CN117723227A - Detection system for oil leakage of on-line monitoring device for dissolved gas in transformer oil - Google Patents
Detection system for oil leakage of on-line monitoring device for dissolved gas in transformer oil Download PDFInfo
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- CN117723227A CN117723227A CN202311595103.2A CN202311595103A CN117723227A CN 117723227 A CN117723227 A CN 117723227A CN 202311595103 A CN202311595103 A CN 202311595103A CN 117723227 A CN117723227 A CN 117723227A
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 160
- 238000001514 detection method Methods 0.000 title claims abstract description 70
- 239000007788 liquid Substances 0.000 claims description 132
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Abstract
The invention discloses a detection system for oil leakage of an online monitoring device for dissolved gas in transformer oil, and relates to the technical field of online monitoring equipment; the oil feeding device comprises a transformer, an oil feeding unit, an on-line monitoring device, an oil return unit, a controller and a quantifying tank, wherein the quantifying tank comprises a first quantifying tank and a second quantifying tank, the first quantifying tank is arranged on the oil feeding unit, the second quantifying tank is arranged on the oil return unit, the transformer is communicated with the on-line monitoring device through the oil feeding unit and an oil tank of the first quantifying tank, the on-line monitoring device is communicated with the transformer through the oil tank of the oil return unit and the oil tank of the second quantifying tank, the controller is used for obtaining the oil feeding amount of an oil sample flowing into the on-line monitoring device through an oil quantity sensor of the first quantifying tank, obtaining the oil outlet amount of the oil sample flowing out of the on-line monitoring device through the quantifying tank, and measuring the oil flowing through the oil tank.
Description
Technical Field
The invention relates to the technical field of online monitoring equipment, in particular to a detection system for oil leakage of an online monitoring device for dissolved gas in transformer oil.
Background
The transformer is the most important main equipment of the power system, and is safe and stable to operate, and has great significance in ensuring safe and stable operation of the power grid. The on-line monitoring device for the dissolved gas in the transformer oil can complete the test of the dissolved gas in the transformer insulating oil several times a day, and is one of the most effective means for monitoring the running state of the transformer. The pipeline of the on-line monitoring device for the dissolved gas in the transformer oil is laid underground, all parts of the on-line monitoring device for the dissolved gas in the transformer oil are sealed in the tank body of the on-line monitoring device for the dissolved gas in the transformer oil, and the on-line monitoring device for the dissolved gas in the transformer oil is not easy to find when the oil leaks. And the leakage of the transformer oil can cause great hidden trouble when the transformer oil level is too low and serious and even the main insulation is affected.
The application publication number is CN115218130A, and the name is a real-time monitoring device for oil leakage of an oil inlet and outlet pipeline. The oil return pipe is provided with a liquid flowmeter to measure the flow in the oil return pipeline, the oil drain pipe is provided with an oil drain valve and the liquid flowmeter to measure the flow velocity in the oil drain pipeline, the flow of the oil return pipe and the flow of the oil drain pipe in a specific time is calculated through the flow velocity and the pipeline sectional area, and fault diagnosis is carried out according to the flow difference. However, this method has the following disadvantages:
1. the online monitoring device for the dissolved gas in the transformer oil is provided with an oil storage tank, in the testing process of the dissolved gas in the oil, the oil quantity flowing into the online monitoring device for the dissolved gas in the transformer oil and the oil quantity flowing out of the online monitoring device for the dissolved gas in the transformer oil are not always equal, for example, insulating oil in an oil sampling link tested by the online monitoring device for the dissolved gas in the transformer oil can flow into the oil storage tank from a transformer through an oil drain pipeline, at the moment, a flowmeter on the oil drain pipeline has an indication, and the flowmeter on an oil return pipeline indicates zero, so that oil leakage condition can be considered to exist according to the calculation of a flow difference value, and misjudgment on the oil leakage condition is caused.
2. The flowmeter is only a metering device for testing the flow in real time, the flow rate in different time periods is different, the flow is calculated by multiplying the simple flow rate by the cross section area and then by the time, the obtained flow in different time periods is different, and the flow cannot be directly used for judging whether oil leaks or not.
The application publication number is CN2015109287571, and the name is a transformer oil tank oil leakage detection alarm device. Through collecting the insulating oil of oil drain groove, flow board, collecting pipe, collection oil tank etc. collection transformer tank wall seepage, when the oil leak reaches the quarter height of collection oil tank, the oil leak will touch micro-gap switch, and control buzzer makes the sound and reminds the staff to in time handle, avoids taking place major accident, and the oil leak that the collecting box was collected can also be recycled simultaneously, avoids extravagant. However, this method has the following disadvantages:
the method cannot collect leakage oil of the on-line monitoring device for the dissolved gas in the transformer oil, because insulating oil in the on-line monitoring device for the dissolved gas in the transformer oil flows out of the oil pipe into the transformer and cannot be collected by the collecting device on the wall of the transformer tank.
Problems and considerations in the prior art:
the pipeline of the on-line monitoring device for the dissolved gas in the transformer oil is laid underground, all parts of the device are sealed inside the tank body, and the on-line monitoring device for the dissolved gas in the transformer oil is not easy to find when the oil leaks. And the leakage of the transformer oil can cause great hidden trouble when the transformer oil level is too low and serious and even the main insulation is affected.
Disclosure of Invention
The invention provides a detection system for oil leakage of an on-line monitoring device for dissolved gas in transformer oil, which solves the technical problem that the oil leakage of the on-line monitoring device for the dissolved gas in the transformer oil is difficult to find.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a detecting system of dissolved gas on-line monitoring device oil leak in transformer oil includes transformer, advance oil unit, on-line monitoring device, the oil return unit, controller and ration jar, the ration jar includes the oil tank and fixes the oil mass sensor on the oil tank and fixes the last liquid level sensor and the lower liquid level sensor in the oil tank, the quantity of ration jar is two, be first ration jar and second ration jar respectively, first ration jar is fixed on advance oil unit, the second ration jar is fixed on the oil return unit, the transformer communicates with on-line monitoring device through advance oil unit and the oil tank of first ration jar, on-line monitoring device communicates with the transformer through advance oil unit and the oil tank of second ration jar, the controller is alone with advance oil unit, on-line monitoring device and oil return unit and each go up liquid level sensor, lower liquid level sensor and oil mass sensor electricity are connected, the controller is used for obtaining the oil mass of the oil sample that flows in on-line monitoring device through the oil mass sensor of first ration jar, obtain the oil sample that flows out from on-line monitoring device through the oil mass sensor of second ration jar, judge oil sample oil yield and oil yield according to the oil feed-in the circumstances.
