CN203241113U - Transformer respirator online monitoring instrument - Google Patents

Abstract

The utility model discloses a transformer respirator online monitoring instrument which comprises a photoelectrical speed sensor, a single chip microcomputer collection system, a data storage system, a data transmission system and a PC, wherein the photoelectrical speed sensor, the single chip microcomputer collection system, the data storage system, the data transmission system and the PC are sequentially connected. A data display system is further in series connection between the data storage system and the PC. The modules are powered by a power source management module. The photoelectrical speed sensor is installed inside a pipeline between a respirator and an explosion-proof pipe. The explosion-proof pipe is connected with an oil level indicator. The oil level indicator is connected with a gas relay. The gas relay is connected with an on-load voltage regulation body. The transformer respirator online monitoring instrument has the advantages of reflecting the amount of the air mass flow in the respirator and the corresponding floating numerical relationship of the oil level indicator in a real-time mode, being capable of judging the problem of a fake oil level, and relieving the difficulty of daily maintenance work.

Description

Transformer breather on-line monitoring instrument

Technical field

The utility model relates to a kind of transformer breather on-line monitoring instrument.

Background technology

At present, a lot of about the research work of carrying out transformer online monitoring both at home and abroad, breathe condition monitoring for respirator and belong to blank, entirely observe to judge respirator breathing situation by personnel.In the usual little situation of temperature variation, it is very faint that respirator is breathed situation, pure words of observing by personnel, be difficult to judge the breathing situation, if at this moment capsule-type or metal expander clamping stagnation situation appear in installation for transformer, cause false oil level in the conservator, and can not judge the respirator no breathing, probably cause and to judge the transformer normal operation, thereby can not in time find the transformer defective.This has also increased respirator daily servicing difficulty.

In the prior art, the defective that the transformer breather autoalarm exists is, the first, and cost is higher, and the program comparision of realizing is complicated; The second, chimes of doom easily interferes with other backstage chimes of doom, causes operations staff's energy not concentrate; The 3rd, can not judge the problem of false oil level.

The utility model content

The purpose of this utility model is exactly to provide a kind of transformer breather on-line monitoring instrument in order to address the above problem, and it has advantages of the problem that can solution must not in time find to add oil level.

To achieve these goals, the utility model adopts following technical scheme:

A kind of transformer breather on-line monitoring instrument, comprise acquisition system, described acquisition system gathers respectively the data of oil level indicator and gasmetry element, and data are stored in the data-storage system, data in the data-storage system can be uploaded to PC by data transmission system, can also show by data presentation system, described gasmetry element is installed in the pipe interior between respirator and the explosion stack, described explosion stack is connected with oil level indicator, described oil level indicator is connected with Buchholz relay, and described Buchholz relay is connected with the on-load voltage regulation body.

Described gas flow measuring sensor is light electricity velocity sensor.

Described acquisition system is main MCU chip, adopts the AT89S51 single-chip microcomputer.

Described data presentation system is LCDs.

Described data-storage system is NAND FLASH chip.

Described power management module is the DC-DC control chip.

Described data transmission system is USB communication core.

The method of work of described on-line monitoring instrument mainly is divided into following steps:

Step (1): beginning;

Step (2): set the sampling period;

Step (3): step-by-step counting, light electricity velocity sensor gathers the data of air mass flow;

Step (4): the data of air mass flow are inputted acquisition system behind data transformation, calculate air mass flow speed, and utilize air mass flow speed v, the long-pending S of respirator pipeline section and air effect in the time of light electricity velocity sensor t, calculate the gas flow V of the respirator of flowing through ₁V is air mass flow speed, and unit is m/s; S is that the respirator pipeline section is long-pending, cm ², be known quantity, can draw by actual measurement; V ₁Refer to the to flow through gas flow of respirator, unit is ml, milliliter;

Step (5): data shift and the data storage;

Step (6): judge whether transformer false oil level occurs, if so, enter simultaneously three parallel branches of step (7-1), step (7-2), step (7-3), just finish if not;

Step (7-1): judge whether real-time demonstration, if just show in real time, just enter if not step (7-2);

Step (7-2): judge whether communication port is connected to computing machine, if with regard to data transmission, just enter if not step (7-3);

Step (7-3): judge whether it is low-voltage, if prompting is reported to the police with regard to low-voltage, just finish if not.

