CN111122075A - Device and method for detecting air tightness of oil conservator - Google Patents
Device and method for detecting air tightness of oil conservator Download PDFInfo
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- CN111122075A CN111122075A CN201911325971.2A CN201911325971A CN111122075A CN 111122075 A CN111122075 A CN 111122075A CN 201911325971 A CN201911325971 A CN 201911325971A CN 111122075 A CN111122075 A CN 111122075A
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- conservator
- oil conservator
- pressure
- top plate
- telescopic rod
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3263—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers using a differential pressure detector
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- Transformer Cooling (AREA)
Abstract
The invention discloses a device and a method for detecting the air tightness of an oil conservator, wherein the oil conservator is arranged between a base and a top plate of a fixing device, a telescopic rod is adjusted to enable the distance between the base and the top plate to be gradually increased, an air source device is started to inflate and pressurize the oil conservator, so that the oil conservator extends to two ends to respectively prop against the base and the top plate, when the pressure value of a pressure measuring device reaches a first preset value, the air source device is closed, the pressure value of the pressure measuring device in a preset time period is obtained, whether the oil conservator leaks air or not is judged according to the change of the pressure value, the detection of the oil conservator on each length to be detected can be completed, the oil conservator is comprehensively detected in advance, the accuracy is higher, and time and labor are saved.
Description
Technical Field
The application belongs to the field of conventional tests of transformers and relates to a device and a method for detecting air tightness of an oil conservator.
Background
Under the condition of completely isolating air and moisture, when the volume of insulating oil in the transformer expands or contracts along with the change of temperature, the corrugated core body in the oil conservator changes the size of an oil cavity of the oil conservator through expansion and contraction, so that the volume compensation of the transformer oil is realized. Before the transformer is installed and put into operation after overhaul, the leakage detection operation needs to be carried out on the transformer, the existing mode still stays in the conventional regular inspection mode, and the oil conservator belongs to a part of the transformer, so that some changes of the oil conservator are easily ignored in the process of carrying out a preventive test. The existing solving measures can lead the transformer conservator to be found in the operation process after being damaged, and the principle of state maintenance is not met, so that the mode is time-consuming and labor-consuming, and the accuracy is lower.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide an apparatus and a method for detecting the airtightness of a conservator.
In order to overcome the defects of the prior art, the technical scheme provided by the invention is as follows:
the invention provides an air tightness detection device of an oil conservator, which is characterized by comprising a fixing device, an air source device and a pressure measuring device, wherein the fixing device is arranged on the oil conservator;
the fixing device comprises a base, a top plate and a telescopic rod, wherein a movable section and a fixed section of the telescopic rod are respectively connected with the base and the top plate, and the distance between the base and the top plate is equal to the telescopic length of the oil conservator;
the air source device is communicated with an air inlet of the oil conservator through an inflation pipeline, is used for supplying air and pressurizing the oil conservator, and is used for ensuring that two ends of the oil conservator always tightly push the base and the top plate when inflation is finished;
the pressure measuring device is communicated with the air inlet of the oil conservator through a detection pipeline and is used for detecting the pressure value of the gas in the oil conservator so as to stop inflating when the pressure value of the gas is larger than or equal to a first set value.
The invention also provides a detection method using the device for detecting the air tightness of the conservator, which is characterized by comprising the following steps:
s1: adjusting the telescopic rod to enable the distance between the base and the top plate to be equal to the length to be detected of the oil conservator;
s2: starting the air source device, and inflating and pressurizing the oil conservator to enable the oil conservator to extend to two ends to tightly prop against the base and the top plate respectively;
s3: the pressure value of the pressure measuring device is obtained in real time, when the pressure value reaches a first preset value, the air source device is closed, and the oil conservator is stopped being inflated;
s4: after the air source device is closed, acquiring a pressure value of the pressure measuring device within a preset time period, and judging whether the oil conservator leaks air according to whether the pressure value changes, so as to finish the detection of the length of the oil conservator to be detected;
s5: and adjusting the telescopic rod, increasing the distance between the base and the top plate, prolonging the length of the conservator to be detected, and repeatedly executing S2-S4 until the detection of the longest length of the conservator to be detected is completed.
