A digital primary-secondary fusion switch and control method

Abstract

The application relates to the technical field of fusion switches, in particular to a digital primary and secondary fusion switch and a control method. The application provides a digital primary and secondary fusion switch which comprises a voltage sensor, a current sensor, an analog-to-digital converter, a first micro control module, an optoelectronic coupler, a second micro control module, a man-machine interactive interface, a signal isolator, a switching operator, a first power supply and a second power supply. Firstly, the voltage sensor, the current sensor and the analog-to-digital converter are used to collect the analog quantity of a line in a digital manner, then the first micro control module executes a protection control algorithm, and the optoelectronic coupler is used to interact data with the second micro control module, the second micro control module interacts with the man-machine interface and sends a switching control instruction, and the signal isolator realizes electrical isolation. In addition, the first power supply and the second power supply are used to independently supply power for the collection and protection control circuit and the man-machine interaction and control execution circuit, so that the real-time response capability and the overall power supply reliability are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fusion switches, and in particular to a digital primary and secondary fusion switch and a control method. BACKGROUND

[0002] With the continuous expansion of the power grid scale and the continuous growth of power load, the operation safety and power supply reliability of the power system have become increasingly important. The traditional power system protection equipment has problems such as response delay and protection blind area, and is difficult to meet the urgent needs of modern power grids for fast fault removal and accurate positioning.

[0003] In the prior art, the primary equipment and the secondary protection device are physically isolated, and need to exchange analog quantity information through a traditional hard-wired mode, which not only increases the wiring complexity, but also makes the information transmission link lengthy, and it is difficult to achieve fast protection response and has low reliability. The situation needs to be further improved. SUMMARY

[0004] In order to solve the problem of low reliability of the existing power system protection equipment, the present application provides a digital primary and secondary fusion switch and a control method, which adopts the following technical scheme:

[0005] In the first aspect, the present application provides a digital primary and secondary fusion switch, comprising a voltage sensor, a current sensor, an analog-to-digital converter, a first micro-control module, an optoelectronic coupler, a second micro-control module, a human-computer interaction interface, a signal isolator, a switching operator, a first power supply and a second power supply,

[0006] The voltage sensor is used to acquire a line voltage signal, and the current sensor is used to acquire a line current signal;

[0007] The analog-to-digital converter is electrically connected with the voltage sensor and the current sensor, and is used to convert the line voltage signal and the line current signal into a digital signal;

[0008] The first micro-control module is electrically connected with the analog-to-digital converter, and is used to execute a protection and control algorithm based on the digital signal;

[0009] The optoelectronic coupler is electrically connected with the first micro-control module, and is used to realize data interaction with the second micro-control module;

[0010] The second micro-control module is electrically connected with the human-computer interaction interface and the signal isolator;

[0011] The signal isolator is electrically connected with the switching operator, and is used to isolate a switching control signal;

[0012] The first power supply is used for powering the voltage sensor, the current sensor, the analog-digital converter and the first micro-control module;

[0013] The second power supply is used for powering the second micro-control module, the human-computer interaction interface, the signal isolator and the opening and closing operator.

[0014] By adopting the technical scheme, firstly, the voltage sensor, the current sensor and the analog-digital converter are used to collect the line analog quantity in a digital manner, and then the digital signal is transmitted to the first micro-control module to execute a protection control algorithm; the first micro-control module interacts data with the second micro-control module through the photoelectric coupler, the second micro-control module is responsible for interacting with the human-computer interface and issuing an opening and closing control instruction, and electrical isolation is realized through the signal isolator; in addition, the first power supply independently powers the acquisition and protection control circuit, and the second power supply independently powers the human-computer interaction and control execution circuit, thereby effectively improving the power supply reliability, the physically separated double micro-control unit architecture reduces the signal transmission pressure and improves the real-time response capability; the open human-computer interaction interface provides convenience for users to adjust parameters; and the independent dual power supply design improves the overall power supply reliability.

[0015] Optionally, the first power supply comprises a first group of secondary windings of a power taking transformer and a first alternating current-direct current conversion circuit; and the second power supply comprises a second group of secondary windings of the power taking transformer, a second alternating current-direct current conversion circuit, a storage battery and a direct current-direct current conversion circuit.

