A control method and system for line protection device

Abstract

The present invention discloses a control method and system for a line protection device. When a human-computer interaction module receives a line protection request, it extracts basic data corresponding to the line protection request, obtains measurement data of the line where the damaged air switch is located, selects the current value in the measurement data, and calculates the cluster center index value of the current value. If the cluster center index value is greater than or equal to a preset cluster center index threshold, the basic data and the measurement data are compared to determine whether the measurement data is abnormal. If the measurement data is determined to be abnormal, the circuit breaker is disconnected, so that the line can be disconnected in time when a short circuit, overload or leakage occurs in the line, thereby improving the safety of the low-voltage line.

Description

Technical Field

[0001] The present invention relates to the field of electrical safety technology, and in particular to a control method and system applied to a line protection device. Background Art

[0002] With the continuous improvement of people's living standards, the importance of residential electricity is self-evident. Household electricity lines are complex and crisscross, and the amount of electricity consumed is huge, making short circuits and overloads prone to occur, which can lead to accidents such as fires and electric shocks. For this reason, air switches, also known as air circuit breakers, are very important electrical appliances in low-voltage distribution networks and electric traction systems. They integrate control and multiple protection functions. When an overvoltage or undervoltage condition occurs in the circuit, it automatically starts to cut off the power. In addition to completing the circuit disconnection, it can also protect the circuit or electrical equipment from short circuits, overloads, and leakage. If the faulty electrical equipment is an air circuit breaker and there is no spare air switch or suitable air switch to replace it, it will have a huge impact on the electricity user.

[0003] To this end, currently available technologies mainly provide temporary power supply to users by directly tripping air circuit breakers.

[0004] However, in the above-mentioned prior art, by directly tripping the air circuit breaker, the low-voltage line loses relay protection, and the line cannot be disconnected in time when a short circuit, overload or leakage occurs in the low-voltage line, which reduces the safety of the low-voltage line. Summary of the Invention

[0005] The present invention provides a control method and system for a line protection device, which solves the technical problem in the prior art that directly tripping an air circuit breaker will cause the low-voltage line to lose relay protection, and the line cannot be disconnected in time when a short circuit, overload or leakage occurs in the low-voltage line, thereby reducing the safety of the low-voltage line.

[0006] The present invention provides a control method for a line protection device, characterized in that the line protection device includes a human-computer interaction module and a circuit breaker, and the method includes:

[0007] When the human-computer interaction module receives a line protection request, it extracts basic data corresponding to the line protection request and obtains measurement data of the line where the damaged air switch is located;

[0008] Selecting current values ​​from the measurement data and calculating cluster center index values ​​of the current values;

[0009] If the cluster center index value is greater than or equal to a preset cluster center index threshold, comparing the basic data with the measurement data to determine whether the measurement data is abnormal;

[0010] If the measurement data is determined to be abnormal, the circuit breaker is opened.

[0011] Optionally, when the human-computer interaction module receives a line protection request, the step of extracting basic data corresponding to the line protection request and obtaining measurement data of the line where the damaged air switch is located includes:

[0012] When the human-computer interaction module receives a line protection request, it extracts the model parameters and line location parameters of the damaged air switch in the line protection request;

[0013] Input the model parameter into a preset data list, and match the target cell in the preset data list that corresponds to the model parameter;

[0014] Obtaining basic data in the target cell;

[0015] A sensor corresponding to the location parameter is determined, and measurement data on the line is acquired through the sensor.

[0016] Optionally, the step of selecting the current value in the measurement data and calculating the cluster center index value of the current value includes:

[0017] Selecting a current value from the measurement data, and extracting a harmonic characteristic quantity of the current value by a four-layer wavelet transform method;

[0018] Substituting the harmonic characteristic quantity into a preset local density calculation formula and a preset distance deviation formula to calculate the local density value and the distance deviation value of the harmonic characteristic quantity;

[0019] A first product of the distance deviation value and the local density value is calculated, and the first product is determined as a cluster center index value.

[0020] Optionally, the basic data includes a rated current value, a rated voltage value, and a rated temperature and humidity value; the measurement data includes a current value, a voltage value, and a temperature and humidity value; and if the cluster center index value is greater than or equal to a preset cluster center index threshold, the step of comparing the basic data with the measurement data to determine whether the measurement data is abnormal includes:

[0021] If the cluster center index value is greater than or equal to a preset cluster center index threshold, determining whether the current value is less than the rated current value;

[0022] If the current value is greater than or equal to the rated current value, determining that the measurement data is abnormal;

[0023] If the current value is less than the rated current value, determining whether the voltage value is less than the rated voltage value;

[0024] If the voltage value is greater than or equal to the rated voltage value, determining that the measurement data is abnormal;

[0025] If the voltage value is less than the rated voltage value, determining whether the temperature and humidity values ​​are less than the rated temperature and humidity values;

[0026] If the temperature and humidity value is greater than or equal to the rated temperature and humidity value, the measurement data is determined to be abnormal.

