CN103323287B - Automatic sampling device for sampling furfural in transformer oil and sampling method - Google Patents

Abstract

The invention discloses a transformer oil furfural automatic sampling device, which comprises a sampling container, an extractant container, a sample container to be tested, and a control device. The oil delivery port of the sampling container is connected to the transformer oil intake port through a valve 1, and the sampling container is provided with Filter layer, the oil outlet of the sampling container is connected to the oil delivery port of the transformer oil container through the valve 2 and the cumulative flowmeter; the liquid outlet of the extractant container is connected to the liquid variable pump through the valve 6, and the liquid variable pump is connected to the input of the sampling container port; the sample to be detected is connected to the liquid variable pump through the valve 7, and the liquid inlet of the waste liquid container is connected to the liquid variable pump through the valve 8. The furfural sample with higher concentration can be obtained by controlling the corresponding process through the control device, which enables the operator to use a simple measurement method to complete the efficient and rapid measurement of the furfural concentration in the laboratory.

Description

A kind of automatic sampling device and sampling method of furfural in transformer oil

technical field

The invention relates to the field of transformer oil sampling, in particular to a transformer oil furfural automatic sampling device and a sampling method.

Background technique

At present, the transformer is an important equipment in the power system. Once an accident occurs, it may cause a large-scale blackout, long maintenance period, high maintenance cost and wide impact. According to statistics, accidents caused by various types of insulation faults accounted for more than 85% of all transformer accidents. In the past 10 years, insulation aging ranked second among the causes of power system faults.

The currently used monitoring technology of furfural concentration in transformer oil is considered to be a relatively effective non-destructive aging diagnosis technology for transformer solid insulation. In 1993, the International Electrotechnical Commission included the test method of furfural in mineral oil in the IEC standard. Due to the low concentration of furfural in transformer oil (mg/l level), HPLC (High Performance Liquid Chromatography) is used. This technology has high detection accuracy and is a general chemical detection technology, but this technology requires pre-extraction of samples The processing and operation require a high level of technology, special personnel are needed, and the equipment is expensive, so it is not suitable for popularization and use.

Contents of the invention

The purpose of the present invention is to provide a kind of transformer oil furfural automatic sampling device and sampling method, can adopt simple measuring method to finish the efficient and rapid measurement of furfural concentration.

The present invention adopts the following technical scheme: a transformer oil furfural automatic sampling device, comprising a sampling container, an extractant container, a sample container to be detected, and a control device, the oil delivery port of the sampling container is connected to the oil inlet of the transformer through a valve 1, and the sampling container A filter layer is arranged inside, and the oil outlet of the sampling container is connected to the oil delivery port of the transformer oil container through the valve 2 and the cumulative flow meter; the liquid outlet of the extraction agent container is connected to the liquid variable pump through the valve 6, and the liquid variable pump is connected to the sampling The input port of the container; the sample to be detected is connected to the liquid variable pump through the valve 7, and the liquid inlet of the waste liquid container is connected to the liquid variable pump through the valve 8; the control end of each of the valves is connected to the control device The control output terminal is connected, and the signal output terminal of the cumulative flowmeter is connected with the signal input terminal of the control device.

The oil delivery port of the sampling container is also connected to the air intake device through the valve 5, and the oil outlet of the sampling container is also connected to the vacuum pump through the valve 3, the output end of the vacuum pump is the gas outlet, and the control end of the valve 5 and the valve 3 Connect to the control output of the control device.

The oil outlet of the sampling container is also connected to the air pump through the valve 4, the other end of the air pump is an air inlet, and the control end of the valve 4 is connected to the control output end of the control device.

The oil outlet of the sampling container is connected to the liquid inlet of the waste liquid container through a valve 9, and the control end of the valve 9 is connected to the control output end of the control device.

The oil outlet of the transformer oil container is connected with a valve 10, and the control end of the valve 10 is connected with the control output end of the control device.

The filter layer adopts three layers of transformer oil filter paper.

The automatic sampling method realized according to the automatic sampling device for transformer oil furfural includes the following steps: (1), start the control device, and the control device closes all valves, cumulative flow meters and pumps; set parameters; (2), turn the transformer The oil inlet is connected to the oil outlet of the transformer with a hose; (3), the control device automatically opens valve 1, valve 2 and valve 3, starts the vacuum pump, and extracts oil samples; the extracted oil samples enter the transformer oil container through the cumulative flowmeter , the accumulative flow meter stores the measured accumulative flow in the control device, and the control device closes valve 1, valve 2, valve 3 and the vacuum pump after completion. During the sampling process, the oil sample passes through the filter layer, and furfural is filtered in the filter layer; (4 ), the control device automatically opens valve 6, starts the liquid variable pump, extracts the extractant from the extractant container and enters the sampling container; after completion, automatically closes the liquid variable pump and valve 6; (5), the control device automatically opens valve 4, the valve 5. Start the blower pump, and then close valve 4, valve 5 and blower pump; (6), the control device automatically opens valve 7, starts the liquid variable pump in reverse, and draws 5-20ml of the extractant in the sampling container into the sample container to be tested , automatically close the valve 7 and the liquid variable pump; (7), the control device automatically opens the valve 8 and the valve 9, reversely starts the liquid variable pump, puts the remaining extractant in the sampling container into the waste liquid container, and automatically closes the valve 8 , valve 9 and liquid variable pump.

