CN107843707A - Two points four line voltage measurements eliminate the Transformer Winding material discrimination method that conducting rod material influences - Google Patents
Two points four line voltage measurements eliminate the Transformer Winding material discrimination method that conducting rod material influences Download PDFInfo
- Publication number
- CN107843707A CN107843707A CN201711058763.1A CN201711058763A CN107843707A CN 107843707 A CN107843707 A CN 107843707A CN 201711058763 A CN201711058763 A CN 201711058763A CN 107843707 A CN107843707 A CN 107843707A
- Authority
- CN
- China
- Prior art keywords
- conducting rod
- seebeck coefficient
- transformer winding
- transformer
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
Abstract
The present invention relates to a kind of Transformer Winding material discrimination method that two points four line voltage measurement eliminates the influence of conducting rod material, belong to transformer detection field.This method heats to the conducting rod of any phase in Three-Phase Transformer first, and conducting rod and thermoelectrical potential caused by measurement line Seebeck effect are measured, and calculate the Seebeck coefficient of conducting rod, then test point is increased in 0 phase, the phase in three-phase is heated again, and Transformer Winding and the thermoelectrical potentials caused by Seebeck effect such as lead-out wire are measured, according to the Seebeck coefficient of measured conducting rod, and the relevant parameter of the Seebeck effect of Transformer Winding calculates the Seebeck coefficient of Transformer Winding, it is analyzed by the Seebeck coefficient of Transformer Winding and the Seebeck coefficient of fine copper, determine the material of Transformer Winding.The method of the present invention, which is reset, differentiates foundation, eliminates conducting rod, measures the influence of wire rod confrontation winding material discrimination.
Description
Technical field
The invention belongs to transformer detection field, is related to a kind of two points four line voltage measurement and eliminates what conducting rod material influenceed
Transformer Winding material discrimination method.
Background technology
One of winding part important as transformer, it is operated in the ring of high field intensity, high mechanical load and thermic load
In border, therefore winding material need to have certain mechanical strength and temperature capacity while possessing good electric conductivity,
And short-time overload and short-circuit impact can be born.Copper and aluminium exist as two kinds of the most frequently used winding materials in performance etc.
Difference.The resistivity of copper and aluminium is respectively 1.7 × 10-8Ω m and 2.82 × 10-8Ω m, copper have more preferable electric conductivity.
The parameter such as the thermal conductivity of copper, Brinell hardness, tensile strength is superior to aluminium simultaneously, has preferably both mechanically and thermally；And aluminum ratio
Copper cost is low, and density is small, easily processed into type.At present there is the phenomenon that copper winding is replaced with aluminium winding in market, make purchaser
While suffering economic loss, potential safety hazard is brought to power system.
China's power transformer, which dispatches from the factory, has to pass through routine test, type approval test and special test, wherein with transformer around
The closely related experiment of group includes：Winding resistance measurement, short-circuit test, no-load test, temperature rise test etc..These experiments all can not
For detecting aluminium winding transformer.At present, electric power inspection department generally carries out winding conductor using destruction winding insulation after hanging cover
Type detection, this method wastes time and energy, the degree of accuracy is not high while has irreversibility.
Existing new winding lossless detection method, such as the patent No. CN105223329A " transformer based on pyroelectric effect
Winding material discrimination method ", a wherein phase joint for heating transformer low-pressure side, temperature difference is formed at Transformer Winding both ends,
By a wherein phase joint and temperature difference and thermoelectrical potential value between 0 phase joint, Transformer Winding material is judged.The Non-Destructive Testing side
In method, measurement line, conducting rod, winding leading-out wire are considered as to the copper material of phase same material, its major defect is：1. conducting rod material is adopted
With red copper or brass, the Seebeck coefficient of different Cu/Copper alloy material has different, and heating source connects conducting rod exit,
In the case of the identical temperature difference, the thermoelectrical potential formed between the conducting rod and winding leading-out wire (red copper) of unlike material has different；
2. conducting rod material has differences with measurement wire rod matter, while measure line head end and be connected with conducting rod, and junction away from thermal source compared with
Closely, it is poor to there is higher temperature in junction and measurement line end, therefore can form thermoelectrical potential between conducting rod and measurement line.Conducting rod-
It is superimposed to measure thermoelectrical potential and the lead-out wire-winding thermoelectrical potential of line, conducting rod-winding leading-out wire formation, winding material is sentenced
It is disconnected to have considerable influence.
