10kV transformer low-voltage side electric quantity metering device and operation method thereof

Abstract

The invention relates to the technical field of electric power system metering, in particular to a 10kV transformer low-voltage side electric quantity metering device and an operation method thereof, and the device comprises a knife switch, a current transformer, an electric energy meter, a collector, a three-phase voltage junction box, an aviation plug and a socket matched with the aviation plug. The low-voltage side of the transformer is connected with the input end of the knife switch and the output end of the three-phase voltage junction box, the output end of the knife switch is connected to the current transformer, and the output end of the current transformer is connected to a current input end aviation plug matched socket of the electric energy meter through an aviation plug. The output end of the electric energy meter is connected to an input matching socket of the three-phase voltage junction box through an aviation plug, the electric energy meter is connected to the collector with a matching socket of the aviation plug through a communication line with the aviation plug, and the collector is connected to the matching socket of the three-phase voltage junction box through the aviation plug. The problems of fixed wiring metering, corrosion influence and power failure meter replacement of a traditional terminal strip are solved.

Description

Technical Field

[0001] This invention relates to the field of power system metering technology, and in particular to a 10kV transformer low-voltage side power metering device and its operation method. Background Technology

[0002] Currently, voltage and current metering lines are fixed with terminal blocks and screws, resulting in a complex wiring process and a large amount of manual installation work. This is influenced by a combination of factors, including the fixing method, outdoor operating environment, and the skill level of the installers. Human error can lead to loose voltage connections, wiring errors, inaccurate metering, and even safety hazards. Furthermore, after prolonged operation, loose voltage connections can burn out the terminal blocks, further increasing maintenance costs. Additionally, the fixing screws for the voltage terminals are prone to rust and corrosion in outdoor environments, causing low-voltage faults, affecting the grid's low-voltage indicators, and leading to abnormal line losses in the distribution area. Moreover, when the metering device malfunctions and needs replacement, power outages are required, severely impacting power supply reliability and reducing user experience. Therefore, there is an urgent need to develop a new type of 10kV transformer low-voltage side power metering device to improve power supply reliability, metering accuracy, and ease of maintenance, while reducing maintenance costs and safety risks. Summary of the Invention

[0003] This invention provides a 10kV transformer low-voltage side power metering device and its operation method. By optimizing the wiring method and improving the metering device on the low-voltage side outlet side of the transformer, it solves the problems of wiring metering with fixed terminal blocks, corrosion, and meter replacement during power outages.

[0004] To achieve the above objectives, the present invention employs the following technical solution: A 10kV transformer low-voltage side power metering device includes a disconnect switch, a current transformer, an energy meter, a data collector, a three-phase voltage distribution box, an aviation connector, and a matching aviation connector socket. The primary side of the transformer is connected to an external power source, and the low-voltage side of the transformer is connected to the input terminal of the disconnect switch and the output terminal of the three-phase voltage distribution box. The output terminal of the disconnect switch is connected to the current transformer, and the output terminal of the current transformer is connected to the matching aviation connector socket of the current input terminal of the energy meter via an aviation connector. The output terminal of the energy meter is connected to the matching aviation connector socket of the input terminal of the three-phase voltage distribution box via an aviation connector. The energy meter is connected to the data collector, which has a matching aviation connector socket, via a communication line with an aviation connector. The output terminal of the data collector is connected to the matching aviation connector socket of the input terminal of the three-phase voltage distribution box via an aviation connector.

[0005] Furthermore, the aviation plug at the output end of the current transformer is automatically short-circuited when unplugged from the matching socket.

[0006] Furthermore, the connector at the output of the current transformer has 6 pins, with each pair of pins forming a group. The three groups of pins are configured as transmission pins for the three-phase current signals, respectively carrying the secondary side acquisition signals of the A, B, and C phase currents.

[0007] Furthermore, the connector at the output end of the energy meter has four pins, corresponding to the transmission pins for the three-phase voltage and the neutral wire, respectively.

[0008] Furthermore, the communication cable with the aviation connector has two pins on the aviation connector, which correspond to RS485 communication pins respectively.

[0009] Furthermore, the three-phase voltage junction box is a fully sealed, aviation plug-in type three-phase voltage junction box.

