A 10kV line boundary switch control and electric energy metering fusion device and method

Abstract

The present invention relates to the technical field of 10kV distribution lines, and is a device and method for integrating 10kV line boundary switch control and electric energy metering. The former comprises a circuit breaker control unit, a boundary switch, an electric energy metering unit, a three-phase five-pole voltage transformer, a distribution automation unit and a marketing unit; the three-phase five-pole voltage transformer is installed on the power supply side of the 10kV line boundary switch, and is used to measure the three-phase voltage and zero-sequence voltage of the line, and output the voltage to the circuit breaker control unit and the electric energy metering unit; the electric energy metering unit is installed at the boundary switch, and is used to collect the line voltage and current; the present invention designs the user boundary switch control equipment and the high-voltage metering equipment into a set of devices, that is, by arranging the circuit breaker control unit and the electric energy metering unit and installing them at the boundary switch, the device has a simple structure and is easy to install, avoids the problem of wiring errors caused by a complicated wiring process, and improves the installation efficiency of the on-site installation equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of 10kV distribution lines, and in particular to a 10kV line boundary switch control and electric energy metering fusion device and method. Background Art

[0002] Currently, the user boundaries of 10kV distribution lines require both pole-mounted boundary switches and high-voltage energy metering devices. The boundary switches isolate and remove faults between the user boundary and the main line, while the high-voltage metering devices measure the energy of the user boundary. Currently, the user boundary switches and high-voltage metering devices are installed completely independently at the user boundary to achieve fault isolation and energy metering at the user boundary. Both devices require their own voltage and current transformers to measure line voltage and current and user energy. On-site installation methods are complex and varied, wiring is complex, and wiring errors are prone to occur. This results in a high failure rate, large equipment investment, and a low degree of standardization.

[0003] Therefore, it is necessary to use various new technologies and methods to achieve high concentration and standardization of equipment at high-voltage boundary users, save investment and improve the convenience of on-site installation. Summary of the Invention

[0004] The present invention provides a 10kV line boundary switch control and electric energy metering fusion device and method, which overcomes the shortcomings of the above-mentioned existing technologies and can effectively solve the problems of complex on-site installation and wiring, and easy occurrence of wiring errors, etc. when two sets of control equipment and metering equipment are separately provided at the high-voltage boundary switch.

[0005] To solve the above problems, one of the technical solutions of the present invention is achieved in the following manner: a 10kV line boundary switch control and electric energy metering fusion device, comprising a circuit breaker control unit, a boundary switch, an electric energy metering unit, a three-phase five-column voltage transformer, a distribution automation unit and a marketing unit;

[0006] The three-phase five-column voltage transformer is installed on the power supply side of the 10kV line boundary switch to measure the three-phase voltage and zero-sequence voltage of the line and output the voltage to the circuit breaker control unit and the electric energy metering unit;

[0007] The electric energy metering unit is installed at the boundary switch and is used to collect line voltage and current, calculate the power consumption of the boundary user, and output the calculated result of the user power consumption to the circuit breaker control unit; and after receiving the user payment signal output by the marketing unit, it sends a payment closing pulse signal to the circuit breaker control unit;

[0008] The circuit breaker control unit is installed at the boundary switch and is used to monitor the line voltage and current in real time, and control the opening and closing of the boundary switch according to the voltage and current; and receive the remote control signal output by the distribution automatic unit, the user power calculation result output by the power metering unit and the payment closing pulse signal to control the opening and closing of the boundary switch.

[0009] The above-mentioned electric energy metering unit includes a data processing module, an electric energy metering module, a voltage and current sampling module, a backup power supply module, a power supply module 1, a data storage module, a dot matrix LCD screen, an Ethernet port / serial port, and a fee control interface; the data processing module is respectively connected to the electric energy metering module, the power supply module 1, the data storage module, the dot matrix LCD screen, the Ethernet port / serial port, and the fee control interface; the voltage and current sampling module is connected to the electric energy metering module; and the backup power supply module is connected to the power supply module 1.

