CN111856166B - Detection method of box-type transformer and transformer - Google Patents
Detection method of box-type transformer and transformer Download PDFInfo
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- CN111856166B CN111856166B CN201910319160.5A CN201910319160A CN111856166B CN 111856166 B CN111856166 B CN 111856166B CN 201910319160 A CN201910319160 A CN 201910319160A CN 111856166 B CN111856166 B CN 111856166B
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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
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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
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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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Abstract
The invention provides a detection method of a box-type transformer and the transformer, wherein the detection method comprises the following steps: ST1: starting a detection program; ST2: judging whether the oil level state of the transformer room meets a preset state, if so, carrying out ST3 detection, and if not, judging that the box-type transformer fails; ST3: detecting environmental parameters of the box-type transformer, and judging whether triggering conditions for starting the fault detection module are met or not; ST4: detecting according to the fault detection module, and judging whether the transformer has faults or not; ST5: and performing transformer fault protection operation. According to the detection method of the box-type transformer, through setting the multi-level detection program, on one hand, the reliability of operation detection of the box-type transformer is ensured, and the situation that the normal operation of the transformer is secondarily damaged due to erroneous judgment of an incorrect operation instruction is avoided; meanwhile, continuous running of the fault detection program is avoided, and resources are wasted.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a detection method of a box-type transformer and the transformer.
Background
With the increasing and complicated scale of the power grid, the great improvement of the transmission capacity and the improvement of the voltage level, the power transmission efficiency is higher and higher, the investment of power grid equipment is higher and higher, the direct and indirect losses caused by sudden faults are larger and larger, and the problem of how to avoid and reduce the losses is quite remarkable. For this reason, the maintenance of the power grid equipment is gradually developed from accident maintenance to periodic maintenance, and further to reliability-based status maintenance.
The box transformer is a high-voltage switch device, a distribution transformer and a low-voltage distribution device, and the functions of high-voltage power receiving, transformer voltage reduction, low-voltage distribution and the like are organically combined together according to a certain wiring scheme, and the box transformer is installed in a moisture-proof, rust-proof, dust-proof, rat-proof, fire-proof, anti-theft, heat-insulating and totally-enclosed box body, and is mechanically and electrically integrated and operates in a totally-enclosed mode. The environmental parameters of the box-type transformer are mainly non-electric parameters of the box-type transformer, such as temperature, humidity, partial discharge and the like.
An oil-immersed transformer is generally adopted in a transformer chamber of a tank transformer, and a transformer core and windings are immersed in transformer oil, and a transformer body is cooled by the transformer oil. The body of the oil immersed transformer is arranged in an oil tank, and various factors such as oil quantity, temperature, humidity, air content and the like in the oil tank can influence the states of the iron core and the winding.
The method is influenced by factors such as insufficient level of related technology, limited cognition on failure mechanism of power grid equipment, insufficient identification on characteristic quantity and the like, and has a bad environment in power grid equipment operation, more variable factors and constraint conditions, so that how to detect the operation state of the transformer and judge and process failure expectation is a technical problem to be solved urgently by those skilled in the art. The detection method of the box-type transformer commonly used at present is to periodically overhaul in a certain period, collect shutdown data of various parameters, performance and running state of the transformer, then manually detect and process, and judge and control the state of the transformer according to the parameters, performance and running state. In the regular maintenance process, because the actual application condition of each transformer is not clear, a great deal of manpower and material resources are often spent on checking the transformers, and meanwhile, the maintenance of the power equipment is required to be stopped in a period of time. The detection method not only wastes resources, but also completely depends on man-made subjectivity for judging the detection data result, and objective judgment and fault expected judgment of the transformer cannot be achieved.
On the other hand, if the box-type transformer breaks down or misjudges that the box-type transformer breaks down, the normal operation of the transformer parts is influenced slightly, the normal operation of the whole power grid is influenced slightly, and the accuracy of the fault judgment of the box-type transformer and the rationality of the protection operation have great influence on the normal operation of the whole power grid.
In addition, the transformer, the high-voltage control equipment and the low-voltage control equipment in the existing box-type transformer are of an integral structure. When a part of the equipment cannot be maintained, only one whole equipment can be replaced, so that the resource waste is caused. In addition, in the maintenance process of the box-type transformer, the whole equipment is in a state of stopping working, and can work normally only after the equipment is maintained, and residents are in a long-time power failure state in the process, so that inconvenience is brought to life of the residents. The existing box-type transformer is usually installed in a hoisting mode, so that the installation difficulty is high, and the installation cost is high.
Disclosure of Invention
In view of the above, the present invention is directed to a method for detecting a box-type transformer and a transformer thereof, which solve at least one of the above problems.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the detection method of the box-type transformer comprises a base, three box bodies which can be mutually combined and spliced and fixed are arranged on the base, a low-voltage chamber, a transformer chamber and a high-voltage chamber are respectively and independently arranged in the three box bodies, the high-voltage chamber, the transformer chamber and the low-voltage chamber are all in a modularized design, the low-voltage chamber, the transformer chamber and the high-voltage chamber are electrically connected through cables, the transformer chamber comprises an oil tank and a transformer body, the transformer body is arranged in the oil tank, a top cover is arranged above the box bodies, a detection module, a communication module and a microprocessor are arranged on the top cover, the detection module detects detection information in the high-voltage chamber, the transformer chamber and the low-voltage chamber through a sensor unit, the microprocessor transmits the obtained detection information to a monitoring center through the communication module, data processing server equipment of the monitoring center stores and analyzes received data, and the corresponding detection method is executed according to preset instructions arranged in the monitoring center; the detection method comprises the following steps:
ST1: starting a detection program;
ST2: judging whether the oil level state of the transformer room meets a preset state, if so, carrying out ST3 detection, and if not, judging that the box-type transformer fails;
ST3: detecting environmental parameters of the box-type transformer, and judging whether triggering conditions for starting the fault detection module are met or not;
ST4: detecting according to the fault detection module, and judging whether the transformer has faults or not;
ST5: and performing transformer fault protection operation.
