CN104361243B - A kind of appraisal procedure of oil-immersed power transformer sink-efficiency - Google Patents
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Abstract
The invention discloses a kind of appraisal procedure of oil-immersed power transformer sink-efficiency, step includes：Calculate transformer to be assessed at the appointed time section average load loss；Average load loss is obtained into average total losses power plus nameplate open circuit loss；Calculate the average residual power of transformer to be assessed at the appointed time section；It is assumed that the sink-efficiency of transformer to be assessed, the average heat radiation power of the radiator of transformer to be assessed at the appointed time section is calculated；Energy-consuming balance relation of the average heat radiation power equal to average residual power is subtracted according to average total losses power, average total losses power is subtracted into average residual power and the anti-sink-efficiency for releasing transformer to be assessed is calculated divided by average heat radiation power.The present invention can realize that sink-efficiency is calculated and solve the problems, such as that transformer radiator efficiency is not enough to grasp the load capacity of transformer, it is adaptable to install the transformer of radiator, and can also provide basis to calculate that transformer top-oil temperature rises.
Description
Technical field
The present invention relates to the efficiency optimization technology of oil-immersed power transformer, and in particular to a kind of oil-immersed power transformer
The appraisal procedure of sink-efficiency.
Background technology
Transformer manufacturing factory is entered using factory-based calculation method to the loss of oil-immersed power transformer, oil temperature liter, winding temperature rise
Row is calculated, and according to result of calculation, the cooling system of certain capacity is configured, to meet the cooling requirement of oil-immersed power transformer.
But, the oil-immersed power transformer in power network, because of the influence of the factors such as contaminated and dust, is incited somebody to action after a period of time is run
Inevitably cause cooling system efficiency to decline, such as cleaned not in time or overhaul plan, oil-immersed type power may be made
The top-oil temperature of transformer appreciates and exceedes permissible value, influences the load-carrying ability of transformer, and power network card load may be caused to transport
OK, made troubles to power supply enterprise and social production, household electricity.
Therefore, the necessary efficiency to the cooling system of oil-immersed power transformer in operation makes assessment, and according to
Assessment result formulates effective Strategies of Maintenance, improves the utilization ratio of power transformer.However, transformer manufacturing factory is only
The cooling system calculated value that top-oil temperature rises under 100% cooling effectiveness is considered, to operating oil-immersed type power transformation
Device, up to the present, domestic few people propose the effective ways for transformer radiator efficiency evaluation.
The content of the invention
The technical problem to be solved in the present invention is：For the above mentioned problem of prior art, there is provided one kind assessment accuracy is high,
Can realize that sink-efficiency is calculated and solve the problems, such as that transformer radiator efficiency is not enough to grasp the load capacity of transformer,
Suitable for the transformer of radiator, and can also be dissipated to calculate that transformer top-oil temperature liter provides basic oil-immersed power transformer
The appraisal procedure of hot device efficiency.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of appraisal procedure of oil-immersed power transformer sink-efficiency, step includes：
1) the average load loss of transformer to be assessed at the appointed time section is calculated
2) average load is lostPlus the nameplate open circuit loss p of transformer to be assessed0, obtain transformation to be assessed
The average total losses power of device at the appointed time section
3) the average residual power of transformer to be assessed at the appointed time section is calculated
4) assume the sink-efficiency η of transformer to be assessed, transformer to be assessed is calculated according to the sink-efficiency η for assuming
Radiator at the appointed time section average heat radiation power
5) according to the average total losses powerSubtract average heat radiation powerEqual to average residual powerEnergy
Consumption equilibrium relation, according to the sink-efficiency η of formula (5) Extrapolation transformer to be assessed；
In formula (5), r represents the time span of specified time period, p0The nameplate open circuit loss of transformer to be assessed is represented,
Represent transformer to be assessed at the appointed time section average load loss,Represent transformer to be assessed at the appointed time section
Average residual power, △ TiRepresent the top-oil temperature liter for specifying the i moment in the time period, the effective area of dissipation of S indication transformers, a
With b indication transformers heating center and the correlation factor of radiating centre-height ratio.
