CN114858649A - Device and method for measuring generation tendency and dissipation rate of transformer oil foam - Google Patents
Device and method for measuring generation tendency and dissipation rate of transformer oil foam Download PDFInfo
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- CN114858649A CN114858649A CN202110171327.5A CN202110171327A CN114858649A CN 114858649 A CN114858649 A CN 114858649A CN 202110171327 A CN202110171327 A CN 202110171327A CN 114858649 A CN114858649 A CN 114858649A
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- 239000006260 foam Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 238000007872 degassing Methods 0.000 abstract description 2
- 230000018044 dehydration Effects 0.000 abstract description 2
- 238000006297 dehydration reaction Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract 3
- 239000003921 oil Substances 0.000 description 85
- 238000001914 filtration Methods 0.000 description 5
- 239000010687 lubricating oil Substances 0.000 description 4
- 230000003254 anti-foaming effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
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- Chemical & Material Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- Engineering & Computer Science (AREA)
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- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
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- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
A measuring device and method for transformer oil foam generation tendency and dissipation rate, wherein the measuring device comprises: the device comprises a box body, a system controller, a vacuum pump, an empty buffer tank and a constant temperature box, wherein the vacuum pump is connected with the box body; a vacuum buffer tank and a thermostat are arranged in the box body, and the vacuum buffer tank is connected with a vacuum pump through a vacuum pipeline; the vacuum buffer tank is provided with an oil discharge valve, an emptying valve and a vacuum pressure sensor; the thermostat is provided with a first metering cylinder, a second metering cylinder and a liquid level sensor, and the first metering cylinder is provided with the liquid level sensor; the system controller is controlled by a control circuit and is respectively connected with the vacuum pump, the vacuum pressure sensor, the thermostat, the oil discharge valve, the emptying valve and the vacuum valve. The measurement result of the measurement device can better reflect the foam generation state of the transformer oil under the vacuum dehydration and degassing process condition, and the numerical value of the measurement result directly reflects the generation and dissipation rate of the foam layer when the transformer oil is filtered in vacuum.
Description
Technical Field
The invention relates to a measuring device for the generation tendency and the dissipation rate of transformer oil foam, belonging to the technical field of transformer oil use performance evaluation
Background
Before the transformer oil is injected into power equipment, vacuum oil filtration is needed to remove moisture and dissolved gas in the oil so as to improve the insulating strength of the oil. The oil is dissolved with moisture and a large amount of air, and under the high vacuum of the vacuum filtered oil, the moisture is vaporized and a large amount of air overflows from the liquid, and carries a large amount of liquid to generate a foam layer. The cleanliness and aging of the transformer oil and the pollution of other materials all affect the volume and the dissipation rate of a foam layer of the vacuum filter oil of the transformer oil. Excessive foam and extremely slow dissipation rate can cause the vacuum oil filtering equipment to work abnormally, seriously influence the treatment efficiency of transformer oil, and then influence the progress of transformer manufacturing.
At present, no special equipment and method for evaluating the generation amount of vacuum foam of transformer oil exists at home and abroad. In the lubricating oil industry, there is an apparatus and method for testing the anti-foaming performance of lubricating oil. The main principle of the equipment is as follows: under normal pressure and at a proper temperature, air with a certain speed is introduced into the oil, a large amount of liquid carried by air bubbles overflows to generate a foam layer, the height of the foam layer and the dissipation speed are high and low, so that the foam generation and dissipation speed after mechanical stirring and vibration of lubrication are evaluated, and the lubricating performance of the lubricating oil is prevented from being influenced. The equipment and the method for evaluating the anti-foaming performance of the lubricating oil are completely inconsistent with the actual working conditions of the vacuum oil filtering of the transformer oil, the evaluation result of the equipment and the method is difficult to reflect the actual conditions of the vacuum oil filtering of the transformer oil, and the equipment and the method are also not suitable for evaluating the foam generation amount and the dissipation rate of the transformer oil in a vacuum state.
Aiming at the defects of the existing method for evaluating the use performance of the transformer oil. It is required to develop a measuring device and a method for the generation tendency and the dissipation rate of the transformer oil foam in the vacuum state. The method is used for the inspection and quality control of the use performance of the transformer oil.
