CN114509705A - Transformer state monitoring device and method based on strain characteristics of explosion-proof material - Google Patents
Transformer state monitoring device and method based on strain characteristics of explosion-proof material Download PDFInfo
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The transformer state monitoring device and method based on the strain characteristics of the explosion-proof material comprise a strain monitoring unit, an alarm unit, an oil pressure starting unit, a current starting unit and a porous metal explosion-proof unit capable of absorbing energy; the oil pressure starting unit, the current starting unit and the porous metal explosion-proof unit are all connected with the strain monitoring unit, and the strain monitoring unit is connected with the alarm unit. According to the invention, the strain sensor arranged between the converter transformer and the porous metal layer is utilized to quickly sense the strain characteristic quantity of the porous metal explosion-proof membrane in the converter transformer, so that the complex environment of high temperature, oil stain and strong electromagnetism in the converter transformer can be satisfied regardless of the precision and the application range. The device is independent of the power system, does not generate harmonic interference in the operation and use process, and does not influence the operation of the power system.
Description
Technical Field
The invention belongs to the technical field of non-electric quantity protection of transformers of power systems, and particularly relates to a transformer state monitoring device and method based on strain characteristics of an explosion-proof material.
Background
The converter transformer is an important device in a power system, and the stable operation of the converter transformer is an important prerequisite for ensuring the reliable transportation, flexible distribution and safe use of electric energy of the power system. The transformer is provided with differential protection, current quick-break protection, overcurrent protection, overload protection, zero-sequence current protection, over-excitation protection and other electric quantity protection, gas protection and other non-electric quantity protection. However, after the fault occurs, the relay protection discriminates the fault through a protection criterion, and a tripping action signal is generated to rapidly remove the fault so as to prevent further damage to the power equipment or further impact on the system. It follows that the relay protection of the power system is a passive protection by removing faults. And the change of the characteristic quantities of the power system and the power equipment is monitored on line, and the health states of the power system and the power equipment are evaluated according to the analysis and calculation of the monitoring result, so that the active defense mode is used for determining whether the maintenance is required. The method is beneficial to preventing accidents in the bud, avoiding the failure of the power equipment and improving the safety of the power system.
In recent years, a failure accident of a transformer frequently occurs, and a large economic loss is caused along with complicated characteristics such as an increase in oil pressure, deformation of an oil tank, and oil flow surge.
Therefore, a transformer state monitoring device and a method capable of rapidly and reliably analyzing and evaluating the state of the transformer are urgently needed for monitoring the state of the transformer in a complex physical environment of the transformer.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a transformer state monitoring device and method based on strain characteristics of an explosion-proof material, which can improve mechanical properties and explosion-proof properties of a converter transformer, and simultaneously realize monitoring and evaluation of the state of the converter transformer by monitoring, analyzing and recording the strain characteristics of a porous metal material inside the converter transformer.
In order to achieve the purpose, the invention adopts the following technical scheme:
the transformer state monitoring device based on the strain characteristics of the explosion-proof material comprises a strain monitoring unit, an alarm unit, an oil pressure starting unit, a current starting unit and a porous metal explosion-proof unit capable of absorbing energy;
the oil pressure starting unit, the current starting unit and the porous metal explosion-proof unit are all connected with the strain monitoring unit, and the strain monitoring unit is connected with the alarm unit.
Further, the oil pressure starting unit comprises an oil pressure sensor arranged on the side wall of the oil tank of the converter transformer;
the current starting unit comprises a current transformer arranged at the outgoing line of the network side winding of the converter transformer.
Further, the porous metal explosion-proof unit comprises a porous metal explosion-proof membrane, the porous metal explosion-proof membrane comprises a front panel, a rear panel and more than two closed-cell foam metal layers arranged between the front panel and the rear panel, and the density of each closed-cell foam metal layer is different.
Furthermore, the closed-cell foam metal layers are sequentially arranged from the front panel to the rear panel according to the density from high to low.
Furthermore, the front panel is in contact with the insulating oil, and the rear panel is in contact with the wall of the converter transformer tank.
Further, the closed cell metal foam layer comprises a first closed cell metal foam layer and a second closed cell metal foam layer, and the density of the first closed cell metal foam layer is 0.48g/cm3The density of the second closed cell metal foam layer is 0.23g/cm3The first closed cell metal foam layer is in contact with the front panel and the second closed cell metal foam layer is bonded to the back panel.
