Qingdao Huabeier Microelectronics Studio
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table of Contents
Chapter 1 Overview
Chapter 2, HBR-A Energy Control Type Power Saver Motor
Chapter III, HBR-A Energy Control Power Saver Technology Function
Chapter IV, HBR-A type energy-controlled power saver automatic protection function
Chapter 5, main technical parameters of HBR-A energy-controlled power saver, the first section, the main rated technical parameters, the second section, the use of the installation technical parameters, the third section, the nameplate of the HBR-A energy-controlled power saver
Chapter VI, HBR-A Energy Control Type Power Saver Rated Power Application Selection
Chapter VII, HBR-A Energy-Controlled Power Saver Application Range Section 1, HBR-A Energy-Controlled Power Saver, Scope 2, HBR-A Energy-Controlled Power Saver, Disabled Range
Chapter VIII, HBR-A Energy-Controlled Power Saver Installation and Wiring Method Section 1, Installation and Wiring Technical Principles Section 2, Installation and Wiring Mode Section III, Installation and Wiring Precautions
Chapter IX, Distribution of Power Saving Benefits
Chapter 10, HBR-A energy-controlled power saver, power saving power measurement method, first section, measurement location determination, second section, measurement method 1, electric energy comprehensive analysis tester, two-watt meter measurement, two-phase electric power Table measurement:
3, using voltmeter, ammeter measurement 4, using a clamp-type ammeter measurement
Chapter XI, Calculation of Power Saving Benefits 1:
Three-phase asynchronous motor power saving benefit: $ motor annual section calculation The first type: According to the data recorded by the two-watt meter, the following physical quantities are calculated separately.
Second: The recorded electrical energy is measured according to the three-phase watt-hour meter, and the physical quantity is calculated separately.
The third type: according to ammeter, voltmeter, clamp ammeter. The recorded electrical energy is measured, and the following physical quantities are calculated separately.
Chapter 12, Calculation of Power Saving Benefits 2:
Transformer secondary coil resistance power saving benefit: $ variable resistance annual section calculation first section, determine the exact value of known physical quantity second section, calculation steps
Chapter XIII, Calculation of Power Saving Benefits III:
Power saving benefits of transmission lines: The first section of the calculation of transmission year: Section 2 of the transmission line: Distribution of power saving benefits of transmission lines Section III: Determination of the exact value of the following physical quantities Section IV: Actual calculations, steps
Chapter Fourteen, the calculation of power saving benefits four:
Chapter fifteenth, installation of HBR-A energy-controlled power saver investment payback period calculation:
Chapter 16, Product Series Specifications, Prices, Warranty and Technical Services
Chapter 17: Technical Analysis of Common Application with Speed ​​Control Devices
Chapter 18, Technical Function Application Demonstration Case Analysis
Chapter 19, matters needing attention
Chapter 20, Appendix
HBR-A energy-controlled power saver for three-phase asynchronous motor (small and medium)
The first chapter, overview According to the statistics of the national authorities, China's large, medium and small three-phase asynchronous motors have been developed to more than 200 series, more than 10,000 specifications. The total installed capacity exceeds 300 million Kw, and the electricity consumption accounts for 60%-70% of the total power generation in the country.
In the internal power supply network of the enterprise, due to the large number of applications of three-phase asynchronous motors. The power consumption of three-phase asynchronous motors has exceeded 70% of the total electricity consumption of enterprises. Some companies have reached more than 95%.
With the rapid development of industry, in the early ten years of this century. The installed capacity of three-phase asynchronous motors, the annual increase in proportion, will exceed the annual increase rate at the end of the 20th century. In particular, the installed capacity of large three-phase asynchronous motors will increase significantly each year.
The second chapter, HBR-A type energy-controlled power saver section motor HBR-A type energy-controlled power saver, and three-phase asynchronous motor work together, through the energy control technology. Realize three-phase asynchronous motor: the current actual output power is unchanged; or the current actual output power matches the load.
* Reduce the input electric power of the three-phase asynchronous motor.
* Reduce the total line current in the transmission line.
* Reduce the electrical power delivered in the transmission line.
The third chapter, HBR-A energy-controlled power saver technology function HBR-A energy-controlled power saver, technical functions mainly have the following 12 aspects.
1. Reduce the input electric power of the three-phase asynchronous motor 2. Reduce the total line current in the transmission line. 3. Reduce the electric power transmitted in the transmission line. 4. Reduce the electric loss power of the transmission line: P transmission loss:
Namely: P transmission loss = P conductor loss + P contact loss 5, reduce the electrical loss power of the transformer secondary coil copper resistance: P to copper loss.
6. Reduce the voltage drop on the transmission line, increase the terminal voltage of the three-phase asynchronous motor, improve its operating condition, and increase the output power.
7. Reduce the load on the blade, switch, fuse, contactor contact, extend the service life, and reduce maintenance and replacement costs.
8. Improve the power factor of the internal power supply network of the enterprise and avoid the power rate adjustment fee.
9. Increase the transmission capacity of the transmission line and increase the power supply capacity.
10. Increase the power supply capacity of the transformer.
11. Improve the operating condition of the three-phase asynchronous motor and the speed regulating device, and further improve the energy saving effect.