Preferably, the step 1) in calculate the average load loss of transformer to be assessed at the appointed time sectionIt is detailed
Step includes：The coil-type of transformer to be assessed is judged, if transformer to be assessed is three-winding transformer, according to formula
(1) the average load loss of transformer to be assessed at the appointed time section is calculatedElse if transformer to be assessed is two coils
Transformer, then calculate the average load loss of transformer to be assessed at the appointed time section according to formula (2)
In formula (1), r represents the time span of specified time period, IhI () represents the running current of i moment high pressure windings, Ihe
Represent the rated current of high pressure winding, ImI () represents the running current of pressure winding in the i moment, ImeThe specified of winding is pressed in expression
Electric current, IlI () represents the running current of i moment low pressure windings, IleRepresent the rated current of low pressure winding, phmRepresent senior middle school's nameplate
Load loss, phlRepresent height nameplate load loss, pmlLow nameplate load loss in expression；N represent high pressure winding and low pressure around
Pool-size ratio；
In formula (2), r represents the time span of specified time period, IhI () represents the running current of i moment high pressure windings, Ihe
Represent the rated current of high pressure winding, phlRepresent height nameplate load loss.
Preferably, the step 3) the middle average residual power for calculating transformer to be assessedFunction expression such as formula
(3) shown in；
In formula (3), r represents the time span of specified time period, △ TrRepresent the top layer oil for specifying finish time time period
Temperature rise, △ T0The top-oil temperature liter for specifying time period initial time is represented, the specific heat capacity of c indication transformers oil, B represents experience system
Number, g indication transformers oil gross weight.
Preferably, the value of the empirical coefficient B is 0.8.
Preferably, the step 4) according to the sink-efficiency η for assuming calculate transformer to be assessed radiator it is flat
Equal heat radiation powerFunction expression such as formula (4) shown in；
In formula (4), η represents the sink-efficiency of transformer to be assessed, and r represents the time span of specified time period, △ Ti
Represent the top-oil temperature liter for specifying the i moment in the time period, the effective area of dissipation of S indication transformers, the heating of a and b indication transformers
Center and the correlation factor of radiating centre-height ratio.
The appraisal procedure tool of oil-immersed power transformer sink-efficiency of the present invention has the advantage that：
1st, the appraisal procedure of oil-immersed power transformer sink-efficiency of the present invention with transformer generate heat and radiating it is real-time
Balance is used as theoretical foundation, it is believed that within a relatively short time, the efficiency of its cooling system keeps not transformer substantially
Become, real-time total losses exist as thermal source, and the real-time cooling capacity of transformer cooling system should be equal with real-time total losses, that is, put down
Equal total losses powerSubtract average heat radiation powerEqual to average residual powerEnergy-consuming balance relation, averagely will always damage
Wasted work rateSubtract average residual powerAnd divided by average heat radiation powerThe sink-efficiency of calculating transformer.As one
Plant the top-oil temperature based on transformer and rise factory's computational methods, average load is lost in being run by calculating transformerAveragely
Dump powerBy Extrapolation thinking proposed by the present invention, the real-time of transformer cooling system dissipates in can realizing operation
Hot device efficiency calculation, can conveniently grasp the load capacity of transformer, can formulate effective Strategies of Maintenance, solve transformer
The not enough problem of sink-efficiency.
2nd, the appraisal procedure of oil-immersed power transformer sink-efficiency of the present invention sets with reference to the cooling of transformer to be assessed
Standby type carries out different calculating, can be applied to the transformer for installing radiator.
3rd, the present invention further obtain sink-efficiency on the basis of, additionally it is possible to for the transformer under arbitrary load
The calculating that top-oil temperature appreciates.
Brief description of the drawings
Fig. 1 is the basic procedure schematic diagram of present invention method.