After the step (7) is completed, it also includes a step (8): the control device automatically opens the valve 6, starts the liquid variable pump, and draws 100-300ml of the extractant from the extractant container into the sampling container; after completion, close the liquid variable Pump and valve 6; then automatically open valve 8 and valve 9, reverse start the liquid variable pump, put the remaining extractant in the sampling container into the waste liquid container; automatically close valve 8, valve 9 and liquid variable pump; then repeat In this step, the cleaning process of the sampling container is completed.

In the step (4), the ratio of the extraction dose of the extraction agent drawn from the extractant container to the oil sample is: 1:10.

The time to start the blower pump in step (5) is 10 minutes; after the step (5) is completed, let stand for 5 minutes and then enter step (6).

The present invention proposes a high-efficiency transformer oil furfural automatic sampling device integrating concentrated sampling and automatic oil sample pretreatment. After using the device for sampling, a high-concentration furfural sample can be obtained, allowing the operator to use it in the laboratory. The simple measurement method completes the efficient and rapid measurement of furfural concentration.

Description of drawings

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

Detailed ways

As shown in Figure 1, a kind of transformer oil furfural automatic sampling device of the present invention comprises sampling container 14, extractant container 17, sample container 18 to be detected, control device 20, and the oil delivery port of sampling container 14 passes through valve 1 connected to the transformer oil inlet 25, the sampling container 14 is provided with a filter layer 15, the oil outlet of the sampling container 14 is connected to the oil delivery port of the transformer oil container 21 through a pipeline, and a valve 2 and a cumulative flow meter are arranged on the pipeline 16; the oil delivery port of the sampling container 14 is also connected to the air intake device 26 through the valve 5, and the oil outlet of the sampling container 14 is also connected to the vacuum pump 12 through the valve 3, and the output end of the vacuum pump 12 is an air outlet 23; The oil outlet of described sampling container 14 is also connected air pump 11 by valve 4, and the other end of air pump 11 is air inlet 24; The oil outlet of described sampling container 14 is connected waste liquid container 19 by valve 9 Liquid inlet; the liquid outlet of the extractant container 17 is connected to the liquid variable pump 13 through the valve 6, and the liquid variable pump 13 is connected to the input port of the sampling container 14; the described sample to be detected is connected to the liquid variable pump 13 through the valve 7 , the liquid inlet of the waste liquid container 19 is connected to the liquid variable pump 13 through the valve 8; the oil outlet of the transformer oil container 21 is connected to the oil discharge port 22 through the valve 10. The control end of each valve is connected with the control output end of the control device 20, and the signal output end of the integrated flow meter 16 is connected with the signal input end of the control device; the liquid variable pump 13, air pump 11, vacuum pump The control ends of 12 are all connected to the signal input ends of the control device 20 . Wherein the filter layer 15 adopts three layers of transformer oil filter paper.

Utilize the automatic sampling method that above-mentioned transformer oil furfural automatic sampling device realizes, comprise the following steps: (1), start control device 20, control device 20 closes all valves and accumulative flow meter 16, pump; According to sampling requirement, set accumulative flow or Control the amount and time of oil sampling by setting the working time of the oil well pump;

(2) Connect the transformer oil inlet 25 to the transformer oil outlet with a hose;

(3), the control device 20 automatically opens valve 1, valve 2 and valve 3, starts the vacuum pump 12, and takes oil samples; the oil samples taken pass through the cumulative flow meter 16 and enter the transformer oil container 21, and the cumulative flow meter 16 will measure the accumulated The flow rate is stored in the control device 20. After the completion, the control device 20 automatically closes the valve 1, valve 2, valve 3 and vacuum pump 12. During the sampling process, the oil sample passes through the filter layer 15, and the furfural is filtered in the filter layer;

(4), the control device 20 automatically opens the valve 6, starts the liquid variable pump 13, extracts the extractant from the extractant container 17 and enters the sampling container 14, wherein the ratio of the extraction dose to the oil sample is: 1:10; after completion, The control device 20 automatically closes the liquid variable pump 13 and the valve 6;

(5), the control device 20 automatically opens the valve 4, the valve 5, starts the air pump 11, and after 10 minutes, the control device 20 automatically closes the valve 4, the valve 5 and the air pump 11;

(6) After standing still for 5 minutes, the control device 20 will automatically open the valve 7, reversely start the liquid variable pump 13, and extract 5-20ml of the extractant in the sampling container 15 (determined according to the size of the sample container to be tested) into the waiting room. Detect the sample container 18, and the control device 20 automatically closes the valve 7 and the liquid variable pump 13;

(7), the control device 20 automatically opens the valve 8 and the valve 9, reversely starts the liquid variable pump 13, puts the remaining extraction agent in the sampling container into the waste liquid container 19, and then automatically closes the valve 8, the valve 9 and the liquid variable pump 13;

(8), the control device automatically opens the valve 6, starts the liquid variable pump 13, and extracts 100-300ml of the extractant from the extractant container 17 (the specific extraction amount is determined according to the actual transformer oil sample requirements) into the sampling container; , automatically close the liquid variable pump and valve 6; then automatically open the valve 8 and valve 9, start the liquid variable pump 13 in reverse, put the remaining extractant in the sampling container into the waste liquid container 19; the control device 20 automatically closes the valve 8. Valve 9 and liquid variable pump 13; then repeat this step to complete the cleaning process of the sampling container.

