JP5937670B2 - Calculation method of energy saving effect of transformer - Google Patents

Description

The present invention relates to a method for calculating an energy saving effect of a transformer, and more particularly to an energy saving effect calculating method suitable for evaluating the power consumption ( loss ) power of a transformer and grasping the energy saving effect.

  From the viewpoint of increasing concern about global environmental issues and saving resources, there is a growing interest in energy conservation among companies.

The system for calculating the effective way of energy saving, for example, in Patent Document 1, in case of introducing good inverter energy efficient, method for evaluating the energy-saving effect is disclosed.

  Patent Document 2 discloses a system in which a measurement circuit is installed in a customer's transformer, the amount of power in an actual operation state is received as electronic data, and a renewal plan for the customer's transformer is returned based on the received data. Is disclosed.

Japanese Patent No. 3976988 Japanese Patent No. 2003-85430

Patent Document 1, when introduced inverter to the state of equipment, from the difference between the accumulated energy of the previous inverter introduction (loss) power inverter before introduction of the integrated consumption and (loss) power, consumption (losses) electric energy A method for calculating and calculating the saved electricity bill is disclosed.

  However, transformers are classified as electrical devices like generators and motors, but they may be stationary devices that are different from rotating machines such as generators and motors. There are few electric devices with high efficiency. Further, among transformers, amorphous transformers with very little no-load loss are extremely efficient transformers and have been considered to have a high energy saving effect.

Thus transformer, energy efficient appliances (usually over 97%) because it is, unlike the large power machines consumption energy consumption (sonde) power to Jijikokkoku changes in respect transformer There was no one that could monitor the change in the power and display the economic benefits of cumulative power consumption ( loss ) savings.

Moreover, in patent document 2, when introducing a new transformer, the difference of the consumption ( loss ) electric power on a catalog specification is only calculated, and the energy saving effect by it is only praised.

  However, in Patent Document 2, there is a problem that when a customer introduces a new transformer, it is impossible to grasp how much energy saving effect and economic effect are obtained after introduction compared to before replacement.

The present invention has been made to solve the above problems, and an object, in a transformer, a comparison of Jijikokkoku consumption changes (losses) power of a conventional transformer and newly established transformer, easily It is an object of the present invention to provide a method for calculating the energy saving effect of a transformer that can be performed and that makes it easy to grasp the accumulated economic advantages.

  The power evaluation system for a transformer of the present invention is a power evaluation system for a transformer that evaluates the loss of the transformer corresponding to the load when the transformer is interposed between the load and the power supply to supply power. A power measuring device that collects electrical data such as an active power amount, power factor, and current for the load, and a computer that is connected to the power measuring device and receives the electrical data collected by the power measuring device. .

  Then, when calculating the energy saving effect of the transformer for evaluating the loss of the transformer, the computer receives the electrical data during the operation of the updated transformer, and based on that, the computer calculates the loss of the updated transformer. The difference from the loss in the transformer before the update is obtained and output as a reduced loss.

  Further, the loss of the transformer before the update for each load factor and the loss of the transformer after the update are compared with each other and displayed on the display device.

Also, consumption (loss) of the transformer before update per unit time and the amount of power consumption (loss) of the transformer after the update in the form of comparing the amount of power, is displayed on the display device.

Further, the amount of power consumed ( loss ) of the transformer before the update and the amount of energy saving obtained from the amount of consumed ( loss ) power of the transformer after the update are compared with the energy saving amount of the contract and displayed on the display device.

In addition, the amount of energy consumed ( loss ) of the transformer before the update and the cumulative energy saving amount or amount over time determined from the amount of consumed ( loss ) power of the transformer after the update are displayed on the display device. .

According to the present invention, the transformer for industrial, a comparison of Jijikokkoku consumption changes (losses) power of a conventional transformer and newly established transformer, can be easily performed, a cumulative economic It is to provide a method for calculating the energy saving effect of a transformer that makes it easy to grasp the advantages.