Further, the strain monitoring unit comprises a strain sensor, and the strain sensor is arranged between the adjacent closed-cell foam metal layers.
The transformer state monitoring method based on the strain characteristics of the explosion-proof material based on the device comprises the following steps:
step 1: measuring real-time oil pressure through an oil pressure sensor arranged on the side wall of an oil tank of the converter transformer to obtain the oil pressure characteristic quantity of real-time insulating oil; measuring the effective value of the current flowing through a network side winding of the converter transformer through a current transformer;
step 2: comparing whether the effective value of the current exceeds a preset current starting threshold value, if so, sending a starting signal to the strain monitoring unit and entering the step 3, otherwise, not sending the starting signal; judging whether the amplitude of the oil pressure characteristic quantity of the real-time insulating oil exceeds an oil pressure starting threshold value or not, if so, sending a starting signal to a strain monitoring unit and entering the step 3, otherwise, returning to the step 1;
and step 3: measuring the real-time strain characteristics of the porous metal explosion-proof layer through a strain sensor arranged in the porous metal explosion-proof unit to obtain real-time strain characteristic quantity; calculating comprehensive strain according to the real-time strain characteristic quantity;
and 4, step 4: judging whether the comprehensive strain exceeds a strain monitoring threshold value, if so, entering a step 5, otherwise, returning to the step 1;
and 5: and sending a strain alarm signal, and storing the transient oil pressure at the side wall of the transformer oil tank 500ms before and after the alarm, the transient current flowing through the net side winding and the transient strain data of the porous material.
Further, the oil pressure starting threshold value psetComprises the following steps:
wherein, K1Is a first setting coefficient, K2Is a second setting coefficient, vmaxThe maximum value of the oil pressure at the side wall of the oil tank of the converter transformer under the excitation inrush current of the converter transformer is obtained.
Further, the integrated strain ε (t) is calculated by the following formula:
λ1+λ2+λ3＝1
wherein λ is1Is a first calibration factor, λ2As a second calibration factor, λ3Is a third calibration factor, ε1(t)，ε2(t)，ε3(t) and ε4(t) respectively measuring strain values of four closed-cell foam metal layers on the front side, the rear side, the left side and the right side of the oil tank under the normal operation of the converter transformer, wherein epsilon is5And (t) is a measured strain value of a closed-cell foam metal layer positioned on the top of the oil tank under the normal operation of the converter transformer.
Compared with the prior art, the invention has the following beneficial effects:
the invention utilizes the porous metal explosion-proof unit arranged in the converter transformer to absorb energy, reduces the pressure intensity of insulating oil, improves the integral bearing limit of the converter transformer and improves the explosion-proof performance of the converter transformer. Meanwhile, the porous metal explosion-proof unit is simple in structure and easy to realize, and the closed-cell structure also meets the use environment of oil stains in the converter transformer. According to the invention, the strain sensor arranged between the converter transformer and the porous metal layer is utilized to quickly sense the strain characteristic quantity of the porous metal explosion-proof membrane in the converter transformer, so that the complex environment of high temperature, oil stain and strong electromagnetism in the converter transformer can be satisfied regardless of the precision and the application range. The device is independent of the power system, does not generate harmonic interference in the operation and use process, and does not influence the operation of the power system.
When the converter transformer is in an internal failure or abnormal operation state, the internal oil pressure of the converter transformer rises, and the strain of each closed-cell foam metal layer on the wall surface is increased. By adopting the method of calculating the comprehensive strain and comparing the comprehensive strain with the strain monitoring threshold value, the probability of misoperation caused by the increase of single wall surface strain caused by external impact or collision can be effectively reduced. The invention judges whether the oil pressure characteristic quantity of the side wall of the converter transformer, the winding current characteristic quantity and the strain characteristic quantity of the porous material reach threshold values by utilizing the oil pressure starting unit, the current starting unit and the strain monitoring unit, thereby realizing the rapid and reliable analysis and evaluation of the state change of the converter transformer.
Drawings
FIG. 1 is a schematic diagram of a transformer state monitoring device based on strain characteristics of an explosion-proof material.
Fig. 2 is a partial schematic view of the porous metal explosion-proof unit.
