CN115621019B - Multifunctional monitoring platform and monitoring method for vacuum oil injection of transformer - Google Patents
Multifunctional monitoring platform and monitoring method for vacuum oil injection of transformer Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 373
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000002347 injection Methods 0.000 title claims abstract description 28
- 239000007924 injection Substances 0.000 title claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 74
- 238000004458 analytical method Methods 0.000 claims description 27
- 238000011156 evaluation Methods 0.000 claims description 13
- 238000012937 correction Methods 0.000 claims description 9
- 239000004973 liquid crystal related substance Substances 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 3
- 238000005457 optimization Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 8
- 239000003921 oil Substances 0.000 description 85
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 7
- 238000012360 testing method Methods 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
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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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- 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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- General Physics & Mathematics (AREA)
- Debugging And Monitoring (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The multifunctional monitoring platform for transformer vacuum oil injection and the monitoring method thereof perform liquid level monitoring task, namely, when the transformer oil tank is injected with oil, the radar liquid level meter receives the liquid level of the transformer oil tank and transmits the liquid level to the controller, and the controller transmits the liquid level of the transformer oil tank to the monitoring terminal for displaying so as to achieve the purpose of monitoring; the accuracy of the liquid level value of the transformer oil tank obtained by executing the liquid level monitoring task is more than 90%, the accuracy is high, and the on-site maintenance performance and the vacuum oil injection reliability are improved. Executing a pressure monitoring task, namely when a vacuumizing stage is executed on the transformer oil tank, the piezoresistive pressure sensor is used for collecting the pressure of the transformer oil tank and transmitting the pressure to the controller, and the controller is used for transmitting the pressure of the transformer oil tank to a monitoring terminal for displaying so as to achieve the purpose of monitoring; the accuracy of the pressure value of the transformer oil tank obtained by executing the pressure monitoring task is more than 90%, the accuracy is high, and the on-site maintenance performance and the vacuum oil injection reliability are improved.
Description
Technical Field
The invention relates to the technical field of transformer vacuum oil injection monitoring, in particular to a transformer vacuum oil injection multifunctional monitoring platform and a monitoring method.
Background
In order to ensure the quality of the transformer which is newly arrived at the factory, the transformer is inspected in a hanging cover or the replacement of the transformer, the safe and reliable operation is ensured after the transformer is put into operation, the transformer is usually vacuumized for a certain time before oiling, the gas and the water in the oil tank are evaporated and pumped out of the oil tank under normal temperature and high vacuum degree, so as to reduce the gas content in the transformer and ensure the dryness of insulation, and then the transformer is oiled by a vacuum oil filter under the vacuum state, and the process is called vacuum oiling.
According to the specification GBJ148-90, namely the power transformer, the oil immersed reactor and the mutual inductor monitoring and acceptance criterion for electric device installation monitoring task, the specification 2.7.3 states that the transformer and the reactor of 220kV and above must be subjected to vacuum oil injection, and 110kV is preferably subjected to vacuum oil injection. According to the power transformer overhaul guide rules DL/T573-2010 requirement: and (3) stopping oiling when the oil is injected into the transformer to the top of the tank by 200-300 mm at the speed of 3-5 t/h, and continuously vacuumizing for more than 4 h.
That is, during vacuum oil filling of a transformer, that is, during vacuum oil filling of a transformer oil tank, monitoring of pressure and liquid level in the transformer oil tank is required, but during vacuum oil filling of the transformer oil tank, a pointer type vacuum gauge is adopted in a vacuum pumping stage of the transformer oil tank to manually monitor the pressure in the transformer oil tank, and a manual visual liquid level monitoring mode is adopted in an oil filling stage of the transformer oil tank, so that the monitoring accuracy of the pressure and liquid level in the transformer oil tank is below 70%, and the accuracy is too low to improve on-site maintenance performance and vacuum oil filling reliability.
The method is characterized in that a task achievement duration is preset during a monitoring task when the pressure and the liquid level of the transformer tank are monitored, however, the monitoring task performance is often delayed due to the fact that a plurality of accidents are caused during the monitoring task when the pressure and the liquid level of the transformer tank are monitored, and the operation flow of the monitoring task is generally arranged in advance.
Disclosure of Invention
In order to solve the defects existing in the prior art, the invention aims to provide a multifunctional transformer vacuum oil injection monitoring platform and a monitoring method, wherein the accuracy of a liquid level value of a transformer oil tank obtained by performing a liquid level monitoring task is more than 90%, the accuracy is high, and the on-site overhaul performance and the vacuum oil injection reliability are improved; the accuracy of the pressure value of the transformer oil tank obtained by executing the pressure monitoring task is more than 90%, the accuracy is high, and the on-site maintenance performance and the vacuum oil injection reliability are improved.
The invention adopts the following technical scheme.
A transformer vacuum oiling multifunctional monitoring platform, comprising:
a radar liquid level gauge is arranged at the top in the transformer oil tank;
the radar liquid level gauge is electrically connected with a controller arranged outside the transformer oil tank and is used for collecting the liquid level of the transformer oil tank;
the controller is connected with the WIFI module, and the controller is wirelessly connected with a monitoring terminal in the WLAN through the WIFI module.
