CN111854884A - Device and method for measuring oil quantity in transformer conservator - Google Patents

Abstract

The invention provides a device and a method for measuring the oil quantity in a transformer conservator, wherein the device has the advantages of exquisite structure, simple principle and easy realization; firstly, realized the miniaturization of instrument, secondly utilize relative manometer can accurate measurement relative atmospheric pressure small change, improve measurement accuracy, thirdly the gas pressure change is little, avoids gas compression, a large amount of work of inflation process, makes the gas temperature produce great change and influences measurement accuracy. The transformer oil does not need to be transferred in the whole measuring process, and the transformer oil is prevented from being polluted or mixed into air.

Description

Device and method for measuring oil quantity in transformer conservator

Technical Field

The invention relates to the technical field of electric power overhaul, in particular to a device and a method for measuring the oil quantity in a transformer conservator.

Background

The oil conservator, namely an oil conservator, is used for adjusting the transformer oil quantity in the transformer. The metal corrugated oil conservator is widely applied to a power system due to the advantages of full sealing, high reliability and the like. However, when the metal corrugated oil storage cabinet is in a field operation working condition, the problems of inaccurate oil level indication, damaged oil level structure and the like exist, and the insulating oil is excessively or excessively injected, so that oil is supplemented after the oil level of the oil storage cabinet is low in winter, high oil level alarm is caused by overhigh oil level in summer, and even oil injection is caused by the action of a pressure release valve of a transformer, so that the safe and stable operation of field equipment is greatly influenced. At present, the corrugated oil conservator for external oil has no simple and effective method for accurately checking the oil quantity in the conservator except for observing the indication of an oil level indicator, and when the indication of the oil level indicator is abnormal, the oil conservator cannot judge whether the insulating oil is improperly injected, the oil is seriously leaked or the oil indicator has a problem.

The patent with application number 201610110407.9 provides a device and a method for detecting the oil level of a corrugated transformer conservator, which mainly rely on an ultrasonic detector to detect the oil level condition in the transformer conservator, but the ultrasonic wave may be reflected and refracted for many times in the conservator, and finally the measurement result is influenced, so that the scheme still has certain limitation.

Disclosure of Invention

Aiming at the limitation of the prior art, the invention provides a device and a method for measuring the oil quantity in a transformer conservator, and the technical scheme is as follows:

a measuring device for the oil quantity in a transformer conservator comprises: the gas collecting device comprises an inflating tool, a holding valve, a three-way joint, a pressure gauge, a stop valve and a gas collecting tool; the inflation tool is connected with the retaining valve; two ends of the three-way joint are respectively connected with the holding valve and the stop valve, and the other end of the three-way joint is used for connecting a breather pipe of a transformer conservator; the pressure gauge is arranged between the three-way joint and the holding valve; the gas collection tool is connected with the stop valve.

Compared with the prior art, the device for measuring the oil quantity in the transformer conservator has the advantages of exquisite structure, simple principle and easiness in implementation; firstly, realized the miniaturization of instrument, secondly utilize relative manometer can accurate measurement relative atmospheric pressure small change, improve measurement accuracy, thirdly the gas pressure change is little, avoids gas compression, a large amount of work of inflation process, makes the gas temperature produce great change and influences measurement accuracy. The transformer oil does not need to be transferred in the whole measuring process, and the transformer oil is prevented from being polluted or mixed into air.

In a preferred embodiment, the inflation means is an air pump.

Further, the gas collection tool is a film adhesive bag.

Furthermore, under the conditions that the atmospheric pressure is 101.3kpa and the volume of the transformer conservator is 1500L-6000L, the volume of the film rubber bag is 10L-100L.

In another preferred embodiment, the inflation tool is a compressed gas cylinder.

Further, the gas source of the compressed gas cylinder is nitrogen.

Further, the air source of the compressed air bottle is dry air.

Furthermore, the gas collection tool is a piston cylinder with a limit function.

Compared with a gas collection tool using a film rubber bag, the piston cylinder structure can further improve the measurement precision.

In a preferred embodiment, the pressure gauge is a relative pressure gauge with a full scale of 1.8 kpa.

A method for measuring the oil quantity in a transformer conservator based on the device for measuring the oil quantity in the transformer conservator comprises the following steps:

the conservator respirator is detached, and the respirator pipe is connected with the three-way joint;

inflating the conservator to a predetermined pressure using the inflation tool;

stopping inflating, closing the holding valve, opening the stop valve 5 until the gas pressure is stable, reading the residual pressure of the pressure gauge, and measuring the inflating volume of the gas collecting tool;

And obtaining the oil quantity of the conservator by using a volume pressure ratio formula according to the volume of the conservator, the preset pressure, the residual pressure and the inflation volume.