FIG. 3 is a logic flow diagram of the present invention.
FIG. 4 is a graph showing the results of the measured oil pressure according to the present invention.
FIG. 5 is a graph of measured strain results of the present invention.
In the figure, 1 is an oil pressure starting unit, 2 is a current starting unit, 3 is a porous metal explosion-proof unit, 4 is a strain monitoring unit, 5 is an alarm unit, 6 is a tap switch, 7 is a porous explosion-proof membrane, 8 is a converter transformer, 9 is a front panel, 10 is a rear panel, 11 is a first closed-cell foam metal layer, 12 is a second closed-cell foam metal layer, and 13 is a strain sensor.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In addition, an element of the present invention may be said to be "fixed" or "disposed" to another element, either directly on the other element or with intervening elements present. 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. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Referring to fig. 1, the transformer state monitoring device based on the strain characteristics of the explosion-proof material comprises a porous metal explosion-proof unit 3, an oil pressure starting unit 1, a current starting unit 2, a strain monitoring unit 4 and an alarm unit 5.
The tap changer 6 is an important component of the converter transformer 8 and the location of the arrangement is well known in the art.
The porous metal explosion-proof unit 3 is connected with the strain monitoring unit 4, and the strain monitoring unit 4 is connected with the alarm unit 5.
The abnormal operation state of the converter transformer mainly comprises overload, overexcitation, crossing current flowing through a winding during external faults and the like, and when the converter transformer is in the abnormal operation state, the current effective value in a network side winding of the converter transformer is increased and the winding vibrates, so that the oil flow in the converter transformer is caused to surge. In order to enhance the sensitivity of the converter transformer state monitoring device, the invention adopts a double-starting mode, the starting unit comprises a current starting unit 2 and an oil pressure starting unit 1 which are connected with a strain monitoring unit 4, and when the strain monitoring unit 4 receives a starting signal sent by the current starting unit 2 or the oil pressure starting unit 1, the strain monitoring unit starts and starts to detect the strain information of the porous explosion-proof membrane.
The current starting unit 2 mainly comprises a current transformer arranged at the outlet of the network side winding of the converter transformer, and the current transformer measures the characteristic quantity of current flowing through the network side winding when the converter transformer operates and compares the effective value of the current with the preset current starting threshold value; and if the effective value of the current of the actually measured net side winding is larger than the current starting threshold value, starting the current starting unit 2, and sending a signal to the strain monitoring unit 4, otherwise, continuously measuring the current characteristic. Current start threshold IsetThe following settings are set:
Iset＝krel·ILmax
wherein k isrelFor the reliability factor, take 1.1, ILmaxThe effective value of the current flowing through the winding on the network side in the maximum operation mode can be obtained by calculation according to system parameters.
The oil pressure starting unit 1 mainly comprises an oil pressure sensor arranged on the side wall of the oil tank of the converter transformer, measures the oil pressure characteristic quantity through the oil pressure sensor arranged on the side wall of the oil tank of the converter transformer, and compares the amplitude of the oil pressure characteristic quantity with a preset oil pressure starting threshold value; if the amplitude of the oil pressure characteristic quantity is larger than the oil pressure starting threshold value, the oil pressure starting unit is started, a signal is sent to the strain monitoring unit 4, and if not, the oil pressure characteristic quantity is continuously measured.
Threshold value v for oil pressure startsetThe following settings are set:
wherein, K1Taking 0.9, K as the first setting coefficient2For the second setting coefficient, take 3, pmaxThe maximum value of the oil pressure at the side wall of the oil tank of the converter transformer under the excitation inrush current of the converter transformer is obtained.
The strain monitoring unit 4 comprises a strain sensor, and after the signal of the current starting unit 2 or the signal of the oil flow starting unit 1 is received, the strain characteristics of the closed-cell foam metal layer are measured in real time through the strain sensor positioned in the porous explosion-proof membrane 7. And judging whether the strain state of the porous explosion-proof membrane in the converter transformer reaches an alarm state or not by comparing the strain characteristic quantity amplitude with the strain monitoring threshold value. If the threshold value is exceeded, the alarm state is considered to be reached, and a signal is sent to the alarm unit 5, otherwise, the alarm state is considered not to be reached, and the starting signals of the current starting unit 2 and the oil pressure starting unit 1 are continuously waited.