[0010] The above-mentioned circuit breaker control unit includes a main control module, an input and output module, a human-computer interaction module, a supercapacitor, a communication module, and a second power supply module; the input and output module, the human-computer interaction module, the communication module, and the second power supply module are all connected to the main control module; the supercapacitor, the input and output module, and the communication module are all connected to the second power supply module.

[0011] The above-mentioned main control module includes a CPU, a power supply interface, a communication module interface, a communication / remote control interface, a voltage sampling circuit and interface, and a current sampling circuit and interface; the power supply interface, the communication module interface, the communication / remote control interface, the voltage sampling circuit and interface, and the current sampling circuit and interface are all connected to the CPU.

[0012] The above-mentioned circuit breaker control unit is connected to the three-phase five-column voltage transformer through an 8-core voltage aviation plug; the circuit breaker control unit is connected to the boundary switch through a 24-core aviation plug; the circuit breaker control unit is connected to the electric energy metering unit through a 4-core current aviation plug and a 3-core fee control aviation plug; the electric energy metering unit is connected to the three-phase five-column voltage transformer through a 6-core voltage aviation plug.

[0013] The second technical solution of the present invention is achieved by the following method: a method for integrating 10kV line boundary switch control and electric energy metering, comprising the following steps:

[0014] Install the three-phase five-column voltage transformer on the power supply side of the 10kV line boundary switch;

[0015] Install the circuit breaker control unit and the electric energy metering unit at the boundary switch;

[0016] The circuit breaker control unit collects analog quantities and opening and closing position information of the line at the boundary switch, monitors the operating status of the boundary switch in real time, and controls the opening and closing of the boundary switch based on the analog quantity information; the analog quantities include voltage, current, power, and frequency;

[0017] The electric energy metering unit collects the voltage and current at the boundary switch and calculates the electricity consumption of the boundary user. When it is calculated that the user is in arrears, it outputs an arrears trip pulse signal to the circuit breaker control unit, and the circuit breaker control unit controls the boundary switch to open;

[0018] After receiving the user's payment signal, the marketing system outputs it to the power metering unit. The power metering unit sends a payment closing pulse signal to the circuit breaker control unit, and the circuit breaker control unit controls the boundary switch to close.

[0019] The above-mentioned control of the opening and closing of the boundary switch according to the analog information includes:

[0020] The circuit breaker control unit judges the collected analog quantity to determine whether there is any abnormality in the analog quantity;

[0021] In response to the above, a fault occurs in the line, and the circuit breaker control unit controls the boundary switch to open, isolating the fault area;

[0022] The distribution automation unit determines whether the line fault is cleared, and in response, outputs a remote control signal to the circuit breaker control unit, which controls the boundary switch to close.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1. The present invention unifies the user boundary switch control equipment and the high-voltage metering equipment into a set of devices, that is, by setting the circuit breaker control unit and the electric energy metering unit to be installed at the boundary switch. The device has a simple structure and is easy to install, avoiding the problem of wiring errors caused by a complicated wiring process and improving the installation efficiency of the on-site installation equipment.

[0025] 2. The present invention adopts a set of three-phase five-column voltage transformers. Compared with the two sets of voltage and current transformers configured at the original high-voltage boundary users, this method uses only one set of voltage and current transformers to achieve voltage and current collection and electric energy metering requirements at the boundary switch, realizing the integration of measurement, metering and protection, saving equipment investment and improving the convenience of on-site installation.

[0026] 3. The present invention connects the marketing unit and the electric energy metering unit with a 3-core fee control plug to realize the functions of automatic disconnection and power supply when the boundary users are in arrears and automatic closing and power supply when they pay, thereby further standardizing the electricity management of the boundary users. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] Figure 1 This is a circuit block diagram of embodiment 1 of the present invention.

[0029] Figure 2 This is a circuit block diagram of the circuit breaker control unit in Example 1 of the present invention.

[0030] Figure 3 This is a circuit block diagram of the main control module in Example 1 of the present invention.

[0031] Figure 4 This is a circuit block diagram of the electric energy metering unit in Example 1 of the present invention.

