CN103578041B - Test data tracing analysis relative method - Google Patents
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- CN103578041B CN103578041B CN201310475648.XA CN201310475648A CN103578041B CN 103578041 B CN103578041 B CN 103578041B CN 201310475648 A CN201310475648 A CN 201310475648A CN 103578041 B CN103578041 B CN 103578041B
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Abstract
The invention discloses a kind of test data tracing analysis relative method, comprise the following steps: 1. electrical equipment is after different times carries out light maintenance or overhaul, when carrying out preventive trial, the actual measured value that the test of equipment after testing obtains is input in Excel form, carries out storing, filing, certainly；2. on the basis of described Excel form, carry out equation editing, computing formula is set, actual measured value over the years is converted, obtains scaled value；3. utilize the function of Excel, generate the data and curves of scaled value over the years respectively；4. compare the corresponding relation between the data and curves of scaled value over the years, search the defect that described electrical equipment exists.This test data tracing analysis relative method, possesses practicality, comparability, ageing and operability.
Description
Technical field
The present invention relates to a kind of analytical comparison, particularly relate to a kind of test data tracing analysis relative method.
Background technology
The Jiayu Pass Hong Sheng electric heating Co., Ltd is under the jurisdiction of Jiu Gang group, existing thermal power generation facility 12/set, installation
Capacity is 1810MW, it is contemplated that to " 12 " end, total installation of generating capacity is up to 3200MW.The transformation that separate unit generating set matches
Device 12, high-voltage motor 20, low voltage motor 30, primary cut-out 36 and bus, spark gap, transformer etc..Foundation
" overhaul of the equipments directive/guide ", generating set should light maintenance annually, an overhaul in 4 years, maintenance is formed substantial amounts of the most preventative
Test data, test report, these test datas need manual record, on-the-spot conversion, therefore, to testing crew and test over the years
Data carry out contrasting, analyze and judge in time that equipment health level, abatement apparatus fault bring bigger difficulty.
Summary of the invention
It is an object of the invention to provide a kind of test data tracing analysis relative method easy to use.
For achieving the above object, the present invention adopts the technical scheme that:
A kind of test data tracing analysis relative method, comprises the following steps:
Step 1: electrical equipment is after different times carries out light maintenance or overhaul, when carrying out preventive trial, will after testing
The actual measured value that equipment test obtains is input in Excel form, carries out storing, filing, certainly；
Step 2: on the basis of described Excel form, carry out equation editing, computing formula is set, by reality over the years
Measured value converts, and obtains scaled value；
Step 3: utilize the function of Excel, generate the data and curves of scaled value over the years respectively；
Step 4: the relatively corresponding relation between the data and curves of scaled value over the years, searches lacking of described electrical equipment existence
Fall into.
Electrical equipment described in step 1 includes electromotor, motor, transformator, bus, transformer, spark gap or cable.
Scaled value described in step 2 refers to the scaled value when standard temperature 75 DEG C or 20 DEG C.
Following pass of converting is there is between the D.C. resistance of described motor or the scaled value of insulation resistance and actual measured value
System:, in formula: Rt2For being scaled to standard temperature t2Time, the D.C. resistance of winding or insulation resistance；Rt1For reality
Temperature t during survey1Time, the D.C. resistance of winding or insulation resistance；t2It is 75 DEG C, t1For temperature during actual measurement；T is unlike material
The temperature conversion factor of equipment, the temperature conversion factor of copper material is 235, and the temperature conversion factor of aluminium is 225.
Following conversion relation is there is between scaled value and the actual measured value of the leakage current of described transformator:
It2=It1×1.60.1(t2-t1), in formula: It2For being scaled to standard temperature t2Time leakage current values, unit is μ A；
It1For temperature t during actual measurement1Time measurement leakage current values, unit is μ A；t2It is 75 DEG C, t1For temperature during actual measurement.
Following conversion relation is there is between scaled value and the actual measured value of the dielectric dissipation factor of described transformator:
tanδt2=tan δ t1×1.30.1(t1-t2), in formula: tan δ t2For being scaled to standard temperature t2Time dielectric loss because of
Number, tan δ t1For temperature t during actual measurement1Time dielectric dissipation factor；t2It is 20 DEG C, t1For temperature during actual measurement.
The test data tracing analysis relative method using the present invention to provide, provides the benefit that:
1. practicality: the method can be applied to the test data over the years of same electrical equipment the most neatly and be analyzed
With compare, it is possible to the test data in the same year applying to the identical distinct device of capacity is analyzed and compares.
