CN106249044B - A kind of transformer replacement saving unilateral measurement method of quantity of electricity based on root mean square - Google Patents
A kind of transformer replacement saving unilateral measurement method of quantity of electricity based on root mean square Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
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Abstract
The invention discloses a kind of, and the unilateral measurement method of quantity of electricity is saved in the transformer replacement based on root mean square, comprising the following steps: 1, determining energy conservation replacement item boundaries, project base period, statistical report phase and representative calculating time；2, the dedicated meter of voltage transformer, current transformer and settable parameter and calculated savings quantity of electricity is installed in transformer side；3, before the transformer replacement project implementation, the parameters such as transformer current voltage, no-load loss, load loss, rated capacity, maximum load power in representative calculating time in base period are measured；4, transformer current voltage, no-load loss, load loss, rated capacity, maximum load power parameter in representative calculating time statistical report phase are measured；5, persistently calculating rms voltage influences coefficient, rms current influence coefficient；6, calculated savings quantity of electricity.The present invention has many advantages, such as to simplify measurement procedure, saved measurement cost and measurement result is accurate.
Description
Technical field
The present invention relates to transformer quantity measuring methods, and in particular to a kind of transformer replacement saving electricity based on root mean square
The unilateral measurement method of power electricity, the measurement method belong to transformer field of measuring techniques.
Background technique
In the power system, distribution transformer is as the capital equipment for undertaking voltage, electric current and power conversion, quantity ten
It is point huge, and in rising year by year trend.Although the loss of every transformer is smaller, due to its huge radix and long-time
It is in operating status, so total losses caused by distribution transformer is annual are very surprising.Meanwhile some areas still use model
Older transformer, loss are apparently higher than novel transformer, therefore, whole to improve power grid by replacement new distribution transformer
Physical efficiency effect is horizontal, reduces energy loss becomes inevitable choice.And in order to orderly, reasonable progress transformer replacement, analysis
The economic benefit of replacement project, while the planning and designing for instructing power transformer to replace, need to replace transformer the section of front and back
About electricity is measured, is calculated.
The measurement that quantity of electricity is saved in transformer replacement there is no unified reference standard at present.Application publication number is
The Chinese invention patent application of CN103018584A discloses a kind of measurement that electric power and electricity are saved for electric power boosting and transformation
With verification method, the patent of invention is by installing metering device, the operation ginseng of measuring transformer transformation front and back in transformer two sides
Number, calculated savings quantity of electricity.Application publication number is that the Chinese invention patent application of CN104698269A discloses a kind of transformation
Quantity of electricity measuring and calculating device and measuring method are saved in device transformation front and back, and the patent of invention is by installing measurement dress in transformer unilateral side
It sets, forward backward averaging electric current, voltage is replaced come calculated savings quantity of electricity by calculating transformer.
Due to generally using single-ended measurement method in power grid, the method measured using both ends is needed to install in the other side and be surveyed
Device is measured, high to measurement accuracy requirement since the measurement error of both ends measuring device can be superimposed, the practicability is poor.It uses
The method of single-ended measurement is conducive to simplify measurement procedure, saves measurement cost.But it while using single-ended measurement method, need to examine
The accuracy for considering result calculates quantity of electricity using the parameter based on average value, in transformer from the angle analysis of Energy Equivalent
It may cause large error when peak-valley difference is larger, be not suitable for the energy conservation for needing accurate amount of energy saving assessed value as clearing foundation
Transformation project.
Summary of the invention
The purpose of the present invention is to overcome the shortcomings of the existing technology with it is insufficient, propose a kind of transformer based on root mean square more
It changes and saves the unilateral measurement method of quantity of electricity, which only needs to install metering device in transformer side can be real
It is existing.