[0032] Figure 5 This is a flow chart of the method of Example 2 of the present invention. DETAILED DESCRIPTION

[0033] The present invention is not limited to the following embodiments, and specific implementation methods can be determined based on the technical solutions of the present invention and actual conditions.

[0034] Example 1: Figure 1 As shown, the embodiment of the present invention discloses a 10kV line boundary switch control and electric energy metering fusion device, including a circuit breaker control unit, a boundary switch, an electric energy metering unit, a three-phase five-column voltage transformer, a distribution automation unit and a marketing unit;

[0035] The three-phase five-column voltage transformer is installed on the power supply side of the 10kV line boundary switch to measure the three-phase voltage and zero-sequence voltage of the line and output the voltage to the circuit breaker control unit and the electric energy metering unit;

[0036] The electric energy metering unit is installed at the boundary switch and is used to collect line voltage and current, calculate the power consumption of the boundary user, and output the calculated result of the user power consumption to the circuit breaker control unit; and after receiving the user payment signal output by the marketing unit, it sends a payment closing pulse signal to the circuit breaker control unit;

[0037] The circuit breaker control unit is installed at the boundary switch and is used to monitor the line voltage and current in real time, and control the opening and closing of the boundary switch according to the voltage and current; and receive the remote control signal output by the distribution automatic unit, the user power calculation result output by the power metering unit and the payment closing pulse signal to control the opening and closing of the boundary switch.

[0038] Among them, the boundary switch can be a pole-mounted circuit breaker, including a current transformer, installed on a 10kV line, and its opening and closing are controlled by a circuit breaker control unit.

[0039] like Figure 4As shown, the electric energy metering unit includes a data processing module, an electric energy metering module, a voltage and current sampling module, a backup power supply module, a power supply module 1, a data storage module, a dot matrix LCD screen, an Ethernet port / serial port, and a fee control interface; the data processing module is respectively connected to the electric energy metering module, the power supply module 1, the data storage module, the dot matrix LCD screen, the Ethernet port / serial port, and the fee control interface; the voltage and current sampling module is connected to the electric energy metering module; and the backup power supply module is connected to the power supply module 1.

[0040] Among them, the voltage and current sampling module is used to collect the three-phase voltage and current of the line, and output the voltage and current to the power metering module; the power metering module calculates the electric energy consumed by the boundary user based on the received voltage and current, and sends it to the data processing module. The data processing module outputs payment and arrears information to the circuit breaker control unit based on the user's electric energy.

[0041] The backup power module serves as a backup battery, providing 24V DC voltage to the power module 1, and is used to power the entire energy metering unit when the line is out of power.

[0042] Among them, the data processing module is responsible for processing and analyzing electrical energy, forming various types of data information and uploading the information to the marketing system through the communication interface. The communication interface provides the data processing module with communication channels such as infrared and RS485 serial port; the data processing module is also connected to the circuit breaker control unit through the fee control interface, which is used to transmit payment and arrears information to the circuit breaker control unit. The circuit breaker control unit controls the opening and closing of the boundary switch according to the received information, thereby realizing the arrears opening and payment closing functions of the entire device.

[0043] Among them, the dot matrix LCD screen is connected to the data processing module, which can intuitively display various data information in the power calculation unit for on-site personnel to review; the data storage module is used to store various parameters, power and historical data in the power calculation unit.

[0044] like Figure 2 As shown, the circuit breaker control unit includes a main control module, an input and output module, a human-computer interaction module, a supercapacitor, a communication module, and a power supply module 2; the input and output module, the human-computer interaction module, the communication module, and the power supply module 2 are all connected to the main control module; the supercapacitor, the input and output module, and the communication module are all connected to the power supply module 2.

[0045] Among them, the main control module is used to collect, analyze and calculate analog quantities such as voltage and current, and upload the calculation results and the opening and closing position information of the boundary switch in the form of digital quantities through communication module 2 to the distribution automation unit, and control the opening and closing of the boundary switch according to the calculation results.

[0046] Among them, the input and output module is connected to the main control module through the FC serial data line. It is responsible for converting the opening and closing position voltage pulse signal of the boundary switch into a digital output to the main control module, and receiving the opening and closing instructions sent by the main control module to realize the opening and closing actions of the boundary switch.