Compared with the prior art, the method utilizes the relationship that the ideal gas (air) temperature is unchanged, and the volume and the pressure are in inverse proportion to measure the volume of the air in the conservator, thereby reversely pushing the oil quantity of the conservator. The method is an effective method for measuring the oil quantity in the external oil ripple oil conservator. The oil level indicating device can effectively avoid the operation safety problem caused by oil level indicating problems such as inaccurate oil level indication and oil level structural damage of the transformer, and also provides the basis for the oil quantity in the oil conservator for carrying out the maintenance of the oil conservator. The transformer oil does not need to be transferred in the whole measuring process, and the transformer oil is prevented from being polluted or mixed into air.

Drawings

Fig. 1 is a schematic view of a device for measuring an amount of oil in a transformer conservator according to embodiment 1 of the present invention;

fig. 2 is a schematic view of a device for measuring the amount of oil in a transformer conservator according to embodiment 2 of the present invention;

fig. 3 is a schematic view of a device for measuring the amount of oil in a transformer conservator according to embodiment 3 of the present invention;

fig. 4 is a flowchart of a method for measuring an amount of oil in a transformer conservator according to embodiment 1 of the present invention;

Fig. 5 is a flowchart of a method for measuring an amount of oil in a transformer conservator according to embodiment 2 of the present invention;

fig. 6 is a flowchart of a method for measuring the amount of oil in a transformer conservator according to embodiment 3 of the present invention;

description of reference numerals: 1. an inflation tool 1; 1A, an air pump; 1B, a compressed gas cylinder; 2. a holding valve; 3. A three-way joint; 4. a pressure gauge; 5, a stop valve; 6. a gas collection means; 6A, a film plastic bag; 6B, a piston cylinder.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and are used for illustration only, and should not be construed as limiting the patent. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be understood that the embodiments described are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims. In the description of the present application, it is to be understood that the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not necessarily used to describe a particular order or sequence, nor are they to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Further, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The invention is further illustrated below with reference to the figures and examples.

Aiming at the limitation of the oil quantity metering of the oil conservator in the prior art and the technical problem caused by the fact that the patent with the application number of 201610110407.9 applies ultrasonic waves to measure the oil level, the scheme provides the following scheme.

The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.

Referring to fig. 1, a device for measuring the amount of oil in a transformer conservator includes: the device comprises an inflating tool 1, a holding valve 2, a three-way joint 3, a pressure gauge 4, a stop valve 5 and a gas collecting tool 6; the inflation tool 1 is connected with the holding valve 2; two ends of the three-way joint 3 are respectively connected with the holding valve 2 and the stop valve 5, and the other end of the three-way joint is used for connecting a respirator pipe of a transformer conservator; the pressure gauge 4 is arranged between the three-way joint 3 and the holding valve 2; the gas collecting tool 6 is connected with the stop valve 5.

Compared with the prior art, the device for measuring the oil quantity in the transformer conservator has the advantages of exquisite structure, simple principle and easiness in implementation; firstly, realized the miniaturization of instrument, secondly utilize relative manometer can accurate measurement relative atmospheric pressure small change, improve measurement accuracy, thirdly the gas pressure change is little, avoids gas compression, a large amount of work of inflation process, makes the gas temperature produce great change and influences measurement accuracy. The transformer oil does not need to be transferred in the whole measuring process, and the transformer oil is prevented from being polluted or mixed into air.

Specifically, all the parts of the invention are connected with each other through connecting pipes; the inflation tool 1 is used for inflating the conservator respirator with air to increase the pressure; the holding valve 2 is used for closing the valve when the gas pressure of the oil conservator reaches a preset pressure value, so that gas leakage is avoided; the three-way joint 3 is used for being connected with a transformer respirator connecting pipe and can be matched with the three-way joint 3 with corresponding specification according to a breathing connecting pipe; the pressure gauge 4 is used for measuring the relative pressure value of gas in the conservator (breathing pipe); the stop valve 5 is used for being closed when the oil conservator is inflated, and is opened to inflate the gas collecting tool after the inflation is finished. The gas collection tool 6 is used for containing air transferred by the conservator, and the volume change of the gas is realized.

Referring to fig. 2, in an alternative embodiment, the inflation tool 1 is an air pump 1A.

