CN113341306A - High-voltage circuit breaker state evaluation system and method based on vibration signals - Google Patents
High-voltage circuit breaker state evaluation system and method based on vibration signals Download PDFInfo
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Abstract
The invention relates to a vibration signal-based high-voltage circuit breaker state evaluation system and method, and belongs to the technical field of high-voltage circuit breaker state evaluation. The method comprises the steps of collecting vibration signals of the high-voltage circuit breaker, denoising and drawing a time domain waveform curve through two piezoelectric acceleration sensors arranged on the surface of the high-voltage circuit breaker; then analyzing the drawn waveform curve to obtain waveform characteristic parameters, wherein the characteristic parameters respectively comprise: energy characterization parameter, energy entropy、Time domain peak value size parameter, time domain peak value number parameter and frequency center; and after the characteristic parameters are obtained, calculating a state evaluation parameter and a reference parameter of the high-voltage circuit breaker, and finally calculating a state evaluation coefficient to evaluate the state of the high-voltage circuit breaker. The method effectively improves the accuracy of the state evaluation of the high-voltage circuit breaker, and is easy to popularize and apply.
Description
Technical Field
The invention belongs to the technical field of high-voltage circuit breaker state evaluation, and particularly relates to a vibration signal-based high-voltage circuit breaker state evaluation system and method.
Background
The high-voltage circuit breaker is an important electrical control device in a power system, has perfect arc extinguishing function and strong current breaking capacity, can cut off load current, can also be matched with relay protection to cut off short-circuit current when the power system breaks down, and has important significance for ensuring the safe and stable operation of the power system in terms of operation reliability. According to the current situation and accident statistics of domestic distribution switchgear, the mechanical fault of the high-voltage circuit breaker accounts for about 37% of the fault of the circuit breaker, and the mechanical fault of the high-voltage circuit breaker is an important factor influencing the safe and stable operation of electrical equipment.
The high-voltage circuit breaker can produce a large amount of vibration signals at the divide-shut brake in-process, and the high-voltage circuit breaker state evaluation according to vibration signals often ignores the influence of frequency to the characteristic parameter at present, does same processing and contrast to the different vibration signals of several contained frequency channels not considering the frequency influence, and the existence contains the different state evaluation parameter errors that cause of frequency channel, and the circuit breaker vibration signal collection system who adopts single sensor does not consider because the evaluation parameter error that brings of vibration point and drive disk assembly position difference. Therefore, a system and a method for evaluating the state of a high-voltage circuit breaker based on a vibration signal are urgently needed to solve the problem of state evaluation parameter errors caused by different frequencies and vibration point positions.
Disclosure of Invention
The invention provides a vibration signal-based high-voltage circuit breaker state evaluation system and method, aiming at overcoming the defects that vibration signals with different frequencies can cause errors on the state evaluation parameters of a high-voltage circuit breaker, vibration points and position differences of transmission parts can also affect the state evaluation parameters.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a vibration signal based high voltage circuit breaker condition evaluation system comprising:
the device comprises a piezoelectric acceleration sensor, a preamplifier, a data collector and a terminal;
the piezoelectric acceleration sensor comprises a first piezoelectric acceleration sensor and a second piezoelectric acceleration sensor;
the first piezoelectric acceleration sensor and the second piezoelectric acceleration sensor are respectively arranged on a switching-off component box and a transmission component box of the high-voltage circuit breaker, vibration signals of the high-voltage circuit breaker, which are acquired by the first piezoelectric acceleration sensor and the second piezoelectric acceleration sensor, are amplified by a preamplifier and then input into a data acquisition unit, and the data acquisition unit inputs the signals into a terminal machine for processing.