[0010] A method for operating a 10kV transformer low-voltage side power metering device includes the following steps: Step 1: Complete component integrity checks, equipment model compatibility verification, and operational safety precautions; Step 2: Install and securely fix the measuring device; Step 3: Complete and lock the connector of the device; The primary side of the metering current transformer with automatic short-circuit function is fixedly connected to the low-voltage side outlet of the transformer. The secondary side of the current transformer is connected to the current input interface of the energy meter through the current connector to complete the transmission of the current signal from the low-voltage side of the transformer to the energy meter. Connect the air plug at the output end of the fully sealed air-sealed three-phase voltage tap-out box to the input end of the knife switch. Connect the two voltage air plug interfaces at the top to the voltage input interfaces of the energy meter and the data collector respectively through air plug cables. An aviation-grade RS485 communication cable is used to connect the communication port of the energy meter to the communication port of the data collector, thus completing the data communication link construction. After the transformer's current and voltage signals are collected and measured, they are stored by the collector and uploaded to the backend system. Step 4: Perform a self-test on the circuit formed by the device and the transformer. If the self-test is normal, proceed to the daily operation and maintenance stage and continue to carry out regular inspections and data verification. If the self-test is abnormal, check for faults in the connector or equipment. After troubleshooting, return to step 3 of the connector wiring and repeat the operation. Step 5: During routine maintenance, it is necessary to determine whether replacement or repair is required. If no replacement is required, continue routine maintenance. If replacement is required, perform live equipment replacement, unplug the old equipment, insert the new equipment and lock it. After completion, return to the routine maintenance process loop.

[0011] Compared with the prior art, the beneficial effects of the present invention are: The device is used in distribution transformer area metering. During its application, it greatly reduces low voltage faults, metering voltage line breaks or short circuits. The operation time is significantly reduced during the replacement of assessment meters and concentrators. Since the terminal blocks are eliminated, power outages of distribution transformers caused by metering device failures are significantly reduced, greatly reducing maintenance costs and time. Due to the connection characteristics of the various parts of the complete metering device, abnormal distribution line situations caused by abnormal power supply at the distribution area are eliminated, greatly saving manpower and material resources in the process of line loss management. The upgrade of low-voltage metering equipment has been completed, and a brand-new metering solution has been proposed. By optimizing the wiring design, the problems of line loss caused by incorrect wiring and safety issues caused by non-standard wiring are solved; the terminal blocks have been eliminated, solving the low voltage problem caused by terminal block corrosion and simplifying the operation and maintenance process; the technical line loss problem caused by meter problems and wiring problems has been solved; and the power outage problem caused by user power failure due to the replacement of metering devices has been solved. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the device described in this invention.

[0013] Figure 2 This is a schematic diagram of the interface of the current-connected connector described in this invention.

[0014] Figure 3 This is a schematic diagram of the interface of the voltage connector described in this invention.

[0015] Figure 4 This is a schematic diagram of the RS485 communication connector described in this invention.

[0016] Figure 5 This is a flowchart of the method described in this invention.

[0017] In the diagram: 1. Transformer; 2. Knife switch; 3. Current transformer; 4. Energy meter; 5. Data collector; 6. Three-phase voltage junction box. Detailed Implementation

[0018] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings: See Figure 1This is a schematic diagram of the structure of the present invention. The present invention provides a 10kV transformer low-voltage side power metering device, comprising a disconnect switch 2, a current transformer 3, an energy meter 4, a data acquisition unit 5, a three-phase voltage distribution box 6, an aviation connector, and a matching socket for the aviation connector. The primary side of the transformer 1 is connected to an external power source. The low-voltage side of the transformer 1 is connected to the input terminal of the disconnect switch 2 and the output terminal of the three-phase voltage distribution box 6. The output terminal of the disconnect switch 2 is connected to the current transformer 3. The output terminal of the current transformer 3 is connected to the matching socket for the aviation connector of the current input terminal of the energy meter 4 via an aviation connector. The output terminal of the energy meter 4 is connected to the matching socket for the aviation connector of the input terminal of the three-phase voltage distribution box 6 via an aviation connector. The energy meter 4 is connected to the data acquisition unit 5, which has a matching socket for the aviation connector, via a communication line with an aviation connector. The output terminal of the data acquisition unit 5 is connected to the matching socket for the aviation connector of the input terminal of the three-phase voltage distribution box 6 via an aviation connector.