Disclosure of Invention
The invention aims to solve the technical problem of providing a measuring device for the generation tendency and the dissipation rate of transformer oil foam, which is characterized by comprising the following components:
a box body;
the system controller is arranged at the lower part of the outer surface of the box body;
the vacuum pump is connected with the box body;
a vacuum buffer tank and a thermostat are arranged in the box body, and the vacuum buffer tank is connected with the vacuum pump through a vacuum pipeline;
the vacuum buffer tank is provided with an oil discharge valve, an emptying valve and a vacuum pressure sensor;
the thermostat is provided with a first metering cylinder, a second metering cylinder and a liquid level sensor, the first metering cylinder is connected with the second metering cylinder, the second metering cylinder is connected with the vacuum buffer tank, and the first metering cylinder is provided with the liquid level sensor;
the system controller is controlled by a control circuit and is respectively connected with the vacuum pump, the vacuum pressure sensor, the thermostat, the oil discharge valve, the emptying valve and the vacuum valve.
In an embodiment, a first plug is arranged at an inlet of the first metering cylinder, a second plug is arranged at an inlet of the second metering cylinder, an oil inlet pipeline is arranged between the first metering cylinder and the second metering cylinder, one end of the oil inlet pipeline penetrates through the first plug and enters the first metering cylinder, the other end of the oil inlet pipeline penetrates through the second plug and enters the second metering cylinder, and an oil inlet valve is arranged on the oil inlet pipeline.
In one embodiment, the oil inlet valve is connected to the system controller through the control line.
In one embodiment, the vacuum line is provided with the vacuum pressure sensor and the vacuum valve.
In one embodiment, the oil discharge valve, the air release valve, the vacuum valve and the oil inlet valve are in an electromagnetic valve structure.
The invention also provides a method for measuring the generation tendency and the dissipation rate of the transformer oil foam in the vacuum state, which comprises the following steps:
step S1, pouring untreated transformer oil into a first metering cylinder, connecting the first metering cylinder with a second metering cylinder through an oil inlet pipeline provided with an oil inlet valve, and connecting the second metering cylinder with a vacuum buffer tank through a vacuum pipeline, wherein the vacuum buffer tank is connected with a vacuum pump;
step S2, placing the first measuring cylinder and the second measuring cylinder in a thermostat;
step S3, setting the temperature of the thermostat, closing the oil inlet valve, opening the vacuum valve, and closing the emptying valve and the oil discharge valve;
step S4, starting a vacuum pump, and vacuumizing the vacuum buffer tank to a vacuum degree;
step S5, when the vacuum buffer tank reaches the vacuum degree, the vacuum buffer tank stops being vacuumized, the oil inlet valve is opened, the transformer oil in the first metering cylinder is injected into the second metering cylinder, and the volume V of the transformer oil injected into the second metering cylinder is recorded 0 ml；
Step S6, when the foam layer of the second metering cylinder is not raised any more, recording the sum V of the volume of the foam layer in the second metering cylinder and the volume of the transformer oil max ml；
Step S7, recording the time T min for the foam layer to dissipate completely; calculate the foam tendency and the foam layer dissipation rate, foam tendency ═ V max -V 0 )÷V 0 Foam layer dissipation rate ═ V max -V 0 )÷T。
The measuring result of the measuring device can reflect the foam generation state of the transformer oil under the vacuum dehydration and degassing process condition, the value of the value directly reflects the foam layer generation and dissipation rate of the transformer oil during vacuum oil filtering, and an effective measuring device is provided for evaluating the quality of the transformer oil and whether the transformer oil is polluted.
Drawings
Fig. 1 is a schematic structural diagram of a measuring apparatus according to the present invention.
Wherein the reference numerals are:
1 a system controller;
2 oil drain valve
3 vacuum pump
4 vacuum buffer tank
5 atmospheric valve
6 vacuum valve
7 vacuum pressure sensor
8 first measuring cylinder
9 first plug
10 oil inlet valve
11 second stopper
12 second measuring cylinder
13 constant temperature cabinet
14 level sensor.