Specific embodiment
As shown in figure 1, the step of appraisal procedure of the present embodiment oil-immersed power transformer sink-efficiency includes：
1) the average load loss of transformer to be assessed at the appointed time section is calculatedStarted with 0 moment in the present embodiment
The time period terminated to the r moment is used as the specified time period.
2) average load is lostPlus the nameplate open circuit loss p of transformer to be assessed0, obtain transformation to be assessed
The average total losses power of device at the appointed time section(i.e.)；
3) the average residual power of transformer to be assessed at the appointed time section is calculated
4) assume the sink-efficiency η of transformer to be assessed, transformer to be assessed is calculated according to the sink-efficiency η for assuming
Radiator at the appointed time section average heat radiation power
5) according to the average total losses powerSubtract average heat radiation powerEqual to average residual powerEnergy
Consumption equilibrium relation, by average total losses powerSubtract average residual powerAnd divided by average heat radiation powerExtrapolation
The sink-efficiency η of transformer to be assessed.
In the present embodiment, the step 1) in calculate the average load loss of transformer to be assessed at the appointed time section's
Detailed step includes：The coil-type of transformer to be assessed is judged, if transformer to be assessed is three-winding transformer, basis
Formula (1) calculates the average load loss of transformer to be assessed at the appointed time sectionElse if transformer to be assessed is two lines
Coil transformer, then calculate the average load loss of transformer to be assessed at the appointed time section according to formula (2)
In formula (1), r represents the time span of specified time period, IhI () represents the running current of i moment high pressure windings, Ihe
Represent the rated current of high pressure winding, ImI () represents the running current of pressure winding in the i moment, ImeThe specified of winding is pressed in expression
Electric current, IlI () represents the running current of i moment low pressure windings, IleRepresent the rated current of low pressure winding, phmRepresent senior middle school's nameplate
Load loss, phlRepresent height nameplate load loss, pmlLow nameplate load loss in expression；N represent high pressure winding and low pressure around
Pool-size ratio.The present embodiment is big by each winding real-time current by each winding of transformer load loss reduction to transformer
It is small come calculate real time load loss pkSuch that it is able to allow result of calculation truly to reflect the Real time Efficiency of cooling system.
In formula (2), r represents the time span of specified time period, IhI () represents the running current of i moment high pressure windings, Ihe
Represent the rated current of high pressure winding, phlRepresent height nameplate load loss.
The present embodiment is installed for the sink-efficiency η for being calculated transformer to be assessed as cooling device using radiator
The transformer of radiator is generally two kinds of radiating modes of oil (ONAN) and oil (ONAF).
In the present embodiment, the step 3) the middle average residual power for calculating transformer to be assessedFunction expression
As shown in formula (3)；
In formula (3), r represents the time span of specified time period, △ TrRepresent the top layer oil for specifying finish time time period
Temperature rise, △ T0The top-oil temperature liter for specifying time period initial time is represented, the specific heat capacity of c indication transformers oil, B represents experience system
Number, g indication transformers oil gross weight.Average residual power shown in formula (3)Function expression by transformer oil thermal capacitance meter
The derivation of equation is calculated, the average residual power of transformer to be assessed can be calculated according to the temperature change of transformer oilIn the present embodiment, the value of empirical coefficient B is 0.8.
In the present embodiment, the step 4) in the radiator of transformer to be assessed is calculated according to the sink-efficiency η for assuming
Average heat radiation powerFunction expression such as formula (4) shown in；
In formula (4), η represents the sink-efficiency of transformer to be assessed, and r represents the time span of specified time period, △ Ti
Represent the top-oil temperature liter for specifying the i moment in the time period, the effective area of dissipation of S indication transformers, the heating of a and b indication transformers
Center and the correlation factor of radiating centre-height ratio.Average heat radiation power shown in formula (4)Function expression by transformation
Device top-oil temperature rises factory's anti-sink-efficiency and transformer to be assessed inquired into, embody transformer to be assessed of computing formula
Radiator average heat radiation powerBetween functional relation.