2. comparability: be analyzed comparing with data over the years by the curve that test data is formed, utilize the change of curve to become
Gesture, can consersion unit operating condition intuitively, check the defect that equipment exists, the degradation trend of analytical equipment, take in time
Pre-control measures, reduces the fault rate of equipment production run.
The most ageing: equipment control can be made progressively to tend to standardization, save the time of data of browsing, improve work effect
Rate.
4. operability: used software is conventional most basic office office software, uses easy to learn, left-hand seat
Hurry up.
Accompanying drawing explanation
Fig. 1 is that the D.C. resistance of motor of the present invention stores signal table of filing in Excel form.
Fig. 2 is that the D.C. resistance of motor of the present invention converts signal table in Excel form.
Fig. 3 is that the D.C. resistance of motor of the present invention curve in Excel form separates comparison diagram.
Fig. 4 is the D.C. resistance of motor of the present invention curve combining comparison diagram in Excel form.
Fig. 5 is that transformer leakage electric current of the present invention stores signal table of filing in Exce1 form.
Fig. 6 is that transformer leakage electric current of the present invention converts signal table in Exce1 form.
Fig. 7 is transformer leakage electric current of the present invention curve combining comparison diagram in Exce1 form.
Fig. 8 is that transformator dielectric dissipation factor of the present invention stores signal table of filing in Exce1 form.
Fig. 9 is that transformator dielectric dissipation factor of the present invention converts signal table in Exce1 form.
Figure 10 is transformator dielectric dissipation factor of the present invention curve combining comparison diagram in Exce1 form.
Detailed description of the invention
Below in conjunction with specific embodiment and accompanying drawing thereof, the present invention is described in further detail.
Embodiment 1
Condense as a example by the D.C. resistance of pump motor test by new #3 generating set A below, be analyzed comparative descriptions.
The test data tracing analysis relative method that the present invention provides, comprises the following steps:
Step 1: motor is after different times carries out light maintenance or overhaul, when carrying out preventive trial, will set after testing
The D.C. resistance actual measured value of the winding that standby test obtains is input in Excel form, carries out storing, filing, certainly.Such as figure
Shown in 1, after overhauling 2009～2012, the D.C. resistance actual measured value of the winding that detection obtains is input to Excel form
In, carry out storing, filing, certainly.
The D.C. resistance actual measured value of winding refers to that testing crew uses test apparatus to test at the scene, from measurement
The numerical value read in instrument.Three-phase dc resistance represents with AB, AC, BC respectively, and testing crew uses QJ84 unidirectional current at the scene
Resistance measuring instrument measures, and reads AB phase D.C. resistance actual measured value, the actual survey of AC phase D.C. resistance from measuring instruments
Value, BC phase D.C. resistance actual value are measured.
Step 2: as in figure 2 it is shown, on the basis of Excel form, carry out equation editing, willArrange
Become the computing formula of Excel form, straight by detecting the actual measured value AB phase D.C. resistance actual measured value that obtains, AC phase over the years
Leakage resistance actual measured value, BC phase D.C. resistance actual value are measured and are converted according to formula, respectively obtain 75 DEG C of direct currents of AB phase
Resistance scaled value, 75 DEG C of D.C. resistance scaled values of AC phase, 75 DEG C of D.C. resistance scaled values of BC phase.
Scaled value refers to the D.C. resistance actual measured value of winding that will obtain at a temperature of when actual measurement, is scaled standard
Numerical value at temperature 75 DEG C.Owing to actual measured value is had a great impact by ambient temperature, for the ease of by this preventative examination
Test the actual measured value obtained, compare with the actual measured value obtained under different temperatures environment over the years, it is necessary to by difference
At a temperature of the survey actual amplitudes that obtains, be converted to unified standard temperature 75 DEG C and compare.
New #3 generating set A condenses the D.C. resistance of pump motor in the scaled value of standard temperature 75 DEG C and actual measured value
Between there is following relation:, in formula: Rt2For being scaled to standard temperature t2Time, the D.C. resistance or exhausted of winding
Edge resistance；Rt1For temperature t during actual measurement1Time, the D.C. resistance of winding or insulation resistance；t2=75 DEG C, t1=25℃；T is different materials
The temperature conversion factor of matter equipment, the temperature conversion factor of copper material is 235, and the temperature conversion factor of aluminium is 225.
Step 3: utilize the function of Excel, the data and curves of scaled value when generating 75 DEG C of standard temperatures over the years respectively.Such as figure
Shown in 3 and Fig. 4, generate the data and curves of AB, AC, BC phase resistance scaled value respectively.