[0047] Among them, the human-machine interaction module is connected to the main control module through an FC serial data line. The LCD screen of the human-machine interaction module can intuitively display various data information in the circuit breaker control unit for on-site personnel to review. At the same time, the operation buttons on the human-machine interaction module allow on-site personnel to modify various parameter settings in the circuit breaker control unit on site.

[0048] Among them, power module 2 can convert 220V AC voltage into 24V DC voltage to power the main control module, input and output module, communication module and supercapacitor. When the line has power, the power module charges the supercapacitor. After the line is powered off, the supercapacitor serves as a backup battery or 24V stable DC voltage to provide 24V DC voltage for power module 2, thereby powering the entire circuit breaker control unit.

[0049] Among them, the communication module is connected to the main control module through the network port / serial port, contains a SIM card, has 4G / 5G communication function, can receive various data information transmitted by the main control module and send the information to the distribution automation unit.

[0050] like Figure 3 As shown, the main control module includes a CPU, a power supply interface, a communication module interface, a communication / remote control interface, a voltage sampling circuit and interface, and a current sampling circuit and interface; the power supply interface, the communication module interface, the communication / remote control interface, the voltage sampling circuit and interface, and the current sampling circuit and interface are all connected to the CPU.

[0051] Among them, the voltage sampling circuit and interface and the current sampling circuit and interface are connected to the line on the boundary switch side to collect the voltage and current of the line respectively, and output the collected voltage and current to the CPU; the CPU calculates the voltage and current, and uploads the calculation results to the distribution automation unit through the communication / remote control interface. In addition, the CPU can also output the opening and closing pulse signals to the input and output module based on the calculation results; the power interface is connected to the power module 2 to supply power to the CPU.

[0052] like Figure 1 As shown, the circuit breaker control unit is connected to the three-phase five-column voltage transformer through an 8-core voltage aviation plug; the circuit breaker control unit is connected to the boundary switch through a 24-core aviation plug; the circuit breaker control unit is connected to the electric energy metering unit through a 4-core current aviation plug and a 3-core charge control aviation plug; the electric energy metering unit is connected to the three-phase five-column voltage transformer through a 6-core voltage aviation plug.

[0053] Among them, the three-phase five-pole voltage transformer includes an 8-core voltage aviation plug, which is connected to the line to measure the three-phase voltage and zero-sequence voltage of the line, and provides data for collection by the circuit breaker control unit and the electric energy metering unit. Its collection accuracy is ±0.2%. At the same time, the three-phase five-pole voltage transformer provides AC 220V power supply voltage for the circuit breaker control unit and the electric energy metering unit.

[0054] Among them, the electric energy metering unit and the circuit breaker control unit are connected through a 3-core fee control plug, which is used to transmit the payment closing pulse signal issued by the marketing unit to the circuit breaker control unit.

[0055] Example 2: Figure 5 As shown, the embodiment of the present invention discloses a method for integrating 10kV line boundary switch control and electric energy metering, comprising the following steps:

[0056] S101, install the three-phase five-column voltage transformer on the power supply side of the 10kV line boundary switch;

[0057] S102, installing the circuit breaker control unit and the electric energy metering unit at the boundary switch;

[0058] S103: The circuit breaker control unit collects analog quantities and opening and closing position information of the line at the boundary switch, monitors the operating status of the boundary switch in real time, and controls the opening and closing of the boundary switch based on the analog quantity information; wherein the analog quantities include voltage, current, power, and frequency;

[0059] S104: The electric energy metering unit collects the voltage and current at the boundary switch and calculates the electricity consumption of the boundary user. When it is calculated that the user is in arrears, it outputs an arrears trip pulse signal to the circuit breaker control unit, which controls the boundary switch to open.

[0060] S105, after receiving the user's payment signal, the marketing system outputs it to the power metering unit, and the power metering unit sends a payment closing pulse signal to the circuit breaker control unit, and the circuit breaker control unit controls the boundary switch to close.

