CN110926528A - Monitoring method and monitoring device for operation condition of external oil type metal corrugated oil conservator - Google Patents
Monitoring method and monitoring device for operation condition of external oil type metal corrugated oil conservator Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- G—PHYSICS
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- 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
- G01F23/0007—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 for discrete indicating and measuring
- G01F23/0015—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 for discrete indicating and measuring with a whistle or other sonorous signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
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Abstract
The invention discloses a monitoring method and a monitoring device for the operating condition of an external oil type metal corrugated oil conservator, wherein the monitoring device is arranged on the oil conservator; the monitoring device comprises an oil pressure acquisition module, an oil temperature acquisition module, an oil level acquisition module, a central processing unit, an alarm module and a power supply module; the oil level acquisition module is arranged inside the conservator body; the oil temperature acquisition module is arranged at the tail end of the injection and discharge oil pipe; the oil pressure acquisition module is arranged at the tail end of the injection and discharge oil pipe; the oil pressure acquisition module, the oil temperature acquisition module and the oil level acquisition module transmit acquired data to the central processing unit for processing; if the central processing unit judges that the friction force of the corrugated pipe is abnormal, or the corrugated pipe is jammed, or the oil level indication is judged to be wrong, the central processing unit controls the alarm module to give an alarm prompt; the power module provides required working power supply for the oil pressure acquisition module, the oil temperature acquisition module, the oil level acquisition module, the central processing unit and the alarm module.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a method and a device for monitoring the operation condition of an external oil type metal corrugated oil conservator.
Background
At present, transformer conservators can be divided into two types, namely capsule type conservators and metal bellows type conservators according to materials, and metal bellows type conservators can be divided into two types, namely internal oil type conservators and external oil type conservators according to the position of transformer oil. For the external oil type metal corrugated pipe oil conservator with the blocking monitoring device, the metal corrugated core with the variable volume is arranged in the external oil type metal corrugated pipe oil conservator, so that air and transformer oil can be isolated, and the transformer oil is prevented from being wetted and oxidized due to the fact that the transformer oil is in contact with the air. The working principle of the metal corrugated pipe type oil conservator is similar to that of a capsule type oil conservator, gas in the inner space of the metal corrugated pipe type oil conservator exchanges with external gas through a breathing pipeline and a respirator, and when transformer oil expands or contracts along with temperature change, the size of a cavity is changed through expansion and contraction of a metal corrugated core body, and then the gas is inhaled or exhaled through the respirator. Because the outer oil type metal corrugated pipe adopts horizontal extension, the requirement on a track pulley and the like outside the corrugated pipe is high, however, in actual operation, the condition that the pulley is abraded and blocked is caused due to friction between the outer oil type metal corrugated pipe and a shell often occurs.
If the metal corrugated pipe is blocked, when the transformer oil expands or contracts along with the temperature, the corrugated pipe cannot normally contract or expand, oil leakage, oil spilling and other phenomena may be caused at weak parts of a transformer oil tank, a valve, a gas relay station and the like, or when the internal pressure is overlarge, a pressure release valve may be caused to malfunction, and the corrugated pipe may also shake, so that oil flow surges to cause malfunction of heavy gas protection of the transformer.
Disclosure of Invention
The invention provides a method and a device for monitoring the operating condition of an external oil type metal corrugated conservator, aiming at solving the problem that the operating condition of an external oil type metal corrugated oil conservator cannot be monitored in time when a metal corrugated pipe is blocked and the problem of oil leakage, oil overflow or pressure release valve misoperation caused by the fact that the metal corrugated pipe is blocked is solved.