Preferably, the multifunctional monitoring platform for vacuum oil injection of the transformer further comprises:
the system comprises a monitoring value acquisition unit, a monitoring value treatment unit, a deduction unit, a task cutting unit and a prompt unit which are operated on a monitoring terminal;
the monitoring value acquisition unit is used for collecting the monitoring value containing liquid level or pressure, and transmitting the collected monitoring value to the monitoring value treatment unit, the monitoring value treatment unit is used for executing treatment on the collected monitoring value, the deduction unit is used for executing operation and analysis on the treated monitoring value and transmitting analysis value signals to the prompting unit, the prompting unit comprises a loudspeaker and a liquid crystal screen which are connected with the monitoring terminal, the loudspeaker is used for executing voice broadcasting on the collected analysis value, the liquid crystal screen is used for executing display on the analysis value of the deduction unit, the task cutting unit is used for cutting the monitoring task containing the pressure monitoring task or the liquid level monitoring task into more than one task domain, each group of task domains is cut into more than one subtask group, the external memory of the monitoring terminal is used for backing up the monitoring value, the information backed up by the external memory of the monitoring terminal contains the monitoring value reached by the monitoring task and the monitoring value which is still monitored at present, and the monitoring task information after the treatment is transmitted to the deduction unit by the monitoring value according to the task cutting unit.
Preferably, the controller is also electrically connected with a piezoresistive pressure sensor arranged at the top in the transformer oil tank.
A multifunctional monitoring method for vacuum oil injection of a transformer comprises the following steps:
and executing a liquid level monitoring task, namely when the oil tank of the transformer is filled with oil, the radar liquid level meter receives the liquid level of the transformer oil tank and transmits the liquid level to the controller, and the controller transmits the liquid level of the transformer oil tank to the monitoring terminal for displaying so as to achieve the purpose of monitoring.
Preferably, the multifunctional monitoring method for vacuum oil injection of the transformer further comprises the following steps:
and executing a pressure monitoring task, namely when the vacuumizing stage is executed on the transformer oil tank, the piezoresistive pressure sensor is used for collecting the pressure of the transformer oil tank and transmitting the pressure to the controller, and the controller is used for transmitting the pressure of the transformer oil tank to the monitoring terminal for displaying so as to achieve the purpose of monitoring.
Preferably, the method of monitoring value handling by the monitoring value handling unit comprises:
step 1-1, performing orderly arrangement according to the received monitoring value and the front-back sequence of the receiving time points;
and step 1-2, embedding the execution phase condition of the monitoring task in the execution period of the monitoring task corresponding to the monitoring value into the corresponding period, and obtaining the corresponding period message of the monitoring task.
Preferably, the task cutting unit is used for monitoring the task cutting task domain, and comprises the following steps: cutting in the time interval of the monitoring task, and the method of the task cutting unit cutting the task domain includes carrying out cutting according to the monitoring execution flow;
the deduction unit is used for calculating and analyzing the treated monitoring value, and the deduction unit is used for calculating the treated monitoring value based on the monitoring value of the monitoring task module for cutting the task domain of the monitoring task and backing up the external memory of the monitoring terminal, and comprises the following steps:
step 2-1, according to the task cutting unit, comparing the time length achieved by the first task domain in the monitoring task and the time length achieved by the first task domain in the monitoring task being executed with the time length achieved by the first task domain in the monitoring task being executed in a random way, wherein the time length is similar to the external memory of the monitoring terminal, and the operation time period correction factor A is calculated according to the operation equation: a= { B c1 -B d }÷B c Here B c1 Time consuming achievement of first task domain for monitoring task being executed, B d The time length reached by the first task domain in the monitoring task is reached;
step 2-2, calculating the estimated amount of time length achieved by the secondary task domain of the monitoring task being executed according to the time period correction factor obtained in step 1-1 and the achieved time length of the secondary task domain of the achieved monitoring task, wherein the operation equation is B k2 ＝B d2 X {1+A }, here B d2 Is the achievement duration of the next task domain of the achieved monitoring task, B k2 An estimated amount of time achieved by the next task domain of the monitoring task being performed;
step 2-3, waiting until the completion time of the secondary task domain of the executing monitoring task and the completion time of the secondary task domain of the executing monitoring task are evaluated, and calculating an adjustment factor, wherein the operation equation is q= { B c2 -B k2 }÷B c2 Here B c2 The time duration reached by the next task domain of the monitoring task being executed;
step 2-4, calculating the estimated amount of time length reached by the residual task domain of the monitoring task being executed according to the adjustment factor obtained in step 2-3 and the reached time length of the residual task domain of the achieved monitoring task, wherein the operation equation is B kc ＝B dx X {1+q }, the x-valued interval in the equation is a positive integer of more than three, and n is the order code of the task domain.
Preferably, the method of deriving unit analysis of the post-treatment monitoring values comprises:
step 3-1, obtaining the time length reached by the task domain of the monitoring task being executed, obtaining the evaluation value of the task domain of the monitoring task being executed according to the operation, and subtracting the evaluation value from the time length to obtain the interval value;
step 3-2, if the interval is lower than zero, according to the execution stage condition of the task domain of the monitoring task being executed and the task domain execution stage condition of the monitoring task being executed, which is similar to the task domain execution stage condition of the monitoring task being executed, the reason that the interval is lower than zero is determined, and the reason is transmitted to a prompt unit to prompt and backup in the external memory of the monitoring terminal;
and 3-3, if the interval is higher than zero, according to the ratio of the time length of each execution of more than one subtask group of the task domain of the monitoring task being executed in the total time length of the execution of the task domain to which the subtask group belongs, analyzing the three subtask groups with the highest ratio, identifying the reason that the interval is higher than zero, and transmitting the reason to a prompt unit for prompt.