The further technical proposal is that: the controller obtains the oil quantity before oil sample detection and the oil quantity after oil sample detection in the oil tank through the oil quantity sensor of the first quantitative tank, subtracts the oil quantity after oil sample detection from the oil quantity before oil sample detection to obtain the oil inlet quantity, obtains the oil quantity before oil collection and the oil quantity after oil collection in the oil tank through the oil quantity sensor of the second quantitative tank, subtracts the oil quantity before oil collection from the oil quantity after oil collection to obtain the oil outlet quantity.
The further technical proposal is that: the oil mass sensor is fixedA liquid level transmitter for obtaining the liquid level of the oil in the oil tank, and a controller obtains the liquid level height h before detection through the liquid level transmitter of the first quantitative tank before detection by the on-line monitoring device 2 The controller obtains the liquid level height h before oil collection through the liquid level transmitter of the second quantitative tank 4 After the on-line monitoring device detects, the controller obtains the detected liquid level height h through the liquid level transmitter of the first quantitative tank 1 The controller obtains the liquid level height h after oil collection through the liquid level transmitter of the second quantitative tank 3 The controller detects the height h of the liquid level before the detection by the first quantitative tank 2 Subtracting the detected liquid level height h 1 Multiplying by the cross-sectional area S of the first metering tank 1 Obtain the oil inlet quantity and the liquid level height h after oil collection for the controller 3 Subtracting the height h of the liquid level before oil collection 4 Multiplying by the cross-sectional area S of the second quantitative tank 2 And obtaining the oil yield.
The further technical proposal is that: the oil mass sensor is an electronic scale fixed on the outer side of the bottom of the oil tank and used for obtaining the mass of the oil tank, and the controller obtains the mass G before detection through the electronic scale of the first quantitative tank before detection by the on-line monitoring device 2 The controller obtains the mass G before oil collection through the electronic scale of the second quantitative tank 4 After the on-line monitoring device detects, the controller obtains the detected mass G through the electronic scale of the first quantitative tank 1 The controller obtains the oil-collecting quality G through the electronic scale of the second quantitative tank 3 The controller detects the pre-quality G by using a first quantitative tank 2 Subtracting the detected mass G 1 Obtain oil intake quantity, quality G after oil collection for controller 3 Subtracting the mass G before oil collection 4 And obtaining the oil yield.
The further technical proposal is that: the controller controls the oil inlet unit and the first quantitative tank and enables the transformer and the oil tank of the first quantitative tank to complete oil circulation; the controller controls the oil inlet unit and the first quantitative tank and enables an oil sample in the transformer to be injected into an upper liquid level sensor of the first quantitative tank; the controller controls the oil inlet unit, the first quantitative tank, the on-line monitoring device, the second quantitative tank and the oil return unit, and enables an oil sample in the oil tank of the first quantitative tank to flow into the on-line monitoring device, and the oil sample is collected in the oil tank of the first quantitative tank after flowing out of the on-line monitoring device, so that oil sample detection is completed; the controller controls the second quantitative tank and the oil return unit and enables the oil sample in the oil tank of the second quantitative tank to flow back to the transformer until the oil sample reaches the position of the lower liquid level sensor of the second quantitative tank to finish oil discharge; the online monitoring device is an online monitoring device for dissolved gas in transformer oil; the quantitative tank also comprises a breather and a breather valve, the breather is communicated with the oil tank through the breather valve, and the controller is respectively and independently electrically connected with each breather valve.
The further technical proposal is that: the first quantitative tank comprises a first oil tank, a first oil quantity sensor fixed on the first oil tank, a first upper liquid level sensor and a first lower liquid level sensor fixed in the first oil tank, wherein the first oil quantity sensor is electrically connected and communicated with the controller, the first upper liquid level sensor is electrically connected with the controller, and the first lower liquid level sensor is electrically connected with the controller; the second quantitative tank comprises a second oil tank, a second oil quantity sensor fixed on the second oil tank, a second upper liquid level sensor and a second lower liquid level sensor fixed in the second oil tank, wherein the second oil quantity sensor is electrically connected and communicated with the controller, the second upper liquid level sensor is electrically connected with the controller, and the second lower liquid level sensor is electrically connected with the controller.
The further technical proposal is that: the first quantitative tank further comprises a first breather and a first breather valve, the first breather valve is communicated with the first oil tank through the first breather valve, and the controller is electrically connected with the first breather valve; the second quantitative tank further comprises a second breather and a second breather valve, the second breather valve is communicated with the second oil tank through the second breather valve, and the controller is electrically connected with the second breather valve.
The further technical proposal is that: the first quantitative tank is connected in series with the oil inlet unit, and the oil inlet unit is connected between the transformer and the on-line monitoring device and is used for introducing the oil sample in the transformer into the oil tank of the first quantitative tank and introducing the oil sample in the oil tank of the first quantitative tank into the on-line monitoring device; the second quantitative tank is connected in series with the oil return unit, and the oil return unit is connected between the on-line monitoring device and the transformer and is used for collecting oil samples flowing through the on-line monitoring device to an oil tank of the second quantitative tank and guiding the oil samples in the oil tank of the second quantitative tank back to the transformer.
The further technical proposal is that: the oil inlet unit comprises a first oil pipe, a second oil pipe, a third oil pipe, a first valve, a second valve, a third valve and a first pump, an oil outlet of the transformer is communicated with an oil tank of the first quantitative tank through the first oil pipe, a first oil return port of the transformer is communicated with the oil tank of the first quantitative tank through the second oil pipe, the first valve and the first pump are fixedly connected to the first oil pipe, the second valve is fixedly connected to the second oil pipe, the oil tank of the first quantitative tank is communicated with the on-line monitoring device through the third oil pipe, the third valve is fixedly connected to the third oil pipe, and the controller is respectively and independently connected with the first valve, the second valve, the third valve and the first pump electrically.