[0019] The current transformer 3 is a metering current transformer with an automatic short-circuit function current connector. The three-phase voltage junction box 6 is a three-phase voltage junction box with a fully sealed RS485 communication connector. The energy meter 4 is an energy meter with a voltage connector; The data collector 5 is an aviation plug-in type data collector; This means changing the terminal wiring of traditional energy meters and collectors, replacing them all with pluggable aviation connectors. The current aviation connector has an automatic short-circuit function when pulled out to prevent open circuit faults in the current loop under any circumstances. This device breaks through the traditional wiring mode of fixing terminal blocks with screws, and innovatively configures the connection structure of aviation plug and socket, and is equipped with a fully sealed aviation plug-type three-phase voltage junction box. The above connection structure eliminates the terminal blocks that are prone to rust and errors, solves the low voltage problem caused by the rust of traditional terminal block screws, and avoids the hidden dangers of voltage connection and wiring errors caused by improper fixing methods during manual installation. It greatly simplifies the operation and maintenance process, and makes the wiring operation more standardized, efficient and reliable.

[0020] See Figure 2 The interface of the current connector has 6 pins, with each pair of pins forming a group. The three groups of pins are configured as transmission pins for three-phase current signals, respectively carrying the secondary side acquisition signals of phases A, B, and C. Color coding: A (yellow), 2 pins, corresponding to the A-phase current pin; B-phase green, 2 pins, corresponding to the B-phase current pin; C-phase red has 2 pins, corresponding to the C-phase current pins; Repeated color codes for the same hue reduce the risk of misjudgment in wiring; Shielding design: Equipped with shielded network cable and grounded, it can counteract the impact of outdoor electromagnetic interference on current signals.

[0021] See Figure 3 The voltage connector interface has 4 pins, which correspond to the transmission pins of the three-phase voltage and the neutral line, respectively. Color coding: A yellow corresponds to A-phase voltage, B green corresponds to B-phase voltage, C red corresponds to C-phase voltage, and N blue corresponds to neutral wire, which conforms to the general voltage line color coding standard of the power system; Shielding design: The shielded network cable is grounded to prevent voltage signals from being interfered with by the outdoor environment.

[0022] See Figure 4 The RS485 communication connector interface has two pins, corresponding to the RS485 communication pins TX (data transmission) and RX (data reception). Color coding: A corresponds to the data transmission pin TX, and B corresponds to the data reception pin RX, simplifying the quick identification of communication lines; Shielding design: The shielded network cable is grounded to improve communication stability in complex electromagnetic environments.

[0023] See Figure 5 A method for operating a 10kV transformer low-voltage side power metering device includes the following steps: Step 1: First, carry out preliminary preparations, including component integrity checks, equipment model compatibility verification, and operational safety protection. Step 2: Install and securely fix the measuring device; Step 3: Next, following the order of current circuit, voltage circuit, and communication circuit, complete the connection and lock of each circuit's connector in sequence: Step 4: Perform a self-test on the circuit formed by the device and transformer 1. If the self-test is normal, proceed to the daily operation and maintenance stage and continue to carry out regular inspections and data verification. If the self-test is abnormal, check for faults in the connector or equipment. After the troubleshooting is completed, return to step 3 of the connector wiring and repeat the operation. Step 5: During routine maintenance, it is necessary to determine whether replacement or repair is required. If no replacement is required, continue routine maintenance. If replacement is required, perform live equipment replacement, unplug the old equipment, insert the new equipment and lock it. After completion, return to the routine maintenance process loop.

[0024] The specific usage method of the electricity metering device on the low-voltage side of the 10kV transformer is as follows: Step 1: Current signal acquisition and transmission; The primary side of the metering current transformer 3 with an automatic short-circuit function aviation plug interface is fixedly connected to the low-voltage side outlet of the transformer 1. The secondary side of the current transformer 3 is connected to the current input interface of the energy meter 4 through the current aviation plug to complete the transmission of the low-voltage side current signal of the transformer 1 to the energy meter 4. Step 2: Voltage signal distribution and connection; Connect the 4-pin aviation plug at the output end of the fully sealed three-phase voltage tap-out box to the input end of the knife switch 2. Connect the two voltage aviation plug interfaces at the top to the voltage input interfaces of the energy meter 4 and the data collector 5 respectively through aviation plug cables. Step 3: Establish communication connection for metering data; An RS485 communication cable with an aviation plug is used to connect the communication port of the energy meter 4 to the communication port of the data collector 5 to complete the data communication link construction. Step 4: Implement the metering function; After checking the connection status of all connectors to ensure there are no loose or incorrect connections, the device is started. The current and voltage signals of transformer 1 are collected, measured, stored by collector 5, and uploaded to the background system. This achieves efficient metering of the low-voltage side electrical energy of transformer 1.