The content of the invention
In view of this, it is an object of the invention to provide a kind of two points four line voltage measurement to eliminate what conducting rod material influenceed
Transformer Winding material discrimination method, reset and differentiate foundation, conducting rod, measurement wire rod confrontation winding material are eliminated so as to realize
The influence that matter differentiates, and accurately judge the purpose of Transformer Winding material.
To reach above-mentioned purpose, the present invention provides following technical scheme：
Two points four line voltage measurements eliminate the Transformer Winding material discrimination method that conducting rod material influences, including following step
Suddenly：
S1：Any phase conducting rod exit outside the phase of transformer zero sets heating module；
S2：It is S to take some installation Seebeck coefficient close to heating module one end on the conducting rod1Metal fever potential
It is S to measure line 1a and Seebeck coefficient2Metal fever potential measurement line 1b, described metal fever potential measurement line 1a, 1b's is another
One end is connected to high precision collecting unit；
S3：It is S to take some installation Seebeck coefficient away from heating module one end on the conducting rod1Metal fever potential
It is S to measure line 2a and Seebeck coefficient2Metal fever potential measurement line 2b, described metal fever potential measurement line 2a, 2b's is another
One end is connected to high precision collecting unit；
S4：Start heating module, establish temperature difference distribution in the head and end of the conducting rod, keep the temperature difference stable,
The thermoelectrical potential value V that high precision collecting unit record metal fever potential measurement line 1a, 1b, 2a, 2b are measured1a, V1b, V2a, V2b；
S5：Calculate the Seebeck coefficient of conducting rod；
S6：It is S to be taken on zero phase conducting rod of transformer and a little install Seebeck coefficient1Metal fever potential measurement line a,
Indoor temperature measurement temperature sensor a is installed simultaneously0, the temperature sensor a0And the metal fever potential measurement line a other end connects
It is connected to high precision collecting unit；
S7：Heating module is again started up, temperature difference distribution is established in Transformer Winding, keeps the temperature difference stable, it is high-precision
The thermoelectrical potential value V ' that degree collecting unit record metal fever potential measurement line 2a, 2b, a are measured2a, V '2b, V0And temperature sensor a0
Temperature value T0；
S8：The Seebeck coefficient of Transformer Winding is calculated, and according to the Seebeck coefficient of the Transformer Winding calculated
Contrasted with the Seebeck coefficient of copper, judge the material of Transformer Winding.
Further, metal fever potential measurement line 1a, 1b, 2a, 2b length is identical, and meets S1、S2With the Sai Beike of copper
Coefficient has notable difference, metal fever potential measurement line 1a, 1b, 2a, 2b long enough, ensures that 1a, 1b, 2a, 2b exist during measurement
Room temperature is down in the connection end of the high precision collecting unit.
Further, the Seebeck coefficient of conducting rod is in step S5：
Wherein：SLeadFor the Seebeck coefficient of conducting rod.
Further, in step S7, the temperature difference is established in Transformer Winding and meets remote heating module one end on conducting rod
Temperature is not less than 120 DEG C.
Further, the Seebeck coefficient of Transformer Winding is in step S8：
Wherein：
SAroundFor the Seebeck coefficient of Transformer Winding, SDrawFor the Seebeck coefficient of Transformer Winding lead-out wire, T1For temperature
Transformer Winding lead-out wire is close to the temperature of conducting rod one end, T after stable2It is close for Transformer Winding lead-out wire after temperature stabilization
The temperature of winding one end.
The beneficial effects of the present invention are：Transformer Winding material discrimination method proposed by the present invention is lossless material discrimination
Method, by externally measured acquisition conducting rod and the Seebeck coefficient of Transformer Winding so as to accurately judge Transformer Winding
Material, and the present invention considers conducting rod-measurement line thermoelectrical potential and conducting rod-lead-out wire-superimposed feelings of winding thermoelectrical potential
Condition, reset and differentiate foundation, eliminate conducting rod, measure the influence of wire rod confrontation winding material discrimination.
