CN104375035A - Method for testing energy efficiency of energy-saving device - Google Patents

Abstract

The invention discloses a method for testing energy efficiency of an energy-saving device. The method includes the steps that based on an IPMVP, a project boundary and a project evaluation scheme are determined before an energy-saving project is implemented; an energy-saving project reference period is determined, a pre-evaluation mathematical model is established, relevant element parameters and operating data in the reference period are gathered; in the reference period, the probably-saved power energy volume is pre-evaluated after the energy-saving project is implemented, and a pre-evaluation report is formed; an energy-saving project statistical report period is determined, a post-evaluation mathematical model is established, and relevant element parameters and operating data of the statistical report period are gathered; the actually-saved power energy volume is post-evaluated after the energy-saving project is implemented, and a measurement and verification report is formed. According to the method for testing energy efficiency of the energy-saving device, the defects that in the prior art, production efficiency is low, the energy-saving effect is poor can be overcome, and the advantages of high production efficiency and the good energy-saving effect are achieved.

Description

A kind of energy-efficient equipment energy efficiency test method

Technical field

The present invention relates to electric power energy-saving technical field, particularly, relate to a kind of energy-efficient equipment energy efficiency test method.

Background technology

China is a developing power, and the energy is but relatively deficient, and per capita energy's resources occupation amount is less than the half of world average level.Meanwhile, China is second largest energy resource consumption state in the world.Along with the high speed development of national economy, the demand of the energy is also constantly increased.And the non-renewable resources such as oil, coal are day by day exhausted, when inadequate resource, also there is the low and immoderate wasting of resources phenomenon of energy utilization rate in China.China's current EER international most advanced level is low 10 percentage points, and energy intensive product unit energy consumption average specific international most advanced level is high by 45%, and the environmental pollution caused thus and resource exhaustion problem are on the rise.Therefore how to realize the energy-conservation and existing energy of efficiency utilization and become the task of top priority.According to measuring and calculating, if national energy efficiency is improved 1 percentage point, can economize energy Fei130Yi Yuan energy problem.The widest as a kind of scope of application, to use most convenient clean energy resource, the sustainable development of electric energy has become the important foundation of national economy sustainable and healthy development.

Meanwhile, China is the maximum country of Global Carbon discharge capacity.China has promised to undertake that the year two thousand twenty per GDP carbon emission amount drops to the half of 2005.Sustainable economic development derive huge low-carbon (LC) new forms of energy and energy-efficient equipment demand.Energy-saving and emission-reduction, greatly develop low-carbon economy, and the adjustment energy and the industrial structure, being the core content of the economic construction of following China and social development, is huge challenge, difficult task.

Country is own reduces by 16% through the gross domestic product (GDP) energy resource consumption of clear and definite " 12 " end of term unit than the Eleventh Five-Year Plan end of term, energy-saving and cost-reducing target and economic growth target is placed on position of equal importance.As the main carriers of electric power conveying, electrical network is related to that electric power resource is distributed rationally, also for the reliable utilization of electric energy provides important leverage in China.

By applying new technology, new equipment, new technology, realize the efficiency utilization of resource, to improve electric network transportation ability, to reduce grid power transmission loss.At present, for building intelligent grid that is strong, self-healing, State Grid Corporation of China applies energy-saving type amorphous alloy distribution transformer, single-phase distribution transforming power supply mode, medium voltage distribution network boosting and transformation, restriction presses 6kV, high pressure 35kV electric pressure in eliminating, to optimize line voltage grade, install the harmonic-eliminating filtering such as New Reactive Power Compensation Device and the APF devices such as TSC, TCR, SVG additional; Force to eliminate backwardness, poor efficiency, high consumption equipment, and strengthen energy saving technical reconstruction energetically, realize energy saving technical reconstruction and fundamental construction, input in science and technology organically combine, enhance productivity, scientific and technical innovation promotes energy-saving and emission-reduction, is the effect of the realization of goal performance mainstay that national energy-saving reduces discharging.

New energy-saving equipments emerges in an endless stream, and the concrete Energy-saving Situation of new energy-saving equipments needs actual verification just can learn, and at present, seldom has the energy efficiency test method for new energy energy-efficient equipment and application scheme.

Realizing in process of the present invention, inventor finds at least to exist in prior art the defects such as the low and energy-saving effect difference of production efficiency.

Summary of the invention

The object of the invention is to, for the problems referred to above, propose a kind of energy-efficient equipment energy efficiency test method, to realize the advantage of production efficiency height and good energy-conserving effect.

For achieving the above object, the technical solution used in the present invention is: a kind of energy-efficient equipment energy efficiency test method, comprising:

Step 1: based on IPMVP, identify project before Energy-saving Projects enforcement border and project Te st grogram; Namely the coverage after Energy-saving Projects enforcement and Te st grogram is determined;

Step 2: determine Energy-saving Projects base period, sets up Pre-Evaluation mathematical model and collects base period related elements parameter and service data; Namely determine the time hourage of project calculated savings quantity of electricity, this time period, planted agent contained typical load operating mode, and then load condition on the estimation sets up Pre-Evaluation mathematical model, and collected related elements parameter and service data according to institute's established model;

Step 3: in base period, after implementing Energy-saving Projects, possible conservation of power electricity carries out Pre-Evaluation, forms Pre-Evaluation report; Namely according to built Pre-Evaluation model, project is expected that possible energy-saving effect is assessed, and form Pre-Evaluation report, analyze feasibility and the effect space of Energy-saving Projects;

Step 4: determine the Energy-saving Projects statistical report phase, sets up later evaluation mathematical model and collects statistical report phase related elements parameter and service data; Namely the time hourage of project calculated savings quantity of electricity is determined, this time period, planted agent contained typical load operating mode, then load condition on the estimation sets up later evaluation mathematical model, and collect related elements parameter and service data according to institute's established model, time base period hourage should be identical with statistical report phase time hourage;

Step 5: after implementing Energy-saving Projects, actual conservation of power electricity carries out later evaluation, is formed to measure and reports with checking; Namely according to built later evaluation model, energy-saving effect actual after the project implementation is assessed, and formation is measured and checking is reported, for actual energy-saving effect provides reliable basis, and can be analyzed with Pre-Evaluation report.

Further, in step 2 and step 4, collect related elements parameter harvester used, comprise measuring instrument, power quality analyzer, power analyzer, flue gas analyzer; And/or service data comprises electric current, voltage, diligent power, reactive power, relative harmonic content, flow, cold, illumination.

