CN107063920B - A kind of measuring device and method of gas content in insulating oil - Google Patents

Abstract

The invention discloses a measuring device for gas content in insulating oil, which comprises an oil quantitative container, a vacuum degree measuring device and an oil pumping device; the bottom of the oil quantitative container is provided with an oil inlet, and the top of the oil quantitative container is provided with an oil outlet The vacuum degree measuring device is connected with the oil quantitative container, and valves are set between the oil inlet, the oil outlet and the vacuum degree measuring device and the oil quantitative container; the oil pumping device includes the oil pumping container and the piston set in the oil pumping container , one end of the oil pumping container is provided with an oil discharge port, and this end is connected with the oil quantitative container, the other end of the oil pumping container is provided with an opening communicating with the atmosphere, and both the oil discharge port and the oil quantitative container are provided with the oil pumping container The valve and the side wall of the oil pumping container are provided with several volume signs. The measuring method of the device is also disclosed at the same time. The invention realizes the absolute vacuum in the initial state through the movement of the piston, realizes the measurement of the gas content in the insulating oil without pre-vacuumizing, simplifies the test process, and shortens the test time.

Description

Device and method for measuring gas content in insulating oil

technical field

The invention relates to a measuring device and method for gas content in insulating oil, in particular to a vacuum differential pressure measuring device and method for measuring gas content in insulating oil without pre-vacuumizing, and belongs to the technical field of power system detection.

Background technique

Insulating oil has excellent insulation, heat dissipation and cooling, and arc extinguishing functions, and is widely used in electrical equipment such as transformers, reactors, and transformers. The gas dissolved in the insulating oil will be ionized under the action of high field strength. When the temperature and pressure drop suddenly, bubbles will be formed and the bubbles will be pulled into a long body. It is very easy for the gas to collide and dissociate, causing breakdown and endangering the safe operation of the equipment. , so the gas content in the insulating oil of oil-filled electrical equipment must be strictly controlled. During the detection process of the gas content in the insulating oil, any steps that may come into contact with the air will cause errors. In the past, the insulating oil had to be taken back from the substation site to the laboratory, and then chromatographic or pre-vacuumized vacuum differential pressure method During the detection, sample collection and transportation, the air is easy to exchange with the gas in the insulating oil, which affects the accuracy of the test, and it cannot be directly measured at the substation site. The detection process is complicated, and it takes a lot of time to transport the oil sample.

Contents of the invention

In order to solve the above technical problems, the present invention provides a device and method for measuring gas content in insulating oil.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A measuring device for gas content in insulating oil, comprising an oil quantitative container, a vacuum degree measuring device, and an oil pumping device; the bottom of the oil quantitative container is provided with an oil inlet, and the top of the oil quantitative container is provided with an oil outlet port, the vacuum degree measuring device is connected with the oil quantitative container, and valves are arranged between the oil inlet, the oil outlet and the vacuum degree measuring device and the oil quantitative container; the oil pumping device includes an oil pumping container and a set Piston in the oil pumping container, one end of the oil pumping container is provided with an oil discharge port, and this end is connected with the oil quantitative container, the other end of the oil pumping container is provided with an opening communicating with the atmosphere, the oil discharge port and A valve is arranged between the oil quantitative container and the oil pumping container, and a number of volume marks are arranged on the side wall of the oil pumping container.

A filter element is arranged in the opening communicating with the atmosphere.

The piston is connected with a piston rod extending out of the oil pumping container.

The inner cavity volume between the Nth volume mark and the end connected with the oil quantitative container is N times the volume of the oil quantitative container.

N is a positive integer.

A measuring method of a measuring device for gas content in insulating oil, comprising the following steps,

Oil sample collection preparation: push the piston to the end connected to the oil quantitative container, close all valves, and connect the oil inlet to the oil taking valve of the equipment;

Collect oil samples: open the valve between the oil outlet and the oil quantitative container, open the valve between the oil inlet and the oil quantitative container, open the oil valve of the equipment, the insulating oil enters the oil quantitative container, and the insulating oil fills the oil quantitative container After that, continue to enter the oil, and after a certain amount of oil is discharged from the oil outlet, close the valve between the oil outlet and the oil quantitative container, close the valve between the oil inlet and the oil quantitative container, and close the oil taking valve of the equipment;

Detection of gas content in insulating oil: Open the valve between the oil quantitative container and the oil pumping container, move the piston to the other end to completely transfer the insulating oil in the oil quantitative container to the oil pumping container, and continue to move the piston to make it equal to a certain volume Align the marks, open the valve between the vacuum degree measuring device and the oil quantitative container, read the vacuum degree, and calculate the gas content value in the insulating oil according to the vacuum degree and gas volume; the gas volume is the volume mark aligned with the piston to the oil quantitative the volume of the lumen between the connected ends of the vessel;

Close the valve between the oil quantitative container and the oil pumping container, open the valve between the oil discharge port and the oil pumping container, push the piston to the end connected with the oil quantitative container, the insulating oil is discharged from the oil discharge port, and the detection is completed.