Brief description of the drawings
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below and carried out
Explanation：
Fig. 1 is thermo-electric method simple principle figure of the embodiment of the present invention；
Fig. 2 is transformer device structure schematic diagram of the embodiment of the present invention；
Fig. 3 is Transformer Winding material discrimination equipment connection diagram of the embodiment of the present invention；
Fig. 4 is Transformer Winding of the embodiment of the present invention and its lead-out wire, p-wire rough schematic view；
Fig. 5 a, Fig. 5 b are Temperature Field Simulation result figure of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
In order to determine the magnitude range of copper cash Transformer Winding both ends thermoelectrical potential, then need to study copper cash Transformer Winding time
The specific difference of the pyroelecthc properties of various copper materials in road.Based on the above-mentioned concrete analysis to winding loop structure, copper cash transformer returns
Influential on thermoelectrical potential mainly conducting rod, copper bar in road.Conducting rod is exposed outside, to its mechanical strength, corrosion resistance etc.
It is required that it is higher, typically there was only two kinds of red copper and brass, even aluminum winding transformer also will not typically use aluminum or steel conductive
Bar.The copper content of red copper is very high, and its purity needs close to fine copper, but for the higher occasion of this requirement of mechanical strength of conducting rod
Special forging technology is carried out to increase its intensity, has certain difference with electrician's oxygen-free copper used in copper conductor.Winding is drawn
Line will not typically be used brass, generally all be had one between T2 or T3 red coppers, with coil oxygen-free copper due to the requirement of electric conductivity
Determine difference, but difference is little.
Experiment has less relative Seebeck coefficient between measuring different copper materials, and conducting rod is usually no more than 1 μ V/K with copper cash,
0.5 μ V/K, the relative Seebeck coefficient substantially less than between copper and aluminium are usually no more than between different copper cash.Therefore copper cash transformation
The thermoelectrical potential of device should also be substantially less than aluminum winding transformer.
Thermoelectrical potential threshold value Um is mainly determined by temperature difference and material.The specific material that different producer uses should phase not to the utmost
Together, all analysis has larger difficulty, therefore is replaced using certain span, i.e. the conducting rod of Such analysis and copper cash one
As be no more than 1 μ V/K, be usually no more than 0.5 μ V/K between different copper cash.And for different Transformer Winding both ends temperature difference, thermal source
Part is all identical, the difference is that radiating condition.The heat dispersal situations of inside transformer can be more preferable with capacity increase, therefore
Winding both ends temperature difference can reduce with the increase of transformer capacity.The reduction of temperature difference will cause copper cash transformer and aluminum steel
The thermoelectrical potential value of transformer reduces, if it is determined that the value of threshold reference small capacity transformer then there is a possibility that erroneous judgement, because
This judgment threshold also should carry out certain amendment with the increase of capacity.But specifically amendment size is clearly to need largely
Emulation and analysis of experimental data obtain.
Oil immersion-type distribution transformer is usually all-sealed structure, and measurement apparatus is difficult to direct measurement to internal winding.For
Realize Non-Destructive Testing, detection method can only exposed to transformer each phase joint operate.Returned for a phase winding
Road, regard transformer as an one-port network, the simple principle of the thermo-electric method of the present embodiment is as shown in Figure 1.
The one-port network N in left side has positive and negative two terminals as detection object in the measure loop；The voltage on right side
Table is connected to two terminals by two copper material leads, measures the thermoelectrical potential value between two terminals；Simultaneously to wherein
One terminals joint is heated, and measures the temperature of two terminals joints.One co-exists at 4 and connects in loop
Head, be respectively labeled as in figure joint 1.~4..Pass through heating in method so that joint at detection object both ends 1. and
Joint 2. between the larger temperature difference be present, with reach produce pyroelectric effect condition.Based on middle conductor law, connecting lead wire is utilized
Length radiated, need to make it that 3. 4. temperature is that room temperature is equal with joint for the joint at voltmeter both ends, eliminate access voltage
Influence of the table to total thermoelectrical potential.