Further, in ST2, the following detection steps are included:
ST21: the pressure sensor arranged in the transformer chamber is started to detect the air pressure P at the top end of the transformer chamber a And the oil pressure P at the bottom end of the transformer chamber b The microprocessor transmits the collected pressure signals to a monitoring center;
ST22: estimating the initial average temperature T of transformer oil Oil 1 ；
ST23: calculating initial height H of transformer oil in transformer room 1 ；
ST24: starting an oil temperature detection counter, counting to be n, defining time of each estimated oil temperature change to be T, and defining T 1 ＝T Oil 1 ；
ST25: the counter is added with 1;
ST26: judging whether the counter reading n > A, wherein A is larger than 15; if yes, go to ST210; if not, go to ST27;
ST27: calculating the expansion volume V of transformer oil Expansion of Based on the expansion volume of the transformer and the volume of the transformer chamber, the average temperature T of the transformer oil is estimated again n ，T n The average value of the oil temperature after the nth oil temperature change time is the n which is a positive integer;
ST28: judging whether T is n -T (n-1) <Preset temperature threshold T 0 The method comprises the steps of carrying out a first treatment on the surface of the If yes, enterST210; if not, go to ST29;
ST29: definition (T) n +T (n-1) )/2＝T n Returning to ST25;
ST210: inquiring the oil density rho of the transformer at the moment 1 ；
ST211: calculating the oil level H at this time N ；
ST213: output oil level h=h N ；
ST214: determining whether or not the oil level H>Preset oil level threshold H 0 The method comprises the steps of carrying out a first treatment on the surface of the If yes, entering STR; if not, go to ST215;
ST215: entering ST3;
STR: the transformer fails, is shut down for protection, and prompts.
Further, in ST2, step ST212 is added after ST211, and the added ST212 is:
judging whether or not H N -H 1 <ΔH 0 If yes, ST213 is entered, and if no, ST29 is returned to.
Further, in ST3, the method includes the following detection steps:
ST31: detecting environmental parameters inside the box-type transformer, including at least the temperature T of the high-voltage electrified body, by means of a sensor High height Pulse number M of high-frequency partial discharge signal High height And pulse amplitude E High height ；
ST32: the detection data are sent to the monitoring center in a wired or wireless mode;
ST33: judging whether T is High height <T High 0 Or M High height <M High 0 And E is High height <E High 0 If yes, entering STR, if not, entering ST34;
ST34, the primary inspection is normal, and ST4 is entered;
STR, the transformer fails, the machine stops for protection and prompts.
Further, in ST4, the method includes the following detection steps:
ST41: obtaining the temperature parameter of the transformer, including the temperature value T of the transformer oil at the moment Measuring And the bus temperatureDegree value T Mother and mother ；
ST42: the detection data are sent to the monitoring center in a wired or wireless mode;
ST43: judging whether or not |T Measuring -T Mother and mother |>Delta T, if yes, entering STR; if not, go to ST47;
ST47: enter ST5;
STR: the transformer fails, is shut down for protection, and prompts.
Further, in ST4, the method includes the following detection steps:
ST41: obtaining the temperature parameter of the transformer, including the temperature value T of the transformer oil at the moment Measuring And a bus temperature value T Mother and mother ；
ST42: the detection data are sent to the monitoring center in a wired or wireless mode;
ST43: judging whether or not |T Measuring -T Mother and mother |>Delta T, if yes, entering STR; if not, go to ST44;
ST44: detecting a voltage signal and a current signal of the transformer;
ST45: processing the obtained voltage signal and current signal, and comparing the processed current value I and voltage value U with a preset current value I 0 And a voltage value U 0 Comparing;
ST46: judging whether or not I<I 0 And U<U 0 If yes, enter ST47, if not, enter STR;
ST47: enter ST5;
STR: the transformer fails, is shut down for protection, and prompts.
Further, in ST5, the method includes the following detection steps:
ST51: judging whether STR appears, if so, entering ST52; if not, entering STN;
ST52: the power supply module is started to provide 220V voltage for the transformer;
ST53: the fault detection circuit is started and comprises a voltage signal detection circuit and a current signal detection circuit which are respectively arranged in a high-voltage chamber, a transformer chamber and a low-voltage chamber;
ST54: judging whether the high-voltage chamber, the transformer chamber and the low-voltage chamber have faults, if yes, entering ST55, and if not, entering STN;
STN: the transformer is normal, and the detection program is finished;
ST55: judging whether the high-voltage chamber, the transformer chamber and the low-voltage chamber are in a single position or not, if so, entering into ST56; if not, go to ST57;
ST56: the monitoring center sends out a three-level alarm;
ST57: the component concentration detection module can circularly detect the concentration of each gas component and make each concentration value C i A limit value C corresponding to the gas component i0 Sequentially comparing;
ST58: the counter M performs counting operation;
ST59: judging whether M is greater than K, if so, entering ST510; if not, return to ST57;
ST510: detecting the absolute gas production rate V of the total hydrocarbon of the transformer by using a gas production rate detection module;
ST511: judging whether V is>V 0 If yes, go to ST513; if not, go to ST512;
ST512: the monitoring center sends out a secondary alarm;
ST513: the monitoring center sends out a primary alarm.
Further, in ST57, the cyclic detection of the concentration of each gas component is performed within a certain time range by using the component concentration detection module, and the detection period t of the component concentration detection module 1 Determine whether t 1 <t Threshold value If t 1 ≥t Threshold value If M is not greater than K, ST56 is entered.
Further, the detection method is carried out at intervals T Opening and closing After that, ST1 is entered to start the detection procedure, T at this time Opening and closing Is a preset fixed value.
Compared with the prior art, the detection method of the box-type transformer has the following advantages:
(1) According to the detection method of the box-type transformer, whether the box-type transformer is in a normal running state is judged according to the oil level state of the transformer room, the environmental parameters and the detection information of the fault detection module by setting the multi-level detection program, and the box-type transformer is only judged to be in a normal running state if the oil level state, the environmental parameters and the fault detection information all meet the preset condition range, otherwise, the corresponding protection program is executed, so that the reliability of running detection of the box-type transformer is ensured, and the situation that the normal running of the transformer is secondarily damaged due to wrong running instructions is avoided; meanwhile, continuous running of the fault detection program is avoided, and resources are wasted.
