CN109283357A - A kind of Buchholz relay oil flow rate quantization method based on transformer insulated oil temperature and pressure - Google Patents
A kind of Buchholz relay oil flow rate quantization method based on transformer insulated oil temperature and pressure Download PDFInfo
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- CN109283357A CN109283357A CN201811358019.8A CN201811358019A CN109283357A CN 109283357 A CN109283357 A CN 109283357A CN 201811358019 A CN201811358019 A CN 201811358019A CN 109283357 A CN109283357 A CN 109283357A
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- oil
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- flow rate
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/10—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring thermal variables
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- Aviation & Aerospace Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The present invention discloses a kind of Buchholz relay oil flow rate quantization method based on transformer insulated oil temperature and pressure; it is related to transformer safety stable operation field; the following steps are included: analyzing insulating oil temperature profile when protection external area error occurs for transformer first, while insulating oil pressure feature at this time is obtained using the second law of thermodynamics；When utilizing external area error later, temperature, which increases, makes insulating oil expansion and pressure increase make to generate the mathematic(al) representation that pressure difference obtains they and Buchholz relay oil flow rate respectively between oil tank of transformer and conservator；The finally influence of comprehensive insulation oil temperature and pressure, the mathematic(al) representation of Buchholz relay oil flow rate when obtaining external area error.The oil flow rate of Buchholz relay when energy Accurate Analysis transformer external area error of the present invention provides important guiding for analysis protection malfunction work.
Description
Technical field
The present invention is a kind of new Buchholz relay oil flow rate quantization method, be it is a kind of based on transformer external area error when it is exhausted
The oil flow rate quantization method of edge oil temperature and pressure belongs to transformer safety stable operation field.
Background technique
Transformer is the core element in electric system, and failure-free operation is determining for electric system energy safe and stable operation
One of qualitative factor.Current transformer main protection is mainly collectively constituted by protection and differential protection, wherein protection
It is the oil flow rate surveyed based on Buchholz relay and acts, it can the various troubles inside the sample space of sensitive, quick reflection transformer.But
In transformer actual motion, the malfunction of protection happens occasionally, i.e., when external area error occurs for transformer, Buchholz relay
Measured oil stream speed has been more than the setting valve of Buchholz relay, so as to cause the malfunction of protection.Due to transformer
The change procedure of non-electrical characteristic quantity when external area error is all sufficiently complex, therefore Buchholz relay oil flow rate at this time is accelerated
The reason of not yet obtain accurate quantitative analysis results.
For this problem of protection malfunction, it is quite necessary to go to find out more accurate method and carry out quantitative analysis transformation
The oil flow rate of Buchholz relay when device external area error.It is non-to describe this that some quantization methods have been proposed in scholar both domestic and external
Electric characteristic amount, document " the Transformer Heavy Gas false protection analysis of causes caused by sequential short circuit " propose to insulate when external area error
It is the main cause for causing Buchholz relay oil flow rate to be accelerated that oil temperature, which rises, and proposes the setting valve for increasing Buchholz relay and mention
High methane relay time setting value solves the problems, such as protection malfunction；" transformer based on pressure characteristic is digital for document
Protective strategy " then propose that insulating oil pressure rises sharply this quantitative model to describe Buchholz relay oil stream when transformer external area error
The phenomenon that speed is accelerated.But the temperature of insulating oil and pressure are integrated consideration by few scholars, therefore comprehensively consider the two
Factor to flow through oil flow rate at Buchholz relay when quantitative analysis transformer external area error and accelerates this non-electrical fault signature
Amount, is a good innovative point.
Summary of the invention
Accelerate this phenomenon to flow through oil flow rate at Buchholz relay when quantitative analysis transformer external area error, the present invention
" a kind of Buchholz relay oil flow rate quantization method based on transformer insulated oil temperature and pressure " has comprehensively considered transformer area
The temperature of insulating oil and pressure feature when outer failure, so that the quantitative analysis method is more accurate.On the one hand, practical operating experiences
Show that insulation oil temperature is existed simultaneously when transformer external area error increases the phenomenon that rising with pressure；On the other hand, by heating power
Law is learned it is found that the temperature and pressure of insulating oil are a pair of associated amounts, therefore the two should be integrated to consideration.
The invention mainly comprises the following steps:
Step 1: the temperature profile and pressure feature of insulating oil when quantitative analysis transformer external area error；
Step 2: the temperature profile and pressure feature of quantitative analysis insulating oil and the relationship of Buchholz relay oil stream speed；
Step 3: the quantitative model of Buchholz relay oil flow rate when obtaining transformer external area error.