Step 4: corresponding relation between scaled value curve during 75 DEG C of standard temperatures over the years in comparison diagram 3 and Fig. 4, searches electricity
The defect that motivation exists.
Compared by the curve chart of 2009～2012, it can be seen that 75 DEG C of D.C. resistance scaled values of AC phase are more than it
75 DEG C of D.C. resistance scaled values that he is biphase, and 75 DEG C of D.C. resistance scaled values of AC phase in 2012 are significantly greater than the first three years
Value, it was demonstrated that this motor is defective.Need further quickly to judge to determine trouble location, facilitate maintainer to process.
Concrete trouble location judges as follows:
1. first determine whether into bolt looseness at the lead-in wire of motor winding and sleeve pipe, have superheating phenomenon.Remind maintainer's inspection
Look into lead-in wire bolt；If lead-in wire bolt is normal, then enter next step.
The most secondly being judged as motor internal fault, stator winding conductor bars in electrical machines weld ftractures.Carry out next step test, find out
The position split, welds again.
3. re-starting test, until qualified, electrical equipment can put into operation.
Above-mentioned steps, is only that the scaled value curve over the years of same equipment has been carried out relative analysis.The present invention provides
Method, it is also possible to be applied to the identical distinct device of capacity the same year electrical equipment test data be analyzed and compare.
If there being 10 motor of coal crusher, each equipment design parameter of these 10 motor of coal crusher is the most identical, for D.C. resistance
This pilot project, can make curve 75 DEG C of D.C. resistance scaled values of three-phase of 10 motors by above step and compare
Relatively, when finding substantially to change in certain corresponding coordinate points, it can be determined that go out this motor defective.
Embodiment 2
Below as a example by new #4 station service transformer leakage current test, it is analyzed comparative descriptions.
The test data tracing analysis relative method that the present invention provides, comprises the following steps:
Step 1:#4 station service transformer is after different times carries out light maintenance or overhaul, when carrying out preventive trial,
The leakage current actual measured value that the test of equipment after testing obtains is input in Excel form, carries out storing, filing, certainly.
As it is shown in figure 5, by after, 2008 and maintenance in 2012 in 2004, the leakage current actual measured value that detection obtains is input to
In Excel form, carry out storing, filing, certainly.
Leakage current actual measured value refers to that testing crew uses test apparatus to test at the scene, from measuring instruments
The numerical value read.Testing crew uses HTFDZLY DC break down voltage instrument to add #4 station service transformer high-pressure side winding respectively
During 10KV, 20KV, 30KV, 40KV voltage, Leakage Current IA, IB, IC, ID of generation represent, read from measuring instruments
IAt1Leakage current actual measured value, IBt1Leakage current actual measured value, ICt1Leakage current actual measured value, IDt1Leakage electricity
Stream actual measured value.
Step 2: as shown in Figure 6, on the basis of Excel form, carries out equation editing, by It2=It1×1.60.1(t2-t1)
It is arranged to the computing formula of Excel form, actual measured value IA obtained will be detected over the yearst1Leakage current actual measured value,
IBt1Leakage current actual measured value, ICt1Leakage current actual measured value and IDt1Leakage current actual measured value, according to formula
Convert, respectively obtain IAt2Leakage current scaled value, IBt2Leakage current scaled value, ICt2Leakage current scaled value and IDt2
Leakage current scaled value.
Scaled value refers to, by the leakage current actual measured value that obtains at a temperature of when actual measurement, be scaled standard temperature 75
Numerical value at DEG C.Owing to actual measured value is had a great impact by ambient temperature, for the ease of this preventive trial is obtained
Actual measured value, compare with the actual measured value obtained under different temperatures environment over the years, it is necessary to by under different temperatures
The survey actual amplitudes obtained, is converted to unified standard temperature 75 DEG C and compares.
Following conversion relation is there is between scaled value and the actual measured value of the leakage current of #4 station service transformer:
It2=It1×1.60.1(t2-t1), in formula: It2For being scaled to standard temperature t2Time leakage current values, unit is μ A；
It1For temperature t during actual measurement1Time measurement leakage current values, unit is μ A；t2=75 DEG C, t1=25℃。
Step 3: utilize the function of Excel, the data and curves of scaled value when generating 75 DEG C of standard temperatures over the years respectively.Such as figure
Shown in 7, generate new #4 station service transformer leakage current actual measured value and the data of leakage current values when 75 DEG C respectively
Curve.
Step 4: corresponding relation between scaled value curve during 75 DEG C of standard temperatures over the years in comparison diagram 7, searches #4 station-service
The defect that high-tension transformer exists.