[0027] Optionally, it also includes:

[0028] If the cluster center index value is less than the preset cluster center index threshold, the process jumps to execute the step of extracting the basic data corresponding to the line protection request when the human-computer interaction module receives the line protection request, and obtaining the measurement data of the line where the damaged air switch is located.

[0029] A second aspect of the present invention provides a control system for a line protection device, wherein the line protection device includes a human-computer interaction module and a circuit breaker, and the system includes:

[0030] a data acquisition module, configured to extract basic data corresponding to a line protection request when the human-computer interaction module receives the line protection request, and obtain measurement data of the line where the damaged air switch is located;

[0031] An index value calculation module, configured to select a current value from the measurement data and calculate a cluster center index value of the current value;

[0032] a judgment and analysis module, configured to compare the basic data with the measurement data to determine whether the measurement data is abnormal if the cluster center index value is greater than or equal to a preset cluster center index threshold;

[0033] An execution module is configured to disconnect the circuit breaker if it is determined that the measurement data is abnormal.

[0034] Optionally, the data acquisition module includes:

[0035] A parameter extraction submodule, configured to extract the model parameters and line location parameters of the damaged air switch in the line protection request when the human-computer interaction module receives the line protection request;

[0036] A matching submodule, configured to input the model parameters into a preset data list and match target cells in the preset data list that correspond to the model parameters;

[0037] A basic data acquisition module, used to obtain basic data in the target cell;

[0038] The measurement data acquisition module is used to determine the sensor corresponding to the position parameter and obtain the measurement data on the line through the sensor.

[0039] Optionally, the indicator value calculation module includes:

[0040] A harmonic feature extraction submodule is used to select a current value in the measurement data and extract a harmonic feature of the current value by a four-layer wavelet transform method;

[0041] A harmonic feature calculation submodule, configured to substitute the harmonic feature quantity into a preset local density calculation formula and a preset distance deviation formula to calculate a local density value and a distance deviation value of the harmonic feature quantity;

[0042] The first multiplication value calculation submodule is used to calculate a first multiplication value of the distance deviation value and the local density value, and determine the first multiplication value as a cluster center index value.

[0043] Optionally, the basic data includes a rated current value, a rated voltage value, and a rated temperature and humidity value; the measurement data includes a current value, a voltage value, and a temperature and humidity value; and the judgment and analysis module includes:

[0044] a first judgment submodule, configured to judge whether the current value is less than the rated current value if the cluster center index value is greater than or equal to a preset cluster center index threshold;

[0045] a second judgment submodule, configured to determine that the measurement data is abnormal if the current value is greater than or equal to the rated current value;

[0046] a third judgment submodule, configured to judge whether the voltage value is less than the rated voltage value if the current value is less than the rated current value;

[0047] a fourth judgment submodule, configured to determine that the measurement data is abnormal if the voltage value is greater than or equal to the rated voltage value;

[0048] a fifth judgment submodule, configured to judge whether the temperature and humidity values ​​are less than the rated temperature and humidity values ​​if the voltage value is less than the rated voltage value;

[0049] The sixth judgment submodule is configured to determine that the measurement data is abnormal if the temperature and humidity values ​​are greater than or equal to the rated temperature and humidity values.

[0050] Optionally, it also includes:

[0051] A jump module is used to jump to execute the steps of extracting the basic data corresponding to the line protection request and obtaining the measurement data of the line where the damaged air switch is located when the human-computer interaction module receives the line protection request if the cluster center index value is less than the preset cluster center index threshold.