It is a block diagram of the electric power evaluation system of the transformer which concerns on one Embodiment of this invention. It is a bar graph which shows the fluctuation | variation of the load factor for every time. It is the bar graph which showed the actual data of the fluctuation | variation of the load factor for every time. It is a graph explaining the case where a load factor is calculated in consideration of a power factor from the amount of active power for one hour. It is a graph explaining the case where a load factor is calculated from the electric current in a predetermined sampling interval. It is a flowchart which shows the process which calculates | requires the difference of the loss before and after the update of a transformer from an equivalent load factor. It is the graph which contrasted and showed the loss of the transformer before an update at the time of changing a load factor, and after an update. It is the graph which showed the reduction loss when changing a load factor. It is a graph which shows the change of the effect of the energy saving amount per unit time. It is a graph for contrasting the comparison with the energy saving amount for a contract when renewing a transformer. It is a graph which shows the cumulative effect by energy saving.

Hereinafter, an embodiment according to the present invention will be described with reference to FIGS.
First, the configuration of a transformer power evaluation system according to an embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a configuration diagram of a power evaluation system for a transformer according to an embodiment of the present invention.

  This embodiment demonstrates the system in case a power supply is a three-phase alternating current power supply and a load operate | moves by a three-phase alternating current.

  The configuration of the transformer power evaluation system according to this embodiment includes a power supply 00, a transformer 10, a load 20, a power measuring device 30, an IF unit 40, a computer 100, a display device 111, a keyboard 121, a mouse 122, and an HDD 140. .

  The power source 00 is, for example, a three-phase AC power source, and may be an external power source or an internal power source of equipment.

  The transformer 10 is a power device that converts the voltage level of AC power on the primary side (input side) using electromagnetic induction and outputs the converted voltage to the secondary side (output side). In the present embodiment, the transformer is a three-phase transformer.

  The load 20 is a device that actually consumes power in the facility, such as a motor or a compressor.

  The power measuring device 30 is a device for measuring current, voltage, power, and electric energy in alternating current and collecting data.

  The IF unit 40 is a unit for connecting the power measurement device 30 and the computer 100, and is connected to the power measurement device 30 by a dedicated communication line and to the computer 100 by a general-purpose serial IF.

The computer 100 has a configuration in which a CPU (Central Processing Unit) 101, a serial IF 102, a main storage device 103, a graphic IF 110 , an input / output IF 120 , and an auxiliary storage device IF 130 are coupled by a bus.

The CPU 101 controls each unit of the computer 100 and loads a program for power evaluation into the main storage device 103 and executes it.

The serial IF 102 is an interface for connecting to the IF unit 40.

The main storage device 103 is usually composed of a volatile memory such as a RAM, and stores a program executed by the CPU 101 and data to be referenced.

The graphic IF 110 is an interface for connecting a display device 111 such as an LCD (Liquid Crystal Display).

  The input / output IF 120 is an interface for connecting an input / output device. In the example of FIG. 1, a keyboard 121 and a mouse 122 of a pointing device are connected.

The auxiliary storage device IF 130 is an interface for connecting an auxiliary storage device such as an HDD (Hard Disk Drive) 140 or a DVD drive (Digital Versatile Disk) (not shown).

HDD140 has a storage capacity of the large capacity, the data collection program 141 for executing the present embodiment, the power calculation program 142, the display program 143, the power charge Kanegae calculation program 144 is stored.

  The data collection program 141 is a program for collecting data from the power measurement device 30.

  The power calculation program 142 is a program for counting and processing collected data.

  The display program 143 is a program for displaying collected data and processed data as a table or a graph.

The power rate conversion program 144 is a program for converting the amount of consumed ( loss ) power into an electricity rate.

Next, a first power evaluation method by the transformer power evaluation system according to the embodiment of the present invention will be described with reference to FIGS.
First, the concept of load factor and actual measurement will be described with reference to FIGS. 2 and 3.
FIG. 2 is a bar graph showing fluctuations in load factor over time.
FIG. 3 is a bar graph showing actual data of fluctuations in load factor over time.

  As a method of calculating the loss reduction effect when upgrading from an existing transformer to a newly installed transformer, the load factor for a certain period after the update has been calculated and updated based on that load factor. A general technique is to calculate the loss of the previous transformer from the catalog specification, and calculate the loss of the transformer after the update from the catalog specification, and calculate the effect by the difference.