The invention also provides a vibration signal-based high-voltage circuit breaker state evaluation method, and the vibration signal-based high-voltage circuit breaker state evaluation system comprises the following steps:
the method comprises the following steps of firstly, obtaining a vibration signal of the high-voltage circuit breaker, denoising and drawing a curve:
obtaining vibration signals of the high-voltage circuit breaker through the first piezoelectric acceleration sensor and the second piezoelectric acceleration sensor, denoising the obtained vibration signals, and drawing the vibration signals at different frequencies fiTime domain waveform curve of
Secondly, calculating the characteristic parameters of the vibration signals:
calculating a time domain waveform curve
Energy characterizing parameters of
Unit is V2S; energy entropy Hf(ii) a Time domain peak size parameter
The unit is V; time domain peak number parameter
Center of frequency fcIn Hz;
energy characterizing parameters
The formula (2) is calculated as,
in the formula, t1Is a wave curve
The starting time of (2) in seconds; t is t2Calculating the termination time of the energy characterization parameters in seconds;
normalizing energy characterization parameters by using a calculation formula,
in the formula (f)iRepresents the ith frequency in Hz;
energy entropy HfThe formula (2) is calculated as,
the time domain peak size parameter
Is calculated byThe formula is as follows,
in the formula (I), the compound is shown in the specification,
is a frequency fiT on the time domain curve of the time signal1～t2The size of n peak values in the time domain is V, and the number of the time domain peak values is a parameter
Is at a frequency fiTime domain curve of (d) at t1～t2The number of internal peaks;
center of frequency fcThe formula (2) is calculated as,
in the formula (I), the compound is shown in the specification,
the time domain peak value size parameter under the ith frequency is represented by the unit V;
the third step: repeating the first step to the second step to obtain a plurality of groups of brand new high-voltage circuit breakers in total when the high-voltage circuit breakers are normally switched on and off
Hf、
fcEach characteristic parameter is used as a benchmark;
fourthly, calculating a state evaluation parameter C and a reference parameter D of the high-voltage circuit breakerkAnd averaging multiple groups of reference parameters to obtain an average value Davg：
The high-voltage circuit breaker state evaluation parameter is calculated by the following formula,
wherein C is an evaluation parameter of the high-voltage circuit breaker in actual operation,
Hf0、
fctime domain peak value number parameters, energy entropy, time domain peak value size parameters and frequency centers of the high-voltage circuit breaker in actual operation are respectively;
the calculation formula of the reference parameter of the high-voltage circuit breaker is as follows,
in the formula, DkIs a reference parameter of the kth brand-new circuit breaker,
Hf、
fcrespectively is a time domain peak value number parameter, an energy entropy, a time domain peak value size parameter and a frequency center of the brand-new circuit breaker;
sixthly, calculating a high-voltage circuit breaker state evaluation coefficient M, and then evaluating the state of the high-voltage circuit breaker:
the high-voltage circuit breaker state evaluation coefficient M is,
and evaluating the state of the high-voltage circuit breaker according to the state evaluation coefficient, wherein the evaluation coefficient value is larger for the high-voltage circuit breaker with worse state.
Further, it is preferable that, in the first step, the acquired vibration signal is denoised by a wavelet denoising method.
Further, it is preferable that, in the second step, t2Value 20 seconds, t1The value is 0.
Further, preferably, in the third step, the plurality of groups is 5 groups; in the fourth step, 5 groups of reference parameters are averaged to obtain a value DavgThe formula is as follows,
in the formula, k is the number of brand new circuit breakers.
The value of i in the invention depends on the number of frequencies of the vibration signal obtained by actual measurement.
