CN107422162A - A kind of intelligent current limliting based on current transformer sampling takes control open-circuit system and method - Google Patents

Abstract

The invention discloses an intelligent current-limiting fee-controlled circuit breaker system and method based on current transformer sampling. The system includes a circuit breaker body, a reclosing module, a sampling module, a control module, a power supply module, a human-computer interaction module, and a communication module. and a data storage module; the circuit breaker body includes a current sensor, the current sensor collects the current signal of the circuit breaker body and sends it to the sampling module, and the current signal is conditioned by the module and sent to the control module, and the control module sends the current signal to the sampling module The current signal is A/D converted into a current digital signal, and the current digital signal is compared with the preset threshold value. If the current digital signal is higher than the preset threshold value, the control module controls the reclosing module to re-distribute the circuit breaker body. When the user successfully pays the fee, the circuit breaker body automatically closes; the method and system meet the basic electricity demand of the user before renewal, and make the user's electricity experience more intelligent and humanized.

Description

A system and method for intelligent current-limiting and fee-controlled circuit breaking based on current transformer sampling

technical field

The invention relates to the field of intelligent low-voltage power distribution, and more specifically, to an intelligent current-limiting and fee-controlled circuit breaking system and method based on current transformer sampling.

Background technique

In the low-voltage power distribution system, intelligent protection and intelligent power consumption are becoming more and more important. The safety and convenience requirements of power supply enterprises and users for smart meters are also constantly increasing, and my country attaches great importance to the technological development of smart meters. The quality and reliability of load switches for electric energy meters are highly valued. As an important measuring instrument for smart grids, smart electric energy meters not only have the basic functions of traditional electricity metering, but also have electricity information storage, two-way multi-rate metering, and user-end Functions such as control, two-way data communication with multiple data transmission modes, and anti-stealing are the future development direction of energy-saving smart grid intelligence. The State Grid Corporation of China has formulated the "Technical Specifications for External Circuit Breakers for Electric Energy Meters", which regulates the technical requirements for a special miniature circuit breaker associated with smart electric energy meters. The new type of electric energy meter external circuit breaker not only improves the reliability of the electric energy meter fee control system, but also ensures the safe and stable operation of the intelligent management and service of the power system. However, this kind of electric energy meter external circuit breaker lacks an early warning system. When the user fails to pay the electricity bill in time or for other special reasons, the user will not be able to continue to use electricity, which will have a certain impact on the basic life of the user.

Contents of the invention

In order to solve the problem that existing circuit breakers in the background technology cut off electricity without paying the electricity fee, the present invention provides an intelligent current-limiting fee-controlled circuit breaking system and method based on current transformer sampling. The system and method Add a certain current-limiting function to the existing circuit breaker for humanized power consumption management, and when arrears occur, it can also meet the basic power consumption needs of users before payment;

The intelligent current-limiting and fee-controlled circuit breaking system based on current transformer sampling includes:

A circuit breaker body, the circuit breaker body includes a current transformer, the circuit breaker body is used to perform circuit opening and closing operations, and the current transformer is used to sample the current of the circuit breaker body;

A reclosing module, the reclosing module is used for reclosing or opening the circuit breaker body;

A sampling module, the sampling module is connected to the circuit breaker body and the control module, the sampling module receives the sampling current value of the current transformer of the circuit breaker body and performs signal conditioning, and sends the conditioned sampling current signal to the control module;

A control module, the control module is used to process the sampling current signal of the sampling module, and is used to control the reclosing module to open or close; the processing of the sampling current signal of the sampling module refers to combining the adjusted sampling current signal with the preset Compared with the specified threshold;

The power module is used to supply power to the system when the switch is opened for the first time.