The specific formula for calculation of described step (4) is:

V ₁=v*S*t

Wherein, v represents that air mass flow speed, S represent that the respirator pipeline section amasss and t represents that air effect is in the time of light electricity velocity sensor, V ₁The flow through gas flow of respirator of expression.

The computing method of the false oil level of the judgement of described step (6) are:

If r is conservator lateral cross-section radius of a circle, L is the length of fuel tank; H ₁For pasta changes front height, height value before namely oil level indicator changes; H ₂Be the height after the pasta variation, height value after namely oil level indicator changes; H is oil level change in elevation calculated value; θ ₁, θ ₂Be respectively pasta and change fan-shaped angle front, that pasta changes rear correspondence;

Its concrete computation process is as follows:

(1) as r 〉=H ₂The time, the volume after namely oil level changes does not surpass half of conservator.Can be obtained by trigonometric function:

${\mathrm{\θ}}_1=2\arccos \left(\frac{r-H_1}{r}\right);$ ${\mathrm{\θ}}_2=2\arccos \left(\frac{r-H_2}{r}\right)$

Wherein, H ₁, H ₂Be the numerical value that reads from oil level indicator;

H ₁The sectional area of corresponding circle $S_{}$ ${}_1=\frac{{\mathrm{\θ}}_1}{360}\mathrm{\π}{r}^2-\frac{1}{2}*2\sqrt{r^2-{(r-H_1)}^2}*(r-H_1)$

$=\frac{{\mathrm{\θ}}_1}{360}\mathrm{\π}{r}^2-\sqrt{2r{H}_1-H_1^2}*(r-H_1)$

In like manner can get H ₂The sectional area of corresponding circle $S_{}$ ${}_2=\frac{{\mathrm{\&theta;}}_1}{360}\mathrm{\&pi;}{r}^2-\sqrt{2r{H}_2-{\mathrm{<figure-callout\; id="2"\; label="H"\; filenames="HDA00003062656500031.png,HDA00003062656500032.png"\; state="\{\{state\}\}">H</figure-callout>}}_2^2}*(r-H_2)$

The volume V that oil changes in the conservator ₂=| S ₂-S ₁| * L

The gas flow V of the respirator of flowing through that light electricity velocity sensor is measured ₁

Judge V ₁, V ₂Difference whether surpass the threshold value of setting, be exactly false oil level to occur if surpass, false oil level just do not occur if surpass, thereby realize judging whether to occur false oil level situation;

(2) as r＜H ₂The time, the volume after namely oil level changes surpasses half of conservator,

Can be obtained by trigonometric function:

${\mathrm{\&theta;}}_1=2\arccos \left(\frac{r-H_1}{r}\right)$ ${\mathrm{\&theta;}}_2=2\arccos \left(\frac{H_2-r}{r}\right)$

H ₁The sectional area of corresponding circle $S_{}$ ${}_1=\frac{{\mathrm{\&theta;}}_1}{360}\mathrm{\&pi;}{r}^2-\frac{1}{2}*2\sqrt{r^2-{(r-H_1)}^2}*(r-H_1)$

$=\frac{{\mathrm{\&theta;}}_1}{360}\mathrm{\&pi;}{r}^2-\sqrt{2r{H}_1-H_1^2}*(r-H_1)$

H ₂The sectional area of corresponding circle $S_{}$ ${}_2={\mathrm{\&pi;r}}^2-[\frac{{\mathrm{\&theta;}}_2}{360}\mathrm{\&pi;}{r}^2-\frac{1}{2}*2\sqrt{r^{2-}{(H_2-r)}^2}*(H_2-r)]$

$=\frac{360-{\mathrm{\&theta;}}_2}{360}\mathrm{\&pi;}{r}^2-\sqrt{2r{H}_2-{\mathrm{<figure-callout\; id="2"\; label="H"\; filenames="HDA00003062656500031.png,HDA00003062656500032.png"\; state="\{\{state\}\}">H</figure-callout>}}_2^2}*(H_2-r)$

Identical with (1), judge V ₁, V ₂Difference whether surpass the threshold value of setting, be exactly false oil level to occur if surpass, false oil level just do not occur if surpass, thereby realize judging whether to occur false oil level situation.

