High-voltage circuit breaker fault diagnosis and safety protection method and system

Abstract

The invention discloses a high-voltage circuit breaker fault diagnosis and safety protection method and system, and the method comprises the steps: obtaining a test sample in a circuit breaker driven by a motor; performing fault judgment by using the fault diagnosis model; and performing fault diagnosis and safety protection on the circuit breaker according to the fault state. Through the high-voltage circuit breaker fault diagnosis and safety protection method, the high-voltage circuit breaker is accurately diagnosed and reliably protected, and the accuracy of circuit breaker fault diagnosis and the reliability of safety protection can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage switches, and in particular to a method and system for fault diagnosis and safety protection of a high-voltage circuit breaker. Background Art

[0002] As one of the core devices in the power system, high-voltage circuit breakers are responsible for controlling the on-off of circuits and quickly cutting off current in the event of a fault. They are crucial to ensuring the safe and stable operation of the power grid. However, in practical applications, high-voltage circuit breakers are prone to various faults due to factors such as harsh working environments, frequent operations, and long-term operation. These faults not only affect the performance of the circuit breaker itself, but may also cause more serious power accidents, such as local or even large-scale power outages, causing significant losses to the society and economy. In order to overcome the above challenges, scholars have studied a variety of methods: support vector machines, artificial neural networks, extreme learning machines, deep learning, etc., but these methods are difficult to take into account the needs of circuit breaker fault diagnosis and safety protection, and reduce the occurrence of faults. Therefore, it is necessary to study the fault diagnosis and safety protection methods of high-voltage circuit breakers to improve the accuracy of circuit breaker fault diagnosis and the reliability of safety protection. Summary of the invention

[0003] In view of the above-mentioned problems, the present invention is proposed.

[0004] The technical problem solved by the present invention is that the prior art has poor accuracy and reliability in high-voltage circuit breaker fault diagnosis.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a high voltage circuit breaker fault diagnosis and safety protection method, comprising:

[0006] In a motor-driven circuit breaker, obtaining a test sample;

[0007] Use the fault diagnosis model to make fault judgment;

[0008] Perform fault diagnosis and safety protection on the circuit breaker according to the fault status.

[0009] As a preferred solution of the high-voltage circuit breaker fault diagnosis and safety protection method of the present invention, wherein: the test sample includes selecting multiple sampling channels of current, voltage, temperature, speed, torque, and position, and calculating characteristic values ​​of the sampling channels as samples;

[0010] In the event of a fault, the characteristic values ​​of the sampling channel are input into the pre-trained APSO-PNN fault diagnosis model to identify the fault type;

[0011] In the absence of a fault, a logical judgment is made on the characteristic values ​​of the sampling channel and the corresponding protection strategy is executed.

[0012] As a preferred solution of the high-voltage circuit breaker fault diagnosis and safety protection method of the present invention, the training method of the APSO-PNN fault diagnosis model includes:

[0013] Normalize the sample data to obtain training samples;

[0014] The PNN algorithm is used to build the network model, and the adaptive particle swarm optimization algorithm APSO is used to obtain the optimal smoothness parameters of the PNN model;

[0015] Based on the optimal smoothness parameter of PNN, the PNN model is trained and the APSO-PNN fault diagnosis model is established.

[0016] As a preferred solution of the high-voltage circuit breaker fault diagnosis and safety protection method of the present invention, the training of the PNN model includes:

[0017] Establish a 4-layer probabilistic neural network model to classify input samples;

[0018] The method for acquiring the 4-layer probabilistic neural network includes:

[0019] The input layer accepts the input feature vector and passes it to the pattern layer;

[0020] The Gaussian function is selected as the kernel function of the pattern layer. The number of pattern layers is the number of feature vectors, and the number of neuron nodes is the number of fault types. The matching degree between the input feature vector and each pattern is calculated, which is expressed as:

[0021]