The Cleaning Principle in the loop be exactly measured by manufacturing under certain temperature difference condition test product both ends thermoelectrical potential and
Temperature difference, calculating judge its material.Consider simplest situation, it is one section of single material conductor to be detected test article, if copper
Material, because connecting lead wire is also copper material, then theoretical thermoelectrical potential is zero in loop；Conversely, if thermoelectrical potential is not zero, test is detected
Product material is non-fine copper material.
But be distribution transformer for product to be tested, its internal structure is more complicated, and inside has multistage conductor, many places
Joint, then need for further analysis.Detailed analysis is carried out to the structure of distribution transformer winding loop below.Distribution becomes
Depressor is mainly by shell, iron core, winding and the annex such as the major part of transformer oil four and sleeve pipe, shunting switch, radiator composition.
Wherein winding is the circuit part of transformer, and it is formed with the insulation lenticular wire or round wires coiling of paper bag.The distribution of China's production
Transformer, it is substantially all using core type transformer structure, its winding configuration is concentric winding.So-called concentric winding, is high voltage winding
Group and low pressure winding are enclosed on the outside of iron core column in the form of concentric drums, and typically by low pressure winding inside, high pressure winding
Outside.Concentric winding can be divided into laminar, spiral, continous way by winding method, be entangled with five kinds of formula, foil again.For voltage
Junior distribution transformer, dry-type transformer is then generally primarily adapted for use in using laminar, foil.Connection for winding
Mode, distribution transformer typically only have Yy0 and two kinds of Dy11.During star-like connection, as between joint A and B between two-phase joint, exist
A and the phase windings of B two, connected by neutral point between winding；During triangle junction, then there was only a phase winding between two-phase joint, be not present
Alternate tie point.Distribution transformer largely also carries shunting switch, for there is the winding loop of shunting switch, then has more again
Two joints with decomposing switch.But, based on middle conductor law, the joint at these neutral points and shunting switch is due to remote
From fire end, temperature is kept approximately constant, then can be used as middle conductor to handle, total thermoelectrical potential is not influenceed.And for from
The influence of lead (being usually copper bar) between fire end nearer conducting rod and conducting rod and winding can not then be ignored.
Therefore the present invention proposes that a kind of two points four line voltage measurement eliminates the Transformer Winding material that conducting rod material influences
Discrimination method, Fig. 2 are the transformer device structure schematic diagram of the embodiment of the present invention, and the present embodiment is by taking a phases as an example, such as Fig. 1, outside transformer
Portion is stretched out by a, b, c phase and 0 phase insulating sleeve, has conducting rod 1 in sleeve pipe, passes through winding between a phases conducting rod and a phase windings
Lead-out wire 2 connects, and is connected between a phase windings 3 and 0 phase conducting rod by copper bar 4.
Fig. 3 is Transformer Winding material discrimination equipment connection diagram of the embodiment of the present invention, as shown in figure 3, the present invention
A kind of two points four line voltage measurement eliminates the Transformer Winding material discrimination method that conducting rod material influences, and comprises the following steps that：
Set first on a phases (can be any phase of a, b, c phase, select a phases to illustrate here) conducting rod exit
Put heating module 5.
Then, a point A1 is taken on the conducting rod 1 close to heating module 5, it is S that Seebeck coefficient is connected on A11Gold
It is S to belong to thermoelectrical potential measurement line 1a and Seebeck coefficient2Metal fever potential measurement line 1b, metal fever potential measurement line 1a, 1b's
Test data accesses the corresponding port of high precision collecting unit 6, while is taken a bit on the conducting rod 1 away from heating module 5
B2, it is S to connect Seebeck coefficient on B21Metal fever potential measurement line 2a and Seebeck coefficient be S2Metal fever potential survey
Line 2b is measured, metal fever potential measurement line 2a, 2b test data also access the corresponding port of high precision collecting unit 6.