[0052] It can be seen from the above technical solutions that the present invention has the following advantages:

[0053] When the human-computer interaction module of the present invention receives a line protection request, it extracts the basic data corresponding to the line protection request and obtains the measurement data of the line where the damaged air switch is located. By selecting the current value in the measurement data, the current value is substituted into the preset cluster center index value formula to calculate the cluster center index value, and it is judged whether the obtained current value is consistent with the true current value. When the cluster center index value is greater than or equal to the preset cluster center index threshold, it means that the obtained current value is consistent with the true current value. Then, by comparing the basic data and the measurement data, it is judged whether the measurement data is abnormal. If the measurement data is determined to be abnormal, the circuit breaker on the line is disconnected, so that when a short circuit, overload or leakage occurs in the low-voltage line, the fault line can be disconnected in time, thereby improving the safety of the low-voltage line. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0055] Figure 1 A flowchart of a control method for a line protection device provided in accordance with the first embodiment of the present invention;

[0056] Figure 2 A flowchart of a control method for a line protection device provided in a second embodiment of the present invention;

[0057] Figure 3 A structural block diagram of a line protection device provided in the second embodiment of the present invention;

[0058] Figure 4 This is a structural block diagram of a control system applied to a line protection device provided in the third embodiment of the present invention. DETAILED DESCRIPTION

[0059] An embodiment of the present invention provides a control method and system for a line protection device, which is used to solve the technical problem that in the prior art, when the air switch is damaged, the air circuit breaker is directly tripped, causing the low-voltage line to lose relay protection. When a short circuit, overload or leakage occurs in the low-voltage line, the line cannot be disconnected in time, which reduces the safety of the low-voltage line.

[0060] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0061] See also Figure 1 , Figure 1 This is a flowchart of a control method applied to a line protection device provided in the first embodiment of the present invention.

[0062] The present invention provides a control method for a line protection device, comprising:

[0063] Step 101: When the human-computer interaction module receives a line protection request, it extracts basic data corresponding to the line protection request and obtains measurement data of the line where the damaged air switch is located.

[0064] The human-computer interaction module refers to the functional module of the line protection device used to receive line protection requests issued by staff.

[0065] A line protection request refers to a protection action request sent by a staff to the human-computer interaction module when a line air switch fails and there is no spare or suitable air switch to directly connect the line. The action request includes the model parameters of the damaged air switch and the location parameters of the line where the damaged air switch is located.

[0066] The basic data refers to the rated current, rated voltage, and rated temperature and humidity values ​​of the damaged air switch.

[0067] The measurement data refers to the current value, voltage value, temperature and humidity value of the circuit breaker where the fault occurs.

[0068] In an embodiment of the present application, when the human-computer interaction module of the line protection device receives a protection action request issued by a staff member, it extracts the model parameters of the damaged air switch and the location parameters of the line where it is located in the action protection request, and obtains the rated current value, rated voltage value and rated temperature and humidity values ​​of the damaged air switch based on the model parameters of the damaged air switch. Then, based on the location parameters of the line where the damaged air switch is located, it obtains the current value, voltage value and temperature and humidity values ​​of the line where it is located.

[0069] Step 102: Select the current value in the measurement data and calculate the cluster center index value of the current value;

[0070] The current value in the measurement data refers to the line current analog signal collected by the current sensor.

[0071] The cluster center index value refers to a reference index used to determine whether the acquired current value is consistent with the true value.

[0072] In an embodiment of the present application, after obtaining the current value, voltage value, and temperature and humidity values ​​in the circuit, the cluster center index value of the current value is calculated by substituting the current value into a preset cluster center index expression.

[0073] Step 103: If the cluster center index value is greater than or equal to the preset cluster center index threshold, the basic data and the measurement data are compared to determine whether the measurement data is abnormal.

[0074] The cluster center index threshold refers to a cluster center index value calculated when the measured current value matches the actual current value, and is used to determine whether the acquired current value matches the actual current value.

[0075] In an embodiment of the present application, when the calculated cluster center index value is greater than or equal to the preset cluster center index threshold, it means that the obtained current value is consistent with the actual current value, and then it is judged whether the current value is greater than or equal to the rated current value, and then it is judged whether the voltage value is greater than or equal to the rated voltage value, and whether the temperature and humidity values ​​are greater than or equal to the rated temperature and humidity values. If the current value is greater than or equal to the rated current value, it means that the current value is abnormal. If the voltage value is greater than or equal to the rated voltage value, it means that the voltage value is abnormal. If the temperature and humidity values ​​are greater than or equal to the rated temperature and humidity values, it means that the temperature and humidity values ​​are abnormal.

[0076] Step 104: If the measurement data is determined to be abnormal, the circuit breaker is disconnected.

[0077] A circuit breaker is a switching device that can close, carry and interrupt current under normal circuit conditions and can close, carry and interrupt current under abnormal circuit conditions within a specified time.

[0078] In an embodiment of the present application, when any one of the current value, voltage value, and temperature and humidity value is determined to be abnormal, it indicates that overload, short circuit or leakage may have occurred in the circuit and the circuit breaker where the damaged air switch circuit is located needs to be disconnected.