[0022] Where x is the input feature vector, ij represents the jth fault type of the ith feature vector, i = 1, 2, ..., p, j = 1, 2, ..., q, y ij represents the matching degree between x and the jth fault type of the i-th feature vector, x ij is the center position of the jth neuron node in the i-th pattern layer, p is the total number of input feature vectors, q is the total number of fault types in the output layer, d is the dimension of the input feature vector, and σ is the smoothness parameter;

[0023] The probability of the output results of the same fault type in the mode layer is accumulated and summed to obtain the probability density function of each fault type, which is expressed as:

[0024]

[0025] Where, L J is the total number of samples of the jth fault type, gj represents the probability density of the jth fault type;

[0026] The maximum output of the summation layer is taken as the output result of the output layer, which is expressed as:

[0027] Y = argmax(g j )

[0028] In the formula, argmax(g j ) means g j The value of j when the value of is maximum.

[0029] As a preferred solution of the high-voltage circuit breaker fault diagnosis and safety protection method of the present invention, wherein: the logical judgment of the characteristic value of the sampling channel and the execution of the corresponding protection strategy include:

[0030] Compare the effective value or instantaneous value of the current with the current setting value, and execute three-stage current protection if the conditions are met;

[0031] Compare the voltage effective value with the voltage setting value, and execute voltage protection if the conditions are met;

[0032] Compare the temperature with the temperature setting value, and execute temperature protection if the conditions are met.

[0033] As a preferred solution of the high-voltage circuit breaker fault diagnosis and safety protection method of the present invention, wherein: the execution of the three-stage current protection includes: when the current effective value I exceeds 1.05 times the rated current I N , the circuit breaker turns on the overload long delay protection state, and the timer starts timing t 1 ;

[0034] At 0~t 1 Within the time range, if the effective current value remains at 1.05I N <I<I m1 , t 1 At this moment, the circuit breaker executes the tripping command, the line is interrupted, and an alarm message is output;

[0035] Among them, I m1 It is the upper limit of the setting value of overload long-time delay protection;

[0036] If the effective value of the current returns to normal, the timer is reset;

[0037] When the effective value of the current exceeds I m1 , the circuit breaker turns on the short-circuit short-delay protection state;

[0038] If the effective current range is I m1 <I<8I N, the circuit breaker performs inverse time protection, and the timer starts timing t 2 ;

[0039] At 0~t 2 Within the time range, if the effective current value remains at I m1 <I<8I N , t 2 At this moment, the circuit breaker executes the tripping command, the line is interrupted, and an alarm message is output;

[0040] If the effective value of the current is reduced to 1.05I N <I<I m1 , the circuit breaker performs overload long-delay protection, and the timer is not reset;

[0041] If the effective value of the current returns to normal, the timer is reset;

[0042] If the current effective value range is 8I N <I<10I N , the circuit breaker performs time-limit protection, and the timer starts timing t 3 ;

[0043] At 0~t 3 Within the time range, if the effective current value remains at 8I N <I<10I N , t 3 At this moment, the circuit breaker executes the tripping command, the line is interrupted, and an alarm message is output;

[0044] If the effective value of the current drops to I m1 <I<8I N , the circuit breaker performs inverse time protection, and the timer is not reset;

[0045] If the effective value of the current returns to normal, the timer is reset;

[0046] When the instantaneous current value I m More than 12I N , the circuit breaker performs instantaneous protection, the circuit breaker executes the tripping instruction, the line is interrupted, and the alarm information is output.

[0047] As a preferred solution of the high-voltage circuit breaker fault diagnosis and safety protection method of the present invention, the voltage protection includes:

[0048] When the voltage RMS U exceeds 1.1 times the rated voltage U N , the circuit breaker turns on the overvoltage protection state, and the timer starts timing t 4 ;

[0049] When the voltage RMS U is lower than 0.9 times the rated voltage U N, the circuit breaker turns on the undervoltage protection state, and the timer starts timing t 4 ;

[0050] At 0~t 4 Within the time range, if the voltage RMS value remains at U>1.1U N ∪U<0.9U N , t 4 At this moment, the circuit breaker executes the tripping command, the line is interrupted, and an alarm message is output;