The purpose of the present invention is achieved through the following technical solutions: a kind of transformer replacement saving electric power electricity based on root mean square
Measure unilateral measurement method, comprising the following steps:
S1. energy conservation replacement item boundaries, project base period, statistical report phase and T representative calculating time are determined；
S2. voltage transformer, current transformer and settable parameter and calculated savings electricity only are installed in transformer side
The dedicated meter of power electricity；
S3. before the transformer replacement project implementation, transformer current voltage, no-load loss in representative calculating time in base period are measured
P0, load loss Pk, rated capacity SN, maximum load power SIMEtc. parameters；
S4. after the transformer replacement project implementation, transformer current voltage, sky in representative calculating time statistical report phase are measured
Load-loss P '0, load loss P 'k, rated capacity S 'N, maximum load power S 'IMEtc. parameters；
S5. dedicated meter, which starts, continues computing module, and calculating rms voltage according to measurement the data obtained influences COEFFICIENT Ku
And rms current influences COEFFICIENT Ki；
Calculating rms voltage influences COEFFICIENT Ku:
Wherein, u is the transformer voltage of real-time measurement, and T is transformer representative calculating time, UNFor the specified electricity of transformer
Pressure, t is the time；
Calculating rms current influences COEFFICIENT Ki:
Wherein, i is the transformer current of real-time measurement, INFor transformer rated current；
S6. dedicated meter influences COEFFICIENT K according to resulting transformer current i, voltage u, rms voltage is measureduIt is square
Root electric current influences COEFFICIENT Ki, calculated savings electric power and save electricity, then have:
Electric power is saved in calculating transformer replacement:
Wherein, Δ (Δ P), which represents, saves electric power, P0、Pk、SIM、SNRespectively refer to transformer rated no-load loss function before replacing
Rate, nominal load loss power, maximum load power, rated capacity；P′0、P′k、S′IM、S′NRespectively refer to transformer volume after replacing
Determine no-load loss power, nominal load loss power, maximum load power, rated capacity；
Electricity is saved in calculating transformer replacement:
Wherein, Δ (Δ E), which represents, saves electricity, P0、PkIt is transformer rated no-load loss power before respectively referring to replace, specified
Load loss power, Ku、KiRespectively referring to rms voltage influences coefficient, rms current influence coefficient, P '0、P′kIt respectively refers to more
Rear transformer rated no-load loss power, nominal load loss power are changed, T refers to transformer representative calculating time.
Boundary condition described in step S1 only refers to transformer body, that is, transformer body loss is reduced and saved after replacing
Quantity of electricity, including no-load loss and load loss ignore coupled power grid and reduction amount are lost accordingly.The base period
Before referring to the transformer replacement project implementation, for determining the period of replacement project energy consumption benchmark.The statistical report phase refers to use
In the period for determining transformer replacement project saving quantity of electricity.It is true to refer to reflection transformer the representative calculating time
The period of positive activity situation and calculating transformer operating parameter.
The instruments such as voltage transformer and current transformer described in step S2 should meet JJG 313-2010 measurement electricity consumption
Current transformer vertification regulation and JJG 314-2010 the measurement relevant regulations of voltage ct calibrating regulation.Reasonable control at
Under the premise of this, measurement accuracy is improved as far as possible.Use condition should meet national standard " current transformer ", related in " voltage transformer "
Regulation, daily maximum temperature are no more than 40 DEG C, and Daily minimum temperature is not less than -25 DEG C, and daily mean temperature is no more than 30 DEG C；Place to use
Height above sea level is lower than 1000m；It should be without serious pollution in atmosphere.
Dedicated meter described in step S2 should have the computing capability of root-mean-square value.Simultaneously comprising receive voltage transformer,
Current transformer measurement data function, the base period, statistical report phase, representative calculating time set-up function, save quantity of electricity
Computing function, wherein and data storage function.
Step S3, in S4, before and after transformer replacement, dedicated ammeter is by receiving voltage transformer, current transformer survey
Transformer voltage, current data, carry out the parameters such as no-load loss, load loss, rated capacity and maximum load power
It calculates, and is stored.
Rms voltage described in step S5 influences COEFFICIENT KuRefer to rms voltage and voltage in T representative calculating time
The ratio of rated value characterizes the degree of voltage deviation voltage rating in actual motion, can be according to formulaCalculate and
?；The rms current influences COEFFICIENT KiRefer to the ratio of RMS current and current rating in T representative calculating time, table
The degree that electric current in actual motion deviates rated current is levied, it can be according to formulaIt calculates and obtains；Dedicated meter tool
There is the function of seeking root mean square, above-mentioned parameter can be calculated according to the data that mutual inductor measuring obtains, and can be according to time of measuring
Passage, persistently parameter is calculated.