12. Absorb harmonics, purify the internal power supply network of the enterprise, and improve the quality of power supply.
Chapter 4, HBR-A energy-controlled power saver automatic protection function HBR-A energy-controlled power saver, designed with over-voltage and fault automatic detection, fully automatic protection.
When the following situations occur, it will automatically cut off the grid and will not affect the normal operation of the internal power supply network.
1. The voltage of the internal power supply network of the enterprise exceeds the rated voltage by 1.1 times;
2. When the internal power supply network of the enterprise generates large inrush current and harmonic interference is serious;
3, HBR-A energy-controlled power saver, when it is faulty.
Chapter 5, main technical parameters of HBR-A energy-controlled power saver
Section 1, main rated technical parameters 1, rated power PN:
HBR-A energy-controlled power saver rated power, according to J, JQ, Y series, 2, 4, 6, 8 pole specifications, three-phase asynchronous motor rated power. The design is shaped to match the serialized product.
Please select according to "Chapter 6, HBR-A Energy Control Type Power Saver Rated Power Application Selection", "Chapter 16, Product Series Specifications, Price, Quality Assurance and Technical Service".
2. Rated voltage UN: three-phase alternating current, 0.38Kv, 50Hz.
3, rated power saving equivalent: 5% - 20%.
In practice, the technical parameters of the three-phase asynchronous motor rated parameters, operating conditions, and the internal power supply network status of the enterprise are different. Actual power saving equivalents vary.
4. Rated life: Under normal working conditions: 10 years.
5, running quota: continuous online operation.
Section 2, use installation technical parameters 1, installation location altitude: <3000 meters.
2. Installation site ambient temperature: -40 degrees - ten 55 degrees.
3. Relative humidity of installation location: <85%.
4. There is no conductive dust and no corrosive gas at the installation site.
5. There is no explosive or flammable danger at the installation site, and there is no high temperature heat source.
6. There is no severe vibration and no waves at the installation site.
7. It is required to be installed in an environment with conductive dust, corrosive gas, high temperature heat source, explosive, flammable, severe vibration and wave. Products with special performance should be selected.
Section III, Nameplate of HBR-A Energy-Controlled Power Saver Each HBR-A energy-controlled power saver has a nameplate. Indicate the type, rating and related technical parameters of the power saver.
Nameplate model:
Model Description:
l Specification code: divided into two parts. Part 1 is a number indicating the number of poles of the motor that the Power Saver applies to, such as 2, 4, 6, and 8. Part 2, 2-4 digits, indicates rated power.
l Enterprise code: 3 English letters: HBR-Hubell abbreviation.
l Product code: 2-3 English letters: The first letter J, indicating the power saver. The 2-3th letters, such as J, JQ, J2, JQ2, Y, Y2. Indicates the motor series to which the power saver is applied.
Example: JJQ2-HBR-4-75,
Said: Huabei JQ2 series, 4 pole, 75Kw, three-phase asynchronous motor power saver.
Chapter VI, HBR-A Energy Control Type Power Saver Rated Power Application Select HBR-A Energy Control Type Power Saver, Rated Power Application Selection Method:
According to the nameplate of the three-phase asynchronous motor, marked:
The series model rated voltage rated power is extremely logarithmic with four technical parameters. Select the HBR-A energy-controlled power saver that corresponds to it.
Chapter VII, HBR-A energy-controlled power saver application range
The first section, HBR-A energy-controlled power saver, the scope of application:
1. Three-phase asynchronous motor suitable for dragging small and medium power fans;
2. Three-phase asynchronous motor suitable for dragging small and medium power pumps;
3. Three-phase asynchronous motor suitable for dragging small and medium power punching machines;
4. Three-phase asynchronous motor suitable for dragging small and medium power presses;
5. Three-phase asynchronous motor suitable for dragging small and medium power machine tools;
6. Three-phase asynchronous motor suitable for dragging small and medium-sized power injection molding machines;
7. Three-phase asynchronous motor suitable for dragging small and medium-sized power plastic extruders;
8. Three-phase asynchronous motor suitable for dragging small and medium power textile machines;
9. Three-phase asynchronous motor suitable for dragging small and medium power spinning (yarn) machine;
10. Three-phase asynchronous motor suitable for dragging small and medium power belt conveyors;
11. Three-phase asynchronous motor suitable for dragging small and medium-sized power material crushers, crushers and ball mills;
12. Three-phase asynchronous motor suitable for dragging small and medium power material mixers.
Description: A power saver for large three-phase asynchronous motors that needs to be applied to the above range. Please choose: HBR-B energy control type power saver.
For power savers that need to be applied to single-phase asynchronous motors, please use: HBR-C energy-controlled power saver.
Section 2, HBR-A energy-controlled power saver, prohibited range:
1. Three-phase asynchronous motor for driving the elevator is prohibited;
2. Three-phase asynchronous motor for dragging the lift is prohibited;
3. Three-phase asynchronous motors for dragging all kinds of cranes are prohibited;
4. Three-phase asynchronous motors for various types of frequent starting are prohibited.
Chapter VIII, HBR-A Energy-Controlled Power Saver Installation and Wiring Mode In actual production, three-phase asynchronous motors have many starting methods, and some are more complicated. Therefore, the installation and wiring methods of the HBR-A energy-controlled power saver are also various.
