103X main control chip of the Italian semiconductor company, a 12-bit A/D converter with 16 channels is provided, a clock system carried by the chip is utilized to realize data acquisition synchronization with the voltage acquisition unit and the current acquisition unit, and meanwhile, software design of a data acquisition system is carried out on a singlechip upper computer to realize processing and display of acquired data;

6) the function control module adopts a TMS320F2812 chip of Texas instruments to realize the centralized control of the whole data acquisition and analysis system and send a control command to the data processing and operation unit.

Further, the voltage acquisition unit hardware includes:

1) a charging module adapted to an AC220V power source;

2) the power supply management module is provided with a battery overcharge protection circuit, the battery overcharge protection circuit is connected with the battery charging module, the rear end of the battery pack is provided with a battery overdischarge protection circuit, and the battery overdischarge protection circuit is connected with the pure sine wave inverter; the lithium battery pack supplies power to other parts of the data processing host through the power supply circuit;

3) the 2.4GHz wireless communication module is formed by a Nordic nRF24E1 singlechip and a wireless transceiving antenna, is used for freely communicating with each voltage acquisition unit and each current acquisition unit, is embedded with a 2.4GHz wireless core nRF2401 chip in nRF24E1, is internally provided with CRC (cyclic redundancy check) check and multipoint communication control, and is used for point-to-multipoint communication;

4) the voltage acquisition unit adopts hall mutual inductor collection alternating voltage signal, and signal transfer to meaning semiconductor company STM32 chip adjusts the signal of gathering, and signal processing circuit carries out the AD sampling with the signal of adjusting and carries out the operation processing to use 4GHz wireless communication module to send the concentrated data processing unit with data.

Further, the current collection unit hardware includes:

1) a charging module adapted to an AC220V power source;

2) the power supply management module is provided with a battery overcharge protection circuit, the battery overcharge protection circuit is connected with the battery charging module, the rear end of the battery pack is provided with a battery overdischarge protection circuit, the battery overdischarge protection circuit is connected with a pure sine wave inverter, and the lithium battery pack supplies power to other parts of the data processing host through a power supply circuit;

3) the 2.4GHz wireless communication module is formed by a Nordic nRF24E1 singlechip and a wireless transceiving antenna and is used for freely communicating with each voltage acquisition unit and each current acquisition unit; a 2.4GHz wireless core nRF2401 chip is embedded in the nRF24E1, CRC check and multi-point communication control are built in, and the method is suitable for point-to-multi communication;

4) the Hall mutual inductor is used for collecting alternating voltage signals, the signals are transmitted to the STM32 to be adjusted, the signal processing circuit is used for carrying out A/D sampling on the adjusted signals and carrying out operation processing, and a 4GHz wireless communication module is used for uploading data to the centralized data processing unit.

The invention has the beneficial effects that:

1. the invention can completely replace the commonly used double-clamp phase voltammeter in the current system, can be used in other transformer substations or other places with special requirements and severe test conditions, and can also be used in the current voltage voltammetry characteristic test working site of intelligent transformer substations which is developed rapidly at present.

2. The method can realize synchronous measurement of all current and voltage data at the same moment, judge the polarity of the current and voltage loop and the correctness of wiring more accurately, and completely solve the problem of time difference existing in the test data of the phase voltammeter at the present stage, thereby causing errors in the judgment of the polarity of the alternating current loop and the correctness of wiring. The requirements of long-distance data synchronous acquisition and transmission required by current and voltage amplitude phase measurement in a special current and voltage acquisition mode of the intelligent substation are met.

Drawings

FIG. 1 is a schematic diagram of a data processing host according to the present invention.

FIG. 2 is a block diagram of the data processing host hardware of the present invention.

Fig. 3 is a schematic structural diagram of the voltage acquisition unit of the present invention.

Fig. 4 is a hardware block diagram of the voltage acquisition unit of the present invention.