[0016] By adopting the technical scheme, the power supply circuit is physically separated, and a backup power supply is provided through the storage battery; the first power supply is composed of the first group of secondary windings of the power taking transformer and the first alternating current-direct current conversion circuit, and is used for powering the voltage sensor, the current sensor, the analog-digital converter and the first micro-control module; the second power supply is composed of the second group of secondary windings of the power taking transformer, the second alternating current-direct current conversion circuit, the storage battery and the direct current-direct current conversion circuit, and is used for powering the second micro-control module, the human-computer interface, the signal isolator and the opening and closing operator; once a power supply fails, the other power supply can take over the power supply, ensuring the continuous normal operation of the entire system, which is conducive to improving the continuity and reliability of the power distribution line fault detection and removal; at the same time, through the power supply separation design, the power supply interference between the two functional units is also avoided, and the electromagnetic compatibility is improved.

[0017] Optionally, the first micro-control module specifically comprises:

[0018] The parameter comparison unit is configured to compare the line voltage data and the line current data with preset protection parameters, and determine whether the line data is abnormal.

[0019] A fault type determination unit is used to determine the fault type according to a preset protection logic when it is determined that the line data is abnormal;

[0020] The instruction sending unit is used to send a fault removal instruction corresponding to the fault type to the second micro-control module according to the fault type, so that the second micro-control module cuts off the fault section through the opening and closing operator.

[0021] By adopting the above technical solution, the parameter comparison unit of the present application first compares the line voltage and current data with the preset protection parameters to determine whether the line status is abnormal; once an abnormality is found, the fault type determination unit will further determine the specific fault type according to the preset protection logic; finally, the instruction sending unit will send the corresponding fault removal instruction to the second micro-control module according to the determined fault type, and the second micro-control module will drive the opening and closing operator to cut off the fault section; through intelligent fault detection and analysis, the fault type can be accurately and efficiently determined, avoiding the possible mis-cutting or missed cutting based on fixed strategies; at the same time, the preset protection logic can be flexibly adjusted according to actual needs, so that the fault handling strategy can be adapted to the line operating conditions, greatly improving the accuracy and adaptability of protection control.

[0022] Optionally, the fusion switch further includes a temperature sensor, which is used to obtain ambient temperature data. The first microcontroller module further includes:

[0023] an operation quality evaluation unit, configured to evaluate a current operation quality level of the line based on the line voltage data, the line voltage data, and the ambient temperature data;

[0024] A control strategy query unit is used to query a preset control strategy library according to the operation quality level and obtain corresponding opening and closing control operation instructions;

[0025] The instruction issuing unit is used to send the opening and closing control operation instruction to the second micro-control module.

[0026] By adopting the above technical solution, the present application adds a temperature sensor to obtain ambient temperature data; the operation quality evaluation unit in the first micro-control module will comprehensively analyze the line voltage, current and ambient temperature data, and determine the current operation quality level of the line according to the preset evaluation rules; then, the control strategy query unit will query the corresponding opening and closing control operation instructions in the preset control strategy library according to the operation quality level; finally, the instruction issuing unit sends the control instruction to the second micro-control module for execution; it can timely and comprehensively evaluate multiple key factors affecting the operation of the line, and accurately judge the operation quality status of the line; at the same time, through the preset control strategy library, appropriate control measures can be independently selected to achieve prevention-oriented and refined management and control, and minimize the occurrence of serious faults under harsh working conditions.

[0027] Optionally, the parameter comparison unit specifically includes:

[0028] a data comparison subunit, configured to compare the line voltage data and the line current data with preset protection parameters respectively, to determine whether the line data is abnormal;

[0029] The abnormality detection subunit is used to accumulate the abnormality judgment results of the digital comparison subunit. When the abnormality count reaches the abnormality judgment number threshold, it confirms that the line data is abnormal and notifies the fault type determination unit to determine the fault type.

[0030] By adopting the above technical solution, since line data is often affected by factors such as transient interference and produces short-term anomalies, if each data anomaly is immediately judged as a fault and removal measures are taken, it may lead to frequent mis-cutting operations and affect the continuity of power supply; the present application adopts a cumulative judgment method in the parameter comparison unit, by setting a threshold for the number of abnormal judgments. Only when the cumulative number of data anomalies reaches the threshold, it is confirmed as a real fault and subsequent processing is initiated, thereby improving the accuracy and reliability of fault detection.

