Portable intelligent low-voltage transformer area load analyzer

Abstract

The utility model relates to the technical field of low-voltage transformer area load detection, and discloses a portable intelligent low-voltage transformer area load acquisition device, which comprises a box body, an acquisition device main body and an open type current transformer, the acquisition device main body is mounted on one side in the box body and is provided with a switch, a display screen and a power line interface; and the open type current transformers are placed in the groove body on the other side of the box body, the number of the open type current transformers is four, the open type current transformers can be installed on three-phase four wires of each branch line in multiple branches of the low-voltage line, and the open type current transformers are in data transmission connection with the acquisition device main body. The device collects real-time current signals through the open-type current transformer, processes the current signals and wirelessly transmits the current signals to the display screen for display through cooperation of the current converter, the operational amplifier and the ADC analog-to-digital converter of the collection device main body and the low-power-consumption MCU, so that the load distribution condition of the low-voltage transformer area is accurately monitored, and the real-time monitoring of the load distribution condition of the low-voltage transformer area is realized. The collected load data can be ensured to accurately reflect the actual power utilization condition of each household, and reliable support is provided for subsequent three-phase four-wire load adjustment.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage area load detection, in particular to a portable intelligent low-voltage area load analyzer. Background Art

[0002] Distribution transformers are key components of the distribution network, providing electricity directly to consumers. However, due to the initial selection of distribution transformer sites and a lack of rational planning and control for single-phase load access, three-phase load imbalance frequently occurs in the low-voltage distribution transformer area. Specifically, due to the significant uncertainty in peak electricity consumption periods for each household, the load distribution is uneven, resulting in excessive load on some phases, increased neutral current, and neutral point drift. This situation not only increases line voltage drop, reduces the output of the distribution transformer, but also weakens its overload capacity, negatively affecting power quality and even jeopardizing the safe and stable operation of the distribution transformer. The long-standing problem of three-phase load imbalance has posed numerous challenges to the operation and maintenance of the distribution network.

[0003] To address three-phase load imbalance, adjusting the three-phase load has become one of the primary methods. However, load adjustment requires accurate assessment of the three-phase load distribution on-site to determine the specific location and amount of load adjustment. However, due to the random nature of user electricity usage, current measurement methods can only manually select load measurements at a specific time, resulting in significant randomness. This measurement method fails to accurately and comprehensively reflect the load distribution across time periods. This is especially true when low-voltage lines have numerous branch lines. Existing distribution transformer monitoring terminals can only collect total load data for each low-voltage phase and fail to reflect the specific load conditions of each branch line, making accurate load adjustment difficult. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a portable intelligent low-voltage area load analyzer.

[0005] The technical solution adopted by this utility model is:

[0006] A portable intelligent low-voltage substation load collection device comprises a box, a collection device body, and an open-type current transformer; the box is provided with an opening at the top, and a box cover is rotatably installed at the opening; the collection device body is installed on one side of the box, and is provided with a switch, a display screen, and a power cord interface; the open-type current transformers are placed in a slot on the other side of the box, and there are four of them, which can be installed on the three-phase four-wire of each branch of the low-voltage line. The open-type current transformers are connected to the collection device body for data transmission.

[0007] Furthermore, a test wiring port is provided on the main body of the acquisition device, and the open-type current transformers are respectively plugged into the test wiring port through equipment connection lines.

[0008] Furthermore, a circuit board and a lithium iron phosphate battery connected to the circuit board and the display screen are provided in the main body of the acquisition device.

[0009] Furthermore, a power module is provided on the circuit board, and the lithium iron phosphate battery is connected to the power line interface through the power module. The power line interface can be connected to the mains or a power bank through a power line to charge the lithium iron phosphate battery.

[0010] Furthermore, the circuit board is provided with a current converter, which is connected to the test wiring port through the circuit board; the circuit board is provided with an operational amplifier, which is connected to the current converter for data transmission; the circuit board is provided with a low-power MCU, and the MCU has its own ADC analog-to-digital converter, which is connected to the operational amplifier and the display screen for data transmission.

[0011] Furthermore, a data storage module is provided on the circuit board, and the data storage module is connected to the MCU for data transmission; a USB data export interface is also provided on the main body of the acquisition device, and the USB data export interface is connected to the data storage module through the circuit board.

[0012] Furthermore, a radio frequency module is provided on the circuit board, and the MCU is connected to the display screen through the radio frequency module via wireless data transmission; the acquisition device body is connected to the background terminal through wireless data transmission via the radio frequency module; the open-type current transformer is connected to the acquisition device body through wireless data transmission via the radio frequency module.

[0013] The beneficial effects of the utility model are:

[0014] 1. Real-time and accurate load distribution collection: This portable intelligent low-voltage substation load collection device collects real-time current signals through an open-type current transformer. It processes the current signals through a current converter, operational amplifier, ADC analog-to-digital converter and a low-power MCU, and transmits them to the display screen for display, thereby accurately monitoring the load distribution of the low-voltage substation. It solves the randomness problem of traditional measurement methods, ensures that the collected load data accurately reflects the actual electricity consumption of each household, and provides reliable support for subsequent three-phase load adjustment.