Claims (10)

1. a transformer oil furfural automatic sampling device, it is characterized in that: comprise sampling container, extractant container, sample receiver to be detected, control device, the oil transportation mouth of sampling container gets hydraulic fluid port by valve one (1) connection transformer, be provided with filtering layer in sampling container, the oil-out of sampling container passes through the oil transportation mouth of valve two (2) and flow totalizer connection transformer oil vessel; The liquid outlet of described extractant container connects liquid variable output pump by valve six (6), and variable displacement fluid pump connects the input port of sampling container; Described sample to be detected connects liquid variable output pump by valve seven (7), and the inlet of waste fluid container connects liquid variable output pump by valve eight (8); The control end of each described valve is connected with the control output end of control device, the signal input part of the signal output part connection control device of described flow quantity recorder.

2. transformer oil furfural automatic sampling device according to claim 1, it is characterized in that: the oil transportation mouth of described sampling container also connects admission gear by valve five (5), the oil-out of described sampling container also connects vacuum pump by valve three (3), vacuum delivery side of pump is gas outlet, and valve five (5) is connected with the control output end of control device with the control end of valve three (3).

3. transformer oil furfural automatic sampling device according to claim 2, it is characterized in that: the oil-out of described sampling container also connects air-blowing pump by valve four (4), the other end of air-blowing pump is air intake opening, and the control end of valve four (4) is connected with the control output end of control device.

4. transformer oil furfural automatic sampling device according to claim 3, it is characterized in that: the oil-out of described sampling container connects the inlet of waste fluid container by valve nine (9), the control end of valve nine (9) is connected with the control output end of control device.

5. transformer oil furfural automatic sampling device according to claim 4, is characterized in that: the oil-out of described transformer oil container is connected with valve ten (10), and the control end of valve ten (10) is connected with the control output end of control device.

6. transformer oil furfural automatic sampling device according to claim 5, is characterized in that: described filtering layer adopts transformer oil filter paper three layers.

7. the automatic sampling method of transformer oil furfural automatic sampling device realization according to claim 6, is characterized in that: comprise the following steps: (one), startup control device, and control device cuts out all valves and flow quantity recorder, pump; Setup parameter; (2), transformer is got hydraulic fluid port flexible pipe and receive transformer fuel outlet; (3), control device opens valve one (1), valve two (2) and valve three (3), startup vacuum pump, extraction oil sample automatically; The oil sample extracted enters in transformer oil container through flow totalizer, flow totalizer by measure integrated flux stored in control device, control device valve-off one (1), valve two (2), valve three (3) and vacuum pump after completing, in sampling process, oil sample is through filtering layer, and furfural is filtered at filtering layer; (4), control device opens valve six (6), start liquid variable output pump automatically, extracts extractant and enter sampling container from extractant container; After completing, automatic closing liquid variable output pump and valve six (6); (5), control device opens valve four (4), valve five (5), startup air-blowing pump, then valve-off four (4), valve five (5) and air-blowing pump automatically; (6), control device opens valve seven (7), reverse starting variable displacement fluid pump automatically, extracts extractant 5-20ml in sampling container and enters sample receiver to be detected, automatic-closing valve seven (7) and variable displacement fluid pump; (7), control device opens valve eight (8) and valve nine (9) automatically, and reverse starting variable displacement fluid pump, remains extractant by sampling container, put into waste fluid container, automatic-closing valve eight (8), valve nine (9) and variable displacement fluid pump.

8. automatic sampling method according to claim 7, it is characterized in that: also include step (eight) after described step (seven) completes: valve six (6) opened automatically by control device, start liquid variable output pump, extracts 100-300ml extractant and enters sampling container from extractant container; After completing, closing liquid variable output pump and valve six (6); Then automatically open valve eight (8) and valve nine (9), reverse starting variable displacement fluid pump, remains extractant by sampling container, puts into waste fluid container; Automatic-closing valve eight (8), valve nine (9) and variable displacement fluid pump; Then repeat this step, complete the cleaning process of sampling container.

9. automatic sampling method according to claim 7, is characterized in that: the extraction dosage extracting extractant in described step (four) from extractant container with the ratio extracting oil sample is: 1:10.

10. automatic sampling method according to claim 7, is characterized in that: the time starting air-blowing pump in step (five) is 10 minutes; Leave standstill after described step (five) completes and enter step (6) after 5 minutes.