In the present embodiment, the relation such as table 1 of transformer heating center and radiating centre-height ratio k and correlation factor a, b
It is shown.
Table 1：Transformer heating center and radiating centre-height ratio k and the relation table of correlation factor a, b.
In the present embodiment, the step 5) in calculate transformer to be assessed sink-efficiency η function expression such as formula
(5) shown in；
In formula (5), r represents the time span of specified time period, p0The nameplate open circuit loss of transformer to be assessed is represented,
Represent transformer to be assessed at the appointed time section average load loss,Represent the flat of transformer to be assessed at the appointed time section
Equal dump power, △ TiRepresent the top-oil temperature liter for specifying the i moment in the time period, the effective area of dissipation of S indication transformers, a and b
Indication transformer heating center and the correlation factor of radiating centre-height ratio.For transformer to be assessed, arrived at 0 moment
In the specified time period at r moment,I.e.The function expression of sink-efficiency η shown in the formula of drawing (5) can be shifted onto according to convolution (4).
By taking the #1 main transformers of 220kV north lake as an example, the nameplate parameter of 220kV north lake #1 main transformers is as shown in table 2；220kV north lake #1
The radiator information of main transformer is as shown in table 3；Heating power and heat radiation power when 220kV north lake #1 main transformers run is as shown in table 4.
Table 2：The nameplate parameter list of 220kV north lake #1.
Table 3：The radiator information table of 220kV north lake #1 main transformers.
| Sequence number | Effective area of dissipation | Heating center and radiating centre-height ratio | Efficiency |
| 1 | 1350 | 0.7 | 84.00% |
Table 4：Heating power and heat radiation power when 220kV north lake #1 main transformers run.
As known from Table 4, it is 185.9kW that northern lake #1 main transformers specify the average total losses power in time interval (24 hours),
Average heat radiation power is 215kW.The oily gross weight of northern lake #1 main transformers is 45.4 tons, and it is 3.7K to rise difference with top-oil temperature when 0 when 24,
Coefficient B is incorporated experience into for 0.8, it is 24 to specify time interval, the specific heat capacity c of transformer oil is 1920, then where in 24 hours
Average residual power isTherefore, the main transformer radiator
Sink-efficiency be η=(185.9-5.23)/215=84.0%.
Certainly, it is to be assessed by calculating on the basis of the sink-efficiency η for having solved transformer to be assessed
The average total losses power of transformerCalculate the average residual power of transformer to be assessed at the appointed time sectionTransformer to be assessed can also in turn be solved in the specified time period at 0 moment to r moment based on formula (4) and (5)
Top-oil temperature rise △ T.Under this sink-efficiency η=84.0%, when height-middle winding oepration at full load, counter can release
The top-oil temperature of northern lake #1 main transformers is upgraded to 58K.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications
Should be regarded as protection scope of the present invention.
Claims (5)
1. a kind of appraisal procedure of oil-immersed power transformer sink-efficiency, it is characterised in that step includes：
1) the average load loss of transformer to be assessed at the appointed time section is calculated
2) average load is lostPlus the nameplate open circuit loss p of transformer to be assessed0, obtain transformer to be assessed and exist
Specify the average total losses power of time period
3) the average residual power of transformer to be assessed at the appointed time section is calculated
4) assume the sink-efficiency η of transformer to be assessed, dissipating for transformer to be assessed is calculated according to the sink-efficiency η for assuming
The average heat radiation power of hot device at the appointed time section
5) according to the average total losses powerSubtract average heat radiation powerEqual to average residual powerEnergy-consuming balance
Relation, according to the sink-efficiency η of formula (5) Extrapolation transformer to be assessed；
In formula (5), r represents the time span of specified time period, p0The nameplate open circuit loss of transformer to be assessed is represented,Represent
Transformer to be assessed at the appointed time section average load loss,Represent the average of transformer to be assessed at the appointed time section
Dump power, Δ TiRepresent the top-oil temperature liter for specifying the i moment in the time period, the effective area of dissipation of S indication transformers, a and b tables
Show the correlation factor at transformer heating center and radiating centre-height ratio.