The further technical proposal is that: the oil return unit comprises a fourth oil pipe, a fifth oil pipe, a fourth valve, a fifth valve and a second pump, wherein the on-line monitoring device is communicated with an oil tank of the second quantitative tank through the fourth oil pipe, the fourth valve is fixedly connected to the fourth oil pipe, the oil tank of the second quantitative tank is communicated with a second oil return port of the transformer through the fifth oil pipe, the fifth valve and the second pump are fixedly connected to the fifth oil pipe, and the controller is respectively and independently electrically connected with the fourth valve, the fifth valve and the second pump.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in:
first, a detecting system of oil leak of dissolved gas on-line monitoring device in transformer oil includes transformer, advance oil unit, on-line monitoring device, oil return unit, controller and ration jar, the ration jar includes the oil tank and fixes the oil mass sensor on the oil tank and fixes the last liquid level sensor and the lower liquid level sensor in the oil tank, the quantity of ration jar is two, be first ration jar and second ration jar respectively, first ration jar is fixed on advance oil unit, the second ration jar is fixed on the oil return unit, the transformer is through advance oil unit and the oil tank of first ration jar and on-line monitoring device intercommunication, on-line monitoring device is through the oil tank of oil return unit and second ration jar and transformer intercommunication, the controller is alone with advance oil unit, on-line monitoring device and oil return unit and each go up liquid level sensor, lower liquid level sensor and oil mass sensor electricity are connected, the controller is used for obtaining the oil mass of the oil sample that flows in on-line monitoring device through the oil mass sensor of first ration jar, obtain the oil sample's that flows out from on-line monitoring device from the oil sample through the sensor of second ration jar, judge oil sample oil yield and oil sample volume according to the oil sample condition. According to the technical scheme, oil flowing through the oil tank is metered through the quantitative tank, when the oil inlet amount is larger than the oil outlet amount, the condition that oil leakage exists in the on-line monitoring device can be known, and the judgment result is more accurate.
Secondly, install respirator and breather valve for filtration and air-purifying, guarantee that the oil tank work is safer, and the performance is more stable.
See the description of the detailed description section.
Drawings
FIG. 1 is a block diagram of embodiment 1 of the present invention;
FIG. 2 is a schematic block diagram of embodiment 1 of the present invention;
FIG. 3 is a flowchart showing the operation of embodiment 1 of the present invention;
FIG. 4 is a first usage state diagram of embodiment 1 of the present invention;
FIG. 5 is a second usage state diagram of embodiment 1 of the present invention;
FIG. 6 is a third usage state diagram of embodiment 1 of the present invention;
FIG. 7 is a block diagram of embodiment 2 of the present invention;
FIG. 8 is a functional block diagram of embodiment 2 of the present invention;
fig. 9 is a flowchart showing the operation of embodiment 2 of the present invention.
Wherein: 1 transformer, 2 transformer oil dissolved gas on-line monitoring device, 31 first oil tank, 32 first upper liquid level sensor, 33 first lower liquid level sensor, 34 first liquid level transmitter, 35 first breather, 36 first breather valve, 37 first electronic scale, 41 second oil tank, 42 second upper liquid level sensor, 43 second lower liquid level sensor, 44 second liquid level transmitter, 45 second breather, 46 second breather valve, 47 second electronic scale, 51 first oil pipe, 52 second oil pipe, 53 third oil pipe, 54 first valve, 55 second valve, 56 third valve, 57 first pump, 61 fourth oil pipe, 62 fifth oil pipe, 63 fourth valve, 64 fifth valve, 65 second pump.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Example 1:
as shown in fig. 1 to 3, the invention discloses a detection system for oil leakage of an on-line monitoring device for dissolved gas in transformer oil, which comprises a transformer 1, an oil inlet unit, an on-line monitoring device, an oil return unit, a quantitative tank and a controller, wherein the on-line monitoring device is an on-line monitoring device 2 for the dissolved gas in the transformer oil. The quantitative tank comprises an oil tank, an oil quantity sensor fixed on the oil tank, an upper liquid level sensor, a lower liquid level sensor, a breather and a breather valve, wherein the upper liquid level sensor and the lower liquid level sensor are fixed in the oil tank, the oil quantity sensor is a liquid level transmitter fixed in the oil tank and used for obtaining the liquid level of oil, and the breather valve is communicated with the oil tank. The quantity of ration jar is two, is first ration jar and second ration jar respectively, and first ration jar is fixed on the oil feed unit, and the second ration jar is fixed on the oil return unit, and transformer 1 is through the oil tank and the on-line monitoring device intercommunication of oil feed unit and first ration jar, and on-line monitoring device is through the oil tank and the transformer 1 intercommunication of oil return unit and second ration jar. The controller is respectively and independently connected with the oil inlet unit, the on-line monitoring device, the oil return unit, each upper liquid level sensor, each lower liquid level sensor, each oil quantity sensor and each breather valve.
The oil inlet unit is connected between the transformer 1 and the on-line monitoring device and is used for introducing an oil sample in the transformer 1 into an oil tank of the first quantitative tank and introducing the oil sample in the oil tank of the first quantitative tank into the on-line monitoring device; the second quantitative tank is connected in series with an oil return unit, and the oil return unit is connected between the on-line monitoring device and the transformer 1 and is used for collecting oil samples flowing through the on-line monitoring device to an oil tank of the second quantitative tank and guiding the oil samples in the oil tank of the second quantitative tank back to the transformer 1.
The controller is used for obtaining the oil inlet amount of the oil sample flowing into the on-line monitoring device through the oil quantity sensor of the first quantitative tank, obtaining the oil outlet amount of the oil sample flowing out of the on-line monitoring device through the oil quantity sensor of the second quantitative tank, and judging the oil leakage condition according to the oil inlet amount and the oil outlet amount.