Originally, the loss of the transformer is calculated from the "load loss" and "no-load loss " described in the catalog specifications using the equivalent load factor, but since the calculation of the equivalent load factor is troublesome, In many cases, an average load factor is used, and when there are many load fluctuations, accuracy may be insufficient. In addition, the calculation of the loss is not continuously performed, and the loss calculation is often performed manually with a frequency of once a month or once a year.

  Therefore, in the present embodiment, the loss is automatically calculated by the computer 100 based on the equivalent load factor as follows.

  To measure the energy loss of a transformer, load factor is used as a reference. Since the actual operation time of the transformer varies in a complicated manner, the daily load curve is divided by unit time, and the equivalent load factor is calculated as a stepped bar graph.

  The load factor is expressed by the following (formula 1).

Load factor = (apparent power) / transformer capacity = (active power ÷ power factor) / transformer capacity ≒ (active power ÷ power factor) / transformer capacity ... (Equation 1)
In the case of FIG. 3 , the equivalent load factor when the sampling interval = 1 hour and the period is 1 day is obtained by the following (Formula 2).

  Moreover, the average load factor in the case of FIG. 3 is calculated | required by the following (Formula 3).

[Equation 2]

Next, a process for obtaining a change in loss due to transformer update from the load factor will be described with reference to FIGS.
FIG. 4 is a graph illustrating a case where the load factor is calculated from the amount of active power for one hour in consideration of the power factor.
FIG. 5 is a graph for explaining the case where the load factor is calculated from the current at a predetermined sampling interval.
FIG. 6 is a flowchart showing a process for obtaining the difference between the loss before and after the transformer update from the equivalent load factor.

  As a first method for obtaining the load factor, the power measuring device 30 collects the active power amount and the power factor, and obtains the result. Here, as shown in FIG. 4, the active power amount is an active power amount for one hour.

  A second method for obtaining the load factor is a method in which the power measuring device 30 collects current at a predetermined sampling interval and obtains it.

  As shown in FIG. 5, the current is obtained from the viewpoint of the load factor, which is the original method, but the sampling interval is limited, so it is positioned as a simple method compared to the first method. It becomes.

  Next, the process for obtaining the difference between the loss before and after the transformer update will be described with reference to FIG.

  First, the updated equivalent load factor of the transformer is obtained by the method described above (S01) according to the following (formula 4). In addition, the load factor before update may be given from the outside, or may be measured and obtained by the method described above.

[Equation 3]

  Here, Pe is the equivalent load factor to be obtained, and Pi is the load factor in the section i or the i-th load factor for sampling, and it is assumed that there are N pieces. For example, in the above example, Pi is a load factor in an interval of 1 hour, and since the period is 1 day, N = 24.

  Next, the updated transformer total loss W1 [kW] is calculated from the equivalent load factor by the following (Equation 5) (S02).

W1 = {no load loss [W] + load loss [W] × (equivalent load factor) ² } / 1000 × N
... (Formula 5)
Next, the total loss W2 [kW] of the transformer before the update is calculated from the equivalent load factor by the following (Equation 6) (S03).

W2 = {no load loss [W] + load loss [W] × (equivalent load factor) ² } / 1000 × N
... (Formula 6)
Next, the reduction loss ΔW [kW] before and after the renewal of the transformer is obtained by the following (Equation 7) (S04).

ΔW = W2−W1 (Expression 7)
Then, the reduction loss ΔW [kW] is displayed on a graph or a form (S05).

Next, the example which displays the effect of energy saving by updating a transformer using FIG.7 and FIG.8 is demonstrated.
FIG. 7 is a graph showing the transformer loss before and after the update when the load factor is changed.
FIG. 8 is a graph showing the reduction loss when the load factor is changed.

  As shown in FIG. 7, the loss of the transformer is represented by a graph of a quadratic function with respect to the load factor. The loss when the load factor = 0% is a no-load loss (iron loss) that is a loss that occurs even when no load is applied. In order to suppress this, it is necessary to use a material with little loss for the iron core of the transformer, and in an amorphous transformer using amorphous for the iron core of the transformer, this no-load loss can be suppressed to the maximum.