In order to achieve the purpose of the invention, the technical scheme is as follows: a method for monitoring the operation condition of an external oil type metal corrugated oil conservator comprises the following steps:
s1: collecting oil temperature t and oil pressure P in the running process of transformerOilOil level hOil levelJudging whether the oil temperature is in an ascending trend or a descending trend according to the oil temperature t, and distinguishing and storing POil-gainOr POil-reductionA value; when t temperature has been stored P separatelyOil-gain、POil-reductionAnd hOil levelAveraging the value acquired in the sampling period and the stored value to obtain an information value at the temperature t;
s2: calculating P at the same temperatureOil-gain-POil-reductionDifference value △ P of1If T is1△ P within a time interval1＞PThreshold 1Is more than n1In the next time, judging that the friction force of the corrugated pipe is abnormal;
s3: by T0Is a period, P at the same temperature in the first periodOil-gain-POil-reductionDifference value △ P of0Is a reference value when T0△ P of a certain sampling period in a cycle1Greater than k △ P0If k is larger than 1, judging that the friction force of the corrugated pipe is abnormal;
s4: calculate two adjacentPressure change △ P of sampling period2When at T1Occurrence of n within a sampling period1Sub △ P2Greater than PThreshold 2Judging that the corrugated pipe is jammed;
s5: judging the oil temperature t and the oil pressure P of the sampling periodOilCorresponding common real oil level hOil 1And the collected oil level hOilBy contrast, when | hOil 1-hOil| is greater than threshold hThreshold(s)When the oil level indication is erroneous, it is determined.
The invention also provides a monitoring device for the operating condition of the external oil type metal corrugated oil conservator, which is based on the monitoring method for the operating condition of the external oil type metal corrugated oil conservator and is used for being installed on the oil conservator; the oil conservator comprises an oil conservator body and an oil injection and drainage pipe; the oil conservator body is connected and communicated with the oil injection and drainage pipe;
the monitoring device is detachably connected with the tail end of the injection and discharge oil pipe; the monitoring device comprises an oil pressure acquisition module, an oil temperature acquisition module, an oil level acquisition module, a central processing unit, an alarm module and a power supply module;
the oil level acquisition module is arranged inside the oil conservator body and used for acquiring oil level data; the oil temperature acquisition module is arranged at the tail end of the injection and discharge oil pipe and is used for acquiring oil temperature data; the oil pressure acquisition module is arranged at the tail end of the injection and discharge oil pipe and is used for acquiring oil pressure data;
the oil pressure acquisition module, the oil temperature acquisition module and the oil level acquisition module transmit acquired data to the central processing unit; the central processing unit performs the monitoring method for processing;
if the central processing unit judges that the friction force of the corrugated pipe is abnormal, or the corrugated pipe is jammed, or the oil level indication is judged to be wrong, the central processing unit controls the alarm module to give an alarm prompt;
the power module provides required working power supply for the oil pressure acquisition module, the oil temperature acquisition module, the oil level acquisition module, the central processing unit and the alarm module.
Preferably, the monitoring device further comprises a housing; the shell is detachably connected with the tail end of the injection and discharge oil pipe; the oil pressure acquisition module, the oil temperature acquisition module, the central processing unit, the alarm module and the power module are all arranged in the shell.
Furthermore, the monitoring device also comprises a connecting flange; the shell is detachably connected with the tail end of the injection and discharge oil pipe through a connecting flange.
Still further, the oil pressure acquisition module comprises a pressure sensor and a first AD converter; the pressure sensor is arranged on the outer surface of the shell and used for collecting oil pressure data in the oil conservator; the first AD converter is arranged in the shell; the output end of the pressure sensor is electrically connected with the input end of the first AD converter; the output end of the first AD converter is electrically connected with the first input end of the central processing unit; the power supply module provides required working power supply for the pressure sensor and the first AD converter.
Still further, the oil temperature acquisition module comprises a temperature sensor and a second AD converter; the temperature sensor is arranged on the outer surface of the shell and used for collecting oil temperature data in the oil conservator; the second AD converter is arranged in the shell; the output end of the temperature sensor is electrically connected with the input end of the second AD converter; the output end of the second AD converter is electrically connected with the second input end of the central processing unit; the power supply module provides required working power supply for the temperature sensor and the second AD converter.
Still further, the oil level collection module comprises an oil level indicator and a third AD converter; the oil level gauge is arranged inside the oil conservator and used for acquiring oil level data inside the oil conservator; the third AD converter is arranged in the shell; the output end of the oil level indicator is electrically connected with the input end of the third AD converter; the output end of the third AD converter is electrically connected with the third input end of the central processing unit; and the power supply module supplies required working power to the oil level indicator and the third AD converter.
Still further, the central processing unit is STM8S003F3P 6; the alarm module adopts a buzzer; the first output end of the central processing unit is electrically connected with the input end of the buzzer.
Still further, the monitoring device further comprises a memory; the memory is electrically connected with the central processing unit.
Still further, the monitoring device further comprises a display module; the input end of the display module is electrically connected with the second output end of the central processing unit; the power supply module provides a required working power supply for the display module; the display module is arranged on the outer surface of the shell.
