CN112630638B - Method and system for identifying flashover of porcelain bushing of circuit breaker - Google Patents
Method and system for identifying flashover of porcelain bushing of circuit breaker Download PDFInfo
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- CN112630638B CN112630638B CN202011346203.8A CN202011346203A CN112630638B CN 112630638 B CN112630638 B CN 112630638B CN 202011346203 A CN202011346203 A CN 202011346203A CN 112630638 B CN112630638 B CN 112630638B
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- 229910052573 porcelain Inorganic materials 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000005684 electric field Effects 0.000 claims abstract description 117
- 238000005259 measurement Methods 0.000 claims abstract description 22
- 239000012212 insulator Substances 0.000 claims abstract description 9
- 238000001914 filtration Methods 0.000 claims description 6
- 238000009422 external insulation Methods 0.000 claims description 5
- 230000003044 adaptive effect Effects 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 9
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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Abstract
The application discloses a method and a system for identifying flashover of a porcelain bushing of a circuit breaker, wherein the method comprises the following steps: step 1: setting electric field intensity measuring points around the ABC three-phase porcelain bushing of the circuit breaker; step 2: acquiring the power frequency electric field intensity of a measurement point on line; step 3: fitting a three-phase electric field intensity value U-shaped curve by using the electric field intensity value obtained by the measurement point location; step 4: and identifying whether the insulator flashover fault occurs to the circuit breaker according to the fitted three-phase electric field intensity value U-shaped curve. The invention utilizes the U-shaped symmetry of the electric field intensity near the three-phase porcelain bushing, can realize the on-line identification of the flashover fault of the porcelain bushing of the breaker, improves the monitoring level of the flashover fault of the porcelain bushing of the breaker, and reduces the monitoring cost.
Description
Technical Field
The invention belongs to the technical field of on-line monitoring of electrical equipment of a transformer substation, and relates to a method and a system for identifying flashover of a porcelain bushing of a circuit breaker.
Background
The circuit breaker is a key device of a transformer substation, the reliability of the circuit breaker relates to safe and stable operation of a power grid, and the insulator flashover is a latent defect of the circuit breaker in an operation state, so that the insulation strength of the insulator is reduced, and even the explosion of the circuit breaker is caused.
When flashover occurs, optical, electric and thermal transient multi-physical effects are mutually coupled, and the electric field strength can reflect the flashover fault of the porcelain bushing along with the severe change of a plurality of characteristic physical quantities including the electric field strength, but the actual measurement value of the field strength is influenced by a large number of field factors, and the flashover of the porcelain bushing is difficult to accurately judge only by the amplitude of the electric field strength.
At present, no on-line monitoring method for the flashover of the porcelain bushing of the circuit breaker exists, and an electrical test is generally carried out on the external insulation of the porcelain bushing after power failure to judge whether the flashover fault of the porcelain bushing occurs to the circuit breaker. Because the electrical test is performed in a power failure state, the flashover problem cannot be effectively found out from the normal operation state of high-voltage electrical equipment such as a breaker when the breaker is electrified. Meanwhile, the power failure of the high-voltage electrical equipment is high in cost.
Through the field actual measurement of a large number of substations above 220kV, the following is found: when the high-voltage circuit breaker porcelain bushing is in a charged state and has no flashover, the electric field intensity near the tail end of the phase porcelain bushing of the circuit breaker A, C is higher, the electric field intensity near the tail end of the phase B porcelain bushing is lower, and the three-phase field intensity is symmetrically distributed in a U shape; when the flashover of the porcelain bushing of the circuit breaker occurs, the U-shaped symmetry of the electric field intensity at the tail end of the three-phase porcelain bushing of the circuit breaker is broken. The rule summarized according to field experience is an important premise of the invention.
Disclosure of Invention
In order to solve the defects in the prior art, the application provides a method and a system for identifying the flashover of the porcelain bushing of the circuit breaker, which utilize the U-shaped symmetry of the electric field intensity near the three-phase porcelain bushing to realize the identification of the flashover of the porcelain bushing and improve the monitoring level of the flashover fault of the porcelain bushing of the circuit breaker.