[0061] Among them, in step S103, controlling the opening and closing of the boundary switch according to the analog information includes:

[0062] The circuit breaker control unit judges the collected analog quantity to determine whether there is any abnormality in the analog quantity;

[0063] In response to the above, a fault occurs in the line, and the circuit breaker control unit controls the boundary switch to open, isolating the fault area;

[0064] The distribution automation unit determines whether the line fault is cleared, and in response, outputs a remote control signal to the circuit breaker control unit, which controls the boundary switch to close.

[0065] As mentioned above, the judgment of whether the analog quantity is abnormal is mainly based on the collected voltage and current. If the collected current value is the fault current value set by the high-voltage circuit breaker control unit, it is determined that a short circuit or ground fault has occurred in the circuit; or if the collected voltage value is lower than the normal voltage value set by the circuit breaker control unit, it is determined that a low voltage or disconnection fault has occurred in the line.

[0066] The above-mentioned distribution automation unit determines whether the line fault is resolved. Specifically, when the on-site staff completes the fault repair, the line voltage and current and other analog quantities return to normal values. When the circuit breaker control unit detects that the voltage and current values ​​are within the normal range, the voltage and current values ​​are uploaded to the distribution automation unit. The distribution automation unit determines that the fault is resolved and outputs a remote control signal to the circuit breaker control unit. Among them, the distribution automation unit can automatically output the remote control signal, or the staff can manually control the remote control signal.

[0067] Among them, in step S104, the calculation of the user's arrears is specifically that the electric energy metering unit collects the voltage and current at the boundary switch, and calculates the boundary user's electricity consumption based on the voltage and current. When it is calculated that the cost of the user's current electricity consumption exceeds the electricity bill paid by the user, it is determined that the user is in arrears. At the same time, the electric energy metering unit outputs an arrears trip pulse signal to the circuit breaker control unit, and the circuit breaker control unit controls the boundary switch to trip. At this time, the power supply to the user is interrupted.

[0068] Among them, in step S105, after the user pays, the marketing unit receives the payment information and outputs a signal to the electricity metering unit, which sends a payment closing pulse signal to the circuit breaker control unit to control the boundary switch to close. At this time, the user's power supply is restored.

[0069] In summary, the present invention designs the user boundary switch control equipment and the high-voltage metering equipment into a set of devices, that is, by setting the circuit breaker control unit and the electric energy metering unit to be installed at the boundary switch. The device has a simple structure and is easy to install, avoiding the problem of wiring errors caused by a complicated wiring process and improving the installation efficiency of the on-site installation equipment.

[0070] In addition, the present invention adopts a set of three-phase five-column voltage transformers. Compared with the two sets of voltage and current transformers configured at the original high-voltage boundary users, this method uses only one set of voltage and current transformers to achieve voltage and current collection and electric energy metering requirements at the boundary switch, realizing the integration of measurement, metering and protection, saving equipment investment and improving the convenience of on-site installation.

[0071] Furthermore, the present invention realizes the functions of automatic disconnection and power supply when users in arrears pay and automatic closing and power supply when paying by setting a 3-core fee-control plug connection between the marketing unit and the electric energy metering unit, thereby further standardizing the electricity management of users in arrears.