Fig. 5 is a schematic structural diagram of the current collecting unit of the present invention.

Fig. 6 is a hardware block diagram of the current acquisition unit of the present invention.

In the figure, a 1-2.4GHz wireless communication module, a 2-data transmission interface (USB), a 3-LCD liquid crystal display screen, a 4-communication indicator light, a 5-power switch, a 6-function button, a 7-charging port, an 8-2.4GHz wireless communication module, a 9-communication indicator light, a 10-power switch, an 11-voltage acquisition interface (one-way voltage), a 12-charging port, a 13-2.4GHz wireless communication module, a 14-communication indicator light, a 15-power switch, a 16-current acquisition interface (two-way current) and a 17-charging port.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The instruments and appliances are not indicated by manufacturers, and all the instruments and appliances are conventional products which can be obtained by purchasing.

The invention relates to a wireless multipoint current-voltage phase volt-ampere measuring meter for a transformer substation, which comprises a data processing host, 2 voltage acquisition units and 8 current acquisition units, wherein the voltage acquisition units are connected with the data processing host; the voltage acquisition unit and the host computer, the current acquisition unit and the host computer are all communicated through wireless for data transmission, the data processing host computer is responsible for accomplishing time synchronization function and data acquisition control function of all voltage acquisition units and current acquisition units, the data acquisition control is integrated in the data processing host computer, and each voltage acquisition unit and current acquisition unit are only responsible for accomplishing data acquisition, data exchange and data uploading function after obtaining the acquisition command.

The data processing host has volt-ampere characteristic analysis of multipoint current and voltage acquisition data and a vector diagram display function under the unified reference of measurement data, is connected with the data acquisition slave machine in a 2.4GHz wireless data transmission mode, synchronizes the acquisition data through a synchronization signal for each unit, and ensures the passing of alternating current acquisition and the accuracy of data analysis.

The data processing host computer displays the test result on the LCD screen and sends the test result and data out through the wireless or wired data transmission interface.

The voltage acquisition unit consists of an alternating current voltage acquisition unit singlechip and a 2.4GHz wireless communication module, and the work and the exit of the voltage acquisition unit are controlled by the data processing host.

The current acquisition unit consists of an alternating current acquisition current unit singlechip and a 2.4GHz wireless communication module, and the work and the exit of the current acquisition unit are controlled by the data processing host.

As shown in fig. 1, the data processing host body structure includes: the device comprises a shell 1, a data transmission interface (USB) 2, an LCD (liquid crystal display) 3, a communication indicator lamp 4, a power switch 5, a function button 6 and a charging port 7.

As shown in fig. 2, the data processing host hardware comprises:

1) a charging module adapted to an AC220V power source;

2) the power supply management module is provided with a battery overcharge protection circuit, the battery overcharge protection circuit is connected with the battery charging module, the rear end of the battery pack is provided with a battery overdischarge protection circuit, and the battery overdischarge protection circuit is connected with the pure sine wave inverter; the lithium battery pack supplies power to other parts of the data processing host through the power supply circuit;

3) the 2.4GHz wireless communication module is formed by a Nordic nRF24E1 singlechip and a wireless transceiving antenna and is used for freely communicating with each voltage acquisition unit and each current acquisition unit; a 2.4GHz wireless core nRF2401 chip is embedded in the nRF24E1, and CRC check and multi-point communication control are built in the nRF 24078 chip for point-to-multi communication;

4) the LCD is used for displaying data processing results and information;

5) the data processing and operation unit is based on an STM32F103X main control chip of the Italian semiconductor company, a 12-bit A/D converter with 16 channels is provided, a clock system carried by the chip is utilized to realize data acquisition synchronization with the voltage acquisition unit and the current acquisition unit, and meanwhile, software design of a data acquisition system is carried out on a singlechip upper computer to realize processing and display of acquired data;

6) the function control module adopts a TMS320F2812 chip of Texas instruments to realize the centralized control of the whole data acquisition and analysis system and send a control command to the data processing and operation unit.