In order to achieve the above object, the present invention adopts the following technical scheme:
a method for identifying flashover of a porcelain bushing of a circuit breaker, the method comprising the steps of:
step 1: setting electric field intensity measuring points around the ABC three-phase porcelain bushing of the circuit breaker;
step 2: acquiring the power frequency electric field intensity of a measurement point on line;
step 3: fitting a three-phase electric field intensity value U-shaped curve by using the electric field intensity value obtained by the measurement point location;
step 4: and identifying whether the insulator flashover fault occurs to the circuit breaker according to the fitted three-phase electric field intensity value U-shaped curve.
The invention further comprises the following preferable schemes:
preferably, in step 1, the lower part of the three-phase porcelain bushing of the breaker beam ABC is selected as three measuring points, three measuring terminals are respectively arranged, and the electric field intensity of the three measuring points is continuously measured.
Preferably, in step 2, the frequency of the interference signal other than the on-site power frequency signal is estimated in advance based on the on-site electric field strength analysis, and the interference signal of the estimated frequency band is suppressed by using a multiple trap based on the adaptive notch technique.
Preferably, step 2 specifically comprises the following steps:
step 2.1: analyzing the field intensity near the current breaker to obtain an electric field intensity component corresponding to the frequency of the interference signal except the current field power frequency signal;
step 2.2: according to the data processing capability of the device, the interference frequency of k bits before the amplitude of the electric field intensity component of the interference signal is screened out to form a frequency vector of the interference signal;
if the amplitude of the electric field intensity component of a certain interference signal is k in front but the absolute value is very small, the influence of the interference frequency is considered weak, and the dimension of the column vector is zero-filled;
step 2.3: taking the frequency vector of the interference signal as the estimation of the frequency vector of the interference signal except the next-period on-site power frequency signal;
step 2.4: based on the self-adaptive notch technology, filtering interference signals with k frequencies with the largest influence by using a multiple notch filter;
if n zero elements exist in the frequency vector of the interference signal, filtering the interference signal with k-n frequencies affecting the maximum;
step 2.5: and acquiring the power frequency electric field intensity of the measurement point, which is affected by the interference signals.
Preferably, in step 3, a three-phase electric field intensity value U-shaped curve is drawn according to the electric field intensity values of the three measuring points and the selected U-shaped curve function type;
the three-phase electric field intensity value U-shaped curve is characterized in that the Y axis is the electric field intensity, the x axis is the distance from the B phase measuring point, and the vertical line of the position of the B phase measuring point of the circuit breaker is taken as a continuous function g (x) of a symmetry axis, and the function consists of two half branches, and the two half branches are respectively formed by continuous guidable functions g 1 (x)、g 2 (x) Composition, the two halves being conjugated at x=0 as a continuous function;
the U-shaped curve function type is respectively parabolic, folded line type and potential function type.
Preferably, g is a parabolic three-phase electric field intensity value U-shaped curve 1 (x)、g 2 (x) The method comprises the following steps of:
wherein x is the distance from other measuring points to the B-phase measuring point;
taking three measuring points as an example, the electric field intensity E of the measuring points is measured by the method of C phase and A phase c 、E A And (3) simultaneous:
parameter alpha of U-shaped curve of three-phase electric field intensity value can be estimated 1 And gamma, wherein x max The distance from the A phase measuring point to the B phase measuring point is set.
Preferably, for a U-shaped curve of the intensity values of the zigzag three-phase electric field, g 1 (x)、g 2 (x) The method comprises the following steps of:
taking three measuring points as an example, the electric field intensity E of the measuring points is measured by the method of C phase and A phase c 、E A And (3) simultaneous:
parameter alpha of U-shaped curve of three-phase electric field intensity value can be estimated 1 And gamma, wherein x max The distance from the A phase measuring point to the B phase measuring point is set.
Preferably, for a U-shaped curve, g, of the intensity values of the three-phase electric field of the potential function type 1 (x)、g 2 (x) The method comprises the following steps of:
taking three measuring points as an example, the electric field intensity E of the measuring points is measured by the method of C phase and A phase c 、E A And (3) simultaneous:
parameter alpha of U-shaped curve of three-phase electric field intensity value can be estimated 1 And gamma, wherein x max The distance from the A phase measuring point to the B phase measuring point is set.
