CN-122017358-A - Multi-dimensional monitoring control fault diagnosis method for power and dragging loop integration

CN122017358ACN 122017358 ACN122017358 ACN 122017358ACN-122017358-A

Abstract

The invention belongs to the technical field of circuit protection, and in particular relates to a multi-dimensional monitoring control fault diagnosis method and system for integrating a power loop and a dragging loop, wherein the method comprises the steps of acquiring multi-dimensional physical variables of the power loop and the dragging loop through an intelligent controller and a power distribution monitoring terminal to construct a monitoring data set with synchronous time sequence; the method comprises the steps of obtaining a dynamic impedance characteristic sequence according to power side voltage, dragging side current and contact temperature, obtaining an impedance response residual sequence according to the dynamic impedance characteristic sequence and a standard impedance model, obtaining an electrical contact damage index and a mechanical load abnormality index according to the impedance response residual sequence and the contact temperature sequence, and diagnosing a fault source. According to the invention, by calculating dynamic impedance offset voltage fluctuation, subtracting the thermal effect through temperature correction and combining impedance residual error and temperature data, accurate classification and diagnosis of electrical contact damage and mechanical load abnormality are realized.

Inventors

CHEN WEINING
SU JIANBO
HAN XIONG
LIN PENG
HONG YONGSHENG
ZHANG MINGMING

Assignees

山西华控伟业科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260416

Claims (10)

1. The utility model provides a power and drag loop integrated multidimensional monitoring control fault diagnosis method which is characterized in that the method comprises the following steps: Acquiring a three-phase voltage module value of a power side, a three-phase current module value of a dragging side and a contact temperature, acquiring instantaneous apparent impedance according to the three-phase voltage module value of the power side and the three-phase current module value of the dragging side, and carrying out numerical correction on the instantaneous apparent impedance according to the difference between the contact temperature and an environment reference temperature and a rated temperature rise limit of the contact to obtain an instantaneous dynamic equivalent impedance value so as to construct a dynamic impedance characteristic sequence; Obtaining a standard impedance model sequence, calculating the absolute value of a difference value between a value in a dynamic impedance characteristic sequence and a corresponding value in the standard impedance model sequence, obtaining an instantaneous impedance residual value according to the absolute value of the difference value and a weighting coefficient which is gradually increased along with time to construct an impedance response residual sequence, obtaining the average value of the impedance response residual sequence, constructing a temperature rise sequence according to the difference value of each value in a contact temperature sequence relative to an environment reference temperature, and obtaining the average value of the temperature rise sequence; And diagnosing a fault source according to the electrical contact damage index and the mechanical load abnormality index.
2. The multi-dimensional monitoring control fault diagnosis method for integrating power and dragging loops according to claim 1 is characterized in that the method comprises the steps of collecting three-phase voltage module values of a power side, three-phase current module values of a dragging side and contact temperatures, collecting three-phase voltage sequences of the power loops through a power distribution monitoring terminal, collecting three-phase current sequences and contact temperature sequences of the dragging loops through an intelligent controller, recording control instructions in the control loops, conducting time stamp alignment on the three-phase voltage sequences, the three-phase current sequences and the contact temperature sequences through a network time synchronization protocol, intercepting data in a preset time period before and after the control instructions are sent out, and constructing a time sequence synchronous monitoring data set.
3. The method for diagnosing a power and drag loop integrated multidimensional monitoring and controlling fault as recited in claim 1, wherein the step of obtaining instantaneous apparent impedance according to the three-phase voltage module value of the power side and the three-phase current module value of the drag side comprises calculating a ratio of the three-phase voltage module value of the power side to the three-phase current module value of the drag side at each sampling time to obtain the instantaneous apparent impedance.
4. The method for diagnosing a power and drag loop integrated multidimensional monitoring control fault as recited in claim 1, wherein said instantaneous dynamic equivalent impedance value satisfies the relationship: ; In the formula, Is the first The calculated instantaneous dynamic equivalent impedance value at each sampling instant, Is the first The three-phase voltage values on the power side at each instant, Is the first The three-phase current mode value of the dragging side at each moment, Is the first The temperature of the contact at each moment in time, As a result of the ambient reference temperature, Is the rated temperature rise limit of the contact, Is a thermal correction coefficient.
5. The method of claim 1, wherein the step of obtaining the standard impedance model sequence includes identifying a current control command type and a load type, retrieving a standard impedance model sequence matched with the current control command type and the load type from a preset database, and aligning the dynamic impedance characteristic sequence with the standard impedance model sequence on a time axis.
6. The method for multi-dimensional monitoring and control fault diagnosis of power and drag loop integration according to claim 1, wherein the instantaneous impedance residual value satisfies the relation: ; In the formula, Is the first The instantaneous impedance residual values calculated at each moment, Is the first The calculated instantaneous dynamic equivalent impedance value at each sampling instant, Is the standard impedance model sequence in the first The preset value of the respective moment in time, Is a natural constant which is used for the production of the high-temperature-resistant ceramic material, Is a time weighting factor.
7. The method for multi-dimensional monitoring and control fault diagnosis of power and drag loop integration according to claim 1, wherein the electrical contact damage index satisfies the relationship: ; In the formula, In order to provide an index of the damage to the electrical contact, As the mean value of the impedance response residual sequence, As the average value of the temperature rise sequence, As a function of the index of the values, Is the temperature rise sensitivity coefficient.
8. The power and drag loop integrated multidimensional monitoring control fault diagnosis method as recited in claim 1, wherein the mechanical load abnormality index satisfies the relationship: ; In the formula, As an index of the abnormality of the mechanical load, Is the mean value of the sequence of standard impedance models, As a function of taking only a positive value, As the mean value of the dynamic impedance feature sequence, Is the mean value of the temperature rise sequence.
9. The method for diagnosing a power and drag loop integrated multidimensional monitoring control fault according to claim 1, wherein the fault source diagnosis is performed according to the electrical contact damage index and the mechanical load abnormality index, and the method comprises the steps of immediately sending a brake-separating instruction to an intelligent controller and cutting off a power supply in response to the electrical contact damage index being greater than or equal to an electrical alarm threshold.
10. A power and drag loop integrated multidimensional monitoring control fault diagnosis system comprising a processor and a memory, the memory storing computer program instructions which when executed by the processor implement a power and drag loop integrated multidimensional monitoring control fault diagnosis method according to any of claims 1-9.

