GB/T 22670-2018 PDF English
US$695.00 · In stock · Download in 9 secondsGB/T 22670-2018: Test procedures for converter-fed three phase cage induction motors Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 22670: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 22670-2018 | English | 695 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Test procedures for converter-fed three phase cage induction motors
| Valid |
| GB/T 22670-2008 | English | 395 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Test procedures for converter-fed three phase cage induction motors
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 22670-2018
GB/T 22670-2018: Test procedures for converter-fed three phase cage induction motors---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT22670-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.160.30
K 22
Replacing GB/T 22670-2008
Test procedures for converter-fed three phase cage
induction motors
Issued on. SEPTEMBER 17, 2018
Implemented on. APRIL 01, 2019
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 5
1 Scope... 6
2 Normative references... 6
3 Terms, definitions and symbols... 7
4 Test requirements... 12
5 Test preparation... 17
6 No-load test... 22
7 Locked-rotor test... 25
8 Load test... 28
9 Determination of loss... 31
10 Determination of efficiency... 35
11 Thermal test... 39
12 Determination of maximum torque... 52
13 Determination of minimum torque... 56
14 Other tests... 58
Appendix A (Normative) Correction method of instrument loss and error... 66
Appendix B (Normative) Correction of dynamometer’s torque reading... 72
Appendix C (Informative) Measurement of slip rate of induction motor... 74
Appendix D (Informative) Linear regression analysis... 76
Appendix E (Informative) Output voltage of converter for test... 78
1 Scope
This standard specifies the test requirements, pre-test preparation, no-load test,
locked-rotor test, load test, determination of loss and efficiency, thermal test,
maximum torque and minimum torque test for converter-fed three-phase cage
induction motors.
This standard applies to converter-fed three-phase cage induction motors.
This standard does not apply to traction motors.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 755-2008 Rating and performance of rotating motor
GB/T 1032-2012 Test procedures for three-phase induction motors
GB/T 10068-2008 Mechanical vibration of certain machines with shaft
heights 56 mm and higher - Measurement, evaluation and limits of vibration
severity
GB/T 10069.1-2006 Measurement of airborne noise emitted by rotating
electrical machines and the noise limits - Part 1.Method for the
measurement of airborne noise emitted by rotating electrical machines
GB/T 18039.4-2017 Electromagnetic compatibility - Environment -
Compatibility levels in industrial plants for low-frequency conducted
disturbances
GB/T 21211-2017 Equivalent loading and superposition techniques - Indirect
testing to determine temperature rise of rotating electrical machines
3 Terms, definitions and symbols
3.1 Terms and definitions
The terms and definitions as defined in GB/T 755-2008, GB/T 1032-2012, GB/T
32877-2016 as well as the following terms and definitions apply to this document.
3.2 Symbols
The following symbols and units apply to this document.
cosφ - Power factor.
f - Frequency, in hertz (Hz).
fN - Rated frequency of the motor, in hertz (Hz).
fr - The maximum frequency of the measuring device, in hertz (Hz).
fsw - Switching frequency, in Hertz (Hz).
fMot - The fundamental frequency of the motor, in Hertz (Hz).
I - Stator line current, in ampere (A).
I0 - No-load line current, in ampere (A).
IK - Current of the locked-rotor line, in amperes (A).
IN - Rated current, in ampere (A).
K1 - The reciprocal of the temperature coefficient of resistance of the
conductor material at 0 °C.
4 Test requirements
4.1 Test power supply
4.1.1 Sine wave test power supply
According to the requirements specified in 4.2 of GB/T 1032-2012.
4.1.2 Converter power supply
The performance of the motor is closely related to the characteristics of the
converter.
The motor shall be powered by a suitable frequency converter and be tested
under the same carrier frequency.
4.2 Measuring instruments
For AC motors, unless otherwise specified in this standard, it shall use the
arithmetic average of the three-phase line current and line voltage.
4.3 Setting of the converter
4.3.1 Overview
For the test converter used in all test methods, the converter parameters shall
be set according to the requirements of this standard. If a combination of a
specific frequency converter and a motor is used in the test, for this specific
application, the parameters of the frequency converter shall be set according to
the specific application. The selected parameter settings shall be recorded in
the test report.