Technical term is introduced: respirator is the vitals of power transformer conservator, is installed in the pipe end of conservator and air communication.When the transformer oil temperature rise, the corresponding expansion of oil meeting in the fuel tank raises the oil level in the conservator, and at this moment, portion gas is discharged through respirator in the conservator; When temperature of oil in transformer descends, the corresponding contraction of oil meeting in the fuel tank, the oil level in the conservator descends, at this moment, the inner suction part gas of conservator.Discharge or suction people air by respirator, form the normal respiration of transformer, keep the oil tank of transformer pressure equilibrium; Simultaneously, the silica gel in the respirator can absorb and enter the airborne moisture of conservator, keeps the drying of air in the conservator, prevents that the transformer insulation oil oxidation from making moist.When abnormal conditions appear in transformer breather, as in the not smooth obstruction of respirator, silica gel serious discoloration, the oil sealing cup without wet goods, all can affect the safe and reliable operation of transformer, therefore, the line service of carrying out transformer breather is particularly important.

The beneficial effects of the utility model:

1 real time reaction goes out what and the corresponding unsteady numerical relation of oil level indicator of respirator Air flow, can judge the problem of false oil level.

2 have alleviated the difficulty of line service.

3 described light electricity velocity sensors adopt photovalve as detecting element, measured variation is converted to the variation of light signal, a nearly step converts light signal to electric signal, simple in structure, flexible form, precision is high, reaction is fast, can be in conjunction with the chip microcontroller greater functionality.

4 this monitors require can both reflect the small breathing situation of respirator, small breathing (≤1ml/hr) in the situation, can show correctly that gas flow changes the oil level that causes and changes relation with the variation of actual oil level indicator, both errors are no more than 1%.

5 described light electricity velocity sensors highly sensitive, and can not stop up the vent port of respirator, can not cause unnecessary error, reliability is high.

Description of drawings

Fig. 1 is electrical connection schematic diagram of the present utility model;

Fig. 2 is device connection diagram of the present utility model;

Fig. 3 is method of work process flow diagram of the present utility model;

Fig. 4 is the installation site of light electricity velocity sensor probe of the present utility model;

Fig. 5 is the data collection rate error schematic diagram of the utility model embodiment;

Fig. 6 is the error broken line schematic diagram of the utility model embodiment;

Conservator structural representation when Fig. 7 is the utility model r 〉=H2;

Conservator structural representation when Fig. 8 is the utility model r＜H2.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing and embodiment.

Such as Fig. 1, shown in 4, a kind of transformer breather on-line monitoring instrument, comprise acquisition system, described acquisition system gathers respectively the data of oil level indicator and gasmetry element, and data are stored in the data-storage system, data in the data-storage system can be uploaded to PC by data transmission system, can also show by data presentation system, above-mentioned modules is all powered by power management module, described gasmetry element is installed in the pipe interior between respirator and the explosion stack, described explosion stack is connected with oil level indicator, and described oil level indicator is connected with Buchholz relay, and described Buchholz relay is connected with the on-load voltage regulation body.

Described gas flow measuring sensor is light electricity velocity sensor.

Described acquisition system is main MCU chip, adopts the AT89S51 single-chip microcomputer.

Described data presentation system is LCDs.

Described data-storage system is NAND FLASH chip.

Described power management module is the DC-DC control chip.

Described data transmission system is USB communication core.

As shown in Figure 2, computer control chip in the PC respectively with data presentation system in the liquid crystal display control chip, the main MCU chip of acquisition system, the NAND FLASH chip that USB communication core in the data transmission system is connected with data-storage system connects, the main MCU chip of described acquisition system respectively with the liquid crystal display control chip of data presentation system, the USB communication core of data transmission system is connected NAND FLASH chip and is connected with data-storage system, the NAND FLASH chip of described data-storage system is connected the liquid crystal display control chip with the USB communication core of data transmission system respectively and is connected with data presentation system.

Described main MCU chip is used for data acquisition and processing.