Detailed Description
The detailed description and technical contents of the invention are described as follows with the accompanying drawings: the invention is further described with reference to the following figures and examples: the following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Referring to fig. 1, the present invention provides a measuring device for a generating tendency and a dissipation rate of transformer oil foam, comprising: the device comprises a box body 100, a system controller 1, a vacuum pump 3, an empty buffer tank and a constant temperature box 13, wherein the system controller 1 is arranged at the lower part of the outer surface of the box body 100 or can be arranged on a base for supporting the box body 100; a vacuum pump 3 connected to the tank 100; a vacuum buffer tank 4 and a thermostat 13 are arranged in the box body 100, and the vacuum buffer tank 4 is connected with the vacuum pump 3 through a vacuum pipeline; the vacuum buffer tank 4 is provided with an oil discharge valve 2, an emptying valve 5 and a vacuum pressure sensor 7; the thermostat 13 is provided with a first metering cylinder 8, a second metering cylinder 12 and a liquid level sensor 14, the first metering cylinder 8 is connected with the second metering cylinder 12, the second metering cylinder 12 is connected with the vacuum buffer tank 4, and the first metering cylinder 8 is provided with the liquid level sensor 14; the system controller 1 is controlled by a control line and is respectively connected with the vacuum pump 3, the vacuum pressure sensor 7, the thermostat 13, the oil discharge valve 2, the emptying valve 5 and the vacuum valve 6.
8 entrances of first metering cylinder are equipped with first stopper 9, 12 entrances of second metering cylinder are equipped with second stopper 11, be equipped with one between 8 of first metering cylinder and the second metering cylinder 12 and advance oil pipe line, advance oil pipe line one end and pass through first stopper 9 and get into in the first metering cylinder 8, the other end passes through second stopper 11 and gets into in the second metering cylinder 12, advance to be equipped with inlet valve 10 on the oil pipe line, inlet valve 10 passes through control scheme with system controller 1 connects. The oil discharge valve 2, the emptying valve 5, the vacuum valve 6 and the oil inlet valve 10 are in electromagnetic valve structures.
The system controller 1 vacuumizes the vacuum buffer tank 4 through the control circuit vacuum pump 3, displays and controls the vacuum degree of the vacuum buffer tank 4 through the vacuum pressure sensor 7 at any time, and controls the temperature of the circuit thermostat 13 and the on-off control of the oil discharge valve 2, the emptying valve 5, the vacuum valve 6 and the oil inlet valve 10.
The measuring device is suitable for measuring the volume of liquid entering the measuring cylinder and the volume of the highest position of the foam layer under the vacuum condition at 60 ℃, calculating the difference value of the volume and the volume, and directly reflecting the foam production tendency of the transformer oil under the vacuum condition.
The invention provides a method for measuring the generation tendency and the dissipation rate of transformer oil foam in a vacuum state, which comprises the following steps:
step S1, pouring untreated transformer oil into a first metering cylinder, connecting the first metering cylinder with a second metering cylinder through an oil inlet pipeline provided with an oil inlet valve, and connecting the second metering cylinder with a vacuum buffer tank through a vacuum pipeline, wherein the vacuum buffer tank is connected with a vacuum pump;
step S2, placing the first measuring cylinder and the second measuring cylinder in a thermostat;
step S3, setting the temperature of the thermostat, closing the oil inlet valve, opening the vacuum valve, and closing the emptying valve and the oil discharge valve;
step S4, starting a vacuum pump, and vacuumizing the vacuum buffer tank to a vacuum degree;
step S5, when the vacuum buffer tank reaches the endWhen the vacuum degree is reached, the vacuum buffer tank is stopped being vacuumized, the oil inlet valve is opened, the transformer oil in the first metering cylinder is injected into the second metering cylinder, and the volume V of the transformer oil injected into the second metering cylinder is recorded 0 ml；
Step S6, when the foam layer of the second metering cylinder is not raised any more, recording the sum V of the volume of the foam layer in the second metering cylinder and the volume of the transformer oil max ml；
Step S7, recording the time T min for the foam layer to dissipate completely; calculate the foam tendency and the foam layer dissipation rate, foam tendency ═ V max -V 0 )÷V 0 Foam layer dissipation rate ═ V max -V 0 )÷T。
In a specific application scenario of the application, the specific operation steps of measuring the foam layer dissipation rate and the foam tendency of the transformer oil by using the device are as follows:
firstly, cleaning and drying a first plug 9, a second plug 11, a first metering cylinder 8 and a second metering cylinder 12 which are connected with a vacuum tube for standby, wherein the first metering cylinder 8 is used for placing a sample, and the second metering cylinder 12 is used for measuring;
step two, pouring a proper amount of transformer oil which is not subjected to vacuum degassing treatment into a first metering cylinder 8, and plugging a first plug 9 of an oil inlet pipeline of an oil inlet valve 10; the second metering cylinder 12 is provided with a second plug 11, and the oil inlet pipeline extends into a proper position of the second metering cylinder 12 through the second plug 11. One end of the vacuum line extends into the second metering cylinder 12 through the second plug 11, and the other end of the vacuum line is connected with the vacuum buffer tank 4 through the vacuum valve 6. The assembled first measuring cylinder 8 and second measuring cylinder 12 are placed in a thermostat 13.