[0031] Optionally, the fault type determination unit specifically includes:

[0032] The environment status acquisition subunit is used to obtain the current system operating environment status information;

[0033] A preliminary fault type receiving subunit is used to receive preliminary fault type information obtained by the first abnormality detection transmitted by the parameter comparison unit;

[0034] a fault response strategy query subunit, configured to query a fault response strategy library based on the operating environment status information and the preliminary fault type information, determine a fault response level to be responded to, and execute a quick response subunit if the fault response level is a quick response level; and execute a regular response subunit if the fault response level is a regular response level;

[0035] a fast response subunit configured to send a fault removal instruction corresponding to the preliminary fault type information to the second micro-control module;

[0036] a regular response subunit configured to send a fault removal instruction corresponding to the final confirmed fault type to the second micro-control module according to the final confirmed fault type when the abnormality count reaches the abnormality judgment threshold.

[0037] According to the technical scheme, since the timeliness and reliability of fault response are different under different fault types and environmental states, the application queries a preset fault response strategy library according to the running environmental state and the preliminary fault type, determines whether to adopt a fast response or a regular response mode, and corresponds to different fault removal processes respectively; the environmental state acquisition subunit acquires the current system running environmental state information; the preliminary fault type receiving subunit receives the preliminary fault type information transmitted by the parameter comparison unit; the fault response strategy query subunit queries the corresponding fault response level in the fault response strategy library according to the environmental state and the preliminary fault type, if the fault response level is a fast response level, the fast response subunit directly sends a corresponding fault removal instruction to the second micro-control module, if the fault response level is a regular response level, the regular response subunit waits for the abnormality detection to reach the judgment threshold, and sends a removal instruction according to the final confirmed fault type; thus, for a key fault that seriously affects the system safety and endangers the system safety, the fast response can timely remove the fault, and the power supply continuity is ensured; for a general fault, the regular response can improve the accuracy and avoid misremoval.

[0038] In a second aspect, the application provides a digital primary-secondary fusion switch control method, applied in the first micro-control module, including the following steps:

[0039] acquiring line voltage data and line current data;

[0040] comparing the line voltage data and the line current data with preset protection parameters to determine whether the line data is abnormal;

[0041] determining a fault type according to a preset protection logic when it is determined that the line data is abnormal;

[0042] sending a fault removal instruction corresponding to the fault type to the second micro-control module according to the fault type, so that the second micro-control module cuts off the fault section through the opening and closing operator.

[0043] Optionally, the fusion switch further includes a temperature sensor, and the method further includes the following steps:

[0044] acquiring environmental temperature data;

[0045] evaluating a current operation quality level of the line based on the line voltage data, the line voltage data, and the ambient temperature data;

[0046] According to the operation quality level, query the preset control strategy library to obtain the corresponding opening and closing control operation instructions;

[0047] The opening and closing control operation instruction is sent to the second micro-control module.

[0048] Optionally, comparing the line voltage data and the line current data with preset protection parameters to determine whether the line data is abnormal specifically includes the following steps:

[0049] Comparing the line voltage data and the line current data with preset protection parameters respectively to determine whether the line data is abnormal;

[0050] Accumulate the abnormality judgment results. When the abnormality count reaches the abnormality judgment number threshold, the line data is confirmed to be abnormal.

[0051] Optionally, when it is determined that the line data is abnormal, determining the fault type according to a preset protection logic specifically includes the following steps:

[0052] Get the current system operating environment status information;

[0053] receiving preliminary fault type information obtained from the first abnormality detection;

[0054] According to the operating environment status information and the preliminary fault type information, query the fault response strategy library to determine the fault response level of the response;

[0055] If the fault response level is a fast response level, sending a fault removal instruction corresponding to the preliminary fault type information to the second microcontroller module;

[0056] If the fault response level is a normal response level, when the abnormality count reaches the abnormality judgment times threshold, a fault removal instruction corresponding to the finally confirmed fault type is sent to the second microcontroller module according to the finally confirmed fault type.

[0057] In summary, this application includes at least one of the following beneficial technical effects:

[0058] 1. This application first digitizes the analog value of the line through a voltage sensor, a current sensor, and an analog-to-digital converter, and then transmits the digital signal to the first microcontroller to execute the protection control algorithm. The first microcontroller exchanges data with the second microcontroller through an optocoupler. The second microcontroller is responsible for interacting with the human-machine interface and issuing opening and closing control instructions. Electrical isolation is achieved in the middle through a signal isolator. In addition, the first power supply independently supplies power to the acquisition and protection control circuits, and the second power supply independently supplies power to the human-machine interaction and control execution circuits, effectively improving power supply reliability. The physically separated dual microcontroller unit architecture reduces signal transmission pressure and improves real-time response capabilities. The open human-machine interaction interface provides convenience for users to adjust parameters. The independent dual power supply design improves overall power supply reliability.