Specifically, the controller obtains the oil quantity before oil sample detection and the oil quantity after oil sample detection in the oil tank through the oil quantity sensor of the first quantitative tank, the oil quantity is obtained by subtracting the oil quantity after oil sample detection from the oil quantity before oil sample detection, the controller obtains the oil quantity before oil collection and the oil quantity after oil collection in the oil tank through the oil quantity sensor of the second quantitative tank, and the oil quantity is obtained by subtracting the oil quantity before oil collection from the oil quantity after oil collection.
As shown in fig. 1, embodiment 1 is a structural diagram. The first metering tank comprises a first oil tank 31, a first oil mass sensor (namely, a first liquid level transmitter 34) fixed at the inner bottom of the first oil tank 31, a first upper liquid level sensor 32 and a first lower liquid level sensor 33 which are fixed in the first oil tank, a first breather 35 and a first breather valve 36, wherein the first breather 35 is communicated with the first oil tank 31 through the first breather valve 36 and a sixth oil pipe, namely, the first breather 35 is communicated with the top of the first oil tank 31 through the sixth oil pipe, and the first breather valve 36 is fixedly connected to the sixth oil pipe.
The second quantitative tank comprises a second oil tank 41, a second oil mass sensor (namely, a second liquid level transmitter 44) fixed at the inner bottom of the second oil tank 41, a second upper liquid level sensor 42 and a second lower liquid level sensor 43 which are fixed in the second oil tank, a second breather 45 and a second breather valve 46, wherein the second breather 45 is communicated with the second oil tank 41 through the second breather valve 46 and a seventh oil pipe, namely, the second breather 45 is communicated with the top of the second oil tank 41 through the seventh oil pipe, and the second breather valve 46 is fixedly connected to the seventh oil pipe.
The first quantitative tank and the second quantitative tank have the same structure.
The oil inlet unit comprises a first oil pipe 51, a second oil pipe 52, a third oil pipe 53, a first valve 54, a second valve 55, a third valve 56 and a first pump 57, an oil outlet of the transformer 1 is communicated with an oil tank of a first quantitative tank, namely a first oil tank 31, through the first oil pipe 51, a first oil return port of the transformer 1 is communicated with the oil tank of the first quantitative tank, namely the first oil tank 31, through the second oil pipe 52, the first valve 54 and the first pump 57 are fixedly connected to the first oil pipe 51, the second valve 55 is fixedly connected to the second oil pipe 52, the oil tank of the first quantitative tank, namely the first oil tank 31, is communicated with the on-line monitoring device through the third oil pipe 53, and the third valve 56 is fixedly connected to the third oil pipe 53.
The oil return unit comprises a fourth oil pipe 61, a fifth oil pipe 62, a fourth valve 63, a fifth valve 64 and a second pump 65, the on-line monitoring device is communicated with an oil tank of a second quantitative tank, namely a second oil tank 41, through the fourth oil pipe 61, the fourth valve 63 is fixedly connected to the fourth oil pipe 61, the oil tank of the second quantitative tank, namely the second oil tank 41, is communicated with a second oil return port of the transformer 1 through the fifth oil pipe 62, and the fifth valve 64 and the second pump 65 are fixedly connected to the fifth oil pipe 62.
As shown in fig. 2, the functional block diagram of embodiment 1. The controller is respectively and independently connected with the oil inlet unit, the on-line monitoring device, the oil return unit, each upper liquid level sensor, each lower liquid level sensor, each oil quantity sensor and each breather valve electrically, and specifically comprises the following components:
the controller is electrically connected to the oil inlet unit, i.e. the controller is electrically connected to the control end of the first valve 54, the controller is electrically connected to the control end of the second valve 55, the controller is electrically connected to the control end of the third valve 56, and the controller is electrically connected to the control end of the first pump 57.
The controller is electrically connected with an on-line monitoring device 2, namely the on-line monitoring device 2 for the dissolved gas in the transformer oil.
The controller is electrically connected to the oil return unit, i.e. the controller is electrically connected to the control end of the fourth valve 63, the controller is electrically connected to the control end of the fifth valve 64, and the controller is electrically connected to the control end of the second pump 65.
A controller is electrically connected to each upper level sensor, i.e. the first upper level sensor 32 is electrically connected to the controller and the second upper level sensor 42 is electrically connected to the controller.
The controller is electrically connected to each lower level sensor, i.e. the first lower level sensor 33 is electrically connected to the controller and the second lower level sensor 43 is electrically connected to the controller.
The controller is electrically connected to each of the oil level sensors, specifically, the first oil level sensor 34 is electrically connected to and communicates with the controller, and the second oil level sensor 44 is electrically connected to and communicates with the controller.
A controller is electrically connected to each of the respiratory valves, i.e., the controller is electrically connected to the control end of the first respiratory valve 36 and the controller is electrically connected to the control end of the second respiratory valve 46.
The breather and the breather valve are arranged to filter and purify air, so that the oil tank is safer in work and more stable in performance.
The controller is a single-chip microcomputer, all valves are electric control valves, and the controller, the liquid level sensor, the liquid level transmitter, the valves, the pump, the on-line monitoring device and the corresponding communication connection technology are not described in detail in the prior art.
The system further comprises an oil leakage detection step:
before the detection of the on-line monitoring device, the controller obtains the liquid level height h before the detection through the liquid level transmitter of the first quantitative tank 2 The controller obtains the liquid level height h before oil collection through the liquid level transmitter of the second quantitative tank 4 After the on-line monitoring device detects, the controller obtains the detected liquid level height h through the liquid level transmitter of the first quantitative tank 1 The controller obtains the liquid level height h after oil collection through the liquid level transmitter of the second quantitative tank 3 Control ofDetecting the height h of the liquid level before the use of the first quantitative tank 2 Subtracting the detected liquid level height h 1 Multiplying by the cross-sectional area S of the first metering tank 1 Obtaining oil inlet quantity; oil-collecting post-level height h for controller 3 Subtracting the height h of the liquid level before oil collection 4 Multiplying by the cross-sectional area S of the second quantitative tank 2 Obtaining oil output; and the controller judges the oil leakage condition according to the oil inlet amount and the oil outlet amount. When the oil inlet amount is equal to the oil outlet amount, the fact that the on-line monitoring device does not leak oil is known. And when the oil inlet amount is not equal to the oil outlet amount, acquiring the oil leakage of the online monitoring device.