[0079] In an embodiment of the present application, when the human-computer interaction module of the line protection device receives a protection action request from a staff member, it extracts the model parameters of the damaged air switch and the location parameters of the line where it is located in the action protection request, obtains the rated current value, rated voltage value, and rated temperature and humidity value of the damaged air switch based on the model parameters of the damaged air switch, and then obtains the current value, voltage value, and temperature and humidity value of the line where the damaged air switch is located based on the location parameters of the line where the damaged air switch is located, and then substitutes the obtained current value into a preset cluster center index expression to calculate the cluster center index value of the current value, and judges whether the cluster center index value is greater than or equal to the preset cluster center index threshold value. If the cluster center index value is greater than or equal to the preset cluster center index threshold value, it judges whether the measurement data is abnormal by comparing the measurement data with the basic data. If it is determined that the measurement data is abnormal, the circuit breaker of the line where the damaged air switch is located is disconnected. This allows the busbar or low-voltage line to be directly tripped when there is no air switch to replace, and can also disconnect the line in time when a short circuit, overload, or leakage occurs in the low-voltage line or busbar, thereby improving the safety of the low-voltage line.

[0080] See also Figure 2 , Figure 2 This is a flowchart of a control method applied to a line protection device provided in the second embodiment of the present invention.

[0081] The present invention provides a control method for a line protection device, wherein the line protection device includes a human-computer interaction module and a circuit breaker, including:

[0082] Step 201: When the human-computer interaction module receives a line protection request, it extracts basic data corresponding to the line protection request and obtains measurement data of the line where the damaged air switch is located.

[0083] Furthermore, step 201 includes the following sub-steps:

[0084] When the human-computer interaction module receives a line protection request, it extracts the model parameters and line location parameters of the damaged air switch in the line protection request;

[0085] Input the model parameters into the preset data list, and match the target cells in the preset data list that correspond to the model parameters;

[0086] Get the basic data in the target cell;

[0087] Determine the sensor corresponding to the location parameter and obtain measurement data on the line through the sensor.

[0088] The location parameter refers to the electrical circuit where the damaged air switch is located.

[0089] Model parameters refer to the product model of the air switch, including the design serial number, breaking capacity, tripping level and number of levels of the manufacturer.

[0090] The preset data list refers to an Excel table containing the rated current values, rated voltage values, and rated temperature and humidity values ​​corresponding to all types of air switch models.

[0091] Sensors refer to current sensors, voltage sensors and temperature and humidity sensors used to collect current values, voltage values ​​or temperature and humidity values ​​in the circuit.

[0092] like Figure 3 As shown, the line protection device includes a device power supply, a temperature and humidity detection module, a data storage module, a communication module, a main control module, a voltage monitoring module, a current monitoring module, a human-computer interaction module and a circuit breaker. The current monitoring module is a 1000:1 current sensor, which is used to perform AD sampling on the line and transmit the sampled current data to the main control module. The voltage monitoring module is a voltage sensor, which is used to perform AD sampling on the line and convert the collected voltage into current and transmit it to the main control module. The device power supply is used to provide power for the temperature and humidity detection module, the data storage module, the communication module, the main control module, the voltage monitoring module, the current monitoring module, the human-computer interaction module and the circuit breaker. The human-computer interaction module uses buttons and OLED for users to set the rated current of the device and input the model and position parameters of the air switch, and display The operating status of the device, the data storage module is used to record the various operating parameters of the device in real time, as well as the setting parameters of the storage device. The temperature and humidity acquisition module is used to collect temperature and humidity data, and when the temperature is low, the humidity is appropriately increased, and when the temperature is high, the humidity is appropriately reduced. When the line protection device starts working, the main control module starts running. The user presses the button to set the target rated current and the damaged air switch model in the human-computer interaction module. The main control module collects the current, voltage and temperature and humidity data of the circuit through the current monitoring module, voltage monitoring module and temperature and humidity monitoring module. When the circuit working current reaches the rated current or the working voltage reaches the rated voltage or the working temperature and humidity reach the rated temperature and humidity, the main control output controls the circuit breaker, disconnects the switch, and stores the current, voltage and temperature and humidity in the data storage module.