4.4 Measurement requirements
4.4.1 Voltage measurement
The signal wire of the measuring terminal voltage shall be connected to the
motor terminal. If this connection is not allowed on site, the error caused by this
shall be calculated and the reading shall be corrected. Take the arithmetic
average of the three-phase voltage to calculate the motor performance.
4.4.4 Torque measurement
The load test shall be carried out with a torque measuring instrument of
appropriate specifications.
In addition to the locked-rotor test, the measurement of the maximum torque
and the minimum torque, the torque sensor has at least 0.2 accuracy level; the
minimum torque measured shall not be less than 10% of the nominal torque of
the torque sensor. The higher the accuracy level of the sensor, the
corresponding expansion of the allowable torque range.
4.4.5 Measurement of speed and frequency
The instrument for measuring frequency shall have an accuracy of ±0.1% of full
scale. The accuracy of the speed measuring instrument shall be within 0.1 r/min.
4.4.6 Operating procedures
In any test, when reading a series of gradually increasing or decreasing data, it
shall be noted that the sequence of operations of increasing or decreasing shall
not be changed, to avoid reversing the direction of the test.
4.4.7 Safety
Due to the dangerous current, voltage and mechanical force involved, safety
precautions shall be taken for all tests. All tests shall be performed by personnel
with relevant knowledge and experience.
4.4.8 Anti-interference measures
The influence of the interference radiation of the converter on the measurement
shall be fully considered during the test. Anti-interference measures shall be
taken in the installation of the converter, the selection of test cables, the
selection of measuring instruments, the power isolation of the measuring
instruments, the system grounding, etc.
5 Test preparation
5.1 Determination of insulation resistance
5.1.1 State of the motor during measurement
When measuring the insulation resistance of the motor windings, it shall be
carried out in the actual cold state and in the hot state (after the thermal test).
During the inspection test, it is allowed to measure in the actual cold state.
5.1.3 Measurement method
When measuring the winding’s insulation resistance, if the beginning and end
of winding at each phase are all lead out, it shall measure the insulation
resistance of each winding to the casing and between the windings, respectively.
At this time, other windings and embedded thermometers and other
components that do not participate in the test shall be electrically connected to
the iron core or casing. The casing shall be grounded. If only three terminals
are lead out from inside the motor for the three-phase windings, it measures
the insulation resistance of all the connected windings to the casing.
5.2 Determination of the DC terminal resistance of the winding in the initial (cold) state
5.2.1 Determination of winding temperature in the initial state
Use a thermometer to measure the winding temperature. The motor shall be
placed indoors for a period of time before the test. The difference between the
winding temperature and the temperature of the cooling medium measured with
a thermometer (or embedded thermometer) shall not exceed 2 K. For large and
medium-sized motors, the thermometer shall be placed for not less than 15
minutes.
5.3 Test resistance
The unit of winding resistance R is ohm, which is measured by an appropriate
method. R represents the terminal resistance of the stator winding. The
resistance measurement at the end of the thermal test shall be the extrapolation
method as described in 8.6.2.3.3 of GB/T 755-2008, using the shortest possible
time instead of the time interval as specified in Table 5 of GB/T 755-2008; then
it is extrapolated to zero.
5.4 Winding temperature
The winding’s test temperature is determined by one of the following methods
(in the order listed).
5.5 Correct to the reference cooling medium temperature
The winding resistance value recorded in the test shall be converted to a
standard reference temperature of 25 °C. Correct the winding resistance (and
the slip rate of the cage induction motor) to the standard reference cooling
medium temperature of 25 °C.
6 No-load test
6.1 Conditions for no-load test
No-load test refers to a test in which the motor runs as a no-load motor and its
shaft end has no effective mechanical power output.
Before reading and recording the test data, the input power of the motor shall
be stable, that is, the difference between two consecutive readings of the input
power 30 min apart shall not be greater than 3% of the previous reading.
For water-air cooling motors, it shall cut off the water source immediately after
the thermal test (or load test).
6.2 Determine no-load current and no-load loss
The test shall test the following 8 voltage points, including the rated voltage points, namely.
6.3 Determine the constant loss PC
The no-load input power minus the stator loss at the test temperature is the
constant loss. The constant loss is the sum of the wind friction loss and iron
loss.
