CN203785738U - Portable hydraulic transformer oil level detector for transformer substation - Google Patents

Abstract

The utility model relates to a portable hydraulic transformer oil level detector for a transformer substation. The portable hydraulic transformer oil level detector comprises an oil guide pipe, an oil storage cavity, an isolating membrane, a piezoelectric conversion module, a signal processing module and an output module. The height of oil is calculated in real time through the utilization of pressure intensity generated by transformer oil, and the real-time oil level of a transformer is obtained through the preinput parameters of a transformer expansion tank and is displayed on the output module. The portable hydraulic transformer oil level detector has the advantages as follows: the oil level can be simply and rapidly measured under the condition that the oil level is to be determined when the transformer leaks oil or an oil level gauge is in failure; liquid in the detector can be effectively isolated from the oil in the to-be-detected transformer by the isolating membrane so as to prevent the transformer oil from being polluted; a transformer valve is very conveniently connected through the adoption of a detachable oil guide pipe connector, and the portability is high; the oil level is calculated through the the hydraulic principles, the transformer oil level detector is plug and play, and the real-time performance is high; measurement can be carried out at the bottom of the transformer without climbing, so that electric shock risks caused by measurement at the expansion tank under the condition that the transformer is electrified are avoided.

Description

Portable liquid pressure type transformer oil level detecting apparatus for a kind of transformer station

Technical field

The utility model relates to the transformer oil level detecting apparatus that a kind of transformer station uses, and is specifically related to a kind of transformer station portable liquid pressure type transformer oil level detecting apparatus.

Background technology

Current oil-immersed power transformer is only installed an oil level gage based on ball float principle, in the time that transformer oil level changes, changes and converses corresponding oil level according to the angle of floating ball rod, and this type of oil level gage can only be arranged on conservator place, and observing and overhauling has inconvenience more.If oil level gage shows abnormal or transformer and has oil seepage phenomena, need to determine the true oil level in installation for transformer in the time of maintenance.The on-the-spot method that adopts U-shaped pipe is determined oil level more, the method needs the hand-held oil pipe of maintainer to ascend a height to conservator position, in the time of the charged operation of transformer, there is the risk of larger electric shock in the method, in the original just very low situation of this external oil level, adopt U-shaped pipe can emit transformer oil, have the danger of damage equipment.

Utility model content

The purpose of this utility model is to overcome existing oil level gage deficiency in use, and a kind of simple in structure, quick, convenient, accurate and safe transformer station portable liquid pressure type transformer oil level detecting apparatus is provided.

Portable liquid pressure type transformer oil level detecting apparatus for a kind of transformer station, comprises vent cap, exhausr port, shoe cream room, barrier film interface, oil guide pipe, barrier film, web member, detachable valve joint and piezoelectric sensor; Described exhausr port is positioned at the top of shoe cream room, for getting rid of the gas in shoe cream room, vent cap is used for sealing exhausr port, barrier film interface is positioned at the side of shoe cream room and has internal thread, barrier film has scalability and is enclosed within on web member, by web member screw into barrier film interface, between web member and one end of oil guide pipe, be threaded connection, web member is hollow structure, and the other end of oil guide pipe is connected with transformer valve by detachable valve joint; Described piezoelectric sensor is positioned on shoe cream room, for the pressure change in perception shoe cream room and be converted into electric signal.

Further, above-mentioned transformer station also comprises signal processing unit and display unit with portable liquid pressure type transformer oil level detecting apparatus, for converting the electric signal of piezoelectric sensor output to digital signal by AD conversion unit, go out oil level according to digital signal and the installation for transformer calculation of parameter pre-entering, and show by display unit.Described signal processing unit comprises the concrete calculating of existing industrial control module CPU(key not of the present utility model).Described industrial control module CPU adopts Siemens Simatic series CPU.

Further, two faces that have for highly different are divided at the top of shoe cream room, and described piezoelectric sensor and signal processing unit and display unit are all positioned at the face that shoe cream room overhead height is lower, and exhausr port is positioned at the face that shoe cream room overhead height is higher.

The detection method of portable liquid pressure type transformer oil level detecting apparatus for above-mentioned transformer station, specifically: inject the liquid that detects use from exhausr port toward shoe cream room, make to be full of and to become liquid and air is got rid of in shoe cream room by the telescopic adjustment liquid injection rate IR of barrier film, use vent cap that exhausr port is sealed; When measurement, pick-up unit is placed on transformer bottom same level on; Oil guide pipe internal thread is screwed in to web member inside spin, and be connected on transformer valve by detachable valve joint, open transformer valve, allow the transformer oil in conservator slowly flow into oil guide pipe by transformer valve, described piezoelectric sensor perception is because transformer oil height and piezoelectric sensor place height differs from the pressure producing and be converted into electric signal, signal processing unit is according to electric signal calculating transformer oil difference in height, and number percent oil level poor to transformer bottom level by the conservator center pre-entering, that conservator radiuscope calculates installation for transformer.