When collecting oil samples, the amount of oil discharged from the oil outlet is twice the volume of the oil quantitative container.

The beneficial effects achieved by the present invention: 1. The present invention can detect the absolute vacuum in the initial state by moving the piston, and can measure the gas content in the insulating oil by detecting pressure changes without pre-vacuumizing, which greatly simplifies the test process 1. Shorten the test time; 2. After the invention realizes the initial vacuum, further moving the piston provides a space for the precipitation of dissolved gas in the insulating oil very conveniently, reducing the influence of "residual pressure" on subsequent gas precipitation; 3. The integrated development of sample collection and detection in the present invention realizes the on-site detection of the gas content of the insulating oil in the substation for the first time, avoids the error caused by the sample being in contact with the air and dissolves into the insulating oil during the collection and transportation process, and improves the accuracy of the test. Accuracy and reliability, and the sample does not need to be shipped, reducing transportation costs and test time.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

As shown in Figure 1, a device for measuring the gas content in insulating oil includes an oil quantitative container 1, a vacuum degree measuring device 3 and an oil pumping device.

The bottom of the oil quantitative container 1 is provided with an oil inlet 5, and the top of the oil quantitative container 1 is provided with an oil outlet 6. The vacuum degree measuring device 3 (usually a vacuum gauge) is connected with the oil quantitative container 1. The oil inlet 5, A valve 9 is arranged between the oil outlet 6 and the vacuum measuring device 3 and the oil quantitative container 1 .

The oil pumping device includes an oil pumping container 2 and a piston 4 arranged in the oil pumping container 2, the piston 4 is matched with the oil pumping container 2, impermeable to oil and air leakage, the piston 4 is connected with the piston rod protruding from the oil pumping container 2, and the pumping One end of the oil container 2 is provided with an oil discharge port 7, and this end is connected with the oil quantitative container 1, and the other end of the oil pumping container 2 is provided with an opening communicating with the atmosphere, and a filter element 8 is arranged in the opening communicating with the atmosphere, and the filter element 8 Particles in the atmosphere can be intercepted, and a valve 9 is arranged between the oil discharge port 7 and the oil quantitative container 1 and the oil pumping container 2, and a number of volume signs are arranged on the side wall of the oil pumping container 2, and the Nth volume mark is connected with the oil pumping container 2. The volume of the inner cavity between the connected ends of the oil quantitative container 1 is N times the volume of the oil quantitative container 1, where N is a positive integer.

Preferably, in order to facilitate the flow of the insulating oil and reduce the moving output of the piston 4, the oil pumping device is arranged below the oil quantitative container 1, that is, the top of the oil pumping container 2 is connected to the bottom end of the oil quantitative container 1 through a valve 9, and the oil is discharged The port 7 is also arranged on the top of the oil pumping container 2, and the opening communicating with the atmosphere is arranged on the bottom of the oil pumping container 2.

Preferably, there are two volume signs, volume sign A and volume sign B, defining the end connected to the oil quantitative container 1 as the start sign O, and the volume of the cavity between the volume sign A and the start sign O is equal to the oil The volume of the quantitative container 1, the volume of the cavity between the volume mark B and the initial mark O is twice the volume of the oil quantitative container 1.

The measurement method of above-mentioned device, comprises the following steps:

Step 1, oil sample collection preparation: push the piston 4 to the end connected to the oil quantitative container 1, close all valves 9, and connect the oil inlet 5 to the oil extraction valve of the equipment.

Step 2, collecting oil samples: open the valve 9 between the oil outlet 6 and the oil quantitative container 1, open the valve 9 between the oil inlet 5 and the oil quantitative container 1, open the oil valve of the equipment, and the insulating oil enters the oil Quantitative container 1, after the insulating oil is filled with oil quantitative container 1, continue to enter the oil until the oil volume discharged from oil outlet 6 is twice the volume of oil quantitative container 1, which not only discharges the initial dead oil of the equipment, but also cleans the oil quantitative container 1. Close the valve 9 between the oil outlet 6 and the oil quantitative container 1, close the valve 9 between the oil inlet 5 and the oil quantitative container 1, and close the oil valve of the equipment.

Step 3, gas content detection in the insulating oil: open the valve 9 between the oil quantitative container 1 and the oil pumping container 2, move the piston 4 to the other end to completely transfer the insulating oil in the oil quantitative container 1 to the oil pumping container 2, Continue to move the piston 4 to align with a certain volume mark, open the valve 9 between the vacuum degree measuring device 3 and the oil quantitative container 1, read the vacuum degree, and calculate the gas content value in the insulating oil according to the vacuum degree and the gas volume; Wherein the gas volume is the volume of the inner cavity between the volume mark aligned with the piston and the end connected with the oil quantitative container.