Further, in step 3, Energy-saving Projects implement before load condition according to expectation carry out the pre-estimation of conservation of power electricity, conservation of power electricity be now energy consumption after the emulation project implementation with under forecast demand operating mode, emulate the project implementation before the difference of energy consumption.

Further, in steps of 5, carry out the calculating of conservation of power electricity in the statistical report phase according to the load condition of reality, conservation of power electricity is now the difference of energy consumption actual after the project implementation and the energy consumption emulate the project implementation under forecast demand operating mode before.

Further, in step 1, described based on IPMVP, the operation of identify project before Energy-saving Projects enforcement border and project Te st grogram, specifically comprises:

According to the energy-conservation measurement in the world and certification code IPMVP, the peak load of amount of electricity saving and saving can be determined by the electricity before and after the relative energy-saving project implementation and load; Consider that Energy-saving Projects implements the change of front and back running environment and operating mode, " adjustment amount " in formula calculates, and need the energy input of base period and statistical report phase to substitute into same service condition, then amount of electricity saving is:

E _s＝E _ab-E _r(1-1)；

Economize on electricity power reflects the demand degree of electric energy, and demand degree is higher, and system disposition capacity is larger, and required investment is larger, and therefore, the reduction of peakload has great importance, thus power conservation should focus on the reduction of peak load, then power of economizing on electricity is:

P _s.max＝max(P _ab-P _r) (1-2)；

In formula:

E _samount of energy saving after-reducing energy consumption;

E _abkwh loss under energy consumption parameter simulation-base period, operating mode statistical report phase;

E _rkwh loss under statistical report phase operating mode after the enforcement of-Energy-saving Projects;

A _n-reference value adjusted value;

P _s.maxmaximum economize on electricity power before and after the-project implementation;

P _ab-raw parameter estimate or statistical report phase operating mode under power consumption;

P _r-new argument estimate or statistical report phase operating mode under power consumption.

Further, based on the energy-efficient equipment engineer applied scheme of this energy-efficient equipment energy efficiency test method, comprising:

2.1) transmission pressure application scheme

2.1.1) item boundaries

This project refers to that charge circuit changes the conservation of power electricity of front and back, and boundary demarcation is the transmission pressure of (not comprising line disconnecting switch) between sending end line disconnecting switch to receiving end line disconnecting switch;

2.1.2) mathematical model

Distribution network voltage grade is generally 110kV and following, to simplify the analysis, does not consider transmission pressure conductance loss over the ground herein, only considers the loss produced because of conductor resistance;

For accurately obtaining the conservation of power electricity before and after the project implementation, load condition should be adjusted to the load condition of expection or statistical report phase, if the active power of expection or report period is P ', average power factor is , then after adjustment, the power attenuation in stage base period is:

The power attenuation of expection or statistical report phase is:

Expection or report period conservation of power are:

Δ(ΔP)＝ΔP-ΔP′ (2-3)；

Expection or report period save power are:

$\mathrm{\Δ}\left(\mathrm{\ΔE}\right)=\underset{T}{\∫}\mathrm{\Δ}\left(\mathrm{\ΔP}\right)\mathrm{dt}=\underset{T}{\∫}(\mathrm{\ΔP}-\mathrm{\Δ}{P}^{\′})\mathrm{dt}---(2-4);$

2.1.3) scheme Pre-Evaluation

The loss of transmission pressure is conductance loss P over the ground _gwith line load loss P _rtwo parts sum, for the electric power system of 110kV, ignores conductance loss over the ground, as P '=P ' _maxtime, economize on electricity power obtains maximal value; Therefore, power Δ (Δ P) of economizing on electricity is:

Consider the accuracy of the operability that field data obtains and data processing, root-mean-square value P ' _rmswith average value P ' _avwith shape coefficient K _fproduct representation, amount of electricity saving Δ (Δ E) is:

Or the calculating of amount of electricity saving is carried out with peak load loss hourage, formula is as follows:

In formula:

R, R '-base period and expection transmission pressure resistance, unit ohm (Ω);

-expection transmission pressure power factor.When with P ' _avduring calculating, represent average power factor; When with P ' _maxduring calculating, represent power factor during maximum active power; Lower same;

U _i-base period transmission pressure rated voltage, unit kilovolt (kV);

P ' _maxthe maximum active power of-expection transmission pressure, per kilowatt (kW);

P ' _av-expection transmission pressure average active power, per kilowatt (kW);

K _f-shape coefficient;

T-expection transmission pressure working time, unit hour (h);

τ _max-expection peak load loss hourage, unit hour (h); Δ P _{total j}with number of working hours based on maximum load T _maxrelevant with line transmission power factor;

2.1.4) scheme later evaluation

Statistical report phase economize on electricity power Δ (Δ P) is:

$\mathrm{\Δ}\left(\mathrm{\ΔP}\right)=\mathrm{\Δ}{P}^{\′}(\frac{R}{R^{\′}}-1)---(2-8);$

Amount of electricity saving Δ (Δ E) is:

$\mathrm{\Δ}\left(\mathrm{\ΔE}\right)=\mathrm{\Δ}{E}^{\′}(\frac{R}{R^{\′}}-1)---(2-9);$

In formula:

R---base period transmission pressure resistance, unit ohm (Ω);

R'---statistical report phase transmission pressure resistance, unit ohm (Ω);

Δ P '---transmission pressure power attenuation in statistical report phase peak load situation, per kilowatt (kW);

Δ E '---the statistical report phase, transmission pressure electric energy loss, during per kilowatt (kWh);

2.2) highly effective transformer application scheme

2.2.1) item boundaries

This project refers to the quantity of electricity that before and after transformation, transformer is saved because body dissipation reduces, and only considers open circuit loss and load loss;

2.2.2) mathematical model

For accurately obtaining the conservation of power electricity before and after the project implementation, load condition should be adjusted to the load condition of expection or statistical report phase, if the load of expection or report period is S ', according to formula Δ P=P ₀+ β ²p _k, then after adjustment, the power attenuation in stage base period is:

$\mathrm{\ΔP}=P_0+{\left(\frac{S^{\′}}{S_N}\right)}^2{P}_k---(2-10);$

Expection or report period power attenuation are:

$\mathrm{\Δ}{P}^{\′}=P_0^{\′}+{\left(\frac{S^{\′}}{S_N^{\′}}\right)}^2{P}_k^{\′}---(2-11);$