Detailed description of the invention
Scheme the technical principle flow chart first is that of the invention
Specific embodiment
The specific steps of the present invention are as follows:
Step 1: the temperature profile and pressure feature of insulating oil when quantitative analysis transformer external area error
(1) when quantitative analysis transformer external area error insulating oil temperature profile
When troubles inside the sample space occurs for transformer, the electric current for flowing through transformer winding will increase, so that a large amount of heat can be generated,
Since, there are biggish temperature difference, transformer oil will absorb a large amount of heat, in addition between winding and transformer insulation oil
Fault time is very short and transformer winding is fully immersed in transformer insulation oil, it is believed that heat produced by winding is most of
Be transmitted in insulating oil and the development of evil in febrile disease in order to insulating oil it is interior can, and then the temperature of insulating oil can be made to increase.
We can survey temperature field data in transformer, obtain the coordinate and temperature value at different location, then
Using measured data, the expression formula of the transient temperature and area relationship in transformer is obtained by curve matching are as follows:
F (T)=a0+a1T+a2T2+...+anTn
S is corresponding area under specific temperature in formula；aiFor temperature coefficient in transformer；Ti=φ1(x, y, z) is temperature
The temperature funtion of field any position；(x, y, z) is the three-dimensional coordinate of any position in transformer.
(2) when quantitative analysis transformer external area error insulating oil pressure feature
By thermodynamics it is found that when can increase in transformer insulation oil, other than temperature can increase, pressure will also be risen
Height, expression formula are as follows:
Wherein p1, V1, T1Insulating oil pressure respectively before failure, volume and temperature；p2, V2, T2For the insulation after failure
Oil pressure is strong, volume and temperature；K is constant.When transformer breaks down, since fault time is very short, relative to whole insulation
The volume of oil near-sighted can think that the swelling volume of insulating oil is zero, i.e. V1=V2, then appealing formula can simplify are as follows:
So the quantitative model of pressure can be obtained by the quantitative model of temperature are as follows:
P=kT=kf (T)
Step 2: the temperature profile and pressure feature of quantitative analysis insulating oil and the relationship of Buchholz relay oil stream speed
(1) relationship of the temperature profile of quantitative analysis insulating oil and oil stream speed at Buchholz relay
For transformer insulation oil, meeting expanded by heating, due to only passing through one between oil tank of transformer and conservator
The lesser oil connecting pipe of internal diameter is connected, therefore expanded by heating part all will pour into conservator by oil connecting pipe, so that watt
This relay oil flow rate is accelerated, this phenomenon, which can be used to lower mathematic(al) representation, to be indicated:
I.e. transformer occurs to flow through the oil stream speed v at Buchholz relay when external area errorTEqual to unit time interior insulation
Oil volume swell increment dV/dt divided by oil connecting pipe sectional area S；
Mathematic(al) representation between the swelling volume V and insulating oil temperature difference Δ T of transformer insulation oil are as follows:
V=λ V0ΔT
λ is the coefficient of expansion in formula, can use 0.0007；V0For transformer insulation oil total volume before failure；Δ T=T1-T2For event
Hinder the temperature difference of front and back.
It can then obtain the temperature and Buchholz relay oil stream speed v of insulating oilTRelationship are as follows:
Dt=t in formula2-t1For trouble duration.
(2) relationship of the pressure feature of quantitative analysis insulating oil and Buchholz relay oil stream speed
When transformer fault, the pressure of insulating oil will be increased, and above conservator be air, and pressure is about atmospheric pressure
p0, therefore oil connecting pipe both ends will generate a larger pressure difference after transformer fault, the insulating oil of the big one end of pressure will
Pour into the small one end of pressure.Therefore it calculates calculating Buchholz relay oil stream speed at this time and can use for reference " pressure flow in pipe model ",
Specific calculating process is as follows:
The resistivity s for calculating the oil connecting pipe between conservator and transformer first, from Shievieliev F A'formula:
Wherein θ is a constant related with kind of liquid in inner surface of pipeline material and pipeline, can be obtained by tabling look-up；
D is the interior diameter of pipeline.
Determine the acting head difference Δ H at oil connecting pipe both ends, expression formula again later are as follows:
Wherein Δ p=p2-p0For the pressure difference at oil connecting pipe both ends, p2For the insulating oil pressure after failure, p0For atmospheric pressure
By force；ρOilFor the density of insulating oil；G is acceleration of gravity.
