CN114446598A - Converter transformer protection device and method based on strain characteristics of explosion-proof material - Google Patents
Converter transformer protection device and method based on strain characteristics of explosion-proof material Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 75
- 239000011148 porous material Substances 0.000 claims abstract description 6
- 239000006260 foam Substances 0.000 claims description 12
- 230000001052 transient effect Effects 0.000 claims description 9
- 239000012528 membrane Substances 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 4
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- 230000000694 effects Effects 0.000 abstract description 2
- 238000009421 internal insulation Methods 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 7
- 238000004880 explosion Methods 0.000 description 5
- 239000007769 metal material Substances 0.000 description 5
- 230000035772 mutation Effects 0.000 description 5
- 230000001419 dependent effect Effects 0.000 description 4
- 239000006262 metallic foam Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- FBOUIAKEJMZPQG-AWNIVKPZSA-N (1E)-1-(2,4-dichlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)pent-1-en-3-ol Chemical compound C1=NC=NN1/C(C(O)C(C)(C)C)=C/C1=CC=C(Cl)C=C1Cl FBOUIAKEJMZPQG-AWNIVKPZSA-N 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/404—Protective devices specially adapted for fluid filled transformers
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Abstract
The converter transformer protection device and method based on the strain characteristics of the explosion-proof material comprise an oil pressure starting unit, a strain protection unit, a trip unit and a porous metal explosion-proof unit capable of absorbing energy; the porous metal explosion-proof unit and the tripping unit are connected with the strain protection unit, the strain protection unit is connected with the oil pressure starting unit, and the oil pressure starting unit is arranged on the wall of the converter transformer box. According to the invention, whether the internal insulation oil pressure strong characteristic quantity and the porous material strain characteristic quantity of the converter transformer reach threshold values or not is judged by using the oil pressure starting unit and the strain protection unit, so that the state change of the converter transformer can be discriminated quickly and reliably, and internal faults can be eliminated. Meanwhile, the porous explosion-proof unit is used for absorbing fault energy, so that the pressure intensity of insulating oil is effectively reduced, the strain of the tank wall is reduced, the deformation degree of the converter transformer is reduced, and the effect of improving the explosion-proof performance of the converter transformer is achieved.
Description
Technical Field
The invention belongs to the technical field of non-electric quantity protection of converter transformers of power systems, and particularly relates to a converter transformer protection device and method based on strain characteristics of an explosion-proof material.
Background
The transformer is an important device in a power system and is provided with non-electric quantity protection such as differential protection, current quick-break protection, overcurrent protection, overload protection, zero-sequence current protection, overexcitation protection and the like, and gas protection and the like. Compared with the electric quantity protection, the non-electric quantity protection not only makes up the deficiency of the electric quantity protection by virtue of the sensitivity advantage, but also is widely applied to a power system, and the existing thinking of relay protection research is widened.
On one hand, the electric quantity protection is to discriminate the fault through a protection criterion and rapidly remove the fault by sending a tripping action signal after the fault occurs so as to avoid further damage of power equipment or further impact of a system. However, the electrical quantity protection has inherent time limit due to fault discrimination and fault removal, and the transformer fault is often evolved to fire and explosion accidents within the inherent time limit.
On the other hand, since the last 20 s of the century, transformer gas protection based on oil flow rate and gas generation was invented to protect various types of internal faults outside the electrical sensitive area, according to the specific construction and fault characteristics of the transformer. The gas protection relies on the correct action of the gas relay. The gas relay widely used at present is still the basic principle and the mechanical structure of the Buchholz relay for one hundred years, but the traditional gas relay threshold value determination only depends on experience and lacks theoretical guidance and support, and as non-electric quantity protection is not widely concerned by the industry for a long time, the performance of the gas relay is difficult to meet the requirement, and the correct action rate is also at a lower level. The main transformer is frequently subjected to gas protection misoperation tripping and pressure release valve oil injection accidents due to external short circuit impact of the transformer, and the safety operation of a power grid is greatly influenced.
In summary, in view of the complex physical environment and phenomena of transformer faults, a relay protection method capable of quickly and reliably discriminating and removing converter transformer faults is urgently needed, and meanwhile, the relay protection method can help the converter transformer resist fault evolution within the inherent time limit of protecting and removing faults, protect the converter transformer and avoid explosion and fire accidents.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a converter transformer protection apparatus and method based on the strain characteristics of an explosion-proof material, which can improve the mechanical performance and the explosion-proof performance of a converter transformer, and implement fault discrimination and removal of the converter transformer, protect the converter transformer, and improve the operational reliability 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 converter transformer protection device based on the strain characteristics of the explosion-proof material comprises an oil pressure starting unit, a strain protection unit, a tripping unit and a porous metal explosion-proof unit capable of absorbing energy;
the porous metal explosion-proof unit and the tripping unit are connected with the strain protection unit, the strain protection unit is connected with the oil pressure starting unit, and the oil pressure starting unit is arranged on the wall of the converter transformer box.