Preferably, the prompting unit prompts the progress of the monitoring task to be accelerated to prevent hysteresis by prompting that the time length achieved by the task domain of the monitoring task being executed in the analysis value is higher than the evaluation value through a loudspeaker;
after the external memory of the monitoring terminal receives the reason of the high evaluation of the time length achieved by the task domain of the executing monitoring task, the situation of the execution stage forming the reason is backed up, which is beneficial to the subsequent application, so that the optimization of the task monitoring task construction step is enhanced, the new method for enhancing the task progress can be directly used by the subsequent development of the new monitoring task, and the achievement performance of the task is continuously enhanced along with the number of task achievement.
Preferably, the multifunctional monitoring method for vacuum oil injection of the transformer further comprises the following steps:
step 4-1, collecting the monitoring value, and executing treatment and cutting task fields on the monitoring value according to the corresponding time period;
step 4-2, performing operation analysis on the treated monitoring value and the achieved monitoring task which is similar to the monitoring task, and deducing the duration of the residual task domain of the monitoring task;
step 4-3, according to the continuous execution of the monitoring task, performing comparison analysis on the task domain achievement time length of the monitoring task and the deduced task domain time length;
and 4-4, prompting and backing up the parsed value.
Compared with the prior art, the radar liquid level meter has the beneficial effects that the radar liquid level meter performs a liquid level monitoring task, namely, when the oil tank of the transformer is filled with oil, the radar liquid level meter receives the liquid level of the oil tank of the transformer and transmits the liquid level to the controller, and the controller transmits the liquid level of the oil tank of the transformer to the monitoring terminal for displaying so as to achieve the purpose of monitoring; the accuracy of the liquid level value of the transformer oil tank obtained by executing the liquid level monitoring task is more than 90%, the accuracy is high, and the on-site overhaul performance and the vacuum oil injection reliability are improved. Executing a pressure monitoring task, namely when a vacuumizing stage is executed on the transformer oil tank, the piezoresistive pressure sensor is used for collecting the pressure of the transformer oil tank and transmitting the pressure to the controller, and the controller is used for transmitting the pressure of the transformer oil tank to the monitoring terminal for displaying so as to achieve the purpose of monitoring; the accuracy of the pressure value of the transformer oil tank obtained by executing the pressure monitoring task is more than 90%, the accuracy is high, and the on-site maintenance performance and the vacuum oil injection reliability are improved.
Drawings
FIG. 1 is a flow chart of steps 1-1 to 1-2 of the present invention;
FIG. 2 is a flow chart of steps 3-1 to 3-3 of the present invention;
FIG. 3 is a flow chart of steps 4-1 to 4-4 in the present invention
Detailed description of the preferred embodiments
The present application is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present invention and are not intended to limit the scope of protection of the present application.
The invention relates to a transformer vacuum oiling multifunctional monitoring platform, which comprises:
a radar liquid level gauge is arranged at the top in the transformer oil tank;
the radar liquid level gauge is electrically connected with a controller arranged outside the transformer oil tank and is used for collecting the liquid level of the transformer oil tank; the controller can be a single chip microcomputer, a microprocessor, an FPGA chip or a DSP chip.
The controller is connected with the WIFI module, and the controller is wirelessly connected with a monitoring terminal in the WLAN through the WIFI module. The monitoring terminal can be a computer or a smart phone.
In particular, the radar level gauge belongs to a universal radar level gauge, which is based on a measuring instrument of a time travel principle, radar waves run at the speed of light, and the running time can be converted into a material level signal through electronic components. The probe emits high frequency pulses that propagate in space at the speed of light, and when the pulses encounter the surface of the material, they are reflected back to be picked up by a pickup in the meter and convert the distance signal into a level signal.
In a preferred but non-limiting embodiment of the invention, the control unit is also electrically connected to a piezoresistive pressure sensor provided in the upper part of the transformer tank.
Specifically, the piezoresistive pressure sensor is constructed using the piezoresistive effect of single crystal silicon. A monocrystalline silicon wafer is used as an elastic element, a group of equivalent resistors are diffused in a specific direction of monocrystalline silicon on a monocrystalline silicon membrane by utilizing the process of an integrated circuit, the resistors are connected into a bridge, and the monocrystalline silicon wafer is placed in a sensor cavity. When pressure changes, the monocrystalline silicon forms strain, so that the strain resistance directly diffused on the monocrystalline silicon forms a change in direct proportion to the measured pressure, and a corresponding voltage output signal is obtained by a bridge circuit.
The invention relates to a multifunctional monitoring method for vacuum oil injection of a transformer, which comprises the following steps:
and executing a liquid level monitoring task, namely when the oil tank of the transformer is filled with oil, the radar liquid level meter receives the liquid level of the transformer oil tank and transmits the liquid level to the controller, and the controller transmits the liquid level of the transformer oil tank to the monitoring terminal for displaying so as to achieve the purpose of monitoring.