The replacement of transformer described in step S6 saves quantity of electricity and refers to that transformer replacement front and back body dissipation is reduced and saved
Quantity of electricity about only considers no-load loss PFeWith load loss PCu, other stray losses, such as lead, shell, fan etc.
Caused loss ratio is relatively small, therefore does not consider.The electric power of saving refers to that the economize on electricity power after transformer replacement refers to
Replacement front and back, when transformer load maximum, difference is lost in transformer efficiency.The saving electricity refers to than in situation, economizes on electricity
After measure implementation compared with before implementation, the quantity of electric energy reduction is consumed.
The dedicated meter can calculate maximum load power S according to the current and voltage data that mutual inductor measuring obtainsIM, specified appearance
Measure SN, rated no-load loss power P0, nominal load loss power PkIf not having on-the-spot test condition, P0、Pk、SNParameter
Also it can be obtained on transformer nameplate.Electric power is saved in the transformer replacement can be according to formulaIt calculates and obtains.
It includes no-load loss electricity Δ E that electricity is saved in the transformer replacementFeAnd load loss electricity Δ ECuTwo
Point, no-load loss electricity can be according to formulaIt calculates and obtains, load loss of electricity
It can be according to formulaIt calculates and obtains, electricity is saved in transformer replacement can be according to public affairs
FormulaIt calculates and obtains.
In view of transformer station high-voltage side bus voltage fluctuates near voltage rating substantially, therefore rms voltage shadow can be approximately considered
Ring COEFFICIENT Ku=1, no-load loss electricity can be reduced to Δ EFe=P0T.In this case, transformer replacement saving electricity can table
It is shown as
Transformer replacement based on root mean square of the invention saves the unilateral measurement method of quantity of electricity and specifically includes that determining item
Mesh boundary, base period, statistical report phase, representative calculating time；Voltage transformer, current transformer are installed in transformer side, with
And dedicated meter；Professional meter has the advanced computing function for seeking root-mean-square value, operating parameter, quantity of electricity；Pass through mutual inductance
Device measurement, dedicated meter calculate no-load loss, load loss, rated capacity, maximum before and after obtaining transformer replacement and meet function
The operating parameters such as rate, and stored；By the data being collected into, dedicated meter persistently calculate rms voltage influence coefficient,
Rms current influences the operating parameters such as coefficient；According to every operating parameter, what dedicated meter calculating transformer replacement was saved
Quantity of electricity.Method of the invention only need to install measuring device in transformer side, simplify measurement procedure, save measurement cost；
Coefficient is influenced by voltage rms current and calculates quantity of electricity, and measurement result is accurate, is applicable to accurate amount of energy saving and comments
Reducing energy consumption project of the valuation as clearing foundation.
The present invention has the following advantages and benefits compared with the existing technology:
(1) present invention proposes that the unilateral measurement method of quantity of electricity is saved in a kind of transformer replacement based on root mean square, it is only necessary to
Measuring device is installed in the side of transformer, universal single-ended metering method, is conducive to save the cost suitable for power grid, simplifies
Measurement procedure, with good economic efficiency and practical value.
(2) the unilateral measurement method of quantity of electricity is saved in a kind of transformer replacement based on root mean square proposed by the present invention, is led to
Crossing rms voltage influences COEFFICIENT Ku, rms current influence COEFFICIENT KiCalculated savings quantity of electricity, from the angle of Energy Equivalent point
Analysis, using the method based on root mean square relative to the method based on average value, theory deduction is rigorous, and measuring accuracy is higher, is applicable in
In the occasion for needing accurate calculating transformer energy consumption.
Detailed description of the invention
Fig. 1 is the flow chart that the unilateral measurement method of quantity of electricity is saved in the transformer replacement based on root mean square.
Fig. 2 is that power transformer of the invention replaces item boundaries schematic diagram.
Fig. 3 is wiring schematic diagram of the invention.
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and embodiments:
Embodiment one
(1) embodiment overview；
Transformer replacement project is divided into the replacement of the capacity such as highly effective transformer and highly effective transformer increase-volume replacement in the present embodiment,
To solve the problems, such as that the loss of transformer height and transformer capacity are insufficient.Become with S15, S13 type transformer replacement S7 type of equal capacity
For depressor, the quantity of electricity saved after the replacement of the capacity such as calculating transformer, Central Plains S7 type transformer is transported with 0.5 load factor
Row, transformer replacement afterload is constant, and transformer important technological parameters are shown in Table 1.