Then expection or report period conservation of power are:

Δ(ΔP)＝ΔP-ΔP′ (2-12)；

Expection or report period save power are:

$\mathrm{\Δ}\left(\mathrm{\ΔE}\right)=\underset{T}{\∫}\mathrm{\Δ}\left(\mathrm{\ΔP}\right)\mathrm{dt}=\underset{T}{\∫}(\mathrm{\ΔP}-\mathrm{\Δ}{P}^{\′})\mathrm{dt}---(2-13);$

2.2.3) scheme Pre-Evaluation

Transformer transformation can be the integral replacing of transformer, or is only the replacing of iron core; When transformer capacity can not meet burden requirement or arrive the length of service, transformer needs integral replacing; When the light running time is longer, the replacement of transformer core can be carried out, to reduce the open circuit loss of transformer;

From above formula, as S '=S ' _maxtime, i.e. P '=P ' _maxtime, economize on electricity power obtains maximal value; Therefore, power Δ (Δ P) of economizing on electricity is:

Kwh loss formula is:

Consider the accuracy of the operability that field data obtains and data processing, root average P ' _rmswith average value P ' _avwith shape coefficient K _fproduct representation, then final amount of electricity saving Δ (Δ E) is:

Or the calculating of amount of electricity saving is carried out with peak load loss hourage, formula is as follows:

When only changing unshakable in one's determination, economize on electricity power Δ (Δ P) is:

Δ(ΔP)＝(P ₀-P′ ₀) (2-18)；

Amount of electricity saving Δ (Δ E) is:

Δ(ΔE)＝(P ₀-P′ ₀)T (2-19)；

In formula:

P ₀, P ' ₀-base period and expection transformer noload losses, per kilowatt (kW);

P _k, P ' _k-base period and expection transformer load loss, per kilowatt (kW);

S _n, S' _n-base period and the specified applied power of expection transformer, unit kilovolt-ampere (kVA);

-expection transformer efficiency factor, when with P ' _avduring calculating, represent average power factor; When with P ' _maxduring calculating, represent power factor during maximum active power; Lower same;

P ' _maxthe maximum active power of-expection transformer, per kilowatt (kW);

P ' _av-expection transformer average active power, per kilowatt (kW);

K _f-shape coefficient;

T-expection transformer working time, unit hour (h);

τ _max-expection peak load loss hourage, unit hour (h); τ _maxwith number of working hours based on maximum load T _maxrelevant with line transmission power factor, concrete data can consult subordinate list A;

2.2.4) scheme later evaluation

The economize on electricity power Δ (Δ P) of statistical report phase transformer is:

$\mathrm{\Δ}\left(\mathrm{\ΔP}\right)=(\frac{P_k/S_N^2}{P_k^{\′}/S_N^{\′2}}-1)\·\mathrm{\Δ}{P}^{\′}+P_0-\frac{P_k/S_N^2}{P_k^{\′}/S_N^{\′2}}.P_0^{\′};$

If transformer transformation only changes core material, amorphous alloy iron core substitutes traditional silicon steel plate iron core, only considers that Transformers Iron Loss reduces the economize on electricity power caused, and computing formula simplifies Δ (Δ P) and is:

Δ(ΔP)＝ΔP ₀-ΔP′ ₀(2-20)；

Statistical report phase amount of electricity saving Δ (Δ E) is:

$\mathrm{\Δ}\left(\mathrm{\ΔE}\right)=(\frac{P_k/{S_N}^2}{P_k^{\′}/S_N^{\′2}}-1)\·\mathrm{\Δ}{E}^{\′}+(P_0-\frac{P_k/{S_N}^2}{P_k^{\′}/S_N^{\′2}}\·P_0^{\′})\·T---(2-21);$

In formula:

P ₀, P ' ₀-base period and the transformer noload losses of statistical report phase, per kilowatt (kW);

P _k, P ' _k-base period and the transformer load loss of statistical report phase, per kilowatt (kW);

S _n, S' _n-base period and the specified applied power of statistical report phase transformer, unit kilovolt-ampere (kVA);

Δ P '---substation transformer power attenuation in statistical report phase peak load situation, per kilowatt (kW);

Δ E '---statistical report phase substation transformer electric energy loss, during per kilowatt (kWh);

T-statistical report phase transformer working time, unit hour (h).

The energy-efficient equipment energy efficiency test method of various embodiments of the present invention, owing to comprising: based on IPMVP, identify project before Energy-saving Projects enforcement border and project Te st grogram; Determine Energy-saving Projects base period, set up Pre-Evaluation mathematical model and collect base period related elements parameter and service data; In base period, after implementing Energy-saving Projects, possible conservation of power electricity carries out Pre-Evaluation, forms Pre-Evaluation report; Determine the Energy-saving Projects statistical report phase, set up later evaluation mathematical model and collect statistical report phase related elements parameter and service data; After implementing Energy-saving Projects, actual conservation of power electricity carries out later evaluation, is formed to measure to report with checking; Thus the defect of the low and energy-saving effect difference of production efficiency in prior art can be overcome, to realize the advantage of the high and good energy-conserving effect of production efficiency.

Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from instructions, or understand by implementing the present invention.

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

Accompanying drawing explanation

Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for instructions, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 is Energy-saving Projects implementing procedure figure in the present invention;

Fig. 2 measures and proof scheme boundary demarcation schematic diagram in the present invention;

Fig. 3 is economize on electricity power and amount of electricity saving schematic diagram in the present invention;

Fig. 4 is that in the present invention, Pre-Evaluation and later evaluation are measured and checking schematic diagram;

Fig. 5 is circuit transformation project boundary graph in the present invention;

Fig. 6 is transformer transformation project boundary graph in the present invention.

Embodiment

Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.

According to the embodiment of the present invention, as shown in figs 1 to 6, a kind of energy-efficient equipment energy efficiency test method is provided.

Technical scheme of the present invention, for new energy-saving equipments, proposes a kind of energy efficiency test method and application scheme, thus for newly energy-efficient equipment efficiency test and application technical support can be provided.The object of the invention is at international performance measurement and certification code (International Performance Measurement and Verification Protocol, IPMVP) on basis, a kind of energy efficiency test method of new energy energy-efficient equipment is proposed, mainly comprise Pre-Evaluation and later evaluation, simultaneously, for concrete energy-efficient equipment, embody corresponding energy-saving application scheme, the practical application of convenient and energy-saving equipment.

