CN106771620A - A kind of DC resistance of power transformer comprehensive test analysis device - Google Patents
A kind of DC resistance of power transformer comprehensive test analysis device Download PDFInfo
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- CN106771620A CN106771620A CN201611239242.1A CN201611239242A CN106771620A CN 106771620 A CN106771620 A CN 106771620A CN 201611239242 A CN201611239242 A CN 201611239242A CN 106771620 A CN106771620 A CN 106771620A
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- resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The invention discloses a kind of DC resistance of power transformer comprehensive test analysis device, direct current resistance m easurem ent device including the resistance data for obtaining transformer, also include command memory, the processor for processing the work order, the data storage for storing the overhaul data obtained according to work order and the display screen for showing the overhaul data for storing work order, wherein, the work order includes：D.C. resistance real time temperature obtains instruction, the D.C. resistance real time temperature for obtaining the transformer；The alternate resistance error of transformer obtains instruction, the error amount of the alternate resistance for obtaining the transformer；Phase resistance obtains instruction, the phase resistance for obtaining the transformer.It can be seen that, the present invention carries out in-situ processing to transformer resistance and shows, tester's personnel can at the scene obtain overhaul data, and transformer is accordingly safeguarded, significantly improves the work on the spot efficiency to DC resistance of power transformer test.
Description
Technical field
The present invention relates to electric transformer resistance technical field of measurement and test, more particularly to a kind of DC resistance of power transformer is comprehensive
Close device for testing and analyzing.
Background technology
Power transformer is the capital equipment of power system, and its safe operation is significant to power system.Make
For one of the important test event of power transformer winding D.C. resistance is tested, it can be found that Transformer Winding welding quality, tap
Whether switch contact good, layer, turn-to-turn whether the defect such as short circuit.Based on the above, the instrument for measuring DC resistance of onsite application
Must possess service behaviour higher, such as accuracy, rapidity etc..Current instrument for measuring DC resistance, in accuracy, quickly
Property etc. aspect can meet field requirement, but often unitary function, it is impossible to the data that test is obtained are automatically analyzed,
Measure after corresponding data, it is necessary to dependence test personnel are calculated or calculated by other arithmetic facilities, serious shadow by artificial
Ring work on the spot efficiency.In actual test, dependence test personnel have found transformer after other arithmetic facilities calculate analysis
There are potential faults, the scene of returning is safeguarded, inefficiency, meanwhile, there is also transformer and safeguard causing trouble not in time
The possibility of generation.
To sum up shown, how to improve to the work on the spot efficiency of DC resistance of power transformer test is people in the art
The current technical issues that need to address of member.
The content of the invention
In view of this, it is an object of the invention to provide a kind of DC resistance of power transformer comprehensive test analysis device,
The work on the spot efficiency to DC resistance of power transformer test can be significantly improved.Its concrete scheme is as follows：
A kind of DC resistance of power transformer comprehensive test analysis device, including for obtaining the resistance data of transformer
Direct current resistance m easurem ent device, treatment also including the command memory for storing work order, for processing the work order
Device, the data storage for storing the overhaul data obtained according to work order and the display for showing the overhaul data
Screen, wherein, the work order includes：
D.C. resistance real time temperature obtains instruction, the D.C. resistance real time temperature for obtaining the transformer；
The alternate resistance error of transformer obtains instruction, the error amount of the alternate resistance for obtaining the transformer；
Phase resistance obtains instruction, the phase resistance for obtaining the transformer.
Preferably, the D.C. resistance real time temperature obtains instruction and includes：
Obtain the real time temperature of the winding of the transformer；
According to the real time temperature and the winding coefficient of the transformer, it is calculated by the first preset formula described straight
Leakage resistance real time temperature, wherein, first preset formula is
In formula, t0On the basis of temperature, t is real time temperature, R0It is t0When DC resistance, RtD.C. resistance during for t
Value, T is that (copper conductor is 234.5 to winding coefficient, and 225) aluminum conductor is.
Preferably, the alternate resistance error of the transformer obtains instruction and includes：
Obtain the actual measurement resistance maximum and actual measurement resistance minimum value of the transformer；
Obtain the three-phase average value of the transformer, wherein the three-phase average value be each alternate resistance of the transformer it
The average value of sum；
The difference and the ratio of three-phase average value of the actual measurement resistance maximum and the actual measurement resistance minimum value are calculated, is obtained
The alternate resistance error of the transformer.