And if the error is in the measurement error range of the liquid level transmitter and is ignored, the oil inlet amount and the oil outlet amount are considered to be equal.
The oil leakage detection step is inserted in the working process of the system.
As shown in fig. 3, a flow chart of the system operation. The working process comprises the following steps: the first oil tank 31 is used for oil circulation, quantitative oil filling, detection by a monitoring device, oil collection by the second oil tank 41, oil quantity check and oil discharge by the second oil tank 41.
As shown in fig. 4, the first usage state diagram of embodiment 1. The initial state is that the insulating oil in the first oil tank 31 is located between the first upper level sensor 32 and the first lower level sensor 33, and the insulating oil in the second oil tank 41 is located at the second lower level sensor 43.
First tank 31 oil circulation: the controller controls the oil inlet unit and the first metering tank and causes the transformer 1 to complete oil circulation with the oil tank of the first metering tank. The method specifically comprises the following steps.
The controller closes the first breather valve 36 and the third valve 56, and opens the first valve 54, the second valve 55 and the first pump 57, so that the oil in the first oil tank 31 and the oil in the transformer 1 start to circulate, and the oil sample in the first oil tank 31 and the oil sample in the transformer 1 can be ensured to be consistent.
Quantitatively oiling: the controller controls the oil inlet unit and the first quantitative tank and enables the oil sample in the transformer 1 to be injected into the position of the upper liquid level sensor of the first quantitative tank, and before detection by the on-line monitoring device, the controller obtains the liquid level height h before detection through the liquid level transmitter of the first quantitative tank 2 The controller obtains the liquid level height h before oil collection through the liquid level transmitter of the second quantitative tank 4 . The method specifically comprises the following steps.
The controller closes the second valve 55 and the third valve 56, opens the first valve 54, the first breather valve 36 and the first pump 57, injects the insulating oil in the transformer 1 into the first oil tank 31, and when the liquid level reaches the first upper liquid level sensor 32, the first upper liquid level sensor 32 informs the controller, and the controller closes the first pump 57, the first valve 54 and the second valve 55.
As shown in fig. 5, the second usage state diagram of embodiment 1. At this time, the insulating oil in the first oil tank 31 is located at the first upper level sensor 32, and the measured liquid level of the first level transmitter 34 is h 2 The insulating oil in the second oil tank 41 is positioned at the second lower liquid level sensor 43, and the measured liquid level of the second liquid level transmitter 44 is h 4 。
The monitoring device detects and collects oil from the second oil tank 41: the controller controls the oil inlet unit, the first quantitative tank, the on-line monitoring device, the second quantitative tank and the oil return unit, and enables the oil sample in the oil tank of the first quantitative tank to flow into the on-line monitoring device, and the oil sample is collected in the oil tank of the first quantitative tank after flowing out through the on-line monitoring device, so that oil sample detection is completed. After the on-line monitoring device detects, the controller obtains the detected liquid level height h through the liquid level transmitter of the first quantitative tank 1 The controller obtains the liquid level height h after oil collection through the liquid level transmitter of the second quantitative tank 3 . The method specifically comprises the following steps.
The controller opens the third valve 56 and the first breather valve 36 and the first tank 31 supplies oil to the on-line monitoring device 2 for dissolved gas in transformer oil.
The controller closes the second pump 65 and the fifth valve 64, opens the second breather valve 46 and the fourth valve 63, controls the on-line monitoring device 2 for dissolved gas in the transformer oil to start detecting the dissolved gas in the oil, pumps the oil in the first oil tank 31 into the on-line monitoring device 2 for dissolved gas in the transformer oil, and flows the insulating oil in the on-line monitoring device 2 for dissolved gas in the transformer oil in the testing process into the second oil tank 41 through the fourth oil pipe 61.
The detection of the dissolved gas in the transformer oil is finished by the on-line monitoring device 2 and the controller is informed.
As shown in fig. 6, the third usage state diagram of embodiment 1. At this time, the measured liquid level of the first liquid level transmitter 34 is h 1 The measured level of the second level transmitter 44 is h 3 。
And (3) oil mass checking: the controller detects the height h of the liquid level before the detection by the first quantitative tank 2 Subtracting the detected liquid level height h 1 Multiplying by the cross-sectional area S of the first metering tank 1 Obtaining oil inlet quantity; oil-collecting post-level height h for controller 3 Subtracting the height h of the liquid level before oil collection 4 Multiplying by the cross-sectional area S of the second quantitative tank 2 Obtaining oil output; and the controller judges the oil leakage condition according to the oil inlet amount and the oil outlet amount. When the oil inlet amount is equal to the oil outlet amount, the fact that the on-line monitoring device does not leak oil is known. And when the oil inlet amount is not equal to the oil outlet amount, acquiring the oil leakage of the online monitoring device.
The cross-sectional area of the first tank 31 is S 1 The cross-sectional area of the second tank 41 is S 2 All are known parameters obtained by measurement in advance and are input to a controller. In the testing process, the volume of insulating oil entering the on-line monitoring device 2 for dissolved gas in transformer oil is V 1 ＝(h 2 -h 1 )*S 1 In the testing process, the volume of the insulating oil flowing out of the online monitoring device 2 for the dissolved gas in the transformer oil is V 2 ＝(h 3 -h 4 )*S 2 . Comparative V 1 And V is equal to 2 The size of the device can find whether the oil leakage exists in the on-line monitoring device 2 for the dissolved gas in the transformer oil. The above formula is input to the controller in advance.
The second oil tank 41 discharges oil: the controller controls the second quantitative tank and the oil return unit and causes the oil sample in the oil tank of the second quantitative tank to flow back to the transformer 1 until the oil sample is discharged to the lower liquid level sensor of the second quantitative tank. The method specifically comprises the following steps.