Furthermore, the porous metal explosion-proof unit is arranged on the inner side of the converter transformer, and the insulating oil pressure sensor is connected with the inner wall of the converter transformer.
Further, the porous metal explosion-proof unit comprises a porous metal explosion-proof membrane, and the porous metal explosion-proof membrane comprises a front panel, a rear panel and a plurality of closed-cell foam metal layers arranged between the front panel and the rear panel.
Further, the strain protection unit comprises a strain sensor, a strain amplifier and a second judgment element; the strain sensor is connected with the strain amplifier, and the strain amplifier is connected with the second judgment element; the porous metal explosion-proof unit, the tripping unit and the oil pressure starting unit are all connected with the second judgment element.
Further, strain sensors are arranged between adjacent closed cell foam metal layers; the sampling frequency of the strain sensor is 20 kHz.
Furthermore, the density of the closed-cell foam metal layer is distributed from large to small from the insulating oil to the inner wall of the converter transformer.
Further, the closed-cell metal foam layer comprises a first porous metal layer and a second porous metal layer, and the density of the first porous metal layer is 0.54g/cm3The density of the second porous metal layer is 0.27g/cm3。
Further, the oil pressure starting unit comprises an insulated oil pressure sensor and a first judgment element which are connected; the insulating oil pressure sensor is arranged on the inner wall of the converter transformer and is in contact with the insulating oil.
A protection method of a converter transformer protection device based on strain characteristics of an explosion-proof material comprises the following steps:
step 1: measuring real-time oil pressure through an insulating oil pressure sensor arranged on the inner wall of the converter transformer to obtain the characteristic quantity of the real-time pressure of the insulating oil;
step 2: judging whether the strong characteristic quantity of the converter transformer insulation oil pressure exceeds an oil pressure starting threshold value or not, if so, entering a step 3, otherwise, returning to the step 1;
and step 3: measuring the real-time strain characteristic of the porous metal explosion-proof layer to obtain a real-time strain characteristic quantity;
and 4, step 4: judging whether the real-time strain characteristic quantity exceeds a strain protection threshold value, if so, entering a step 5, otherwise, returning to the step 1;
and 5: and sending a strain trip signal, and simultaneously storing the transient oil pressure of the insulating oil and the transient strain data of the porous material for 500ms before and after tripping.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the porous metal explosion-proof unit arranged in the converter transformer is used for absorbing internal fault energy, the insulating oil pressure is reduced, the integral bearing limit of the converter transformer is improved, and the explosion-proof performance of the converter transformer is improved. 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 porous metal layers is utilized to quickly sense the strain characteristic quantity under the internal fault of the converter transformer, and 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.
According to the invention, whether the internal insulation oil pressure strength characteristic quantity and the porous material strain characteristic quantity of the converter transformer reach threshold values or not is judged by using the oil pressure starting unit and the strain protection unit, so that the state change of the converter transformer is quickly and reliably discriminated, and internal faults are eliminated. Meanwhile, the porous explosion-proof unit is used for absorbing fault energy, so that the pressure intensity of insulating oil is effectively reduced, the strain of the tank wall is reduced, the deformation degree of the converter transformer is reduced, and the effect of improving the explosion-proof performance of the converter transformer is achieved.
Drawings
Fig. 1 is a schematic diagram of a converter transformer protection 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 flow chart of a converter transformer protection method based on strain characteristics of an explosion-proof material.
FIG. 4 is a graph showing the measured strain characteristics of the porous metal material according to the present invention.
Fig. 5 is a graph of measured insulating oil pressure in accordance with the present invention.
In the figure, 1 is a porous metal explosion-proof unit, 2 is a strain protection unit, 3 is a trip unit, 4 is an oil pressure starting unit, 5 is a tap changer, 6 is a porous metal explosion-proof membrane, 7 is a converter transformer, 8 is a front panel, 9 is a rear panel, 10 is a first porous metal layer, 11 is a second porous metal layer, and 12 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 converter transformer protection device based on the strain characteristics of the explosion-proof material comprises a porous metal explosion-proof unit 1, an oil pressure starting unit 4, a strain protection unit 2 and a trip unit 3. Wherein the tap changer 5 is an important component of the converter transformer.