Here the Seebeck coefficient selected is S1Metal fever potential measurement line 1a, 2a and Seebeck coefficient be S2Metal
Thermoelectrical potential measurement line 1b, 2b need to meet：S1、S2Must be with the Seebeck coefficient S of coppercuThere are significant difference, while metal fever potential
Measurement line 1a, 2a, 1b, 2b want long enough, meet that B1, B2 are after heat temperature raising is handled in detection process, metal fever potential
Room temperature can be down to by measuring the temperature of line 1a, 2a, 1b, 2b at the access port of high precision collecting unit 6, ensure metal thermoelectrical potential
The length for measuring line 1a, 2a, 1b, 2b is as far as possible identical.
Then measurement is proceeded by, starts heating module 5 and conducting rod 1 is heated so that on conducting rod 1 between B1, B2
Temperature difference distribution is established, treats temperature stabilization, high precision collecting unit 6 gathers metal fever potential measurement line 1a, 1b, 2a, 2b and surveyed
The thermoelectrical potential value V obtained1a, V1b, V2a, V2b。
It can be obtained according to the rule of the position relationship of the data of measurement, and Seebeck effect：
(S1-S2)(T1b-T0)=V1a-V1b......(1)
(S1-S2)(T2b-T0)=V2a-V2b......(2)
(SLead-S1)(T1b-T2b)=V1a-V2a......(3)
Wherein：V1a, V1b, V2a, V2bMeasure, S1, S2It is known.
It can be obtained by formula (1)：
It can be obtained by formula (2)：
Then can try to achieve：
The Seebeck coefficient S of conducting rod 1 can be obtained by substituting the above to (3) abbreviationLeadFor：
Calculate the Seebeck coefficient S of conducting rod 1LeadAfterwards, set in order to which the material of measuring transformer winding also needs to supplement
Standby, as shown in Figure 30 is connected schematic diagram, the Sai Beike of the equipment of the Seebeck coefficient of measure traverse line bar in measuring transformer
It can also be used in coefficient.
The measurement of Transformer Winding material Seebeck coefficient specifically comprises the following steps：
A point B3 is selected on the conducting rod of 0 phase of transformer first, and it is S to connect Seebeck coefficient at B31Metal
Thermoelectrical potential measures line a, and sets a temperature sensor a0For measuring room temperature, metal fever potential measurement line a and temperature sensor a0
Test data access the corresponding port of high precision collecting unit 6.
Be then turned on heating module 5, conducting rod 1 heated, until conducting rod 1 B2 at temperature reach 120 DEG C with
On, keeping temperature is stable, and high precision collecting unit 6 gathers the thermoelectrical potential value V ' that metal fever potential measurement line 2a, 2b, a are measured2a,
V′2b, V0And temperature sensor a0Temperature value T0；
Abbreviation Transformer Winding, leading-out wire structure, p-wire, simplification figure is as shown in figure 4, each node temperature, potential and each
Structure Seebeck coefficient value is shown in Fig. 5 mark.Heating module power is little, and winding radiates in oil in addition, and heat transfer can not pass through
Group is passed around, winding ends temperature, which is believed that, is down to room temperature T0.Because the temperature difference is not present, winding ends to measurement line b ends thermoelectricity
Potential difference may be regarded as 0.According to known conditions and measurement result, then can be drawn to the Seebeck coefficient formula for closing conducting rod measured
The Seebeck coefficient of Transformer Winding is：
Wherein：
Wherein：SDrawFor the Seebeck coefficient of winding leading-out wire, SDrawIt is considered as red copper S hereinDraw=SCopper, T2Draw for winding and winding
Temperature at outlet node, rule of thumb analyze and simulation calculation obtains, T1For the temperature at conducting rod and winding leading-out wire node
Degree, rule of thumb analyze and simulation calculation obtains, T0For the temperature of winding ends and the junction of copper bar 4, due to winding ends
Temperature is to be down to room temperature, therefore T0For room temperature.