6.4 Determine wind friction loss Pfw
For 4 or more continuous test points in the range of about 60% of rated voltage
to 30% of rated voltage point, make the PC vs. curve (see Figure 2). Extend
this straight line to zero voltage. The intercept on the vertical axis at zero voltage
is the wind friction loss Pfw0 at near synchronous speed.
6.5 Determine the iron loss PFe
For each voltage point between 90% rated voltage and 110% rated voltage,
draw the relationship curve of PFe = PC - Pfw to U0.
7 Locked-rotor test
7.1 Rated frequency locked-rotor test
7.1.1 Determination of locked-rotor current, locked-rotor torque, locked-
rotor power
7.1.2 Calculation of test results
7.1.2.1 Determination of locked-rotor current and locked-rotor torque
If the maximum voltage during the locked-rotor test is within the range of 0.9 ~
1.1 times the rated voltage, the locked-rotor current IKN and the locked-rotor
torque TKN can be checked from the locked-rotor characteristic curve (Figure 3).
If the maximum voltage during the locked-rotor test is lower than 0.9 UN,
7.2 Breakaway torque test under converter power supply
The test frequency and maximum starting current shall be as specified in
accordance with the product standard or the agreement between the
manufacturer and the customer.
8 Load test
8.1 Overview
The purpose of load test is to determine the relationship between motor
efficiency, power factor, speed, stator current, input power, etc. and output
power. The test adopts the direct load method, using suitable equipment (such
as a DC motor for the load motor or a three-phase asynchronous motor for the
load motor, etc.) to load the motor.
8.2 Rated load test
Before the load test starts, it shall measure the winding resistance and
temperature of the motor under test at the ambient temperature. Apply the rated
load to the motor under test in a suitable way and run it to thermal equilibrium
(the rate of change is not more than 2 K/h). Record the following data.
8.3 Load characteristic curve
8.3.1 Overview
This test shall be carried out immediately after the end of the rated load test
while maintaining the operating temperature. If it is not feasible, before starting
to read the test data, the difference between the stator winding’s temperature
and the temperature rise θN measured by the initial rated load thermal test shall
not exceed 5 K.
8.4 Determination of load characteristics of converter-fed motors
After the motor’s thermal test, restart the motor and test the load characteristics.
For example, the motor which has a reference frequency of 50 Hz, respectively
adjust the frequency converter to 3(5) Hz, 15 Hz, 30 Hz, 50 Hz, to measure the
rated torque, 110% rated torque, 80% rated torque of the motor. Measure the
torque value of the motor at each point of nominal power, 110% nominal power,
80% nominal power at the frequency of 60 Hz, 80 Hz, 100 Hz (the nominal
power at this time shall be converted into torque);
9 Determination of loss
9.1 Overview
This standard recommends using method 2-1-1B to determine the various
losses. Method 2-1-1B refers to the use of the sum of the sub-items to
determine the efficiency. The loss of each sub-item includes.
9.2 Iron loss PFe
9.3 Wind friction loss Pfw
9.4 Load loss
9.5 Load stray loss PLL
9.5.1 Residual loss PLr
The input power of each load point minus the output power, and then subtract
the stator winding I2R loss, iron loss, wind friction under the test resistance and
the rotor winding I2R loss corresponding to the measured slip, which is the
residual loss, according to formula (28) Calculation.
9.5.2 Smoothing of residual loss data
The residual loss data shall be smoothed through the linear regression analysis
method (see Figure 5). This linear regression analysis method is as shown in
Appendix D.
9.6 Total loss PT
The total loss is the sum of the corrected iron loss (according to 9.2), the
corrected wind friction loss (according to 9.3), the corrected load loss
(according to 9.4), the load stray loss (according to 9.5), which is calculated
according to formula (35).
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB/T 22670-2018 be delivered?Answer: The full copy PDF of English version of GB/T 22670-2018 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB/T 22670-2018_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 22670-2018_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 22670-2018 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. Question 5: Should I purchase the latest version GB/T 22670-2018?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 22670-2018 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. How to buy and download a true PDF of English version of GB/T 22670-2018?A step-by-step guide to download PDF of GB/T 22670-2018_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB/T 22670-2018".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9
|