As shown in Figure 3, the method for work of described on-line monitoring instrument mainly is divided into following steps:

Step (1): beginning;

Step (2): set the sampling period;

Step (3): step-by-step counting, light electricity velocity sensor gathers the data of air mass flow;

Step (4): the data of air mass flow are inputted acquisition system behind data transformation, calculate air mass flow speed, and utilize air mass flow speed v, the long-pending S of respirator pipeline section and air effect in the time of light electricity velocity sensor t, calculate the gas flow V of the respirator of flowing through ₁

Step (5): data shift and the data storage;

Step (6): judge whether transformer false oil level occurs, if so, enter simultaneously three parallel branches of step (7-1), step (7-2), step (7-3), just finish if not;

Step (7-1): judge whether real-time demonstration, if just show in real time, just enter if not step (7-2);

Step (7-2): judge whether communication port is connected to computing machine, if with regard to data transmission, just enter if not step (7-3);

Step (7-3): judge whether it is low-voltage, if prompting is reported to the police with regard to low-voltage, just finish if not.

The specific formula for calculation of described step (4) is:

V1=v*S*t

Wherein, v represents that air mass flow speed, S represent that the long-pending and t of respirator pipeline section represents air effect in the time of light electricity velocity sensor, V1 represent the to flow through gas flow of respirator.

The computing method of the false oil level of the judgement of described step (6) are:

If r is the xsect radius of a circle, L is the length of fuel tank; H ₁For pasta changes front height, height value before namely oil level indicator changes; H ₂Be the height after the pasta variation, height value after namely oil level indicator changes; H is oil level change in elevation calculated value; θ ₁, θ ₂Be respectively pasta and change fan-shaped angle front, that pasta changes rear correspondence;

Its concrete computation process is as follows:

As shown in Figure 7, (1) is as r 〉=H ₂The time, the volume after namely oil level changes does not surpass half of conservator.Can be obtained by trigonometric function:

${\mathrm{\&theta;}}_1=2\arccos \left(\frac{r-H_1}{r}\right);$ ${\mathrm{\&theta;}}_2=2\arccos \left(\frac{r-H_2}{r}\right)$

Wherein, H ₁, H ₂Be the numerical value that reads from oil level indicator;

H ₁The sectional area of corresponding circle $S_{}$ ${}_1=\frac{{\mathrm{\&theta;}}_1}{360}\mathrm{\&pi;}{r}^2-\frac{1}{2}*2\sqrt{r^2-{(r-H_1)}^2}*(r-H_1)$

$=\frac{{\mathrm{\&theta;}}_1}{360}\mathrm{\&pi;}{r}^2-\sqrt{2r{H}_1-{\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="HDA00003062656500031.png,HDA00003062656500032.png"\; state="\{\{state\}\}">H</figure-callout>}}_1^2}*(r-H_1)$

In like manner can get H ₂The sectional area of corresponding circle $S_{}$ ${}_2=\frac{{\mathrm{\&theta;}}_1}{360}\mathrm{\&pi;}{r}^2-\sqrt{2r{H}_2-{\mathrm{<figure-callout\; id="2"\; label="H"\; filenames="HDA00003062656500031.png,HDA00003062656500032.png"\; state="\{\{state\}\}">H</figure-callout>}}_2^2}*(r-H_2)$

The volume V that oil changes in the conservator ₂=(S ₂-S ₁) the volume V that measures of * L=light electricity velocity sensor ₁

Judge V ₁, V ₂Difference whether surpass the threshold value (described threshold value is 25ml, and this threshold value can be determined according to actual conditions) of setting, be exactly false oil level to occur if surpass, false oil level just do not occur if surpass, thereby realize judging whether to occur false oil level situation;

As shown in Figure 8, (2) are as r＜H ₂The time, the volume after namely oil level changes surpasses half of conservator,

Can be obtained by trigonometric function:

${\mathrm{\&theta;}}_1=2\arccos \left(\frac{r-H_1}{r}\right)$ ${\mathrm{\&theta;}}_2=2\arccos \left(\frac{H_2-r}{r}\right)$