Preferably, the work order also includes：
Whether error calculation is instructed, for judging the alternate resistance error of the transformer more than or equal to preset value；
First maintenance result idsplay order, for being judged to it is then to control the display screen when error calculation instruction
Show that the transformer has the exceeded information of error, when error calculation instruction is judged to no, then control the display screen
Show the transformer in the absence of the exceeded information of error.
Preferably, the work order also includes：
Alarming value decision instruction, for judging that the alternate resistance error of the transformer is not more than when error calculation instruction
Whether the preset value, then judge the winding resistance value of the transformer more than or equal to alarming value；
Second maintenance result idsplay order, for being judged to it is then to control the display when the alarming value decision instruction
There is the excessive information of change in resistance in the screen display transformer, when the alarming value decision instruction is judged to no, then control institute
Stating display screen shows the transformer in the absence of the excessive information of change in resistance.
Preferably, the work order also includes：
Error rate obtains instruction, the alternate resistance error of transformer and the data storage for obtaining this acquisition
The error rate of the alternate resistance error of previous transformer stored in device.
Preferably, the phase resistance obtains instruction and includes：
Obtain the connection type of the transformer coil；
When transformer coil is triangle joint, the alternate resistance of the transformer is obtained；
According to the alternate resistance, the phase resistance of the transformer is calculated by the second preset formula, wherein, it is described
Second preset formula is
In formula,RaIt is the phase resistance of the A phases of the transformer, RbIt is the B of the transformer
The phase resistance of phase, RcIt is the phase resistance of the C phases of the transformer, RabIt is the resistance between the transformer A phases and B phases, RacFor
Resistance between the A phases and C phases of the transformer, RbcIt is the resistance between the B phases and C phases of the transformer.
It can be seen that, a kind of DC resistance of power transformer comprehensive test analysis device disclosed by the invention is getting transformation
After device resistance data, data processing is carried out by corresponding work order, and shown by display screen so that tester
The overhaul data of transformer can be quickly obtained at the scene, and transformer is accordingly safeguarded according to the overhaul data, significantly
Improve the work on the spot efficiency to DC resistance of power transformer test.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 shows for a kind of structure of DC resistance of power transformer comprehensive test analysis device disclosed in the embodiment of the present invention
It is intended to.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The embodiment of the invention discloses a kind of DC resistance of power transformer comprehensive test analysis device, including for obtaining
The direct current resistance m easurem ent device 11 of the resistance data of transformer, also including the command memory 12 for storing work order 121, uses
Processor 13 in the above-mentioned work order for the treatment of, the data storage 14 for storing the overhaul data obtained according to work order
With the display screen 15 for showing above-mentioned overhaul data, wherein, above-mentioned work order includes：D.C. resistance real time temperature is obtained and referred to
1211 are made, the D.C. resistance real time temperature for obtaining above-mentioned transformer；The alternate resistance error of transformer obtains instruction 1212, uses
In the error amount of the alternate resistance for obtaining above-mentioned transformer；Phase resistance obtains instruction 1213, the phase for obtaining above-mentioned transformer
Resistance.
In a kind of specific embodiment, above-mentioned D.C. resistance real time temperature obtains instruction to be included：Obtain above-mentioned transformation
The real time temperature of the winding of device；According to above-mentioned real time temperature and the winding coefficient of above-mentioned transformer, by the first preset formula meter
Calculation obtains above-mentioned D.C. resistance real time temperature, wherein, above-mentioned first preset formula is
In formula, t0On the basis of temperature, t is real time temperature, R0It is t0When DC resistance, RtD.C. resistance during for t
Value, T is winding coefficient, and the winding coefficient of copper conductor is 234.5, and the winding coefficient of aluminum conductor is 225, corresponding electricity herein
Resistance unit is ohm (Ω).
It is understood that because the voltage and current of transformer work is very big, for example, the transformer of 1600kVA is
The low-voltage distribution system power supply of 380V, the then line current that can be carried is 2310A, therefore obtains the real time temperature of the winding of transformer
The non-contact temperature sensor such as infrared temperature sensor can be used, naturally it is also possible to by measuring transformer skin temperature come
Obtain the temperature of corresponding transformer.