(2) According to the detection method of the box-type transformer, the power supply module is arranged to supply power to the fault detection circuit, so that the fault detection circuit is prevented from being started to damage the circuit when the transformer is abnormal, and the approximate position of the fault of the transformer is judged through the voltage information detection circuit and the current signal detection circuit of the high-voltage chamber, the transformer chamber and the low-voltage chamber respectively, so that the rapid repair or maintenance of workers is facilitated.
(3) By means of the secondary inspection judgment method, on one hand, the probability of misjudgment is avoided, on the other hand, the grade and the fault reason of the fault are classified, and the quick processing of staff is facilitated.
(4) The invention designs the modularized box-type transformer with the low-voltage chamber, the transformer chamber and the high-voltage chamber, which is convenient for a part of the modularized box-type transformer to maintain or repair without influencing the use of the whole box-type transformer, shortens the time, and only needs to replace part of the modularized box-type transformer when the modularized box-type transformer is replaced, thereby saving the cost.
Another object of the present invention is to propose a box transformer which is detected and maintained using the method of detecting a box transformer as described above.
The advantages of the box-type transformer and the detection method of the box-type transformer are the same as those of the prior art, and are not described in detail herein.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a flow chart of a method for detecting a box-type transformer according to an embodiment of the present invention;
FIG. 2 is a flowchart of ST2 in a method for detecting a box-type transformer according to an embodiment of the present invention;
FIG. 3 is a second flowchart of ST2 in the method for detecting a box transformer according to the embodiment of the present invention;
FIG. 4 is a flowchart of ST3 in the method for detecting the box-type transformer according to the embodiment of the present invention;
FIG. 5 is a flowchart of ST4 in the method for detecting a box-type transformer according to the embodiment of the present invention;
FIG. 6 is a second flowchart of ST4 in the method for detecting a box transformer according to the embodiment of the present invention;
FIG. 7 is a flowchart of ST5 in a method for detecting a box-type transformer according to an embodiment of the present invention;
fig. 8 is a flowchart of a detection method of a box transformer according to an embodiment of the present invention.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements that are expressly listed or inherent to such process, method, article, or apparatus, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus, based on implementation by one of ordinary skill in the art.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiment 1 of the invention discloses a detection method of a box-type transformer, wherein the box-type transformer comprises a high-voltage chamber, a transformer chamber and a low-voltage chamber, and the detection method comprises the following steps:
ST1: starting a detection program;
ST2: judging whether the oil level state of the transformer room meets a preset state, if so, carrying out ST3 detection, and if not, judging that the box-type transformer fails;
ST3: detecting environmental parameters of the box-type transformer, and judging whether triggering conditions for starting the fault detection module are met or not;
ST4: detecting according to the fault detection module, and judging whether the transformer has faults or not;
ST5: and performing transformer fault protection operation.
The box-type transformer comprises a base, three box bodies which can be mutually combined and spliced are arranged on the base, the three box bodies are respectively and independently arranged into a low-voltage chamber, a transformer chamber and a high-voltage chamber, the transformer chamber and the low-voltage chamber are all in modularized design, the low-voltage chamber, the transformer chamber and the high-voltage chamber are electrically connected through cables, the transformer chamber comprises an oil tank and a transformer body, the transformer body is arranged in the oil tank, a top cover is arranged above the box bodies, a detection module, a communication module and a microprocessor are arranged on the top cover, the detection module is used for detecting detection information in the high-voltage chamber, the transformer chamber and the low-voltage chamber through the sensor unit, the microprocessor is used for transmitting the obtained detection information to a monitoring center through the communication module, and a data processing server device of the monitoring center stores and analyzes received data, and a corresponding detection method is executed according to preset instructions arranged in the monitoring center.
This setting is through designing a low-voltage chamber, transformer room and high-voltage chamber modular box transformer, and the use of whole box transformer is not influenced when being convenient for wherein a part is maintained or is maintained, shortens time, and only need change wherein partial structure when taking place to change can, the saving cost. According to the detection method, whether the box-type transformer is in a normal running state is judged according to the oil level state of the transformer room, the environmental parameters and the detection information of the fault detection module by setting a multi-level detection program, and the box-type transformer is only judged to be in a normal running state if the oil level state, the environmental parameters and the fault detection information all meet the preset condition range, otherwise, a corresponding protection program is executed, so that the reliability of running detection of the box-type transformer is ensured, and the situation that the normal running of the transformer is secondarily damaged due to wrong running instructions given by misjudgment is avoided; meanwhile, continuous running of the fault detection program is avoided, and resources are wasted.
Example 2
As shown in fig. 2, in ST2, the following detection steps are included:
ST21: the pressure sensor arranged in the transformer chamber is started to detect the air pressure Pa at the top end of the transformer chamber and the oil pressure P at the bottom end of the transformer chamber b The microprocessor transmits the collected pressure signals to a monitoring center;
ST22: estimating the initial average temperature T of transformer oil Oil 1 ；
ST23: calculating initial height H of transformer oil in transformer room 1 ；
ST24: starting an oil temperature detection counter, counting to be n, defining time of each estimated oil temperature change to be T, and defining T 1 ＝T Oil 1 ；
ST25: the counter n is added with 1;
ST26: judging whether the counter reading n > A, wherein A is larger than 15; if yes, go to ST210; if not, go to ST27;
ST27: calculating the expansion volume V of transformer oil Expansion of Based on the expansion volume of the transformer and the volume of the transformer chamber, the average temperature T of the transformer oil is estimated again n ，T n The average value of the oil temperature after the nth oil temperature change time is the n which is a positive integer;
ST28: judging whether T is n -T (n-1) <Preset temperature threshold T 0 The method comprises the steps of carrying out a first treatment on the surface of the If yes, go to ST210; if not, go to ST29;
ST29: definition (T) n +T (n-1) )/2＝T n Returning to ST25;
ST210: inquiring the oil density rho of the transformer at the moment 1 ；
ST211: calculating the oil level H at this time N ；
ST213: output oil level h=h N ；
ST214: determining whether or not the oil level H>Preset oil level threshold H 0 The method comprises the steps of carrying out a first treatment on the surface of the If not, entering STR; if yes, go to ST215;
ST215: entering ST3;
STR: the transformer fails, is shut down for protection, and prompts.