Threshold value epsilon for strain monitoringsetSetting the comprehensive strain of four side wall surfaces and a top wall surface when the converter transformer normally operates, wherein the value can be set by the following formula:
KI+KII+KIII＝1
εset＝krel·ε0
wherein, KI，KII，KIIISetting coefficients are 0.4, 0.35 and 0.25 respectively. k is a radical of formularelFor the reliability factor, 1.1 was taken. Epsilon1max，ε2max，ε3maxAnd ε4maxThe maximum value of the strain of four closed-cell foam metal layers on the front side, the rear side, the left side and the right side of the oil tank under the normal operation of the converter transformer is respectively epsilon5maxThe maximum value of the strain of the closed-cell foam metal layer on the top of the oil tank under the normal operation of the converter transformer is shown in figure 3.
Referring to fig. 2, the porous metal explosion-proof unit 3 includes a porous metal explosion-proof membrane 7, the porous metal explosion-proof membrane 7 is composed of two or more closed-cell foam metal layers and a metal panel, the densities of the two closed-cell foam metal layers are different, the densities are calculated according to the internal fault oil pressure fluctuation characteristics of the converter transformer, and the two closed-cell foam metal layers are arranged according to the fluctuation characteristic rule.
In this embodiment, the porous metal explosion-proof membrane consists of twoA layer of closed cell metal foam and a front panel 9 and a back panel 10. Each closed cell metal foam layer has a different density of 0.48g/cm3、0.23g/cm3And according to the decreasing law of the wave crest amplitude of the oil pressure, the closed-cell foam metal layers are arranged according to the decreasing order of the density, namely, the first closed-cell foam metal layer with high density is tightly contacted with the front panel, and the second closed-cell foam metal layer with lower density is tightly bonded with the rear panel. And strain sensors are arranged among the layers to measure the strain characteristics of the porous metal material. The porous metal explosion-proof unit 7 is arranged on the inner side of the converter transformer and is tightly connected with the wall surface of the converter transformer.
In this embodiment, the dense porous metal layer is close to the insulating oil, and the dense porous metal layer is close to the wall of the converter transformer 8, i.e. the front panel 9 is in contact with the insulating oil, and the rear panel 10 is in contact with the wall 8 of the converter transformer.
The energy is absorbed through the rapid deformation of the porous metal material in the porous metal explosion-proof unit 3, the insulating oil pressure is reduced, the explosion-proof performance of the converter transformer is improved, and meanwhile, the integral mechanical pressure-bearing limit of the converter transformer is further improved by means of the high specific strength characteristic of the porous material and the mechanical performance of the densified metal matrix.
Referring to fig. 4, the transformer state monitoring method based on the strain characteristics of the explosion-proof material comprises the following steps:
step 1: after the device is electrified and started, a preset oil pressure starting threshold value p is readsetThreshold value I of current starting unitsetAnd strain monitoring threshold εset。
Step 2: measuring real-time oil pressure through an oil pressure sensor arranged on the side wall of an oil tank of the converter transformer, quickly sensing real-time change of the oil pressure, and acquiring real-time oil pressure characteristic quantity p (t) of the side wall of the oil tank; and measuring the effective value I of the current flowing through the network side winding of the converter transformer through a current transformer.
And step 3: comparing whether the effective value I of the real-time current exceeds a preset current starting threshold value I or not through the current starting unit 2setAnd if the voltage exceeds the preset value, sending a starting signal to the strain measuring unit, otherwise, not sending the starting signal. Simultaneous comparison current conversion voltage transformation of oil pressure starting unitWhether the amplitude of the real-time oil pressure characteristic quantity p (t) of the side wall of the oil tank exceeds the oil pressure starting threshold value psetAnd if the oil pressure starting threshold value is exceeded, a starting signal is sent to the strain measuring unit 4, otherwise, the starting signal is not sent. If the strain monitoring unit 4 receives the starting signal, starting and entering the step 4, otherwise, not starting and returning to the step 2;
according to the invention, whether strain monitoring is started or not is judged by the oil pressure starting unit 1 and the current starting unit 2, and the mode of combining the electric quantity characteristic with the non-electric quantity characteristic is adopted, so that the sensitivity of the converter transformer monitoring device can be improved, meanwhile, the interference influence of external impact and the like on a single strain characteristic quantity can be avoided, and the reliability of state monitoring of the converter transformer is improved.