Description

Multi-dimensional monitoring control fault diagnosis method for power and dragging loop integration Technical Field The invention relates to the technical field of circuit protection. More particularly, the invention relates to a power and drag loop integrated multidimensional monitoring control fault diagnosis method. Background The power and dragging loop is used as a core energy transmission and control unit of industrial production equipment, and the running stability of the power and dragging loop is directly related to the continuity and safety of a production line. In the fields of petroleum, chemical industry, coal mine and various automatic manufacturing, the motor and a power distribution system thereof are in a high-load and continuous running state for a long time, and faults such as poor contact, insulation aging or mechanical clamping stagnation are extremely easy to occur. If the faults can not be found timely and accurately diagnosed, the equipment is stopped and production is interrupted if the faults are light, and electrical fire or serious mechanical damage accidents are caused if the faults are heavy, so that the real-time monitoring and fault diagnosis of the power and dragging loop are particularly important for industrial safety production. In the related art, a method based on electrical quantity threshold judgment is generally adopted to monitor a loop. The method generally obtains voltage and current signals of a loop through a collecting device arranged in a power distribution cabinet or a control box, and calculates a current effective value or a base impedance value. When the monitored current exceeds a certain multiple of the rated current or the calculated impedance value deviates from the set range, the system judges that overload, short circuit or abnormality exists in the loop and triggers alarming or tripping action, so that the basic protection of the motor and the circuit is realized. However, in the related art, the judgment is mainly performed by relying on a single electrical quantity threshold value, but the nonlinear interference of complex working conditions and environmental factors on the industrial field on the monitoring data is ignored. Firstly, the power distribution side and the dragging control side are separated in normal physical positions, the data acquired independently of each other lack of a uniform time reference and are directly compared to easily cause analysis errors, secondly, the traditional method does not consider the voltage fluctuation of a power grid and the resistivity drift of a conductor caused by temperature rise, and easily misjudges normal voltage change or thermal effect as equipment faults to cause high false alarm rate, so that the monitoring and diagnosis of a power and dragging loop in the prior art have certain limitations. Disclosure of Invention In order to solve the technical problems that data time sequence dislocation exists in the power and dragging loop monitoring, misinformation is easily caused by voltage fluctuation and temperature rise interference, and electrical contact faults and mechanical load faults are difficult to distinguish, the invention provides a multi-dimensional monitoring control fault diagnosis method for integrating the power and dragging loop, which comprises the steps of collecting three-phase voltage module values of a power side, three-phase current module values of a dragging side and contact temperatures; the method comprises the steps of obtaining instantaneous apparent impedance according to a three-phase voltage module value of a power side and a three-phase current module value of a dragging side, carrying out numerical correction on the instantaneous apparent impedance according to the difference between a contact temperature and an environment reference temperature and a rated temperature rise limit of the contact to obtain an instantaneous dynamic equivalent impedance value so as to construct a dynamic impedance characteristic sequence, obtaining a standard impedance model sequence, calculating an absolute value of a difference value between a value in the dynamic impedance characteristic sequence and a corresponding value in the standard impedance model sequence, obtaining an instantaneous impedance residual value according to the absolute value of the difference value and a weighting coefficient which gradually increases along with time so as to construct an impedance response residual sequence, obtaining an average value of the impedance response residual sequence, constructing a temperature rise sequence according to the difference value of each value in the contact temperature sequence relative to the environment reference temperature, obtaining an average value of the temperature rise sequence, obtaining an electrical contact damage index according to the average value of the impedance response residual sequence and the average value of the temperature rise sequence, obtaining a m