2. the appraisal procedure of oil-immersed power transformer sink-efficiency according to claim 1, it is characterised in that described
Step 1) in calculate the average load loss of transformer to be assessed at the appointed time sectionDetailed step include：Judge to be assessed
The coil-type of transformer, if transformer to be assessed is three-winding transformer, calculates transformer to be assessed and exists according to formula (1)
Specify the average load loss of time periodElse if transformer to be assessed is two coil transformers, then calculated according to formula (2)
Transformer to be assessed at the appointed time section average load loss
In formula (1), r represents the time span of specified time period, IhI () represents the running current of i moment high pressure windings, IheRepresent
The rated current of high pressure winding, ImI () represents the running current of pressure winding in the i moment, ImeThe rated current of winding is pressed in expression,
IlI () represents the running current of i moment low pressure windings, IleRepresent the rated current of low pressure winding, phmRepresent senior middle school's nameplate load
Loss, phlRepresent height nameplate load loss, pmlLow nameplate load loss in expression；N represents that high pressure winding holds with low pressure winding
Amount ratio；
In formula (2), r represents the time span of specified time period, IhI () represents the running current of i moment high pressure windings, IheRepresent
The rated current of high pressure winding, phlRepresent height nameplate load loss.
3. the appraisal procedure of oil-immersed power transformer sink-efficiency according to claim 2, it is characterised in that：It is described
Step 3) the middle average residual power for calculating transformer to be assessedFunction expression such as formula (3) shown in；
In formula (3), r represents the time span of specified time period, Δ TrThe top-oil temperature liter for specifying finish time time period is represented,
ΔT0The top-oil temperature liter for specifying time period initial time is represented, the specific heat capacity of c indication transformers oil, B represents empirical coefficient, g
Indication transformer oil gross weight.
4. the appraisal procedure of oil-immersed power transformer sink-efficiency according to claim 3, it is characterised in that：It is described
The value of empirical coefficient B is 0.8.
5. the appraisal procedure of oil-immersed power transformer sink-efficiency according to claim 4, it is characterised in that：It is described
Step 4) in calculated according to the sink-efficiency η for assuming transformer to be assessed radiator average heat radiation powerFunction table
Up to formula such as formula (4) Suo Shi；
In formula (4), η represents the sink-efficiency of transformer to be assessed, and r represents the time span of specified time period, Δ TiExpression refers to
The top-oil temperature liter at i moment in section of fixing time, the effective area of dissipation of S indication transformers, a and b indication transformers heating center with
The correlation factor of radiating centre-height ratio.
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| CN108917981B (en) * | 2018-06-20 | 2020-03-24 | 国网天津市电力公司电力科学研究院 | Non-invasive winding temperature measurement method for oil-immersed self-cooling cake type winding transformer |
| CN108956184B (en) * | 2018-09-17 | 2020-09-25 | 云南电网有限责任公司电力科学研究院 | Method and device for quantitatively measuring heat dissipation efficiency of transformer strong oil air-cooled cooler |
| CN109596883A (en) * | 2018-11-24 | 2019-04-09 | 苏州驿力机车科技股份有限公司 | A kind of detection system and detection method of automobile radiators heat radiation power |
| CN112487343B (en) * | 2020-12-01 | 2022-04-19 | 广东电网有限责任公司佛山供电局 | Method for calculating working efficiency of cooling system of split oil-immersed transformer |
| CN112595745B (en) * | 2020-12-02 | 2021-09-24 | 西南交通大学 | Heat dissipation characteristic evaluation method for dry-type vehicle-mounted traction transformer |
| CN113946170B (en) * | 2021-10-14 | 2022-11-04 | 云南电网有限责任公司电力科学研究院 | Self-adaptive control method and system of transformer cooling device |
| CN117556618B (en) * | 2023-11-20 | 2024-07-12 | 西南交通大学 | Evaluation method for heat dissipation efficiency of dry type power transformer fan |
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