The invention has the following beneficial effects:
1. the invention can accurately judge whether the corrugated pipe has abnormal friction force, whether the corrugated pipe has jamming or whether the oil level indication is wrong or not according to the relation among the acquired oil temperature, oil pressure and oil level by carrying out comprehensive operation processing.
2. The invention utilizes the temperature sensor, the oil level indicator and the pressure sensor to collect data, transmits the collected data to the central processing unit for processing, and if abnormity occurs, the central processing unit controls the alarm module to give an alarm. The invention realizes the automatic collection and monitoring process, solves the problem that no corresponding monitoring device is used for monitoring the transformer conservator in the prior art, and can inform workers in time, thereby effectively ensuring the safe and stable operation of the transformer.
Drawings
FIG. 1 is a graph showing the relationship between the oil temperature and the displacement of the end face of the bellows in accordance with example 1.
Fig. 2 is a schematic diagram of four stages of movement of the bellows in the conservator in accordance with example 1.
FIG. 3 is a graph of the force applied to the bellows during expansion and contraction in accordance with example 1.
FIG. 4 is a flow chart of the steps of the monitoring method described in example 1.
Fig. 5 is a schematic structural diagram of the monitoring device according to embodiment 2.
FIG. 6 is a block circuit diagram of the monitoring device according to embodiment 2.
Fig. 7 is a schematic view of the monitoring device of embodiment 2 mounted on a transformer conservator.
In the figure, 1-an oil conservator body, 2-an oil injection and drainage pipe, 3-a monitoring device, 4-a shell, 5-an alarm module, 6-a display module, 7-an oil pressure acquisition module, 8-a central processing unit, 9-a connecting flange, 10-an exhaust pipe, 11-a respirator connecting pipe, 12-a respirator, 13-a metal corrugated pipe and 14-an oil temperature acquisition module.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description.
Example 1
In order to better monitor the data of the transformer conservator, the abnormity of the transformer conservator is judged more accurately. Therefore, before data acquisition and monitoring of the transformer conservator, a motion model of the corrugated pipe in the conservator is established:
as shown in fig. 1: the end face of the corrugated pipe is assumed to be at the O point when the corrugated pipe does not expand or contract, namely in a free state; the corrugated pipe moves slowly between AB along with the expansion or contraction of the transformer oil, when the end face of the corrugated pipe is between AO, the corrugated pipe is in a contraction state, and the corrugated pipe generates a restoring thrust FWave (wave)(ii) a When the end face of the corrugated pipe is between OB, the corrugated pipe is in an expansion state, and the corrugated pipe generates retraction tension FWave (wave)(ii) a I.e. the bellows leaves the free position, will generate a deformation force FWave (wave). The left direction is defined as the positive direction.
Assuming normal operation of the bellows, atmospheric pressure FAtmosphere (es)Constant, constant.
Assuming bellows expansion force FWave (wave)In linear relation to bellows displacement s, i.e. FWave (wave)＝f1(s); since the oil temperature of the transformer can not change suddenly, the expansion of the transformer oil can not change suddenly, and the corrugated pipe is in an approximate cylindrical shape, the oil pressure change of the transformer and the end face movement displacement of the corrugated pipe are considered to be in a linear relationship, FOil＝f2(s) as shown in FIG. 1.
For the external oil type metal corrugated pipe oil level indicator, the metal belt connected with the movable end face of the metal corrugated pipe is used for conduction, and the corrugated pipe stretches and contractsWhen the oil level is measured, the scale changes in the oil level window, namely the oil level changes along with the expansion and contraction of the corrugated pipe, namely the end face movement displacement s of the corrugated pipe and the indicated oil level h of the oil level indicatorOil levelIn a linear relationship. Can indirectly derive the oil pressure FOilWith the oil level hOil levelIn a linear relationship.