Specifically, the liquid level accuracy test for the liquid level monitoring task of the present invention is as follows:
and (3) performing a liquid level monitoring task 50 times at the position that the oil level of the transformer oil tank reaches the liquid level of 250mm, and obtaining the liquid level value displayed on the monitoring terminal in the table 1:
TABLE 1
From table 1:
wherein x is i In order to execute the liquid level value after the ith liquid level monitoring task, i is a positive integer, and n is 50 test analyses: average measurement of 50 trials251.214mm and standard deviation s of 1.517.
Therefore, the accuracy of the liquid level value of the transformer oil tank obtained by executing the liquid level monitoring task is more than 90%, the accuracy is high, and the on-site maintenance performance and the vacuum oil injection reliability are improved.
In a preferred but non-limiting implementation of the present invention, the method for monitoring the vacuum oil injection of a transformer comprises:
and executing a pressure monitoring task, namely when the vacuumizing stage is executed on the transformer oil tank, the piezoresistive pressure sensor is used for collecting the pressure of the transformer oil tank and transmitting the pressure to the controller, and the controller is used for transmitting the pressure of the transformer oil tank to the monitoring terminal for displaying so as to achieve the purpose of monitoring.
Specifically, the pressure accuracy test for the liquid level pressure task of the present invention is as follows:
when the pressure in the transformer oil tank reaches the set value of 1MPa, performing a pressure monitoring task for 50 times to obtain the pressure value displayed on the monitoring terminal in Table 2:
TABLE 2
From table 2:
average value:
mean error
Standard deviation:wherein x is i To perform the pressure value after the ith pressure monitoring task, i is a positive integer and n is 50 test analyses: the average pressure difference of 50 times of tests is 1.00322MPa, and the average error is 0.322 percent and less than or equal to 0.5 percent.
Therefore, the accuracy of the pressure value of the transformer oil tank obtained by executing the pressure monitoring task is more than 90%, the accuracy is high, and the on-site maintenance performance and the vacuum oil injection reliability are improved.
Compared with the prior art, the radar liquid level meter has the beneficial effects that the radar liquid level meter performs a liquid level monitoring task, namely, when the oil tank of the transformer is filled with oil, the radar liquid level meter receives the liquid level of the oil tank of the transformer and transmits the liquid level to the controller, and the controller transmits the liquid level of the oil tank of the transformer to the monitoring terminal for displaying so as to achieve the purpose of monitoring; the accuracy of the liquid level value of the transformer oil tank obtained by executing the liquid level monitoring task is more than 90%, the accuracy is high, and the on-site overhaul performance and the vacuum oil injection reliability are improved. Executing a pressure monitoring task, namely when a vacuumizing stage is executed on the transformer oil tank, the piezoresistive pressure sensor is used for collecting the pressure of the transformer oil tank and transmitting the pressure to the controller, and the controller is used for transmitting the pressure of the transformer oil tank to the monitoring terminal for displaying so as to achieve the purpose of monitoring; the accuracy of the pressure value of the transformer oil tank obtained by executing the pressure monitoring task is more than 90%, the accuracy is high, and the on-site maintenance performance and the vacuum oil injection reliability are improved.
In a preferred but non-limiting implementation of the present invention, the transformer vacuum oiling multifunctional monitoring platform further comprises:
the system comprises a monitoring value acquisition unit, a monitoring value treatment unit, a deduction unit, a task cutting unit and a prompt unit which are operated on a monitoring terminal;
the monitoring value acquisition unit is used for collecting the monitoring value containing liquid level or pressure, and transmitting the collected monitoring value to the monitoring value treatment unit, the monitoring value treatment unit is used for executing treatment on the collected monitoring value, the deduction unit is used for executing operation and analysis on the treated monitoring value and transmitting analysis value signals to the prompting unit, the prompting unit comprises a loudspeaker and a liquid crystal screen which are connected with the monitoring terminal, the loudspeaker is used for executing voice broadcasting on the collected analysis value, the liquid crystal screen is used for executing display on the analysis value of the deduction unit, the task cutting unit is used for cutting the monitoring task containing the pressure monitoring task or the liquid level monitoring task into more than one task domain, each group of task domains is cut into more than one subtask group, the external memory of the monitoring terminal is used for backing up the monitoring value, the information backed up by the external memory of the monitoring terminal contains the monitoring value reached by the monitoring task and the monitoring value which is still monitored at present, and the monitoring task information after the treatment is transmitted to the deduction unit by the monitoring value according to the task cutting unit.
In a preferred but non-limiting implementation of the present invention, as shown in fig. 1, the method for handling the monitored value by the monitored value handling unit includes:
step 1-1, performing orderly arrangement according to the received monitoring value and the front-back sequence of the receiving time points;
and step 1-2, embedding the execution phase condition of the monitoring task in the execution period of the monitoring task corresponding to the monitoring value into the corresponding period, and obtaining the corresponding period message of the monitoring task.
In a preferred but non-limiting embodiment of the present invention, a method for monitoring a task cutting task domain by a task cutting unit includes: cutting in the time period of the monitoring task, wherein the method for cutting the task domain by the task cutting unit comprises the steps of executing cutting according to the monitoring execution flow, and the cutting is just like executing cutting on the pressure monitoring task, so that the task domain for executing pressure monitoring in the corresponding time period of each pre-planned stage of vacuumizing can be cut; the task domain for performing the liquid level monitoring at the corresponding time period of each of the pre-planned phases when the oil is injected can be cut by performing the cutting for the liquid level monitoring task.