The technical solution adopted in the present invention is, a kind of new energy-saving equipments energy efficiency test method and application scheme, specifically comprises new energy-saving equipments energy efficiency test method and new energy-saving equipments engineer applied scheme two parts.Wherein, new energy-saving equipments energy efficiency test method is on the basis of IPMVP, for new energy-saving equipments, and a kind of energy efficiency test method of proposition.New energy-saving equipments engineer applied scheme is the concrete scheme that new energy-saving equipments is applied in practice, mainly comprises item boundaries, mathematic condition, scheme Pre-Evaluation and scheme later evaluation.

particularly, technical scheme of the present invention, by new energy-saving equipments energy efficiency test method and new energy-saving equipments engineering application scheme two parts form, and are described in detail below to these two parts.

1, new energy-saving equipments energy efficiency test method

On the basis of IPMVP, save the calculating thinking of quantity of electricity before proposing the project implementation, i.e. the test and appraisal in Pre-Evaluation stage.By Pre-Evaluation, energy-saving potential and the feasibility of Energy-saving Projects can be analyzed; And the analysis of later evaluation can contribute to for applying for that national energy-saving subsidy is shared energy saving profit with Energy Management Contract both sides and provided reliable basis.As shown in Figure 1, method comprises the steps: method idiographic flow

Step 1: identify project before Energy-saving Projects enforcement border and project Te st grogram; Namely determine the coverage after Energy-saving Projects enforcement and Te st grogram, specifically can describe in detail with reference to IPMVP.

Step 2: determine Energy-saving Projects base period, sets up Pre-Evaluation mathematical model and collects base period related elements parameter and service data; Namely determine the time hourage of project calculated savings quantity of electricity, this time period, planted agent contained typical load operating mode, and then load condition on the estimation sets up Pre-Evaluation mathematical model, and collected related elements parameter and service data according to institute's established model.

Step 3: in base period, after implementing Energy-saving Projects, possible conservation of power electricity carries out Pre-Evaluation, forms Pre-Evaluation report; Namely according to built Pre-Evaluation model, project is expected that possible energy-saving effect is assessed, and form Pre-Evaluation report, analyze feasibility and the effect space of Energy-saving Projects, for project implementation provides constructive suggestions.

Step 4: determine the Energy-saving Projects statistical report phase, sets up later evaluation mathematical model and collects statistical report phase related elements parameter and service data; Namely determine the time hourage of project calculated savings quantity of electricity, this time period, planted agent contained typical load operating mode, and then load condition on the estimation sets up later evaluation mathematical model, and collected related elements parameter and service data according to institute's established model.Time base period hourage should be identical with statistical report phase time hourage.

Step 5: after implementing Energy-saving Projects, actual conservation of power electricity carries out later evaluation, is formed to measure and reports with checking.Namely according to built later evaluation model, energy-saving effect actual after the project implementation is assessed, and formation is measured and checking is reported, for actual energy-saving effect provides reliable basis, and can be analyzed with Pre-Evaluation report, to find out shortcomings part, constantly improve project alternative, for Energy-saving Projects in the future establishes technical foundation.

Wherein, step 2 and step 4, collect related elements parameter, harvester used comprises measuring instrument, power quality analyzer, power analyzer, flue gas analyzer etc.; Service data comprises electric current, voltage, diligent power, reactive power, relative harmonic content, flow, cold, illumination etc.

Wherein, step 3 represent Energy-saving Projects implement before load condition according to expectation carry out the pre-estimation of conservation of power electricity, conservation of power electricity be now energy consumption after the emulation project implementation with under forecast demand operating mode, emulate the project implementation before the difference of energy consumption.

Wherein, step 5 represents carries out the calculating of conservation of power electricity in the statistical report phase according to the load condition of reality, conservation of power electricity be now energy consumption actual after the project implementation with under forecast demand operating mode, emulate the project implementation before the difference of energy consumption.

In addition, the conservation of power electricity that statistical report after date continues is related to adjustment and the enforcement of later stage Energy-saving Projects, therefore continue conservation of power electricity after tackling the statistical report phase to estimate, specifically can carry out load prediction accurately according to the production schedule of enterprise customer, extension, the market demand, to obtain relatively accurate load condition, estimate long-term conservation of power electricity, for offering suggestions property of the enforcement reference of later stage Energy-saving Projects, and change according to circumstances, due adjustment is made to project alternative, to obtain best energy-saving benefit.

Can realize increasing amount of energy saving by Evaluation on Energy Saving and transformation; The cost of investment of minimizing project or engineering; Contribute to manifesting energy efficiency projects and the value of regenerative resource investment to emissions reduction; The whole nation and industry organization is helped to improve resource efficiency, realize environmental goals.For electric power enterprise, efficiency test and appraisal can help electric power enterprise clear understanding electricity consumption situation, find out the maximum energy saving space and potentiality, and take the most effective conservation measures for energy-conservation point, thus with minimum input, obtain the optimum method of operation and maximum economic interests.IPMVP gives A, B, C, D tetra-kinds and measures and certificate scheme, has been described in detail one by one, and has given guiding suggestion, as shown in table 1 and Fig. 2.

Saving energy and decreasing loss in electrical network can be divided into economize on electricity power and amount of electricity saving two aspects, and both meanings are different.Economize on electricity and advocate to refer to the saving of power, unit is kW, and amount of electricity saving is the saving of electric flux, and unit is kWh.

For user, amount of electricity saving is the emphasis paid close attention to, because it is directly connected to the economic interests of user.And for electric power enterprise, both no less importants, save power can reduce the loss of electrical network, improves the transport capacity of electric energy, reduces economic loss.In addition, economize on electricity power illustrates the demand degree of electric energy, the reduction of user's requirement, and electric power enterprise can be made to invest compatilizing mechanism, just can meet peak load that is very high and that may also can rise.Thus decrease cost of investment, and avoid the excess loss that newly added equipment causes in electrical network, as shown in Figure 3.