The porous metal explosion-proof unit 1 and the trip unit 3 are both connected with the strain protection unit 2, the strain protection unit 2 is connected with the oil pressure starting unit 4, and the oil pressure starting unit 4 is installed on the wall of a converter transformer box.
Referring to fig. 2, the porous metal explosion proof unit 1 comprises a porous metal explosion proof membrane 6, the porous metal explosion proof membrane 6 comprising a front panel 8, a rear panel 9, and a number of closed cell metal foam layers arranged between the front panel 8 and the rear panel 9. The closed-cell foam metal layers are different in density, and the density is determined by the oil pressure fluctuation characteristics of the converter transformer under internal faults. And calculating and selecting the density of each layer of closed-cell foam metal according to the oil pressure amplitude and the closed-cell metal yield strength, wherein the porous metal layer with high density is close to the insulating oil, and the porous metal layer with low density is close to the wall of the converter transformer 7.
The porous metal explosion-proof unit 1 is arranged on the inner side of the converter transformer 7, and the porous metal explosion-proof unit 1 is tightly connected with the wall surface of the converter transformer 7. The first porous metal layer 10 is close to the insulating oil and the second porous metal layer 11 is close to the wall of the converter transformer 7.
The oil pressure starting unit 4 includes an insulating oil pressure sensor and a first judgment element.
The strain protection unit 2 comprises a strain sensor 12, a strain amplifier and a second decision element. Wherein the strain sensor 12 and the second judging element are both connected to the strain amplifier, and the second judging element is also connected to the first judging element of the oil pressure starting unit 4. After the second judgment element receives a signal sent by the first judgment element in the oil pressure starting unit 4, the strain sensor 12 measures a strain characteristic quantity in real time, the strain characteristic quantity is amplified by the strain amplifier and then is input into the second judgment element, the amplitude of the strain characteristic quantity is compared with a preset protection threshold value through the second judgment element, and if the amplitude exceeds the protection threshold value, the second judgment element sends the signal to the trip unit 3; otherwise, the second determination element does not send a signal and continues to wait for a signal from the first determination element of the oil pressure activation unit 4. The sampling frequency of the strain sensor 12 is 20 kHz.
The insulating oil pressure sensor is located on the wall of the converter transformer tank, the insulating oil pressure sensor is in direct contact with the insulating oil, and the first judgment element of the insulating oil pressure sensor is connected. The oil pressure starting unit 4 directly measures the insulation oil pressure through a pressure sensor, compares the amplitude of the measurement result with a set starting threshold value through a first judgment element, if the amplitude exceeds the starting threshold value, the oil pressure starting unit is considered to reach a starting state, and sends a signal to a second judgment element of the strain protection unit 2; otherwise, the starting state is not reached, and the pressure of the insulating oil is continuously measured. Threshold value P for oil pressure startingsetThe following settings are set:
wherein, PmaxThe maximum value of the oil pressure of the converter transformer under the normal operation,
and taking 1.5 as the first setting coefficient. KerrIs the error coefficient.
The porous metal explosion-proof unit 1 and the trip unit 3 are both connected with the first judgment element.
Discrete data of converter transformer oil tank strain characteristic quantity epsilon (t) within one window length through dynamic sliding window algorithmFault identification and recording real-time data to obtain discrete sequence epsilon1、ε2…εN。
Assume that the current time is t and the window length is N.
Calculating the mean of discrete sequences
The accumulated sum S is calculated by adding the difference between the current value and the average value to the previous sumi. Namely, it is
Wherein S0Taking the cumulative sum S as 0iThe largest three items in the three items are marked as Sm1、Sm2、Sm3And calculating the root mean square value Sm；
After receiving the signal sent by the oil pressure starting unit 4, the strain protection unit 2 calculates the root mean square value S of the current timemJudging the strain epsilon (t) mutation quantity of the surface of the converter transformer oil tank, and if the strain epsilon (t) mutation quantity meets the strain mutation protection criterion Sm(t)≥SsetI.e. the root mean square value S of the porous metal strain characteristic quantity epsilon (t) of the inner wall of the converter transformer oil tankmGreater than or equal to converter transformer strain protection action setting value SsetThe strain protection unit sends a trip signal to the trip unit 3.
Wherein, the converter transformer strain protection action setting value SsetMaximum value S of deformation strain of surface of oil tank of converter transformer according to maximum load operation of converter transformermaxSetting:
Sset＝Kre1 Smax
in the formula, Kre1For the sliding window first reliability factor, 1.2 is taken.
And after receiving the signal sent by the strain protection starting unit 2, the strain sudden change monitoring unit judges whether the surface strain epsilon (t) of the oil tank of the converter transformer is obviously increased, and the converter transformer correspondingly performs protection action according to the judgment result.
