CN-121995209-A - Method and device for analyzing faults of pole-mounted circuit breaker

CN121995209ACN 121995209 ACN121995209 ACN 121995209ACN-121995209-A

Abstract

The application provides a method and a device for analyzing faults of a pole-mounted circuit breaker, which belong to the field of power distribution switch control equipment, and the method comprises the steps of obtaining multisource parameters of the circuit breaker and environmental parameters monitored in real time, carrying out time synchronization processing on the multisource parameters to obtain multisource signal data aligned in time, and extracting a first initial feature vector and a second initial feature vector based on the multisource signal data; the method comprises the steps of determining an environment correction factor according to environment parameters, determining a dynamic reference feature fingerprint according to a current feature value and the environment correction factor, obtaining deviation degree and consistency degree according to a first initial feature vector and the dynamic reference feature fingerprint, and determining whether a circuit breaker has faults or not according to the deviation degree and the consistency degree and through a hierarchical decision mechanism. The breaker fault analysis method and device provided by the application can improve the fault detection speed and precision of the breaker.

Inventors

CHEN YARU
LIU SHAOXING
DUAN YULI

Assignees

石家庄华天科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260225

Claims (10)

1.A method of analyzing a fault of a pole-mounted circuit breaker, comprising: Acquiring a multisource parameter and a real-time monitored environment parameter of a breaker, performing time synchronization processing on the multisource parameter to acquire time-aligned multisource signal data, and extracting a first initial feature vector and a second initial feature vector based on the multisource signal data, wherein the multisource parameter comprises an operation coil current, a main loop current, a vibration acceleration and a moving contact displacement, the environment parameter comprises temperature and humidity, and the first initial feature vector comprises an electromagnetic force feature value, a mechanical movement speed feature value and a mechanical impact feature value; determining an environmental correction factor according to the environmental parameter; Determining a dynamic reference characteristic fingerprint according to the current characteristic value and the environment correction factor, wherein the dynamic reference characteristic fingerprint is used for representing the characteristic value which is required to be represented by a healthy circuit breaker under the current operation working condition; Obtaining a deviation degree and a consistency degree according to the first initial feature vector and the dynamic reference feature fingerprint, wherein the deviation degree is used for representing the degree of each feature value deviating from a health standard, and the consistency degree is used for representing the consistency degree of a physical relationship between the feature values; And determining whether the breaker has faults or not through a hierarchical decision mechanism according to the deviation degree and the consistency degree.
2. The method of claim 1, wherein determining a dynamic reference signature based on the signature of the main loop current and the environmental correction factor comprises: Determining a current operation condition according to the main loop current and the environment correction factor; Inquiring an electromagnetic force reference value, a mechanical movement speed reference value and a mechanical impact reference value corresponding to the current operation working condition according to a preset health reference database, wherein the preset health reference database is used for representing the corresponding relation among the electromagnetic force reference value, the mechanical movement speed reference value and the mechanical impact reference value under different working conditions; And combining the electromagnetic force reference value, the mechanical movement speed reference value and the mechanical impact reference value to obtain the dynamic reference characteristic fingerprint.
3. The method of claim 2, wherein the degree of deviation comprises a first degree of deviation, a second degree of deviation, and a third degree of deviation, the degree of consistency comprising a first degree of consistency and a second degree of consistency; The obtaining the deviation degree and the consistency degree according to the first initial feature vector and the dynamic reference feature fingerprint comprises the following steps: Determining a first deviation degree according to the deviation between the electromagnetic force characteristic value and the corresponding reference value; determining a second deviation degree according to the deviation between the mechanical movement speed characteristic value and the corresponding reference value; Determining a third deviation degree according to the deviation between the mechanical impact characteristic value and the corresponding reference value; Detecting consistency between the electromagnetic force characteristic value and the mechanical movement speed characteristic value to obtain a first consistency degree; and detecting the consistency between the mechanical movement speed characteristic value and the mechanical impact characteristic value to obtain a second consistency degree.
4. A method as claimed in claim 3, wherein said detecting the correspondence between said electromagnetic force characteristic value and the mechanical movement speed characteristic value, obtaining a first degree of correspondence, comprises: Integrating according to the curve of the electromagnetic force characteristic value changing along with time to obtain an electromagnetic impulse characteristic value, wherein the electromagnetic impulse characteristic value is used for representing the proportional relation between electromagnetic impulse and mechanical movement speed; According to the electromagnetic impulse characteristic value, the environment correction factor and the impulse speed conversion coefficient, obtaining a mechanical movement speed characteristic theoretical value through a mechanical movement speed characteristic theoretical value calculation formula, wherein the mechanical movement speed characteristic theoretical value calculation formula is that , wherein, Represents the characteristic theoretical value of the mechanical movement speed, Representing the impulse velocity conversion coefficient, The environmental correction factor is represented as such, Representing electromagnetic impulse characteristic values; Determining a first degree of consistency according to the degree of deviation of the mechanical movement speed characteristic value from the mechanical movement speed characteristic theoretical value; wherein, detect the uniformity between the mechanical motion speed characteristic value and the mechanical impact characteristic value, obtain a second degree of uniformity, include: Determining a theoretical expected value of mechanical impact characteristics according to the mechanical motion speed characteristic value and a preset impact reference value; a second degree of consistency is determined based on a degree of deviation of the mechanical impact characteristic value from a theoretical expected value of the mechanical impact characteristic.