Compared with the prior art, the invention has the beneficial effects that:
according to the scheme, the oil conservator is arranged between the base and the top plate of the fixing device, the telescopic rod is adjusted to enable the distance between the base and the top plate to be gradually increased, the air source device is started when the distance is adjusted to one distance, the oil conservator is inflated and pressed to enable the oil conservator to extend to two ends to respectively prop against the base and the top plate, when the pressure value of the pressure measuring device reaches a first preset value, the air source device is closed, the pressure value of the pressure measuring device in a preset time period is obtained, whether the oil conservator leaks air or not is judged according to the fact that whether the pressure value changes or not, detection of the oil conservator at each length to be detected can be completed, comprehensive leakage detection of the oil conservator is conducted in advance, accuracy is high, and time and labor are.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention to its proper form. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 is a schematic connection diagram of an oil conservator air tightness detection device provided in an embodiment of the present invention;
FIG. 2 is a perspective view of a fixing device according to an embodiment of the present invention;
FIG. 3 is a diagram of a connection structure between the retractable rod and the base according to the embodiment of the present invention;
fig. 4 is a flowchart of a method for detecting the airtightness of the conservator according to an embodiment of the present invention.
In the figure: 1-an air source device, 2-a pressure measuring device, 3-a fixing device, 31-a base, 311-a sliding rail, 32-a top plate, 321-a sliding chute, 33-a telescopic rod, 331-a movable section, 332-a fixed section, 333-a sliding block, 34-a fastening piece, 4-a pressure relief device, 5-a dryer, 6-a first control valve, 7-a second control valve and 8-an oil conservator.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As mentioned in the background art, under the condition of completely isolating air and moisture, when the volume of the insulating oil in the transformer expands or contracts along with the temperature change, the corrugated core body in the oil conservator changes the size of the oil cavity of the oil conservator through expansion and contraction, so that the volume compensation of the transformer oil is realized. Before the transformer is installed and put into operation after overhaul, the leakage detection operation needs to be carried out on the transformer, the existing mode still stays in the conventional regular inspection mode, and the oil conservator belongs to a part of the transformer, so that some changes of the oil conservator are easily ignored in the process of carrying out a preventive test. The existing solving measures can lead the transformer conservator to be found in the operation process after being damaged, and the principle of state maintenance is not met, so that the mode is time-consuming and labor-consuming, and the accuracy is lower.
Therefore, how to reduce the detection workload of the conservator, improve the detection accuracy and become the improvement direction of the application, the concept of the application is to inflate the conservator through the air source device, so that the two ends of the conservator are always abutted against the base and the top plate, the distance between the base of the fixing device and the top plate is changed to adjust the detection length of the conservator, and whether the pressure value of the pressure measuring device is changed or not is judged to damage each part of the conservator under each detection length, so that the device and the method for detecting the airtightness of the conservator are provided.
Referring to fig. 1 to 3, the present invention is illustrated in a conservator airtightness testing apparatus. The device for detecting the air tightness of the oil conservator comprises a fixing device 3, an air source device 1 and a pressure measuring device 2; the fixing device 3 comprises a base 31, a top plate 32 and an expansion link 33, wherein a movable section 331 and a fixed section 332 of the expansion link 33 are respectively connected with the base 31 and the top plate 32, and the distance between the base 31 and the top plate 32 is equal to the expansion length of the oil conservator 8; the air source device 1 is communicated with an air inlet of the oil conservator 8 through an inflation pipeline, is used for supplying air and pressurizing the interior of the oil conservator 8, and is used for ensuring that two ends of the oil conservator 8 always tightly push against the base 31 and the top plate 32 when inflation is finished; the pressure measuring device 2 is communicated with an air inlet of the oil conservator 8 through a detection pipeline and is used for detecting the pressure value of the gas in the oil conservator 8 so as to stop inflating when the pressure value of the gas is larger than or equal to a first set value.
And a first control valve 6 is arranged on the inflation pipeline between the air source device 1 and the air inlet of the oil conservator 8, and a second control valve 7 is arranged on the detection pipeline between the pressure measurement device 2 and the air inlet of the oil conservator 8. The first control valve 6 is used for controlling the on-off of gas entering the oil conservator 8, and the second control valve 7 is used for controlling whether the pressure measuring device 2 can detect the pressure of the gas. And the inflation pipeline is provided with a dryer 5 for drying the gas entering the oil conservator 8. It should be noted that the first control valve 6 and the second control valve 7 are preferably solenoid valves. The air source device 1 adopts an air compressor.
In an embodiment, the base 31 is provided with a slide rail 311, the fixed section 332 of each expansion link 33 is provided with a slide block 333, the slide block 333 is clamped in the slide rail 311, the top plate 32 is provided with a slide slot 321, and the movable section 331 of each expansion link 33 is clamped in the slide slot 321. By moving the position of the movable section 331 of the telescopic rod 33 in the sliding groove 321 and the position of the sliding block 333 in the sliding rail 311, the oil conservator 8 with different shapes and specifications can be adapted.