[0025] The above embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the above embodiments. Unless otherwise specified, the methods used in the above embodiments are conventional methods.

Claims

1. A power metering device for the low-voltage side of a 10kV transformer, characterized in that, The system includes a knife switch, a current transformer, an energy meter, a data acquisition unit, a three-phase voltage distribution box, an aviation connector, and a matching socket for the aviation connector. The primary side of the transformer is connected to an external power source, and the low-voltage side of the transformer is connected to the input terminal of the knife switch and the output terminal of the three-phase voltage distribution box. The output terminal of the knife switch is connected to the current transformer, and the output terminal of the current transformer is connected to the matching socket for the aviation connector at the current input terminal of the energy meter via an aviation connector. The output terminal of the energy meter is connected to the matching socket for the aviation connector at the input terminal of the three-phase voltage distribution box via an aviation connector. The energy meter is connected to the data acquisition unit with a matching socket for the aviation connector via a communication line with an aviation connector, and the output terminal of the data acquisition unit is connected to the matching socket for the aviation connector at the input terminal of the three-phase voltage distribution box via an aviation connector.

2. The 10kV transformer low-voltage side power metering device according to claim 1, characterized in that, The aviation plug at the output end of the current transformer is automatically short-circuited when unplugged from the matching socket.

3. The 10kV transformer low-voltage side power metering device according to claim 2, characterized in that, The current transformer output terminal has a connector with 6 pins. Each pair of pins forms a group, and the three groups of pins are set as transmission pins for the three-phase current signals, respectively carrying the secondary side acquisition signals of the A, B, and C phase currents.

4. The 10kV transformer low-voltage side power metering device according to claim 1, characterized in that, The connector at the output end of the electricity meter has four pins, which correspond to the transmission pins for the three-phase voltage and the neutral wire, respectively.

5. A 10kV transformer low-voltage side power metering device according to claim 1, characterized in that, The communication cable with the aviation connector has two pins on the aviation connector, which correspond to RS485 communication pins respectively.

6. The 10kV transformer low-voltage side power metering device according to claim 1, characterized in that, The three-phase voltage junction box is a fully sealed, aviation plug-in type three-phase voltage junction box.

7. The operating method of the 10kV transformer low-voltage side power metering device as described in any one of claims 1 to 6, characterized in that, Includes the following steps: Step 1: Complete component integrity checks, equipment model compatibility verification, and operational safety precautions; Step 2: Install and securely fix the measuring device; Step 3: Complete and lock the connector of the device; The primary side of the metering current transformer with automatic short-circuit function is fixedly connected to the low-voltage side outlet of the transformer. The secondary side of the current transformer is connected to the current input interface of the energy meter through the current connector to complete the transmission of the current signal from the low-voltage side of the transformer to the energy meter. Connect the air plug at the output end of the fully sealed air-sealed three-phase voltage tap-out box to the input end of the knife switch. Connect the two voltage air plug interfaces at the top to the voltage input interfaces of the energy meter and the data collector respectively through air plug cables. An aviation-grade RS485 communication cable is used to connect the communication port of the energy meter to the communication port of the data collector, thus completing the data communication link construction. After the transformer's current and voltage signals are collected and measured, they are stored by the collector and uploaded to the backend system. Step 4: Perform a self-test on the circuit formed by the device and the transformer. If the self-test is normal, proceed to the daily operation and maintenance stage and continue to carry out regular inspections and data verification. If the self-test is abnormal, check for faults in the connector or equipment. After troubleshooting, return to step 3 of the connector wiring and repeat the operation. Step 5: During routine maintenance, it is necessary to determine whether replacement or repair is required. If no replacement is required, continue routine maintenance. If replacement is required, perform live equipment replacement, unplug the old equipment, insert the new equipment and lock it. After completion, return to the routine maintenance process loop.

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