The invention extracts the characteristic parameters of the brand-new high-voltage circuit breaker during normal on-off so as to take the characteristic parameters as reference quantities for subsequently judging the state of the actual operation circuit breaker.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a vibration signal-based high-voltage circuit breaker state evaluation system and method. At present, the influence of frequency on characteristic parameters is often ignored in the state evaluation of the high-voltage circuit breaker according to vibration signals, the influence of the frequency is not considered, the same processing and comparison are carried out on several vibration signals with different frequency bands, state evaluation parameter errors caused by the different frequency bands exist, and the error of the evaluation parameters caused by the position difference of a vibration point and a transmission part is not considered in the circuit breaker vibration signal acquisition system adopting a single sensor. The piezoelectric acceleration sensors are arranged on the on-off element box and the transmission element box, the influence of the position difference of the vibration point and the transmission part on the state evaluation parameter is considered, and the accuracy of the state evaluation of the high-voltage circuit breaker is effectively improved.
Drawings
FIG. 1 is a flow chart of a system and method for vibration signal based evaluation of the condition of a high voltage circuit breaker according to the present invention;
FIG. 2 is a vibration signal based high voltage circuit breaker condition evaluation system of the present invention;
wherein, 1, an operating mechanism; 2. a transmission element case; 3. opening and closing the component box; 4. an insulating support member; 4a, a first insulating support element; 4b, a second insulating support element; 5. a base; 6. a piezoelectric acceleration sensor; 6a, a first piezoelectric acceleration sensor; 6b, a second piezoelectric acceleration sensor; 7. a preamplifier; 8. a data acquisition unit; 9. a terminal machine; 10. a high voltage circuit breaker;
FIG. 3 is a vibration signal of a high-voltage circuit breaker collected when 5 brand-new circuit breakers are opened and closed;
FIG. 4 is a vibration signal collected during operation of a high voltage circuit breaker and opening of a fault circuit breaker; wherein, (a) is the vibration signal that the high voltage circuit breaker gathered in operation, (b) is the vibration signal that a trouble circuit breaker gathered when breaking.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The materials or equipment used are not indicated by manufacturers, and all are conventional products available by purchase.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, "connected" as used herein may include wirelessly connected. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, "a plurality" means two or more unless otherwise specified. The terms "inner," "upper," "lower," and the like, refer to an orientation or a state relationship based on that shown in the drawings, which is for convenience in describing and simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "provided" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention are understood according to specific situations.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Example 1
As shown in fig. 2, a vibration signal-based state evaluation system for a high voltage circuit breaker includes:
the device comprises a piezoelectric acceleration sensor 6, a preamplifier 7, a data collector 8 and a terminal 9;
the piezoelectric acceleration sensor 6 includes a first piezoelectric acceleration sensor 6a, a second piezoelectric acceleration sensor 6 b;
the first piezoelectric acceleration sensor 6a and the second piezoelectric acceleration sensor 6b are respectively installed on the on-off component box 3 and the transmission component box 2 of the high-voltage circuit breaker 10, vibration signals of the high-voltage circuit breaker 10 collected by the first piezoelectric acceleration sensor 6a and the second piezoelectric acceleration sensor 6b are amplified by the preamplifier 7 and then input into the data collector 8, and the data collector 8 inputs the signals into the terminal 9 for processing.