Further, the reclosing module includes a drive circuit, a DC motor and a gear, the gear is connected to the circuit breaker switch, and the circuit breaker switch can be controlled to open and close through the rotation of the gear, and the control module sends an opening or closing signal to the reclosing module. Brake command, the drive circuit drives the DC motor to drive the gear transmission to make the circuit breaker open or close;

Further, the control module includes an MCU chip, and the MCU chip is used to convert the conditioned sampling current signal into a sampling current digital signal, and compare the sampling current digital signal with a preset current threshold, according to The comparison result sends an operation instruction to the reclosing module;

Further, the system includes a communication module, which enables the control unit to communicate with external devices, and the communication module includes RS485 or power carrier system;

Further, the system includes a human-computer interaction module, the human-computer interaction module includes an input keyboard, the human-computer interaction module is connected to the control module, and is used to set the current threshold according to requirements;

Further, the system includes a data storage module, and the control unit includes a metering chip; the metering chip is used to record the metering result and the working state of the circuit breaker, and the data storage module is used to record the metering chip The measurement results and the working status of the circuit breaker are stored;

Further, the circuit breaker body includes a handle, an arc extinguishing system, and successively connected incoming wire terminals, a thermal trip system, an operating mechanism, an electromagnetic system, a current transformer, and an outgoing wire terminal, and the handle is connected to the operating mechanism.

The described intelligent current-limiting and cost-controlling circuit breaking method based on current transformer sampling includes:

Step 1, the user's electricity bill is in arrears, and the circuit breaker body is opened according to the arrears opening instruction;

Step 2, the power supply module supplies power to the system, and the reclosing module performs closing operation on the circuit breaker body;

Step 3, the sampling module receives the current value sampled by the current transformer of the re-closed circuit breaker body, and sends the sampling result to the control module after conditioning;

Step 4, the control module compares the sampling current value of the sampling module with the preset current threshold value, when the sampling current value exceeds the preset current threshold value, the control module sends an opening command to the reclosing module, and the reclosing module sends an opening command to the circuit breaker The main body performs the opening operation; the circuit breaker main body is in a locked state after opening;

Step 5, after the user completes the payment, the circuit breaker body is automatically closed, and the power module no longer supplies power to the system;

Furthermore, the user completes the payment before the sampled current value exceeds the preset current threshold, the power module will no longer supply power to the system, and the circuit breaker will automatically remain closed;

Further, the reclosing module includes a drive circuit, a DC motor and a gear, the gear is connected to the circuit breaker switch, and the circuit breaker switch can be controlled to open and close through the rotation of the gear, and the control module sends an opening or closing signal to the reclosing module. Brake command, the drive circuit drives the DC motor to drive the gear transmission to make the circuit breaker open or close;

Further, the control module includes an MCU chip, and the MCU chip is used to convert the conditioned sampling current signal into a sampling current digital signal, and compare the sampling current digital signal with a preset current threshold, according to The comparison result sends an operation instruction to the reclosing module.

The beneficial effects of the present invention are: the technical scheme of the present invention provides an intelligent current-limiting sub-control circuit breaking system and method based on current transformer sampling. The basic power demand before the renewal, and at the same time, the statistics of the user's power consumption after automatic closing are made, and the threshold is set for control. When the extra power consumption exceeds the threshold, the circuit breaker will open again to avoid illegal personnel Use this humanized design to steal electricity and lay a solid foundation for a more intelligent and humanized electricity experience in the future.

Description of drawings

A more complete understanding of the exemplary embodiments of the present invention can be had by referring to the following drawings:

Fig. 1 is a structural diagram of an intelligent current-limiting fee-controlled circuit breaking system based on current transformer sampling according to a specific embodiment of the present invention;

2 is a schematic diagram of a circuit breaker body including a current transformer according to a specific embodiment of the present invention; and

Fig. 3 is a flow chart of an intelligent current-limiting and fee-controlled circuit breaking method based on current transformer sampling according to a specific embodiment of the present invention.

detailed description

Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units/elements are provided with the same reference numerals.

Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or overly formal meanings.