In a preferred but non-limiting implementation method of the present invention, when the deduction unit performs operation and analysis on the monitored value after treatment, the deduction unit performs operation on the monitored value after treatment based on the monitored value of the monitoring task module for cutting the task domain of the monitoring task and the external memory of the monitoring terminal, and the method includes:
step 2-1, according to the task cutting unit, comparing the time length achieved by the first task domain in the monitoring task and the time length achieved by the first task domain in the monitoring task being executed with the time length achieved by the first task domain in the monitoring task being executed in a random way, wherein the time length is similar to the external memory of the monitoring terminal, and the operation time period correction factor A is calculated according to the operation equation: a= { B c1 -B d }÷B c Here B c1 Time consuming achievement of first task domain for monitoring task being executed, B d The time length reached by the first task domain in the monitoring task is reached;
step 2-2, calculating the estimated amount of time length achieved by the secondary task domain of the monitoring task being executed according to the time period correction factor obtained in step 1-1 and the achieved time length of the secondary task domain of the achieved monitoring task, wherein the operation equation is B k2 ＝B d2 X {1+A }, here B d2 Is the achievement duration of the next task domain of the achieved monitoring task, B k2 Is the monitoring task being performedAn estimated amount of time length achieved by the next task domain;
step 2-3, waiting until the completion time of the secondary task domain of the executing monitoring task and the completion time of the secondary task domain of the executing monitoring task are evaluated, and calculating an adjustment factor, wherein the operation equation is q= { B c2 -B k2 }÷B c2 Here B c2 The time duration reached by the next task domain of the monitoring task being executed;
step 2-4, calculating the estimated amount of time length reached by the residual task domain of the monitoring task being executed according to the adjustment factor obtained in step 2-3 and the reached time length of the residual task domain of the achieved monitoring task, wherein the operation equation is B kc ＝B dx X {1+q }, the x-valued interval in the equation is a positive integer of more than three, and n is the order code of the task domain.
The time required by the second task domain is deduced by comparing the time length of the first task domain of the achieved monitoring task with the time length of the first task domain of the currently executed monitoring task to a time period correction factor, then an adjustment factor is calculated by the time length of the second task domain, and the time length of the residual task domain of the currently executed monitoring task is calculated by the adjustment factor and the time length of the residual task domain of the achieved monitoring task to evaluate the time length of the residual task domain of the currently executed monitoring task, so that the deduced time length of the monitoring task is more accurate.
In a preferred but non-limiting embodiment of the present invention, as shown in fig. 2, the method for analyzing the monitored value after treatment by the deriving unit includes:
step 3-1, obtaining the time length reached by the task domain of the monitoring task being executed, obtaining the evaluation value of the task domain of the monitoring task being executed according to the operation, and subtracting the evaluation value from the time length to obtain the interval value;
step 3-2, if the interval is lower than zero, according to the execution stage condition of the task domain of the monitoring task being executed and the task domain execution stage condition of the monitoring task being executed, which is similar to the task domain execution stage condition of the monitoring task being executed, the reason that the interval is lower than zero is determined, and the reason is transmitted to a prompt unit to prompt and backup in the external memory of the monitoring terminal;
and 3-3, if the interval is higher than zero, according to the ratio of the time length of each execution of more than one subtask group of the task domain of the monitoring task being executed in the total time length of the execution of the task domain to which the subtask group belongs, analyzing the three subtask groups with the highest ratio, identifying the reason that the interval is higher than zero, and transmitting the reason to a prompt unit for prompt.
In detail, the method of performing parsing on the three sub-task groups with the highest duty ratio in step 3-3 is to identify the progress of the monitoring task at each stage in the duration of execution of the sub-task group.
Here, by comparing the achievement duration deduced from the achievement duration of the monitoring task domain, when the achievement duration of the monitoring task domain is smaller, the reason acting on the monitoring process can be identified by analyzing the monitoring method, the monitoring function and the monitoring condition of the monitoring task domain, and the reason can also be used as the identification of the acceleration monitoring process, and the method used as the acceleration monitoring function can be used for monitoring the inner diameter directly after the detection.
In addition, by continuously gathering and accelerating the conditions of the monitoring process, the method for monitoring is improved continuously during the execution of the following monitoring task, so that the following monitoring task is executed more and more efficiently, and the method for monitoring the execution of the task is improved continuously.
In a preferred but non-limiting implementation method of the present invention, the prompt unit receives the prompt of the time period reached by the task domain of the monitoring task being executed within the analysis value, and prompts the speed-up task progress prevention hysteresis by prompting through a loudspeaker.
Here, in the process of executing analysis on the subtask group with small contrast interval, the progress of task pushing is monitored at each time point of accident in the time of the subtask group, the subtask group is enabled to reach a long time by accident effect, the delay formed by equipment problems except accidents is not regarded as a key reason of prompt, and executable workers can identify whether improvement is possible or not, so that the task can be authenticated in the task domain, and the task is ensured to reach accuracy.
