CN210953902U

CN210953902U - Device for detecting moisture in transformer oil

Info

Publication number: CN210953902U
Application number: CN201921870273.6U
Authority: CN
Inventors: 赵世钦; 周健; 姜海波; 龙玉华; 杨柳青; 李诗勇; 李慧; 马红怡; 陆承虎
Original assignee: Guizhou Power Grid Co Ltd
Current assignee: Guizhou Power Grid Co Ltd
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2020-07-07
Anticipated expiration: 2029-11-01

Abstract

The utility model discloses a moisture detection device in transformer oil, including detecting the pond, detect the pond lateral wall and install porous alumina humidity transducer and porous alumina humidity transducer probe and stretch into in the detection pond, detect pond top seal mounting have injection pipe and nitrogen gas pipe, and the injection pipe is connected to the syringe pump, and nitrogen gas union coupling is to the nitrogen gas bottle, installs solenoid valve one and solenoid valve two on injection pipe and the nitrogen gas pipe respectively, detects the pond top and still installs the blast pipe, and the oil extraction pipe is installed to the bottom, installs solenoid valve three and solenoid valve four on blast pipe and the oil extraction pipe. The utility model discloses realize sweeping of moisture in the detection pond before the detection for dry pond and humidity transducer probe are dry, can improve the moisture detection precision of the oil sample that awaits measuring greatly, can also realize detecting the clearance of sweeping in back detection pond, improve test operation personnel's security in the detection, adopt the oil extraction pipe to retrieve, avoid environmental pollution.

Description

Device for detecting moisture in transformer oil

Technical Field

The utility model belongs to the technical field of moisture test equipment in the transformer oil, a moisture detection device in transformer oil is related to.

Background

The moisture content in the insulating oil is an important index for evaluating the insulating property of electrical equipment, the micro-water content in the insulating oil needs to be tested once a year for an oil-immersed transformer according to the requirements of 'inspection test regulations of electrical equipment' of a power grid in the south, and the micro-water detection in the oil is also needed before the oil-immersed transformer and new equipment of the transformer are put into operation. The method for testing micro water in insulating oil widely used at present uses a coulometric method for measurement, namely iodine in electrolyte is reduced by sulfur dioxide when water exists in the oil, pyridine hydroiodic acid and pyridine methyl sulfate are generated under the condition that pyridine and methanol exist, meanwhile, iodine continuously generated by an anode reacts with moisture in the oil to generate hydroiodic acid in the electrolytic process until all moisture is completely consumed, and at the moment, the moisture content is measured and calculated through a Faraday's law of electrolysis. The traditional method is widely used for a long time due to the advantages of short measuring time, accurate measured value and the like, but the method needs to use electrolyte and has the following problems:

① the sulfur dioxide, pyridine and the like in the electrolyte belong to highly toxic substances, dangerous chemicals and have a large risk, and the use process, the storage and the like need to be carried out strictly according to requirements;

② tests must be carried out in a fume hood, but hidden dangers and influences are inevitably brought to the occupational health of workers in the process of long-term exposure to highly toxic substances, and the health of the testers can be harmed after long-term exposure;

③ the quality guarantee period of the electrolyte is generally one year, the electrolyte needs to be purchased periodically every year, the electrolyte of different manufacturers has the problem of the precision of the same equipment at present, and the electrolyte needs to be purchased by fixed-point manufacturers, which is troublesome;

④ the electrolyte belongs to dangerous chemicals, the waste liquid can not be discarded randomly after use, otherwise the pollution to the environment will be penalized, and the disposal of the electrolyte waste liquid every year becomes a big problem.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: the utility model provides a moisture detection device in transformer oil to solve the problem that exists among the prior art.

The utility model discloses the technical scheme who takes does: the utility model provides a moisture detection device in transformer oil, includes the detection pond, detect the pond lateral wall and install porous alumina humidity transducer and porous alumina humidity transducer probe and stretch into in the detection pond, detection pond top seal mounting has injection pipe and nitrogen gas pipe, the injection pipe is connected to the syringe pump, nitrogen gas union coupling is to the nitrogen cylinder, install solenoid valve one and solenoid valve two on injection pipe and the nitrogen gas pipe respectively, the blast pipe is still installed at the detection pond top, the oil extraction pipe is installed to the bottom, install solenoid valve three and solenoid valve four on blast pipe and the oil extraction pipe.

Preferably, above-mentioned nitrogen gas union coupling is to the intake pipe, and intake pipe upper end fixed seal connects in the detection pond upper end, and the lower extreme stretches into to be close to the detection pond bottom.

Preferably, the injection tube and the injection pump are connected by a quick-connection joint.

Preferably, the porous alumina humidity sensor is connected to a signal receiving end of a controller, and a control end of the controller is connected to the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve.

The utility model has the advantages that: compared with the prior art, the utility model discloses get into the detection pond through high-purity nitrogen before detecting, and go out from the blast pipe, realize sweeping of moisture in the detection pond, make dry pond and humidity transducer probe dry, can improve the moisture detection precision of the oil sample that awaits measuring greatly, can also realize detecting sweeping of back detection pond and clear up, through confined detection pond, adopt the syringe pump to inject the oil sample that awaits measuring, need not to use electrolyte, can avoid the safety risk that current detection mode leads to, improve test operation personnel's security, avoid bringing hidden danger and influence and long-time contact can harm experimenter's health for staff's occupational health, the detection process is simplified, and the cost is reduced, insulating oil can directly be retrieved to this device, the problem that current detection mode leads to retrieving the electrolyte difficulty has also been solved.