According to stage evaluation time, whole measurement can be divided into Pre-Evaluation (base period) and two stages of later evaluation (statistical report phase) with checking, IPMVP introduces measurement and the checking of later evaluation amount of electricity saving, but do not go out to elaborate to economize on electricity masterpiece, and the lasting conservation of power electricity after not mentioned base period and report period.On the basis of IPMVP, further provide the conservation of power electricity in Pre-Evaluation stage, continue to monitor the necessity of conservation of power electricity after indicating the statistical report phase simultaneously, the monitoring continued can obtain the conservation of power electricity under various influence factor, highlight the long-term economic benefit of conservation of power electricity, also for measurement in the future and checking work provide valuable information material and guiding suggestion.

table 1: four classes are measured and proof scheme and determinative thereof and cost ratio

The essential distinction of Pre-Evaluation and later evaluation is that Pre-Evaluation partial electric amount cannot be measured, and load condition is in the future unknown, can only estimate its value or simulate, as the dotted line E in Fig. 4 (a) _aband E _rrepresent and estimate or the analogue value, represent that raw parameter is estimating the energy consumption under operating mode in the energy consumption estimated under operating mode and new argument respectively, and in the later evaluation stage, E _rcan actual measurement, E _abfor estimated value or the analogue value, as the E in Fig. 4 (b) _rfor solid line and E _abfor dotted line.

According to the energy-conservation measurement in the world and certification code (IPMVP), the peak load of amount of electricity saving and saving can be determined by the electricity before and after the relative energy-saving project implementation and load.Consider that Energy-saving Projects implements the change of front and back running environment and operating mode, " adjustment amount " in formula calculates, and needs the energy input of base period and statistical report phase to substitute into same service condition.Then amount of electricity saving is:

E _s＝E _ab-E _r(1-1)；

Economize on electricity power reflects the demand degree of electric energy, and demand degree is higher, and system disposition capacity is larger, and required investment is larger, and therefore, the reduction of peakload has great importance, thus power conservation should focus on the reduction of peak load, then power of economizing on electricity is:

P _s.max＝max(P _ab-P _r) (1-2)；

In formula:

E _samount of energy saving after-reducing energy consumption;

E _abkwh loss under energy consumption parameter simulation-base period, operating mode statistical report phase;

E _rkwh loss under statistical report phase operating mode after the enforcement of-Energy-saving Projects;

A _n-reference value adjusted value;

P _s.maxmaximum economize on electricity power before and after the-project implementation;

P _ab-raw parameter estimate or statistical report phase operating mode under power consumption;

P _r-new argument estimate or statistical report phase operating mode under power consumption.

Wherein reference value is divided into adjustment routinely and the adjustment of unconventional property, and adjusted value can be positive number or is negative.Wherein adjustment is predictable routinely, all can occur after whole transformation in period, and normally seasonal or circulation occurs, as climate change.

Unconventional property adjustment, this type of change is unpredictable, needs the situation of carrying out reference value adjustment to have: the quantity of equipment or the quantity of equipment use change; Reason due to criteria limit makes running environment condition change (as the adjustment of line voltage qualification rate, the adjustment etc. of plant running time).The situation of carrying out reference value adjustment is not needed to have: the variable that need adjust has been included in the mathematical model into project development; Variable effect is to the variable measured and certificate scheme is arranged; Determine that the equipment beyond amount of energy saving boundary changes.

2, new energy-saving equipments engineer applied scheme

2.1) Novel power transmission wire application scheme

2.1.1) item boundaries

This project refers to that charge circuit changes the conservation of power electricity of front and back.Boundary demarcation is the transmission pressure of (not comprising line disconnecting switch) between sending end line disconnecting switch (not comprising line disconnecting switch) to receiving end line disconnecting switch, as shown in Figure 5.

2.1.2) mathematical model

Distribution network voltage grade is generally 110kV and following, to simplify the analysis, does not consider transmission pressure conductance loss over the ground herein, only considers the loss produced because of conductor resistance.

For accurately obtaining the conservation of power electricity before and after the project implementation, load condition should be adjusted to the load condition of expection or statistical report phase, if the active power of expection or report period is P ', average power factor is , then after adjustment, the power attenuation in stage base period is:

The power attenuation of expection or statistical report phase is:

Expection or report period conservation of power are:

Δ(ΔP)＝ΔP-ΔP′ (2-3)；

Expection or report period save power are:

$\mathrm{\Δ}\left(\mathrm{\ΔE}\right)=\underset{T}{\∫}\mathrm{\Δ}\left(\mathrm{\ΔP}\right)\mathrm{dt}=\underset{T}{\∫}(\mathrm{\ΔP}-\mathrm{\Δ}{P}^{\′})\mathrm{dt}---(2-4);$

2.1.3) scheme Pre-Evaluation

The loss of transmission pressure is conductance loss P over the ground _gwith line load loss P _rtwo parts sum, for the electric power system of 110kV, can ignore conductance loss over the ground, as P '=P ' _maxtime, economize on electricity power obtains maximal value.Therefore, power Δ (Δ P) of economizing on electricity is:

Consider the accuracy of the operability that field data obtains and data processing, root-mean-square value P ' _rmswith average value P ' _avwith shape coefficient K _fproduct representation, amount of electricity saving Δ (Δ E) is:

Or the calculating of amount of electricity saving is carried out with peak load loss hourage, formula is as follows:

In formula:

R, R '-base period and expection transmission pressure resistance, unit ohm (Ω);

-expection transmission pressure power factor.When with P ' _avduring calculating, represent average power factor; When with P ' _maxduring calculating, represent power factor during maximum active power.Lower same;

U _i-base period transmission pressure rated voltage, unit kilovolt (kV);

P ' _maxthe maximum active power of-expection transmission pressure, per kilowatt (kW);

P ' _av-expection transmission pressure average active power, per kilowatt (kW);

K _f-shape coefficient;

T-expection transmission pressure working time, unit hour (h);

τ _max-expection peak load loss hourage, unit hour (h).Δ P _{total j}with number of working hours based on maximum load T _maxrelevant with line transmission power factor, concrete data can consult subordinate list A.

Pre-Evaluation conservation of power electricity calculates desired parameters source in table 2.

table 2: conservation of power electricity calculates desired parameters source

2.1.4) scheme later evaluation

Statistical report phase economize on electricity power Δ (Δ P) is:

$\mathrm{\Δ}\left(\mathrm{\ΔP}\right)=\mathrm{\Δ}{P}^{\′}(\frac{R}{R^{\′}}-1)---(2-8);$

Amount of electricity saving Δ (Δ E) is:

$\mathrm{\Δ}\left(\mathrm{\ΔE}\right)=\mathrm{\Δ}{E}^{\′}(\frac{R}{R^{\′}}-1)---(2-9);$

In formula:

R---base period transmission pressure resistance, unit ohm (Ω);

R'---statistical report phase transmission pressure resistance, unit ohm (Ω);

Δ P '---transmission pressure power attenuation in statistical report phase peak load situation, per kilowatt (kW);

Δ E '---the statistical report phase, transmission pressure electric energy loss, during per kilowatt (kWh).