In the preferred but non-limiting implementation method of the invention, after the external memory of the monitoring terminal receives the reason of the high evaluation of the time length achieved by the task domain of the monitoring task being executed, the situation of the execution stage forming the reason is backed up, which is beneficial to the subsequent application, so that the optimization of the task monitoring task construction step is improved, the method for improving the task progress can be directly used by the subsequent development of new monitoring tasks, and the task achievement performance is continuously improved along with the number of task achievement.
In a preferred but non-limiting embodiment of the present invention, the method for monitoring the vacuum oil injection of a transformer comprises:
step 4-1, collecting the monitoring value, and executing treatment and cutting task fields on the monitoring value according to the corresponding time period;
step 4-2, performing operation analysis on the treated monitoring value and the achieved monitoring task which is similar to the monitoring task, and deducing the duration of the residual task domain of the monitoring task;
step 4-3, according to the continuous execution of the monitoring task, performing comparison analysis on the task domain achievement time length of the monitoring task and the deduced task domain time length;
and 4-4, prompting and backing up the parsed value.
In short, the collected monitoring value is converted into the corresponding period consumption of the monitoring task through the monitoring value disposal unit, the execution flow and period connection in the monitoring task are more firmly and more convenient to analyze, in addition, the monitoring task being executed is cut into a plurality of task domains through the task cutting unit, then the estimated time length of the monitoring task being executed and the estimated time length of the residual task domain being executed are calculated through the calculation unit according to the random time length of the first task domain being achieved in the monitoring task and the time length of the first task domain being executed, which are similar to the external memory of the monitoring terminal, of the first task domain being executed, the period correction factor is calculated, the time length of the last task domain being achieved of the monitoring task is calculated through the period correction factor, then the adjustment factor is calculated according to the real time length of the last task domain of the monitoring task, the estimated time length of the monitoring task being executed and the residual task domain being achieved is calculated through the adjustment factor, the time length of the monitoring task being deduced is more accurate, the usability is stronger, and the time length of all tasks after the monitoring task is directly deduced after the monitoring task is achieved 2 is completed, and the time length of the monitoring task is directly taken; the synchronous achievement time length deduced through the achievement time length of the monitoring task domain is compared, the achievement time length deduced through the achievement time length of the monitoring task domain is compared, when the achievement time length of the monitoring task domain is smaller, the reason acting on the monitoring process can be identified through analysis of the monitoring method, the monitoring function and the monitoring condition of the monitoring task domain, the reason can also be used as the identification of the acceleration monitoring process, and the method used as the acceleration monitoring function can be used for monitoring the inner diameter directly after; in addition, the condition of the monitoring process is continuously gathered and accelerated, so that the continuous improvement of the monitoring method during the execution of the subsequent monitoring task is facilitated, the subsequent monitoring task is executed more and more efficiently, the method for monitoring the execution of the task is also improved continuously, the time of the monitoring task domain is higher than the reason of the evaluation duration through monitoring and analyzing, and the prompt unit prompts the monitoring task domain, so that the delay of the subsequent monitoring task domain can be effectively prevented, and the achievement of all monitoring task energy points is ensured.
While the applicant has described and illustrated the embodiments of the present invention in detail with reference to the drawings, it should be understood by those skilled in the art that the above embodiments are only preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not to limit the scope of the present invention, but any improvements or modifications based on the spirit of the present invention should fall within the scope of the present invention.
Claims (4)
1. The utility model provides a multi-functional monitoring method of transformer vacuum oiling which characterized in that includes:
executing a liquid level monitoring task, namely when the oil tank of the transformer is filled with oil, the radar liquid level meter receives the liquid level of the oil tank of the transformer and transmits the liquid level to the controller, and the controller transmits the liquid level of the oil tank of the transformer to the monitoring terminal for displaying so as to achieve the purpose of monitoring;
the multifunctional monitoring method for the vacuum oiling of the transformer further comprises the following steps:
executing a pressure monitoring task, namely when a vacuumizing stage is executed on the transformer oil tank, the piezoresistive pressure sensor is used for collecting the pressure of the transformer oil tank and transmitting the pressure to the controller, and the controller is used for transmitting the pressure of the transformer oil tank to a monitoring terminal for displaying so as to achieve the purpose of monitoring;
the method of monitoring value handling by the monitoring value handling unit comprises:
step 1-1, performing orderly arrangement according to the received monitoring value and the front-back sequence of the receiving time points;
step 1-2, embedding the execution phase condition of the monitoring task in the execution period of the monitoring task corresponding to the monitoring value into the corresponding period, and obtaining the corresponding period message of the monitoring task;
the method for monitoring the task cutting task domain by the task cutting unit comprises the following steps: cutting in the period of monitoring the task, and the method of the task cutting unit cutting the task domain includes executing cutting according to the monitoring execution flow;
the deduction unit is used for calculating and analyzing the treated monitoring value, and the deduction unit is used for calculating the treated monitoring value based on the monitoring value of the monitoring task module for cutting the task domain of the monitoring task and backing up the external memory of the monitoring terminal, and comprises the following steps:
