Intelligent circuit breaker control system and control method

Abstract

The invention discloses an intelligent circuit breaker control system and a control method. The control system comprises a plurality of sensors, a core processor, a man-machine interaction module, a communication module, a photoelectric isolation module, a power supply module, an action mechanism, a clock module and a storage module, the current sensor and the voltage sensor collect current signals and voltage signals in a loop, the current signals and the voltage signals are converted by the A / D converter, and digital signals are output to the core processor; the displacement sensor collects the displacement of the main contact of the circuit breaker to obtain an opening and closing signal of the circuit breaker, and the opening and closing signal is input into the core processor through the photoelectric isolation module to judge whether the circuit breaker breaks down. If the fault is judged, the core processor outputs an action signal, the action mechanism acts, and the circuit breaker breaks the fault; the information is displayed on a local man-machine interaction LCD interface and an alarm is given out; according to the invention, intelligent control and intelligent protection of the circuit breaker are realized, the working state of the circuit breaker can be quickly and remotely known in real time, the problems that the fault of the circuit breaker cannot be known in time and the fault signal of the circuit breaker is difficult to collect due to the problems of distance and the like are greatly reduced, and the intellectualization and high efficiency of the circuit breaker are met to the greatest extent.

Description

Technical Field

[0001] The present invention belongs to the technical field of circuit breakers, and in particular relates to an intelligent circuit breaker control system and a control method. Background Art

[0002] As an indispensable part of the power sector, circuit breakers play an important role in ensuring the safe and stable operation of power systems. With the continuous development and progress of the power industry, traditional circuit breakers can no longer meet the increasingly diversified application scenarios and application functions, and higher performance requirements are also placed on traditional circuit breakers. Therefore, the intelligentization of traditional circuit breakers is imminent. As the core part of the circuit breaker, the control system has developed a smart circuit breaker control system with high universality, convenient operation, intelligence and other functions, which is of vital importance to the development of the national power industry and the circuit breaker market.

[0003] When circuit breakers are used in power systems, when overload, short circuit or other faults occur in the circuit, that is, when the voltage or current value in the circuit reaches the initial threshold of the circuit breaker, the circuit breaker cuts off the faulty part of the circuit to prevent the fault problem in the circuit from further expanding and affecting the normal and stable operation of the circuit. However, in actual applications, the aging and wear of parts will cause the circuit breaker to trip delayed, seriously affecting the safe operation of other equipment in the circuit.

[0004] Existing intelligent circuit breakers have problems such as slow control system response speed, insufficient response capability, and insensitive disconnection and closing response, which are the culprits of power failure problems. At present, common circuit breakers are based on single-core control systems or cumbersome dual-core control systems, which have low economic efficiency and complex development process. In addition, the current monitoring and communication methods of circuit breakers are relatively simple and cannot meet the requirements of efficient and accurate data transmission in various situations. For example, the electromagnetic type adopted by the circuit breaker control system proposed by Shanghai Jingsi Intelligent Technology Co., Ltd. (Circuit Breaker Control System: CN202111602797.9[P].2022-04-22) has insufficient sensitivity and insufficient stability using a single core. Summary of the invention

[0005] In order to overcome the above-mentioned problems of the prior art, the purpose of the present invention is to provide an intelligent circuit breaker control system and control method; by setting the control system of the circuit breaker, a core processor of a DSP chip and a FPGA chip dual-core is used to perform efficient signal processing and fault information analysis, thereby realizing intelligent control and intelligent protection of the circuit breaker; at the same time, a local human-computer interaction system is set up, and the circuit breaker information and fault status can be fed back in time, which has the characteristics of fast, real-time and remote knowledge of the working status of the circuit breaker, greatly reducing the problems of untimely understanding of circuit breaker faults caused by distance and other problems, and difficulty in collecting circuit breaker fault signals, thereby satisfying the intelligence and efficiency of the circuit breaker to the greatest extent.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A control system for an intelligent circuit breaker includes a core processor and a power module arranged in a circuit protected by the circuit breaker, the power module supplies power to the core processor, the core processor adopts a dual-core processor of a DSP chip and an FPGA chip, and is used to process collected signals and signals sent by a local human-computer interaction module to perform fault analysis; the signal input end of the core processor is connected to the signal output end of the sensor through an A / D converter, the core processor is also connected to a storage module, a clock module, a photoelectric isolation module and a local human-computer interaction module in a two-way signal manner, and the signal output end of the core processor is connected to the signal input end of an action mechanism.