H ₁The sectional area of corresponding circle $S_{}$ ${}_1=\frac{{\mathrm{\&theta;}}_1}{360}\mathrm{\&pi;}{r}^2-\frac{1}{2}*2\sqrt{r^2-{(r-H_1)}^2}*(r-H_1)$

$=\frac{{\mathrm{\&theta;}}_1}{360}\mathrm{\&pi;}{r}^2-\sqrt{2r{H}_1-{\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="HDA00003062656500031.png,HDA00003062656500032.png"\; state="\{\{state\}\}">H</figure-callout>}}_1^2}*(r-H_1)$

H ₂The sectional area of corresponding circle $S_{}$ ${}_2={\mathrm{\&pi;r}}^2-[\frac{{\mathrm{\&theta;}}_2}{360}\mathrm{\&pi;}{r}^2-\frac{1}{2}*2\sqrt{r^{2-}{(H_2-r)}^2}*(H_2-r)]$

$=\frac{360-{\mathrm{\&theta;}}_2}{360}\mathrm{\&pi;}{r}^2-\sqrt{2r{H}_2-{\mathrm{<figure-callout\; id="2"\; label="H"\; filenames="HDA00003062656500031.png,HDA00003062656500032.png"\; state="\{\{state\}\}">H</figure-callout>}}_2^2}*(H_2-r)$

Identical with (1), judge V ₁, V ₂Difference whether surpass the threshold value (described threshold value is 25ml, and this threshold value can be determined according to actual conditions) of setting, be exactly false oil level to occur if surpass, false oil level just do not occur if surpass, thereby realize judging whether to occur false oil level situation.

In certain transformer station the acquisition precision of speed pickup is tested, under strong electromagnetic, has been drawn following data:

Table 1

Draw broken line graph according to the data collection rate error, as shown in Figure 5:

Can obtain following conclusion by broken line graph 5: this light electricity velocity sensor has realized measuring the data of the main transformer respirator air velocity of flowing through, and its Acquisition Error≤10E-4 (ten thousand/) is within the error range that requires.From test result, satisfied the requirement of desired value.

Under without the laboratory of strong electromagnetic condition, the accuracy of data acquisition of equipment has also been done corresponding test subsequently, the measured data in the data that the scene is measured and laboratory compare, the result shows, the data acquisition error all in allowed limits, the antijamming capability of this speed pickup meets the requirements.

This transformer breather on-line monitoring instrument is tested in certain transformer station:

Table 2

According to test findings, make error broken line graph 6.

From Fig. 6 and table 2, can find out, the utility model can small breathing (≤1ml/hr) in the situation, show that correctly gas flow changes the oil level indicator that causes and changes variation relation with actual oil level indicator, and both errors can not surpass 1%.

Although above-mentionedly by reference to the accompanying drawings embodiment of the present utility model is described; but be not the restriction to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection domain of the present utility model.

Claims (7)

1. transformer breather on-line monitoring instrument, it is characterized in that, comprise acquisition system, described acquisition system gathers respectively the data of oil level indicator and gasmetry element, and data are stored in the data-storage system, data in the data-storage system can be uploaded to PC by data transmission system, can also show by data presentation system, described gasmetry element is installed in the pipe interior between respirator and the explosion stack, described explosion stack is connected with oil level indicator, described oil level indicator is connected with Buchholz relay, and described Buchholz relay is connected with the on-load voltage regulation body.

2. a kind of transformer breather on-line monitoring instrument as claimed in claim 1 is characterized in that, described gas flow measuring sensor is light electricity velocity sensor.

3. a kind of transformer breather on-line monitoring instrument as claimed in claim 1 is characterized in that, described acquisition system is main MCU chip, adopts the AT89S51 single-chip microcomputer.

4. a kind of transformer breather on-line monitoring instrument as claimed in claim 1 is characterized in that, described data presentation system is LCDs.

5. a kind of transformer breather on-line monitoring instrument as claimed in claim 1 is characterized in that, described data-storage system is NAND FLASH chip.

6. a kind of transformer breather on-line monitoring instrument as claimed in claim 1 is characterized in that, described power management module is the DC-DC control chip.

7. a kind of transformer breather on-line monitoring instrument as claimed in claim 1 is characterized in that, described data transmission system is USB communication core.

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