Because the transformer has large heat capacity and slow temperature change, namely the corrugated pipe moves slowly due to the expansion caused by heat and contraction caused by cold of oil, under the normal condition, the speed can not generate large change, the acceleration is extremely small, namely the stress of the wall of the corrugated pipe is basically in a balanced state. The bellows can move in the conservator in four stages, as shown in fig. 2:
1. stage B → O
The transformer oil begins to expand, the corrugated pipe wall is acted by four forces, and the tensile force F for the corrugated pipe to retractWave (wave)Transformer oil pressure FOil-gainFrictional force of skidding-FFrictional forceAnd atmospheric pressure FAtmosphere (es)Four force balance FWave (wave)+FOil-gain-FAtmosphere (es)-FFrictional force＝0。
2. Stage O → A
The transformer oil continues to expand, the corrugated pipe continues to move leftwards after crossing the point O, and the corrugated pipe is subjected to the recovery thrust-F of the corrugated pipeWave (wave)Transformer oil pressure FOil-gainFrictional force of skidding-FFrictional forceAtmospheric pressure FAtmosphere (es)，-FWave (wave)+FOil-gain-FAtmosphere (es)-FFrictional force＝0。
3. Stage A → O
The transformer oil is in the expansion stage, but the expansion is slowly weakened, and the corrugated pipe wall is subjected to the corrugated pipe restoring thrust-FWave (wave)Transformer oil pressure FOil-reductionFrictional force F of roller skateFrictional forceAtmospheric pressure FAtmosphere (es)，-FWave (wave)+FOil-reduction-FAtmosphere (es)+FFrictional force＝0。
4. Stage O → B
Bellows deformation force FWave (wave)Transformer oil pressure FOil-reductionAtmospheric pressure-FAtmosphere (es)And frictional force FFriction ofForce ofReach equilibrium FWave (wave)+FOil-reduction-FAtmosphere (es)+FFrictional force＝0。
And combining the four stages to obtain a stress graph when the corrugated pipe expands and contracts, as shown in figure 3. It can be seen that the bellows is subjected to a frictional force of (F) at the same displacementOil-gain-FOil-reduction)/2。
(1) When the corrugated pipe has bad running conditions such as jamming and the like, the friction force F of the corrugated pipe wheel slipFrictional forceThe expansion will affect the expansion and contraction of the corrugated pipe, thereby affecting the safe temperature operation of the transformer;
(2) when serious jamming occurs, the corrugated pipe can shake in the moving process, and the like, so that the oil pressure of the transformer can fluctuate greatly;
(3) when the false oil level appears in the conservator and can not be found in time, the running condition of the corrugated pipe can not be known, and potential safety hazard exists.
In order to solve the above problems and the phenomena shown according to the above problems, this embodiment provides a method for monitoring the operation condition of an external oil type metal bellows conservator, where the method determines the operation condition of a bellows by collecting and recording information related to the operation condition of the bellows and performing logic analysis on the information.
According to the analysis of the operation condition of the corrugated pipe, the operation condition of the corrugated pipe is related to oil temperature, oil pressure, corrugated pipe end face movement displacement, corrugated pipe stress, atmospheric pressure, corrugated pipe skidding friction force and other factors, but the corrugated pipe movement displacement, the corrugated pipe stress and the corrugated pipe skidding friction force cannot be measured, and according to the embodiment, the amount which is difficult to measure is converted into the amount which is easy to measure through the relation between the oil pressure and the friction force, the relation between the oil level and the movement displacement of the end face of the corrugated pipe and the relation between the corrugated pipe stress and the movement displacement, so that the operation condition of the corrugated pipe is indirectly judged. Easily measured quantities include transformer oil temperature, oil pressure, and oil level.
The bellows is cylindrical, so the transformer oil pressure (relative pressure) at the middle position of the bellows is the quotient of the pressure at the end face of the bellows and the wall area:
Poil＝FOil/SWall(s)
As shown in fig. 4, the monitoring method for the operating condition of the external oil type metal corrugated conservator provided in this embodiment includes the following steps:
s1: collecting oil temperature t and oil pressure P in the running process of transformerOilOil level hOil levelJudging whether the oil temperature is in an ascending trend or a descending trend according to the oil temperature t, and distinguishing and storing POil-gainOr POil-reductionA value; when t temperature has been stored P separatelyOil-gain、POil-reductionAnd hOil levelAveraging the value acquired in the sampling period and the stored value to obtain an information value at the temperature t;
s2: calculating P at the same temperatureOil-gain-POil-reductionDifference value △ P of1If T is1△ P within a time interval1＞PThreshold 1Is more than n1In the next time, judging that the friction force of the corrugated pipe is abnormal;
s3: by T0Is a period, P at the same temperature in the first periodOil-gain-POil-reductionDifference value △ P of0Is a reference value when T0△ P of a certain sampling period in a cycle1Greater than k △ P0If k is larger than 1, judging that the friction force of the corrugated pipe is abnormal;
s4 calculating pressure change △ P of two adjacent sampling periods2When at T1Occurrence of n within a sampling period1Sub △ P2Greater than PThreshold 2Judging that the corrugated pipe is jammed;
s5: judging the oil temperature t and the oil pressure P of the sampling periodOilCorresponding common real oil level hOil 1And the collected oil level hOilBy contrast, when | hOil 1-hOil| is greater than threshold hThreshold(s)When the oil level indication is erroneous, it is determined.