[0008] The sensors include current, voltage sensors and displacement sensors. The current and voltage sensors are used to collect electrical signals from the protected circuits. The displacement sensor collects the displacement of the main contacts of the circuit breaker to obtain the opening and closing signals of the circuit breaker at that time. The A / D converter is used to convert the collected electrical signals into digital signals through filtering and amplification and transmit them to the core processor. The obtained circuit breaker opening and closing status signals are input into the core processor through the photoelectric isolation module to analyze and determine the type of circuit breaker fault.

[0009] The local human-computer interaction module includes an LCD and basic keys including a confirmation key, an exit key, a closing key, a disconnect key, a forward key, and a backward key, which realizes the transmission of local information to the core processor and transmits the output signal of the core processor to the LCD to display the real-time operating status information of the circuit breaker.

[0010] The core processor is connected to the communication module via the photoelectric isolation module to complete the real-time transmission of circuit breaker data information.

[0011] The communication module has two modes: wired communication and wireless communication. The wired communication includes RS485 serial communication, and the wireless communication includes Bluetooth communication and infrared communication. It is used to transmit the collected signals to the remote client software.

[0012] The frequency of the clock module is the standard frequency 32.768 kHz.

[0013] The action mechanism adopts an electronic release for disconnecting faults.

[0014] An intelligent circuit breaker control method determines whether a circuit breaker fails, performs protection actions after a failure, and updates an LCD interface in real time by calculating and analyzing periodic loop voltage and current. The specific steps are as follows:

[0015] Step 1: Initialize the parameters of the circuit protected by the circuit breaker;

[0016] Step 2: Set the timing of the clock module, sample the signal in the loop at regular time intervals, store the sampled data in the storage module, and after accumulating n, convert the collected electrical signals into digital signal values ​​of voltage and current through the A / D converter;

[0017] Step 3: The digital signal value converted in step 2 is transmitted to the fault judgment program in the core processor to judge whether the circuit breaker is faulty at this time; if there is a fault, proceed to the next step; if there is no fault, the data information at this time is refreshed in real time to the LCD interface display of the local human-computer interaction module;

[0018] Step 4: When the circuit breaker fails, the action mechanism will be activated according to the fault type, the LCD will give an alarm and the fault information will be refreshed to the LCD interface in real time;

[0019] Step 5: Set the interval time of the clock module in step 2 as a cycle, start the timer again, and return to step 2 for a cycle;

[0020] Step 6: Real-time transmission of data information of the circuit protected by the circuit breaker by the communication module:

[0021] When the circuit breaker is in normal working state, the current, voltage, power value of the load carried by the circuit breaker and the real-time working state of the circuit breaker at this time are transmitted to the remote client software at regular intervals;

[0022] When a circuit breaker is in a fault state, the fault type, fault current, fault voltage, fault time and fault action time information are immediately transmitted to the remote client software; the remote client software issues an instruction, and the circuit breaker receives the instruction to realize remote control of the circuit breaker to open and close.

[0023] The fault judgment procedure described in step 3 is as follows:

[0024] The calculation formula of circuit breaker fault action time t can be expressed as:

[0025]

[0026] In the formula, I r1 It refers to the current setting value of the circuit breaker overload long delay protection, i is the current value when the circuit breaker is overloaded, t L It is the time setting value of the circuit breaker overload long delay protection;

[0027] Voltage setting value calculation formula:

[0028]

[0029] Among them, V setting is the voltage setting value, V normal is the rated voltage value, ΔV is the allowable voltage fluctuation range;

[0030] When the circuit breaker voltage setting value exceeds 1.3 times the rated voltage, the circuit breaker overvoltage protection, the action time is 1-10s; when the circuit breaker voltage setting value is less than 0.7 times the rated voltage, the circuit breaker undervoltage protection, the action time is 1-30s; when the circuit breaker current setting value is 1-15 times the rated current, the short circuit starts instantaneous protection, the action time is less than 100ms; when the circuit breaker current setting value is 0.4-1 times the rated current, the short circuit starts overload long delay protection, the action time is 3-30s; when the circuit breaker current setting value is 0.4-10 times the rated current, the short circuit starts short circuit short delay protection, the action time is 0.1-0.4s.