The controller opens the fifth valve 64, the second pump 65 and the second breather valve 46, the controller closes the fourth valve 63, the insulating oil in the second oil tank 41 flows into the transformer 1, and when the oil level in the second oil tank 41 reaches or falls below the second lower level sensor 43, the controller closes the fifth valve 64, the second pump 65, the second breather valve 46 and the fourth valve 63, and the oil discharge ends.
According to the technical scheme, oil flowing through the oil tank is metered through the quantitative tank, when the oil quantity flowing out of the transformer 1 is far greater than the oil quantity flowing back to the transformer 1, the oil leakage of the online monitoring device is illustrated, and the technical problem that the oil leakage of the online monitoring device cannot be found is solved.
Example 2:
embodiment 2 differs from embodiment 1 in that the oil amount sensor is an electronic scale fixed to the outside of the bottom of the oil tank for obtaining the quality of the oil tank.
As shown in fig. 7 to 9, the invention discloses a detection system for oil leakage of an on-line monitoring device for dissolved gas in transformer oil, which comprises a transformer 1, an oil inlet unit, an on-line monitoring device, an oil return unit, a quantitative tank and a controller, wherein the on-line monitoring device is the on-line monitoring device 2 for dissolved gas in transformer oil, the quantitative tank comprises an oil tank, an oil quantity sensor fixed on the oil tank, an upper liquid level sensor and a lower liquid level sensor fixed in the oil tank, a breather and a breather valve, and the oil quantity sensor is an electronic scale fixed at the outer side of the bottom of the oil tank and used for obtaining the quality of the oil tank, and the same points are not repeated.
As shown in fig. 7, the structure of embodiment 2. The electronic scale of the first quantitative tank is that the first electronic scale 37 is fixed on the outer side of the bottom of the first oil tank 31, and the electronic scale of the second quantitative tank is that the second electronic scale 47 is fixed on the outer side of the bottom of the second oil tank 41. The lines to the right of the first pump 57, to the right of the second valve 55, and to the left of the third valve 56 are provided as hoses, and the lines to the right of the second pump 65 and to the left of the fourth valve 63 are provided as hoses. The same points are not described in detail.
As shown in fig. 8, the functional block diagram of embodiment 2. The controller is electrically connected to each of the oil mass sensors, specifically, the first oil mass sensor, i.e., the first electronic scale 37, is electrically connected to and communicates with the controller, and the second oil mass sensor, i.e., the second electronic scale 47, is electrically connected to and communicates with the controller. The same points are not described in detail.
The controller is a single-chip microcomputer, all valves are electric control valves, and the controller, the liquid level sensor, the electronic scale, the valves, the pump, the on-line monitoring device and the corresponding communication connection technology are not described in detail in the prior art.
The system further comprises an oil leakage detection step:
before the detection of the on-line monitoring device, the controller obtains the mass G before the detection through the electronic scale of the first quantitative tank 2 The controller obtains the mass G before oil collection through the electronic scale of the second quantitative tank 4 After the on-line monitoring device detects, the controller obtains the detected mass G through the electronic scale of the first quantitative tank 1 The controller obtains the oil-collecting quality G through the electronic scale of the second quantitative tank 3 The controller detects the pre-quality G by using a first quantitative tank 2 Subtracting the detected mass G 1 Obtain oil intake quantity, quality G after oil collection for controller 3 Subtracting the mass G before oil collection 4 Obtaining oil output; and the controller judges the oil leakage condition according to the oil inlet amount and the oil outlet amount. When the oil inlet amount is equal to the oil outlet amount, the fact that the on-line monitoring device does not leak oil is known. And when the oil inlet amount is not equal to the oil outlet amount, acquiring the oil leakage of the online monitoring device.
And if the error is in the measurement error range of the electronic scale and is ignored, the oil inlet amount and the oil outlet amount are considered to be equal.
The oil leakage detection step is inserted in the working process of the system.
As shown in fig. 9, a flowchart of the operation of the system of example 2. The working process comprises the following steps: the first oil tank 31 is used for oil circulation, quantitative oil filling, detection by a monitoring device, oil collection by the second oil tank 41, oil quantity check and oil discharge by the second oil tank 41.
The initial state is that the insulating oil in the first oil tank 31 is located between the first upper level sensor 32 and the first lower level sensor 33, and the insulating oil in the second oil tank 41 is located at the second lower level sensor 43.
First tank 31 oil circulation: the controller controls the oil inlet unit and the first metering tank and causes the transformer 1 to complete oil circulation with the oil tank of the first metering tank. The same points are not described in detail.
Quantitatively oiling: the controller controls the oil inlet unit and the first metering tank and enables the oil sample in the transformer 1 to be injected into the position of the upper liquid level sensor of the first metering tank,before the detection of the on-line monitoring device, the controller obtains the mass G before the detection through the electronic scale of the first quantitative tank 2 The controller obtains the mass G before oil collection through the electronic scale of the second quantitative tank 4 . The same points are not described in detail.
At this time, the insulating oil in the first oil tank 31 is located at the first upper level sensor 32, and the first electronic scale 37 is denoted by G 2 The insulating oil in the second oil tank 41 is positioned at the second lower liquid level sensor 43, and the second electronic scale 47 is denoted by G 4 。
The monitoring device detects and collects oil from the second oil tank 41: the controller controls the oil inlet unit, the first quantitative tank, the on-line monitoring device, the second quantitative tank and the oil return unit, and enables the oil sample in the oil tank of the first quantitative tank to flow into the on-line monitoring device, and the oil sample is collected in the oil tank of the first quantitative tank after flowing out through the on-line monitoring device, so that oil sample detection is completed. After the on-line monitoring device detects, the controller obtains the detected mass G through the electronic scale of the first quantitative tank 1 The controller obtains the oil-collecting quality G through the electronic scale of the second quantitative tank 3 . The same points are not described in detail.
The detection of the dissolved gas in the transformer oil is finished by the on-line monitoring device 2 and the controller is informed.