Preferably, in step 4, the parameter alpha of the U-shaped curve is based on the three-phase electric field intensity values 1 And gamma, calculating an flashover alarm indicator UAI:
when the flashover alarm index UAI exceeds the flashover alarm index threshold, judging that the flashover alarm index is out of limit;
when the out-of-limit frequency of the flashover alarm index is larger than a set value, the flashover alarm index is judged to be abnormal in external insulation, namely, the flashover fault of the porcelain bushing occurs, and an alarm signal is sent out.
The invention also discloses a circuit breaker porcelain bushing flashover identification system of the circuit breaker porcelain bushing flashover identification method, which comprises the following steps:
the measuring point setting module is used for setting electric field intensity measuring points around the ABC three-phase porcelain bushing of the circuit breaker;
the electric field intensity measuring module is used for obtaining the power frequency electric field intensity of the measuring point position;
the curve fitting module is used for fitting a U-shaped curve of the three-phase electric field intensity values by using the electric field intensity values obtained by the measurement points;
and the fault identification module is used for identifying whether the insulator flashover fault occurs to the circuit breaker according to the fitted three-phase electric field intensity value U-shaped curve.
The beneficial effect that this application reached:
the invention utilizes the U-shaped symmetry of the electric field intensity near the three-phase porcelain bushing, can realize the on-line identification of the flashover fault of the porcelain bushing of the breaker, improves the monitoring level of the flashover fault of the porcelain bushing of the breaker, and reduces the monitoring cost.
Drawings
FIG. 1 is a schematic flow chart of a method for identifying flashover of a porcelain bushing of a circuit breaker according to the present invention;
FIG. 2 is a schematic diagram of measuring the power frequency electric field intensity of a measurement point in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a U-shaped curve fit of three-phase electric field intensity values in an embodiment of the invention;
FIG. 4 is a graph showing the result of identifying whether a porcelain bushing flashover fault occurs in the interrupt circuit according to the embodiment of the present invention.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present invention and are not intended to limit the scope of protection of the present application.
As shown in fig. 1, the method for identifying the flashover of the porcelain bushing of the circuit breaker comprises the following steps:
step 1: setting electric field intensity measuring points around the ABC three-phase porcelain bushing of the circuit breaker;
in theory, if the electric field intensity is continuously measured along the same horizontal line, a better U-shaped curve can be obtained, and considering the arrangement cost of the measuring terminals, in the embodiment of the invention, the lower part of the three-phase porcelain bushing of the cross beam ABC of the breaker is selected as three measuring points, the three measuring terminals are respectively arranged, and the electric field intensity of the three measuring points is continuously measured.
Step 2: acquiring the power frequency electric field intensity of a measurement point on line;
as shown in fig. 2, in the embodiment of the invention, based on the analysis of the field electric field intensity, the frequency of the interference signal except the field power frequency signal is estimated in advance, and based on the adaptive notch technique, the interference signal of the estimated frequency band is suppressed by using a multiple notch filter, so as to finally obtain the power frequency electric field intensity of the measurement point.
The method comprises the following steps:
step 2.1: analyzing the field intensity near the current breaker to obtain the field intensity component E corresponding to the frequency of the interference signal except the current field power frequency signal f(i) ；
Step 2.2: according to the data processing capability of the device, the interference frequency of the first 6 bits of the amplitude of the electric field intensity component of the interference signal is screened out to form a frequency vector (6-dimensional column vector) of the interference signal
If the amplitude of the electric field intensity component of a certain interference signal is 6 in advance but the absolute value is very small, the influence of the interference frequency is considered weak, and the dimension of the column vector is zero-filled;
step 2.3: taking the frequency vector of the interference signal as the estimation of the frequency vector of the interference signal except the next-period on-site power frequency signal;
step 2.4: filtering interference signals with 6 frequencies, which are influenced maximally, by utilizing a multiple wave trap based on an adaptive notch technology;
if n zero elements exist in the frequency vector of the interference signal, filtering the interference signal with the frequency of 6-n which affects the maximum;
step 2.5: and acquiring the power frequency electric field intensity of the measurement point, which is affected by the interference signals.