In another specific embodiment, the alternate resistance error of above-mentioned transformer obtains instruction to be included：Obtain above-mentioned
The actual measurement resistance maximum and actual measurement resistance minimum value of transformer；The three-phase average value of above-mentioned transformer is obtained, wherein above-mentioned three
Equal average is the average value of each alternate resistance sum of above-mentioned transformer；Above-mentioned actual measurement resistance maximum is calculated with above-mentioned actual measurement electricity
The difference of minimum value and the ratio of three-phase average value are hindered, the alternate resistance error of above-mentioned transformer is obtained.
It is understood that transformer is provided with three-phase line, therefore the alternate resistance error of transformer includes the A phases of transformer
And the resistance between B phases, A phases and B phases, B phases and C phases, it is indicated here by corresponding symbol, RabIt is transformer A phases and B
Resistance between phase, RacIt is the resistance between the A phases and C phases of transformer, RbcIt is the resistance between the B phases and C phases of transformer.
The alternate resistance error of transformer is
Wherein,ΔR1- error percentage, RmaxIt is the maximum in actual measurement, RminIt is reality
Minimum value in survey,It is the average value surveyed in three-phase.
It is understood that Rab、RacAnd RbcThere is actual measurement maximum and actual measurement minimum value in actual test, therefore,
The alternate resistance error of transformer also includes three grouping errors between A phases and B phases, between A phases and C phases, between B phases and C phases.
Additionally, the resistance between each coil of Transformer Winding there is also actual measurement maximum and actual measurement minimum value, therefore, ask for
The computational methods error approach alternate with above-mentioned calculating of resistance error is identical between corresponding line, will not be repeated here.
Can be straight to power transformer disclosed by the invention according to the above-mentioned embodiment for asking for the alternate resistance error of transformer
Leakage resistance comprehensive test analysis device is further optimized, wherein, work order also includes：Error calculation is instructed, for sentencing
Whether the alternate resistance error of above-mentioned transformer that breaks is more than or equal to preset value；First maintenance result idsplay order, for when above-mentioned
Error calculation instruction is judged to it is then to control above-mentioned display screen to show that above-mentioned transformer has the exceeded information of error, when above-mentioned
Error calculation instruction is judged to no, then control above-mentioned display screen show that above-mentioned transformer does not exist the exceeded information of error.
It should be noted that according to the transformer of different size, preset value takes different numerical value, two classes are specifically divided into：
(1) transformer of more than 1600kVA, the error that the DC resistance of each phase coil is mutual not should be greater than three-phase average value
2%, error not should be greater than the 1% of three-phase average value between line.(2) transformer of below 1600kVA, the D.C. resistance of each phase coil
The mutual error of value not should be greater than error between the 4% of three-phase average value, line and not should be greater than the 2% of three-phase average value.
Transformer for more than 1600kVA, any group between A phases and B phases, between A phases and C phases, between B phases and C phases
Error more than or equal to the 2% of three-phase average value, or between the line of each coil of Transformer Winding error more than or equal to three equal
The 1% of average, then in the relevant position of display screen there is the exceeded information of error in display, the information specifically can by word or
Picture is shown.When error is not less than preset value, then display does not exist the exceeded letter of error in the relevant position of display screen
Breath, the information can specifically be shown by word or picture.
Transformer for below 1600kVA, any group between A phases and B phases, between A phases and C phases, between B phases and C phases
Error more than or equal to the 4% of three-phase average value, or between the line of each coil of Transformer Winding error more than or equal to three equal
The 2% of average, then in the relevant position of display screen there is the exceeded information of error in display, the information specifically can by word or
Picture is shown.When error is not less than preset value, then display does not exist the exceeded letter of error in the relevant position of display screen
Breath, the information can specifically be shown by word or picture.
Above-mentioned error in judgement whether more than or equal to preset value embodiment in, exist error although meet code will
Ask, but the corresponding resistance data variation amplitude of transformer is larger, should now cause concern, it is therefore desirable to set an alarm
Value.