Table 1
(2) power system calculation is saved；
For step as shown in Figure 1, identifying project first boundary (as shown in Figure 2), base period, project statistics phase, exemplary operation are all
Phase takes 720 hours.The equipment (as shown in Figure 3) such as mutual inductor, dedicated ammeter are installed.In view of working voltage is generally in specified electricity
Near pressure, therefore rms voltage influences COEFFICIENT KuApproximation is taken as 1, utilizes transformer loss calculation formula are as follows:
In formula, rated no-load loss power P0With load loss PkIt can be obtained from transformer nameplate data or in-site measurement.
According to the load condition of transformer, count rms current influence coefficient be 0.6.Due to the appearances replacement such as being, it is assumed that replacement front and back
Apparent energy S under peak loadIM=189kW is calculated according to unilateral measurement economize on electricity power formula:
After calculating, the S7 type transformer for obtaining 315kVA capacity is changed to the S13 type transformer of equal capacity, the electric power of saving
Are as follows:
Equally, the S7 type transformer of 315kVA capacity is changed to the S15 type transformer of equal capacity, the electric power of saving are as follows:
(3) electricity is saved to calculate；
According to amount of electricity saving calculation formula:
After calculating, the S7 type transformer for obtaining 315kVA capacity is changed to the S13 type transformer of equal capacity, the electricity of saving
Are as follows:
Equally, the S7 type transformer of 315kVA capacity is changed to the S15 transformer of equal capacity, the electricity of saving are as follows:
(4) quantity of electricity is saved to summarize；
The present embodiment saving quantity of electricity summarizes as shown in table 2, and table 2 is that 315KVA S7 type transformer is changed to equal capacity
The quantity of electricity table of S13 or S15 transformer saving.
Table 2
Embodiment two
(1) embodiment overview；
Transformer replacement project is the replacement of the capacity such as highly effective transformer in the present embodiment, to wait S13 type transformer of capacity
S7 type transformer is replaced, to solve the problems, such as that transformer height is lost.Transformer important technological parameters are shown in Table 1.Respectively using based on flat
The method based on root mean square saves electricity after calculating replacement in the method and the present invention of equal electric current.Transformer station high-voltage side bus voltage is in volume
Near constant voltage, electric current per unit value is as shown in table 3 in one day, table 3 is transformer one day electric current per unit value table for 24 hours.
| Time/h | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Electric current/p.u. | 0.35 | 0.2 | 0.15 | 0.14 | 0.15 | 0.18 | 0.25 | 0.5 |
| Time/h | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| Electric current/p.u. | 0.59 | 0.68 | 0.71 | 0.61 | 0.6 | 0.65 | 0.68 | 0.68 |
| Time/h | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| Electric current/p.u. | 0.63 | 0.53 | 0.52 | 0.5 | 0.49 | 0.49 | 0.45 | 0.4 |
Table 3
(2) electricity is saved to calculate；
Taking the statistical report phase is 720 hours, and according to the method based on average current, the value for obtaining average current is
According to the saving electricity calculation formula based on average current
Saving electricity is calculated are as follows:
Δ (Δ E)=(0.862-0.34) × 720+ (4.97-3.65) × 0.462× 720=576.94kWh,
Root mean square method is based on according to the present invention, obtaining rms current influences COEFFICIENT KiFor
Saving electricity is calculated are as follows:
Δ (Δ E)=(0.862-0.34) × 720+ (4.97-3.65) × 0.502× 720=613.71kWh,
Saving quantity of electricity method due to the transformer replacement in the present invention based on root mean square is on the basis of Energy Equivalent
On, it is obtained according to the formula direct derivation of transformer noload losses electricity and load loss electricity, ignores the measurement of measuring device
When error, it is believed that calculated result is exact value, and calculated result based on average current 36.77kWh on the low side.By above-mentioned point
Analysis can be seen that the calculation method meeting based on average current, and there is a certain error, when transformer peak-valley difference further increases,
Error can also increase therewith.