Further, the gas collecting tool 6 is a film adhesive bag 6A.

Specifically, the film bag 6A needs to be evacuated of air before it is in place.

In an alternative embodiment, the volume of the film rubber bag 6A is 10L to 100L under the conditions that the atmospheric pressure is 101.3kpa and the volume of a transformer conservator is between 1500L and 6000L.

Specifically, the oil amount in the general conservator is about 40%, the volume of the air in the conservator with the volume of 1500L-6000L is about 900-.

Preferably, the volume of the film bag 6A is 20L or 50L.

Referring to fig. 3, in another alternative embodiment, the inflation tool 1 is a compressed gas cylinder 1B.

Further, the air source of the compressed air bottle 1B is nitrogen or dry air.

Further, the gas collection tool 6 is a piston cylinder 6B with a limit.

Specifically, the piston cylinder 6B needs to be drained of air before it is inflated in place. The working principle of the piston cylinder 6B in the scheme is similar to that of a needle cylinder, and when gas rushes into a piston rod, pressure is generated to push the piston.

Compared with a gas collection tool using a film rubber bag, the piston cylinder structure can further improve the measurement precision.

In an alternative embodiment, the pressure gauge 4 is a relative pressure gauge with a full scale of 1.8 kpa.

Referring to fig. 4, a method for measuring an amount of oil in a transformer conservator based on the device for measuring an amount of oil in a transformer conservator includes the following steps:

s01, detaching the conservator respirator, and connecting the respirator pipe with the three-way joint 3;

s02, inflating the oil conservator to a preset pressure Pte by using the inflation tool 1;

s03, stopping inflating, closing the holding valve 2, opening the stop valve 5 until the gas pressure is stable, reading the residual pressure P of the pressure gauge 4, and measuring the inflating volume V of the gas collecting tool 6;

and S04, obtaining the oil quantity of the conservator by using a volume pressure ratio formula according to the volume V of the conservator, the preset pressure Pfixed, the residual pressure Presidual and the inflation volume V.

Compared with the prior art, the method utilizes the relationship that the ideal gas (air) temperature is unchanged, and the volume and the pressure are in inverse proportion to measure the volume of the air in the conservator, thereby reversely pushing the oil quantity of the conservator. The method is an effective method for measuring the oil quantity in the external oil ripple oil conservator. The oil level indicating device can effectively avoid the operation safety problem caused by oil level indicating problems such as inaccurate oil level indication and oil level structural damage of the transformer, and also provides the basis for the oil quantity in the oil conservator for carrying out the maintenance of the oil conservator. The transformer oil does not need to be transferred in the whole measuring process, and the transformer oil is prevented from being polluted or mixed into air.

Specifically, the invention is a method for measuring the volume of air in the conservator by using the relationship of the volume, pressure and temperature of ideal gas (the air under atmospheric pressure is very close to the characteristics of the ideal gas), thereby reversely pushing the oil quantity of the conservator. Ideal gas when temperature is constant, different volumes are equal to the pressure product:

P₁V₁＝P₂V₂；

(P₂+P_△)V₁＝P₂(V₁+V_△)；

V₁＝V_△*P₂/P_△；

v oil is V conservator-V₁；

The V-shaped oil conservator can inquire the oil conservator data or actually calculate by measuring the size of the oil conservator on site.

From the above formula, V₁The amount of change in the accuracy and volume of (1) and the amount of change in the pressure of (P)_△And P₂Is closely related, i.e. as long as V is present_△、P_△And P₂The measurement precision of the method meets the requirement of engineering application, and V can be ensured₁The result of (2) meets the requirements of engineering application.

The comparison of the above formula includes:

V_△charging as V;

P₂＝P₀+ P remains;

P_△leaving as pradin-prain;

specifically, referring to FIG. 5, in one embodiment, at atmospheric pressure P₀Under the condition that the volume of the transformer conservator is between 1500L and 6000L (101.3 kpa), and when the inflation tool 1 is an air pump 1A and the gas collection tool 6 is a film rubber bag 6A with the volume of 10L to 100L, the method for measuring the oil quantity in the transformer conservator specifically comprises the following steps:

s01, detaching the conservator respirator, and connecting the respirator pipe with the three-way joint 3;

S02A, inflating the oil conservator to a preset pressure Pte by using the air pump 1A;

S03A, stopping inflating, closing the holding valve 2, and opening the stop valve 5 to inflate the film adhesive bag 6A; after the gas pressure is stable, reading the residual pressure P of the pressure gauge 4, and measuring the inflation volume V of the film rubber bag 6A;

and S04, obtaining the oil quantity of the conservator by using a volume pressure ratio formula according to the volume V of the conservator, the preset pressure Pfixed, the residual pressure Presidual and the inflation volume V.