[0093] In an embodiment of the present application, when the human-computer interaction module receives a line protection request, it extracts the model parameters of the damaged air switch and the electrical circuit location of the damaged air switch in the line protection request, inputs the air switch model parameters into a preset Excel data table, matches the target cells corresponding to the model parameters, obtains the rated current value, rated voltage value, and rated temperature and humidity values ​​in the target cells, and then determines the corresponding current sensor, voltage sensor, and temperature and humidity sensor on the electrical circuit based on the electrical circuit where the damaged air switch is located, and collects the current value, voltage value, and temperature and humidity values ​​of the circuit through the current sensor, voltage sensor, and temperature and humidity sensor.

[0094] It should be noted that before collecting the current value of the line where the damaged air switch is located, a current test is required to test whether the linearity of the current sensor is good. The first step is to use a current clamp meter and a line protection device to clamp 5 groups of different inductive loads respectively, and record the current test as the first group of test current, the second group of test current, the third group of test current, the fourth group of test current, and the fifth group of test current as shown in Table 1. The second step is to adjust the adjustable resistor on the basis of step 1 to change the resistance, and record the values ​​of the resistance change from the 1st to the 7th time. The third step is to adjust the resistance and load current values ​​through the operations of steps 1 and 2 to generate multiple groups of different current data. The fourth step is to analyze the data of the same group of this device and the clamp meter. From the data, we can see that as the detected current value increases, the accuracy becomes higher and higher. For example, in the third time of the second group, the current of this device is 75.2A, and the clamp meter is 76.5A, with a ratio of 98.3%; in the second time of the fourth group, the current of this device is 304.6A, and the clamp meter is 305.7A, with a ratio of 99.64%; analyzing multiple groups of the same time, the data of this device is equivalent to an unchanged resistance load, for example, the first current of the second group is 126.3A, the first current of the third group is 253.6A, and the first current of the fourth group is 384.6A, the third group / second group = 2.01, the fourth group / second group = 3.05, which is consistent with the corresponding inductor turns ratio, indicating that the current sensor of this device has good linearity and the step of taking the current value can be performed.

[0095] Table 1 Current test records

[0096]

[0097]

[0098] Step 202: Select the current value in the measurement data and extract the harmonic characteristic of the current value by using a four-layer wavelet transform method.

[0099] The four-layer wavelet transform method refers to reconstructing the current value through a discretized wavelet transform formula.

[0100] The discretized wavelet transform formula is:

[0101]

[0102] Among them, C j is the discrete wavelet transform of f(t), Ψ j,k (t) is a discrete wavelet function, m is an independent constant, and j and k are integers.

[0103] The expression of dyadic wavelet as mother wavelet is:

[0104] Ψ j,k (t) = 2 -j / 2 Ψ(2 -j tk);

[0105] Where t is a function of time.

[0106] The expression of harmonic disturbance signal is:

[0107]

[0108] where a j (k) is the scale factor.

[0109] In the embodiment of the present application, after the current value of the line is obtained by the current sensor, the current value is input into a discretized wavelet transform formula for feature extraction to obtain the harmonic feature value of the current value.

[0110] It should be noted that the line current value obtained by the current sensor is an analog current signal, which can be substituted into the discretized wavelet transform formula for feature extraction.

[0111] Step 203: Substitute the harmonic feature quantity into a preset local density calculation formula and a preset distance deviation formula to calculate a local density value and a distance deviation value of the harmonic feature quantity.

[0112] Harmonic characteristic refers to the fact that the effective component of the AC power grid is a single power frequency, so any component that is different from the power frequency is classified as a harmonic characteristic.

[0113] The preset local density calculation formula is:

[0114]

[0115] where d c Cutoff distance, e is an exponential function,

[0116] The preset distance offset formula is:

[0117]

[0118] where ρ i The input data and sample are less than dc The number of ij is the distance between samples.

[0119] In an embodiment of the present application, after the harmonic feature quantity is calculated, the harmonic feature quantity is substituted into a preset local density calculation formula and a preset distance deviation formula to calculate the local density value and distance deviation value of the harmonic feature quantity.

[0120] Step 204: Calculate a first product of the distance deviation value and the local density value, and determine the first product as the cluster center index value.

[0121] The cluster center index value refers to a reference index used to determine whether the acquired current value is consistent with the true value.

[0122] In an embodiment of the present application, when the distance deviation value and the local density value are calculated, the first product of the distance deviation value and the local density value is calculated, and the first product is used as the cluster center index value to determine whether the obtained current value is consistent with the true current value.

[0123] Step 205: If the cluster center index value is greater than or equal to the preset cluster center index threshold, the basic data and the measurement data are compared to determine whether the measurement data is abnormal.