In an example of the present invention, an initially estimated average temperature T is first used Oil 1 Pressure P at top of transformer chamber collected by pressure sensor a Oil pressure P at bottom end of transformer room b The difference value of the two is the pressure P of the transformer oil, P=ρgh is utilized by Pascal law, wherein ρ is the density of the transformer oil, g is the gravitational acceleration constant, H is the height, and the initial height H of the transformer oil in the transformer chamber is calculated 1 Then defining the time for re-estimating the oil temperature of the transformer to be t, wherein the value range of t is not more than 10s, preferably 5s>t>1s, starting an oil temperature detection counter, judging whether the reading of the oil temperature detection counter is larger than A, and judging whether A is larger than A>15, the measured pressure value changes along with the thermal expansion or contraction of the transformer oil and the corresponding oil level changes along with the dynamic operation of the thermal gradient in the transformer chamber, and the expansion volume V of the transformer oil is calculated Expansion of ，Wherein Z is the total weight of the transformer oil when the temperature of the transformer oil is 20 ℃, k is the expansion coefficient of the transformer oil, and the average temperature T of the transformer oil is estimated again n Judgment of T n And T is n-1 Is different from a preset temperature threshold T 0 For comparison, if T n -T (n-1) <Preset temperature threshold T 0 If not, then define (T n +T (n-1) )/2＝T n Then return to ST25 for iterative operation until the reading n of the oil temperature detection counter is greater than 10 or T n -T (n-1) <Preset temperature threshold T 0 Query for this T n Density ρ of transformer oil at temperature 1 Then calculate the oil level height H at this time N The oil level height H of the output transformer is H N Then through judging H and presetting the oil level threshold value H 0 In the relation of (1), if H>Preset oil level threshold H 0 ，H 0 And if the oil level in the hydraulic chamber is the lowest threshold value of the oil level height of the box-type transformer in the normal operation state, the oil level in the hydraulic chamber is normal, ST3 is entered for detection, and if the oil level in the hydraulic chamber is not the lowest threshold value, the box-type transformer is judged to be faulty.As some examples of the present invention, the estimated transformer oil temperature may be estimated by a formula, or may be averaged after being detected by a plurality of sensors.
In the embodiment, the collected pressure signal is used to collect the pressure P at the top end of the transformer room because the expansion and contraction ratios of the transformer oil in the transformer room are different at different heights a Oil pressure P at bottom end of transformer room b The difference value of the average temperature change after primary detection and multiple detection is within a preset threshold value range or the frequency of oil temperature detection reaches a preset threshold value as a judging condition, so that the accuracy of oil level position calculation is ensured to the greatest extent, the accuracy of oil level state judgment is further improved, misjudgment is avoided, and the accuracy and reliability of the detection method are improved.
Example 3:
as shown in fig. 3, in ST2, the following detection steps are included:
ST21: the pressure sensor arranged in the transformer chamber is started to detect the air pressure P at the top end of the transformer chamber a And the oil pressure P at the bottom end of the transformer chamber b The microprocessor transmits the collected pressure signals to a monitoring center;
ST22: estimating the initial average temperature T of transformer oil Oil 1 ；
ST23: calculating initial height H of transformer oil in transformer room 1 ；
ST24: starting an oil temperature detection counter, counting to be n, defining time of each estimated oil temperature change to be T, and defining T 1 ＝T Oil 1 ；
ST25: the counter n is added with 1;
ST26: judging whether the counter reading n > A, wherein A is larger than 15; if yes, go to ST210; if not, go to ST27;
ST27: calculating the expansion volume V of transformer oil Expansion of Based on the expansion volume of the transformer and the volume of the transformer chamber, the average temperature T of the transformer oil is estimated again n ，T n The average value of the oil temperature after the nth oil temperature change time is the n which is a positive integer;
ST28: judging whether T is n -T (n-1) <Preset temperature threshold T 0 The method comprises the steps of carrying out a first treatment on the surface of the If yes, go to ST210; if not, go to ST29;
ST29: definition (T) n +T (n-1) )/2＝T n Returning to ST25;
ST210: inquiring the oil density rho of the transformer at the moment 1 ；
ST211: calculating the oil level H at this time N ；
ST212: judging whether or not H N -H 1 <ΔH 0 If yes, go to ST213, if no, return to ST29;
ST213: output oil level h=h N ；
ST214: determining whether or not the oil level H>Preset oil level threshold H 0 The method comprises the steps of carrying out a first treatment on the surface of the If not, entering STR; if yes, go to ST215;
ST215: entering ST3;
STR: the transformer fails, is shut down for protection, and prompts.
In comparison with embodiment 2, the determination of ST212 is increased in the present embodiment, by determining the calculated oil level height H N And calculating the initial height H of transformer oil in transformer room 1 Whether the difference is within a predetermined height difference DeltaH 0 If not, the process returns to ST29 directly to perform iterative calculation again, the setting further avoids the error of the output oil level H when the estimated oil level height is within the accuracy range of the estimated oil level height calculated by the estimated average oil temperature, calculates the height and the oil amount by using the average value of two different temperatures based on the time t of estimating the oil temperature again, and repeats until the accuracy required by the result in this iterative process, thereby further improving the accuracy of the oil level state detection.
Example 4;
as shown in fig. 4, in ST3, the following detection steps are included:
ST31: detecting environmental parameters inside the box-type transformer, including at least the temperature of the high-voltage charged body, by means of a sensor Degree T High height Pulse number M of high-frequency partial discharge signal High height And pulse amplitude E High height ；
ST32: the detection data are sent to the monitoring center in a wired or wireless mode;
ST33: judging whether T is High height <T High 0 Or M High height <M High 0 And E is High height <E High 0 If yes, entering STR, if not, entering ST34;
ST34, the primary inspection is normal, and ST4 is entered;
STR, the transformer fails, the machine stops for protection and prompts.