[0031] The action time of the short-circuit short-delay protection in the fault judgment program is extremely short (0.1-0.4s). Based on this, a short-circuit instantaneous protection subroutine is set to improve the accuracy of the fault judgment program, as follows:

[0032] 1): Set the signal sampling interval in the circuit protected by the circuit breaker;

[0033] 2): Sampling is performed according to the set sampling interval, and the sampling value is compared with the current setting value. When the sampling value is greater than the current setting value twice in a row, the next step is performed; when the sampling value is not greater than the current setting value twice in a row, it is considered to be interference, not a fault, and the protection is not started;

[0034] 3): When it is judged as a fault, the electronic release trips to disconnect the fault circuit and start the fault warning.

[0035] Compared with the prior art, the main beneficial effects of the present invention are:

[0036] 1. The present invention is based on a dual-core core processor of DSP and FPGA, which has the advantages of powerful computing power, high stability, rapid response, and convenient interface integration. Compared with the common single-core processors on the market, the dual-core processor is used to process signals and analyze fault information, and can collect fault information, process fault information, and analyze fault types more efficiently and quickly, thereby improving the efficiency of the system to the greatest extent and greatly reducing the safety hazards caused by slow information processing.

[0037] 2. The wired communication method in the communication module of the present invention has the characteristics of strong anti-interference ability, high communication rate, and is suitable for reliable communication between various devices; the wireless communication method has the advantages of low power consumption, multi-function, and strong applicability; compared with the method of using only wireless communication or wired communication, the communication method combining wired communication and wireless communication is used for information transmission. The remote user-end system can monitor the working status of the circuit breaker in real time, enhance the reliability, timeliness, and diversity of information transmission, and adapt to various working scenarios of the circuit breaker.

[0038] 3. The present invention realizes the control of the opening and closing of the circuit breaker by setting a local human-computer interaction system and setting basic buttons. It has the characteristics of fast and timely feedback of circuit breaker information, fault status and other information to the local human-computer interaction LCD, real-time update of circuit breaker status and fault alarm, which is convenient for the staff to intuitively receive various information of the circuit breaker. At the same time, after a fault occurs, the previous fault information can be queried during the later maintenance and modification, which is convenient for users or after-sales operations to the greatest extent.

[0039] 4. The present invention uses a fault judgment program and simultaneously sets a short-circuit instantaneous protection subroutine to efficiently judge whether a fault exists, control the action mechanism to perform protection action, and refresh the LCD display in real time, thereby doubly ensuring the accuracy of fault judgment, avoiding interference and misjudgment to the greatest extent, and ensuring the normal operation of the circuit breaker.

[0040] In summary, the present invention realizes intelligent control and intelligent protection of the circuit breaker through the control system of the circuit breaker, adopts the setting of the fault judgment program and the short-circuit instantaneous protection subroutine, and has the characteristics of rapid, real-time and remote knowledge of the working status of the circuit breaker, which greatly reduces the problems of untimely understanding of circuit breaker faults caused by distance and other problems, and difficulty in collecting circuit breaker fault signals, and satisfies the intelligence and efficiency of the circuit breaker to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0042] Figure 2 The present invention is a flow chart of the method.

[0043] Figure 3This is a sub-flow chart of the short-circuit instantaneous protection of the present invention. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0045] refer to Figure 1 As shown, a control system of an intelligent circuit breaker includes a core processor and a power module arranged in a circuit protected by the circuit breaker, the power module supplies power to the core processor, the core processor adopts a dual-core processor of a DSP chip and an FPGA chip, and is used to process collected signals and signals sent by a local human-computer interaction module to perform fault analysis; the signal input end of the core processor is connected to the signal output end of the sensor through an A / D converter, the core processor is also connected to a storage module, a clock module, a photoelectric isolation module and a local human-computer interaction module in a two-way signal manner, and the signal output end of the core processor is connected to the signal input end of the action mechanism.