5. The method of claim 3, wherein said determining whether said circuit breaker has a fault based on said degree of deviation and said degree of consistency and via a hierarchical decision mechanism comprises: if the deviation degree is lower than the corresponding dynamic deviation threshold value and all the consistency degrees are lower than the corresponding consistency threshold value, judging that the circuit breaker has no fault; If at least one deviation degree is not lower than a corresponding dynamic deviation threshold value or any consistency degree is not lower than a corresponding consistency threshold value, primarily judging that the breaker has faults, and entering a secondary fault confirmation stage; In the second-level fault confirmation stage, if all the consistency degrees are lower than the corresponding consistency threshold values and only one deviation degree is not lower than the corresponding dynamic deviation threshold value, judging that the circuit breaker has a single component abnormal fault; If the deviation degree is lower than the corresponding dynamic deviation threshold value and at least one consistency degree is not lower than the corresponding consistency threshold value, judging that the circuit breaker has signal abnormal faults; If at least one deviation degree is not lower than the corresponding dynamic deviation threshold value and all consistency degrees are lower than the corresponding consistency threshold value, judging that the composite component abnormal fault exists in the circuit breaker; and if at least one deviation degree is not lower than the corresponding dynamic deviation threshold value and at least one consistency degree is not lower than the corresponding consistency threshold value, judging that the circuit breaker has the abnormal fault of the combined characteristic.
6. The method of claim 1, wherein said time synchronizing said multi-source parameters to obtain time-aligned multi-source signal data comprises: Acquiring a current waveform of an operating coil according to the current of the operating coil, identifying a current starting abrupt change point from the current waveform, and taking the current starting abrupt change point as a reference time; Extracting a first peak point exceeding a preset acceleration threshold value from the vibration acceleration signal, taking the time corresponding to the peak point as first time, and taking the difference value between the first time and the reference time as a first delay amount of the vibration acceleration signal relative to the reference time; identifying a starting point of the movement of the moving contact from the moving contact displacement signal, taking the time corresponding to the starting point as second time, and taking the difference value between the second time and the reference time as a second delay amount of the displacement signal relative to the reference time; And taking the reference time as a time alignment reference point, compensating the vibration acceleration signal for the first time delay amount on a time axis, and compensating the moving contact displacement signal for the second time delay amount on the time axis to obtain time aligned multi-source signal data.
7. The method of claim 1, wherein said determining an environmental correction factor based on said environmental parameter comprises: According to the current temperature and humidity, carrying out two-dimensional linear interpolation in a preset environmental parameter reference mapping table to obtain a mechanical motion characteristic theoretical value under the current operation condition, wherein the environmental parameter reference mapping table uses the temperature as a row index and the humidity as a column index, and each element value represents the mechanical motion speed characteristic theoretical value of the healthy circuit breaker under the corresponding temperature and humidity conditions; Taking the ratio of the mechanical movement speed characteristic theoretical value to a standard mechanical movement speed characteristic value under a preset standard reference working condition as a working condition influence factor; Acquiring the total operation times of the circuit breaker from the operation of switching in; determining a mechanical transmission efficiency attenuation coefficient corresponding to the total operation times according to the mapping relation between the operation times and the attenuation coefficient; and multiplying the working condition influence factor by the mechanical transmission efficiency attenuation coefficient to obtain the environment correction factor.
8. An on-column circuit breaker failure analysis apparatus, comprising: The initial vector acquisition module is used for acquiring the multisource parameters of the circuit breaker and the environmental parameters monitored in real time, and carrying out time synchronization processing on the multisource parameters to acquire time-aligned multisource signal data; extracting a first initial feature vector and a second initial feature vector based on the multi-source signal data, wherein the multi-source parameters comprise operating coil current, main loop current, vibration acceleration and moving contact displacement, the environment parameters comprise temperature and humidity, the first initial feature vector comprises electromagnetic force feature values, mechanical movement speed feature values and mechanical impact feature values, and the second initial feature vector comprises current feature values; the environment correction factor determining module is used for determining an environment correction factor according to the environment parameters; The dynamic reference characteristic fingerprint determining module is used for determining a dynamic reference characteristic fingerprint according to the current characteristic value and the environment correction factor, wherein the dynamic reference characteristic fingerprint is used for representing the characteristic value which the healthy circuit breaker should represent under the current operation working condition; The deviation degree determining module is used for obtaining the deviation degree and the consistency degree according to the first initial feature vector and the dynamic reference feature fingerprint, wherein the deviation degree is used for representing the degree of deviation of each feature value from a health reference, and the consistency degree is used for representing the consistency degree of the physical relationship among the feature values; And the fault judging module is used for determining whether the breaker has faults or not through a hierarchical decision mechanism according to the deviation degree and the consistency degree.
9. An electronic device comprising a processor and a memory, the memory having stored therein a computer program that is loaded and executed by the processor to implement the on-column breaker failure analysis method of any of claims 1-7.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program, which is loaded and executed by a processor to implement the method of on-column breaker failure analysis of any of claims 1 to 7.