The embodiment discloses a judging condition for judging whether to start a triggering condition of a fault detection module, by detecting the environmental parameters inside a box-type transformer, sending the environmental parameter information detected by a sensor to a monitoring center, processing, storing and analyzing the received information by a data processing server of the monitoring center, performing the next execution operation according to the preset judging condition, and by setting the step, ensuring the reliable detection of the normal operation of the box-type transformer and avoiding the abnormal state operation of the transformer, wherein T is as follows High 0 、M High 0 、E High 0 The maximum normal parameters of the box-type transformer under the model are prestored in a data processing server of the monitoring center.
As an example of the present invention, a Gao Pinluo Gaofesky partial discharge sensor is provided and installed at the three-phase cable ground of the box-type transformer for detecting and transmitting the pulse number M of the high-frequency partial discharge signal in the box-type transformer High height And pulse amplitude E High height The device comprises a passive wireless temperature sensor for measuring temperature through acoustic waves, a resonator arranged at the high-voltage side in a box-type transformer, and a transceiver arranged at the low-voltage side in the box-type transformer; the transceiver sends out an excitation signal to the resonator, and processes a response signal returned by the resonator to obtain temperature acquisition data corresponding to the resonance frequency of the response signal, so that the temperature T of the high-voltage charged body is obtained, and the temperature sensor does not need to be powered by a power supply at the high-voltage side, thereby solving the problems ofThe power supply difficulty of the sensor is solved, the high-voltage side and the low-voltage side are physically isolated, safety and reliability are realized, and the temperature of the high-voltage electrified body is detected.
Example 5:
as shown in fig. 5, in ST4, the following detection steps are included:
ST41: obtaining the temperature parameter of the transformer, including the temperature value T of the transformer oil at the moment Measuring And a bus temperature value T Mother and mother ；
ST42: the detection data are sent to the monitoring center in a wired or wireless mode;
ST43: judging whether or not |T Measuring -T Mother and mother |>Delta T, if yes, entering STR; if not, go to ST47;
ST47: enter ST5;
STR: the transformer fails, is shut down for protection, and prompts.
Through ST3 judgment, the environment parameters inside the box-type transformer are normal, a fault detection module is started to perform next fault detection, and the transformer oil temperature value T at the moment is obtained Measuring And a bus temperature value T Mother and mother The temperature T of the transformer oil at the moment Measuring Estimating the oil temperature T in ST2 by using Oil 1 Is obtained in the same way as for the bus temperature value T Mother and mother Obtained by detection of a temperature sensor, the monitoring center receives T Measuring And T Mother and mother Analysis and calculation are carried out, T is calculated Measuring And T is Mother and mother The absolute value of the difference value is compared with a preset delta T, wherein delta T is T of the box-type transformer in the normal state Measuring And T Mother and mother Maximum value of the difference.
Example 6:
as shown in fig. 6, in ST4, the following detection steps are included:
ST41: obtaining the temperature parameter of the transformer, including the temperature value T of the transformer oil at the moment Measuring And a bus temperature value T Mother and mother ；
ST42: the detection data are sent to the monitoring center in a wired or wireless mode;
ST43: judging whether or not |T Measuring -T Mother and mother |>Delta T, if yes, entering STR; if not, go to ST44;
ST44: detecting a voltage signal and a current signal of the transformer;
ST45: processing the obtained voltage signal and current signal, and comparing the processed current value I and voltage value U with a preset current value I 0 And a voltage value U 0 Comparing;
ST46: judging whether or not I<I 0 And U<U 0 If yes, enter ST47, if not, enter STR;
ST47: enter ST5;
STR: the transformer fails, is shut down for protection, and prompts.
Compared with embodiment 5, in the embodiment ST4, the judgment of the voltage signal and the current signal of the box-type transformer is added, the detected voltage signal and current signal are compared with the preset voltage signal and current signal, whether the detected voltage signal and current signal are within the preset range is judged, if yes, ST5 is entered, if the detected voltage signal and current signal are beyond the preset range, STR is entered, and the detected voltage signal and current signal are compared with the preset voltage signal and current signal, and the detected voltage signal and current signal are compared 0 、U 0 Is the maximum value of the normal operation of the box-type transformer of the model under normal environmental parameters and temperature parameters.
Preferably, according to some examples of the maximum invention, an arc sound detector is arranged in the transformer, arc sound signals are respectively acquired by the arc sound detectors arranged at a plurality of acquisition points, and the monitoring center performs information fusion processing on the received arc sound signals, current signals and voltage signals to further judge whether the transformer has faults.
Example 7:
as shown in fig. 7, in ST5, the following detection steps are included:
ST51: judging whether STR appears, if so, entering ST52; if not, entering STN;
ST52: the power supply module is started to provide 220V voltage for the transformer;
ST53: the fault detection circuit is started and comprises a voltage signal detection circuit and a current signal detection circuit which are respectively arranged in a high-voltage chamber, a transformer chamber and a low-voltage chamber;
ST54: judging whether the high-voltage chamber, the transformer chamber and the low-voltage chamber have faults, if yes, entering ST55, and if not, entering STN;
STN: the transformer is normal, and the detection program is finished;
ST55: judging whether the high-voltage chamber, the transformer chamber and the low-voltage chamber are in a single position or not, if so, entering into ST56; if not, go to ST57;
ST56: the monitoring center sends out a three-level alarm;
ST57: the component concentration detection module can circularly detect the concentration of each gas component and make each concentration value C i A limit value C corresponding to the gas component i0 Sequentially comparing;
ST58: the counter M performs counting operation;
ST59: judging whether M is greater than K, if so, entering ST510; if not, return to ST57;
ST510: detecting the absolute gas production rate V of the total hydrocarbon of the transformer by using a gas production rate detection module;
ST511: judging whether V is>V 0 If yes, go to ST513; if not, go to ST512;
ST512: the monitoring center sends out a secondary alarm;
ST513: the monitoring center sends out a primary alarm.
