CN-117109892-B - Mechanical state monitoring method and system for spring operating mechanism of GIS (gas insulated switchgear) breaker

CN117109892BCN 117109892 BCN117109892 BCN 117109892BCN-117109892-B

Abstract

The invention discloses a method and a system for monitoring mechanical state of a spring mechanism of a GIS breaker. The method comprises the steps of collecting vibration signals in a switching-on and switching-off process of a GIS breaker, calculating frequency spectrums of the vibration signals, obtaining a plurality of modal components of the vibration signals based on variation modal decomposition, identifying a multi-peak modal component in the plurality of modal components of the vibration signals based on a local extremum method, determining a frequency band division boundary of the multi-peak modal component, designing a filter according to a frequency band division result, obtaining corresponding single-peak modal components, calculating center frequencies of all the single-peak modal components, calculating correlation coefficients of a center frequency sequence and a historical vibration signal center frequency sequence of the spring operation mechanism of the GIS breaker, and judging the mechanical state of the spring operation mechanism of the GIS breaker according to the correlation coefficients. The invention can efficiently and accurately judge the mechanical state of the spring operating mechanism of the GIS breaker, thereby timely taking effective operation and maintenance measures of the GIS breaker and avoiding large faults.

Inventors

WANG SHAOHE
CHEN XIAOXIN
ZHAO LIN
LI CHEN
HAN RUI
WANG FENGHUA
ZHANG MIAOBIN

Assignees

国网浙江省电力有限公司电力科学研究院

Dates

Publication Date: 20260508
Application Date: 20230808

Claims (10)