As shown in fig. 3, the present invention has 2 voltage acquisition units, and its body structure includes a housing 8, a communication indicator lamp 9, a power switch 10, a voltage acquisition interface 11 (a path of voltage), and a charging port 12.

As shown in fig. 4, the voltage acquisition unit hardware package of the present invention:

1) a charging module adapted to an AC220V power source;

2) the power supply management module is provided with a battery overcharge protection circuit, the battery overcharge protection circuit is connected with the battery charging module, the rear end of the battery pack is provided with a battery overdischarge protection circuit, and the battery overdischarge protection circuit is connected with the pure sine wave inverter; the lithium battery pack supplies power to other parts of the data processing host through the power supply circuit;

3) the 2.4GHz wireless communication module is formed by a Nordic nRF24E1 singlechip and a wireless transceiving antenna, is used for freely communicating with each voltage acquisition unit and each current acquisition unit, is embedded with a 2.4GHz wireless core nRF2401 chip in nRF24E1, is internally provided with CRC (cyclic redundancy check) check and multipoint communication control, and is used for point-to-multipoint communication;

4) the voltage acquisition unit adopts hall mutual inductor collection alternating voltage signal, and signal transfer to meaning semiconductor company STM32 chip adjusts the signal of gathering, and signal processing circuit carries out the AD sampling with the signal of adjusting and carries out the operation processing to use 4GHz wireless communication module to send the concentrated data processing unit with data.

As shown in fig. 5, the present invention has 8 current collecting units, and the body structure thereof includes: the device comprises a shell 13, a communication indicator lamp 14, a power switch 15, a current acquisition interface (two-way current) 16 and a charging port 17.

As shown in fig. 6, the current collection unit hardware of the present invention includes:

1) a charging module adapted to an AC220V power source;

2) the power supply management module is provided with a battery overcharge protection circuit, the battery overcharge protection circuit is connected with the battery charging module, the rear end of the battery pack is provided with a battery overdischarge protection circuit, the battery overdischarge protection circuit is connected with a pure sine wave inverter, and the lithium battery pack supplies power to other parts of the data processing host through a power supply circuit;

3) the 2.4GHz wireless communication module is formed by a Nordic nRF24E1 singlechip and a wireless transceiving antenna and is used for freely communicating with each voltage acquisition unit and each current acquisition unit; a 2.4GHz wireless core nRF2401 chip is embedded in the nRF24E1, CRC check and multi-point communication control are built in, and the method is suitable for point-to-multi communication;

4) the Hall mutual inductor is used for collecting alternating voltage signals, the signals are transmitted to the STM32 to be adjusted, the signal processing circuit is used for carrying out A/D sampling on the adjusted signals and carrying out operation processing, and a 4GHz wireless communication module is used for uploading data to the centralized data processing unit.

The measuring meter comprises 2 paths of voltage acquisition units and 8 paths of current acquisition units, wherein the configuration quantity of the two types of acquisition units is configured according to the requirements of an operation site, and the two types of acquisition units are independent in function and do not interfere with each other. All the acquisition units are uniformly controlled by the data processing host, the acquisition of voltage and current data volume is completed at each place of the transformer substation after receiving a working command issued by the data processing host through the voltage and current acquisition function of the acquisition units, then the data is uploaded to the data processing host through the wireless communication modules equipped for the acquisition units, and each voltage and current acquisition unit can also receive a working command and a clock synchronization command sent by the data processing host;

the data processing host integrates the master control function of the acquisition instrument and is responsible for sending a work control instruction and a clock synchronization instruction of acquired data to each voltage and current acquisition unit when the measurement conditions are met; meanwhile, the data processing function of the system is utilized to perform processing level vector conversion on the data acquired by each voltage acquisition unit and each current acquisition unit under the same scale, and then the data processing result is finally displayed in the LCD screen of the host machine for the use of testers.