The oil immersed transformer is affected by mechanical stress, temperature, strong electric field, moisture, oxygen and other factors in the operation process, and insulating oil is subjected to carbonization, cracking, oxidation and other chemical reactions under the action of the factors to generate hydrogen, low-molecular hydrocarbon compounds, oil sludge, certain oxides and hydrocarbon polymers, which is the degradation and aging phenomenon of the insulating oil of the transformer. Under normal conditions, the insulating oil generates only a small amount of gases, and the content of the gases is usually kept within the national standard specified value. Once the oil immersed transformer has an internal latent fault, the energy released by the fault point accelerates the decomposition of insulating oil to produce gas, and the gas concentration may exceed a critical value. The source of the dissolved gas in the transformer oil is very complex, the oil immersed transformer can generate a small amount of gas under the action of electric and thermal stress under the normal operation condition, when the oil immersed transformer has internal latent faults, the energy released by the fault points can accelerate the decomposition of insulating materials to produce gas, and the gas concentration can possibly exceed the limit value, so that whether the state of the oil immersed transformer is normal can be roughly judged through the concentration of the gas, and the limit value of the concentration of the dissolved gas in the transformer oil is regulated as shown in the table.
| Gas composition | H 2 | CH 4 | C 2 H 2 | C 2 H 4 | C 2 H 6 |
| Preset limit value | C 10 | C 20 | C 30 | C 40 | C 50 |
| Examples of the examples | 180 | 65 | 12 | 70 | 35 |
In an example of the present invention, the detection module includes a component concentration detection module capable of cyclically detecting each gas component (H 2 ，CH 4 ，C 2 H 2 ，C 2 H 4 ，C 2 H 6 ) And each concentration value C i A limit value C corresponding to the gas component i0 C i0 (C 10 ，C 20 ，C 30 ，C 40 ，C 50 ) In each cycle of the detection, the counter M is operated as soon as the detected concentration of the gas component exceeds a limit value, and the absolute hydrocarbon production rate V, V by the gas production rate detection module is set as soon as the counter M is equal to or exceeds K (in general, M and K are integers, K is less than or equal to 5, preferably 3) 0 Is a threshold value for the absolute gas production rate of total hydrocarbons inside the transformer when a slight or medium-level fault occurs in the transformer.
In the invention, the gas concentration detected in each cycle is compared with the preset threshold value, and whether the times of the gas concentration exceeding the threshold value in each cycle exceeds the preset times is judged as a judging condition, so that on one hand, the continuous operation of a normal operation detection program of the transformer is avoided, the load is caused to the normal operation of the transformer, meanwhile, the continuous operation detection program and the detection module can aggravate the ageing of equipment, and the exceeding times are taken as judging basis, so that the single gas concentration exceeding standard caused by accidental attributes is avoided, and the judging accuracy is improved.
As an example of the present invention, in ST57, the cyclic detection of the concentration of each gas component can be performed within a certain time range using the component concentration detection module, the detection duration t of the component concentration detection module 1 Determine whether t 1 <t Threshold value ，t Threshold value For the user-defined writable time parameter, if t 1 ≥t Threshold value If M is not greater than K, ST56 is entered.
As an example of the invention, the monitoring center may be disposed on a box-type transformer, or may be disposed in a management center, where each box-type transformer corresponds to a numbered monitoring center, and the management center manages a plurality of transformers through a plurality of disposed monitoring centers, so that a background person can monitor and maintain the box-type transformer conveniently.
The invention realizes the detection of normal operation of the box-type transformer through the detection method of oil level state, environmental parameter and fault detection which are sequentially carried out, when a certain step is abnormal, STR is entered, otherwise, ST5 is entered, only the oil level state of the box-type transformer, the charged body temperature at the high-voltage side, the pulse number and the pulse amplitude of the high-frequency partial discharge signal, the oil temperature parameter of the transformer, the bus temperature parameter, the current signal and the voltage signal of the transformer are all in the normal operation range, the normal operation state of the transformer is judged, otherwise, the STR is entered, if STR is occurred, the power supply module is started, then the fault detection circuit which is electrically connected with the power supply module is started, if no abnormality occurs in the three box bodies, the normal state of the transformer is judged, otherwise, the abnormal state of the transformer is judged through the concentration and the speed of the generated gas in the transformer chamber, wherein the first-stage alarm is serious, the working personnel is required to immediately process the judgment, and the fault level is also convenient for the fast processing of the fault level is avoided by the method of the second judgment on the one hand.
As an example of the present invention, the detection method is described as a detection method at intervals T Opening and closing After that, ST1 is entered to start the detection procedure, T at this time Opening and closing Can be a preset fixed value, such as 30min, 50min, 100min, 200min, T Opening and closing The value range of (2) is 20-220 min; alternatively, the number of times STR occurs in ST2, ST3, ST4, ST5 in the detection program before the start of the present detection program is defined as λ, because the more times STR occursIn addition, the larger the probability of abnormality in the box-type transformer is, the shorter the time interval for entering the ST1 start-up detection program is, otherwise, the time interval for entering the ST1 start-up detection program for detection can be properly widened, and the applicant can obtain the time interval according to the past experience when T is Opening and closing The mathematical relationship with lambda satisfies the relationship T Opening and closing ＝0.068λ 2 And when 7.1λ+220, the detection method can achieve a good detection result, so that the waste of energy and resources is avoided, and the reliability of the normal operation of the box-type transformer is ensured.