And step three, setting the temperature of the constant temperature box 13 to be 60 ℃, wherein the oil inlet valve 10 is closed, the vacuum valve 6 is opened, and the emptying valve 5 and the oil discharge valve 2 are in a closed state.
And step four, setting the vacuum degree on the system controller 1 to be 100Pa, starting the vacuum pump 3 and vacuumizing the vacuum buffer tank 4.
And step five, when the vacuum degree of the vacuum buffer tank 4 reaches 100Pa, closing the vacuum valve 6, opening the oil inlet valve 10, enabling 100ml (recorded as V0) of transformer oil sample in the first metering cylinder 8 to enter the second metering cylinder 12, simultaneously generating foam, after the 100ml of transformer oil enters, closing the oil inlet valve 10, and when the foam layer in the second metering cylinder 12 does not rise any more, recording the total volume V1 of the foam and the oil sample in the second metering cylinder 12. And (5) opening an emptying valve 5, closing the vacuum pump 3, opening a vacuum valve 6 and emptying the second metering cylinder 12 after detection is finished.
Step six, according to a formula: tendency to foam (V) max -V 0 )÷V 0 X 100% and the foam layer dissipation rate (V) max -V 0 ) T, calculate the result.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications may be made without departing from the invention, and such modifications are intended to be included within the scope of the invention.
Claims (6)
1. A device for measuring the tendency to foam generation and the rate of dissipation of transformer oil, comprising:
a box body;
the system controller is arranged at the lower part of the outer surface of the box body;
the vacuum pump is connected with the box body;
a vacuum buffer tank and a thermostat are arranged in the box body, and the vacuum buffer tank is connected with the vacuum pump through a vacuum pipeline;
the vacuum buffer tank is provided with an oil discharge valve, an emptying valve and a vacuum pressure sensor;
the thermostat is provided with a first metering cylinder, a second metering cylinder and a liquid level sensor, the first metering cylinder is connected with the second metering cylinder, the second metering cylinder is connected with the vacuum buffer tank, and the first metering cylinder is provided with the liquid level sensor;
the system controller is controlled by a control circuit and is respectively connected with the vacuum pump, the vacuum pressure sensor, the thermostat, the oil discharge valve, the emptying valve and the vacuum valve.
2. The device for measuring the foam generation tendency and the dissipation rate of transformer oil as claimed in claim 1, wherein a first plug is disposed at an inlet of the first metering cylinder, a second plug is disposed at an inlet of the second metering cylinder, an oil inlet line is disposed between the first metering cylinder and the second metering cylinder, one end of the oil inlet line penetrates through the first plug and enters the first metering cylinder, the other end of the oil inlet line penetrates through the second plug and enters the second metering cylinder, and an oil inlet valve is disposed on the oil inlet line.
3. The apparatus for measuring transformer oil foam generation tendency and dissipation rate of claim 2, wherein the oil feed valve is connected to the system controller through the control line.
4. The apparatus for measuring the development tendency and dissipation rate of transformer oil foam according to claim 1, wherein the vacuum line is provided with the vacuum pressure sensor and the vacuum valve.
5. The apparatus for measuring the foam generation tendency and the dissipation rate of transformer oil according to claim 2, wherein the oil discharge valve, the air release valve, the vacuum valve and the oil feed valve are of a solenoid valve structure.