And 4, step 4: measuring the real-time strain characteristics of the porous metal explosion-proof layer by a strain sensor arranged in the porous metal explosion-proof unit to obtain the real-time strain characteristic quantity epsilon of each position of the oil tank wall of the converter transformeri(t), i ═ 1,2,3,4,5, and the integrated strain ∈ (t) was calculated:
λ1+λ2+λ3＝1
wherein λ is1Is a first calibration factor, λ2As a second calibration factor, λ3Is a third calibration factor, λ1Take 0.4, lambda2Take 0.35, λ3Take 0.25. Epsilon1(t)，ε2(t)，ε3(t) and ε4(t) respectively measuring strain values of four closed-cell foam metal layers on the front side, the rear side, the left side and the right side of the oil tank under the normal operation of the converter transformer, wherein epsilon is5And (t) is the measured strain value of the closed-cell foam metal layer positioned on the top of the oil tank under the normal operation of the converter transformer, as shown in figure 3. When an internal fault or abnormal operation state occurs, the internal oil pressure of the converter transformer rises, which can cause the strain of each wall surface closed-cell foam metal layer to increase. Calculating comprehensive strain epsilon (t) and then monitoring strain with threshold value epsilonsetThe contrast method can effectively reduce the influence of exogenous factorsThe probability of malfunction due to increased strain in a single wall surface caused by partial impact or bump.
The strain characteristics of the porous metal are measured by the strain sensors arranged between the porous foam metal layers, the strain characteristic quantity of the porous metal explosion-proof membrane at each position in the converter transformer is quickly obtained, the influence of external impact or shaking on measurement when the strain characteristics of the wall surface of the converter transformer are directly measured can be avoided, and the accuracy of state monitoring and analysis and the reliability of evaluation of the converter transformer are improved.
And 5: whether the comprehensive strain epsilon (t) exceeds a strain monitoring threshold value epsilon or not is judged through a strain monitoring unitsetIf the strain monitoring threshold value is exceeded, entering a step 6, otherwise, returning to the step 2;
step 6: and sending a strain alarm signal through an alarm unit, and simultaneously storing the transient oil pressure of the insulating oil and the transient strain data of the porous explosion-proof membrane for 500ms before and after the alarm, so that the whole device is reset.
According to the invention, the porous metal explosion-proof unit, the oil pressure starting unit, the strain monitoring unit and the alarm unit are organically combined and reasonably matched, so that the whole state monitoring device and method are simple in structure, easy to implement and high in sensitivity.
FIG. 5 shows the results of the test of the specific example. FIG. 5 is a measured strain curve of the porous metal explosion-proof layer during a small spark discharge test inside the converter transformer. As can be seen from the graph 5, the strain characteristics of the porous metal explosion-proof layer of the converter transformer have obvious rapid change when external faults flow through the through current and internal discharge, and the strain characteristics can be used as effective characteristics for monitoring the state of the converter transformer. Meanwhile, when the converter transformer is in a fault or abnormal operation state such as a through current caused by internal short circuit, overload, overexcitation and an external fault, the current flowing through the network side winding of the converter transformer is obviously larger than the rated current, and the current can also be used as an effective characteristic for monitoring the state of the converter transformer. The invention takes the oil pressure and current characteristics of the insulating oil as starting signals, monitors the strain characteristics of the porous metal explosion-proof layer to realize the state monitoring of the converter transformer, and adopts a mode of combining electric quantity and non-electric quantity characteristics to expand the state monitoring method of the converter transformer.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The transformer state monitoring device based on the strain characteristics of the explosion-proof material is characterized by comprising a strain monitoring unit (4), an alarm unit (5), an oil pressure starting unit (1), a current starting unit (2) and a porous metal explosion-proof unit (3) capable of absorbing energy;
the oil pressure starting unit (1), the current starting unit (2) and the porous metal explosion-proof unit (3) are all connected with the strain monitoring unit (4), and the strain monitoring unit (4) is connected with the alarm unit (5).