The invention can realize rapid and accurate measurement of 25 times/s.
Step 3: fitting a three-phase electric field intensity value U-shaped curve by using the electric field intensity values obtained by the measuring points, and specifically:
drawing a three-phase electric field intensity value U-shaped curve according to the electric field intensity values of the three measuring points and the selected U-shaped curve function type;
as shown in fig. 3, the Y-axis is the electric field strength and the x-axis is the distance from the B-phase measurement point. The three-phase electric field intensity value U-shaped curve is generally fit into a continuous function g (x) which takes the vertical line of the position of the phase B measuring point of the breaker as a symmetry axis, and the function consists of two half branches, and the two half branches are respectively formed by continuous derivative functions g 1 (x)、g 2 (x) Composition, the two halves being conjugated at x=0 as a continuous function;
the U-shaped curve function type is respectively parabolic, folded line type and potential function type.
(1) For a parabolic three-phase electric field intensity value U-shaped curve g 1 (x)、g 2 (x) The method comprises the following steps of:
wherein x is the distance from the phase B measuring point;
taking three measuring points fitting as an example in the embodiment of the invention, the electric field intensity E is measured by measuring points with C phase and A phase c 、E A And (3) simultaneous:
parameter alpha of U-shaped curve of three-phase electric field intensity value can be estimated 1 And gamma, wherein x max The distance from the A phase measuring point to the B phase measuring point is set.
(2) For U-shaped curve of intensity value of broken line type three-phase electric field, g 1 (x)、g 2 (x) The method comprises the following steps of:
taking three measurement points fitting as an example, by phase CElectric field intensity E of A phase measurement point c 、E A And (3) simultaneous:
parameter alpha of U-shaped curve of three-phase electric field intensity value can be estimated 1 And gamma, wherein x max The distance from the A phase measuring point to the B phase measuring point is set. .
(3) For a U-shaped curve of the intensity value of a potential function type three-phase electric field, g 1 (x)、g 2 (x) The method comprises the following steps of:
taking three measuring points as an example, the electric field intensity E of the measuring points is measured by the method of C phase and A phase c 、E A And (3) simultaneous:
parameter alpha of U-shaped curve of three-phase electric field intensity value can be estimated 1 And gamma, wherein x max The distance from the A phase measuring point to the B phase measuring point is set. .
Step 4: and identifying whether the insulator flashover fault occurs to the circuit breaker according to the fitted three-phase electric field intensity value U-shaped curve.
The invention provides an asymmetric U-shaped curve index (U-type Asymmetric Index, UAI) for comparing the symmetry degree of the U-shaped curve.
If a U-shaped curve function can be decomposed as follows:
g(x)＝f(I)+η(x)
where η (x) is a function of x and f (I) is independent of x.
When X > 0, note x=x, and UAI is defined as follows:
obviously, if the fitted U-shaped curve function g (x) has a symmetrical structure, η (x) also has a symmetrical structure, so that η (x) =η (-x) is satisfied, and at this time, UAI takes a value of 0.
Similarly, several typical UAIs may be extrapolated.
(1) Parabolic type
η(X)＝α 1 X 2
η(-X)＝(α 1 +γ)X 2
(2) Folded line type
η(X)＝α 1 X
η(-X)＝(α 1 +γ)X
(3) Potential function type
η(X)＝α 1 X δ
η(-X)＝(α 1 +γ)X δ
The asymmetry of the U-shaped curve can be conveniently measured using the UAI.
That is, in the specific embodiment, the parameter alpha of the U-shaped curve is based on the three-phase electric field intensity values 1 And gamma, calculating an flashover alarm indicator UAI:
setting a flashover alarm index threshold according to field experience;
when the flashover alarm index UAI exceeds the flashover alarm index threshold, if the absolute value of the flashover alarm index UAI is more than 0.25, judging that the flashover alarm index is out of limit;
when the out-of-limit frequency of the flashover alarm index is larger than a set value, the flashover alarm index is judged to be abnormal in external insulation, namely, the flashover fault of the porcelain bushing occurs, and an alarm signal is sent out.