Specifically, if the strain mutation protection criterion S is metm(t)≥SsetThe strain protection unit 2 further distinguishes between an external short-circuit fault or an internal fault of the converter transformer. Under the external fault, the porous metal strain characteristic quantity of the inner wall of the converter transformer box body is positively correlated with the through current in the external fault, and the larger the fault through current is, the larger the dependent variable is. Therefore, the strain protection with the braking characteristic is adopted, and the action strain amount epsilonsetAccording to the amount of brake strain epsilonresMethod of automatic adjustment, i.e. maximum setting epsilonset.maxComprises the following steps:
wherein epsilonres.maxThe dependent variable under the most serious external fault,
to set the reliability factor, 1.3 is taken. The setting value is too low, which easily causes protection misoperation, so the braking strain epsilonresBrake strain amount less than or equal to minimum value of set strain amount
While setting the minimum value epsilon of the dependent variableset.minComprises the following steps:
wherein,
for the reliability factor, take 1.5, εu.maxThe maximum strain value of the foam metal layer is the maximum strain value of the foam metal layer under the normal operation of the converter transformer. Thus, the mathematical expression for the braking characteristic is:
in the formula, epsilonset.rFor strain protection threshold, epsilonset.minIs the minimum value of the dependent variable, epsilonresFor braking strain amount, epsilonres.gThe brake strain amount corresponding to the minimum value of the strain amount.
The braking characteristic slope K is:
and after receiving the signal sent by the strain protection unit 2, the trip unit 3 sends a trip signal and stores transient strain data of the converter transformer box body.
The strain sensors 12 are disposed between adjacent closed cell metal foam layers for measuring the strain characteristics of the cellular metal material.
Preferably, the closed-cell metal foam layer is two layers, namely a first porous metal layer 10 and a second porous metal layer 11, and the metal density of the first porous metal layer 10 is greater than that of the second porous metal layer 11. Specifically, the first porous metal layer 10 has a density of 0.54g/cm3The density of the second porous metal layer 11 is 0.27g/cm3. A strain sensor 12 is disposed between the first porous metal layer 10 and the second porous metal layer 11.
And the trip unit 3 sends a trip signal and stores transient oil pressure and porous explosion-proof transient strain data after receiving the signal sent by the strain protection unit 2.
Referring to fig. 3, the converter transformer protection method based on the strain characteristics of the explosion-proof material comprises the following steps:
step 1: after the device is electrified and started, reading a preset oil pressure starting threshold value PsetAnd strain protection threshold epsilonset.r
Step 2: measuring real-time oil pressure through an insulating oil pressure sensor arranged on the wall surface of the converter transformer, quickly sensing real-time change of the oil pressure, and reading the real-time pressure characteristic quantity P (t) of the insulating oil;
and step 3: whether the strong characteristic quantity P (t) of the converter transformer insulation oil pressure exceeds the oil pressure starting threshold value P or not is judged through a first judgment element of the oil pressure starting unitsetIf the oil pressure exceeds the oil pressure threshold value, the starting state is considered to be reached, and the step 4 is carried out, otherwise, the starting state is considered not to be reached, and the step 2 is carried out again; the interference influence of external faults and the like on the single strain characteristic quantity is avoided, and the reliability of the converter transformer protection is improved.
And 4, step 4: the strain sensor arranged between the porous foam metal layers is used for measuring the strain characteristics of the porous metal, so that the strain characteristic quantity under the internal fault of the converter transformer is indirectly and 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 is avoided, and the accuracy of protection judgment and the reliability of protection of the converter transformer are improved. Reading a real-time strain characteristic quantity epsilon (t) of the porous material; if the strain mutation protection criterion S is metm(t)≥SsetEntering step 5; otherwise, returning to the step 2;
and 5: judging whether the real-time strain characteristic quantity epsilon (t) amplitude of the porous metal explosion-proof layer exceeds a strain protection threshold value epsilon or not through a second judgment element of the strain protection unitset.rIf the strain protection threshold value is exceeded, entering the step 6, otherwise, returning to the step 2;
step 6: and sending a strain trip signal through a trip unit, and simultaneously storing the transient oil pressure of the insulating oil and the transient strain data of the porous material for 500ms before and after tripping, so that the whole device is reset.
The density of the first porous metal layer 10 is 0.54g/cm in response to the internal arc fault of the converter transformer3The density of the second porous metal layer 11 is 0.27g/cm3。
Fig. 4 and 5 are measured results of the converter transformer integrated protection device based on the strain characteristics of the metal material. As can be seen from the figures 4 and 5, the pressure intensity of the insulating oil in the oil tank and the strain of the porous metal material in the porous explosion-proof unit can be measured by the insulating oil pressure intensity sensor and the strain sensor.