[0051] If the voltage effective value returns to normal, the timer is reset;

[0052] The execution of temperature protection comprises:

[0053] When the temperature T exceeds the maximum temperature T 1 , the circuit breaker turns on the temperature protection state, and the timer starts timing t 5 ;

[0054] When the temperature T is lower than the maximum temperature T 2 , the circuit breaker turns on the temperature protection state, and the timer starts timing t 5 ;

[0055] At 0~t 5 Within the time range, if the temperature is maintained at T>T 1 ∪T<T 2 , t 5 At this moment, the circuit breaker executes the tripping command, the line is interrupted, and an alarm message is output;

[0056] If the temperature returns to normal, the timer will be reset.

[0057] A high-voltage circuit breaker fault diagnosis and safety protection system using the method of the present invention is characterized by:

[0058] A collection unit, in a motor-driven circuit breaker, obtains a test sample;

[0059] The judgment unit uses the fault diagnosis model to make fault judgment;

[0060] The diagnostic unit performs fault diagnosis and safety protection on the circuit breaker according to the fault status.

[0061] A computer device comprises: a memory and a processor; the memory stores a computer program, wherein: the processor implements the steps of any one of the methods of the present invention when executing the computer program.

[0062] A computer-readable storage medium stores a computer program, wherein: when the computer program is executed by a processor, the steps of any one of the methods of the present invention are implemented.

[0063] Beneficial effects of the present invention: The high-voltage circuit breaker fault diagnosis and safety protection method provided by the present invention establishes an APSO-PNN fault diagnosis model to quickly and accurately judge the high-voltage circuit breaker fault, and combines the three-stage current protection, voltage protection, and temperature protection strategies to provide protection for the safe and stable operation of the high-voltage circuit breaker, thereby improving the accuracy of circuit breaker fault diagnosis and the reliability of safe operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0065] Figure 1 An overall flow chart of a high-voltage circuit breaker fault diagnosis and safety protection method provided for the first embodiment of the present invention.

[0066] Figure 2 The present invention provides a flowchart of a high-voltage circuit breaker fault diagnosis method. DETAILED DESCRIPTION

[0067] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0068] Example 1, reference Figure 1 , as an embodiment of the present invention, provides a high-voltage circuit breaker fault diagnosis and safety protection method, comprising:

[0069] The acquired test samples are monitored to determine whether a fault occurs, and the circuit breaker is diagnosed or protected according to the fault status.

[0070] Wherein, the test sample includes:

[0071] For motor-driven circuit breakers, multiple sampling channels of current, voltage, temperature, speed, torque, and position are selected according to actual needs, and the characteristic values ​​(instantaneous values ​​or effective values) of the sampling channels are calculated as samples.

[0072] The determining whether a fault occurs and performing safety protection or fault diagnosis on the circuit breaker according to the fault state includes:

[0073] In the event of a fault, the characteristic values ​​of the sampling channels are input into the pre-trained APSO-PNN fault diagnosis model to identify the fault type.

[0074] In the absence of a fault, a logical judgment is made on the characteristic values ​​of the sampling channel and the corresponding protection strategy is executed.

[0075] like Figure 1 As shown, the high-voltage circuit breaker fault diagnosis and safety protection method provided in this embodiment specifically involves the following steps:

[0076] S1: For the motor-driven circuit breaker, select multiple sampling channels of current, voltage, temperature, speed, torque, and position according to actual needs, and calculate the characteristic value (instantaneous value or effective value) of the sampling channel as a sample.

[0077] For motor-driven high-voltage circuit breakers, the motor is directly connected to the circuit breaker. The motor current, voltage, speed, position and other information can timely reflect the load, power quality, circuit breaker opening / closing action speed, circuit breaker opening / closing status and other conditions, which is crucial to ensure the working safety and reliability of high-voltage circuit breakers and reduce circuit breaker failures. Therefore, multiple sampling channels of current, voltage, temperature, speed, torque and position can be selected according to the actual needs of high-voltage circuit breaker models, working environments, etc., and the characteristic values ​​of the sampling channels can be calculated as samples.