Later evaluation conservation of power electricity calculates desired parameters source in table 3.

table 3: conservation of power electricity calculates desired parameters source

2.2) highly effective transformer application scheme

2.2.1) item boundaries

This project refers to the quantity of electricity that before and after transformation, transformer is saved because body dissipation reduces, and only considers open circuit loss (iron loss) and load loss (copper loss).Therefore, item boundaries is transformer body.

2.2.2) mathematical model

For accurately obtaining the conservation of power electricity before and after the project implementation, load condition should be adjusted to the load condition of expection or statistical report phase, if the load of expection or report period is S ', according to formula Δ P=P ₀+ β ²p _k, then after adjustment, the power attenuation in stage base period is:

$\mathrm{\ΔP}=P_0+{\left(\frac{S^{\′}}{S_N}\right)}^2{P}_k---(2-10);$

Expection or report period power attenuation are:

$\mathrm{\Δ}{P}^{\′}=P_0^{\′}+{\left(\frac{S^{\′}}{S_N^{\′}}\right)}^2{P}_k^{\′}---(2-11);$

Then expection or report period conservation of power are:

Δ(ΔP)＝ΔP-ΔP′ (2-12)；

Expection or report period save power are:

$\mathrm{\Δ}\left(\mathrm{\ΔE}\right)=\underset{T}{\∫}\mathrm{\Δ}\left(\mathrm{\ΔP}\right)\mathrm{dt}=\underset{T}{\∫}(\mathrm{\ΔP}-\mathrm{\Δ}{P}^{\′})\mathrm{dt}---(2-13);$

2.2.3) scheme Pre-Evaluation

Transformer transformation can be the integral replacing of transformer, or is only the replacing of iron core.When transformer capacity can not meet burden requirement or arrive the length of service, transformer needs integral replacing; When the light running time is longer, the replacement of transformer core can be carried out, to reduce the open circuit loss of transformer.

From above formula, as S '=S ' _maxtime, i.e. P '=P ' _maxtime, economize on electricity power obtains maximal value.Therefore, power Δ (Δ P) of economizing on electricity is:

Kwh loss formula is:

Consider the accuracy of the operability that field data obtains and data processing, root average P ' _rmswith average value P ' _avwith shape coefficient K _fproduct representation, then final amount of electricity saving Δ (Δ E) is:

Or the calculating of amount of electricity saving is carried out with peak load loss hourage, formula is as follows:

When only changing unshakable in one's determination, economize on electricity power Δ (Δ P) is:

Δ(ΔP)＝(P ₀-P′ ₀) (2-18)；

Amount of electricity saving Δ (Δ E) is:

Δ(ΔE)＝(P ₀-P′ ₀)T (2-19)；

In formula:

P ₀, P ' ₀-base period and expection transformer noload losses, per kilowatt (kW);

P _k, P ' _k-base period and expection transformer load loss, per kilowatt (kW);

S _n, S' _n-base period and the specified applied power of expection transformer, unit kilovolt-ampere (kVA);

-expection transformer efficiency factor, when with P ' _avduring calculating, represent average power factor; When with P ' _maxduring calculating, represent power factor during maximum active power.Lower same;

P ' _maxthe maximum active power of-expection transformer, per kilowatt (kW);

P ' _av-expection transformer average active power, per kilowatt (kW);

K _f-shape coefficient;

T-expection transformer working time, unit hour (h);

τ _max-expection peak load loss hourage, unit hour (h).τ _maxwith number of working hours based on maximum load T _maxrelevant with line transmission power factor, concrete data can consult subordinate list A.

Subordinate list A

Peak load loss time τ _maxwith number of working hours based on maximum load T _maxrelation

Pre-Evaluation conservation of power electricity calculates desired parameters source in table 4.

table 4: conservation of power electricity calculates desired parameters source

2.2.4) scheme later evaluation

The economize on electricity power Δ (Δ P) of statistical report phase transformer is:

$\mathrm{\Δ}\left(\mathrm{\ΔP}\right)=(\frac{P_k/S_N^2}{P_k^{\′}/S_N^{\′2}}-1)\·\mathrm{\Δ}{P}^{\′}+P_0-\frac{P_k/S_N^2}{P_k^{\′}/S_N^{\′2}}.P_0^{\′};$

If transformer transformation only changes core material, such as: amorphous alloy iron core substitutes traditional silicon steel plate iron core, only consider that Transformers Iron Loss reduces the economize on electricity power caused, computing formula simplifies Δ (Δ P) and is:

Δ(ΔP)＝ΔP ₀-ΔP′ ₀(2-20)；

Statistical report phase amount of electricity saving Δ (Δ E) is:

$\mathrm{\Δ}\left(\mathrm{\ΔE}\right)=(\frac{P_k/{S_N}^2}{P_k^{\′}/S_N^{\′2}}-1)\·\mathrm{\Δ}{E}^{\′}+(P_0-\frac{P_k/{S_N}^2}{P_k^{\′}/S_N^{\′2}}\·P_0^{\′})\·T---(2-21);$

In formula:

P ₀, P ' ₀-base period and the transformer noload losses of statistical report phase, per kilowatt (kW);

P _k, P ' _k-base period and the transformer load loss of statistical report phase, per kilowatt (kW);

S _n, S' _n-base period and the specified applied power of statistical report phase transformer, unit kilovolt-ampere (kVA);

Δ P '---substation transformer power attenuation in statistical report phase peak load situation, per kilowatt (kW);

Δ E '---statistical report phase substation transformer electric energy loss, during per kilowatt (kWh);

T-statistical report phase transformer working time, unit hour (h).

Later evaluation conservation of power electricity calculates desired parameters source in table 5.

Table 5: conservation of power electricity calculates desired parameters source

In sum, the invention has the beneficial effects as follows, by setting up the energy efficiency test method of new energy-saving equipments, the energy-saving effect of new energy-saving equipments is verified, be convenient to that equipment investment is actual to be applied, set up engineer applied scheme, the practical application for equipment provides feasible technological means and method simultaneously, and energy-efficient equipment is more reasonably applied.

Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (6)

1. an energy-efficient equipment energy efficiency test method, is characterized in that, comprising:

Step 1: based on IPMVP, identify project before Energy-saving Projects enforcement border and project Te st grogram; Namely the coverage after Energy-saving Projects enforcement and Te st grogram is determined;

Step 2: determine Energy-saving Projects base period, sets up Pre-Evaluation mathematical model and collects base period related elements parameter and service data; Namely determine the time hourage of project calculated savings quantity of electricity, this time period, planted agent contained typical load operating mode, and then load condition on the estimation sets up Pre-Evaluation mathematical model, and collected related elements parameter and service data according to institute's established model;

Step 3: in base period, after implementing Energy-saving Projects, possible conservation of power electricity carries out Pre-Evaluation, forms Pre-Evaluation report; Namely according to built Pre-Evaluation model, project is expected that possible energy-saving effect is assessed, and form Pre-Evaluation report, analyze feasibility and the effect space of Energy-saving Projects;

Step 4: determine the Energy-saving Projects statistical report phase, sets up later evaluation mathematical model and collects statistical report phase related elements parameter and service data; Namely the time hourage of project calculated savings quantity of electricity is determined, this time period, planted agent contained typical load operating mode, then load condition on the estimation sets up later evaluation mathematical model, and collect related elements parameter and service data according to institute's established model, time base period hourage should be identical with statistical report phase time hourage;

Step 5: after implementing Energy-saving Projects, actual conservation of power electricity carries out later evaluation, is formed to measure and reports with checking; Namely according to built later evaluation model, energy-saving effect actual after the project implementation is assessed, and formation is measured and checking is reported, for actual energy-saving effect provides reliable basis, and can be analyzed with Pre-Evaluation report.

2. energy-efficient equipment energy efficiency test method according to claim 1, is characterized in that, in step 2 and step 4, collects related elements parameter harvester used, comprises measuring instrument, power quality analyzer, power analyzer, flue gas analyzer; And/or service data comprises electric current, voltage, diligent power, reactive power, relative harmonic content, flow, cold, illumination.

3. energy-efficient equipment energy efficiency test method according to claim 1 and 2, it is characterized in that, in step 3, Energy-saving Projects implement before load condition according to expectation carry out the pre-estimation of conservation of power electricity, conservation of power electricity be now energy consumption after the emulation project implementation with under forecast demand operating mode, emulate the project implementation before the difference of energy consumption.

4. energy-efficient equipment energy efficiency test method according to claim 3, it is characterized in that, in steps of 5, carry out the calculating of conservation of power electricity in the statistical report phase according to the load condition of reality, conservation of power electricity is now the difference of energy consumption actual after the project implementation and the energy consumption emulate the project implementation under forecast demand operating mode before.

5. the energy-efficient equipment energy efficiency test method according to any one of claim 1-4, is characterized in that, in step 1, described based on IPMVP, and the operation of identify project before Energy-saving Projects enforcement border and project Te st grogram, specifically comprises:

According to the energy-conservation measurement in the world and certification code IPMVP, the peak load of amount of electricity saving and saving can be determined by the electricity before and after the relative energy-saving project implementation and load; Consider that Energy-saving Projects implements the change of front and back running environment and operating mode, " adjustment amount " in formula calculates, and need the energy input of base period and statistical report phase to substitute into same service condition, then amount of electricity saving is:

E _s＝E _ab-E _r(1-1)；

Economize on electricity power reflects the demand degree of electric energy, and demand degree is higher, and system disposition capacity is larger, and required investment is larger, and therefore, the reduction of peakload has great importance, thus power conservation should focus on the reduction of peak load, then power of economizing on electricity is:

P _s.max＝max(P _ab-P _r) (1-2)；

In formula:

E _samount of energy saving after-reducing energy consumption;

E _abkwh loss under energy consumption parameter simulation-base period, operating mode statistical report phase;

E _rkwh loss under statistical report phase operating mode after the enforcement of-Energy-saving Projects;

A _n-reference value adjusted value;

P _s.maxmaximum economize on electricity power before and after the-project implementation;

P _ab-raw parameter estimate or statistical report phase operating mode under power consumption;

P _r-new argument estimate or statistical report phase operating mode under power consumption.

6. the energy-efficient equipment energy efficiency test method according to any one of claim 1-4, is characterized in that, based on the energy-efficient equipment engineer applied scheme of this energy-efficient equipment energy efficiency test method, comprising:

2.1) transmission pressure application scheme

2.1.1) item boundaries

This project refers to that charge circuit changes the conservation of power electricity of front and back, and boundary demarcation is the transmission pressure of (not comprising line disconnecting switch) between sending end line disconnecting switch to receiving end line disconnecting switch;

2.1.2) mathematical model

Distribution network voltage grade is generally 110kV and following, to simplify the analysis, does not consider transmission pressure conductance loss over the ground herein, only considers the loss produced because of conductor resistance;

For accurately obtaining the conservation of power electricity before and after the project implementation, load condition should be adjusted to the load condition of expection or statistical report phase, if the active power of expection or report period is P ', average power factor is then after adjustment, the power attenuation in stage base period is:

The power attenuation of expection or statistical report phase is:

Expection or report period conservation of power are:

Δ(ΔP)＝ΔP-ΔP′ (2-3)；

Expection or report period save power are:

$\mathrm{\Δ}\left(\mathrm{\ΔE}\right)=\underset{T}{\∫}\mathrm{\Δ}\left(\mathrm{\ΔP}\right)\mathrm{dt}=\underset{T}{\∫}(\mathrm{\ΔP}-{\mathrm{\ΔP}}^{\′})\mathrm{dt}---(2-4);$

2.1.3) scheme Pre-Evaluation

The loss of transmission pressure is conductance loss P over the ground _gwith line load loss P _rtwo parts sum, for the electric power system of 110kV, ignores conductance loss over the ground, as P '=P ' _maxtime, economize on electricity power obtains maximal value; Therefore, power Δ (Δ P) of economizing on electricity is:

Consider the accuracy of the operability that field data obtains and data processing, root-mean-square value P ' _rmsuse mean value

P ' _avwith shape coefficient K _fproduct representation, amount of electricity saving Δ (Δ E _{) be}:

Or the calculating of amount of electricity saving is carried out with peak load loss hourage, formula is as follows:

In formula:

R, R '-base period and expection transmission pressure resistance, unit ohm (Ω);

-expection transmission pressure power factor.When with P ' _avduring calculating, represent average power factor; When with P ' _maxduring calculating, represent power factor during maximum active power; Lower same;

U _i-base period transmission pressure rated voltage, unit kilovolt (kV);