At this time, the first electronic scale 37 is denoted by G 1 The second electronic scale 47 has a G indication 3 。
And (3) oil mass checking: the controller detects the front mass G by using a first quantitative tank 2 Subtracting the detected mass G 1 Obtain oil intake quantity, quality G after oil collection for controller 3 Subtracting the mass G before oil collection 4 Obtaining oil output; and the controller judges the oil leakage condition according to the oil inlet amount and the oil outlet amount. When the oil inlet amount is equal to the oil outlet amount, the fact that the on-line monitoring device does not leak oil is known. And when the oil inlet amount is not equal to the oil outlet amount, acquiring the oil leakage of the online monitoring device.
In the test process, the mass of the insulating oil entering the monitoring device is G 2 -G 1 The mass of the insulating oil flowing out of the monitoring device is G 3 -G 4 . Comparing the two sizes can find out whether the monitoring device leaks oil.
The second oil tank 41 discharges oil: the controller controls the second quantitative tank and the oil return unit and causes the oil sample in the oil tank of the second quantitative tank to flow back to the transformer 1 until the oil sample is discharged to the lower liquid level sensor of the second quantitative tank. The same points are not described in detail.
Example 3:
the invention discloses a detection system for oil leakage of an online monitoring device for dissolved gas in transformer oil, which comprises a transformer 1, an oil inlet unit, an online monitoring device, an oil return unit, a quantitative tank and a controller, wherein the online monitoring device is an online monitoring device 2 for the dissolved gas in the transformer oil. The quantitative tank comprises an oil tank, an oil quantity sensor fixed on the oil tank, an upper liquid level sensor and a lower liquid level sensor fixed in the oil tank, wherein the oil quantity sensor is a liquid level transmitter fixed in the oil tank and used for obtaining the liquid level of oil. The quantity of ration jar is two, is first ration jar and second ration jar respectively, and first ration jar is fixed on the oil feed unit, and the second ration jar is fixed on the oil return unit, and transformer 1 is through the oil tank and the on-line monitoring device intercommunication of oil feed unit and first ration jar, and on-line monitoring device is through the oil tank and the transformer 1 intercommunication of oil return unit and second ration jar. The controller is respectively and independently connected with the oil inlet unit, the on-line monitoring device, the oil return unit, each upper liquid level sensor, each lower liquid level sensor and each oil quantity sensor.
The controller is used for obtaining the oil inlet amount of the oil sample flowing into the on-line monitoring device through the oil quantity sensor of the first quantitative tank, obtaining the oil outlet amount of the oil sample flowing out of the on-line monitoring device through the oil quantity sensor of the second quantitative tank, and judging the oil leakage condition according to the oil inlet amount and the oil outlet amount.
The breather and the breather valve are removed, the oil flowing through the oil tank can still be metered through the quantitative tank, and when the oil quantity flowing out of the transformer 1 is larger than the oil quantity flowing back to the transformer 1, the oil leakage of the online monitoring device is proved, so that the technical problem that the oil leakage of the online monitoring device cannot be found is solved.
Claims (10)
1. The utility model provides a detection system of gaseous on-line monitoring device oil leak in transformer oil, includes transformer (1), oil feed unit, on-line monitoring device, oil return unit and controller, its characterized in that: the oil tank is characterized by further comprising a quantitative tank, wherein the quantitative tank comprises an oil tank and an oil quantity sensor fixed on the oil tank, an upper liquid level sensor and a lower liquid level sensor fixed in the oil tank, the quantitative tank is two in number and is respectively a first quantitative tank and a second quantitative tank, the first quantitative tank is fixed on an oil inlet unit, the second quantitative tank is fixed on an oil return unit, the transformer (1) is communicated with an on-line monitoring device through the oil inlet unit and the oil tank of the first quantitative tank, the on-line monitoring device is communicated with the transformer (1) through the oil tank of the oil return unit and the oil tank of the second quantitative tank, and a controller is respectively and independently connected with the oil inlet unit, the on-line monitoring device and the oil return unit, and each upper liquid level sensor, each lower liquid level sensor and each oil quantity sensor.
2. The detection system for oil leakage of an online monitoring device for dissolved gas in transformer oil according to claim 1, wherein the detection system comprises: the controller obtains the oil quantity before oil sample detection and the oil quantity after oil sample detection in the oil tank through the oil quantity sensor of the first quantitative tank, subtracts the oil quantity after oil sample detection from the oil quantity before oil sample detection to obtain the oil inlet quantity, obtains the oil quantity before oil collection and the oil quantity after oil collection in the oil tank through the oil quantity sensor of the second quantitative tank, subtracts the oil quantity before oil collection from the oil quantity after oil collection to obtain the oil outlet quantity.
3. The detection system for oil leakage of an online monitoring device for dissolved gas in transformer oil according to claim 2, wherein the detection system comprises: the oil quantity sensor is a liquid level transmitter fixed in the oil tank and used for obtaining the liquid level of oil, and the controller obtains the liquid level height h before detection through the liquid level transmitter of the first quantitative tank before detection by the on-line monitoring device 2 The controller obtains the liquid level height h before oil collection through the liquid level transmitter of the second quantitative tank 4 After the on-line monitoring device detects, the controller passes through the first quantitativeThe liquid level transmitter of the tank obtains the detected liquid level height h 1 The controller obtains the liquid level height h after oil collection through the liquid level transmitter of the second quantitative tank 3 The controller detects the height h of the liquid level before the detection by the first quantitative tank 2 Subtracting the detected liquid level height h 1 Multiplying by the cross-sectional area S of the first metering tank 1 Obtain the oil inlet quantity and the liquid level height h after oil collection for the controller 3 Subtracting the height h of the liquid level before oil collection 4 Multiplying by the cross-sectional area S of the second quantitative tank 2 And obtaining the oil yield.
4. The detection system for oil leakage of an online monitoring device for dissolved gas in transformer oil according to claim 2, wherein the detection system comprises: the oil mass sensor is an electronic scale fixed on the outer side of the bottom of the oil tank and used for obtaining the mass of the oil tank, and the controller obtains the mass G before detection through the electronic scale of the first quantitative tank before detection by the on-line monitoring device 2 The controller obtains the mass G before oil collection through the electronic scale of the second quantitative tank 4 After the on-line monitoring device detects, the controller obtains the detected mass G through the electronic scale of the first quantitative tank 1 The controller obtains the oil-collecting quality G through the electronic scale of the second quantitative tank 3 The controller detects the pre-quality G by using a first quantitative tank 2 Subtracting the detected mass G 1 Obtain oil intake quantity, quality G after oil collection for controller 3 Subtracting the mass G before oil collection 4 And obtaining the oil yield.