Please analyze the actual technical methods according to the following technical principles to determine the actual wiring method.
The first section, the technical principle of installation wiring:
HBR-A energy-controlled power saver, and three-phase asynchronous motor, the technical principle of installation and connection:
1. HBR-A energy-controlled power saver and three-phase asynchronous motor terminal block should be directly connected in parallel. There should be no current limiting components such as fuses, circuit breakers, and thermal protectors in the middle. Ensure that the HBR-A energy-controlled power saver, together with the three-phase asynchronous motor, becomes a powered device that is connected or disconnected from the power supply.
2. After installing the HBR-A energy-controlled power saver. HBR-A energy-controlled power saver power supply side, current limiting fuses, circuit breakers, thermal protectors, etc., current limiting protection components; or newly installed fuses, circuit breakers, thermal protectors, etc., current limiting protection element When the device is.
Since the total current of the line has been reduced, it should be based on the total current value of the line after the reduction. To adjust or select fuses, circuit breakers, thermal protectors, etc., current limiting values ​​of current limiting protection components.
3. For the three-phase asynchronous motor with Y-â–³ starter, install HBR-A energy-controlled power saver. Be sure to connect correctly according to the method described in the second section of this chapter, "Installation Wiring Method: Item 5."
4. It is forbidden to install the HBR-A energy-controlled power saver in a three-phase asynchronous motor that is frequently started.
5. Install the three-phase asynchronous motor of HBR-A energy-controlled power saver. The interval between continuous starting should be no less than 3 minutes.
6. For the HBR-A type energy-controlled power saver, and the three-phase asynchronous motor. Through the control device, when the power is connected and disconnected asynchronously. Should guarantee:
When connecting: The three-phase asynchronous motor is started first, and then the HBR-A energy-controlled power saver is connected with it.
When disconnected: After the three-phase asynchronous motor is powered off for 3 minutes, the HBR-A energy-controlled power saver is disconnected.
The second section, installation wiring mode HBR-A energy-controlled power saver, and three-phase asynchronous motor wiring. According to the three-phase asynchronous motor, different starting methods, different protection methods, and different protection devices. There are several common types:
1. Directly started three-phase asynchronous motor HBR-A energy-controlled power saver can be directly connected to the terminal of the three-phase asynchronous motor. With the three-phase asynchronous motor, the same knife switch is shared.
Since the total current of the line is reduced, the rated current of the fuse should be adjusted.
The wiring diagram is as follows:
2. The three-phase asynchronous motor HBR-A energy-controlled power saver with thermal protector installed is directly connected to the terminal of the three-phase asynchronous motor. Since the total current of the line is reduced, the setting current value of the thermal protector and the rated current value of the fuse should be adjusted. The wiring diagram is as follows:
3. Three-phase asynchronous motor with newly installed thermal protector For the three-phase asynchronous motor that was originally started directly, when the HBR-A type energy-controlled power saver is installed, the thermal protector is installed. The HBR-A energy-controlled power saver should be directly connected in parallel to the terminals of the three-phase asynchronous motor. The same knife switch and the same thermal protector are shared with the three-phase asynchronous motor.
The total current through the line flowing through the knife switch, fuse and thermal protector is reduced. Rated current value of the knife switch, fuse and thermal protector. It should be selected with reference to the total current value of the line after installing the HBR-A type compensation type power saver.
The wiring diagram is as follows:
4. HBR-A energy-controlled power saver, installed at the lower end of the control cabinet circuit breaker. If the three-phase asynchronous motor is on site, the HBR-A energy-controlled power saver cannot be installed. The HBR-A energy-controlled power saver can be installed at the lower end of the control cabinet circuit breaker.
The HBR-A energy-controlled power saver shares the same circuit breaker with a three-phase asynchronous motor. Since the total current flowing through the circuit breaker is reduced, the rated current value of the circuit breaker should be adjusted according to the reduced current value.
In the HBR-A energy-controlled power saver, and the three-phase asynchronous motor. Current limiting components such as fuses, circuit breakers, and thermal protectors should not be connected.
The wiring diagram is as follows:
5. Three-phase asynchronous motor with Y-â–³ starter For the three-phase asynchronous motor with Y-â–³ starter, HBR-A energy-controlled power saver is installed.
Since starting, the three-phase asynchronous motor is a Y-connection. When running after starting, the three-phase asynchronous motor is a delta type connection.
In the wiring, it must be ensured that during the starting process of the three-phase asynchronous motor, the three terminals V2, U2 and W2 connected with the HBR-A energy-controlled power saver are guaranteed to be short-circuited. That is: it becomes the neutral point of the Y-connection.
Special note: HBR-A energy-controlled power saver, if connected to the V1, U1, W1 terminals of the three-phase asynchronous motor winding, is the wrong connection method. Or connected to the power supply side of the Y-Δ starter is also the wrong connection method. Both will damage the three-phase asynchronous motor and the HBR-A energy-controlled power saver. The wiring diagram is as follows:
Section III, Installation and Wiring Notes 1. HBR-A energy-controlled power saver. When installing: Connect the copper wire with the three-phase asynchronous motor and the rated current.