And then it can obtain the oil stream speed v flowed through at Buchholz relaypExpression formula are as follows:
L is the total length of oil connecting pipe in formula.
Step 3: the quantitative model of Buchholz relay oil flow rate when obtaining transformer external area error
By the content in step 1 and step 2 it is found that when external area error occurs for transformer, Buchholz relay oil stream speed
Quickening is to be increased to generate with pressure increase collective effect by insulation oil temperature, it therefore follows that gas when transformer external area error
The quantitative model of relay oil flow rate v are as follows:
It is to sum up told, can obtain the Buchholz relay based on insulating oil pressure and temperature when external area error occurs for transformer
Oil flow rate quantitative model.
Embodiments above is merely to illustrate the present invention, and not limitation of the present invention, in relation to the common of technical field
Technical staff can also make a variety of changes and modification without departing from the spirit and scope of the present invention, therefore all
Equivalent technical solution also belongs to protection category of the invention.
Claims (3)
1. a kind of Buchholz relay oil flow rate quantization method based on transformer insulated oil temperature and pressure, it is characterised in that:
(1) temperature and pressure of insulating oil when comprehensively considering transformer external area error, and the two is quantified；
(2) mathematic(al) representation of insulation oil temperature and pressure and oil flow rate at Buchholz relay when determining external area error.
2. being told according to claim 1 a kind of based on transformer insulated oil temperature and the quantization of the Buchholz relay oil flow rate of pressure
Method, which is characterized in that the temperature and pressure of insulating oil when affiliated step 1) comprehensively considers transformer external area error, and to this two
Person quantifies；First analyze transformer protection external area error when heat production and heat dissipation characteristics, later by analysis and
The distribution mathematic(al) representation of insulation oil temperature, is then obtained using the second law of thermodynamics when actual measurement obtains transformer external area error
The quantization profile mathematic(al) representation of insulating oil pressure.
3. oil stream rate at a kind of Buchholz relay based on transformer insulated oil temperature and pressure told according to claim 1
Change method, which is characterized in that insulation oil temperature and pressure and oil stream at Buchholz relay when affiliated step 2) determines external area error
The mathematic(al) representation of speed；The mathematical expression of temperature Yu Buchholz relay oil flow rate is obtained first with oily expanded by heating this characteristic
Formula, post analysis insulating oil pressure increase caused by pressure difference between oil tank of transformer and conservator, and utilize " pressure flow in pipe
Model " obtains the mathematic(al) representation of Buchholz relay oil flow rate and pressure.
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| CN201811358019.8A CN109283357A (en) | 2018-11-15 | 2018-11-15 | A kind of Buchholz relay oil flow rate quantization method based on transformer insulated oil temperature and pressure |
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| CN201811358019.8A CN109283357A (en) | 2018-11-15 | 2018-11-15 | A kind of Buchholz relay oil flow rate quantization method based on transformer insulated oil temperature and pressure |
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| CN104297648A (en) * | 2014-10-17 | 2015-01-21 | 国网上海市电力公司 | Temperature and flow speed control device used for transformer oil insulation heat ageing test and test method thereof |
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| CN106019136A (en) * | 2016-07-06 | 2016-10-12 | 国家电网公司 | Method for verifying gas relay flow velocity value by replacing oil medium with gas medium |
| CN106324489A (en) * | 2015-07-03 | 2017-01-11 | 长沙理工大学 | Modeling method based on relationship between internal fault of smoothing reactor and oil flow rate |
| WO2017156331A1 (en) * | 2016-03-09 | 2017-09-14 | Conocophillips Company | Production logs from distributed acoustic sensors |
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| EP2612115A1 (en) * | 2010-09-03 | 2013-07-10 | Los Alamos National Security LLC | Method for noninvasive determination of acoustic properties of fluids inside pipes |
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| CN104297648A (en) * | 2014-10-17 | 2015-01-21 | 国网上海市电力公司 | Temperature and flow speed control device used for transformer oil insulation heat ageing test and test method thereof |
| CN104569481A (en) * | 2014-12-03 | 2015-04-29 | 国网河南省电力公司电力科学研究院 | Oil flow speed acquiring system for gas relay, and heavy-gas setting-value verifying method |
| CN104834815A (en) * | 2015-05-08 | 2015-08-12 | 国网河南省电力公司电力科学研究院 | Modeling method based on gas relay oil flow rate and transient temperature field relevancy |
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