[0015] 2. Accurate monitoring of branch line loads: By installing the portable intelligent low-voltage substation load acquisition device on each branch line in the low-voltage line, the three-phase four-wire load conditions of each branch line in the low-voltage line can be accurately monitored. This solves the problem that the existing monitoring system cannot reflect the load distribution of each branch line, facilitates the identification of specific branches with unbalanced loads, and guides more accurate load adjustment operations.

[0016] 3. Improve the efficiency of three-phase load adjustment: The portable intelligent low-voltage substation load collection device adopts a box-type structure as a whole. When in use, the device connection line is installed on each branch line and connected to the collection device body. Through the portable design, it can be assembled and disassembled at any time, and quickly deployed and monitored, which effectively solves the problems of difficult investigation and inaccurate data before load adjustment; greatly improves the efficiency of three-phase load adjustment, ensures that the distribution transformer can work under balanced load, and improves operational reliability and power quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of the portable intelligent low-voltage load collection device of the utility model;

[0019] Figure 2 This is a schematic diagram of the connection between the display screen, circuit board and device connection lines of the main body of the acquisition device of the utility model;

[0020] Figure 3 This is a schematic diagram of the overall structure of the utility model after the radio frequency module is installed;

[0021] Figure 4 This is a schematic diagram of installing a radio frequency module on a circuit board of the present invention;

[0022] Markings in the figure: 1. Box body; 2. Collection device body; 3. Open-type current transformer; 4. Box cover; 5. Test connection port; 6. Switch; 7. Display screen; 8. Power cord interface; 9. Equipment connection cable; 10. Circuit board; 11. Lithium iron phosphate battery; 12. Power module; 13. Current converter; 14. Operational amplifier; 15. MCU; 16. Data storage module; 17. USB data export interface; 18. Radio frequency module. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them.

[0024] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein can be combined with each other. It should be noted that similar numbers and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] This embodiment provides a portable intelligent low-voltage load collection device; Figure 1 As shown, the portable intelligent low-voltage substation load collection device includes a box, a collection device body, and an open-type current transformer.

[0026] Specifically, such as Figure 1 As shown, the box is a rectangular box with an opening at the top and a rotatable lid mounted at the opening for opening or closing. The main body of the data acquisition device is installed on one side of the box and is equipped with a test connection port, a switch, a display screen, and a power cord interface. Four open-type current transformers are placed in a slot on the other side of the box. These are commercially available products, such as the Schneider A9N150 open-type CT for low-voltage current monitoring. These open-type current transformers can be installed on the three-phase four-wire lines of multiple branches of a low-voltage line, and data is transmitted between the main body of the data acquisition device and the device via a device connection cable plugged into the test connection port.

[0027] When conducting low-voltage substation load detection, the portable intelligent low-voltage substation load acquisition device can be installed on each branch of the low-voltage line. During installation, open the box cover, take out four open-type current transformers from the box and install them on the three-phase four-wire of each branch. At the same time, plug the device connection line into the test connection port of the acquisition device body. At this time, start the switch of the acquisition device body.

[0028] This portable intelligent low-voltage substation load collection device collects the current signals of the three-phase four-wire of each branch line in real time through an open-type current transformer. The main body of the collection device processes the current signal and displays the load data through a display screen, thereby accurately monitoring the load distribution of the low-voltage substation, ensuring that the collected load data accurately reflects the actual electricity consumption of each household, and providing reliable support for subsequent three-phase load adjustment; at the same time, based on the load data of each branch line in the multiple branches of the low-voltage line, it can accurately monitor the three-phase load conditions of each branch line in the multiple branches of the low-voltage line, facilitate the identification of specific branches with load imbalance, and guide more accurate load adjustment operations.

[0029] The specific structure and working principle of the collection device body in this embodiment are as follows:

[0030] like Figure 2 As shown, the main body of the collection device in this embodiment is provided with a circuit board and a lithium iron phosphate battery connected to the circuit board and the display screen, and the circuit board and the display screen are powered by the lithium iron phosphate battery; the lithium iron phosphate battery can be a commercially available finished device. The lithium iron phosphate battery has good high and low temperature performance, can work stably under harsh environmental conditions, has a long battery life, supports continuous detection day and night, and ensures the continuity and integrity of load data collection throughout the day.

[0031] In addition, if Figure 2 As shown, the circuit board is equipped with a power module, which connects the lithium iron phosphate battery to the power cord interface through the power module. The power cord interface can be connected to the mains or a power bank via a power cord to charge the lithium iron phosphate battery. The power module uses a commercially available off-the-shelf device, such as the RAC120-12SER high-efficiency power module. Its function is to convert external power to the voltage and current required by the internal circuit to charge the lithium iron phosphate battery.