6. A method for measuring the generation tendency and the dissipation rate of transformer oil foam under a vacuum state by using the measuring device as claimed in any one of claims 1 to 5, which comprises the following steps:
step S1, pouring untreated transformer oil into a first metering cylinder, connecting the first metering cylinder with a second metering cylinder through an oil inlet pipeline provided with an oil inlet valve, and connecting the second metering cylinder with a vacuum buffer tank through a vacuum pipeline, wherein the vacuum buffer tank is connected with a vacuum pump;
step S2, placing the first measuring cylinder and the second measuring cylinder in a thermostat;
step S3, setting the temperature of the thermostat, closing the oil inlet valve, opening the vacuum valve, and closing the emptying valve and the oil discharge valve;
step S4, starting a vacuum pump, and vacuumizing the vacuum buffer tank to a vacuum degree;
step S5, when the vacuum buffer tank reaches the vacuum degree, the vacuum buffer tank stops being vacuumized, the oil inlet valve is opened, the transformer oil in the first metering cylinder is injected into the second metering cylinder, and the volume V of the transformer oil injected into the second metering cylinder is recorded 0 ml；
Step S6, when the foam layer of the second metering cylinder is not raised any more, recording the sum V of the volume of the foam layer in the second metering cylinder and the volume of the transformer oil max ml；
Step S7, recording the time T min for the foam layer to dissipate completely; calculate the foam tendency and the foam layer dissipation rate, foam tendency ═ V max -V 0 )÷V 0 Foam layer dissipation rate ═ V max -V 0 )÷T。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110171327.5A CN114858649A (en) | 2021-02-03 | 2021-02-03 | Device and method for measuring generation tendency and dissipation rate of transformer oil foam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110171327.5A CN114858649A (en) | 2021-02-03 | 2021-02-03 | Device and method for measuring generation tendency and dissipation rate of transformer oil foam |
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| Publication Number | Publication Date |
|---|---|
| CN114858649A true CN114858649A (en) | 2022-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110171327.5A Pending CN114858649A (en) | 2021-02-03 | 2021-02-03 | Device and method for measuring generation tendency and dissipation rate of transformer oil foam |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4577491A (en) * | 1983-11-05 | 1986-03-25 | The British Petroleum Company, P.L.C. | Method for determining the stability of foam |
| CN104931384A (en) * | 2015-06-26 | 2015-09-23 | 四川省科源工程技术测试中心 | Vacuum metering device |
| CN206158722U (en) * | 2016-07-01 | 2017-05-10 | 中国地质大学（北京） | A device for counting metering rod separation of water system petroleum company of people's republic of china |
| CN109669027A (en) * | 2017-10-17 | 2019-04-23 | 中国石油天然气股份有限公司 | Detection device and detection method for vacuum anti-foaming performance of transformer oil |
| CN209043873U (en) * | 2018-10-23 | 2019-06-28 | 韩依飏 | The device of shield foaming agent half-life period is tested under a kind of high pressure |
| CN110542623A (en) * | 2019-09-24 | 2019-12-06 | 中国矿业大学 | Automatic measuring device and method for gas content of coal seam in coal mine |
| CN210269843U (en) * | 2019-07-15 | 2020-04-07 | 重庆市莱恩润滑油有限公司 | Lubricating oil foam characteristic tester |
-
2021
- 2021-02-03 CN CN202110171327.5A patent/CN114858649A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4577491A (en) * | 1983-11-05 | 1986-03-25 | The British Petroleum Company, P.L.C. | Method for determining the stability of foam |
| CN104931384A (en) * | 2015-06-26 | 2015-09-23 | 四川省科源工程技术测试中心 | Vacuum metering device |
| CN206158722U (en) * | 2016-07-01 | 2017-05-10 | 中国地质大学（北京） | A device for counting metering rod separation of water system petroleum company of people's republic of china |
| CN109669027A (en) * | 2017-10-17 | 2019-04-23 | 中国石油天然气股份有限公司 | Detection device and detection method for vacuum anti-foaming performance of transformer oil |
| CN209043873U (en) * | 2018-10-23 | 2019-06-28 | 韩依飏 | The device of shield foaming agent half-life period is tested under a kind of high pressure |
| CN210269843U (en) * | 2019-07-15 | 2020-04-07 | 重庆市莱恩润滑油有限公司 | Lubricating oil foam characteristic tester |
| CN110542623A (en) * | 2019-09-24 | 2019-12-06 | 中国矿业大学 | Automatic measuring device and method for gas content of coal seam in coal mine |
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