Example 2
A high-voltage circuit breaker state evaluation method based on vibration signals adopts the high-voltage circuit breaker state evaluation system based on the vibration signals, and comprises the following steps:
the method comprises the following steps of firstly, obtaining a vibration signal of the high-voltage circuit breaker, denoising and drawing a curve:
obtaining vibration signals of the high-voltage circuit breaker through the first piezoelectric acceleration sensor and the second piezoelectric acceleration sensor, denoising the obtained vibration signals, and drawing the vibration signals at different frequencies fiTime domain waveform curve of
Secondly, calculating the characteristic parameters of the vibration signals:
calculating a time domain waveform curve
Energy characterizing parameters of
Unit is V2S; energy entropy Hf(ii) a Time domain peak size parameter
The unit is V; time domain peak number parameter
Center of frequency fcIn Hz;
energy characterizing parameters
The formula (2) is calculated as,
in the formula, t1Is a wave curve
The starting time of (2) in seconds; t is t2Calculating the termination time of the energy characterization parameters in seconds;
normalizing energy characterization parameters by using a calculation formula,
in the formula (f)iRepresents the ith frequency in Hz;
energy entropy HfThe formula (2) is calculated as,
the time domain peak size parameter
The formula (2) is calculated as,
in the formula (I), the compound is shown in the specification,
is a frequency fiT on the time domain curve of the time signal1～t2The size of N peak values in the time domain is V, and the parameter N of the number of time domain peak valuesfi0Is at a frequency fiTime domain curve of (d) at t1～t2The number of internal peaks;
center of frequency fcThe formula (2) is calculated as,
in the formula (I), the compound is shown in the specification,
the time domain peak value size parameter under the ith frequency is represented by the unit V;
the third step: repeating the first step to the second step to obtain a plurality of groups of brand new high-voltage circuit breakers in total when the high-voltage circuit breakers are normally switched on and off
Hf、
fcEach characteristic parameter is used as a benchmark;
fourthly, calculating a state evaluation parameter C and a reference parameter D of the high-voltage circuit breakerkAnd averaging multiple groups of reference parameters to obtain an average value Davg：
The high-voltage circuit breaker state evaluation parameter is calculated by the following formula,
wherein C is an evaluation parameter of the high-voltage circuit breaker in actual operation,
Hf0、
fctime domain peak value number parameters, energy entropy, time domain peak value size parameters and frequency centers of the high-voltage circuit breaker in actual operation are respectively;
the calculation formula of the reference parameter of the high-voltage circuit breaker is as follows,
in the formula, DkIs a reference parameter of the kth brand-new circuit breaker,
Hf、
fcrespectively is a time domain peak value number parameter, an energy entropy, a time domain peak value size parameter and a frequency center of the brand-new circuit breaker;
sixthly, calculating a high-voltage circuit breaker state evaluation coefficient M, and then evaluating the state of the high-voltage circuit breaker:
the high-voltage circuit breaker state evaluation coefficient M is,
and evaluating the state of the high-voltage circuit breaker according to the state evaluation coefficient, wherein the evaluation coefficient value is larger for the high-voltage circuit breaker with worse state.
Example 3
A high-voltage circuit breaker state evaluation method based on vibration signals adopts the high-voltage circuit breaker state evaluation system based on the vibration signals, and comprises the following steps:
the method comprises the following steps of firstly, obtaining a vibration signal of the high-voltage circuit breaker, denoising and drawing a curve:
obtaining vibration signals of the high-voltage circuit breaker through the first piezoelectric acceleration sensor and the second piezoelectric acceleration sensor, denoising the obtained vibration signals, and drawing the vibration signals at different frequencies fiTime domain waveform curve of
Secondly, calculating the characteristic parameters of the vibration signals:
calculating a time domain waveform curve
Energy characterizing parameters of
Unit is V2S; energy entropy Hf(ii) a Time domain peak size parameter
The unit is V; time domain peak number parameter
Center of frequency fcIn Hz;
energy characterizing parameters