[0046] The sensors include current, voltage sensors and displacement sensors. The current and voltage sensors are used to collect electrical signals from the protected circuits. The displacement sensor collects the displacement of the main contacts of the circuit breaker to obtain the opening and closing signals of the circuit breaker at that time. The A / D converter is used to convert the collected electrical signals into digital signals through filtering and amplification and transmit them to the core processor. The obtained circuit breaker opening and closing status signals are input into the core processor through the photoelectric isolation module to analyze and determine the type of circuit breaker fault.

[0047] The local human-computer interaction module includes an LCD and basic keys including a confirmation key, an exit key, a closing key, a disconnect key, a forward key, and a backward key, which realizes the transmission of local information to the core processor and transmits the output signal of the core processor to the LCD to display the real-time operating status information of the circuit breaker.

[0048] The core processor is connected to the communication module via the photoelectric isolation module to complete the real-time transmission of circuit breaker data information.

[0049] The communication module has two modes: wired communication and wireless communication. Wired communication includes RS485 serial communication, and wireless communication includes Bluetooth communication and infrared communication. It is used to transmit the collected signals to the remote client software, which minimizes the interference of other signals on site and ensures timely and accurate signal transmission.

[0050] The storage module uses an SRAM memory with fast storage speed and low latency;

[0051] The action mechanism adopts an electronic release, which is used to disconnect the fault of the circuit protected by the circuit breaker.

[0052] The power supply module includes two types: an external power supply and an embedded battery, so that when the external power supply is cut off, the battery can continue to power the system to ensure normal operation of the system and data storage;

[0053] The frequency of the clock module is the standard frequency 32.768kHz, which ensures the accuracy of time.

[0054] An intelligent circuit breaker control method determines whether a circuit breaker fails, performs protection actions after a failure, and updates an LCD interface in real time by calculating and analyzing periodic loop voltage and current. The specific steps are as follows:

[0055] Step 1: Initialize the parameters of the circuit protected by the circuit breaker;

[0056] Step 2: Set the timing of the clock module, sample the signal in the loop every 0.5ms, store the sampled data in the storage module, and after accumulating 10 times, convert the collected electrical signal into digital signal values ​​of voltage and current through the A / D converter;

[0057] Step 3: The digital signal value converted in step 2 is transmitted to the fault judgment program in the core processor to judge whether the circuit breaker is faulty at this time; if there is a fault, proceed to the next step; if there is no fault, the data information at this time is refreshed in real time to the LCD interface display of the local human-computer interaction module;

[0058] Step 4: When the circuit breaker fails, the action mechanism will be activated according to the fault type, the LCD will give an alarm and the fault information will be refreshed to the LCD interface in real time;

[0059] Step 5: Set the clock module to have a cycle of 5 ms according to step 2, start the timer again, and return to step 2 to repeat.

[0060] Step 6: Real-time transmission of data information of the circuit protected by the circuit breaker by the communication module:

[0061] When the circuit breaker is in normal working state, the current, voltage, power value of the load carried by the circuit breaker and the real-time working state of the circuit breaker at this time are transmitted to the remote client software at regular intervals;

[0062] When a circuit breaker is in a fault state, the fault type, fault current, fault voltage, fault time and fault action time information are immediately transmitted to the remote client software; the remote client software issues an instruction, and the circuit breaker receives the instruction to realize remote control of the circuit breaker to open and close.

[0063] The fault judgment procedure described in step 3 is as follows:

[0064] The calculation formula of circuit breaker fault action time t can be expressed as:

[0065]

[0066] In the formula, I r1 It refers to the current setting value of the circuit breaker overload long delay protection, i is the current value when the circuit breaker is overloaded, t L It is the time setting value of the circuit breaker overload long delay protection;

[0067] Voltage setting value calculation formula:

[0068]

[0069] Among them, V setting is the voltage setting value, V normal is the rated voltage value, ΔV is the allowable voltage fluctuation range;

[0070] When the circuit breaker voltage setting value exceeds 1.3 times the rated voltage, the circuit breaker overvoltage protection, the action time is 1-10s; when the circuit breaker voltage setting value is less than 0.7 times the rated voltage, the circuit breaker undervoltage protection, the action time is 1-30s; when the circuit breaker current setting value is 1-15 times the rated current, the short circuit starts instantaneous protection, the action time is less than 100ms; when the circuit breaker current setting value is 0.4-1 times the rated current, the short circuit starts overload long delay protection, the action time is 3-30s; when the circuit breaker current setting value is 0.4-10 times the rated current, the short circuit starts short circuit short delay protection, the action time is 0.1-0.4s.