2. HBR-A energy-controlled power saver, when installing: its terminal should not be exposed, it should meet the safety requirements of electrical installation.
3. HBR-A energy-controlled power saver, when disassembling: Do not touch the terminal block within 3 minutes after power failure.
Chapter IX, three-phase asynchronous motor with power-saving benefit distribution, after installing HBR-A energy-controlled power saver. In the internal power supply network of the enterprise, 12 aspects of power saving function and power saving benefit are generated.
Therefore, there are many contents and methods for calculating the power saving function and the power saving benefit. In actual production, the actual factors such as the content to be calculated, the instrument to be used, and the metering and charging method should be correctly calculated.
Among them, the three-phase asynchronous motor is installed after the HBR-A energy-controlled power saver. The directly generated power saving benefits are mainly in the following three aspects.
which is:
l Three-phase asynchronous motor input electric power reduction: P motor drop l Transformer secondary coil resistance electric loss power reduction: P variable resistance loss l Transmission line electric loss power reduction: P transmission loss
Therefore, the three-phase asynchronous motor is installed after the HBR-A type energy-controlled power saver. The directly generated power saving power P total power saving, and the total power saving of the power saving W year are the sum of the above three aspects.
u P total power saving = P motor drop + P variable resistance loss + P transmission loss u W annual total power saving = W motor year + W variable resistance year + W transmission year directly generated electricity saving benefit: $ annual total electricity saving It is also the sum of the above three aspects.
$year total power saving = $ motor year + $ variable resistance year + $ transmission year
Chapter 10, HBR-A energy-controlled power saver, the power-saving power measurement method correctly measures the electric power saved after installing the HBR-A energy-controlled power saver. Into, calculate the saved energy and save electricity costs. It is a key issue in the selection of HBR-A energy-controlled power saver.
Therefore, the correct measurement location and measurement method should be determined first.
The first section, the measurement location, determines whether the HBR-A energy-controlled power saver is installed, either the wiring method or the measuring instrument. The measurement location should be selected on the power side of the HBR-A energy-controlled power saver.
The measurement location was selected: HBR-A energy-controlled power saver, and the three-phase asynchronous motor is wrong.
The second section, measurement method In the actual production, power supply measurement and measurement instruments, commonly used are: electric energy comprehensive analysis tester, three-phase watt-hour meter, ammeter, voltmeter, clamp-type ammeter.
For three-phase asynchronous motors, the meters used for metering and charging are different, the wiring methods are different, and the charging calculation methods are also different.
Three-phase asynchronous motor, measuring method of power saving effect. It should correspond to the meter, wiring method and charging calculation method used for metering and charging. In order to ensure the correctness of the power saving effect measurement.
According to the actual production, the three-phase asynchronous motor is generally powered by a three-phase three-wire power supply, with a line voltage of 380V and a Δ connection. Three-phase asynchronous motor, the method of measuring the power saving effect, exemplifies the following four common types:
1. Using the electric energy comprehensive analysis tester to measure two watts:
(1), two watt meter wiring:
For three-phase three-wire power supply, the two-watt meter is wired as follows:
l Put three voltage test clips of yellow, green and black on the A, B and C phase lines.
l Insert the yellow and green clamp current transformers into the A and B phase lines respectively. It should be noted that the center arrow mark on the inside of the jaws of the clamp current transformer should be directed to the power supply side.
l The introduction of the two-watt meter power supply: the red voltage test clip is connected to the power supply neutral line.
(2) Physical quantity measured:
After the wiring is completed, it can be measured: before and after the HBR-A energy-controlled power saver is installed. On the three-phase asynchronous motor terminal block:
Line line voltage value line total current value active power value reactive power value power factor value (3), measurement method and precautions:
u When measuring: Try to make the three-phase asynchronous motor before and after the HBR-A energy-controlled power saver is installed. The power supply voltage, load status, and running time are basically the same.
u Due to the actual production, the three-phase asynchronous motor is installed before and after the HBR-A energy-controlled power saver. Its supply voltage, load status, and running time will fluctuate.
Therefore, a measurement time unit should be designed. The measurement time unit segment is divided into several measurement moments. The values ​​of each measurement time are recorded separately, and then the average value is taken.
When calculating the average value, a maximum value and a minimum value should be removed to ensure the accuracy of the average value calculation. Improve the accuracy of power saving measurement.
u The design of the measurement time unit can be divided into two cases:
The first case: The measurement time unit is designed to be 24 hours and divided into 48 measurement moments. The measurement is recorded once every 30 minutes, and then the average value is taken.
The second case: the measurement time unit is designed to be 2 hours, divided into 24 measurement moments. The measurement is recorded every 5 minutes and then averaged.
2. Measurement by three-phase watt-hour meter:
(1), three-phase watt-hour meter wiring:
According to the electrical technical specifications, a three-phase watt-hour meter is connected to the three-phase three-wire system.