[0059] 2. The parameter comparison unit of this application first compares the line voltage and current data with the preset protection parameters to determine whether the line status is abnormal. Once an abnormality is found, the fault type determination unit will further determine the specific fault type based on the preset protection logic. Finally, the instruction sending unit will send the corresponding fault removal instruction to the second micro-control module based on the determined fault type, and the second micro-control module will drive the opening and closing operators to cut off the fault section. Through intelligent fault detection and analysis, the fault type can be accurately and efficiently determined, avoiding the possibility of mis-cutting or missed cutting based on fixed strategies. At the same time, the preset protection logic can be flexibly adjusted according to actual needs, so that the fault handling strategy can be adapted to the line operating conditions, greatly improving the accuracy and adaptability of protection control.

[0060] 3. This application queries the preset fault response strategy library based on the operating environment status and the preliminary fault type, and determines whether to adopt a quick response or a conventional response method, which corresponds to different fault removal processes; the environmental status acquisition subunit will obtain the current system operating environment status information; the preliminary fault type receiving subunit receives the preliminary fault type information transmitted by the parameter comparison unit; the fault response strategy query subunit queries the corresponding fault response level in the fault response strategy library based on the environmental status and the preliminary fault type. If it is a quick response level, the quick response subunit directly sends the corresponding fault removal instruction to the second microcontroller module; if it is a conventional response level, the conventional response subunit waits for the abnormal detection to reach the judgment number threshold, and sends a removal instruction according to the final confirmed fault type; thereby, for critical faults that have a serious impact and endanger system safety, they can be removed in time through quick response to ensure power supply continuity; for general faults, conventional response is used to improve accuracy and avoid mis-cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 This is a connection diagram of a digital primary and secondary fusion switch according to an embodiment of the present application;

[0062] Figure 2 1 is a schematic diagram of a first microcontroller module according to an embodiment of the present application;

[0063] Figure 3 This is a flow chart of a digital primary-secondary fusion switch control method according to an embodiment of the present application;

[0064] Figure 4 This is another flow chart of a digital primary-secondary fusion switch control method according to an embodiment of the present application;

[0065] Figure 5 This is a flow chart of step S32 in a digital primary-secondary fusion switch control method according to an embodiment of the present application;

[0066] Figure 6 This is a flow chart of step S33 in a digital primary-secondary fusion switch control method according to an embodiment of the present application.

[0067] Explanation of the accompanying drawings: 1. Voltage sensor; 2. Current sensor; 3. Analog-to-digital converter; 4. First microcontroller module; 5. Optocoupler; 6. Second microcontroller module; 7. Human-machine interface; 8. Communication module; 9. Signal isolator; 10. Opening and closing operator; 11. First power supply; 12. Second power supply; 111. First set of secondary windings; 112. First AC-DC conversion circuit; 121. Second set of secondary windings; 122. Second AC-DC conversion circuit; 123. Battery; 124. DC-DC conversion circuit; 13. Temperature sensor. DETAILED DESCRIPTION

[0068] The terms used in the following examples of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and appended claims of this application, the singular expressions "a," "an," "said," "above," "the," and "this" are intended to include plural expressions as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used in this application refers to any or all possible combinations comprising one or more of the listed items.

[0069] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of this application, unless otherwise specified, "plurality" means two or more.

[0070] The embodiments of the present application are described in further detail below with reference to the accompanying drawings.

[0071] In the first aspect, the present application provides a digital primary and secondary fusion switch, referring to Figure 1 , a digital primary and secondary fusion switch, including a voltage sensor 1, a current sensor 2, an analog-to-digital converter 3, a first microcontroller module 4, a photoelectric coupler 5, a second microcontroller module 6, a human-machine interface 7, a communication module 8, a signal isolator 9, a switch-on and switch-off operator 10, a first power supply 11 and a second power supply 12, the voltage sensor 1 is used to obtain a line voltage signal, and the current sensor 2 is used to obtain a line current signal; the analog-to-digital converter 3 is electrically connected to the voltage sensor 1 and the current sensor 2, and is used to convert the line voltage signal and the line current signal into a digital signal; the first microcontroller module 4 is electrically connected to the analog-to-digital converter 3, and is used based on Digital signals execute protection and control algorithms; the optocoupler 5 is electrically connected to the first microcontroller module 4 for realizing data interaction with the second microcontroller module 6; the second microcontroller module 6 is electrically connected to the human-computer interaction interface 7, the communication module 8 and the signal isolator 9; the signal isolator 9 is electrically connected to the opening and closing operator 10 for isolating the opening and closing control signals; the first power supply 11 is used to power the voltage sensor 1, the current sensor 2, the analog-to-digital converter 3 and the first microcontroller module 4; the second power supply 12 is used to power the second microcontroller module 6, the human-computer interaction interface 7, the communication module 8, the signal isolator 9 and the opening and closing operator 10.