Fig. 5 a, Fig. 5 b are Temperature Field Simulation result figure of the embodiment of the present invention, head and end of this implementation to winding leading-out wire 2
Temperature Distribution carries out simulation analysis.Rule of thumb the temperature at A2 reaches 120 DEG C, it is necessary to the heating temperature of heating source heating module 5
It is 150 DEG C that degree, which sets heat source temperature at 150 DEG C, therefore in simulation process, and transformer initial temperature and environment temperature are 22 DEG C, temporarily
State analysis time is respectively set to 1800s and 3600s, as a result as shown in the figure：After 1800s, conducting rod head end temperature is 150
DEG C, about 100 DEG C of conducting rod end and copper bar junction, copper bar end and winding junction temperature are about 65 DEG C, because coil is grown
Degree is longer, and normal temperature is reduced to after two circle coils, the temperature of remaining high pressure winding and transformer oil be also nearly all normal temperature not
Become.The copper-aluminium joint that most concerned aluminum winding transformer is detected for pyroelectric effect method is normally at copper bar end at winding,
Judge that the joint temperature can reach 65~70 DEG C according to simulation result.And it should be normal at another copper-aluminium joint of winding ends
Temperature is constant, referred to herein as 22 DEG C, then now the temperature difference at winding both ends is 40~50 DEG C.According to the theory of pyroelectric effect method point
Analysis, copper aluminothermy potential during the temperature difference can meet the determination requirement of pyroelectric effect method up to 160~200 μ V.Therefore,
Temperature Field Simulation result effectively demonstrates the feasibility of Transformer Winding material discrimination pyroelectric effect method heating part.
T can be drawn according to simulation result empirical analysis1-T0About 90-100 DEG C of value, T2-T0About 40-50 DEG C of value,
T is taken in calculating process1-T0For 100 DEG C, T2-T0For 50 DEG C, therefore winding can be calculated according to the Seebeck coefficient formula of winding
Seebeck coefficient, because the Seebeck coefficient of copper, aluminium differs greatly (theoretical value is respectively 1.9 μ V/K and -1.2 μ V/K), by counting
The Seebeck coefficient S of the winding calculatedAroundThe material of Transformer Winding can be judged compared with the theoretical value.
Finally illustrate, preferred embodiment above only to illustrate invention technical scheme and it is unrestricted, although passing through
The present invention is described in detail for above preferred embodiment, it is to be understood by those skilled in the art that can be in shape
Various changes are made in formula and to it in details, without departing from claims of the present invention limited range.
Claims (5)
1. two points four line voltage measurements eliminate the Transformer Winding material discrimination method that conducting rod material influences, it is characterised in that：
Comprise the following steps：
S1：Any phase conducting rod exit outside the phase of transformer zero sets heating module；
S2：It is S to take some installation Seebeck coefficient close to heating module one end on the conducting rod1Metal fever potential measurement
Line 1a and Seebeck coefficient are S2Metal fever potential measurement line 1b, described metal fever potential measurement line 1a, 1b other end
It is connected to high precision collecting unit；
S3：It is S to take some installation Seebeck coefficient away from heating module one end on the conducting rod1Metal fever potential measurement
Line 2a and Seebeck coefficient are S2Metal fever potential measurement line 2b, described metal fever potential measurement line 2a, 2b other end
It is connected to high precision collecting unit；
S4：Start heating module, establish temperature difference distribution in the head and end of the conducting rod, keep the temperature difference stable, it is high-precision
The thermoelectrical potential value V that degree collecting unit record metal fever potential measurement line 1a, 1b, 2a, 2b are measured1a, V1b, V2a, V2b；
S5：Calculate the Seebeck coefficient of conducting rod；
S6：It is S to be taken on zero phase conducting rod of transformer and a little install Seebeck coefficient1Metal fever potential measurement line a, simultaneously
Indoor temperature measurement temperature sensor a is installed0, the temperature sensor a0And the metal fever potential measurement line a other end is connected to
High precision collecting unit；
S7：Heating module is again started up, temperature difference distribution is established in Transformer Winding, keeps the temperature difference stable, adopts in high precision
The thermoelectrical potential value V ' that collection unit record metal fever potential measurement line 2a, 2b, a are measured2a, V '2b, V0And temperature sensor a0Temperature
Angle value T0；
S8：The Seebeck coefficient of Transformer Winding is calculated, and according to the Seebeck coefficient and copper of the Transformer Winding calculated
Seebeck coefficient contrasted, judge the material of Transformer Winding.