The formula (2) is calculated as,
in the formula, t1Is a wave curve
The starting time of (2) in seconds; t is t2Calculating the termination time of the energy characterization parameters in seconds;
normalizing energy characterization parameters by using a calculation formula,
in the formula (f)iRepresents the ith frequency in Hz;
energy entropy HfThe formula (2) is calculated as,
the time domain peak size parameter
The formula (2) is calculated as,
in the formula (I), the compound is shown in the specification,
is a frequency fiT on the time domain curve of the time signal1～t2The size of n peak values in the time domain is V, and the number of the time domain peak values is a parameter
Is at a frequency fiTime domain curve of (d) at t1～t2The number of internal peaks;
center of frequency fcThe formula (2) is calculated as,
in the formula (I), the compound is shown in the specification,
the time domain peak value size parameter under the ith frequency is represented by the unit V;
the third step: repeating the first step to the second step to obtain a plurality of groups of brand new high-voltage circuit breakers in total when the high-voltage circuit breakers are normally switched on and off
Hf、
fcEach characteristic parameter is used as a benchmark;
the fourth step, calculate the high pressure breakRoad-path-unit state evaluation parameter C and reference parameter DkAnd averaging multiple groups of reference parameters to obtain an average value Davg：
The high-voltage circuit breaker state evaluation parameter is calculated by the following formula,
wherein C is an evaluation parameter of the high-voltage circuit breaker in actual operation,
Hf0、
fctime domain peak value number parameters, energy entropy, time domain peak value size parameters and frequency centers of the high-voltage circuit breaker in actual operation are respectively;
the calculation formula of the reference parameter of the high-voltage circuit breaker is as follows,
in the formula, DkIs a reference parameter of the kth brand-new circuit breaker,
Hf、
fcrespectively is a time domain peak value number parameter, an energy entropy, a time domain peak value size parameter and a frequency center of the brand-new circuit breaker;
sixthly, calculating a high-voltage circuit breaker state evaluation coefficient M, and then evaluating the state of the high-voltage circuit breaker:
the high-voltage circuit breaker state evaluation coefficient M is,
and evaluating the state of the high-voltage circuit breaker according to the state evaluation coefficient, wherein the evaluation coefficient value is larger for the high-voltage circuit breaker with worse state.
In the first step, the acquired vibration signal is denoised by a wavelet denoising method.
In the second step, t2Value 20 seconds, t1The value is 0.
In the third step, the multiple groups are 5 groups; in the fourth step, 5 groups of reference parameters are averaged to obtain a value DavgThe formula is as follows,
in the formula, k is the number of brand new circuit breakers.
Examples of the applications
As shown in fig. 2, a vibration signal-based state evaluation system for a high voltage circuit breaker includes:
the device comprises a piezoelectric acceleration sensor 6, a preamplifier 7, a data collector 8 and a terminal 9;
the piezoelectric acceleration sensor 6 includes a first piezoelectric acceleration sensor 6a, a second piezoelectric acceleration sensor 6 b;
the first piezoelectric acceleration sensor 6a and the second piezoelectric acceleration sensor 6b are respectively installed on the on-off component box 3 and the transmission component box 2 of the high-voltage circuit breaker 10, vibration signals of the high-voltage circuit breaker 10 collected by the first piezoelectric acceleration sensor 6a and the second piezoelectric acceleration sensor 6b are amplified by the preamplifier 7 and then input into the data collector 8, and the data collector 8 inputs the signals into the terminal 9 for processing.
The high-voltage circuit breaker 10 is of an existing structure, and the high-voltage circuit breaker 10 comprises an operating mechanism 1, a transmission element box 2, a switching element box 3, an insulating support element 4 and a base 5; the insulating support member 4 includes a first insulating support member 4a, a second insulating support member 4 b;
the transmission element box 2 is arranged on a base 5 through a first insulating support element 4a and a second insulating support element 4b which are symmetrically arranged; the operating mechanism 1 is connected with the transmission element box 2; the transmission element case 2 is connected to the breaking element case 3.
