GB/T 22670-2018 English PDF (GBT22670-2018)

Delivery: 3 seconds. Download true-PDF + Invoice.
Get QUOTATION in 1-minute: Click GB/T 22670-2018
Historical versions: GB/T 22670-2018
Preview True-PDF (Reload/Scroll if blank)

GB/T 22670-2018: Test procedures for converter-fed three phase cage induction motors
GB/T 22670-2018
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 
3.1 Terms and definitions ... 7 
3.2 Symbols ... 9 
4 Test requirements ... 12 
4.1 Test power supply ... 12 
4.2 Measuring instruments ... 13 
4.3 Setting of the converter ... 14 
4.4 Measurement requirements ... 15 
5 Test preparation ... 17 
5.1 Determination of insulation resistance ... 17 
5.2 Determination of the DC terminal resistance of the winding in the initial (cold)
state ... 18 
5.3 Test resistance ... 20 
5.4 Winding temperature ... 20 
5.5 Correct to the reference cooling medium temperature ... 21 
6 No-load test ... 22 
6.1 Conditions for no-load test ... 22 
6.2 Determine no-load current and no-load loss ... 22 
6.3 Determine the constant loss PC ... 23 
6.4 Determine wind friction loss Pfw ... 23 
6.5 Determine the iron loss PFe ... 24 
7 Locked-rotor test ... 25 
7.1 Rated frequency locked-rotor test ... 25 
7.2 Breakaway torque test under converter power supply ... 28 
8 Load test ... 28 
8.1 Overview ... 28 
8.2 Rated load test ... 29 
8.3 Load characteristic curve ... 29 
8.4 Determination of load characteristics of converter-fed motors ... 30 
9 Determination of loss ... 31 
9.1 Overview ... 31 
9.2 Iron loss PFe ... 31 
9.3 Wind friction loss Pfw ... 32 
9.4 Load loss ... 32 
9.5 Load stray loss PLL ... 33 
9.6 Total loss PT ... 34 
10 Determination of efficiency ... 35 
10.1 Test method ... 35 
10.2 Method 2-3-A: Summation method of power supply loss of converter ... 35 
10.3 Method 2-3-B: Summation method of loss of specific converter power ... 38 
10.4 Method 2-3-C: Input-output method ... 38 
10.5 Method 2-3-D: Calorimetry ... 39 
11 Thermal test ... 39 
11.1 Purpose ... 39 
11.2 General description ... 40 
11.3 Determination of the temperature of the cooling medium in the thermal test
... 40 
11.4 Determination of the cooling medium temperature at the end of test ... 41 
11.5 Temperature measurement of motor windings and other parts ... 41 
11.6 Thermal test method ... 42 
11.7 Temperature rise ... 48 
11.8 Determination of the winding’s working temperature θw under rated load ... 51 
12 Determination of maximum torque ... 52 
12.1 Overview ... 52 
12.2 Dynamometer or calibrated DC motor method ... 52 
12.3 Torque measuring instrument method ... 53 
12.4 Torque tachometer method ... 53 
12.5 Circular graph calculation method ... 54 
12.6 Conversion of maximum torque ... 56 
13 Determination of minimum torque ... 56 
13.1 Overview ... 56 
13.2 Dynamometer or calibrated DC motor method ... 56 
13.3 Torque measuring instrument method ... 57 
13.4 Torque tachometer method ... 57 
13.5 Conversion of minimum torque ... 57 
14 Other tests ... 58 
14.1 Overspeed test ... 58 
14.2 Determination of noise ... 58 
14.3 Determination of vibration ... 59 
14.4 Short-time over-torque test ... 59 
14.5 Withstanding voltage test ... 59 
14.6 Determination of the moment of inertia ... 61 
14.7 Determination of shaft voltage... 63 
14.8 Determination of bearing current ... 64 
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 
Test procedures for converter-fed three phase cage
induction motors
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
GB/T 25442-2010 Standard methods for determining losses and efficiency
of rotating electrical machines from tests (excluding machines for traction
vehicles)
The frequency at which the converter-fed motor is at base speed.
3.1.8
Fundamental losses
The loss of the motor at the fundamental frequency of the rated sine wave
voltage (usually 50 Hz or 60 Hz), excluding harmonics.
Note: The loss determined according to GB/T 1032-2012 is the fundamental
loss.
3.1.9
Harmonic loss
Additional loss due to non-sinusoidal voltage and current waveforms when
the converter is powered.
Note: Harmonic loss is added to the fundamental wave iron loss,
fundamental wave rotor loss, fundamental wave stator loss, stray loss; is
related to the harmonic content contained in the converter’s output value.
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
P0 - No-load input power, in watts (W).
PK - The input power when the rotor is locked, in watts (W).
Ps - I2R loss of stator winding at test temperature, in watt (W).
Pr - I2R loss of the rotor winding at the test temperature, in watts (W).
Ps,θ - I2R loss of stator winding at specified temperature (θs), in watt (W).
Pr,θ - I2R loss of rotor winding at specified temperature (θs), in watts (W).
PTsin - The corrected total fundamental loss, in watts (W).
PTTest-converter - The corrected total fundamental loss when the converter is ...