Specifically, the sliding slot 321 penetrates through the top plate 32, and the movable section 331 of the telescopic rod 33 penetrates through the sliding slot 321 and is fastened to the top plate 32 by the fastening member 34. The telescopic rod 33 can be locked at the position between the base 31 and the top plate 32, the oil conservator 8 is well fixed in the circumferential direction, and the telescopic rod 33 is prevented from sliding to influence the fixing effect of the oil conservator 8 in the detection process.
In the above-mentioned fixing device 3, the telescopic rod 33 is an automatic telescopic rod, and the automatic telescopic rod includes an oil cylinder, an air cylinder and an electric cylinder.
In this embodiment, the device for detecting the airtightness of the conservator further comprises a pressure relief device 4 connected to the detection pipeline, and the pressure relief device is used for releasing pressure outwards when the pressure value of the pressure measurement device 2 exceeds a second preset value, so as to ensure that the conservator 8 is always at a normal pressure value.
Referring to fig. 4, the invention further provides a detection method of the device for detecting the airtightness of the conservator, wherein the method comprises the following steps:
In step 130, when the pressure value of the pressure measuring device 2 exceeds a second preset value, the pressure relief device 4 is opened, the gas in the conservator 8 is exhausted, and the pressure relief device 4 is closed until the pressure is reduced to be less than or equal to the second preset value.
The first set value is not a fixed value, the length to be detected of the oil conservator 8 is gradually increased along with the extension of the length to be detected, the corresponding required pressure value under the length to be detected is indicated, and when the pressure value is reached, the air source device 1 stops conveying air to the inflation pipeline, so that the pressure value of the oil conservator 8 is kept in the current state. The first set value is the smallest when the length to be detected is the smallest, the first set value is the largest when the length to be detected is the largest, and the minimum value of the first set value is 20KPa in the application.
The second preset value refers to a pressure value which can be borne by the oil conservator 8 under the corresponding length to be detected, and can also be called as a safety threshold value, once the numerical value of the pressure measuring device 2 exceeds the value, the pressure is required to be relieved through the pressure relieving device 4, the oil conservator 8 is guaranteed to be always at a normal pressure value, namely the pressure value is always kept between the first preset value and the second preset value, and the oil conservator 8 is prevented from being damaged due to over inflation.
The following describes the present embodiment in detail with specific reference to the installation and operation process of the conservator air tightness detecting device.
Preparation process
Preparing a 220V power socket, placing the conservator air tightness detection device at a position close to the transformer breather, closing a valve of the transformer breather, detaching the transformer breather, installing a joint of a corresponding flange connection inflation pipeline and a joint of a detection pipeline, connecting a quick joint of the conservator air tightness detection device at the other ends of the joint of the inflation pipeline and the joint of the detection pipeline, and connecting the conservator air tightness detection device with a power supply.
Procedure of operation
1. And turning on a power supply switch, turning on an indicator lamp, turning on an emergency stop knob, displaying by a pressure gauge, and turning on a breather valve of the transformer.
2. And pressing an air compressor start/stop button to start the air compressor, automatically stopping the air compressor when the pressure of the air compressor reaches 0.7MPa, and repeatedly starting the air compressor.
3. And pressing an inflation start/stop button, starting to detect the pressure of the oil conservator by the oil conservator air tightness detection device, automatically closing the first control valve after inflating for 30 seconds, and automatically opening the second control valve after inflating for 10 seconds to detect the pressure of the oil conservator.
When the pressure is less than 20KPa, the above actions are automatically repeated, when the pressure is more than or equal to 20KPa, the start/stop button of the air compressor is closed, the first control valve is closed, and as long as the pressure is more than or equal to 20KPa, the second control valve is opened.
If the air leakage phenomenon exists, the pressure is less than 20KPa, the second control valve can be automatically closed, at the moment, the inflation start/stop button can be manually pressed, and the first control valve can be opened.
Matters of attention
In the inflation process of the air tightness detection device of the oil conservator, the air compressor is not required to be closed. The maximum measuring range of the pressure measuring device is 100KPa, the pressure measuring device can still normally work under the condition of overload of 120 percent without influencing the accuracy, and the pressure measuring device can bear 200 percent of overload and is not damaged. The inflation time of the conservator air tightness detection device can be adjusted according to the size of the conservator, the pressure of the conservator air tightness detection device needs to be relieved after the conservator air tightness detection device is used up, and the fact that the pressure measurement device displays zero is guaranteed.