As shown in fig. 1, a method for evaluating a state of a high-voltage circuit breaker based on a vibration signal, which adopts the system for evaluating a state of a high-voltage circuit breaker based on a vibration signal, includes the following steps:
the method comprises the following steps of firstly, obtaining a vibration signal of the high-voltage circuit breaker, denoising and drawing a curve:
obtaining vibration signals of the high-voltage circuit breaker through the first piezoelectric acceleration sensor and the second piezoelectric acceleration sensor, denoising the obtained vibration signals by using a wavelet denoising method, and drawing the vibration signals at different frequencies fiTime domain waveform curve of
Secondly, calculating the characteristic parameters of the vibration signals:
calculating a time domain waveform curve
Energy characterizing parameters of
Unit is V2S; energy entropy Hf(ii) a Time domain peak size parameter
The unit is V; time domain peak number parameter
Center of frequency fcIn Hz;
energy characterizing parameters
The formula (2) is calculated as,
in the formula, t1Is a wave curve
The starting time of (2) in seconds; t is t2The terminating time of the energy characterization parameter calculation is 20 in seconds;
normalizing energy characterization parameters by using a calculation formula,
in the formula (f)iRepresents the ith frequency in Hz;
energy entropy HfThe formula (2) is calculated as,
the time domain peak size parameter
The formula (2) is calculated as,
in the formula (I), the compound is shown in the specification,
is a frequency fiT on the time domain curve of the time signal1～t2The size of n peak values in the time domain is V, and the number of the time domain peak values is a parameter
Is at a frequency fiTime domain curve of (d) at t1～t2The number of internal peaks;
center of frequency fcThe formula (2) is calculated as,
in the formula (I), the compound is shown in the specification,
the time domain peak value size parameter under the ith frequency is represented by the unit V;
the third step: repeating the first step to the second step to obtain 5 groups of brand-new high-voltage circuit breakers in total when the high-voltage circuit breakers are normally switched on and off
Hf、
fcEach characteristic parameter is used as a benchmark;
fourthly, calculating a state evaluation parameter C and a reference parameter D of the high-voltage circuit breakerkAnd averaging multiple groups of reference parameters to obtain an average value Davg：
The high-voltage circuit breaker state evaluation parameter is calculated by the following formula,
wherein C is an evaluation parameter of the high-voltage circuit breaker in actual operation,
Hf0、
fctime domain peak value number parameters, energy entropy, time domain peak value size parameters and frequency centers of the high-voltage circuit breaker in actual operation are respectively;
the calculation formula of the reference parameter of the high-voltage circuit breaker is as follows,
in the formula, DkIs a reference parameter of the kth brand-new circuit breaker,
Hf、
fcrespectively is a time domain peak value number parameter, an energy entropy, a time domain peak value size parameter and a frequency center of the brand-new circuit breaker;
in the formula, k is the number of brand new circuit breakers.
Sixthly, calculating a high-voltage circuit breaker state evaluation coefficient M, and then evaluating the state of the high-voltage circuit breaker:
the high-voltage circuit breaker state evaluation coefficient M is,
and evaluating the state of the high-voltage circuit breaker according to the state evaluation coefficient, wherein the evaluation coefficient value is larger for the high-voltage circuit breaker with worse state.
FIG. 3 shows the vibration signals of the high-voltage circuit breakers collected when 5 brand-new circuit breakers are opened and closed, and the reference parameter 712e of the brand-new high-voltage circuit breakers can be obtained by processing and calculating the waveforms4。
FIG. 4 shows a vibration signal collected during the operation of a high-voltage circuit breaker and a fault circuit breaker, respectively, and the evaluation parameters of the circuit breaker state obtained by processing and calculating the vibration signal are 2688e3.6、1123e5.3The high-voltage breaker evaluation coefficients were 1.53 and 4.79, respectively.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A vibration signal based high voltage circuit breaker condition evaluation system comprising:
the device comprises a piezoelectric acceleration sensor (6), a preamplifier (7), a data collector (8) and a terminal (9);
the piezoelectric acceleration sensor (6) comprises a first piezoelectric acceleration sensor (6a) and a second piezoelectric acceleration sensor (6 b);
the high-voltage circuit breaker vibration detection device is characterized in that a first piezoelectric acceleration sensor (6a) and a second piezoelectric acceleration sensor (6b) are respectively installed on a breaking element box (3) and a transmission element box (2) of a high-voltage circuit breaker (10), vibration signals of the high-voltage circuit breaker (10) collected by the first piezoelectric acceleration sensor (6a) and the second piezoelectric acceleration sensor (6b) are input into a data collector (8) after being amplified by a preamplifier (7), and the data collector (8) inputs signals into a terminal (9) for processing.