[0071] The action time of the short-circuit short-delay protection in the fault judgment program is extremely short (0.1-0.4s). Based on this, a short-circuit instantaneous protection subroutine is set to improve the accuracy of the fault judgment program, as follows:

[0072] 1): Set the signal sampling interval in the circuit protected by the circuit breaker to 0.5ms;

[0073] 2): Sample the signal in the circuit protected by the circuit breaker every 0.5ms, and compare the sampled value with the current setting value. When the sampled value is greater than the current setting value twice in a row, proceed to the next step; when the sampled value is not greater than the current setting value twice in a row, it is considered to be interference, not a fault, and the protection is not started;

[0074] 3): When it is judged as a fault, the electronic release trips to disconnect the fault circuit and start the fault warning.

[0075] The working principle of the present invention is as follows:

[0076] refer to Figures 1 to 3As shown, the current and voltage sensors are connected to the input end of the A / D converter to collect the current signal and voltage signal in the loop; the displacement sensor collects the displacement of the main contact of the circuit breaker to obtain the opening and closing signal of the circuit breaker at this time; the electrical signal is converted by the A / D converter, and the output end outputs the digital signal to the core processor; the detected circuit breaker opening and closing state signal is input to the core processor after the photoelectric isolation module to detect the circuit breaker fault; if the circuit breaker is judged to have a fault, the core processor outputs an action signal, the action mechanism is activated, and the circuit breaker disconnects the fault; and the circuit breaker fault type and data are refreshed to the local human-computer interaction LCD interface in real time and an alarm is issued, the remote client software can receive the circuit breaker related fault information in real time, and the circuit breaker fault type and data information can be saved to the SRAM memory; the local human-computer interaction can also issue instructions to the circuit breaker through basic key operations, and the remote client software can also issue remote instructions to the circuit breaker to realize the remote opening and closing of the circuit breaker. The above is only a basic description of the example of the present invention, and does not limit the scope of application of the present invention. Without departing from the scope of the present invention, some changes and substitutions can be made to the present invention.

Claims

1. A control system for an intelligent circuit breaker, comprising a core processor and a power module arranged in a circuit protected by the circuit breaker, wherein the power module supplies power to the core processor, and wherein: The core processor adopts a dual-core processor of a DSP chip and an FPGA chip, which is used to process the collected signals and the signals sent by the local human-computer interaction module to perform fault analysis; the signal input end of the core processor is connected to the signal output end of the sensor through an A / D converter, and the core processor is also connected to the storage module, the clock module, the photoelectric isolation module and the local human-computer interaction module in a two-way signal manner, and the signal output end of the core processor is connected to the signal input end of the action mechanism.

2. The control system of an intelligent circuit breaker according to claim 1, characterized in that: The sensors include current, voltage sensors and displacement sensors. The current and voltage sensors are used to collect electrical signals from the protected circuits. The displacement sensor collects the displacement of the main contacts of the circuit breaker to obtain the opening and closing signals of the circuit breaker at that time. The A / D converter is used to convert the collected electrical signals into digital signals through filtering and amplification and transmit them to the core processor. The obtained circuit breaker opening and closing status signals are input into the core processor through the photoelectric isolation module to analyze and determine the type of circuit breaker fault.

3. The control system of an intelligent circuit breaker according to claim 1, characterized in that: The local human-computer interaction module includes an LCD and basic keys including a confirmation key, an exit key, a closing key, a disconnect key, a forward key, and a backward key, which realizes the transmission of local information to the core processor and transmits the output signal of the core processor to the LCD to display the real-time operating status information of the circuit breaker.

4. The control system of an intelligent circuit breaker according to claim 1, characterized in that: The core processor is connected to the communication module via the photoelectric isolation module to complete the real-time transmission of circuit breaker data information.