2. two points four line voltage measurement according to claim 1 eliminates the Transformer Winding material mirror that conducting rod material influences
Other method, it is characterised in that：Metal fever potential measurement line 1a, 1b, 2a, 2b length is identical, and meets S1、S2With the match of copper
Seebeck coefficient has a notable difference, metal fever potential measurement line 1a, 1b, 2a, 2b long enough, ensure 1a, 1b during measurement, 2a,
2b is down to room temperature in the connection end of the high precision collecting unit.
3. two points four line voltage measurement according to claim 1 eliminates the Transformer Winding material mirror that conducting rod material influences
Other method, it is characterised in that：The Seebeck coefficient of conducting rod is in step S5：
Wherein：SLeadFor the Seebeck coefficient of conducting rod.
4. two points four line voltage measurement according to claim 3 eliminates the Transformer Winding material mirror that conducting rod material influences
Other method, it is characterised in that：In step S7, the temperature difference is established in Transformer Winding and is met on conducting rod away from heating module one end
Temperature be not less than 120 DEG C.
5. two points four line voltage measurement according to claim 4 eliminates the Transformer Winding material mirror that conducting rod material influences
Other method, it is characterised in that：The Seebeck coefficient of Transformer Winding is in step S8：
Wherein：
<mrow>
<msubsup>
<mi>T</mi>
<mrow>
<mn>2</mn>
<mi>b</mi>
</mrow>
<mo>&prime;</mo>
</msubsup>
<mo>=</mo>
<msub>
<mi>T</mi>
<mn>0</mn>
</msub>
<mo>+</mo>
<mfrac>
<mrow>
<msubsup>
<mi>V</mi>
<mrow>
<mn>2</mn>
<mi>a</mi>
</mrow>
<mo>&prime;</mo>
</msubsup>
<mo>-</mo>
<msubsup>
<mi>V</mi>
<mrow>
<mn>2</mn>
<mi>b</mi>
</mrow>
<mo>&prime;</mo>
</msubsup>
</mrow>
<mrow>
<msub>
<mi>S</mi>
<mn>1</mn>
</msub>
<mo>-</mo>
<msub>
<mi>S</mi>
<mn>2</mn>
</msub>
</mrow>
</mfrac>
</mrow>
SAroundFor the Seebeck coefficient of Transformer Winding, SDrawFor the Seebeck coefficient of Transformer Winding lead-out wire, T1After temperature stabilization
Transformer Winding lead-out wire is close to the temperature of conducting rod one end, T2It is Transformer Winding lead-out wire after temperature stabilization close to winding one
The temperature at end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711058763.1A CN107843707A (en) | 2017-11-01 | 2017-11-01 | Two points four line voltage measurements eliminate the Transformer Winding material discrimination method that conducting rod material influences |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711058763.1A CN107843707A (en) | 2017-11-01 | 2017-11-01 | Two points four line voltage measurements eliminate the Transformer Winding material discrimination method that conducting rod material influences |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107843707A true CN107843707A (en) | 2018-03-27 |
Family
ID=61681248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711058763.1A Pending CN107843707A (en) | 2017-11-01 | 2017-11-01 | Two points four line voltage measurements eliminate the Transformer Winding material discrimination method that conducting rod material influences |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107843707A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108593706A (en) * | 2018-05-18 | 2018-09-28 | 国网重庆市电力公司电力科学研究院 | A kind of both ends heating distribution transformer winding material nondestructive detection system |
| CN110231373A (en) * | 2019-06-27 | 2019-09-13 | 北华大学 | A kind of detection method and detection device of transformer winding material |
| CN113884778A (en) * | 2021-10-29 | 2022-01-04 | 浙江华电器材检测研究院有限公司 | Transformer winding parameter identification method based on high-frequency excitation |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101354388B (en) * | 2008-09-02 | 2011-11-09 | 北京大学 | Method and system for measuring quasi one-dimensional nano-material Seebeck coefficient |
| CN105973934A (en) * | 2016-07-05 | 2016-09-28 | 国网重庆市电力公司电力科学研究院 | Intelligent diagnosis device and method for transformer winding material |
-
2017