[0032] The circuit board in this embodiment is provided with a current converter, an operational amplifier and a low-power MCU; Figure 2 As shown, the current converter is connected to the test wiring port via a circuit board. A commercially available current converter, such as the Texas Instruments INA180 current converter, converts the current signal collected by the open-type current transformer into a voltage signal. An operational amplifier, such as the National Semiconductor LM324 quad-channel operational amplifier, is connected to the current converter for data transmission. The operational amplifier adjusts the analog voltage signal to an appropriate range and multiple, generating an analog voltage signal to ensure that the signal can be converted and processed in subsequent steps. The MCU is connected to the operational amplifier and the display screen for data transmission. The MCU's built-in ADC, such as the Microchip Technology PIC16F877A microcontroller, converts the analog voltage signal into a digital signal through the ADC and transmits it to the display screen for display. This accurately monitors the load distribution of the low-voltage substation, ensuring that the collected load data accurately reflects each household's actual electricity consumption and providing reliable support for subsequent three-phase load adjustment.

[0033] Furthermore, as a preferred technical solution of this embodiment, Figure 1 and 2As shown, a data storage module is provided on the circuit board in this embodiment. The data storage module adopts commercially available finished equipment, such as: Microchip Technology 24AA series erasable programmable read-only memory. The data storage module is connected to the MCU for data transmission, so as to store the load data of the low-voltage area. A USB data export interface is also provided on the main body of the acquisition device. The USB data export interface is connected to the data storage module through the circuit board, so that the background equipment is connected to the main body of the acquisition device to export the load data of the low-voltage area.

[0034] Furthermore, as a preferred technical solution of this embodiment, Figure 3 and Figure 4 As shown, in this embodiment, the data transmission connection line between the MCU and the display screen, the data storage module, the device connection line between the open-type current transformer and the acquisition device body, and the test connection port on the acquisition device body are eliminated;

[0035] A commercially available RF module, such as the Quectel BG96 multi-mode wireless communication module, is also installed on the circuit board. This module supports various networks, including NB-IoT, LTE, and GPRS. With the RF module installed, the three-phase, four-wire current signals from each branch line, collected in real time by the open-type current transformers, are wirelessly transmitted to the main unit. Simultaneously, the MCU also connects wirelessly to the display screen and backend terminals via the RF module, transmitting load data to the display screen and backend equipment.

[0036] The above are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited to them. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention within the technical scope disclosed by the present invention, and they should be covered by the protection scope of the present invention.

Claims

1. A portable intelligent low-voltage load analyzer, characterized by: The portable intelligent low-voltage substation load analyzer includes a box, a collection device body, and an open-type current transformer; the box top is provided with an opening, and a box cover is rotatably installed at the opening; the collection device body is installed on one side of the box, and is provided with a switch, a display screen, and a power cord interface; the open-type current transformers are placed in a slot on the other side of the box, and there are four of them, which can be installed on the three-phase four-wire of each branch of the low-voltage line. The open-type current transformers are connected to the collection device body for data transmission.

2. The portable intelligent low-voltage area load analyzer according to claim 1 is characterized in that: The main body of the acquisition device is provided with a test wiring port, and the open-type current transformers are respectively plugged into the test wiring port through equipment connection lines.

3. The portable intelligent low-voltage area load analyzer according to claim 2 is characterized in that: The main body of the acquisition device is provided with a circuit board and a lithium iron phosphate battery connected with the circuit board and the display screen.

4. The portable intelligent low-voltage area load analyzer according to claim 3 is characterized by: The circuit board is provided with a power module, and the lithium iron phosphate battery is connected to the power line interface through the power module. The power line interface can be connected to the mains or a power bank through a power line to charge the lithium iron phosphate battery.

5. The portable intelligent low-voltage area load analyzer according to claim 3 is characterized by: The circuit board is provided with a current converter, which is connected to the test wiring port through the circuit board; the circuit board is provided with an operational amplifier, which is connected to the current converter for data transmission; the circuit board is provided with a low-power MCU, and the ADC analog-to-digital converter provided by the MCU is connected to the operational amplifier and the display screen for data transmission.

6. The portable intelligent low-voltage area load analyzer according to claim 5 is characterized in that: The circuit board is provided with a data storage module, which is connected to the MCU for data transmission; the acquisition device body is also provided with a USB data export interface, which is connected to the data storage module through the circuit board.

7. The portable intelligent low-voltage area load analyzer according to claim 5 is characterized in that: The circuit board is provided with a radio frequency module, and the MCU is connected to the display screen through the radio frequency module via wireless data transmission; the acquisition device body is connected to the background terminal through wireless data transmission via the radio frequency module; the open-type current transformer is connected to the acquisition device body through wireless data transmission via the radio frequency module.

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