[0078] S2: Determine whether the high-voltage circuit breaker fails, and perform safety protection or fault diagnosis on the circuit breaker according to the fault status.

[0079] Among them, the circuit breaker is protected or diagnosed according to the fault state, including:

[0080] If the circuit breaker fails, the characteristic values ​​of the sampling channel are input into the pre-trained APSO-PNN fault diagnosis model to identify the fault type. If the circuit breaker does not fail, the characteristic values ​​of the sampling channel are logically judged and the corresponding protection strategy is executed.

[0081] The present invention provides a high-voltage circuit breaker fault diagnosis and safety protection method, which can accurately diagnose and reliably protect the high-voltage circuit breaker, and can improve the accuracy of circuit breaker fault diagnosis and the reliability of safety protection.

[0082] Embodiment 2 introduces a high-voltage circuit breaker fault diagnosis method, comprising:

[0083] In the event of a high-voltage circuit breaker failure, the characteristic values ​​of the sampling channels are input into the pre-trained APSO-PNN fault diagnosis model to identify the fault type.

[0084] like Figure 2As shown, the high-voltage circuit breaker fault diagnosis model provided in this embodiment, its application process specifically involves the following steps:

[0085] S1: Normalize the sample data, initialize the parameters of the probabilistic neural network PNN, and establish the PNN network model.

[0086] Among them, the method of establishing the PNN model can be expressed as:

[0087] Step 1: Input layer. The input layer accepts the input feature vector and passes it to the pattern layer.

[0088] Step 2: Pattern layer. Select the Gaussian function as the kernel function of the pattern layer. The number of pattern layers is the number of feature vectors, and the number of neuron nodes is the number of fault types. Calculate the matching degree between the input feature vector and each pattern, expressed as:

[0089]

[0090] Where x is the input feature vector, ij represents the jth fault type of the ith feature vector, i = 1, 2, ..., p, j = 1, 2, ..., q, y ij represents the matching degree between x and the jth fault type of the i-th feature vector, x ij is the center position of the jth neuron node in the ith pattern layer, p is the total number of input feature vectors, q is the total number of fault types in the output layer, d is the dimension of the input feature vector, and σ is the smoothness parameter.

[0091] Step 3: Sum layer. Accumulate and sum the output results of the same fault type in the pattern layer to obtain the probability density function of each fault type, expressed as:

[0092]

[0093] Where, L J is the total number of samples of the jth fault type, g j Represents the probability density of the jth fault type.

[0094] Step 4: Output layer. The maximum output of the summation layer is used as the output result of the output layer, expressed as:

[0095] Y = argmax(g j )

[0096] In the formula, argmax(g j ) means g j The value of j when the value of is maximum.

[0097] S2: Use the adaptive particle swarm optimization algorithm APSO to optimize the smoothness parameters of the probabilistic neural network PNN.

[0098] Among them, the steps of adaptive particle swarm optimization algorithm are:

[0099] Step 1: Initialize parameters. Set the relevant parameters in the APSO algorithm, randomly initialize the positions and velocities of all particles in the D-dimensional search space, and assume that there are n particles in the particle swarm. The position and velocity of the kth particle can be expressed as:

[0100] s k =(s k1 ,s k2 ,…,s kD )

[0101] v k =(v k1 ,v k2 ,…,v kD )

[0102] Where k = 1, 2, ..., n, s ke is the position component of the particle in the e dimension, v ke is the velocity component of the particle in the e dimension, e=1,2,…,D.

[0103] Step 2: Calculate the fitness. Calculate the fitness values ​​of all particles. The optimal fitness value of the kth particle, that is, the individual optimal value, can be expressed as:

[0104] P best =(P best1 ,P best2 ,…,P bestD )

[0105] The optimal fitness value of all particles, that is, the global optimal value, can be expressed as:

[0106] G best =(G best1 ,G best2 ,…,G bestD )

[0107] Step 3: Search iteration. Update the particle position and velocity according to the individual optimal value and global optimal value of the particle swarm, which can be expressed as:

[0108]

[0109]

[0110] In the formula, represents the position component of the kth particle in the e dimension during the ath search process, represents the velocity component of the kth particle in the e-dimensional space during the a-th search process, a=1,2,…,A, a is the current iteration number of the particle, A is the total number of iterations, c 1 is the individual particle learning factor, c 2 is the particle global learning factor, r 1 and r 2 is a random number in [0,1].