[0124] Furthermore, step 205 further includes the following sub-steps:

[0125] If the cluster center index value is greater than or equal to the preset cluster center index threshold, then determining whether the current value is less than the rated current value;

[0126] If the current value is greater than or equal to the rated current value, the measurement data is judged to be abnormal;

[0127] If the current value is less than the rated current value, then determine whether the voltage value is less than the rated voltage value;

[0128] If the voltage value is greater than or equal to the rated voltage value, the measurement data is judged to be abnormal;

[0129] If the voltage value is less than the rated voltage value, then determine whether the temperature and humidity values ​​are less than the rated temperature and humidity values;

[0130] If the temperature and humidity values ​​are greater than or equal to the rated temperature and humidity values, the measurement data is determined to be abnormal.

[0131] The current value refers to the real-time current value of the line where the damaged air switch is located, obtained by the current sensor.

[0132] The voltage value refers to the real-time voltage value of the line where the damaged air switch is located, obtained by the voltage sensor.

[0133] The temperature and humidity values ​​refer to the real-time temperature and humidity values ​​of the circuit where the damaged air switch is located, obtained by the temperature and humidity sensor.

[0134] The rated current value refers to the current value of the circuit breaker during normal operation, which is used to determine whether the current value obtained by the current sensor is abnormal.

[0135] The rated voltage value refers to the voltage value of the air switch during normal operation, which is used to determine whether the voltage value obtained by the voltage sensor is abnormal.

[0136] The rated temperature and humidity values ​​refer to the temperature and humidity values ​​of the air switch during normal operation. They are used to determine whether the temperature and humidity values ​​obtained by the temperature and humidity sensor are abnormal.

[0137] In an embodiment of the present application, when the calculated cluster center index value is greater than or equal to the preset cluster center index value threshold, it means that the acquired current value is the real current value, then judge whether the current value is less than the rated current value, if the current value is greater than or equal to the rated current value, then the current value in the line is abnormal, if the current value is less than the rated current value, then the line is operating normally, judge whether the voltage value is less than the rated voltage value, if the voltage value is greater than or equal to the rated voltage value, then the voltage value in the line is abnormal, if the voltage value is less than the rated voltage value, then the line is operating normally, judge whether the temperature and humidity value is less than the rated temperature and humidity value, if the temperature and humidity value is greater than or equal to the rated temperature and humidity value, then the temperature and humidity value in the line is abnormal, if the temperature and humidity value is less than or equal to the rated temperature and humidity value, then the line is operating normally.

[0138] Step 206: If the measurement data is determined to be abnormal, the circuit breaker is disconnected.

[0139] In an embodiment of the present application, when the current value, voltage value or temperature and humidity value are abnormal, it means that the line may be short-circuited, overloaded or leaking, and the circuit breaker of the line where the damaged air switch is located is disconnected.

[0140] In an embodiment of the present application, when the human-computer interaction module receives a line protection request, it extracts the air switch model parameters and the electrical circuit location of the damaged air switch in the line protection request, substitutes the model parameters into a preset Excel table, matches the rated current value, rated voltage value, and rated temperature and humidity value corresponding to the model parameters, and then obtains the current value, voltage value, and temperature and humidity value of the electrical circuit according to the location of the damaged air switch through a sensor. The obtained current value is extracted by a four-layer wavelet transform method. The harmonic characteristic value is substituted into a preset local density calculation formula and a preset distance deviation formula to calculate the local density value and distance deviation value of the harmonic characteristic value. The first product of the distance deviation value and the local density value is calculated, and the first product value is determined as the cluster center index value. It is determined whether the cluster center index value is greater than or equal to a preset cluster center index threshold. If the cluster center index value is greater than or equal to the preset cluster center index threshold, the measurement data is compared with the basic data to determine whether the measurement data is abnormal. If the measurement data is abnormal, the circuit breaker of the circuit where the damaged air switch is located is disconnected. This allows the busbar or low-voltage line to be directly connected when there is no air switch to replace, and can also disconnect the line in time when a short circuit, overload or leakage occurs in the low-voltage line or busbar, thereby improving the safety of the low-voltage line.

[0141] See also Figure 4 , Figure 4 This is a structural block diagram of a control system applied to a line protection device provided in the third embodiment of the present invention.