Fig. 1 is a structural diagram of an intelligent current-limiting and fee-controlled circuit breaking system based on current transformer sampling according to a specific embodiment of the present invention. The system in this embodiment includes a circuit breaker body 101, a reclosing module 102, a sampling module 103, A control module 104, a power supply module 105, a human-computer interaction module 106, a communication module 107 and a data storage module 108;

The circuit breaker body 101 is connected to the power grid, and is used to execute opening and closing instructions to control whether to supply power to users. The circuit breaker body 101 has a built-in current transformer 1011, and the current transformer 1011 is used to sample the current flowing through the circuit breaker. , the output terminal of the current transformer 1011 is connected to the input terminal of the sampling module 103, and when the system is enabled, the current transformer 1011 sends the collected circuit breaker current signal to the sampling module 103;

The sampling module 103 is used for receiving the current sampling signal of the current transformer 1011, and conditioning the current sampling signal, and sending the conditioned current sampling signal to the control module 104;

The control module 104 includes an MCU chip 1041 and a metering chip 1042. The MCU chip 1041 receives the current sampling signal sent by the sampling module 103, A/D converts the current sampling signal into a current sampling digital signal, and converts the current sampling digital signal into a current sampling digital signal. The signal is compared with a preset current threshold, and if the current sampling digital signal exceeds the preset current threshold, the control module sends a reclosing command to the reclosing module;

The control module 104 is connected to the human-computer interaction module 106, and the human-computer interaction module 106 includes an input keyboard for setting the current threshold according to requirements;

The control module 104 is connected with the communication module 107, and the communication module enables the control unit to communicate with external devices, and the communication module includes RS485 or power carrier system;

The metering chip 1042 receives the current sampling signal sent by the sampling module 103. The metering chip 1042 is connected to the data storage module 108. The metering chip 1042 is used to record the metering results and the working status of the circuit breaker. The data storage module 108 is used to store the metering results recorded by the metering chip 1042 and the working status of the circuit breaker;

The control module 104 is connected to the reclosing module 102, and the reclosing module 102 is mechanically connected to the circuit breaker body using a gear transmission. The reclosing module 102 includes a drive circuit, a DC motor and a gear, and the gear is connected to the circuit breaker body The electric brakes are connected, and the electric brakes of the circuit breaker body can be controlled to open and close through the rotation of the gears. The control module sends an opening or closing command to the reclosing module, and the driving circuit drives the DC motor to drive the gear transmission to open or close the circuit breaker;

Further, as shown in FIG. 2, a schematic diagram of a circuit breaker body including a current transformer according to a specific embodiment of the present invention; the circuit breaker body 101 includes a handle 201, an arc extinguishing system 202, and incoming line terminals 203 connected in sequence , a thermal tripping system 204 , an operating mechanism 205 , an electromagnetic system 206 , a current transformer 1011 , and an outlet terminal 207 , and the handle 201 is connected to the operating mechanism 205 .

Fig. 3 is an intelligent current-limiting and fee-controlled disconnection method based on current transformer sampling according to a specific embodiment of the present invention. The method can realize humanized management when the user is in arrears, and continue to supply part of the electricity until the user pays the fee in time. Affect their basic electricity needs by:

Step 301, the user's electricity bill is in arrears, and the circuit breaker body is opened according to the arrears opening instruction;

Step 302, the power supply module supplies power to the system, and the reclosing module performs closing operation on the circuit breaker body;

Step 303, the sampling module receives the current value sampled by the current transformer of the reclosed circuit breaker body, and sends the sampling result to the control module after conditioning;

Step 304, the control module compares the sampling current value of the sampling module with the preset current threshold value, when the sampling current value exceeds the preset current threshold value, the control module sends an opening command to the reclosing module, and the reclosing module sends an opening command to the circuit breaker The main body performs the opening operation; the circuit breaker main body is in a locked state after opening;

Step 305, after the user completes the payment, the circuit breaker body is automatically closed, and the power module no longer supplies power to the system;

Furthermore, the user completes the payment before the sampled current value exceeds the preset current threshold, the power module will no longer supply power to the system, and the circuit breaker will automatically remain closed;

Further, the reclosing module includes a drive circuit, a DC motor and a gear, the gear is connected to the circuit breaker switch, and the circuit breaker switch can be controlled to open and close through the rotation of the gear, and the control module sends an opening or closing signal to the reclosing module. Brake command, the drive circuit drives the DC motor to drive the gear transmission to make the circuit breaker open or close;

Further, the control module includes an MCU chip, and the MCU chip is used to convert the conditioned sampling current signal into a sampling current digital signal, and compare the sampling current digital signal with a preset current threshold, according to The comparison result sends an operation instruction to the reclosing module.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (11)