5. The control system of an intelligent circuit breaker according to claim 4, characterized in that: The communication module has two modes: wired communication and wireless communication. The wired communication includes RS485 serial communication, and the wireless communication includes Bluetooth communication and infrared communication. It is used to transmit the collected signals to the remote client software.

6. The control system of an intelligent circuit breaker according to claim 1, characterized in that: The frequency of the clock module is the standard frequency 32.768 kHz.

7. The control system of an intelligent circuit breaker according to claim 1, characterized in that: The action mechanism adopts an electronic release, which is used to disconnect the fault of the circuit protected by the circuit breaker.

8. An intelligent circuit breaker control method, characterized in that: By calculating and analyzing the periodic loop voltage and current, it is possible to determine whether the circuit breaker has a fault, the protection action after the fault, and the real-time update of the LCD interface. The specific steps are as follows: Step 1: Initialize the parameters of the circuit protected by the circuit breaker; Step 2: Set the timing of the clock module, sample the signal in the loop at regular time intervals, store the sampled data in the storage module, and after accumulating n, convert the collected electrical signals into digital signal values ​​of voltage and current through the A / D converter; Step 3: The digital signal value converted in step 2 is transmitted to the fault judgment program in the core processor to judge whether the circuit breaker is faulty at this time; if there is a fault, proceed to the next step; If there is no fault, the data information at this time is refreshed in real time to the LCD interface display of the local human-computer interaction module; Step 4: When the circuit breaker fails, the action mechanism will be activated according to the fault type, the LCD will give an alarm and the fault information will be refreshed to the LCD interface in real time; Step 5: Set the interval time of the clock module as a cycle according to step 2, start the timer again, and return to step 2 for a cycle; Step 6: Real-time transmission of data information of the circuit protected by the circuit breaker by the communication module: When the circuit breaker is in normal working state, the current, voltage, power value of the load carried by the circuit breaker and the real-time working state of the circuit breaker at this time are transmitted to the remote client software at regular intervals; When a circuit breaker is in a fault state, the fault type, fault current, fault voltage, fault time and fault action time information are immediately transmitted to the remote client software; the remote client software issues an instruction, and the circuit breaker receives the instruction to realize remote control of the circuit breaker to open and close.

9. The intelligent circuit breaker control method according to claim 8, characterized in that: The fault judgment procedure described in step 3 is as follows: The calculation formula of circuit breaker fault action time t can be expressed as: In the formula, I r1 It refers to the current setting value of the circuit breaker overload long delay protection, i is the current value when the circuit breaker is overloaded, t L It is the time setting value of the circuit breaker overload long delay protection; Voltage setting value calculation formula: Among them, V setting is the voltage setting value, V normal is the rated voltage value, ΔV is the allowable voltage fluctuation range; When the circuit breaker voltage setting value exceeds 1.3 times the rated voltage, the circuit breaker overvoltage protection, the action time is 1-10s; when the circuit breaker voltage setting value is less than 0.7 times the rated voltage, the circuit breaker undervoltage protection, the action time is 1-30s; when the circuit breaker current setting value is 1-15 times the rated current, the short circuit starts instantaneous protection, the action time is less than 100ms; when the circuit breaker current setting value is 0.4-1 times the rated current, the short circuit starts overload long delay protection, the action time is 3-30s; when the circuit breaker current setting value is 0.4-10 times the rated current, the short circuit starts short circuit short delay protection, the action time is 0.1-0.4s.

10. The intelligent circuit breaker control method according to claim 9, characterized in that: The action time of the short-circuit short-delay protection in the fault judgment program is extremely short (0.1-0.4s). Based on this, a short-circuit instantaneous protection subroutine is set to improve the accuracy of the fault judgment program, as follows: 1): Set the signal sampling interval in the circuit protected by the circuit breaker; 2): Sampling is performed according to the set sampling interval, and the sampling value is compared with the current setting value. When the sampling value is greater than the current setting value twice in a row, the next step is performed; If the sampling value is not greater than the current setting value twice in a row, it is considered as interference, not a fault, and the protection will not be activated; 3): When it is judged as a fault, the electronic release trips to disconnect the fault circuit and start the fault warning.

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