(2) Physical quantity measured:
u Measurement record: Before the installation of HBR-A energy-controlled power saver, the three-phase asynchronous motor, the power consumption in the unit of measurement time.
u Measurement record: After the HBR-A energy-controlled power saver is installed, the three-phase asynchronous motor is used for the power consumption in the unit of measurement time.
(3), measurement methods and matters needing attention:
u When measuring: Try to make the three-phase asynchronous motor before and after the HBR-A energy-controlled power saver is installed. The power supply voltage, load status, and running time are basically the same.
u Due to the actual production, three-phase asynchronous motor, before and after the installation of HBR-A energy-controlled power saver, its supply voltage, load status and running time will fluctuate. Therefore, a measurement time unit should be designed.
u The design of the measurement time unit can be divided into two cases:
The first case: When the three-phase asynchronous motor is running 24 hours a day, it should be no less than 30 working days.
The second case: three-phase asynchronous motor, running less than 16 hours per day, should be no less than 60 working days.
3, using voltmeter, ammeter measurement:
(1), voltmeter, ammeter wiring:
According to the electrical technical specifications, on the three-phase three-wire system, the voltmeter and ammeter are connected.
(2) Physical quantity measured:
Measurement record: HBR-A energy-controlled power saver before and after installation. On the three-phase asynchronous motor terminal block:
Line line voltage value line total current value (3), measurement methods and matters needing attention:
u When measuring: Try to make the three-phase asynchronous motor before and after the HBR-A energy-controlled power saver is installed. The power supply voltage, load status, and running time are basically the same.
u Due to the actual production, the three-phase asynchronous motor is installed before and after the HBR-A energy-controlled power saver. Its supply voltage, load status, and running time will fluctuate.
Therefore, the unit of measurement time should be divided into several measurement moments. The values ​​of each measurement time are recorded separately, and then the average value is taken.
When calculating the average value, a maximum value and a minimum value should be removed to ensure the accuracy of the average value calculation. Improve the accuracy of power saving measurement.
u The design of the measurement time unit can be divided into two cases:
The first case: The measurement time unit is designed to be 24 hours and divided into 48 measurement moments. The measurement is recorded once every 30 minutes, and then the average value is taken.
The second case: the measurement time unit is designed to be 2 hours, divided into 24 measurement moments. The measurement is recorded every 5 minutes and then averaged.
4, using a clamp-type ammeter measurement:
(1), clamp ammeter wiring:
According to the electrical technical specifications, on the three-phase three-wire line, clamp the current meter to the A phase line.
(2) Physical quantity measured:
Measurement record: HBR-A energy-controlled power saver before and after installation. On the three-phase asynchronous motor terminal block:
Total line current value (3), measurement method and precautions:
u When measuring: Try to make the three-phase asynchronous motor before and after the HBR-A energy-controlled power saver is installed. The power supply voltage, load status, and running time are basically the same.
u Due to the actual production, the three-phase asynchronous motor is installed before and after the HBR-A energy-controlled power saver. Its supply voltage, load status, and running time will fluctuate.
Therefore, the unit of measurement time should be divided into several measurement moments. The values ​​of each measurement time are recorded separately, and then the average value is taken.
When calculating the average value, a maximum value and a minimum value should be removed to ensure the accuracy of the average value calculation. Improve the accuracy of power saving measurement.
u The design of the measurement time unit can be divided into two cases:
The first case: The measurement time unit is designed to be 24 hours and divided into 48 measurement moments. The measurement is recorded once every 30 minutes, and then the average value is taken.
The second case: the measurement time unit is designed to be 2 hours, divided into 24 measurement moments. The measurement is recorded every 5 minutes and then averaged.
Chapter XI, Calculation of Power Saving Benefits 1:
Three-phase asynchronous motor power saving benefit: $ motor annual section calculation according to the use of different measuring instruments, the data recorded by the test is different, divided into three calculation methods.
The first type: The following physical quantities are calculated separately based on the measured data of the two watt meter.
1. Total line current reduction value: △I total current △I total current = total line current before installation I total current before - total line current after installation I total current 2. Active power reduction value: △P active △P active = Before the installation, the active power P is active before the active power P after the installation. 3, the reactive power reduction value: △P reactive power △P reactive = before the installation of reactive power P reactive power - after the installation of reactive power P reactive After 4, three-phase asynchronous motor input electric power reduction value: P motor drop P motor drop = (△ I total current × line line voltage 380V) × 1.73
5, three-phase asynchronous motor annual energy saving calculation: W motor annual section W motor year = P motor drop × annual running time T hours 6, three-phase asynchronous motor annual electricity saving calculation: $ motor year $ motor Year Festival = W motor year festival × comprehensive electricity price 0.8 yuan / kWh
Second: According to the three-phase watt-hour meter to measure the recorded electrical energy, the following physical quantities are calculated separately.