The mechanical state monitoring method of the spring operating mechanism of the GIS breaker is characterized by comprising the following steps: Step 1, collecting vibration signals in the switching-on and switching-off process of a GIS breaker ; Step2, calculating vibration signals based on Fourier transformation Is a frequency spectrum of (2); step 3, performing variation modal decomposition according to the frequency spectrum of the vibration signal to obtain a plurality of modal components of the vibration signal; Step 4, identifying a multi-peak modal component in a plurality of modal components of the vibration signal based on a local extremum method and determining a frequency band segmentation boundary; Step 5, designing a filter according to the frequency band segmentation result of the multi-peak modal component of the vibration signal to obtain a corresponding single-peak modal component; step 6, calculating the center frequencies of all the single-peak modal components of the vibration signals of the GIS breaker spring operating mechanism obtained through decomposition; and 7, calculating a correlation coefficient between the current vibration signal center frequency sequence and the GIS breaker spring operating mechanism historical vibration signal center frequency sequence, and judging the mechanical state of the GIS breaker spring operating mechanism according to the correlation coefficient.
2. The method for monitoring mechanical state of spring operator of GIS circuit breaker according to claim 1, wherein in step 1, the vibration signal is obtained by a vibration acceleration sensor placed on a casing of the spring operator of GIS circuit breaker, and the sampling frequency is The sampling point length is 。
3. The method for monitoring the mechanical state of the spring operating mechanism of the GIS breaker according to claim 1, wherein the specific process of the step 3 is as follows: 3a, constructing a constraint variation model of a vibration signal of the GIS breaker, wherein the constraint variation model is expressed as: Wherein: representing a kth modal component in the vibration signal based on the variation modal decomposition; Representing the number of modal components; Representing a pulse function; representing the kth modal component And the center frequency of (2) satisfy both ; Representing a 2-norm; The partial derivative of t is indicated, Representing the frequency; 3b, converting the constrained variational model into an unconstrained optimization variational model through an augmented Lagrangian function, wherein the unconstrained optimization variational model is expressed as: Wherein: is a secondary penalty factor; Is Lagrange multiplier parameter; Represents the inner product operation of x and y; 3c, setting a secondary penalty factor Number of modal components Convergence tolerance Let iteration variable 、、 And Here, n represents the number of iterations; And 3d, calculating an optimal solution of the unconstrained optimization variation model by adopting an alternate direction multiplier method.
4. The method for monitoring mechanical states of a spring operation mechanism of a GIS circuit breaker according to claim 3, wherein the method for calculating the optimal solution of the unconstrained optimization variation model by using the alternate direction multiplier method comprises the following calculation steps: 31 To respectively pair And Performing Fourier transform, and respectively marking corresponding Fourier transform results as And ; 32 According to the following Updating modal components The modal component calculation formula is as follows: 33 According to the following Updating center frequency The center frequency calculation formula is as follows: 34 According to the following Updating Lagrange multipliers Here, the number of the parts of the device, here, Updating the step length; 35 Judging whether or not the stop condition is satisfied If not, make Repeating the steps 31-35 until the optimal solution of the unconstrained optimization variation model is obtained, namely Each modal component IMF 1 、IMF 2 , 、IMF P 。
5. The method for monitoring the mechanical state of the spring operating mechanism of the GIS breaker according to claim 1, wherein the specific process of the step 4 is as follows: 4a, for each one in turn modal component IMF 1 、IMF 2 , Performing Fourier transform on IMF P to obtain frequency spectrum, which is recorded as ; 4B, traversing the whole spectrum sequence, and adding sequence elements which are simultaneously larger than the previous element and the next element into the array { as local maxima of the spectrum curve In }; 4c { array } The elements in the sequence are arranged in descending order, and the largest spectrum sequence element is extracted Elements ordered as the L-th element ; 4D. According to the L-th element Array { before ordering in descending order Correction is made, reserve greater than or equal to Is recorded and recorded in turn as 、、、、、 Here, the number of the parts to be processed is, Representing the magnitude of the first local maxima of the modal component IMF k , ; 4E, setting a multimodal judgment threshold coefficient Will be Sequentially with Comparing if there is only one local maximum to satisfy Then it is determined that the spectrum of the modal component IMF k is in a unimodal form, considered to be decomposed, denoted IMF k.0 , and the number of such modal components is set to Otherwise, the spectrum of the modal component IMF k is a multimodal function; 4f. note that the modal component IMF k satisfies The frequency of the local maxima of (a) is sequentially recorded as 、、、 I.e. the band split boundary.
6. The method of monitoring mechanical state of a spring operator of a GIS circuit breaker according to claim 4, wherein in step 5, the first step is The calculation of the individual multimodal components is as follows: 5a, determining the boundary of frequency band division, namely taking the intermediate value of the frequencies corresponding to two continuous maxima as the boundary of frequency spectrum division The corresponding calculation formula is: Wherein: And Is the boundary of two sides of the body; whereby the whole band is divided into m+1 sub-bands, the different sub-band ranges are noted: Here, the number of the parts of the device, here, And ; 5B, by Is defined as the center and the width is Is provided, here, ; 5C, introducing a scale function Construction Band pass filter of the upper band pass filter, other band ranges The upper band-pass filter is composed of an empirical wavelet function It is determined that the number of the cells, Said scale function And empirical wavelet function The formula of (2) is: Wherein: Is arbitrary Equation, taken as: ; 5d. Scaling the scale function And empirical wavelet function Respectively with the frequency spectrum signal Band filtering is performed based on inner product operation to obtain approximation coefficients And detail coefficient It is expressed as: Wherein: And Respectively are And Fourier transform of (a); representation fetch Complex conjugate functions of (a); Representing an inverse fourier transform; Time is; Representation of Translation on the time axis; Representation of Translation on the time axis; 5e, obtaining single component components of the multi-modal component IMF k according to the approximation coefficient and the detail coefficient According to The frequencies are arranged from low to high and are sequentially marked as IMF k.1 、IMF k.2 , The IMF k.(M+1) , the calculation formula of the single component is: 。
7. The method for monitoring mechanical state of spring operation mechanism of GIS circuit breaker according to claim 1, wherein in step 6, the center frequency is calculated by fourier transform, and the number is , The number of frequencies is represented, and P represents the number of modal components.
A GIS breaker spring operator mechanical condition monitoring system, characterized in that it is adapted to implement a GIS breaker spring operator mechanical condition monitoring method according to any one of claims 1-7.
9. An electronic device comprising a processor, a storage medium and a computer program stored in the storage medium, characterized in that the computer program, when executed by the processor, implements the GIS circuit breaker spring operator mechanical state monitoring method of any one of claims 1 to 7.
10. A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the GIS circuit breaker spring operator mechanical condition monitoring method of any one of claims 1 to 7.