[0142] The present invention provides a control system for a line protection device, the line protection device includes a human-computer interaction module and a circuit breaker, the system includes

[0143] The data acquisition module 401 is used to extract the basic data corresponding to the line protection request when the human-computer interaction module receives the line protection request, and obtain the measurement data of the line where the damaged air switch is located;

[0144] An index value calculation module 402 is used to select current values ​​from the measurement data and calculate the cluster center index value of the current values;

[0145] The judgment and analysis module 403 is used to compare the basic data and the measurement data to determine whether the measurement data is abnormal if the cluster center index value is greater than or equal to the preset cluster center index threshold;

[0146] The execution module 404 is configured to disconnect the circuit breaker if it is determined that the measurement data is abnormal.

[0147] Optionally, the data acquisition module 401 includes:

[0148] The parameter extraction submodule 4011 is used to extract the model parameters and line location parameters of the damaged air switch in the line protection request when the human-computer interaction module receives the line protection request;

[0149] Matching submodule 4012, for inputting the model parameters into the preset data list and matching the target cells in the preset data list that correspond to the model parameters;

[0150] Basic data acquisition module 4013, used to obtain basic data in the target cell;

[0151] The measurement data acquisition module 4014 is used to determine the sensor corresponding to the location parameter and obtain the measurement data on the line through the sensor.

[0152] Optionally, the indicator value calculation module 402 includes:

[0153] The harmonic feature extraction submodule 4021 is used to select the current value in the measurement data and extract the harmonic feature of the current value through a four-layer wavelet transform method;

[0154] The harmonic feature calculation submodule 4022 is used to substitute the harmonic feature quantity into a preset local density calculation formula and a preset distance deviation formula to calculate the local density value and distance deviation value of the harmonic feature quantity;

[0155] The first product value calculation submodule 4023 is used to calculate a first product value of the distance deviation value and the local density value, and determine the first product value as the cluster center index value.

[0156] Optionally, the basic data includes rated current value, rated voltage value and rated temperature and humidity value. The measurement data includes current value, voltage value and temperature and humidity value, and the judgment and analysis module 303 includes:

[0157] The first judgment submodule 4031 is configured to judge whether the current value is less than the rated current value if the cluster center index value is greater than or equal to a preset cluster center index threshold.

[0158] The second judgment submodule 4032 is configured to determine that the measurement data is abnormal if the current value is greater than or equal to the rated current value.

[0159] The third judgment submodule 4033 is configured to judge whether the voltage value is less than the rated voltage value if the current value is less than the rated current value.

[0160] The fourth judgment submodule 4034 is configured to determine that the measurement data is abnormal if the voltage value is greater than or equal to the rated voltage value.

[0161] The fifth judgment submodule 4035 is configured to judge whether the temperature and humidity values ​​are less than the rated temperature and humidity values ​​if the voltage value is less than the rated voltage value.

[0162] The sixth judgment submodule 4036 is configured to determine that the measurement data is abnormal if the temperature and humidity values ​​are greater than or equal to the rated temperature and humidity values.

[0163] Furthermore, it also includes a jump module 405, which is used to jump to the execution step of extracting the basic data corresponding to the line protection request when the human-computer interaction module receives the line protection request if the cluster center index value is less than the preset cluster center index threshold, and obtaining the measurement data of the line where the damaged air switch is located.

[0164] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0165] In the several embodiments provided in this application, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0166] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0167] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0168] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for a line protection device, characterized in that: The line protection device includes a human-machine interaction module and a circuit breaker, and the method includes: When the human-computer interaction module receives a line protection request, it extracts basic data corresponding to the line protection request and obtains measurement data of the line where the damaged air switch is located; Selecting current values ​​from the measurement data and calculating cluster center index values ​​of the current values; If the cluster center index value is greater than or equal to a preset cluster center index threshold, comparing the basic data with the measurement data to determine whether the measurement data is abnormal; If it is determined that the measurement data is abnormal, disconnecting the circuit breaker; The step of selecting the current value in the measurement data and calculating the cluster center index value of the current value includes: Selecting a current value from the measurement data, and extracting a harmonic characteristic quantity of the current value by a four-layer wavelet transform method; Substituting the harmonic characteristic quantity into a preset local density calculation formula and a preset distance deviation formula to calculate the local density value and the distance deviation value of the harmonic characteristic quantity; A first product of the distance deviation value and the local density value is calculated, and the first product is determined as a cluster center index value.

2. The control method for a line protection device according to claim 1, characterized in that: When the human-computer interaction module receives a line protection request, the step of extracting basic data corresponding to the line protection request and obtaining measurement data of the line where the damaged air switch is located includes: When the human-computer interaction module receives a line protection request, it extracts the model parameters and line location parameters of the damaged air switch in the line protection request; Input the model parameter into a preset data list, and match the target cell in the preset data list that corresponds to the model parameter; Obtaining basic data in the target cell; A sensor corresponding to the location parameter is determined, and measurement data on the line is acquired through the sensor.