1. Calculation of the energy consumption of the three-phase asynchronous motor for 1 day before installation: 1 day before the W motor 1 day before the motor = the electric energy recorded before installation W. The number of days before the measurement T is the number of days before the second day, the three-phase asynchronous after installation Motor 1 day power consumption calculation: 1 day after W motor 1 day after motor = measured electric energy recorded after installation W ÷ measurement recorded days T days 3, installed three-phase asynchronous motor 1 day energy saving calculation :
W motor section 1 day W motor section 1 day = W motor 1 day before -W motor 1 day 4, after installation three-phase asynchronous motor energy saving calculation throughout the year:
W motor annual section W motor year section = W motor section 1 day × year of operation days T days 5, after installation three-phase asynchronous motor annual electricity cost calculation:
$ motor year $ motor year section = W motor year section × comprehensive electricity price 0.8 yuan / degree
The third type: according to ammeter, voltmeter, clamp ammeter. The recorded electrical energy is measured, and the following physical quantities are calculated separately.
Example: A factory fan three-phase asynchronous motor, rated power 40Kw. The transmission line is a nominal 30mm2 aluminum cable with an electrical distance of L wire = 300m. Install a matching 40Kw power saver. The actual running time of one year is T hours = 8000 hours. Measured: Before installing the power saver, the total current value of the line I before the total current = 59.8 A; after the installation of the power saver, the total current value of the line I after the total current = 50.2 A.
Knowing the physical quantity value l Before installing the power saver, the total current value of the line: I total current before = 59.8 A
l After installing the power saver, the total current value of the line: I total current = 50.2 A
l Material of the transmission line, nominal wire diameter: aluminum cable 30mm2
l Electrical distance of the transmission line: L wire = 300m
Note: The electrical distance of the transmission line is determined by the method of measuring the distance L in the field. The engineering calculation coefficient K wire = 1.15 should be added.
Namely: electrical distance L wire = L test xK wire l annual actual running time: T hour = 8000 hours l power rating of power PN: 40Kw
Actual calculations and steps:
1. Total line current reduction value: â–³I total current â–³I total current = total line current before installation I total current before - total line current after installation I total current = 59.8 A-50.2 A
=9.6A
2, three-phase asynchronous motor input electric power reduction value: P motor drop P motor drop = (△ I total current × line line voltage 380V)
=9.6A×380V
=3.648Kw
3, three-phase asynchronous motor annual energy saving calculation: W motor annual section W motor year = P motor drop × annual running time T hour = 3.648Kw × 8000 hours = 29184 degrees 4, three-phase asynchronous motor annual savings Electricity cost calculation: $ motor year section motor year section = W motor year section × comprehensive electricity price 0.8 yuan / degree = 29184 degrees × 0.65 yuan / degree = 18969.6 yuan
Chapter 12, Calculation of Power Saving Benefits 2:
Transformer secondary coil resistance power saving benefit: $ variable resistance annual calculation of transformer secondary coil resistance power saving benefit calculation: no matter what kind of instrument is used, it is calculated according to the total line current recorded by the measurement.
The first section, determine the exact value of the known physical quantity l Before installing the power saver, the total current value of the line: I total current before l After installing the power saver, the total current value of the line: I total current after l The secondary coil of the transformer is at a temperature of 20 degrees Resistance value: R change 20 degrees l One year actual running time: T hour
Section 2, Calculation Steps First Step: Calculate the actual ambient temperature resistance value of the transformer secondary coil. Change the actual value. Refer to the relevant technical manual to determine the resistance value of the secondary winding of the transformer at 20 degrees: R is 20 degrees. 2. Calculate the actual ambient temperature resistance value of the transformer secondary coil.
The secondary winding conductor resistance of the transformer is a positive temperature coefficient, and the resistance value increases with the ambient temperature, which is correspondingly improved. Generally, the engineering calculation coefficient K is changed to 1.5.
Namely: R becomes sub-real = R changes 20 degrees × K changes = R changes 20 degrees × 1.5
Step 2: Calculate the electrical resistance power loss of the secondary winding of the transformer before installing the power saver: before the P is changed.
P variable resistance before loss = I2 total current before × R changed to the second step: Calculate the electrical resistance of the secondary winding resistance of the transformer after installing the power saver: P after the resistance loss.
After P variable resistance = I2 total current × R changed to the second step: Calculate the power loss power saved by the secondary winding resistance of the transformer after installing the power saver: P variable resistance loss.
P variable resistance loss = P variable resistance before -P variable resistance after the special note: In the actual engineering calculation, the transformer secondary coil resistance, the saved electrical loss power: P variable resistance loss.
Generally, it can be calculated according to the rated power PN of the HBR-A energy-controlled power saver, taking the engineering calculation coefficient K variable resistance loss.
Namely: P variable resistance loss = PN × K variable resistance loss = 40Kw × 1.0%
=0.4Kw
Note:
K variable resistance drop value: Refer to the following engineering experience values.