step 2-1, according to the task cutting unit, comparing the time length achieved by the first task domain in the monitoring task and the time length achieved by the first task domain in the monitoring task being executed with the time length achieved by the first task domain in the monitoring task being executed, wherein the time length achieved by the first task domain in the monitoring task being executed is similar to the external memory of the monitoring terminal, and the operation time period correction factor A is calculated according to the operation equation: a= { B c1 -B d }÷B c Here B c1 Time consuming achievement of first task domain for monitoring task being executed, B d The time length reached by the first task domain in the monitoring task is reached;
step 2-2, calculating the monitoring task being executed according to the time period correction factor obtained in step 1-1 and the achievement duration of the next task domain of the achieved monitoring taskThe operation equation of the evaluation amount of the time length achieved by the next task domain of the task is B k2 ＝B d2 X {1+A }, here B d2 Is the achievement duration of the next task domain of the achieved monitoring task, B k2 An estimated amount of time achieved by the next task domain of the monitoring task being performed;
step 2-3, calculating an adjustment factor according to the time length of the next task domain achievement of the monitoring task being executed and the time length of the next task domain achievement of the monitoring task being executed after the next task domain achievement of the monitoring task being executed, wherein the operation equation is q= { B c2 -B k2 }÷B c2 Here B c2 The time duration reached by the next task domain of the monitoring task being executed;
step 2-4, calculating the estimated amount of time length reached by the residual task domain of the monitoring task being executed according to the adjustment factor obtained in step 2-3 and the reached time length of the residual task domain of the achieved monitoring task, wherein the operation equation is B kc ＝B dx X {1+q }, wherein the x value interval in the equation is a positive integer of more than three, and n is the order code of the task domain;
a radar liquid level gauge is arranged at the top in the transformer oil tank;
the radar liquid level gauge is electrically connected with a controller arranged outside the transformer oil tank and is used for collecting the liquid level of the transformer oil tank;
the controller is connected with the WIFI module and is wirelessly connected with a monitoring terminal in the WLAN through the WIFI module;
the system comprises a monitoring value acquisition unit, a monitoring value treatment unit, a deduction unit, a task cutting unit and a prompt unit which are operated on a monitoring terminal;
the monitoring value acquisition unit is used for receiving the monitoring value containing the liquid level or the pressure, transmitting the received monitoring value to the monitoring value treatment unit, performing treatment on the received monitoring value, the deducing unit is used for performing operation and analysis on the treated monitoring value and transmitting an analysis value signal to the prompting unit, the prompting unit comprises a loudspeaker and a liquid crystal screen which are connected with the monitoring terminal, the loudspeaker is used for performing voice broadcasting on the received analysis value, the liquid crystal screen is used for performing display on the analysis value of the deducing unit, the task cutting unit is used for cutting the monitoring task containing the pressure monitoring task or the liquid level monitoring task into more than one task domain, each group of task domains is cut into more than one subtask group, the external memory of the monitoring terminal is used for backing up the monitoring value, the information of the external memory backup of the monitoring terminal contains the monitoring value achieved by the monitoring task and the monitoring value which is still monitored at present, and the monitoring value treatment unit transmits the treated monitoring information to the deducing unit according to the task domain cut by the task cutting unit;
the controller is also electrically connected with a piezoresistive pressure sensor arranged at the top in the transformer oil tank.
2. The method for multifunctional monitoring of vacuum oil injection of a transformer according to claim 1, wherein the method for analyzing the treated monitoring value by the deduction unit comprises the following steps:
step 3-1, obtaining the time length reached by the task domain of the monitoring task being executed, obtaining the evaluation value of the task domain of the monitoring task being executed according to the operation, and subtracting the evaluation value from the time length to obtain the interval value;
step 3-2, if the interval is lower than zero, according to the execution phase condition of the task domain of the monitoring task being executed and the execution phase condition of the task domain of the monitoring task being executed, which is similar to the task domain of the monitoring task being executed, the reason that the interval is lower than zero is determined, and the reason is transmitted to a prompt unit to prompt and backup in the external memory of the monitoring terminal;
and 3-3, if the interval is higher than zero, according to the ratio of the time length of each execution of more than one subtask group of the task domain of the monitoring task being executed in the total time length of the execution of the task domain to which the subtask group belongs, analyzing the three subtask groups with the highest ratio, identifying the reason that the interval is higher than zero, and transmitting the reason to a prompt unit for prompt.
3. The method for monitoring the vacuum oil injection of the transformer according to claim 1, wherein the prompting unit prompts the progress of the monitoring task to be accelerated to prevent hysteresis by prompting the fact that the time length reached by the task domain of the monitoring task being executed in the analysis value is longer than the evaluation value through a loudspeaker;
after the external memory of the monitoring terminal receives the reason of the high evaluation of the time length achieved by the task domain of the executing monitoring task, the situation of the execution stage forming the reason is backed up, and the subsequent application is facilitated, so that the optimization of the task monitoring task construction step is improved, the new method for improving the task progress can be directly used by developing the new monitoring task, and the achievement performance of the task is continuously improved along with the number of task achievement.
4. The method for monitoring the vacuum oil injection of the transformer according to claim 1, further comprising:
step 4-1, collecting the monitoring value, and executing treatment and cutting task fields on the monitoring value according to the corresponding time period;
step 4-2, performing operation analysis on the treated monitoring value and the achieved monitoring task which is similar to the monitoring task, and deducing the duration of the residual task domain of the monitoring task;
step 4-3, according to the continuous execution of the monitoring task, performing comparison analysis on the task domain achievement time length of the monitoring task and the deduced task domain time length;
and 4-4, prompting and backing up the parsed value.
