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GB/T 1032-2023 PDF English (GB/T 1032-2012: Older version)Search result: GB/T 1032-2023 (GB/T 1032-2012 Older version)
GB/T1032-2023 (GBT1032-2023): PDF in EnglishGB/T 1032-2023 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 29.160.01 CCS K 22 Replacing GB/T 1032-2012 Test Methods for Three-Phase Asynchronous Motors ISSUED ON: SEPTEMBER 7, 2023 IMPLEMENTED ON: APRIL 1, 2024 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of Contents Foreword ... 3 1 Scope ... 5 2 Normative References ... 5 3 Terms and Definitions ... 6 4 Denotations ... 8 5 Test Requirements ... 11 6 Test Preparation ... 15 7 Thermal Test ... 20 8 Load Test ... 36 9 No-Load Test ... 40 10 Locked-Rotor Test... 44 11 Determination of Losses ... 47 12 Determination of Efficiency ... 57 13 Other Test Items ... 107 Annex A (Normative) Correction Methods for Loss and Error of Instrumentation . 122 Annex B (Informative) Comparison Table of Test Methods for Determining Losses and Efficiency ... 127 Annex C (Informative) Linear-Regression Analysis ... 128 Bibliography ... 131 Test Methods for Three-Phase Asynchronous Motors 1 Scope This Document describes the test requirements and test methods for three-phase asynchronous motors. Test methods include measurement of insulation resistance, measurement of DC resistance, thermal test, load test, no-load test, locked-rotor test, determination of loss and efficiency, torque speed characteristic test, moment of inertia test, short-time over-torque test, Inter-turn insulation impulse voltage test, power frequency withstand voltage test, rotor open circuit voltage measurement, overspeed test, vibration and noise measurement, shaft voltage and bearing current measurement. This Document applies to three-phase asynchronous motors. 2 Normative References The provisions in following documents become the essential provisions of this Document through reference in 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) is applicable to this Document. GB/T 755-2019 Rotating electrical machines - Rating and performance GB/T 10068-2020 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 21211-2017 Rotating electrical machines - Equivalent loading and super-position techniques - Indirect testing to determine temperature rise GB/T 22715-2016 Impulse voltage withstand levels of form-wound stator coils for rotating A.C. machines GB/T 22719.1-2008 Interturn insulation of random-wound winding for AC low-voltage electrical machines - Part 1: Test methods 5.2.2 Frequency During the test and measurement process, the average change in power frequency shall be within ±0.1% of the frequency required for the test (see 5.4.2 in GB/T 25442-2018). This requirement is not applicable to equivalent circuit method (see 12.6). 5.3 Measuring instruments and requirements 5.3.1 General description Environmental conditions shall be within the specified range given by the instrument manufacturer. If possible, temperature correction should be made according to the instrument manufacturer's instructions. Digital instruments should be used wherever possible. The accuracy of analog instruments is usually expressed as a percentage of the full scale. Therefore, the smallest range shall be selected according to the actual situation, and the observed reading should be more than 2/3 of the full scale. The full-scale range of the instrument (especially the current sensor) shall match the relevant parameters of the motor under test. 5.3.2 Electrical measurement 5.3.2.1 Effective value Unless otherwise stated, all measurement value of voltage and current are effective value (r.m.s.). 5.3.2.2 Current measuring instruments Generally, the accuracy of current meters shall be no less than grade 0.5 of their full ranges (megameter excluded). To ensure the accuracy and repeatability of the test results when measuring the motor efficiency using Method A or B (see 12.1.4), it is required that the accuracy of the measuring instruments be no lower than grade 0.2 of the full range. NOTE: For the inspection test described in 9.1 of GB/T 755-2019, the accuracy level only needs to be 0.5. Digital instruments have a very large input impedance compared to passive instruments (non- electronic), so there is no need to correct the reading due to the instrument's own losses. But high input impedance instruments are more sensitive to interference. Measures to reduce interference shall be taken based on practical experience. 5.3.2.3 Instrument transformers (or transducer) The accuracy level of the instrument transformer (or transducer) used for measurement shall be no lower than 0.2. When using method B to determine motor efficiency, if the transformer or transducer and the instrument measuring voltage, current or power are calibrated as a system, the error of the system shall not exceed ±0.2% of the full scale. 