Claims

1. A 10kV line boundary switch control and electric energy metering fusion device, characterized in that: It includes circuit breaker control unit, boundary switch, energy metering unit, three-phase five-column voltage transformer, distribution automation unit and marketing unit; The three-phase five-column voltage transformer is installed on the power supply side of the 10kV line boundary switch to measure the three-phase voltage and zero-sequence voltage of the line and output the voltage to the circuit breaker control unit and the electric energy metering unit; The electric energy metering unit is installed at the boundary switch to collect line voltage and current, calculate the boundary user power consumption, and output the calculated result of the user power consumption to the circuit breaker control unit; And after receiving the user payment signal output by the marketing unit, it sends a payment closing pulse signal to the circuit breaker control unit; The circuit breaker control unit is installed at the boundary switch to monitor the line voltage and current in real time, and control the opening and closing of the boundary switch according to the voltage and current; And receive the remote control signal output by the power distribution automatic unit, the user power calculation result output by the power metering unit and the payment closing pulse signal to control the opening and closing of the boundary switch; The electric energy metering unit includes a data processing module, an electric energy metering module, a voltage and current sampling module, a backup power supply module, a power supply module 1, a data storage module, a dot matrix LCD screen, an Ethernet port / serial port, and a fee control interface; the data processing module is respectively connected to the electric energy metering module, the power supply module 1, the data storage module, the dot matrix LCD screen, the Ethernet port / serial port, and the fee control interface; the voltage and current sampling module is connected to the electric energy metering module; and the backup power supply module is connected to the power supply module 1; The circuit breaker control unit includes a main control module, an input / output module, a human-computer interaction module, a supercapacitor, a communication module, and a second power module; the input / output module, the human-computer interaction module, the communication module, and the second power module are all connected to the main control module; the supercapacitor, the input / output module, and the communication module are all connected to the second power module; The demarcation switch is a pole-mounted circuit breaker that includes a current transformer and is installed on a 10kV line. Its opening and closing are controlled by a circuit breaker control unit.

2. The 10kV line boundary switch control and electric energy metering fusion device according to claim 1 is characterized in that: The main control module includes a CPU, a power supply interface, a communication module interface, a communication / remote control interface, a voltage sampling circuit and interface, and a current sampling circuit and interface; the power supply interface, the communication module interface, the communication / remote control interface, the voltage sampling circuit and interface, and the current sampling circuit and interface are all connected to the CPU.

3. The 10kV line boundary switch control and electric energy metering fusion device according to claim 1 or 2, characterized in that: The circuit breaker control unit and the three-phase five-column voltage transformer are connected through an 8-core voltage aviation plug; the circuit breaker control unit and the boundary switch are connected through a 24-core aviation plug; the circuit breaker control unit and the electric energy metering unit are connected through a 4-core current aviation plug and a 3-core fee control aviation plug; the electric energy metering unit and the three-phase five-column voltage transformer are connected through a 6-core voltage aviation plug.

4. The 10kV line boundary switch control and electric energy metering fusion device according to claim 3 is characterized in that: The circuit breaker control unit and the three-phase five-column voltage transformer are connected through an 8-core voltage aviation plug; the circuit breaker control unit and the boundary switch are connected through a 24-core aviation plug; the circuit breaker control unit and the electric energy metering unit are connected through a 4-core current aviation plug and a 3-core fee control aviation plug; the electric energy metering unit and the three-phase five-column voltage transformer are connected through a 6-core voltage aviation plug.

5. A 10kV line boundary switch control and electric energy metering fusion method using the 10kV line boundary switch control and electric energy metering fusion device according to any one of claims 1 to 4, characterized in that: The following steps are involved: Install the three-phase five-column voltage transformer on the power supply side of the 10kV line boundary switch; Install the circuit breaker control unit and the electric energy metering unit at the boundary switch; The circuit breaker control unit collects analog quantities and opening and closing position information of the line at the boundary switch, monitors the operating status of the boundary switch in real time, and controls the opening and closing of the boundary switch based on the analog quantity information; the analog quantities include voltage, current, power, and frequency; The electric energy metering unit collects the voltage and current at the boundary switch and calculates the electricity consumption of the boundary user. When it is calculated that the user is in arrears, it outputs an arrears trip pulse signal to the circuit breaker control unit, and the circuit breaker control unit controls the boundary switch to open; After receiving the user's payment signal, the marketing system outputs it to the power metering unit. The power metering unit sends a payment closing pulse signal to the circuit breaker control unit, and the circuit breaker control unit controls the boundary switch to close.

6. The 10kV line boundary switch control and electric energy metering integration method according to claim 5 is characterized in that: The method of controlling the opening and closing of the boundary switch according to the analog information includes: The circuit breaker control unit judges the collected analog quantity to determine whether there is any abnormality in the analog quantity; In response to the above, a fault occurs in the line, and the circuit breaker control unit controls the boundary switch to open, isolating the fault area; The distribution automation unit determines whether the line fault is cleared, and in response, outputs a remote control signal to the circuit breaker control unit, which controls the boundary switch to close.

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