Wherein, the P is fixed to 1.5kpa (relative pressure), and the P is left to 0kpa (relative pressure, namely the pressure difference between the inside and the outside of the film bag is zero); then V₁＝V_△*P₂/P_△V & P ═ V & P-₀V charge 101.3/1.5V charge 56.3; in this embodiment, V is the volume of the film pouch.

In yet another embodiment, referring to FIG. 6, at atmospheric pressure P₀Under the condition of 101.3kpa, and when the inflation tool 1 is a compressed gas cylinder 1B and the gas collection tool 6 is a piston cylinder 6B with a limit, the method for measuring the oil quantity in the transformer conservator specifically comprises the following steps:

s01, detaching the conservator respirator, and connecting the respirator pipe with the three-way joint 3;

S02B, inflating the oil conservator to a preset pressure Pte by using the compressed gas cylinder 1B;

S03B, stopping inflating, closing the holding valve 2, and opening the stop valve 5 to inflate the piston cylinder 6B; after the gas pressure is stable, reading the residual pressure P of the pressure gauge 4, and measuring the inflation volume V of the piston cylinder 6B;

s04, determining the residual pressure Pleft and the inflation volume V according to the volume Vconservator, the predetermined pressure Pset, the residual pressure Pleft and the inflation volume V_{Charging device}And obtaining the oil quantity of the oil conservator by using a volume pressure ratio formula.

Wherein, Pfixed is 1.5kpa (relative pressure),

then V₁＝V_△*P₂/P_△＝V_△(101.3+ P remainder)/(pdeterp remainder);

it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The utility model provides a measuring device of oil mass in transformer conservator which characterized in that includes: the gas collection device comprises an inflation tool (1), a holding valve (2), a three-way joint (3), a pressure gauge (4), a stop valve (5) and a gas collection tool (6); the inflation tool (1) is connected with the retaining valve (2); two ends of the three-way joint (3) are respectively connected with the holding valve (2) and the stop valve (5), and the other end of the three-way joint is used for connecting a breather pipe of a transformer conservator; the pressure gauge (4) is arranged between the three-way joint (3) and the holding valve (2); the gas collection tool (6) is connected with the stop valve (5).

2. The device for measuring the amount of oil in a transformer conservator according to claim 1, wherein the inflation tool (1) is an air pump (1A).

3. The device for measuring the oil quantity in the transformer conservator according to claim 2, wherein the gas collecting tool (6) is a film adhesive bag (6A).

4. The device for measuring the oil quantity in the transformer conservator as claimed in claim 3, wherein the volume of the film rubber bag is 10L to 100L under the conditions that the atmospheric pressure is 101.3kpa and the volume of the transformer conservator is between 1500L and 6000L.

5. The device for measuring the amount of oil in a transformer conservator according to claim 1, wherein the inflation tool (1) is a compressed gas cylinder (1B).

6. The device for measuring the amount of oil in a transformer conservator according to claim 5, wherein the source of the compressed gas cylinder (1B) is nitrogen.

7. The device for measuring the amount of oil in a transformer conservator according to claim 5, wherein the air source of the compressed air bottle (1B) is dry air.

8. The device for measuring the oil quantity in the transformer conservator according to claim 5, wherein the gas collecting tool (6) is a piston cylinder (6B) with a limit.

9. The device for measuring the quantity of oil in a transformer conservator as claimed in claim 1, wherein the pressure gauge (4) is a relative pressure gauge with a full scale of 1.8 kpa.

10. A method for measuring the amount of oil in a transformer conservator, based on the apparatus for measuring the amount of oil in a transformer conservator according to any one of claims 1 to 9, comprising the steps of:

the conservator respirator is detached, and the respirator pipe is connected with the three-way joint (3);

inflating the conservator to a predetermined pressure using the inflation tool (1);

stopping inflating, closing the holding valve (2), opening the stop valve (5) until the gas pressure is stable, reading the residual pressure of the pressure gauge (4), and measuring the inflating volume of the gas collecting tool (6);

and obtaining the oil quantity of the conservator by using a volume pressure ratio formula according to the volume of the conservator, the preset pressure, the residual pressure and the inflation volume.

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