Compared by the curve chart of, 2008 and in 2004 in 2012, it can be seen that the curve of 2012 is obvious
More precipitous than the curve of the first two years.By curvilinear motion, finding that leakage current differs greatly, this equipment can not put into operation.More enter one
Step quickly judges to determine trouble location, facilitates maintainer to process.
Concrete trouble location judges as follows:
First weigh our process of the test either with or without problem, go through test connection, shielding and institute's Accelerated Life electricity
Whether pressure meets regulation.
The most secondly determine whether that moisture invades insulating inner.After dried, again test.
The most again judge that electric insulation is the most aging.
Embodiment 3
Below as a example by new #2 main transformer dielectric dissipation factor, it is analyzed comparative descriptions.
The test data tracing analysis relative method that the present invention provides, comprises the following steps:
Step 1: transformator is after different times carries out light maintenance or overhaul, when carrying out preventive trial, will set after testing
The dielectric dissipation factor tan δ that standby test obtainst1Actual measured value is input in Excel form, carries out storing, filing, certainly.
As shown in Figure 8, after, 2007 and maintenance in 2011 in 2004, the dielectric dissipation factor tan δ that detection obtainst1Actual measured value
It is input in Excel form, carries out storing, filing, certainly.
Dielectric dissipation factor actual measured value refers to that testing crew uses test apparatus to test at the scene, from measuring instrument
The numerical value read on table.Testing crew uses DDA20 high voltage dielectric loss tester to measure new #2 main transformer high pressure winding to low
Pressure winding, iron core and the dielectric dissipation factor tan δ on groundAt1Actual measured value represents, low pressure winding to high pressure winding, iron core and
The dielectric dissipation factor tan δ on groundBt1Actual measured value represents, the dielectric dissipation factor on iron core and ground is used by high-low pressure winding
tanδCt1Actual measured value represents.
Step 2: as it is shown in figure 9, on the basis of Excel form, carry out equation editing, will
tanδt2=tan δ t1×1.30.1(t1-t2)It is arranged to the computing formula of Excel form, Jie obtained will be detected over the years
Matter loss factor actual measured value converts according to formula, respectively obtains dielectric dissipation factor changing when 20 DEG C of standard temperatures
Calculation value.
Scaled value refers to, by the dielectric dissipation factor actual measured value that obtains at a temperature of when actual measurement, be scaled standard temperature
Numerical value at spending 75 DEG C.Owing to actual measured value is had a great impact by ambient temperature, for the ease of by this preventive trial
The actual measured value obtained, compares with the actual measured value obtained under different temperatures environment over the years, it is necessary to by not equality of temperature
The survey actual amplitudes obtained under degree, is converted to unified standard temperature 20 DEG C and compares.
Following conversion relation is there is between scaled value and the actual measured value of the dielectric dissipation factor of transformator:
tanδt2=tan δ t1×1.30.1(t1-t2), in formula: tan δ t2For being scaled to standard temperature t2Time dielectric loss because of
Number, tan δ t1For temperature t during actual measurement1Time dielectric dissipation factor；t2=20 DEG C, t1=25℃。
Step 3: utilize the function of Excel, generates the data and curves of 20 DEG C of standard temperature scaled values over the years respectively.Such as Figure 10
Shown in, generate the actual measured value of new #2 main transformer dielectric dissipation factor, the data and curves of 20 DEG C of scaled values respectively.
Step 4: compare the corresponding relation between 20 DEG C of standard temperature scaled value curves over the years in Figure 10, searches transformator and sets
The standby defect existed.
Compared by the curve chart of 2009～2012, it can be seen that the curve of 2012 is significantly higher than the first two years
's.By curvilinear motion, find tan δCt2Bigger than normal, illustrate transformer insulated defective, equipment can not come into operation.
Concrete trouble location judges as follows: first check for sleeve of main transformer, because when carrying out electric preventive test, it is impossible to
Sleeve pipe is connected with internal winding and takes apart, therefore, first get rid of the sleeve pipe impact on result of the test.If sleeve surface flawless,
Insulate qualified, be then judged to high pressure winding and the low pressure winding humidified insulation to iron core, it is proposed that maintainer uses fuel tank iron loss
Evacuation seasoning is dried process.Test after being dried, until pass the test.