It should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The device for detecting the air tightness of the oil conservator is characterized by comprising a fixing device, an air source device and a pressure measuring device;
the fixing device comprises a base, a top plate and a telescopic rod, wherein a movable section and a fixed section of the telescopic rod are respectively connected with the base and the top plate, and the distance between the base and the top plate is equal to the telescopic length of the oil conservator;
the air source device is communicated with an air inlet of the oil conservator through an inflation pipeline, is used for supplying air and pressurizing the oil conservator, and is used for ensuring that two ends of the oil conservator always tightly push the base and the top plate when inflation is finished;
the pressure measuring device is communicated with the air inlet of the oil conservator through a detection pipeline and is used for detecting the pressure value of the gas in the oil conservator so as to stop inflating when the pressure value of the gas is larger than or equal to a first set value.
2. The device for detecting the airtightness of the conservator according to claim 1, wherein a slide rail is arranged on the base, a slide block is arranged at the fixed section of each telescopic rod, the slide block is clamped in the slide rail, a slide groove is arranged on the top plate, and the movable section of each telescopic rod is clamped in the slide groove.
3. The device for detecting the airtightness of the conservator according to claim 2, wherein the sliding groove penetrates through the top plate, and the movable section of the telescopic rod penetrates through the sliding groove and is fastened to the top plate by a fastening member.
4. The device for detecting the airtightness of the conservator according to any one of claims 1 to 3, wherein the telescopic rod is an automatic telescopic rod, and the automatic telescopic rod comprises an oil cylinder, an air cylinder and an electric cylinder.
5. The device for detecting the airtightness of the conservator according to claim 1, further comprising a pressure relief device connected to the detection line for relieving pressure outwards when the pressure value of the pressure measurement device exceeds a second preset value.
6. The conservator airtightness detection device according to claim 1, wherein a dryer is arranged on the inflation pipeline and used for drying the gas entering the conservator.
7. The device for detecting the airtightness of the conservator according to claim 1, wherein a first control valve is arranged on the inflation pipeline between the air source device and the air inlet of the conservator, and a second control valve is arranged on the detection pipeline between the pressure measuring device and the air inlet of the conservator.
8. A detection method using the conservator airtightness detection apparatus according to claim 1, wherein the method comprises:
s1: adjusting the telescopic rod to enable the distance between the base and the top plate to be equal to the length to be detected of the oil conservator;
s2: starting the air source device, and inflating and pressurizing the oil conservator to enable the oil conservator to extend to two ends to tightly prop against the base and the top plate respectively;
s3: the pressure value of the pressure measuring device is obtained in real time, when the pressure value reaches a first preset value, the air source device is closed, and the oil conservator is stopped being inflated;
s4: after the air source device is closed, acquiring a pressure value of the pressure measuring device within a preset time period, and judging whether the oil conservator leaks air according to whether the pressure value changes, so as to finish the detection of the length of the oil conservator to be detected;
s5: and adjusting the telescopic rod, increasing the distance between the base and the top plate, prolonging the length of the conservator to be detected, and repeatedly executing S2-S4 until the detection of the longest length of the conservator to be detected is completed.
9. The method for detecting the airtightness of the conservator, according to claim 8, wherein in step S3, when the pressure value of the pressure measuring device exceeds a second preset value, a pressure relief device is opened to exhaust the gas in the conservator, and the pressure relief device is closed until the pressure drops to be less than or equal to the second preset value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911325971.2A CN111122075A (en) | 2019-12-20 | 2019-12-20 | Device and method for detecting air tightness of oil conservator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911325971.2A CN111122075A (en) | 2019-12-20 | 2019-12-20 | Device and method for detecting air tightness of oil conservator |
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| CN111122075A true CN111122075A (en) | 2020-05-08 |
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| CN201911325971.2A Pending CN111122075A (en) | 2019-12-20 | 2019-12-20 | Device and method for detecting air tightness of oil conservator |
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Cited By (2)
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| CN114061869A (en) * | 2021-11-16 | 2022-02-18 | 广东电网有限责任公司 | Device and method for detecting damage position of oil conservator |
| CN116818222A (en) * | 2023-08-30 | 2023-09-29 | 江苏伟正电气科技有限公司 | Transformer oil conservator capsule gas tightness detection device |
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Application publication date: 20200508 |