  When the load factor is 100%, the load loss (copper loss) is maximized, and the transformer loss is also maximized.

  The reduction loss ΔW before and after the renewal of the transformer is as shown in FIG.

The difference w2 in loss when the load factor = 0% is the largest, and then decreases to the difference w1 in loss when the load factor = 100 % by drawing a quadratic curve.

  If this is displayed on the display device 111 of the system, the user can visually grasp the energy saving effect.

  Next, the 2nd electric power evaluation method by the electric power evaluation system of the transformer which concerns on one Embodiment of this invention using FIG. 9 and FIG. 11 is demonstrated.

  FIG. 9 is a graph showing a change in the effect of the energy saving amount per unit time.

  FIG. 10 is a graph for comparing the comparison with the energy saving amount for the contract when the transformer is updated.

  FIG. 11 is a graph showing the cumulative effect of energy saving.

As shown in FIG. 9, the display device 111 displays the change in the consumed ( loss ) power amount (energy saving amount) saved per unit time when the transformer is updated. Thereby, the merit by introduction of a transformer can be grasped directly visually. The power consumption ( loss ) power of the transformer before the update may be obtained by using the data shown in FIG. 1 or by catalog specifications.

In addition, when the transformer is introduced, if there is an energy saving amount contract with the customer, the energy saving amount in the change of time is displayed as shown in FIG. The energy saving amount is executed by the charge conversion program 144 based on the collected power consumption ( loss ) data. It is assumed that the energy saving amount with the customer is P [yen].

  Furthermore, as shown in FIG. 11, by showing the cumulative amount of energy saving by introducing a transformer, the customer can visually grasp the merit of introducing a new type of transformer with high energy saving effect.

  DESCRIPTION OF SYMBOLS 00 ... Power supply, 10 ... Transformer, 20 ... Load, 30 ... Electric power measuring device, 40 ... IF unit, 100 ... Computer, 111 ... Display apparatus, 121 ... Keyboard, 122 ... Mouse, 140 ... HDD

Claims (6)

In the method for calculating the energy saving effect of the transformer for evaluating the loss of the transformer with respect to the load when the transformer is interposed between the load and the power supply to supply power,
Electric power measurement device collects electrical data for load,
A computer connected to the power measurement device and receiving electrical data collected by the power measurement device;
The computer receives the electrical data at the time of operation of the updated transformer from the power measuring device every predetermined time, and calculates the load factor of the updated transformer every predetermined time based on the electrical data. calculated, calculates an equivalent load factor for each predetermined time period from a plurality of values of the load factor per the predetermined time, based on the equivalent load factor and the load loss and no-load loss, the predetermined transformers loss after update obtained by continuously calculating for each period, also on the basis of the previously obtained pre-update transformer negative Nison and no-load loss of the data and the previous SL equivalent load factor, the loss of the transformer before the update And continuously calculating the difference between the loss of the transformer before the update and the loss of the transformer after the update as a reduced loss. Energy saving effect calculation method.   2. The energy saving effect calculation method for a transformer according to claim 1, wherein the electrical data is an active power, a power factor, or a current.  The method for calculating the energy saving effect of a transformer according to claim 1, wherein the loss of the transformer before the update for each load factor and the loss of the transformer after the update are displayed on the display device in a comparison form.   2. The display unit displays the consumption (loss) power amount of the transformer before the update per unit time in a format for comparing the consumption (loss) power amount of the transformer after the update. Of energy saving effect of transformers in Japan.   Transformer consumption (loss) power consumption before the update and the energy saving amount calculated from the transformer power consumption (loss) power amount after the update, or the amount compared to the contract energy saving amount or amount in the display device 2. The energy saving effect calculation method for a transformer according to claim 1, wherein the energy saving effect is displayed.   It is necessary to display on the display device the amount of energy consumed or lost before the update, and the cumulative energy saving amount or amount over time determined from the power consumption (loss) of the transformer after the update. 2. The energy saving effect calculation method for a transformer according to claim 1, wherein the energy saving effect is calculated.

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