[0111] If the termination condition is not met, the iteration is repeated, the particle position and velocity are updated, and the individual optimal value and the global optimal value are re-searched. If the termination condition is met, the optimal solution, i.e., the smoothness parameter, is output.

[0112] S3: Based on the optimized smoothness parameters, an APSO-PNN fault diagnosis model is established to identify faults of samples and output fault diagnosis results.

[0113] The present invention provides a high-voltage circuit breaker fault diagnosis method, which combines a PNN model and an APSO optimization algorithm to establish an APSO-PNN fault diagnosis model, so as to quickly and accurately diagnose high-voltage circuit breaker faults and improve the accuracy and efficiency of circuit breaker fault diagnosis.

[0114] Embodiment 3 introduces a high-voltage circuit breaker safety protection method, comprising:

[0115] When the high-voltage circuit breaker does not fail, a logical judgment is made on the characteristic values ​​of the sampling channels and a corresponding protection strategy is executed.

[0116] The application process of the high-voltage circuit breaker safety protection method provided in this embodiment specifically involves the following steps:

[0117] S1: Compare the effective value or instantaneous value of the current with the current setting value, and execute three-stage current protection if the conditions are met.

[0118] Step 1: Overload long delay protection. When the effective current I exceeds 1.05 times the rated current I N , the circuit breaker turns on the overload long delay protection state, and the timer starts timing t 1 .

[0119] At 0~t 1 Within the time range, if the effective current value remains at 1.05I N <I<I m1 , t 1 At this moment, the circuit breaker executes the tripping command, the line is interrupted, and an alarm message is output.

[0120] Among them, I m1 It is the upper limit of the overload long-time delay protection setting value, generally 5I N .

[0121] If the effective current value returns to normal, the timer is reset.

[0122] Step 2: Short circuit short delay protection. When the effective value of the current exceeds I m1 , the circuit breaker turns on the short-circuit short-delay protection state.

[0123] If the current effective value range is I m1 <I<8I N , the circuit breaker performs inverse time protection, and the timer starts timing t 2 .

[0124] At 0~t 2 Within the time range, if the effective current value remains at I m1 <I<8I N , t 2 At this moment, the circuit breaker executes the tripping command, the line is interrupted, and an alarm message is output.

[0125] If the effective value of the current is reduced to 1.05I N <I<I m1 , the circuit breaker performs overload long delay protection and the timer is not reset.

[0126] If the effective current value returns to normal, the timer is reset.

[0127] If the current effective value range is 8I N <I<10I N , the circuit breaker performs time-limit protection, and the timer starts timing t 3 .

[0128] At 0~t 3 Within the time range, if the effective current value remains at 8I N <I<10I N , t 3 At this moment, the circuit breaker executes the tripping command, the line is interrupted, and an alarm message is output.

[0129] If the effective value of the current drops to I m1 <I<8I N , the circuit breaker performs inverse time protection and the timer is not reset.

[0130] If the effective current value returns to normal, the timer is reset.

[0131] Step 3: Instantaneous protection. When the instantaneous value of current I m More than 12I N , the circuit breaker performs instantaneous protection, the circuit breaker executes the tripping instruction, the line is interrupted, and the alarm information is output.

[0132] S2: Compare the voltage effective value with the voltage setting value, and execute voltage protection if the conditions are met.

[0133] When the voltage RMS U exceeds 1.1 times the rated voltage U N , the circuit breaker turns on the overvoltage protection state, and the timer starts timing t 4 .

[0134] When the voltage RMS U is lower than 0.9 times the rated voltage U N , the circuit breaker turns on the undervoltage protection state, and the timer starts timing t 4 .