P ' _maxthe maximum active power of-expection transmission pressure, per kilowatt (kW);

P ' _av-expection transmission pressure average active power, per kilowatt (kW);

K _f-shape coefficient;

T-expection transmission pressure working time, unit hour (h);

τ _max-expection peak load loss hourage, unit hour (h); Δ P _{total j}with number of working hours based on maximum load T _maxrelevant with line transmission power factor;

2.1.4) scheme later evaluation

Statistical report phase economize on electricity power Δ (Δ P) is:

$\mathrm{\Δ}\left(\mathrm{\ΔP}\right)={\mathrm{\ΔP}}^{\′}(\frac{R}{R^{\′}}-1)---(2-8);$

Amount of electricity saving Δ (Δ E) is:

$\mathrm{\Δ}\left(\mathrm{\ΔE}\right)={\mathrm{\ΔE}}^{\′}(\frac{R}{R^{\′}}-1)---(2-9);$

In formula:

R---base period transmission pressure resistance, unit ohm (Ω);

R'---statistical report phase transmission pressure resistance, unit ohm (Ω);

Δ P '---transmission pressure power attenuation in statistical report phase peak load situation, per kilowatt (kW);

Δ E '---the statistical report phase, transmission pressure electric energy loss, during per kilowatt (kWh);

2.2) highly effective transformer application scheme

2.2.1) item boundaries

This project refers to the quantity of electricity that before and after transformation, transformer is saved because body dissipation reduces, and only considers open circuit loss and load loss;

2.2.2) mathematical model

For accurately obtaining the conservation of power electricity before and after the project implementation, load condition should be adjusted to the load condition of expection or statistical report phase, if the load of expection or report period is S ', according to formula Δ P=P ₀+ β ²p _k, then after adjustment, the power attenuation in stage base period is:

$\mathrm{\ΔP}=P_0+{\left(\frac{S^{\′}}{S_N}\right)}^2{P}_k---(2-10);$

Expection or report period power attenuation are:

${\mathrm{\ΔP}}^{\′}=P_0^{\′}+{\left(\frac{S^{\′}}{S_N^{\′}}\right)}^2{P}_k^{\′}---(2-11);$

Then expection or report period conservation of power are:

Δ(ΔP)＝ΔP-ΔP′ (2-12)；

Expection or report period save power are:

$\mathrm{\Δ}\left(\mathrm{\ΔE}\right)=\underset{T}{\∫}\mathrm{\Δ}\left(\mathrm{\ΔP}\right)\mathrm{dt}=\underset{T}{\∫}(\mathrm{\ΔP}-{\mathrm{\ΔP}}^{\′})\mathrm{dt}---(2-13);$

2.2.3) scheme Pre-Evaluation

Transformer transformation can be the integral replacing of transformer, or is only the replacing of iron core; When transformer capacity can not meet burden requirement or arrive the length of service, transformer needs integral replacing; When the light running time is longer, the replacement of transformer core can be carried out, to reduce the open circuit loss of transformer;

From above formula, as S '=S ' _maxtime, i.e. P '=P ' _maxtime, economize on electricity power obtains maximal value; Therefore, power Δ (Δ P) of economizing on electricity is:

Kwh loss formula is:

Consider the accuracy of the operability that field data obtains and data processing, root average P ' _rmswith average value P ' _avwith shape coefficient K _fproduct representation, then final amount of electricity saving Δ (Δ E) is:

Or the calculating of amount of electricity saving is carried out with peak load loss hourage, formula is as follows:

When only changing unshakable in one's determination, economize on electricity power Δ (Δ P) is:

Δ(ΔP)＝(P ₀-P′ ₀) (2-18)；

Amount of electricity saving Δ (Δ E) is:

Δ(ΔE)＝(P ₀-P′ ₀)T(2-19)；

In formula:

P ₀, P ' ₀-base period and expection transformer noload losses, per kilowatt (kW);

P _k, P ' _k-base period and expection transformer load loss, per kilowatt (kW);

S _n, S' _n-base period and the specified applied power of expection transformer, unit kilovolt-ampere (kVA);

-expection transformer efficiency factor, when with P ' _avduring calculating, represent average power factor; When with

P ' _maxduring calculating, represent power factor during maximum active power; Lower same;

P ' _maxthe maximum active power of-expection transformer, per kilowatt (kW);

P ' _av-expection transformer average active power, per kilowatt (kW);

K _f-shape coefficient;

T-expection transformer working time, unit hour (h);

τ _max-expection peak load loss hourage, unit hour (h); τ _maxwith number of working hours based on maximum load T _maxrelevant with line transmission power factor, concrete data can consult subordinate list A;

2.2.4) scheme later evaluation

The economize on electricity power Δ (Δ P) of statistical report phase transformer is:

$\mathrm{\Δ}\left(\mathrm{\ΔP}\right)=(\frac{P_k/S_N^2}{P_k^{\′}/S_N^{\′2}}-1)\·{\mathrm{\ΔP}}^{\′}+P_0-\frac{P_k/S_N^2}{P_k^{\′}/S_N^{\′2}}\·P_0^{\′};$

If transformer transformation only changes core material, amorphous alloy iron core substitutes traditional silicon steel plate iron core, only considers that Transformers Iron Loss reduces the economize on electricity power caused, and computing formula simplifies Δ (Δ P) and is:

Δ(ΔP)＝ΔP ₀-ΔP′ ₀(2-20)；

Statistical report phase amount of electricity saving Δ (Δ E) is:

$\mathrm{\Δ}\left(\mathrm{\ΔE}\right)=(\frac{P_k/{S_N}^2}{P_k^{\′}/S_N^{{\′}^2}}-1)\·{\mathrm{\ΔE}}^{\′}+(P_0-\frac{P_k/{S_N}^2}{P_k^{\′}/S_N^{{\′}^2}}\·P_0^{\′})\·T---(2-21);$

In formula:

P ₀, P ' ₀-base period and the transformer noload losses of statistical report phase, per kilowatt (kW);

P _k, P ' _k-base period and the transformer load loss of statistical report phase, per kilowatt (kW);

S _n, S' _n-base period and the specified applied power of statistical report phase transformer, unit kilovolt-ampere (kVA);

Δ P '---substation transformer power attenuation in statistical report phase peak load situation, per kilowatt (kW);

Δ E '---statistical report phase substation transformer electric energy loss, during per kilowatt (kWh);

T-statistical report phase transformer working time, unit hour (h).