Description

Mechanical state monitoring method and system for spring operating mechanism of GIS (gas insulated switchgear) breaker Technical Field The invention relates to the technical field of mechanical state monitoring of a GIS breaker operating mechanism, in particular to a method, a system, equipment and a medium for monitoring the mechanical state of a spring operating mechanism in the switching-on and switching-off process of a GIS breaker. Background The gas-insulated switchgear (GAS Insulated Switchgear, GIS) is a closed combined electrical apparatus composed of electrical equipment such as a breaker, a disconnecting switch, a grounding switch, a transformer, a lightning arrester, a bus and the like, has the advantages of small occupied space, high insulation level, small overhaul and maintenance workload, low failure occurrence rate and the like, and is widely applied to substations with different voltage levels. As an on-off element with an arc extinguishing function in the GIS, the circuit breaker bears normal working current and cuts off fault current, has dual functions of protection and control, and is one of core components for guaranteeing the safe and stable operation of the GIS. When the circuit breaker acts, the operating mechanism provides energy, so that good operation of the operating mechanism is an important premise for realizing the opening and closing operation of the circuit breaker. The spring operating mechanism has the advantages of simple structure, small volume, low operating noise, no environmental pollution, no operation and maintenance, high reliability and the like, and becomes one of the most widely applied operating mechanism types in the high-voltage circuit breaker. However, the complicated mechanical structure of the spring operating mechanism of the circuit breaker causes more fault types, and the fault types are mainly represented by refusal of operation, incomplete opening and closing, incorrect opening and closing, and the like. It is counted that mechanical faults are the main faults of the circuit breaker, and the fault ratio caused by the operating mechanism is the highest and rises year by year. Therefore, how to accurately identify the mechanical defects of the spring operating mechanism of the GIS breaker has been a focus. The vibration signal acts as an effective carrier of the mechanical state information of the device, the change of which is closely related to the change of the operating state of the device. As a kind of instantaneous switching equipment, the motion of the mechanical element of the operating mechanism in the switching-on and switching-off process of the GIS breaker, the impact of the contact, etc. can generate vibration signals, namely the internal event in the switching-on and switching-off action process of the GIS breaker is represented in each transient waveform, so that the multimodal vibration signals in the switching-on and switching-off process of the GIS breaker bear the action information of each mechanical element in the GIS breaker and have strong similarity, so that the vibration analysis method has become an important means for monitoring the mechanical state of the breaker. However, corresponding to the movement process of a mechanical element in the switching-on and switching-off process of the GIS breaker, the associated vibration signal has the characteristics of rapid rising, gradual attenuation and multimodal aliasing, and the corresponding frequency spectrum has wide-frequency continuous distribution, so that difficulty is brought to accurately acquiring the mechanical state information of equipment contained in the vibration signal. Disclosure of Invention The invention aims to provide a mechanical state monitoring method of a GIS breaker spring operating mechanism, which is used for calculating and analyzing the change of the center frequency of a plurality of modal components in a vibration signal by monitoring the vibration signal of the GIS breaker spring operating mechanism so as to realize the efficient and accurate judgment of the mechanical state of the GIS breaker spring operating mechanism. In order to achieve the aim of the invention, the invention provides a mechanical state monitoring method of a spring operating mechanism of a GIS breaker, which comprises the following steps: Step 1, collecting vibration signals s (t) in the switching-on and switching-off process of a GIS breaker; step2, calculating a frequency spectrum of a vibration signal s (t) based on Fourier transformation, wherein the frequency spectrum of the vibration signal is expressed as s (omega); step 3, performing variation modal decomposition according to the frequency spectrum of the vibration signal to obtain a plurality of modal components of the vibration signal; Step 4, identifying a multi-peak modal component in a plurality of modal components of the vibration signal based on a local extremum method and determining a frequency band segmenta