[0072] During the operation of the distribution network, the fusion switch first digitally collects the line analog quantity through the voltage sensor 1, the current sensor 2 and the analog-to-digital converter 3, and then transmits the digital signal to the first microcontroller module 4 to execute the protection control algorithm; the first microcontroller module 4 exchanges data with the second microcontroller module 6 through the optocoupler 5, and the second microcontroller module 6 is responsible for interacting with the human-machine interaction interface 7 and issuing opening and closing control instructions, and electrical isolation is achieved through the signal isolator 9 in the middle; in addition, the first power supply 11 independently supplies power to the acquisition and protection control circuits, and the second power supply 12 independently supplies power to the human-machine interaction and control execution circuits, which effectively improves the power supply reliability. The physically separated dual microcontroller unit architecture reduces the signal transmission pressure and improves the real-time response capability; the open human-machine interaction interface 7 provides convenience for users to adjust parameters; the independent dual power supply design improves the overall power supply reliability.

[0073] In some application environments where communication is not required, the second micro-control module 6, the human-computer interaction interface 7, the communication module 8 and the second power supply 12 can be removed, thereby reducing costs.

[0074] In one embodiment, the first power supply 11 includes a first set of secondary windings 111 of a power transformer and a first AC-DC converter circuit 112; the second power supply 12 includes a second set of secondary windings 121 of a power transformer, a second AC-DC converter circuit 122, a battery 123, and a DC-DC converter circuit 124. If one power supply fails, the other power supply can take over, ensuring continued normal operation of the entire system, which helps improve the continuity and reliability of distribution line fault detection and removal. Furthermore, the power separation design avoids power interference between the two functional units, improving electromagnetic compatibility.

[0075] In one embodiment, referring to Figure 2 , the first micro-control module 4 specifically includes:

[0076] The parameter comparison unit is used to compare the line voltage data and line current data with the preset protection parameters to determine whether the line data is abnormal.

[0077] The line voltage and current data refer to the analog line voltage and current signals collected from voltage sensor 1 and current sensor 2, respectively, and converted to digital values ​​by analog-to-digital converter 3. Protection parameters refer to a set of pre-set voltage and current thresholds used to determine whether a line is in a normal state. These can be single thresholds or multiple thresholds.

[0078] Specifically, by comparing the real-time digital values ​​of line voltage and current with protection parameters, if they exceed the set threshold range, it is determined that the line data is abnormal.

[0079] The fault type determination unit is used to determine the fault type according to the preset protection logic when it is determined that the line data is abnormal.

[0080] The preset protection logic refers to a series of rules and criteria developed based on line parameters and fault phenomena, used to determine fault types such as overcurrent, undervoltage, and single-phase grounding. By pre-setting a fault type criterion library, when the parameter comparison unit detects data anomalies, it obtains the relevant data, matches it with the fault type criterion library, and analyzes and determines the specific fault type.

[0081] The instruction sending unit is used to send a fault removal instruction corresponding to the fault type to the second micro-control module 6 according to the fault type, so that the second micro-control module 6 cuts off the fault section through the opening and closing operator 10.

[0082] Among them, the fault removal instruction refers to an operating instruction requiring the line switch to act, such as closing, opening, etc., which is used to remove the fault section. According to the fault type determined by the fault type determination unit, the instruction sending unit sends the corresponding fault removal instruction to the second micro-control module 6 to realize the removal of the fault section.

[0083] In an optional embodiment, the fusion switch further includes a temperature sensor 13, which is used to obtain ambient temperature data. The first micro-control module 4 further includes:

[0084] The operation quality evaluation unit is used to evaluate the current operation quality level of the line based on the line voltage data, line voltage data and ambient temperature data.