According to the embodiment, comprehensive operation is performed according to the collected oil temperature, oil pressure and oil level, and the operation condition of the oil conservator can be accurately monitored.
Example 2
Based on the method for monitoring the operating condition of the external oil type metal corrugated conservator in embodiment 1, the present embodiment further provides a device for monitoring the operating condition of the external oil type metal corrugated conservator, as shown in fig. 5, 6 and 7, the monitoring device 3 is used for being installed on the conservator; the oil conservator comprises an oil conservator body 1 and an oil injection and drainage pipe 2; the oil conservator body 1 is connected and communicated with the oil injection and drainage pipe 2;
the monitoring device 3 is detachably connected with the tail end of the injection and discharge oil pipe 2; the monitoring device 3 comprises an oil pressure acquisition module 7, an oil temperature acquisition module 14, an oil level acquisition module, a central processing unit 8, an alarm module 5 and a power supply module;
the oil level acquisition module is arranged inside the conservator body 1 and used for acquiring oil level data; the oil temperature acquisition module 14 is arranged at the tail end of the injection and discharge oil pipe 2 and is used for acquiring oil temperature data; the oil pressure acquisition module 7 is arranged at the tail end of the injection and discharge oil pipe 2 and is used for acquiring oil pressure data;
the oil pressure acquisition module 7, the oil temperature acquisition module 14 and the oil level acquisition module transmit acquired data to the central processing unit 8; the central processing unit 8 performs the monitoring method as described in embodiment 1;
if the central processing unit 8 judges that the friction force of the corrugated pipe is abnormal, or judges that the corrugated pipe is jammed, or judges that the oil level indication is wrong, the central processing unit controls the alarm module to give an alarm prompt;
the power module provides required working power for the oil pressure acquisition module 7, the oil temperature acquisition module 14, the oil level acquisition module, the central processing unit 8 and the alarm module 5.
In the embodiment, the oil pressure acquisition module 7, the oil temperature acquisition module 14 and the oil level acquisition module are used for data acquisition, the acquired data are transmitted to the central processing unit 8 for judgment and processing, automatic monitoring is realized, and whether the conservator is abnormal or not can be accurately judged according to the acquired data.
The monitoring device 3 of the present embodiment further includes a housing 4; the shell 4 is detachably connected with the tail end of the injection and discharge oil pipe 2; the oil pressure acquisition module 7, the oil temperature acquisition module 14, the central processing unit 8, the alarm module 5 and the power module are all arranged in the shell.
The monitoring device 3 further comprises a connecting flange 9; the shell 4 is detachably connected with the tail end of the injection and discharge oil pipe 2 through a connecting flange 9. Monitoring devices 3 install on annotating oil drain pipe 2 through flange 9, when the transformer need annotate the oil drain, can directly pull down monitoring devices 3, do not influence and annotate the oil drain.
The oil pressure acquisition module 7 described in this embodiment includes a pressure sensor and a first AD converter; the pressure sensor is arranged on the outer surface of the shell and used for collecting oil pressure data in the oil conservator; the first AD converter is arranged in the shell; the output end of the pressure sensor is electrically connected with the input end of the first AD converter; the output end of the first AD converter is electrically connected with the first input end of the central processing unit; the power supply module provides required working power supply for the pressure sensor and the first AD converter.
The oil temperature acquisition module 14 comprises a temperature sensor and a second AD converter; the temperature sensor is arranged on the outer surface of the shell and used for collecting oil temperature data in the oil conservator; the second AD converter is arranged in the shell; the output end of the temperature sensor is electrically connected with the input end of the second AD converter; the output end of the second AD converter is electrically connected with the second input end of the central processing unit; the power supply module provides required working power supply for the temperature sensor and the second AD converter.