1. An intelligent current-limiting fee control circuit breaking system based on current transformer sampling, said system comprising: A circuit breaker body, the circuit breaker body includes a current transformer, the circuit breaker body is used to perform circuit opening and closing operations, and the current transformer is used to sample the current of the circuit breaker body; A reclosing module, the reclosing module is used for reclosing or opening the circuit breaker body; A sampling module, the sampling module is connected to the circuit breaker body and the control module, the sampling module receives the sampling current value of the current transformer of the circuit breaker body and performs signal conditioning, and sends the conditioned sampling current signal to the control module; A control module, the control module is used to process the sampling current signal of the sampling module, and is used to control the reclosing module to open or close; the processing of the sampling current signal of the sampling module refers to combining the adjusted sampling current signal with the preset Compared with the specified threshold; The power module is used to supply power to the system when the switch is opened for the first time. 2. The system according to claim 1, characterized in that: the reclosing module includes a drive circuit, a DC motor and a gear, the gear is connected to the circuit breaker switch, and the switch of the circuit breaker switch can be controlled by the rotation of the gear, so The control module sends an opening or closing command to the reclosing module, and the driving circuit drives the DC motor to drive the gear transmission to open or close the circuit breaker. 3. The system according to claim 1, wherein the control module comprises an MCU chip, and the MCU chip is used for converting the conditioned sampling current signal into a sampling current digital signal, and converting the sampling current digital signal Compared with the preset current threshold, an operation instruction is sent to the reclosing module according to the comparison result. 4. The system according to claim 1, characterized in that: the system includes a communication module, the communication module enables the control unit to communicate with external devices, and the communication module includes RS485 or power carrier system. 5. The system according to claim 1, characterized in that: the system includes a human-computer interaction module, the human-computer interaction module includes an input keyboard, and the human-computer interaction module is connected to the control module for setting fixed current threshold. 6. The system according to claim 3, characterized in that: the system includes a data storage module, the control unit includes a metering chip; the metering chip is used to record the metering results and the working status of the circuit breaker, the The data storage module is used to store the metering results recorded by the metering chip and the working status of the circuit breaker. 7. The system according to claim 1, characterized in that: the circuit breaker body includes a handle, an arc extinguishing system and successively connected incoming line terminals, thermal tripping system, operating mechanism, electromagnetic system, current transformer, outgoing line terminal, and the handle is connected with the operating mechanism. 8. An intelligent current-limiting and fee-controlled breaking method based on current transformer sampling, the method comprising: Step 1, the user's electricity bill is in arrears, and the circuit breaker body is opened according to the arrears opening instruction; Step 2, the power supply module supplies power to the system, and the reclosing module performs closing operation on the circuit breaker body; Step 3, the sampling module receives the current value sampled by the current transformer of the re-closed circuit breaker body, and sends the sampling result to the control module after conditioning; Step 4, the control module compares the sampling current value of the sampling module with the preset current threshold value, when the sampling current value exceeds the preset current threshold value, the control module sends an opening command to the reclosing module, and the reclosing module sends an opening command to the circuit breaker The main body performs the opening operation; the circuit breaker main body is in a locked state after opening; Step 5, after the user completes the payment, the circuit breaker body is automatically closed, and the power module no longer supplies power to the system. 9. The method according to claim 8, wherein the user completes the payment before the sampled current value exceeds the preset current threshold, the power module no longer supplies power to the system, and the circuit breaker automatically remains closed. 10. The method according to claim 8, characterized in that: the reclosing module includes a drive circuit, a DC motor and a gear, the gear is connected to the circuit breaker switch, and the circuit breaker switch can be controlled by the rotation of the gear Opening and closing, the control module sends an opening or closing command to the reclosing module, and the drive circuit drives the DC motor to drive the gear transmission to open or close the circuit breaker. 11. The method according to claim 8, characterized in that: the control module comprises an MCU chip, and the MCU chip is used to convert the conditioned sampling current signal into a sampling current digital signal, and convert the sampling current digital signal Compared with the preset current threshold, an operation instruction is sent to the reclosing module according to the comparison result.