5.3.2.4 Voltage measurement The signal wire used to measure the terminal voltage shall be connected with the motor terminal. If this is not allowed on the site, it is required to calculate the corresponding error and correct the readings. Arithmetic mean of the three phase voltages (Uuv, Uvw, Uwu) shall be used to obtain the motor performance. 5.3.2.5 Current measurement Each of the three line-currents of electric motors shall be measured concurrently. Arithmetic mean of the three phase currents shall be used to obtain the motor performance. When using current transformer (or transducer), the total impedance of the instruments connected with secondary circuit (including connecting wires) shall be no larger than the rated values. For electric motors with IN < 5 A, current transformer (or transducer) shall not be used except for the locked rotor test and overload test. 5.3.2.6 Power measurement Two-meter method (2 single-phase power meters) shall be used to measure the input power of 3-phase motors. Alternatively, 1 set of 3-phase power meter or 3 sets of single-phase power meters could be used to measure the input power. The voltage signal line of the power meter shall be connected to the winding lead terminal. If the instrumental loss may affect the accuracy of test data, please correct the instrumental loss and the error thereof in accordance with Annex A. 5.3.3 Resistance measurement The winding D.C. resistance shall be measured using electric bridge or digital micro-ohmmeter, of which the accuracy shall be no less than grade 0.2. 5.3.4 Frequency measurement Accuracy of frequency meter shall be no less than grade 0.1. 5.3.5 Measurement of rotating speed or slip 5.3.5.1 Rotation speed measurement temperature (measured with a thermal meter or embedded temperature detector) and the temperature of cooling agent shall not exceed 2K. For large- and medium-scale motors, the keeping time of thermal meters shall be no less than 15 min. For motors practicing a short working system (S2 working shift), the difference between the winding temperature and the temperature of cooling agent, at the beginning of testing, shall be within 5K. 6.2.2 Measurement of Winding D.C. end resistance 6.2.2.1 General D.C. resistance between winding terminals U and V, V and W, W and U is named as end- resistance, which can be separately marked as RUV, RVW and RWU. Winding DC end-resistance can be measured by bridge method, micro-ohmmeter method, DC voltmeter-ammeter method, etc. 6.2.2.2 Bridge Method Each resistance shall be measured for 3 times, each of which shall be measured and read for number after rebalance of electric bridge when using electric bridge for measuring. Difference between each reading and the arithmetic mean value of 3 times of reading shall be no larger than ±0.5% of the mean value, and the mean value shall be taken as the actual value of the resistance. If end-resistance of winding is lower than 1 Ω, Kelvin [double-arm] bridge shall be adopted for measuring. 6.2.2.3 Micro-ohmmeter Method When the winding end-resistance is measured with instruments such as automatic monitoring device or digital micro-ohmmeter, the test current of measured winding shall be no more than 10% of the current during its normal operation, and the conduction time shall be within 1 min. In case that the resistance is less than 0.01 Ω, it is not suitable that the current of winding measured is too low. 6.2.2.4 DC Voltmeter-Ammeter Method The principle wiring diagram of the voltmeter-ammeter method is shown in Figure 2. Among them, Rb is the adjusting current limiting resistance, R is the measured winding end resistance, V is the voltmeter, and A is the ammeter. Figure 2a) is applicable to the situation where the ratio of the internal resistance of the voltmeter to the resistance being measured is greater than 200; Figure 2b) is applicable to the situation where the ratio of the internal resistance of the ammeter to the resistance being measured is less than 1/200. During measurement, the applied current shall be no more than 10% of the rated winding At the beginning of the thermal test, all temperature measuring devices shall be checked to ensure that they do not increase the temperature measurement error due to the influence of stray magnetic fields. The temperature of the fully enclosed motor rotor and other parts can be quickly measured with a temperature measuring device after the power is shut down. 7.3 Measurement method of temperature 7.3.1 General There are three methods of temperature measurement: --- Resistance method; --- Embedded thermometer method; ---Thermometer method. Differ.......Source: https://www.ChineseStandard.net/PDF.aspx/GBT1032-2023 |