The oil level acquisition module comprises an oil level indicator and a third AD converter; the oil level gauge is arranged inside the oil conservator and used for acquiring oil level data inside the oil conservator; the third AD converter is arranged in the shell; the output end of the oil level indicator is electrically connected with the input end of the third AD converter; the output end of the third AD converter is electrically connected with the third input end of the central processing unit; and the power supply module supplies required working power to the oil level indicator and the third AD converter.
In the prior art, the transformer conservator carries the oil level indicator, and the embodiment can be processed by only transmitting the data acquired by the oil level indicator to the central processing unit.
The AD converter described in this embodiment employs PCF8591, and PCF8591 is a single-chip integrated, single-power-supply, low-power-consumption, 8-bit CMOS data acquisition device. The PCF8591 has 4 analog inputs, 1 analog output and 1 serial I2And C, bus interface. Therefore, the temperature sensor, the oil level indicator and the pressure sensor can share one PCF8591, and the output end of the temperature sensor, the output end of the oil level indicator and the output end of the pressure sensor are electrically connected with PCF85913 analog input ends, so that the cost and the space of the monitoring device can be saved.
The central processing unit 8 is STM8S003F3P 6; the alarm module 5 adopts a buzzer; the first output end of the central processing unit is electrically connected with the input end of the buzzer. The PCF85913 is in communication connection with the central processing unit through an IIC bus; and transmitting the digital signal to a central processing unit for processing.
Considering that a central processing unit needs to process a large amount of data and needs to store the data, the monitoring device described in this embodiment further includes a memory chip; the memory chip is electrically connected with the central processing unit; the memory chip described in this embodiment may be of a type using the memory AT24C 04C.
The monitoring device 2 further comprises a display module 6; the input end of the display module 6 is electrically connected with the second output end of the central processing unit 8; the power supply module provides required working power supply for the display module 6; the display module is arranged on the outer surface of the shell. The display module is used for displaying whether the oil pressure, the oil temperature, the oil level and the oil conservator are abnormal or not. The display is 12864 lcd.
As shown in fig. 7, the conservator further comprises an exhaust pipe 10; the exhaust pipe 10 is arranged at the bottom of the conservator body 1 and is communicated with the conservator body 1. The exhaust pipe 10 can timely exhaust gas when being blocked, and phenomena of oil leakage, oil spilling and the like at weak positions of the conservator body 1, a valve arranged on the conservator body 1 and the like are avoided.
The oil conservator also comprises a breather connecting pipe 11 and a breather 12; one end of the breather connecting pipe 11 is connected and communicated with the conservator body 12; the other end of the respirator connecting pipe 11 is connected and communicated with a respirator 12. The breather 12 can effectively ensure the safe and stable operation of the conservator body. A metal corrugated pipe 13 is arranged in the oil conservator body 1; the metal corrugated pipe 13 is transversely arranged.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A method for monitoring the operation condition of an external oil type metal corrugated oil conservator is characterized in that: the monitoring method comprises the following steps:
s1: collecting oil temperature t and oil pressure P in the running process of transformerOilOil level hOil levelJudging whether the oil temperature is in an ascending trend or a descending trend according to the oil temperature t, and distinguishing and storing POil-gainOr POil-reductionA value; when t temperature has been stored P separatelyOil-gain、POil-reductionAnd hOil levelAveraging the value acquired in the sampling period and the stored value to obtain an information value at the temperature t;
s2: calculating P at the same temperatureOil-gain-POil-reductionDifference value △ P of1If T is1△ P within a time interval1＞PThreshold 1Is more than n1In the next time, judging that the friction force of the corrugated pipe is abnormal;
s3: by T0Is a period, P at the same temperature in the first periodOil-gain-POil-reductionDifference value △ P of0Is a reference value when T0△ P of a certain sampling period in a cycle1Greater than k △ P0Wherein k is more than 1, judging that the frictional force of the corrugated pipe is differentFrequently;
s4 calculating pressure change △ P of two adjacent sampling periods2When at T1Occurrence of n within a sampling period1Sub △ P2Greater than PThreshold 2Judging that the corrugated pipe is jammed;
s5: judging the oil temperature t and the oil pressure P of the sampling periodOilCorresponding common real oil level hOil 1And the collected oil level hOilBy contrast, when | hOil 1-hOil| is greater than threshold hThreshold(s)When the oil level indication is erroneous, it is determined.