2. A vibration signal-based state evaluation method for a high-voltage circuit breaker, using the vibration signal-based state evaluation system for a high-voltage circuit breaker according to claim 1, comprising the steps of:
the method comprises the following steps of firstly, obtaining a vibration signal of the high-voltage circuit breaker, denoising and drawing a curve:
obtaining vibration signals of the high-voltage circuit breaker through the first piezoelectric acceleration sensor and the second piezoelectric acceleration sensor, denoising the obtained vibration signals, and drawing the vibration signals at different frequencies fiTime domain waveform curve of
Secondly, calculating the characteristic parameters of the vibration signals:
calculating a time domain waveform curve
Energy characterizing parameters of
Unit is V2S; energy entropy Hf(ii) a Time domain peak size parameter
The unit is V; time domain peak number parameter
Center of frequency fcIn Hz;
energy characterizing parameters
The formula (2) is calculated as,
in the formula, t1Is a wave curve
The starting time of (2) in seconds; t is t2Calculating the termination time of the energy characterization parameters in seconds;
normalizing energy characterization parameters by using a calculation formula,
in the formula (f)iRepresents the ith frequency in Hz;
energy entropy HfThe formula (2) is calculated as,
the time domain peak size parameter
The formula (2) is calculated as,
in the formula (I), the compound is shown in the specification,
is a frequency fiT on the time domain curve of the time signal1～t2The size of n peak values in the time domain is V, and the number of the time domain peak values is a parameter
Is at a frequency fiTime domain curve of (d) at t1～t2The number of internal peaks;
center of frequency fcThe formula (2) is calculated as,
in the formula (I), the compound is shown in the specification,
the time domain peak value size parameter under the ith frequency is represented by the unit V;
the third step: repeating the first step to the second step to obtain a plurality of groups of brand new high-voltage circuit breakers in total when the high-voltage circuit breakers are normally switched on and off
Hf、
fcEach characteristic parameter is used as a benchmark;
fourthly, calculating a state evaluation parameter C and a reference parameter D of the high-voltage circuit breakerkAnd averaging multiple groups of reference parameters to obtain an average value Davg：
The high-voltage circuit breaker state evaluation parameter is calculated by the following formula,
wherein C is an evaluation parameter of the high-voltage circuit breaker in actual operation,
Hf0、
fctime domain peak value number parameters, energy entropy, time domain peak value size parameters and frequency centers of the high-voltage circuit breaker in actual operation are respectively;
the calculation formula of the reference parameter of the high-voltage circuit breaker is as follows,
in the formula, DkIs a reference parameter of the kth brand-new circuit breaker,
Hf、
fcrespectively is a time domain peak value number parameter, an energy entropy, a time domain peak value size parameter and a frequency center of the brand-new circuit breaker;
sixthly, calculating a high-voltage circuit breaker state evaluation coefficient M, and then evaluating the state of the high-voltage circuit breaker:
the high-voltage circuit breaker state evaluation coefficient M is,
and evaluating the state of the high-voltage circuit breaker according to the state evaluation coefficient, wherein the evaluation coefficient value is larger for the high-voltage circuit breaker with worse state.
3. The method for evaluating the state of a high-voltage circuit breaker based on vibration signals as claimed in claim 2, wherein in the first step, the acquired vibration signals are denoised by a wavelet denoising method.
4. Method for the state evaluation of a high-voltage circuit breaker on the basis of vibration signals according to claim 2, characterized in that in the second step, t2Value 20 seconds, t1The value is 0.
5. The method for evaluating the state of a high voltage circuit breaker based on vibration signals according to claim 2, wherein in the third step, the plurality of groups are 5 groups; in the fourth step, 5 groups of reference parameters are averaged to obtain a value DavgThe formula is as follows,
in the formula, k is the number of brand new circuit breakers.
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