Rated power PN: ≥160Kw K variable resistance drop: 0.9%
Rated power PN: ≥110Kw K variable resistance loss: 0.95%
Rated power PN: ≥75Kw K variable resistance drop: 1.0%
Rated power PN: ≥30Kw K variable resistance drop: 1.05%
Rated power PN: ≥10Kw K variable resistance loss: 1.1%
Rated power PN: ≤10Kw K variable resistance loss: 1.15%
Step 5: Calculate the electrical energy loss saved by the secondary winding resistance of the transformer after installation of the power saver: W variable resistance annual section W variable resistance annual section = P variable resistance loss × annual running time T hour = 0.4Kw × 8000 hours = 3200 degrees. Step 6: Calculate the electricity cost of the transformer secondary coil resistance after installation of the power saver: $ variable resistance annual section $ variable resistance year section = W variable resistance year section × comprehensive electricity price 0.65 yuan / degree = 3200 degrees × 0.65 yuan / degree = 2080 yuan
Chapter XIII, Calculation of Power Saving Benefits III:
Power-saving efficiency of transmission lines: Calculating the power-saving efficiency of transmission lines for the year of transmission: No matter what kind of instrument is used, it is calculated according to the total current of the line recorded and measured.
Section 1: Transmission lines The transmission lines that constitute the internal power supply network of an enterprise consist of the following two parts of power components.
which is:
1. Transmission line 2, knife, switch, fuse, contactor contact, terminal block, etc.
Section 2: Three-phase asynchronous motor with power-saving efficiency distribution of transmission line, after installing HBR-A energy-controlled power saver. The power saving benefits directly generated by transmission lines are mainly in the following two aspects.
which is:
1. Transmission line resistance electric loss power reduction: P line resistance loss calculation 2. Knife, switch, fuse, contactor contact, terminal contact resistance, electric loss power reduction: P contact loss calculation, therefore, three-phase asynchronous motor After installing the HBR-A energy-controlled power saver.
The power saving power directly generated by the transmission line: P transmission loss and energy saving: W transmission year, is the sum of the above two aspects.
u P transmission loss = P line resistance loss + P contact loss u W transmission year = W line resistance year + W contact annual section directly generated electricity saving benefit: $ transmission year, is also the above three aspects Sum.
u $Power Years = $Line Years + $ Contact Years
Section 3: Determine the exact value of the following physical quantities. l Before installing the power saver, the total current value of the line: I total current before l After installing the power saver, the total current value of the line: I total current l Material and electrical distance of the transmission line: L Conductor (ie: the actual length from the three-phase asynchronous motor to the transformer) and the nominal wire diameter l The resistance of the transmission wire at a temperature of 20 degrees: R wire 20 degrees l One year actual running time: T hour
Section 4: Actual calculation content, example of steps: ibid.
Knowing the physical quantity value l Before installing the power saver, the total current value of the line: I total current before = 59.8 A
l After installing the power saver, the total current value of the line: I total current = 50.2 A
l Material of the transmission line, nominal wire diameter: aluminum cable 30mm2
l Electrical distance of the transmission line: L wire = 300m
Note: The electrical distance of the transmission line is determined by the method of measuring the distance L in the field. The engineering calculation coefficient K wire = 1.15 should be added.
Namely: electrical distance L wire = L test xK wire l annual actual running time: T hour = 8000 hours l power rating of power PN: 40Kw
Actual calculations and steps:
Since the $1 year of transmission = $ line year + day of contact year, the $ line year and $ contact year are calculated separately.
The first step: calculate the calculation of the $line resistance year, the steps are as follows:
1ã€è®¡ç®—æ¯ç›¸è¾“电导线在温度20度时的电阻值：R导线20度ç»æŸ¥èµ„料，30m㎡，é“电缆，在环境温度20度时，Km电阻值ï¼0.88 ?ï¼Km
R导线20度ï¼0.88 ?ï¼Km × 300m
ï¼0.88 ?ï¼Km ×0.3Km
ï¼0.264 ?
2ã€è®¡ç®—æ¯ç›¸è¾“电导线在环境温度高于20度时的电阻值：
R导线实å•è¾“电导线电阻是æ£æ¸©åº¦ç³»æ•°ï¼Œç”µé˜»å€¼éšçŽ¯å¢ƒæ¸©åº¦æ高，会有相应æ高。å¦å¤–，输电导线的æè´¨æ‚è´¨è¾ƒå¤šï¼Œä¹Ÿå¤§å¤§å¢žåŠ äº†è¾“ç”µå¯¼çº¿çš„ç”µé˜»å€¼ã€‚ç»¼åˆä¸¤æ–¹é¢å› ç´ ï¼Œä¸€èˆ¬å¯å–工程计算系数K导线ï¼1.5。
输电导线，在环境温度高于20度时，
实际电阻值：R导线实å•ï¼R导线20度×K导线ï¼0.264 ?×1.5
ï¼0.396 ?
3ã€è®¡ç®—三相输电导线在环境温度高于20度时的电阻值：
R导线实三ï¼R导线实å•Ã—3
ï¼0.396 ?×3
ï¼1.188?
4ã€è®¡ç®—三相输电导线安装节电器å‰ï¼Œç”µæŸåŠŸçŽ‡ï¼šP线阻æŸå‰P线阻æŸå‰ï¼I2总电æµå‰Ã—R导线实三ï¼59.82 A×1.188?
ï¼4248.3 W
5ã€è®¡ç®—三相输电导线安装节电器åŽï¼Œç”µæŸåŠŸçŽ‡ï¼šP线阻æŸåŽP线阻æŸåŽï¼I2总电æµåŽÃ—R导线实三ï¼50.22 A×1.188?