The above, only the invention patent preferred embodiment, but the scope of protection of the patent of the present invention is not limited to
This, anyone skilled in the art is in the range disclosed in the invention patent, according to the present invention the skill of patent
Art scheme and its inventive concept are subject to equivalent substitution or change, belong to the scope of protection of the patent of the present invention.
Claims (5)
1. the unilateral measurement method of quantity of electricity is saved in a kind of transformer replacement based on root mean square, which is characterized in that including following
Step:
1) energy conservation replacement item boundaries, project base period, statistical report phase and representative calculating time are determined；
2) voltage transformer, current transformer and settable parameter and calculated savings quantity of electricity only are installed in transformer side
Dedicated meter；
3) before the transformer replacement project implementation, transformer current voltage, no-load loss, load in representative calculating time in base period are measured
Loss, rated capacity, maximum load power parameter；
4) after the transformer replacement project implementation, transformer current voltage in representative calculating time statistical report phase, unloaded damage are measured
Consumption, load loss, rated capacity, maximum load power parameter；
5) dedicated meter, which starts, continues computing module, and calculating rms voltage according to measurement the data obtained influences COEFFICIENT KuAnd
Square current influences COEFFICIENT Ki；
Calculating rms voltage influences COEFFICIENT Ku:
Wherein, u is the transformer voltage of real-time measurement, and T is transformer representative calculating time, UNFor transformer voltage rating, t is
Time；
Calculating rms current influences COEFFICIENT Ki:
Wherein, i is the transformer current of real-time measurement, INFor transformer rated current；
6) dedicated meter influences COEFFICIENT K according to resulting transformer current i, voltage u, rms voltage is measureduAnd rms current
Influence COEFFICIENT Ki, calculated savings electric power and save electricity, then have:
Electric power is saved in calculating transformer replacement:
Wherein, Δ (Δ P), which represents, saves electric power, P0、Pk、SIM、SNRespectively refer to transformer rated no-load loss power, volume before replacing
Fixed load loss power, maximum load power, rated capacity；P′0、P′k、S′IM、S′NRespectively refer to transformer rated no-load after replacing
Loss power, nominal load loss power, maximum load power, rated capacity；
Electricity is saved in calculating transformer replacement:
Wherein, Δ (Δ E), which represents, saves electricity, P0、PkRespectively refer to transformer rated no-load loss power, nominal load before replacing
Loss power, Ku、KiRespectively referring to rms voltage influences coefficient, rms current influence coefficient, P '0、P′kAfter respectively referring to replacement
Transformer rated no-load loss power, nominal load loss power, T refer to transformer representative calculating time.
2. the unilateral measurement method of quantity of electricity is saved in the transformer replacement according to claim 1 based on root mean square, special
Sign is that in step 2, Measured Boundary only includes the no-load loss and load loss of transformer.
3. the unilateral measurement method of quantity of electricity is saved in the transformer replacement according to claim 2 based on root mean square, special
Sign is that the dedicated meter is for seeking root mean square, for receiving voltage transformer, current transformer measurement data, being used for
Base period, statistical report phase, the setting of representative calculating time, the calculating for saving quantity of electricity and for every calculated result
Storage.
4. the unilateral measurement method of quantity of electricity is saved in the transformer replacement according to claim 3 based on root mean square, special
Sign is, while doing lasting calculating according to the passage of time of measuring.
5. the unilateral measurement method of quantity of electricity is saved in the transformer replacement according to claim 4 based on root mean square, special
Sign is, it is contemplated that transformer station high-voltage side bus voltage fluctuates near voltage rating substantially, it is believed that rms voltage influences COEFFICIENT Ku=
1, according to formula:
In formula, Δ (Δ E), which represents, saves electricity, P0、PkRespectively refer to transformer rated no-load loss power, nominal load before replacing
Loss power, KiRefer to that rms current influences coefficient, P '0、P′kRespectively refer to transformer rated no-load loss power, specified after replacement
Load loss power, T refer to transformer representative calculating time, calculate saving electricity.
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| CN107589330B (en) * | 2017-10-12 | 2024-01-30 | 海南电网有限责任公司电力科学研究院 | Live detection system and method for loss of power transformer |
| CN108718088B (en) * | 2018-07-06 | 2024-04-30 | 广东电网有限责任公司广州供电局 | On-load voltage and capacity regulating distribution transformer replacement judgment method and decision system |
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