[0085] In this embodiment, a temperature sensor 13 is introduced to obtain ambient temperature data, and a fuzzy logic evaluation algorithm is used to input voltage, current and temperature data and output the corresponding operation quality level.

[0086] The control strategy query unit is used to query the preset control strategy library according to the operation quality level and obtain the corresponding opening and closing control operation instructions.

[0087] In this embodiment, a control strategy library is pre-set and stored in the memory of the first microcontroller 4. Based on the operational quality level output by the operational quality assessment unit, the pre-set control strategy library is queried to obtain the opening and closing operation instructions corresponding to that level. For example, if operational quality begins to decline, it may indicate an increasing potential risk of a fault. Therefore, preemptively executing the corresponding opening or current limiting operations based on different operational quality levels can serve as a preventive control measure, preventing the fault from further escalating and leading to more serious consequences.

[0088] The instruction issuing unit is used to send the opening and closing control operation instructions to the second micro-control module 6.

[0089] In one embodiment, the parameter comparison unit specifically includes:

[0090] The data comparison subunit is used to compare the line voltage data and line current data with the preset protection parameters to determine whether the line data is abnormal.

[0091] The anomaly detection subunit is used to accumulate the anomaly judgment results of the digital comparison subunit. When the anomaly count reaches the anomaly judgment number threshold, it confirms that the line data is abnormal and notifies the fault type determination unit to determine the fault type.

[0092] Among them, since line data is often affected by factors such as transient interference and produces short-term anomalies, if every data anomaly is immediately determined to be a fault and removal measures are taken, it may lead to frequent mis-cutting operations, affecting power supply continuity.

[0093] In this embodiment, a cumulative judgment method is adopted in the parameter comparison unit. By setting a threshold for the number of abnormal judgments, only when the cumulative number of data abnormalities reaches the threshold is it confirmed as a real fault and subsequent processing is started, thereby improving the accuracy and reliability of fault detection.

[0094] In one embodiment, the fault type determination unit specifically includes:

[0095] The environment status acquisition subunit is used to obtain the current system operating environment status information.

[0096] In this embodiment, the current system operating environment status information can be manually entered through the human-computer interaction interface 7. The current system operating environment status information refers to the importance of the power supply load in the scenario where the current fusion switch is applied. Through manual classification, different fault response strategies are indeed needed for different operating environment states. Some scenarios focus on ensuring a rapid response to emergencies, and some scenarios can extend the response for further observation.

[0097] The preliminary fault type receiving subunit is used to receive preliminary fault type information obtained from the first abnormality detection transmitted by the parameter comparison unit.

[0098] In this embodiment, the preliminary fault type information refers to the fault type preliminarily determined by the parameter comparison unit when the abnormality is detected for the first time, such as overcurrent, undervoltage, etc.

[0099] The fault response strategy query subunit is used to query the fault response strategy library based on the operating environment status information and preliminary fault type information, and determine the fault response level of the response. If the fault response level is the quick response level, the quick response subunit is executed; if the fault response level is the regular response level, the regular response subunit is executed.

[0100] Among them, the fault response strategy library stores a query table of fault response levels corresponding to different environmental states and preliminary fault types. Fault response levels include quick response and regular response, which are determined based on the operating environment state information and preliminary fault type information.

[0101] Specifically, for each operating environment state, several quantitative grading levels are manually set. Similarly, quantitative grading is also set for fault type information, such as 5 points for overcurrent, 3 points for undervoltage, and 7 points for short circuit. Higher scores indicate greater harm, and corresponding weights are assigned to the operating environment state and fault type. The quantitative score of the operating environment state is then multiplied by the corresponding weight, and the quantitative score of the preliminary fault type information is added by the corresponding weight to obtain a comprehensive score. A scoring threshold is set. If the threshold is exceeded, a rapid response is initiated; if it is not, a standard response is initiated.

[0102] The fast response subunit is configured to send a fault removal instruction corresponding to the preliminary fault type information to the second micro-control module 6 .

[0103] The conventional response subunit is configured to wait for the abnormality count to reach an abnormality judgment times threshold, and then send a fault removal instruction corresponding to the finally confirmed fault type to the second microcontroller 6 according to the finally confirmed fault type.

[0104] In the second aspect, the present application provides a digital primary-secondary fusion switch control method, which is applied to the above-mentioned digital primary-secondary fusion switch. The digital primary-secondary fusion switch control method of the present application is described below in combination with the above-mentioned digital primary-secondary fusion switch.