[0135] At 0~t 4 Within the time range, if the voltage RMS value remains at U>1.1U N ∪U<0.9U N , t 4 At this moment, the circuit breaker executes the tripping command, the line is interrupted, and an alarm message is output.

[0136] If the voltage RMS value returns to normal, the timer is reset.

[0137] S3: Compare the temperature with the temperature setting value, and execute temperature protection if the conditions are met.

[0138] When the temperature T exceeds the maximum temperature T 1 , the circuit breaker turns on the temperature protection state, and the timer starts timing t 5 .

[0139] When the temperature T is lower than the maximum temperature T 2 , the circuit breaker turns on the temperature protection state, and the timer starts timing t 5 .

[0140] At 0~t 5 Within the time range, if the temperature is maintained at T>T 1 ∪T<T 2 , t 5 At this moment, the circuit breaker executes the tripping command, the line is interrupted, and an alarm message is output.

[0141] If the temperature returns to normal, the timer is reset.

[0142] On the other hand, this embodiment also provides a high-voltage circuit breaker fault diagnosis and safety protection system, which includes:

[0143] The acquisition unit obtains the test sample in the motor-driven circuit breaker.

[0144] The judgment unit makes fault judgment by using the fault diagnosis model.

[0145] The diagnostic unit performs fault diagnosis and safety protection on the circuit breaker according to the fault status.

[0146] If the above functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program code.

[0147] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0148] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0149] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0150] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A high voltage circuit breaker fault diagnosis and safety protection method, characterized in that: include: In a motor-driven circuit breaker, obtaining a test sample; Use the fault diagnosis model to make fault judgment; Perform fault diagnosis and safety protection on the circuit breaker according to the fault status.

2. The high voltage circuit breaker fault diagnosis and safety protection method according to claim 1, characterized in that: The test sample includes selecting a plurality of sampling channels among current, voltage, temperature, rotation speed, torque, and position, and calculating characteristic values ​​of the sampling channels as samples; In the event of a fault, the characteristic values ​​of the sampling channel are input into the pre-trained APSO-PNN fault diagnosis model to identify the fault type; In the absence of a fault, a logical judgment is made on the characteristic values ​​of the sampling channel and the corresponding protection strategy is executed.

3. The high voltage circuit breaker fault diagnosis and safety protection method according to claim 2, characterized in that: The training method of the APSO-PNN fault diagnosis model comprises: Normalize the sample data to obtain training samples; The PNN algorithm is used to build the network model, and the adaptive particle swarm optimization algorithm APSO is used to obtain the optimal smoothness parameters of the PNN model; Based on the optimal smoothness parameter of PNN, the PNN model is trained and the APSO-PNN fault diagnosis model is established.

4. The high voltage circuit breaker fault diagnosis and safety protection method according to claim 3, characterized in that: The training of the PNN model includes: Establish a 4-layer probabilistic neural network model to classify input samples; The method for acquiring the 4-layer probabilistic neural network includes: The input layer accepts the input feature vector and passes it to the pattern layer; The Gaussian function is selected as the kernel function of the pattern layer. The number of pattern layers is the number of feature vectors, and the number of neuron nodes is the number of fault types. The matching degree between the input feature vector and each pattern is calculated, which is expressed as: Where x is the input feature vector, ij represents the jth fault type of the ith feature vector, i = 1, 2, ..., p, j = 1, 2, ..., q, y ij represents the matching degree between x and the jth fault type of the i-th feature vector, x ij is the center position of the jth neuron node in the i-th pattern layer, p is the total number of input feature vectors, q is the total number of fault types in the output layer, d is the dimension of the input feature vector, and σ is the smoothness parameter; The probability of the output results of the same fault type in the mode layer is accumulated and summed to obtain the probability density function of each fault type, which is expressed as: Where, L J is the total number of samples of the jth fault type, g j represents the probability density of the jth fault type; The maximum output of the summation layer is taken as the output result of the output layer, which is expressed as: Y=argmax(g j ) In the formula, argmax(g j ) means g j The value of j when the value of is maximum.