Drawings

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

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

Example 1: as shown in figure 1, a moisture detection device in transformer oil, including confined detection pond 1, detect 1 lateral wall in pond and install porous alumina humidity transducer 2 and porous alumina humidity transducer 2 probe and stretch into in detecting pond 1, detect 1 top seal installation in pond and have injection pipe 3 and nitrogen gas pipe 4, injection pipe 3 is connected to syringe pump 5, nitrogen gas pipe 4 is connected to nitrogen gas bottle 6, install solenoid valve 7 and solenoid valve two 8 on injection pipe 3 and the nitrogen gas pipe 4 respectively, detect 1 top in pond and still install blast pipe 9, the oil extraction pipe 10 is installed to the bottom, install solenoid valve three 11 and solenoid valve four 12 on blast pipe 9 and the oil extraction pipe 10.

Preferably, above-mentioned nitrogen gas pipe 4 is connected to intake pipe 13, and intake pipe 13 upper end fixed seal connects in detecting 1 upper end in pond, and the lower extreme stretches into and is close to detecting 1 bottom in pond, is convenient for carry out sweeping of whole detecting pond, sweeps more thoroughly.

Preferably, the injection pipe 3 and the injection pump 5 are connected by a quick joint, so that the assembly and disassembly are convenient.

Preferably, the porous alumina humidity sensor 2 is connected to a signal receiving end of a controller, and a control end of the controller is connected to the first solenoid valve 7, the second solenoid valve 8, the third solenoid valve 11 and the fourth solenoid valve 12.

Porous alumina humidity sensor: the alumina of the porous alumina humidity sensor is formed between two platinum sheets to form two electrodes, when the insulating oil passes through the sensor, trace moisture in the oil is absorbed by the alumina, the reactance value between the two electrodes changes, and the variable and the moisture in the oil have a certain relation (obtained by calibration), so that the trace moisture content in the oil is obtained.

The method comprises the steps of placing a porous alumina humidity sensor in a detection pool, purging water in the detection pool through high-purity nitrogen before measurement, enabling the porous alumina humidity sensor to be stable, injecting quantitative insulating oil into the detection pool through a syringe pump for verification, wherein a detection value displayed by equipment is a micro water content value, injecting oil products with different sample injection amounts into the oil products with known water content according to the test method, and obtaining different data through testing, wherein the sample injection amount of a result which is closest to the water content of the known oil products is the optimal sample injection amount.

Example 2: a detection method of a device for detecting moisture in transformer oil comprises the following steps: opening a second electromagnetic valve and a third electromagnetic valve, blowing high-purity nitrogen into a detection pool at a constant flow rate, blowing residual moisture in the detection pool, after the data of the porous alumina humidity sensor is stable, closing the second electromagnetic valve and the third electromagnetic valve, then pumping 2ml of test oil sample by using an injection pump, opening the first electromagnetic valve and the third electromagnetic valve to inject the oil sample into the detection pool, closing the first electromagnetic valve and the third electromagnetic valve, automatically detecting the device, determining the sensor data after the data is stable as the moisture content, after the test is finished, opening the second electromagnetic valve and the fourth electromagnetic valve to discharge the test oil in the detection pool by using the high-purity nitrogen, continuously blowing for 10 minutes, and ensuring the detection pool to be dry.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention, therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. The utility model provides a moisture detection device in transformer oil which characterized in that: including detecting pond (1), detect pond (1) lateral wall and install porous alumina humidity transducer (2) and porous alumina humidity transducer (2) probe and stretch into in detecting pond (1), detect pond (1) top seal installation have injection pipe (3) and nitrogen gas pipe (4), injection pipe (3) are connected to syringe pump (5), nitrogen gas pipe (4) are connected to nitrogen gas bottle (6), install solenoid valve (7) and solenoid valve two (8) on injection pipe (3) and nitrogen gas pipe (4) respectively, it still installs blast pipe (9) to detect pond (1) top, oil extraction pipe (10) are installed to the bottom, install three (11) of solenoid valve and four (12) of solenoid valve on blast pipe (9) and oil extraction pipe (10).

2. The device for detecting moisture in transformer oil according to claim 1, wherein: nitrogen pipe (4) are connected to intake pipe (13), and intake pipe (13) upper end fixed seal connects in detecting pond (1) upper end, and the lower extreme stretches into and is close to detecting pond (1) bottom.

3. The device for detecting moisture in transformer oil according to claim 1, wherein: the injection tube (3) is connected with the injection pump (5) by a quick joint.

4. The device for detecting moisture in transformer oil according to claim 1, wherein: the porous alumina humidity sensor (2) is connected to a signal receiving end of the controller, and a control end of the controller is connected to the first electromagnetic valve (7), the second electromagnetic valve (8), the third electromagnetic valve (11) and the fourth electromagnetic valve (12).