2. The transformer state monitoring device based on the strain characteristics of the explosion-proof material as recited in claim 1, wherein the oil pressure starting unit (1) comprises an oil pressure sensor arranged at the wall of a transformer tank;
the current starting unit (2) comprises a current transformer arranged at the outgoing line of the network side winding of the converter transformer.
3. The transformer state monitoring device based on the strain characteristics of the explosion-proof material as claimed in claim 1, characterized in that the porous metal explosion-proof unit (3) comprises a porous metal explosion-proof membrane (7), and the porous metal explosion-proof membrane (7) comprises a front panel (9), a rear panel (10) and more than two layers of closed-cell foam metal layers arranged between the front panel (9) and the rear panel (10), wherein the density of each layer of closed-cell foam metal layer is different.
4. The transformer state monitoring device based on the strain characteristics of the explosion-proof material as recited in claim 3, wherein the closed-cell foam metal layers are arranged in the direction from the front panel (9) to the rear panel (10) according to the density from top to bottom.
5. The transformer state monitoring device based on the strain characteristics of the explosion-proof material as recited in claim 4, characterized in that the front panel (9) is in contact with insulating oil, and the rear panel (10) is in contact with the wall (8) of the converter transformer tank.
6. The transformer condition monitoring device based on the strain characteristics of the explosion-proof material as claimed in claim 3, wherein the closed-cell foam metal layer comprises a first closed-cell foam metal layer and a second closed-cell foam metal layer, and the density of the first closed-cell foam metal layer is 0.48g/cm3The density of the second closed cell metal foam layer is 0.23g/cm3The first layer of closed cell metal foam is in contact with the front panel (8) and the second layer of closed cell metal foam is bonded to the rear panel (9).
7. The transformer condition monitoring device based on the strain characteristics of the explosion-proof material as recited in claim 3, characterized in that the strain monitoring unit (3) comprises a strain sensor, and the strain sensor is arranged between adjacent closed-cell foam metal layers.
8. The transformer state monitoring method based on the strain characteristics of the explosion-proof material based on the device of claim 3 is characterized by comprising the following steps of:
step 1: measuring real-time oil pressure through an oil pressure sensor arranged on the wall of an oil tank of the converter transformer to obtain the oil pressure characteristic quantity of the real-time insulating oil; measuring the effective value of the current flowing through a network side winding of the converter transformer through a current transformer;
step 2: comparing whether the effective value of the current exceeds a preset current starting threshold value, if so, sending a starting signal to the strain monitoring unit and entering the step 3, otherwise, not sending the starting signal; judging whether the amplitude of the oil pressure characteristic quantity of the real-time insulating oil exceeds an oil pressure starting threshold value or not, if so, sending a starting signal to a strain monitoring unit and entering the step 3, otherwise, returning to the step 1;
and step 3: measuring the real-time strain characteristics of the porous metal explosion-proof layer through a strain sensor arranged in the porous metal explosion-proof unit to obtain real-time strain characteristic quantity; calculating comprehensive strain according to the real-time strain characteristic quantity;
and 4, step 4: judging whether the comprehensive strain exceeds a strain monitoring threshold value, if so, entering a step 5, otherwise, returning to the step 1;
and 5: and sending a strain alarm signal, and storing the transient oil pressure at the side wall of the transformer oil tank 500ms before and after the alarm, the transient current flowing through the net side winding and the transient strain data of the porous material.
9. The transformer state monitoring method based on explosion-proof material strain characteristics as claimed in claim 8, wherein the oil pressure starting threshold value psetComprises the following steps:
wherein, K1Is a first setting coefficient, K2Is the second setting coefficient, pmaxThe maximum value of the oil pressure at the side wall of the oil tank of the converter transformer under the excitation inrush current of the converter transformer is obtained.
10. The transformer state monitoring method based on the strain characteristics of the explosion-proof material as claimed in claim 8, wherein the comprehensive strain epsilon (t) is calculated by the following formula:
λ1+λ2+λ3＝1
wherein λ is1Is a first calibration factor, λ2As a second calibration factor, λ3Is a third calibration factor, ε1(t)，ε2(t)，ε3(t) and ε4(t) normal converter transformers respectivelyMeasuring strain value epsilon of four closed-cell foam metal layers on front, back, left and right side walls of an oil tank under operation5And (t) is a measured strain value of a closed-cell foam metal layer positioned on the top of the oil tank under the normal operation of the converter transformer.
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