ï¼2993.8 W
6ã€è®¡ç®—三相输电导线安装节电器åŽï¼ŒèŠ‚电功率：P线阻æŸé™P线阻æŸé™ï¼P线阻æŸå‰ï¼P线阻æŸåŽï¼4248.3 Wï¼2993.8 W
ï¼1254.5W
7ã€è®¡ç®—三相输电导线安装节电器åŽï¼Œå…¨å¹´èŠ‚电能：W线阻年节W线阻年节ï¼P线阻æŸé™Ã—一年实际è¿è¡Œæ—¶é—´Tå°æ—¶ï¼1254.5W×8000å°æ—¶ï¼10036 度8ã€è®¡ç®—三相输电导线安装节电器åŽï¼Œå…¨å¹´èŠ‚电费：＄线阻年节＄线阻年节ï¼W线阻年节×综åˆç”µä»·0.8å…ƒï¼åº¦ï¼10036 度×0.65å…ƒï¼åº¦ï¼6523.4å…ƒ
第二æ¥ï¼šè®¡ç®—＄触点年节计算内容æ¥éª¤å¦‚下：
闸刀ã€å¼€å…³ã€ä¿é™©ä¸ã€æŽ¥è§¦å™¨æŽ¥ç‚¹ã€æŽ¥çº¿ç«¯å接触电阻上的，节电效益计算很时ç¹æ‚。
在实际节电效益计算ä¸ã€‚一般采用工程计算系数n的方法进行计算。
工程计算系数nï¼Œæ ¹æ¤è¾“电导线电气è·ç¦»å¤§å°ï¼Œå’Œé—¸åˆ€ã€å¼€å…³ã€ä¿é™©ä¸ã€æŽ¥è§¦å™¨æŽ¥ç‚¹ã€æŽ¥çº¿ç«¯åç‰ï¼Œç”µåŠ›å…ƒä»¶çš„æ•°é‡ã€æŠ€æœ¯å“è´¨ç‰å› ç´ ã€‚ä¸€èˆ¬å–输电导线电阻节电效益的0.30ï¼0.60。
本例计算å–：nï¼0.45
接触电阻上的节电效益计算如下：
1ã€æŽ¥è§¦ç”µé˜»ä¸Šï¼ŒèŠ‚约的电æŸåŠŸçŽ‡ï¼šP触点æŸé™è®¡ç®—P触点æŸé™ï¼ P线阻æŸé™Ã—n
ï¼1254.5W ×0.45
ï¼0.565 Kw
2ã€æŽ¥è§¦ç”µé˜»ä¸Šï¼Œä¸€å¹´èŠ‚约的电能é‡ï¼šW触点年节计算W触点年节ï¼W线阻年节×n
ï¼10036 度×0.45
ï¼4516.2度3ã€æŽ¥è§¦ç”µé˜»ä¸Šï¼Œä¸€å¹´èŠ‚约的电费：＄触点年节计算＄触点年节ï¼ï¼„线阻年节×n
ï¼6523.4元×0.45
ï¼2935.53å…ƒ
第三æ¥ï¼šè¾“电线路节电效益：＄输电年节计算输电线路节电效益P输电æŸé™ï¼P线阻æŸé™ï¼‹P触点æŸé™ï¼1254.5W＋565 W
ï¼1819.5W
ï¼1.82Kw
W输电年节ï¼W线阻年节＋W触点年节ï¼10036 度＋4516.2度ï¼14562.2度＄输电年节ï¼ï¼„线阻年节＋＄触点年节ï¼6523.4元＋2935.53å…ƒï¼9458.9å…ƒ
第åå››ç« ã€èŠ‚电效益计算四：
三相异æ¥ç”µåŠ¨æœºï¼Œå®‰è£…HBRï¼A型能é‡æŽ§åˆ¶å¼èŠ‚电器åŽã€‚直接产生的：总节电功率：P总节电总节电能：W年总节电总节电效益：＄年总节电计算：
将第åä¸€ç« ã€ç¬¬åäºŒç« ã€ç¬¬åä¸‰ç« è®¡ç®—ç»“æžœã€‚ç›¸åŠ å³å®Œæˆã€‚
which is:
P总节电ï¼P电动机é™ï¼‹På˜é˜»æŸé™ï¼‹P输电æŸé™ï¼3.648Kw＋0.4Kw＋1.82Kw
ï¼5.868Kw
W年总节电ï¼W电动机年节＋Wå˜é˜»å¹´èŠ‚＋W输电年节ï¼29184度＋3200度＋14562.2度ï¼46946.2度＄年总节电ï¼ï¼„电动机年节＋＄å˜é˜»å¹´èŠ‚＋＄输电年节ï¼18969.6元＋2080元＋9458.9å…ƒï¼30508.5å…ƒ
第åäº”ç« ã€å®‰è£…HBRï¼A型能é‡æŽ§åˆ¶å¼èŠ‚电器投资回收期计算：
投资回收期ï¼èŠ‚电器投资é¢Ã·ï¼„年总节电（年）
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第åå…«ç« ã€æŠ€æœ¯åŠŸèƒ½åº”用示范案例分æž
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