The identification of the insulator flashover fault of the U-shaped curve of the parabolic three-phase electric field intensity value is taken as an example.
In accordance with the principle of the present invention,and->Estimating the parameter alpha of the U-shaped curve of the intensity value of the three-phase electric field 1 And γ, as shown in table 1.
Model 1U variant curve fitting
The UAI at this time was calculated as:
the UAI is more than 0.25, and the flashover alarm index is out of limit.
Meanwhile, the fact that the field electric field intensity is always in dynamic change is considered, and the 1-time flashover alarm index out-of-limit possibly has accidental. When more than 15 asymmetric indexes cross the boundary in the measurement for 25 times in 1s, the external insulation abnormality is judged, and an alarm signal is sent, as shown in fig. 4, the electric field intensity of the three-phase measurement points is reflected by three lines on the right side of fig. 4, the electric field intensity is in a normal state before 1s, and the electric field intensity is in a flashover state after 1s, which correspond to the normal state and the flashover state in fig. 3 respectively.
The invention discloses a circuit breaker porcelain bushing flashover identification system, which comprises the following components:
the measuring point setting module is used for setting electric field intensity measuring points around the ABC three-phase porcelain bushing of the circuit breaker;
the electric field intensity measuring module is used for obtaining the power frequency electric field intensity of the measuring point position;
the curve fitting module is used for fitting a U-shaped curve of the three-phase electric field intensity values by using the electric field intensity values obtained by the measurement points;
and the fault identification module is used for identifying whether the insulator flashover fault occurs to the circuit breaker according to the fitted three-phase electric field intensity value U-shaped curve.
The invention utilizes the U-shaped symmetry of the electric field intensity near the three-phase porcelain bushing, can realize the on-line identification of the flashover fault of the porcelain bushing of the breaker, improves the monitoring level of the flashover fault of the porcelain bushing of the breaker, and reduces the monitoring cost.
While the applicant has described and illustrated the embodiments of the present invention in detail with reference to the drawings, it should be understood by those skilled in the art that the above embodiments are only preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not to limit the scope of the present invention, but any improvements or modifications based on the spirit of the present invention should fall within the scope of the present invention.
Claims (8)
1. A method for identifying flashover of a porcelain bushing of a circuit breaker is characterized by comprising the following steps of:
the method comprises the following steps:
step 1: setting electric field intensity measuring points around the ABC three-phase porcelain bushing of the circuit breaker;
step 2: acquiring the power frequency electric field intensity of a measurement point on line;
step 3: fitting a three-phase electric field intensity value U-shaped curve by using the electric field intensity values obtained by the measuring points, wherein the fitting comprises the following steps: drawing a three-phase electric field intensity value U-shaped curve according to the electric field intensity values of the three measuring points and the selected U-shaped curve function type; the three-phase electric field intensity value U-shaped curve is that the Y axis is the electric field intensity, the x axis is the distance from the B phase measuring point, and the B phase of the breaker is adoptedThe perpendicular to the measuring point is a continuous function g (x) of the symmetry axis, which consists of two halves, each of which consists of a continuous derivative function g 1 (x)、g 2 (x) Composition, the two halves being conjugated at x=0 as a continuous function; the U-shaped curve function type is parabolic, folded line type and potential function type respectively, and can estimate the parameter alpha of the U-shaped curve of the three-phase electric field intensity value 1 And γ;
step 4: according to the fitted three-phase electric field intensity value U-shaped curve, identifying whether the breaker has a porcelain bushing flashover fault or not, comprising the following steps: parameter alpha of U-shaped curve according to three-phase electric field intensity value 1 And gamma, calculating an flashover alarm indicator UAI:when the flashover alarm index UAI exceeds the flashover alarm index threshold, judging that the flashover alarm index is out of limit; when the out-of-limit frequency of the flashover alarm index is larger than a set value, the flashover alarm index is judged to be abnormal in external insulation, namely, the flashover fault of the porcelain bushing occurs, and an alarm signal is sent out.