In embodiment 8, as shown in fig. 8, the invention also discloses a detection method of the box-type transformer, which comprises the following detection steps:
s1: starting a detection program;
S2: the pressure sensor arranged in the transformer chamber is started to detect the air pressure P at the top end of the transformer chamber a And the oil pressure P at the bottom end of the transformer chamber b The microprocessor transmits the collected pressure signals to a monitoring center;
s3: estimating the initial average temperature T of transformer oil Oil 1 ；
S4: calculating initial height H of transformer oil in transformer room 1 ；
S5: starting an oil temperature detection counter, counting to be n, defining time of each estimated oil temperature change to be T, and defining T 1 ＝T Oil 1 ；
S6: the counter n is added with 1;
s7: judging whether the counter reading n > A, wherein A is larger than 15; if yes, go to S25; if not, entering S8;
s8: calculating the expansion volume V of transformer oil Expansion of Based on the expansion volume of the transformer and the volume of the transformer chamber, the average temperature T of the transformer oil is estimated again n ，T n The average value of the oil temperature after the nth oil temperature change time is the n which is a positive integer;
s9: judging whether T is n -T (n-1) <Preset temperature threshold T 0 The method comprises the steps of carrying out a first treatment on the surface of the If yes, enter S11; if not, entering S25;
s10: definition (T) n +T (n-1) )/2＝T n Returning to S6;
s11: inquiring the oil density rho of the transformer at the moment 1 ；
S12: calculating the oil level H at this time N ；
S13: judging whether or not H N -H 1 <ΔH 0 If yes, go to S14, if no, return to S10;
s14: output oil level h=h N ；
S15: determining whether or not the oil level H>Preset oil level threshold H 0 The method comprises the steps of carrying out a first treatment on the surface of the If not, entering S25; if yes, enter S16;
s16: detecting environmental parameters inside the box-type transformer, including at least the temperature T of the high-voltage electrified body, by means of a sensor High height Pulse number M of high-frequency partial discharge signal High height And pulse amplitude E High height ；
S17: the detection data send the environmental parameters to the monitoring center in a wired or wireless mode;
s18: judging whether T is High height <T The height of the glass fiber reinforced plastic material is 0, or M High height <M High 0 And E is High height <E High 0 If yes, go to S25, if not, go to S19;
s19: obtaining the temperature parameter of the transformer, including the temperature value T of the transformer oil at the moment Measuring And a bus temperature value T Mother and mother ；
S20: the detection data send the temperature parameters to a monitoring center in a wired or wireless mode;
s21: judging whether or not |T Measuring -T Mother and mother |>Δt, if yes, entering S25; if not, entering S22;
s22: detecting a voltage signal and a current signal of the transformer;
s23: processing the obtained voltage signal and current signal, and comparing the processed current value I and voltage value U with a preset current value I 0 And a voltage value U 0 Comparing;
s24: judging whether or not I<I 0 And U<U 0 If yes, entering SN, if not, entering S25;
S25: the power supply module is started to provide 220V voltage for the transformer;
s26: the fault detection circuit is started and comprises a voltage signal detection circuit and a current signal detection circuit which are respectively arranged in a high-voltage chamber, a transformer chamber and a low-voltage chamber;
s27: judging whether the high-voltage chamber, the transformer chamber and the low-voltage chamber have faults, if yes, entering ST28, and if not, entering SN;
SN, the transformer is normal, and the operation of the detection program is finished;
s28: judging whether the high-voltage chamber, the transformer chamber and the low-voltage chamber are in a single position or not, if so, entering into ST29; if not, go to ST30;
s29: the monitoring center sends out a three-level alarm;
s30: the component concentration detection module can circularly detect the concentration of each gas component and make each concentration value C i A limit value C corresponding to the gas component i0 Sequentially comparing;
s31: the counter M performs counting operation;
s32: judging whether M is greater than K, if so, entering S34; if not, entering S33;
s33: judging the detection time t of the component concentration detection module 1 >t Threshold value If yes, return to S29; if not, returning to S30;
s34: detecting the absolute gas production rate V of the total hydrocarbon of the transformer by using a gas production rate detection module;
S35: judging whether V is>V 0 If yes, go to S37; if not, entering S36;
s36: the monitoring center sends out a secondary alarm;
s37: the monitoring center sends out a primary alarm.
The invention also discloses a box-type transformer which is detected and maintained by adopting the detection method of any one of the box-type transformers.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (4)
1. The detection method of the box-type transformer is characterized in that the box-type transformer comprises a base, three box bodies which can be mutually combined and spliced and fixed are arranged on the base, a low-voltage chamber, a transformer chamber and a high-voltage chamber are respectively and independently arranged in the three box bodies, the high-voltage chamber, the transformer chamber and the low-voltage chamber are all in modularized design, the low-voltage chamber, the transformer chamber and the high-voltage chamber are electrically connected through cables, the transformer chamber comprises an oil tank and a transformer body, the transformer body is arranged in the oil tank, a top cover is arranged above the box bodies, a detection module, a communication module and a microprocessor are arranged on the top cover, the detection module detects detection information in the high-voltage chamber, the transformer chamber and the low-voltage chamber through a sensor unit, and is arranged at a three-phase cable grounding wire of the box-type transformer through a set Gao Pinluo Gaofesky partial discharge sensor so as to detect and send pulse times M of high-frequency partial discharge signals in the box-type transformer High height And pulse amplitude E High height The device comprises a passive wireless temperature sensor for measuring temperature through acoustic waves, a resonator arranged at the high-voltage side in a box-type transformer, and a transceiver arranged at the low-voltage side in the box-type transformer; the transceiver sends out an excitation signal to the resonator, and processes a response signal returned by the resonator to obtain temperature acquisition data corresponding to the resonance frequency of the response signal, thereby obtaining the temperature T of the high-voltage charged body High height The microprocessor transmits the obtained detection information to a monitoring center through a communication module, the data processing server equipment of the monitoring center stores and analyzes the received data, and a corresponding detection method is executed according to a preset instruction set in the monitoring center; the detection method comprises the following steps:
ST1: starting a detection program;