[0105] Reference Figure 3 A digital primary and secondary fusion switch control method comprises the following steps:

[0106] S31. Acquire line voltage data and line current data.

[0107] S32. Compare the line voltage data and the line current data with the preset protection parameters to determine whether the line data is abnormal.

[0108] S33. When it is determined that the line data is abnormal, the fault type is determined according to a preset protection logic.

[0109] S34. According to the fault type, a fault removal instruction corresponding to the fault type is sent to the second micro-control module, so that the second micro-control module cuts off the fault section through the opening and closing operator.

[0110] In one embodiment, referring to Figure 4 The fusion switch further includes a temperature sensor, and the method further includes the following steps:

[0111] S41. Acquire ambient temperature data.

[0112] S42. Evaluate the current operation quality level of the line based on the line voltage data, the line voltage data, and the ambient temperature data.

[0113] S43. According to the operation quality level, query the preset control strategy library to obtain the corresponding opening and closing control operation instructions.

[0114] S44: Send the opening and closing control operation instruction to the second micro-control module.

[0115] Optional, see Figure 5 In step S32, the line voltage data and the line current data are compared with the preset protection parameters to determine whether the line data is abnormal, which specifically includes the following steps:

[0116] S51 . Compare the line voltage data and the line current data with the preset protection parameters respectively to determine whether the line data is abnormal.

[0117] S52: Accumulate abnormality judgment results. When the abnormality count reaches the abnormality judgment times threshold, confirm that the line data is abnormal.

[0118] In one embodiment, referring to Figure 6 In step S33, when it is determined that the line data is abnormal, the fault type is determined according to the preset protection logic, which specifically includes the following steps:

[0119] S61. Obtain current system operating environment status information.

[0120] S62: Receive preliminary fault type information obtained from the first abnormality detection.

[0121] S63. According to the operating environment status information and the preliminary fault type information, query the fault response strategy library to determine the fault response level of the response.

[0122] S64: If the fault response level is the fast response level, a fault removal instruction corresponding to the preliminary fault type information is sent to the second micro-control module.

[0123] S65: If the fault response level is the normal response level, wait until the abnormality count reaches the abnormality judgment times threshold, and then send a fault removal instruction corresponding to the finally confirmed fault type to the second microcontroller module according to the finally confirmed fault type.

[0124] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A digital primary-secondary fusion switch, comprising a voltage sensor (1), a current sensor (2), an analog-to-digital converter (3), a first microcontroller module (4), a photoelectric coupler (5), a second microcontroller module (6), a human-machine interface (7), a communication module (8), a signal isolator (9), a switch opening and closing operator (10), a first power supply (11) and a second power supply (12), characterized in that: The voltage sensor (1) is used to obtain a line voltage signal, and the current sensor (2) is used to obtain a line current signal; The analog-to-digital converter (3) is electrically connected to the voltage sensor (1) and the current sensor (2), and is used to convert the line voltage signal and the line current signal into digital signals; The first microcontroller module (4) is electrically connected to the analog-to-digital converter (3) and is used to execute protection and control algorithms based on the digital signal; The photoelectric coupler (5) is electrically connected to the first micro-control module (4) and is used to implement data interaction with the second micro-control module (6); The second microcontroller module (6) is electrically connected to the human-machine interaction interface (7), the communication module (8) and the signal isolator (9); The signal isolator (9) is electrically connected to the opening and closing operator (10) and is used to isolate the opening and closing control signals; The first power supply (11) is used to supply power to the voltage sensor (1), the current sensor (2), the analog-to-digital converter (3) and the first microcontroller module (4); The second power supply (12) is used to supply power to the second microcontroller module (6), the human-machine interaction interface (7), the communication module (8), the signal isolator (9) and the opening and closing operator (10).

2. The digital primary and secondary fusion switch according to claim 1, characterized in that: The first power supply (11) comprises a first set of secondary windings (111) of a power transformer and a first AC-DC conversion circuit (112); the second power supply (12) comprises a second set of secondary windings (121) of a power transformer, a second AC-DC conversion circuit (122), a battery (123) and a DC-DC conversion circuit (124).