5. The detection system for oil leakage of an online monitoring device for dissolved gas in transformer oil according to claim 1, wherein the detection system comprises: the controller controls the oil inlet unit and the first quantitative tank and enables the transformer (1) and the oil tank of the first quantitative tank to complete oil circulation; the controller controls the oil inlet unit and the first quantitative tank and enables an oil sample in the transformer (1) to be injected to an upper liquid level sensor of the first quantitative tank; the controller controls the oil inlet unit, the first quantitative tank, the on-line monitoring device, the second quantitative tank and the oil return unit, and enables an oil sample in the oil tank of the first quantitative tank to flow into the on-line monitoring device, and the oil sample is collected in the oil tank of the first quantitative tank after flowing out of the on-line monitoring device, so that oil sample detection is completed; the controller controls the second quantitative tank and the oil return unit and enables the oil sample in the oil tank of the second quantitative tank to flow back to the transformer (1) until the oil sample reaches the position of the lower liquid level sensor of the second quantitative tank to finish oil discharge; the online monitoring device is an online monitoring device (2) for dissolved gas in transformer oil; the quantitative tank also comprises a breather and a breather valve, the breather is communicated with the oil tank through the breather valve, and the controller is respectively and independently electrically connected with each breather valve.
6. The detection system for oil leakage of an online monitoring device for dissolved gas in transformer oil according to claim 1, wherein the detection system comprises: the first quantitative tank comprises a first oil tank (31), a first oil quantity sensor fixed on the first oil tank (31), a first upper liquid level sensor (32) and a first lower liquid level sensor (33) fixed in the first oil tank, wherein the first oil quantity sensor is electrically connected and communicated with the controller, the first upper liquid level sensor (32) is electrically connected with the controller, and the first lower liquid level sensor (33) is electrically connected with the controller; the second quantitative tank comprises a second oil tank (41), a second oil quantity sensor fixed on the second oil tank (41), a second upper liquid level sensor (42) and a second lower liquid level sensor (43) which are fixed in the second oil tank, wherein the second oil quantity sensor is electrically connected and communicated with the controller, the second upper liquid level sensor (42) is electrically connected with the controller, and the second lower liquid level sensor (43) is electrically connected with the controller.
7. The detection system for oil leakage of an online monitoring device for dissolved gas in transformer oil according to claim 6, wherein: the first quantitative tank further comprises a first breather (35) and a first breather valve (36), the first breather (35) is communicated with the first oil tank (31) through the first breather valve (36), and the controller is electrically connected with the first breather valve (36); the second quantitative tank further comprises a second breather (45) and a second breather valve (46), the second breather (45) is communicated with the second oil tank (41) through the second breather valve (46), and the controller is electrically connected with the second breather valve (46).
8. The detection system for oil leakage of an online monitoring device for dissolved gas in transformer oil according to claim 1, wherein the detection system comprises: the first quantitative tank is connected in series with the oil inlet unit, and the oil inlet unit is connected between the transformer (1) and the on-line monitoring device and is used for introducing an oil sample in the transformer (1) into an oil tank of the first quantitative tank and introducing the oil sample in the oil tank of the first quantitative tank into the on-line monitoring device; the second quantitative tank is connected in series with an oil return unit, and the oil return unit is connected between the on-line monitoring device and the transformer (1) and is used for collecting oil samples flowing through the on-line monitoring device to an oil tank of the second quantitative tank and guiding the oil samples in the oil tank of the second quantitative tank back to the transformer (1).
9. The detection system for oil leakage of an online monitoring device for dissolved gas in transformer oil according to claim 1, wherein the detection system comprises: the oil inlet unit comprises a first oil pipe (51), a second oil pipe (52), a third oil pipe (53), a first valve (54), a second valve (55), a third valve (56) and a first pump (57), an oil outlet of the transformer (1) is communicated with an oil tank of a first metering tank through the first oil pipe (51), a first oil return port of the transformer (1) is communicated with the oil tank of the first metering tank through the second oil pipe (52), the first valve (54) and the first pump (57) are fixedly connected to the first oil pipe (51), the second valve (55) is fixedly connected to the second oil pipe (52), the oil tank of the first metering tank is communicated with an on-line monitoring device through the third oil pipe (53), and the third valve (56) is fixedly connected to the third oil pipe (53), and the controller is respectively and independently connected with the first valve (54), the second valve (55), the third valve (56) and the first pump (57) electrically.
10. The detection system for oil leakage of an online monitoring device for dissolved gas in transformer oil according to claim 1, wherein the detection system comprises: the oil return unit comprises a fourth oil pipe (61), a fifth oil pipe (62), a fourth valve (63), a fifth valve (64) and a second pump (65), wherein the on-line monitoring device is communicated with an oil tank of a second quantitative tank through the fourth oil pipe (61), the fourth valve (63) is fixedly connected to the fourth oil pipe (61), the oil tank of the second quantitative tank is communicated with a second oil return port of the transformer (1) through the fifth oil pipe (62), the fifth valve (64) and the second pump (65) are fixedly connected to the fifth oil pipe (62), and the controller is respectively and independently connected with the fourth valve (63), the fifth valve (64) and the second pump (65) electrically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311595103.2A CN117723227A (en) | 2023-11-27 | 2023-11-27 | Detection system for oil leakage of on-line monitoring device for dissolved gas in transformer oil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311595103.2A CN117723227A (en) | 2023-11-27 | 2023-11-27 | Detection system for oil leakage of on-line monitoring device for dissolved gas in transformer oil |
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| CN117723227A true CN117723227A (en) | 2024-03-19 |
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| CN202311595103.2A Pending CN117723227A (en) | 2023-11-27 | 2023-11-27 | Detection system for oil leakage of on-line monitoring device for dissolved gas in transformer oil |
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| Country | Link |
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| CN (1) | CN117723227A (en) |
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