wherein the detection method is carried out at intervals T Opening and closing After that, ST1 is entered to start the detection procedure, T at this time Opening and closing Is a preset fixed value; alternatively, the number of times STR occurs in ST2, ST3, ST4, ST5 in the detection program before the start of the present detection program is defined as λ, T Opening and closing The mathematical relationship with lambda satisfies the relationship T Opening and closing ＝0.068λ 2 -7.1λ+220；
ST2: judging whether the oil level state of the transformer room meets a preset state, if so, carrying out ST3 detection, and if not, judging that the box-type transformer fails;
In ST2, the method includes the following detection steps:
ST21: the pressure sensor arranged in the transformer chamber is started to detect the air pressure P at the top end of the transformer chamber a And the oil pressure P at the bottom end of the transformer chamber b The microprocessor transmits the collected pressure signals to a monitoring center;
ST22: estimating the initial average temperature T of transformer oil Oil 1 ；
ST23: calculating initial height H of transformer oil in transformer room 1 ；
ST24: starting an oil temperature detection counter, counting to be n, defining time of each estimated oil temperature change to be T, and defining T 1 ＝T Oil 1 ；
ST25: the counter is added with 1;
ST26: judging whether the counter reading n > A, wherein A is larger than 15; if yes, go to ST210; if not, go to ST27;
ST27: calculating the expansion volume V of transformer oil Expansion of Based on the expansion volume of the transformer and the volume of the transformer chamber, the average temperature T of the transformer oil is estimated again n ，T n The average value of the oil temperature after the nth oil temperature change time is the n which is a positive integer;
ST28: judging whether T is n -T (n-1) <Preset temperature threshold T 0 The method comprises the steps of carrying out a first treatment on the surface of the If yes, go to ST210; if not, go to ST29;
ST29: definition (T) n +T (n-1) )/2＝T n Returning to ST25;
ST210: inquiring the oil density rho of the transformer at the moment 1 ；
ST211: calculating the oil level H at this time N ；
ST213: output oil level h=h N ；
ST214: determining whether or not the oil level H>Preset oil level threshold H 0 The method comprises the steps of carrying out a first treatment on the surface of the If yes, entering STR; if not, go to ST215;
ST215: entering ST3;
ST3: detecting environmental parameters of the box-type transformer, and judging whether triggering conditions for starting the fault detection module are met or not;
in ST3, the method includes the following detection steps:
ST31: detecting environmental parameters inside the box-type transformer, including at least the temperature T of the high-voltage electrified body, by means of a sensor High height Pulse number M of high-frequency partial discharge signal High height And pulse amplitude E High height ；
ST32: the detection data are sent to the monitoring center in a wired or wireless mode;
ST33: judging whether T is High height <T High 0 Or M High height <M High 0 And E is High height <E High 0 If yes, entering STR, if not, entering ST34;
wherein T is High 0 、M High 0 、E High 0 The method comprises the steps of pre-storing maximum normal parameters of the box-type transformer under the model in a data processing server of a monitoring center;
ST34, the primary inspection is normal, and ST4 is entered;
ST4: detecting according to the fault detection module, and judging whether the transformer has faults or not;
in ST4, the method includes the following detection steps:
ST41: obtaining the temperature parameter of the transformer, including the temperature value T of the transformer oil at the moment Measuring And a bus temperature value T Mother and mother ；
ST42: the detection data are sent to the monitoring center in a wired or wireless mode;
ST43: judging whether or not |T Measuring -T Mother and mother |>Delta T, if yes, entering STR; if not, go to ST47;
wherein DeltaT is T of the type of box-type transformer in a normal state Measuring And T Mother and mother The maximum value of the difference;
ST47: enter ST5;
STR: the transformer fails, stops for protection and prompts;
ST5: performing transformer fault protection operation;
in ST5, the method includes the following detection steps:
ST51: judging whether STR appears, if so, entering ST52; if not, entering STN;
ST52: the power supply module is started to provide 220V voltage for the transformer;
ST53: the fault detection circuit is started and comprises a voltage signal detection circuit and a current signal detection circuit which are respectively arranged in a high-voltage chamber, a transformer chamber and a low-voltage chamber;
ST54: judging whether the high-voltage chamber, the transformer chamber and the low-voltage chamber have faults, if yes, entering ST55, and if not, entering STN;
STN: the transformer is normal, and the detection program is finished;
ST55: judging whether the high-voltage chamber, the transformer chamber and the low-voltage chamber are in a single position or not, if so, entering into ST56; if not, go to ST57;
ST56: the monitoring center sends out a three-level alarm;
ST57: the component concentration detection module can circularly detect the concentration of each gas component and make each concentration value C i A limit value C corresponding to the gas component i0 Sequentially comparing;
ST58: the counter M performs counting operation;
ST59: judging whether M is greater than K, if so, entering ST510; if not, return to ST57;
wherein K is a preset integer, and K is less than or equal to 5;
ST510: detecting the absolute gas production rate V of the total hydrocarbon of the transformer by using a gas production rate detection module;
ST511: judging whether V is>V 0 If yes, go to ST513; if not, go to ST512;
wherein V is 0 A threshold value for absolute gas production rate of total hydrocarbons inside the transformer when a slight or medium-level fault occurs in the transformer;
ST512: the monitoring center sends out a secondary alarm;
ST513: the monitoring center sends out a primary alarm.
2. The method of claim 1, wherein in ST2, step ST212 is added after ST211, and the added ST212 is:
judging whether or not H N -H 1 <ΔH 0 If yes, go to ST213, if no, return to ST29;
wherein DeltaH 0 Is a preset height difference value.
3. The method of claim 1, wherein in ST4, when judging |t Measuring -T Mother and mother When the I is less than or equal to delta T, entering ST44;
ST44: detecting a voltage signal and a current signal of the transformer;
ST45: processing the obtained voltage signal and current signal, and comparing the processed current value I and voltage value U with a preset current value I 0 And a voltage value U 0 Comparing;
ST46: judging whether or not I<I 0 And U<U 0 If yes, enter ST47, if not, enter STR;
ST47: ST5 is entered.
4. The method of detecting a tank transformer according to claim 1, wherein in ST57, the cyclic detection of the concentration of each gas component using the component concentration detection module is performed within a certain time range, and the detection period t of the component concentration detection module 1 Determine whether t 1 <t Threshold value If t 1 ≥t Threshold value If M is not greater than K, ST56 is entered.
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| 基于油色谱分析的变压器故障诊断与应用;谢荣斌;薛静;张霖;申峻;李琪菡;雷勇;赵莉华;;广东电力(第08期);全文 * |
| 色谱分析在变压器故障诊断和维护中的应用;钟亢;;昆明冶金高等专科学校学报(第03期);全文 * |
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