The invention organically combines and reasonably collocates the porous metal explosion-proof unit, the oil pressure starting unit, the strain protection unit, the trip unit and the like, so that the whole protection device and method have simple structure, easy realization and high sensitivity.
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 (9)
1. The converter transformer protection device based on the strain characteristics of the explosion-proof material is characterized by comprising an oil pressure starting unit (4), a strain protection unit (2), a trip unit (3) and a porous metal explosion-proof unit (1) capable of absorbing energy;
the porous metal explosion-proof unit (1) and the trip unit (3) are connected with the strain protection unit (2), the strain protection unit (2) is connected with the oil pressure starting unit (4), and the oil pressure starting unit (4) is installed on the wall of the converter transformer box.
2. The converter transformer protection device based on the strain characteristics of the explosion-proof material as claimed in claim 1, wherein the porous metal explosion-proof unit (1) is arranged inside the converter transformer (7) and is connected with the inner wall of the converter transformer (7).
3. The converter transformer protection device based on the strain characteristic of the explosion-proof material is characterized in that the porous metal explosion-proof unit (1) comprises a porous metal explosion-proof membrane (6), and the porous metal explosion-proof membrane (6) comprises a front panel (8), a rear panel (9) and a plurality of closed-cell foam metal layers arranged between the front panel (8) and the rear panel (9).
4. The converter transformer protection device based on the strain characteristic of the explosion-proof material is characterized in that the strain protection unit (2) comprises a strain sensor (12), a strain amplifier and a second judgment element; wherein the strain sensor (12) is connected with a strain amplifier, and the strain amplifier is connected with the second judgment element; the porous metal explosion-proof unit (1), the trip unit (3) and the oil pressure starting unit (4) are connected with the second judgment element.
5. The converter transformer protection device based on the strain characteristics of the explosion-proof material as claimed in claim 4, wherein the strain sensor (12) is arranged between adjacent closed-cell foam metal layers; the sampling frequency of the strain sensor (12) is 20 kHz.
6. The converter transformer protection device based on the strain characteristics of the explosion-proof material as recited in claim 1, wherein the density of the closed-cell foam metal layer is distributed from large to small from the insulating oil to the inner wall of the converter transformer (7).
7. The converter transformer protection device based on the strain characteristics of the explosion-proof material as recited in claim 1 or 6, wherein the closed-cell foam metal layer comprises a first porous metal layer (10) and a second porous metal layer (11), and the density of the first porous metal layer (10) is 0.54g/cm3The density of the second porous metal layer (11) is 0.27g/cm3。
8. The converter transformer protection device based on the strain characteristics of the explosion-proof material is characterized in that the oil pressure starting unit (4) comprises an insulated oil pressure sensor and a first judgment element which are connected; the insulating oil pressure intensity sensor is arranged on the inner wall of the converter transformer (7) and is in contact with the insulating oil.
9. A protection method of a converter transformer protection device based on strain characteristics of an explosion-proof material is characterized by comprising the following steps:
step 1: measuring real-time oil pressure through an insulating oil pressure sensor arranged on the inner wall of the converter transformer to obtain the characteristic quantity of the real-time pressure of the insulating oil;
step 2: judging whether the strong characteristic quantity of the converter transformer insulation oil pressure exceeds an oil pressure starting threshold value or not, if so, entering a step 3, otherwise, returning to the step 1;
and step 3: measuring the real-time strain characteristic of the porous metal explosion-proof layer to obtain a real-time strain characteristic quantity;
and 4, step 4: judging whether the real-time strain characteristic quantity exceeds a strain protection threshold value, if so, entering a step 5, otherwise, returning to the step 1;
and 5: and sending a strain trip signal, and simultaneously storing the transient oil pressure of the insulating oil and the transient strain data of the porous material for 500ms before and after tripping.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114460497A (en) * | 2021-12-31 | 2022-05-10 | 西安交通大学 | Transformer state monitoring and protection integrated device and method based on strain characteristics |
| CN114509705A (en) * | 2021-12-31 | 2022-05-17 | 西安交通大学 | Transformer state monitoring device and method based on strain characteristics of explosion-proof material |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114460497B (en) * | 2021-12-31 | 2024-07-16 | 西安交通大学 | Transformer state monitoring and protecting integrated device and method based on strain characteristics |
| CN114509705B (en) * | 2021-12-31 | 2024-07-16 | 西安交通大学 | Transformer state monitoring device and method based on strain characteristics of explosion-proof material |
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