The pressure that the utility model produces by gathering transformer oil difference in height, utilize Pascal law and formula H=P/g ρ to calculate the difference in height between liquid level and pick-up unit (device bottom), and calculate the number percent oil level of installation for transformer to device bottom difference in height, conservator radius according to known conservator bottom, the utility model just utilizes this principle, can not therefore think that the utility model does not possess creativeness.

A kind of transformer station portable liquid pressure type transformer oil level detecting apparatus the utility model proposes can, in the situation that the oil levels such as Leakage in Transformer oil, oil level gage fault are to be confirmed, carry out oil-level measurement simply, quickly and safely; Adopt dismountable oil guide pipe joint, access very easily transformer valve, portable high; Utilize hydraulic principle to calculate oil level, plug and play, real-time is high.

The utility model compared with prior art has following advantage: one-piece construction is simple, easy and simple to handle, can measure in transformer bottom, need not ascend a height, and avoids the danger of the electric shock bringing in the measurement of conservator place in the charged situation of transformer; Employing barrier film design fills transformer oil in advance in shoe cream room, can avoid the equipment conservator oil reserves such as little conservator transformer or shunting switch few and further drain the oil and measure the infringement to equipment bringing; Adopt dismountable joint to be connected plug and play with transformer valve, to measure in real time, portable high.

Brief description of the drawings

Fig. 1 is the structural representation of the utility model pick-up unit.

Fig. 2 is the structural representation of a kind of embodiment of the present utility model.

Shown in figure, be: 1-vent cap; 2-exhausr port; 3-calculates and display unit; 4-piezoelectric sensor; 5-oil guide pipe interface; 6-oil guide pipe; 7-detachable valve joint; 8-shoe cream room; 9-main oil pipe; 10-fuel outlet valve oil pipe; 11-respirator oil pipe; 12-installation for transformer; Transformer oil in 13-conservator; 14-conservator bracing frame; Transformer oil in 15-main fuel tank; 16-main fuel tank; 17-fuel outlet valve; 18-respirator; 19-barrier film; 20-web member.

Embodiment

In order to understand better the technical solution of the utility model, be described in detail below in conjunction with drawings and Examples, but enforcement of the present utility model and protection domain are not limited to this.

Embodiment

As shown in Figure 1, a kind of portable liquid pressure type transformer oil level detecting apparatus, its oil return line comprises vent cap 1, exhausr port 2, shoe cream room 8, barrier film interface 5, oil guide pipe 6, barrier film 19, web member 20 and detachable valve joint 7; Its signal and show circuit comprise piezoelectric sensor 4, signal processing unit and display unit 3.Before test, barrier film 19 is inserted in to web member 20, screw into barrier film interface 5 by web member 20, from exhausr port 2 injection transformer oil or other liquid, can make to be full of transformer oil in shoe cream room 8 by the telescopic adjustment injection flow of barrier film, do not contain air and (extend liquid term of life, improve degree of accuracy), use vent cap 1 that exhausr port 2 is sealed.When measurement, measurement mechanism is placed on transformer bottom same level on.Oil guide pipe 6 internal threads are screwed in to web member inside spin, and be connected on transformer valve 17 by detachable valve joint 7, open transformer valve 17, allow the transformer oil in conservator slowly flow into oil guide pipe 6 by transformer valve 17, described piezoelectric sensor 4 perception due to transformer oil difference in height produce pressure and be converted into electric signal, signal processing unit and display unit 3 are according to electric signal calculating transformer oil difference in height, and number percent oil level poor to transformer bottom level by the conservator center pre-entering, that conservator radiuscope calculates installation for transformer.

As Fig. 2, according to practical structures, installation for transformer 12 is communicated with by main oil pipe 9 with transformer main fuel tank 16, is full of transformer oil 15 when operation in main fuel tank 16, and does not allow transformer oil 13 in installation for transformer 12 lower than 10% of conservator volume.Respirator oil pipe 11 inserts the top of installation for transformer 12, and lower end is communicated with atmosphere by respirator 18, and therefore oil guide pipe 6 depends on the oil guide pipe 6 pressure P of place with pick-up unit junction ₁for:

P ₁＝P ₀+Hgρ ₁ （1）

Wherein P ₀for atmospheric pressure; H is the difference in height bottom transformer oil 13 pastas and the transformer in installation for transformer, ρ ₁for the density of transformer oil, g is acceleration of gravity.Oil guide pipe 6 depends on the pressure P of pick-up unit place with pick-up unit junction ₂for:

P ₂＝hgρ ₂+F （2）

Wherein h is piezoelectric sensor in the pick-up unit difference in height to transformer bottom, ρ ₂for fluid density in pick-up unit shoe cream room 8, F is the liquid pressure that piezoelectric sensor 4 records, according to Pascal law P ₁=P ₂that is:

P ₀+Hgρ ₁＝hgρ ₂+F （3）

Can calculate the height difference H of transformer oil 13 pastas in installation for transformer and transformer bottom according to formula (3).Can detect installation for transformer 12 centers to transformer distance from bottom H by transformer installation diagram ₀, installation for transformer 12 radius Rs, therefore transformer oil level V is:

$V=1-\frac{\arccos [(H-H_0)/R]}{\mathrm{\π}}+\frac{(H-H_0)\sqrt{R^2-{(H-H_0)}^2}}{{\mathrm{\πR}}^2}---\left(4\right)$

Actual computation for example under:

R=1 rice, H0=9 rice, h=0.5 rice, fills transformer oil, ρ in pick-up unit ₁=ρ ₂=0.88 kg/liter, g=9.8 Newton/meter, atmospheric pressure is P ₀=10 ⁵pascal, it is 1.78 × 10 that piezoelectric sensor calculates pressure after measuring ⁵pascal, formula 3 is:

10 ⁵+H×9.8×0.88×10 ³＝0.5×9.8×0.88×10 ³+1.78×10 ⁵

Calculate H=9.5 rice.

Bringing H into formula (4), to calculate current transformer oil level be V=80.5%.

A kind of transformer station portable liquid pressure type transformer oil level detecting apparatus the utility model proposes, it calculates simple, and formula in the pressure of measuring by piezoelectricity converting unit and embodiment (3) and (4) can directly clear out transformer number percent oil level.Adopt general industry control module CPU can complete calculating, as Siemens Simatic series.The utility model adopts barrier film that the liquid in the oil in transformer to be measured and shoe cream room is effectively isolated.Because national standard is had relatively high expectations to water cut in transformer oil and air content, for fear of the liquid contamination transformer oil in shoe cream room, pick-up unit uses web member 20 to connect oil guide pipe 6 and shoe cream room 8, and on web member 20, is set with an oil resistant, withstand voltage, high temperature resistant, telescopic film as barrier film 19.And barrier film 19 coordinates the air that can drain in shoe cream room 8 with exhausr port 2.Barrier film 19 can adopt plastic sheeting or rubber film to be made.

Obviously, in accompanying drawing, describe position relationship only for exemplary illustration, can not be interpreted as restriction of the present utility model; Above-described embodiment of the present utility model is only for the utility model example is clearly described, and is not the restriction to embodiment of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also giving exhaustive to all embodiments.All any amendments of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in the protection domain of the utility model claim.

Claims (5)

1. a portable liquid pressure type transformer oil level detecting apparatus for transformer station, is characterized in that comprising vent cap (1), exhausr port (2), shoe cream room (8), barrier film interface (5), oil guide pipe (6), barrier film (19), web member (20), detachable valve joint (7) and piezoelectric sensor (4), described exhausr port (2) is positioned at the top of shoe cream room (8), be used for getting rid of the gas in shoe cream room (8), vent cap (1) is for sealing exhausr port (2), barrier film interface (5) is positioned at the side of shoe cream room (8) and has internal thread, barrier film (19) has scalability and is enclosed within on web member (20), screw into barrier film interface (5) by web member (20), between one end of web member (20) and oil guide pipe (6), be threaded connection, web member (20) is hollow structure, the other end of oil guide pipe (6) is connected with transformer valve (17) by detachable valve joint (7), it is upper that described piezoelectric sensor (4) is positioned at shoe cream room (8), for the pressure change in perception shoe cream room (8) and be converted into electric signal.

2. portable liquid pressure type transformer oil level detecting apparatus for a kind of transformer station according to claim 1, characterized by further comprising signal processing unit and display unit (3), for converting the electric signal of piezoelectric sensor (4) output to digital signal by AD conversion unit, go out oil level according to digital signal and the installation for transformer calculation of parameter pre-entering, and show by display unit.

3. portable liquid pressure type transformer oil level detecting apparatus for a kind of transformer station according to claim 1, is characterized in that described signal processing unit comprises industrial control module CPU.

4. portable liquid pressure type transformer oil level detecting apparatus for a kind of transformer station according to claim 3, is characterized in that described industrial control module CPU adopts Siemens Simatic series CPU.

5. portable liquid pressure type transformer oil level detecting apparatus for a kind of transformer station according to claim 2, two faces that have for highly different are divided at the top that it is characterized in that shoe cream room (8), described piezoelectric sensor (4) and signal processing unit and display unit (3) are all positioned at the lower face of shoe cream room (8) overhead height, and exhausr port (2) is positioned at the higher face of shoe cream room (8) overhead height.