In order to realize the judgement of winding resistance value and alarming value size to transformer, work order also includes：Alarming value is sentenced
Fixed instruction, for judging that the alternate resistance error of above-mentioned transformer is not more than above-mentioned preset value when the instruction of above-mentioned error calculation, then sentences
Whether the winding resistance value of disconnected above-mentioned transformer is more than or equal to alarming value；Second maintenance result idsplay order, for when above-mentioned report
Alert value decision instruction is judged to it is then to control above-mentioned display screen to show that above-mentioned transformer has the excessive information of change in resistance, when
Above-mentioned alarming value decision instruction be judged to it is no, then control above-mentioned display screen show above-mentioned transformer in the absence of change in resistance it is excessive
Information.
Here, alarming value is chosen for 60 the percent of the corresponding norm standard value of each phase data, with 1600kVA transformers
As a example by：Criterion is
L≤0.01, l≤0.006；
P≤0.02, p≤0.012；
K is no more than 0.012 no more than 0.02, k；
Wherein, L is line resistance norm standard, and l is that line resistance warns standard, and P is line resistance norm standard, and p is line electricity
Resistance warning standard, K is longitudinal comparison norm standard, and k is that longitudinal comparison warns standard.
A kind of DC resistance of power transformer comprehensive test analysis device disclosed by the invention also supports the alternate resistance of transformer
Value error longitudinal direction contrast, will this obtain the alternate resistance error of transformer resistance alternate with the preceding transformer for once obtaining
Error is contrasted, to obtain error rate.
In order to obtain error rate, work order also includes：Error rate obtains instruction, for obtaining this acquisition
The alternate resistance error of transformer and the alternate resistance error of previous transformer stored in above-mentioned data storage error
Rate of change.
Under normal circumstances, compared with last time measured value, its change not should be greater than last time measured value to this measured value yet
2%：
ΔR2=(R-RI)/RI
Wherein, Δ R2It is error percentage, R is this measured value, RIIt is the previous measurement stored in data storage
Value.
It is understood that transformer is provided with three-phase line, therefore the alternate resistance error of transformer includes the A phases of transformer
And the resistance between B phases, A phases and B phases, B phases and C phases, 3 groups of data altogether, corresponding error rate there is also corresponding three
Group.
In yet a further specific embodiment, above-mentioned phase resistance obtains instruction to be included：Obtain the company of above-mentioned transformer coil
Connect type；When transformer coil is triangle joint, the alternate resistance of above-mentioned transformer is obtained；According to above-mentioned alternate resistance, lead to
The phase resistance that the second preset formula is calculated above-mentioned transformer is crossed, wherein, above-mentioned second preset formula is
In formula,RaIt is the phase resistance of the A phases of above-mentioned transformer, RbIt is the B of above-mentioned transformer
The phase resistance of phase, RcIt is the phase resistance of the C phases of above-mentioned transformer, RabIt is the resistance between above-mentioned transformer A phases and B phases, RacFor
Resistance between the A phases and C phases of above-mentioned transformer, RbcIt is the resistance between the B phases and C phases of above-mentioned transformer.If three is equal
Weighing apparatus, phase resistance is equal to 1.5 times of line resistances.
Finally, in addition it is also necessary to explanation, herein, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between there is any this actual relation or order.And, term " including ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, article or equipment including a series of key elements not only include that
A little key elements, but also other key elements including being not expressly set out, or also include for this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", does not arrange
Except also there is other identical element in the process including the key element, method, article or equipment.
A kind of DC resistance of power transformer comprehensive test analysis device provided by the present invention has been carried out in detail above
Introduce, specific case used herein is set forth to principle of the invention and implementation method, the explanation of above example
It is only intended to help and understands the method for the present invention and its core concept；Simultaneously for those of ordinary skill in the art, according to this
The thought of invention, be will change in specific embodiments and applications, and in sum, this specification content should not
It is interpreted as limitation of the present invention.
Claims (7)
1. a kind of DC resistance of power transformer comprehensive test analysis device, including for obtain transformer resistance data it is straight
Leakage resistance measuring appliance, it is characterised in that also including the command memory for storing work order, for processing the work refer to
The processor of order, for store according to work order obtain overhaul data data storage and for showing the maintenance number
According to display screen, wherein, the work order includes：
D.C. resistance real time temperature obtains instruction, the D.C. resistance real time temperature for obtaining the transformer；
The alternate resistance error of transformer obtains instruction, the error amount of the alternate resistance for obtaining the transformer；
Phase resistance obtains instruction, the phase resistance for obtaining the transformer.