Description

Method and device for analyzing faults of pole-mounted circuit breaker Technical Field The application belongs to the technical field of distribution switch control equipment, and particularly relates to a method and a device for analyzing faults of a pole-mounted circuit breaker. Background In a power system, a circuit breaker is used as core protection equipment and bears key tasks such as fault current breaking, system isolation, operation mode switching and the like, and the reliability of the circuit breaker is directly related to safe and stable operation of a power grid. In the prior art, the state detection method of the circuit breaker is mainly based on single parameter or simple multi-parameter fusion. For example, the state of the device is determined by monitoring the change of a single physical quantity such as the current of the operating coil, the vibration acceleration signal, the displacement of the moving contact, etc., in combination with a preset threshold. Or the multi-source parameters (such as current, vibration and displacement) are simply overlapped or weighted, so that the overall performance of the circuit breaker is difficult to comprehensively evaluate, and the faults of the circuit breaker cannot be found in time. Disclosure of Invention The application provides a method and a device for analyzing faults of a pole-mounted circuit breaker, which are used for improving the fault detection speed and the fault detection precision of the circuit breaker. According to an aspect of an embodiment of the present application, there is provided a method for analyzing faults of a pole-mounted circuit breaker, including: The method comprises the steps of acquiring multisource parameters of a circuit breaker and environmental parameters monitored in real time, carrying out time synchronization processing on the multisource parameters to acquire multisource signal data aligned in time, extracting a first initial feature vector and a second initial feature vector based on the multisource signal data, wherein the multisource parameters comprise operating coil current, main loop current, vibration acceleration and moving contact displacement, the environmental parameters comprise temperature and humidity, the first initial feature vector comprises electromagnetic force feature values, mechanical movement speed feature values and mechanical impact feature values, and the second initial feature vector comprises current feature values; determining an environmental correction factor according to the environmental parameter; Determining a dynamic reference characteristic fingerprint according to the current characteristic value and the environment correction factor, wherein the dynamic reference characteristic fingerprint is used for representing the characteristic value which the healthy circuit breaker should represent under the current operation working condition; obtaining deviation degree and consistency degree according to the first initial feature vector and the dynamic reference feature fingerprint, wherein the deviation degree is used for representing the degree of each feature value deviating from the health standard, and the consistency degree is used for representing the consistency degree of the physical relationship between the feature values; and determining whether the breaker has faults or not through a hierarchical decision mechanism according to the deviation degree and the consistency degree. According to an aspect of an embodiment of the present application, there is provided an on-column breaker failure analysis apparatus including: The system comprises an initial vector acquisition module, a time alignment processing module and a time alignment processing module, wherein the initial vector acquisition module acquires multisource parameters of a circuit breaker and environmental parameters monitored in real time, and performs time synchronization processing on the multisource parameters to acquire multisource signal data aligned in time; The environment correction factor determining module is used for determining an environment correction factor according to the environment parameters; the dynamic reference characteristic fingerprint determining module is used for determining a dynamic reference characteristic fingerprint according to the characteristic information of the main loop current and the environment correction factor, wherein the dynamic reference characteristic fingerprint is used for representing a characteristic value which is required to be represented by the healthy circuit breaker under the current operation working condition; The deviation degree determining module is used for obtaining the deviation degree and the consistency degree according to the first initial feature vector and the dynamic reference feature fingerprint, wherein the deviation degree is used for representing the degree of each feature value deviating from the health standard, and the consist