3. The control method for a line protection device according to claim 1, characterized in that: The basic data includes a rated current value, a rated voltage value, and a rated temperature and humidity value; the measurement data includes a current value, a voltage value, and a temperature and humidity value; if the cluster center index value is greater than or equal to a preset cluster center index threshold, the step of comparing the basic data and the measurement data to determine whether the measurement data is abnormal includes: If the cluster center index value is greater than or equal to a preset cluster center index threshold, determining whether the current value is less than the rated current value; If the current value is greater than or equal to the rated current value, determining that the measurement data is abnormal; If the current value is less than the rated current value, determining whether the voltage value is less than the rated voltage value; If the voltage value is greater than or equal to the rated voltage value, determining that the measurement data is abnormal; If the voltage value is less than the rated voltage value, determining whether the temperature and humidity values ​​are less than the rated temperature and humidity values; If the temperature and humidity value is greater than or equal to the rated temperature and humidity value, the measurement data is determined to be abnormal.

4. The control method for a line protection device according to claim 1, characterized in that: The steps further include: If the cluster center index value is less than the preset cluster center index threshold, the process jumps to execute the step of extracting the basic data corresponding to the line protection request when the human-computer interaction module receives the line protection request, and obtaining the measurement data of the line where the damaged air switch is located.

5. A control system applied to a line protection device, characterized in that: The line protection device includes a human-machine interaction module and a circuit breaker, and the system includes: A data acquisition module, configured to extract basic data corresponding to a line protection request when the human-computer interaction module receives the line protection request, and obtain measurement data of the line where the damaged air switch is located; An index value calculation module, configured to select a current value from the measurement data and calculate a cluster center index value of the current value; a judgment and analysis module, configured to compare the basic data with the measurement data to determine whether the measurement data is abnormal if the cluster center index value is greater than or equal to a preset cluster center index threshold; an execution module, configured to disconnect the circuit breaker if it is determined that the measurement data is abnormal; The indicator value calculation module includes: A harmonic feature extraction submodule is used to select a current value in the measurement data and extract a harmonic feature of the current value by a four-layer wavelet transform method; A harmonic feature calculation submodule, configured to substitute the harmonic feature into a preset local density calculation formula and a preset distance deviation formula to calculate a local density value and a distance deviation value of the harmonic feature; The first multiplication value calculation submodule is used to calculate a first multiplication value of the distance deviation value and the local density value, and determine the first multiplication value as a cluster center index value.

6. The control system for a line protection device according to claim 5, characterized in that: The data acquisition module includes: A parameter extraction submodule, configured to extract the model parameters and line location parameters of the damaged air switch in the line protection request when the human-computer interaction module receives the line protection request; A matching submodule, configured to input the model parameters into a preset data list and match target cells in the preset data list that correspond to the model parameters; A basic data acquisition module, used to obtain basic data in the target cell; The measurement data acquisition module is used to determine the sensor corresponding to the position parameter and obtain the measurement data on the line through the sensor.

7. The control system for a line protection device according to claim 5, characterized in that: The basic data include rated current value, rated voltage value and rated temperature and humidity value; the measurement data include current value, voltage value and temperature and humidity value; The judgment and analysis module includes: a first judgment submodule, configured to judge whether the current value is less than the rated current value if the cluster center index value is greater than or equal to a preset cluster center index threshold; a second judgment submodule, configured to determine that the measurement data is abnormal if the current value is greater than or equal to the rated current value; a third judgment submodule, configured to judge whether the voltage value is less than the rated voltage value if the current value is less than the rated current value; a fourth judgment submodule, configured to determine that the measurement data is abnormal if the voltage value is greater than or equal to the rated voltage value; a fifth judgment submodule, configured to judge whether the temperature and humidity values ​​are less than the rated temperature and humidity values ​​if the voltage value is less than the rated voltage value; The sixth judgment submodule is configured to determine that the measurement data is abnormal if the temperature and humidity values ​​are greater than or equal to the rated temperature and humidity values.

8. The control system for a line protection device according to claim 5, characterized in that: Also includes: A jump module is used to jump to execute the steps of extracting the basic data corresponding to the line protection request and obtaining the measurement data of the line where the damaged air switch is located when the human-computer interaction module receives the line protection request if the cluster center index value is less than the preset cluster center index threshold.

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