Claims (4)
1. a test data tracing analysis relative method, it is characterised in that comprise the following steps:
Step 1: electrical equipment is after different times carries out light maintenance or overhaul, when carrying out preventive trial, by equipment after testing
The actual measured value that test obtains is input in Excel form, carries out storing, filing, certainly；Described electrical equipment includes generating
Mechanical, electrical motivation, transformator, bus, transformer, spark gap or cable；The D.C. resistance of described motor or changing of insulation resistance
Following conversion relation is there is between calculation value and actual measured value:, in formula: Rt2For being scaled to standard temperature t2
Time, the D.C. resistance of winding or insulation resistance；Rt1For temperature t during actual measurement1Time, the D.C. resistance of winding or insulation resistance；t2
It is 75 DEG C, t1For temperature during actual measurement；T is the temperature conversion factor of unlike material equipment, and the temperature conversion factor of copper material is
235, the temperature conversion factor of aluminium is 225；
Step 2: on the basis of described Excel form, carry out equation editing, arrange computing formula, by actual measurement over the years
Value converts, and obtains scaled value；
Step 3: utilize the function of Excel, generate the data and curves of scaled value over the years respectively；
Step 4: the relatively corresponding relation between the data and curves of scaled value over the years, searches the defect that described electrical equipment exists.
Test data tracing analysis relative method the most according to claim 1, it is characterised in that scaled value described in step 2
Refer to the scaled value when standard temperature 75 DEG C or 20 DEG C.
Test data tracing analysis relative method the most according to claim 1, it is characterised in that described
Following conversion relation is there is between scaled value and the actual measured value of the leakage current of transformator:
It2=It1×1.60.1(t2-t1), in formula: It2For being scaled to standard temperature t2Time leakage current values, unit is μ A；It1For
Temperature t during actual measurement1Time measurement leakage current values, unit is μ A；t2It is 75 DEG C, t1For temperature during actual measurement.
Test data tracing analysis relative method the most according to claim 1, it is characterised in that the medium of described transformator damages
Consume and between scaled value and the actual measured value of factor, there is following conversion relation:
tanδt2=tan δ t1×1.30.1(t1-t2), in formula: tan δ t2For being scaled to standard temperature t2Time dielectric dissipation factor,
tanδt1For temperature t during actual measurement1Time dielectric dissipation factor；t2It is 20 DEG C, t1For temperature during actual measurement.
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| CN106153179B (en) * | 2015-04-10 | 2019-12-27 | 华北电力大学（保定） | Vibration fault diagnosis method for medium-speed coal mill |
| CN107016481A (en) * | 2016-10-25 | 2017-08-04 | 大唐滨州发电有限公司 | Power plant excitation system and G-T protective definite value matching relationship nucleus correcting system |
| CN106408215A (en) * | 2016-10-28 | 2017-02-15 | 宁波天派智能科技有限公司 | Substation equipment running condition detection method and device |
| CN109523419A (en) * | 2018-10-19 | 2019-03-26 | 国家电网有限公司 | Aggregation of data management and diagnostic assay applied to converting station high voltage electrical test |
| CN110220683A (en) * | 2019-06-10 | 2019-09-10 | 西北工业大学 | Flight Vehicle Structure vibration test measurement data comparative analysis system |
| CN110308327A (en) * | 2019-08-09 | 2019-10-08 | 云南电网有限责任公司电力科学研究院 | A kind of DCR of Transformer variable quantity Threshold Analysis method based on mathematical statistics |
| CN112214892A (en) * | 2020-10-13 | 2021-01-12 | 天威保变（秦皇岛）变压器有限公司 | Method for calculating harmonic-contained load loss of converter transformer |
| CN113344530A (en) * | 2021-06-10 | 2021-09-03 | 夏果夫 | Method for rapidly manufacturing building construction support by using EXCEL |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101093469A (en) * | 2005-06-09 | 2007-12-26 | 李晓清 | Method for implementing strength calculation of discrete elements of pipes in high pressure in thermal power stations |
| CN102354329A (en) * | 2011-07-25 | 2012-02-15 | 广州科易光电技术有限公司 | Infrared database intelligent diagnosis management system for charged equipment |
-
2013
- 2013-10-12 CN CN201310475648.XA patent/CN103578041B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101093469A (en) * | 2005-06-09 | 2007-12-26 | 李晓清 | Method for implementing strength calculation of discrete elements of pipes in high pressure in thermal power stations |
| CN102354329A (en) * | 2011-07-25 | 2012-02-15 | 广州科易光电技术有限公司 | Infrared database intelligent diagnosis management system for charged equipment |
Non-Patent Citations (1)
| Title |
|---|
| 电气设备红外测温技术的实现;陈琳等;《电测与仪表》;20130430;第50卷(第568期);第64,67,68页 * |
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