2. DC resistance of power transformer comprehensive test analysis device according to claim 1, it is characterised in that described straight
Leakage resistance real time temperature obtains instruction to be included：
Obtain the real time temperature of the winding of the transformer；
According to the real time temperature and the winding coefficient of the transformer, the direct current is calculated by the first preset formula
Resistance real time temperature, wherein, first preset formula is
In formula, t0On the basis of temperature, t is real time temperature, R0It is t0When DC resistance, RtDC resistance during for t, T is
Winding coefficient.
3. DC resistance of power transformer comprehensive test analysis device according to claim 1, it is characterised in that the change
The alternate resistance error of depressor obtains instruction to be included：
Obtain the actual measurement resistance maximum and actual measurement resistance minimum value of the transformer；
The three-phase average value of the transformer is obtained, wherein the three-phase average value is each alternate resistance sum of the transformer
Average value；
The difference and the ratio of three-phase average value of the actual measurement resistance maximum and the actual measurement resistance minimum value are calculated, obtains described
The alternate resistance error of transformer.
4. DC resistance of power transformer comprehensive test analysis device according to claim 3, it is characterised in that the work
Instructing also includes：
Whether error calculation is instructed, for judging the alternate resistance error of the transformer more than or equal to preset value；
First maintenance result idsplay order, for being judged to it is then to control the display screen to show when error calculation instruction
There is the exceeded information of error in the transformer, when error calculation instruction is judged to no, then control the display screen to show
The transformer is in the absence of the exceeded information of error.
5. DC resistance of power transformer comprehensive test analysis device according to claim 4, it is characterised in that the work
Instructing also includes：
Alarming value decision instruction, described in being not more than when the alternate resistance error of the error calculation instruction judgement transformer
Whether preset value, then judge the winding resistance value of the transformer more than or equal to alarming value；
Second maintenance result idsplay order, for being judged to it is then to control the display screen display when the alarming value decision instruction
Show that the transformer has the excessive information of change in resistance, when the alarming value decision instruction is judged to no, then control described aobvious
Display screen shows the transformer in the absence of the excessive information of change in resistance.
6. DC resistance of power transformer comprehensive test analysis device according to claim 3, it is characterised in that the work
Instructing also includes：
Error rate obtains instruction, in the alternate resistance error of transformer and the data storage that obtain this acquisition
The error rate of the alternate resistance error of previous transformer of storage.
7. DC resistance of power transformer comprehensive test analysis device according to claim 1, it is characterised in that the phase
Resistance obtains instruction to be included：
Obtain the connection type of the transformer coil；
When transformer coil is triangle joint, the alternate resistance of the transformer is obtained；
According to the alternate resistance, the phase resistance of the transformer is calculated by the second preset formula, wherein, described second
Preset formula is
In formula,RaIt is the phase resistance of the A phases of the transformer, RbIt is the B phases of the transformer
Phase resistance, RcIt is the phase resistance of the C phases of the transformer, RabIt is the resistance between the transformer A phases and B phases, RacFor described
Resistance between the A phases and C phases of transformer, RbcIt is the resistance between the B phases and C phases of the transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611239242.1A CN106771620A (en) | 2016-12-28 | 2016-12-28 | A kind of DC resistance of power transformer comprehensive test analysis device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611239242.1A CN106771620A (en) | 2016-12-28 | 2016-12-28 | A kind of DC resistance of power transformer comprehensive test analysis device |
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| Publication Number | Publication Date |
|---|---|
| CN106771620A true CN106771620A (en) | 2017-05-31 |
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ID=58923190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611239242.1A Pending CN106771620A (en) | 2016-12-28 | 2016-12-28 | A kind of DC resistance of power transformer comprehensive test analysis device |
Country Status (1)
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| CN (1) | CN106771620A (en) |
Cited By (3)
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| CN112198459A (en) * | 2020-08-24 | 2021-01-08 | 国网河南省电力公司新乡供电公司 | Transformer winding fault comprehensive analysis method |
| CN113326191A (en) * | 2021-05-27 | 2021-08-31 | 合肥移瑞通信技术有限公司 | Current consumption testing method and device and storage medium |
| CN116027111A (en) * | 2023-03-28 | 2023-04-28 | 华北电力大学（保定） | Transformer electric variable measuring device and measuring method |
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Application publication date: 20170531 |