5. The high voltage circuit breaker fault diagnosis and safety protection method according to claim 4, characterized in that: The logical judgment of the characteristic value of the sampling channel and the execution of the corresponding protection strategy include: Compare the effective value or instantaneous value of the current with the current setting value, and execute three-stage current protection if the conditions are met; Compare the voltage effective value with the voltage setting value, and execute voltage protection if the conditions are met; Compare the temperature with the temperature setting value, and execute temperature protection if the conditions are met.

6. The high voltage circuit breaker fault diagnosis and safety protection method according to claim 5, characterized in that: The three-stage current protection includes: when the effective current value I exceeds 1.05 times the rated current I N , the circuit breaker turns on the overload long delay protection state, and the timer starts timing t1; In the time range of 0 to t1, if the effective value of the current remains at 1.05I N <I<I m1 , at time t1, the circuit breaker executes the tripping command, the line is interrupted, and the alarm information is output; Among them, I m1 It is the upper limit of the setting value of overload long-time delay protection; If the effective value of the current returns to normal, the timer is reset; When the effective current exceeds I m1 , the circuit breaker turns on the short-circuit short-delay protection state; If the effective current range is I m1 <I<8I N , the circuit breaker performs inverse time protection, and the timer starts timing t2; In the time range of 0 to t2, if the effective value of the current remains at I m1 <I<8I N At time t2, the circuit breaker executes the tripping command, the line is interrupted, and an alarm message is output; If the effective value of the current is reduced to 1.05I N <I<I m1 , the circuit breaker performs overload long-delay protection, and the timer is not reset; If the effective value of the current returns to normal, the timer is reset; If the current effective value range is 8I N <I<10I N , the circuit breaker performs time-limit protection, and the timer starts timing t3; In the time range of 0 to t3, if the effective value of the current remains at 8I N <I<10I N At time t3, the circuit breaker executes the tripping command, the line is interrupted, and an alarm message is output; If the effective value of the current drops to I m1 <I<8I N , the circuit breaker performs inverse time protection, and the timer is not reset; If the effective value of the current returns to normal, the timer is reset; When the instantaneous current value I m More than 12I N , the circuit breaker performs instantaneous protection, the circuit breaker executes the tripping instruction, the line is interrupted, and the alarm information is output.

7. The high voltage circuit breaker fault diagnosis and safety protection method according to claim 6, characterized in that: The voltage protection comprises: When the voltage RMS U exceeds 1.1 times the rated voltage U N , the circuit breaker turns on the overvoltage protection state, and the timer starts timing t4; When the voltage RMS U is lower than 0.9 times the rated voltage U N , the circuit breaker turns on the undervoltage protection state, and the timer starts timing t4; In the time range of 0 to t4, if the voltage RMS value remains at U>1.1U N ∪U<0.9U N At time t4, the circuit breaker executes the tripping command, the line is interrupted, and an alarm message is output; If the voltage effective value returns to normal, the timer is reset; The execution of temperature protection comprises: When the temperature T exceeds the maximum temperature T1, the circuit breaker turns on the temperature protection state and the timer starts timing t5; When the temperature T is lower than the maximum temperature T2, the circuit breaker turns on the temperature protection state and the timer starts timing t5; In the time range of 0 to t5, if the temperature remains at T>T1∪T<T2, at t5, the circuit breaker executes the tripping command, the line is interrupted, and an alarm message is output; If the temperature returns to normal, the timer will be reset.

8. A high voltage circuit breaker fault diagnosis and safety protection system using the method according to any one of claims 1 to 7, characterized in that: A collection unit, in a motor-driven circuit breaker, obtains a test sample; The judgment unit uses the fault diagnosis model to make fault judgment; The diagnostic unit performs fault diagnosis and safety protection on the circuit breaker according to the fault status.

9. A computer device comprising: A memory and a processor; the memory stores a computer program, wherein the processor implements the steps of any method as claimed in claim 1 when executing the computer program.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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