Take the volume mark A and volume mark B as an example: when the piston 4 moves to the volume mark A, the insulating oil filled in the oil quantitative container 1 can be completely transferred to the oil pumping container 2. If the insulating oil does not contain gas, the oil Quantitative container 1 should be in absolute vacuum, because the insulating oil actually contains gas, the gas precipitation will produce "residual pressure", "residual pressure" will affect the subsequent gas precipitation in the insulating oil, move the piston 4 to the volume mark B , increasing the volume can reduce the influence of "residual pressure" and promote the subsequent gas precipitation in insulating oil.

Step 4, close the valve 9 between the oil quantitative container 1 and the oil pumping container 2, open the valve 9 between the oil discharge port 7 and the oil pumping container 2, push the piston 4 to the end connected with the oil quantitative container 1, The insulating oil is discharged from the oil discharge port 7, and the detection is completed.

The invention can detect the absolute vacuum of the initial state through the movement of the piston 4, and can realize the measurement of the gas content in the insulating oil by detecting the pressure change without pre-vacuumizing, which greatly simplifies the test process, shortens the test time, and realizes the sample The integrated development of collection and testing, the gas content of insulating oil is tested on-site at the substation, which avoids the error caused by the sample being in contact with the air and dissolving into the insulating oil during the collection and transportation process, and improves the accuracy and reliability of the test. And the sample does not need to be transported, which reduces the transport cost and test time.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and modifications can also be made. It should also be regarded as the protection scope of the present invention.

Claims (7)

1. a kind of measuring device of gas content in insulating oil, it is characterised in that: including oily dosing container, vacuum degree measuring equipment and Oil rig；The bottom end of the oil dosing container is provided with oil inlet, and the top of the oil dosing container is provided with oil outlet, institute It states vacuum degree measuring equipment to connect with oily dosing container, the oil inlet, oil outlet and vacuum degree measuring equipment are quantitative with oil Valve is provided between container；The oil rig includes oil pumping container and setting in oil pumping container inner piston, the oil pumping One end of container is provided with oil discharge outlet, and the end is connect with oily dosing container, and the other end of the oil pumping container is provided with company Open to atmosphere opening, the oil discharge outlet and oily dosing container are provided with valve between oil pumping container, the oil pumping container Several volume indicators are provided on side wall.

2. a kind of measuring device of gas content in insulating oil according to claim 1, it is characterised in that: be communicated with the atmosphere Filter core is provided in opening.

3. a kind of measuring device of gas content in insulating oil according to claim 1, it is characterised in that: the piston with stretch The piston rod connection of oil pumping container out.

4. a kind of measuring device of gas content in insulating oil according to claim 1, it is characterised in that: the N articles volume mark Will is to N times that the cavity volume between the end connecting with oily dosing container is oily dosing container volume.

5. a kind of measuring device of gas content in insulating oil according to claim 4, it is characterised in that: N is positive integer.

6. based on a kind of measurement method of the measuring device of gas content in insulating oil described in claim 1, it is characterised in that: packet Include following steps,

Acquisition oil sample prepares: piston being pushed into the end connecting with oily dosing container, all valves are closed, by oil inlet and equipment Take oil valve to connect；

It acquires oil sample: opening the valve between oil outlet and oily dosing container, open the valve between oil inlet and oily dosing container Door opens the oil valve that takes of equipment, and insulating oil enters oily dosing container and continues oil inlet after insulating oil is full of oily dosing container, wait go out After certain oil mass is discharged in hydraulic fluid port, close the valve between oil outlet and oily dosing container, close oil inlet and oily dosing container it Between valve, pass hull closure takes oil valve；

Gas content in insulating oil detection: opening the valve between oily dosing container and oil pumping container, will to the mobile piston of the other end Insulating oil in oily dosing container is completely transferred in oil pumping container, and continuing to move to piston is aligned it with some volume indicator, The valve between vacuum degree measuring equipment and oily dosing container is opened, vacuum degree is read, is calculated according to vacuum degree and gas volume Gassiness magnitude in insulating oil；Wherein gas volume be piston alignment volume indicator to the end being connect with oily dosing container it Between cavity volume；

The valve between oily dosing container and oil pumping container is closed, the valve for opening oil discharge outlet between container of pumping, by piston It is pushed into the end connecting with oily dosing container, insulating oil is discharged from oil discharge outlet, completes detection.

7. a kind of measurement method of the measuring device of gas content in insulating oil according to claim 6, it is characterised in that: In When acquiring oil sample, the oil mass of oil outlet discharge is twice of oily dosing container volume.