3. The digital primary and secondary fusion switch according to claim 1, characterized in that: The first micro-control module (4) specifically includes: The parameter comparison unit is used to compare the line voltage data and line current data with the preset protection parameters to determine whether the line data is abnormal; A fault type determination unit is used to determine the fault type according to a preset protection logic when it is determined that the line data is abnormal; An instruction sending unit is used to send a fault removal instruction corresponding to the fault type to the second microcontrol module (6) according to the fault type, so that the second microcontrol module (6) cuts off the fault section through the opening and closing operator (10).

4. The digital primary and secondary fusion switch according to claim 3, characterized in that: The fusion switch further includes a temperature sensor (13), wherein the temperature sensor (13) is used to obtain ambient temperature data. The first microcontroller module (4) further includes: an operation quality evaluation unit, configured to evaluate a current operation quality level of the line based on the line voltage data, the line voltage data, and the ambient temperature data; A control strategy query unit is used to query a preset control strategy library according to the operation quality level and obtain corresponding opening and closing control operation instructions; An instruction sending unit is used to send the opening and closing control operation instruction to the second micro-control module (6).

5. The digital primary and secondary fusion switch according to claim 3, characterized in that: The parameter comparison unit specifically includes: a data comparison subunit, configured to compare the line voltage data and the line current data with preset protection parameters respectively, to determine whether the line data is abnormal; The abnormality detection subunit is used to accumulate the abnormality judgment results of the digital comparison subunit. When the abnormality count reaches the abnormality judgment number threshold, it confirms that the line data is abnormal and notifies the fault type determination unit to determine the fault type.

6. The digital primary and secondary fusion switch according to claim 5, characterized in that: The fault type determination unit specifically includes: The environment status acquisition subunit is used to obtain the current system operating environment status information; A preliminary fault type receiving subunit is used to receive preliminary fault type information obtained by the first abnormality detection transmitted by the parameter comparison unit; a fault response strategy query subunit, configured to query a fault response strategy library based on the operating environment status information and the preliminary fault type information, determine a fault response level to be responded to, and execute a quick response subunit if the fault response level is a quick response level; and execute a regular response subunit if the fault response level is a regular response level; A fast response subunit, configured to send a fault removal instruction corresponding to the preliminary fault type information to the second microcontroller module (6); The conventional response subunit is used for waiting for the abnormality count to reach the abnormality judgment number threshold, and then sending a fault removal instruction corresponding to the finally confirmed fault type to the second microcontroller module (6) according to the finally confirmed fault type.

7. A digital primary-secondary fusion switch control method, applied in the first microcontroller module (4) as claimed in claim 1, characterized in that: The steps include: Acquire line voltage data and line current data; Comparing the line voltage data and the line current data with preset protection parameters to determine whether the line data is abnormal; If the line data is found to be abnormal, the fault type is determined according to the preset protection logic; According to the fault type, a fault removal instruction corresponding to the fault type is sent to the second micro-control module (6), so that the second micro-control module (6) cuts off the fault section through the opening and closing operator (10).

8. The digital primary and secondary fusion switch control method according to claim 7, characterized in that: The fusion switch further comprises a temperature sensor (13), and the method further comprises the following steps: Get ambient temperature data; evaluating a current operation quality level of the line based on the line voltage data, the line voltage data, and the ambient temperature data; According to the operation quality level, query the preset control strategy library to obtain the corresponding opening and closing control operation instructions; The opening and closing control operation instruction is sent to the second micro-control module (6).

9. The digital primary and secondary fusion switch control method according to claim 7, characterized in that: Comparing the line voltage data and the line current data with preset protection parameters to determine whether the line data is abnormal specifically includes the following steps: Comparing the line voltage data and the line current data with preset protection parameters respectively to determine whether the line data is abnormal; Accumulate the abnormality judgment results. When the abnormality count reaches the abnormality judgment number threshold, the line data is confirmed to be abnormal.

10. The digital primary and secondary fusion switch control method according to claim 9, characterized in that: When it is determined that the line data is abnormal, determining the fault type according to the preset protection logic specifically includes the following steps: Get the current system operating environment status information; receiving preliminary fault type information obtained from the first abnormality detection; According to the operating environment status information and the preliminary fault type information, query the fault response strategy library to determine the fault response level of the response; If the fault response level is a fast response level, a fault removal instruction corresponding to the preliminary fault type information is sent to the second micro-control module (6); If the fault response level is a normal response level, when the abnormality count reaches the abnormality judgment times threshold, a fault removal instruction corresponding to the finally confirmed fault type is sent to the second microcontroller module (6) according to the finally confirmed fault type.

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