2. The monitoring device for the operating condition of the external oil type metal corrugated oil conservator is used for being installed on the oil conservator; the oil conservator comprises an oil conservator body and an oil injection and drainage pipe; the oil conservator body is connected and communicated with the oil injection and drainage pipe; the method is characterized in that:
the monitoring device is detachably connected with the tail end of the injection and discharge oil pipe; the monitoring device comprises an oil pressure acquisition module, an oil temperature acquisition module, an oil level acquisition module, a central processing unit, an alarm module and a power supply module;
the oil level acquisition module is arranged inside the oil conservator body and used for acquiring oil level data; the oil temperature acquisition module is arranged at the tail end of the injection and discharge oil pipe and is used for acquiring oil temperature data; the oil pressure acquisition module is arranged at the tail end of the injection and discharge oil pipe and is used for acquiring oil pressure data;
the oil pressure acquisition module, the oil temperature acquisition module and the oil level acquisition module transmit acquired data to the central processing unit; the central processing unit performs processing according to the monitoring method of claim 1;
if the central processing unit judges that the friction force of the corrugated pipe is abnormal, or the corrugated pipe is jammed, or the oil level indication is judged to be wrong, the central processing unit controls the alarm module to give an alarm prompt;
the power module provides required working power supply for the oil pressure acquisition module, the oil temperature acquisition module, the oil level acquisition module, the central processing unit and the alarm module.
3. The monitoring device for the operating condition of the external oil type metal corrugated conservator as claimed in claim 2, wherein: the monitoring device also comprises a shell; the shell is detachably connected with the tail end of the injection and discharge oil pipe; the oil pressure acquisition module, the oil temperature acquisition module, the central processing unit, the alarm module and the power module are all arranged in the shell.
4. The monitoring device for the operating condition of the external oil type metal corrugated conservator as claimed in claim 3, wherein: the monitoring device also comprises a connecting flange; the shell is detachably connected with the tail end of the injection and discharge oil pipe through a connecting flange.
5. The monitoring device for the operating condition of the external oil type metal corrugated conservator as claimed in any one of claims 3 or 4, wherein: the oil pressure acquisition module comprises a pressure sensor and a first AD converter; the pressure sensor is arranged on the outer surface of the shell and used for collecting oil pressure data in the oil conservator; the first AD converter is arranged in the shell; the output end of the pressure sensor is electrically connected with the input end of the first AD converter; the output end of the first AD converter is electrically connected with the first input end of the central processing unit; the power supply module provides required working power supply for the pressure sensor and the first AD converter.
6. The monitoring device for the operating condition of the external oil type metal corrugated conservator as claimed in claim 5, wherein: the oil temperature acquisition module comprises a temperature sensor and a second AD converter; the temperature sensor is arranged on the outer surface of the shell and used for collecting oil temperature data in the oil conservator; the second AD converter is arranged in the shell; the output end of the temperature sensor is electrically connected with the input end of the second AD converter; the output end of the second AD converter is electrically connected with the second input end of the central processing unit; the power supply module provides required working power supply for the temperature sensor and the second AD converter.
7. The monitoring device for the operating condition of the external oil type metal corrugated conservator as claimed in claim 6, wherein: the oil level acquisition module comprises an oil level indicator and a third AD converter; the oil level gauge is arranged inside the oil conservator and used for acquiring oil level data inside the oil conservator; the third AD converter is arranged in the shell; the output end of the oil level indicator is electrically connected with the input end of the third AD converter; the output end of the third AD converter is electrically connected with the third input end of the central processing unit; and the power supply module supplies required working power to the oil level indicator and the third AD converter.
8. The monitoring device for the operating condition of the external oil type metal corrugated conservator as claimed in claim 7, wherein: the model of the central processing unit is STM8S003F3P 6; the alarm module adopts a buzzer; the first output end of the central processing unit is electrically connected with the input end of the buzzer.
9. The monitoring device for the operating condition of the external oil type metal corrugated conservator as claimed in claim 8, wherein: the monitoring device also comprises a memory; the memory is electrically connected with the central processing unit.
10. The monitoring device for the operating condition of the external oil type metal corrugated conservator as claimed in claim 9, wherein: the monitoring device also comprises a display module; the input end of the display module is electrically connected with the second output end of the central processing unit; the power supply module provides a required working power supply for the display module; the display module is arranged on the outer surface of the shell.
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