- 2017-11-01 CN CN201711058763.1A patent/CN107843707A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101354388B (en) * | 2008-09-02 | 2011-11-09 | 北京大学 | Method and system for measuring quasi one-dimensional nano-material Seebeck coefficient |
| CN105973934A (en) * | 2016-07-05 | 2016-09-28 | 国网重庆市电力公司电力科学研究院 | Intelligent diagnosis device and method for transformer winding material |
Non-Patent Citations (2)
| Title |
|---|
| 余欣玺: "基于热电效应的配电变压器绕组材质检测方法研究", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
| 杜林等: "基于热电效应的变压器绕组材质鉴别方法", 《高电压技术》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108593706A (en) * | 2018-05-18 | 2018-09-28 | 国网重庆市电力公司电力科学研究院 | A kind of both ends heating distribution transformer winding material nondestructive detection system |
| CN110231373A (en) * | 2019-06-27 | 2019-09-13 | 北华大学 | A kind of detection method and detection device of transformer winding material |
| CN110231373B (en) * | 2019-06-27 | 2021-09-24 | 北华大学 | Detection method and detection device for transformer winding material |
| CN113884778A (en) * | 2021-10-29 | 2022-01-04 | 浙江华电器材检测研究院有限公司 | Transformer winding parameter identification method based on high-frequency excitation |
| CN113884778B (en) * | 2021-10-29 | 2024-04-05 | 浙江华电器材检测研究院有限公司 | Transformer winding parameter identification method based on high-frequency excitation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107655940B (en) | Transformer winding material detection equipment and system | |
| CN102183544B (en) | Thermal-property transient measurement method and device | |
| CN107843707A (en) | Two points four line voltage measurements eliminate the Transformer Winding material discrimination method that conducting rod material influences | |
| JPS5822973B2 (en) | Red bean sprouts | |
| CN106093654A (en) | The test device of thermoelectricity module conversion efficiency of thermoelectric and method of testing thereof | |
| CN105223329B (en) | Transformer Winding material discrimination method based on pyroelectric effect | |
| CN102539964A (en) | Method for judging insulation characteristics of cross linked polyethylene (XLPE) power cables on line | |
| CN107843618A (en) | Consider the distribution transformer winding material discrimination device and method that conducting rod material influences | |
| SE517293C2 (en) | Method and apparatus for inductive measurement of geometric dimension and electrical property with opposite magnetic fields | |
| CN108344898A (en) | A kind of preformed armor rods incision position contact resistance experimental measurement method based on heat to electricity conversion | |
| CN107085007A (en) | Detect the device and method of one-dimensional micro-nanometer conducting material thermoelectricity performance parameter | |
| CN104678267A (en) | Method for indirectly measuring dielectric loss of insulation layer of cable | |
| Wilkins et al. | Multijunction thermal convertor. An accurate dc/ac transfer instrument | |
| CN107843708A (en) | 2 voltages, temperature survey eliminate the Transformer Winding material discrimination method that conducting rod material influences | |
| CN107655941B (en) | Transformer winding material detection method | |
| CN105371976A (en) | Thermal resistance temperature measuring device and temperature measuring method | |
| CN102759665B (en) | A kind of device of the AC resistance for detecting high-tension cable divided conductor | |
| CN103983528A (en) | Method for judging material of metal conductor in dry type transformer coil | |
| CN108593706A (en) | A kind of both ends heating distribution transformer winding material nondestructive detection system | |
| CN107255528A (en) | A kind of medical electrical equipment direct current winding temperature rise test device and method of testing | |
| JPS61153555A (en) | Method and device for detecting presence of substance or generation of change immediately before physical state change in fluid | |
| CN107887291A (en) | Connect the electromigration lifetime time tester and its method of testing of through hole | |
| CN107091853A (en) | A kind of Transformer Winding detects heater | |
| CN111913127A (en) | Intelligent detection device and method for tubular bus | |
| CN108680598A (en) | A kind of both ends heating distribution transformer winding material lossless detection method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180327 |