2. The method for identifying the flashover of the porcelain bushing of the circuit breaker according to claim 1, wherein the method comprises the following steps:
in the step 1, the lower part of a three-phase porcelain bushing of a cross beam ABC of a circuit breaker is selected as three measuring points, three measuring terminals are respectively arranged, and the electric field intensity of the three measuring points is continuously measured.
3. The method for identifying the flashover of the porcelain bushing of the circuit breaker according to claim 1, wherein the method comprises the following steps:
in step 2, based on the analysis of the field electric field intensity, the frequency of the interference signal except the field power frequency signal is estimated in advance, and based on the adaptive notch technology, the interference signal of the estimated frequency band is suppressed by using a multiple notch filter.
4. The method for identifying the flashover of the porcelain bushing of the circuit breaker according to claim 1, wherein the method comprises the following steps:
the step 2 specifically comprises the following steps:
step 2.1: analyzing the field intensity near the current breaker to obtain an electric field intensity component corresponding to the frequency of the interference signal except the current field power frequency signal;
step 2.2: screening the interference frequencies k bits before the amplitude of the electric field intensity component of the interference signal to form a frequency vector of the interference signal;
if the amplitude of the electric field intensity component of a certain interference signal is k in front but the absolute value is very small, the interference frequency is considered to have weak influence, and the dimension of the frequency vector column vector is zero-filled;
step 2.3: taking the frequency vector of the interference signal as the estimation of the frequency vector of the interference signal except the next-period on-site power frequency signal;
step 2.4: based on the self-adaptive notch technology, filtering interference signals with k frequencies with the largest influence by using a multiple notch filter;
if n zero elements exist in the frequency vector of the interference signal, filtering the interference signal with k-n frequencies affecting the maximum;
step 2.5: and acquiring the power frequency electric field intensity of the measurement point, which is affected by the interference signals.
5. The method for identifying the flashover of the porcelain bushing of the circuit breaker according to claim 1, wherein the method comprises the following steps:
for a parabolic three-phase electric field intensity value U-shaped curve g 1 (x)、g 2 (x) The method comprises the following steps of:
wherein x is the distance from other measuring points to the B-phase measuring point;
taking three measuring points as an example, the electric field intensity E of the measuring points is measured by the method of C phase and A phase c 、E A And (3) simultaneous:
parameter alpha of U-shaped curve of three-phase electric field intensity value can be estimated 1 And gamma, wherein x max The distance from the A phase measuring point to the B phase measuring point is set.
6. The method for identifying the flashover of the porcelain bushing of the circuit breaker according to claim 5, wherein the method comprises the following steps:
for U-shaped curve of intensity value of broken line type three-phase electric field, g 1 (x)、g 2 (x) The method comprises the following steps of:
taking three measuring points as an example, the electric field intensity E of the measuring points is measured by the method of C phase and A phase c 、E A And (3) simultaneous:
parameter alpha of U-shaped curve of three-phase electric field intensity value can be estimated 1 And gamma, wherein x max The distance from the A phase measuring point to the B phase measuring point is set.
7. The method for identifying the flashover of the porcelain bushing of the circuit breaker according to claim 5, wherein the method comprises the following steps:
for a U-shaped curve of the intensity value of a potential function type three-phase electric field, g 1 (x)、g 2 (x) The method comprises the following steps of:
taking three measuring points as an example, the electric field intensity E of the measuring points is measured by the method of C phase and A phase c 、E A And (3) simultaneous:
parameter alpha of U-shaped curve of three-phase electric field intensity value can be estimated 1 And gamma, wherein x max The distance from the A phase measuring point to the B phase measuring point is set.
8. A circuit breaker porcelain bushing flashover identification system according to any of claims 1-7, characterized in that:
the system comprises:
the measuring point setting module is used for setting electric field intensity measuring points around the ABC three-phase porcelain bushing of the circuit breaker;
the electric field intensity measuring module is used for obtaining the power frequency electric field intensity of the measuring point position;
the curve fitting module is used for fitting a U-shaped curve of the three-phase electric field intensity values by using the electric field intensity values obtained by the measurement points;
and the fault identification module is used for identifying whether the insulator flashover fault occurs to the circuit breaker according to the fitted three-phase electric field intensity value U-shaped curve.
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