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Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006125715A1 (en) * | 2005-05-23 | 2006-11-30 | PSI Aktiengesellschaft für Produkte und Systeme der Informationstechnologie | Method for the prevention of false alarms in a pressure drop-based leak identification system, and apparatus for carrying out such a method |
| KR100973504B1 (en) * | 2010-05-10 | 2010-08-03 | 이명수 | Apparatus and method for filtering and refining transformer insulation oil in live wire |
| KR100974860B1 (en) * | 2010-05-10 | 2010-08-11 | 이명수 | Apparatus and method for measuring insulating oil of transformer |
| EP2244089A1 (en) * | 2009-04-24 | 2010-10-27 | Josef Altmann | On-line diagnostic and prediction of dielectric behavior of power transformers |
| KR101001945B1 (en) * | 2010-02-02 | 2010-12-17 | 이명수 | Apparatus and method for changing transformer insulation oil to vegetable insulation oil in live wire |
| CN202523543U (en) * | 2012-03-12 | 2012-11-07 | 中国长江三峡集团公司 | Transformer with function of monitoring oil level of vacuum oiling |
| CN202711913U (en) * | 2012-06-11 | 2013-01-30 | 山东电力集团公司潍坊供电公司 | Vacuum oil-injection monitoring device for transformer |
| CN103440964A (en) * | 2013-09-10 | 2013-12-11 | 中国北车集团大同电力机车有限责任公司 | Equipment for vacuum oil pumping, vacuum oil injecting and leak test after oil injection |
| WO2014135015A1 (en) * | 2013-03-07 | 2014-09-12 | 国网安徽省电力公司芜湖供电公司 | Network for online monitoring of power transformer at intelligent substation |
| JP2016025223A (en) * | 2014-07-22 | 2016-02-08 | 愛知電機株式会社 | Method of manufacturing transformer using vegetable insulation oil |
| CN208315341U (en) * | 2018-07-06 | 2019-01-01 | 三峡大学 | A kind of transformer automatic control vacuum oiling device |
| CN211208195U (en) * | 2020-02-28 | 2020-08-07 | 三变科技股份有限公司 | Vacuum quantitative oil injection system for transformer |
| CN113963902A (en) * | 2021-10-28 | 2022-01-21 | 山东钢铁股份有限公司 | Method for vacuum exhaust and oil injection of transformer |
| CN114496529A (en) * | 2022-03-21 | 2022-05-13 | 南京智鹤电子科技有限公司 | Transformer oil monitoring system and monitoring method thereof |
-
2022
- 2022-08-22 CN CN202211008171.XA patent/CN115621019B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006125715A1 (en) * | 2005-05-23 | 2006-11-30 | PSI Aktiengesellschaft für Produkte und Systeme der Informationstechnologie | Method for the prevention of false alarms in a pressure drop-based leak identification system, and apparatus for carrying out such a method |
| EP2244089A1 (en) * | 2009-04-24 | 2010-10-27 | Josef Altmann | On-line diagnostic and prediction of dielectric behavior of power transformers |
| KR101001945B1 (en) * | 2010-02-02 | 2010-12-17 | 이명수 | Apparatus and method for changing transformer insulation oil to vegetable insulation oil in live wire |
| KR100973504B1 (en) * | 2010-05-10 | 2010-08-03 | 이명수 | Apparatus and method for filtering and refining transformer insulation oil in live wire |
| KR100974860B1 (en) * | 2010-05-10 | 2010-08-11 | 이명수 | Apparatus and method for measuring insulating oil of transformer |
| CN202523543U (en) * | 2012-03-12 | 2012-11-07 | 中国长江三峡集团公司 | Transformer with function of monitoring oil level of vacuum oiling |
| CN202711913U (en) * | 2012-06-11 | 2013-01-30 | 山东电力集团公司潍坊供电公司 | Vacuum oil-injection monitoring device for transformer |
| WO2014135015A1 (en) * | 2013-03-07 | 2014-09-12 | 国网安徽省电力公司芜湖供电公司 | Network for online monitoring of power transformer at intelligent substation |
| CN103440964A (en) * | 2013-09-10 | 2013-12-11 | 中国北车集团大同电力机车有限责任公司 | Equipment for vacuum oil pumping, vacuum oil injecting and leak test after oil injection |
| JP2016025223A (en) * | 2014-07-22 | 2016-02-08 | 愛知電機株式会社 | Method of manufacturing transformer using vegetable insulation oil |
| CN208315341U (en) * | 2018-07-06 | 2019-01-01 | 三峡大学 | A kind of transformer automatic control vacuum oiling device |
| CN211208195U (en) * | 2020-02-28 | 2020-08-07 | 三变科技股份有限公司 | Vacuum quantitative oil injection system for transformer |
| CN113963902A (en) * | 2021-10-28 | 2022-01-21 | 山东钢铁股份有限公司 | Method for vacuum exhaust and oil injection of transformer |
| CN114496529A (en) * | 2022-03-21 | 2022-05-13 | 南京智鹤电子科技有限公司 | Transformer oil monitoring system and monitoring method thereof |
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|---|---|
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