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GB/T 1029-2005 English PDF (GBT1029-2005)

GB/T 1029-2005 English PDF (GBT1029-2005)

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GB/T 1029-2005: Test procedures for three-phase synchronous machines

This Standard specifies the test methods for three-phase synchronous motor. This Standard is applicable to synchronous motors, generators and synchronous cameras with a rated power of 1 kW (kVA) and above. It is not applicable to synchronous motors without DC excitation winding. The test of synchronous motors powered by static variable frequency power supply can be used for reference.
GB/T 1029-2005
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 29.160.01
K 21
Replacing GB/T 1029-1993
Test Procedures for Three-Phase Synchronous
Machines
ISSUED ON: AUGUST 26, 2005
IMPLEMENTED ON: APRIL 01, 2006
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 6
1 Scope ... 8
2 Normative References ... 8
3 Preparation for Test ... 9
4 General Test Items ... 10
4.1 Determination of insulation resistance ... 10
4.2 Determination of DC resistance of winding in actual cold state ... 11 4.3 Determination of shaft voltage ... 14
4.4 Determination of no-load characteristics ... 15
4.5 Determination of steady-state short-circuit characteristics ... 17
4.6 Exciter test ... 18
4.7 Overspeed test ... 18
4.8 Inter-turn short-circuit test of non-salient-pole generator rotor ... 18 4.9 Determination of vibration ... 18
4.10 Inspection of sealing state and determination of hydrogen leakage ... 19 4.11 Inter-turn impulse withstand voltage test ... 19
4.12 Short-time voltage rising test ... 19
4.13 Power frequency withstand voltage test ... 19
4.14 DC leakage current test and DC withstand voltage test for armature winding insulation ... 22
4.15 Determination of sinusoidal distortion rate of voltage waveform ... 24 4.16 Determination of noise ... 25
4.17 Determination of telephone harmonic factor ... 25
5 Efficiency Measurement ... 26
5.1 Direct determination of efficiency ... 26
5.2 Indirect determination of efficiency ... 29
5.3 Calorimetric method ... 31
5.4 Determination of various losses corresponding to rated load ... 31
5.5 Self-deceleration test ... 36
5.6 Determination of efficiency at other loads ... 38
6 Temperature Rise Test ... 38
6.1 Temperature measurement method ... 38
6.2 Determination of cooling medium temperature during temperature rise test 39 6.3 Determination of the temperature of each part of the motor during the temperature rise test ... 40
6.4 Correction of the measured temperature of each part of the motor after being disconnected from the power supply ... 41
6.5 Short-circuit insulation braking method ... 41
6.6 Test method of temperature rise ... 42
7 Determination of Voltage Adjustment Performance at Self-Excited Constant Voltage ... 47
7.1 Determination of steady-state voltage regulation ... 48
7.2 Determination of the degree of voltage deviation when the generator operates under an asymmetric load ... 49
7.3 Determination of change rate of transient voltage ... 49
8 Determination of Torque and Moment of Inertia ... 50
8.1 Determination of locked-rotor current and locked-rotor torque ... 50 8.2 Determination of nominal pull-in torque ... 53
8.3 Determination of pull-out torque of synchronous motor ... 55
8.4 Short-time over-torque test of motor ... 57
8.5 Determination of moment of inertia ... 57
9 Overcurrent and Mechanical Strength Test ... 58
9.1 Accidental overcurrent test ... 58
9.2 Overload test ... 58
9.3 Short-circuit mechanical strength test ... 58
10 Negative Sequence Current Withstand Capability Test ... 59
11 Determination of Dynamic Characteristics of Stator Winding Ends ... 59 12 Determination of Parameters (this Clause Equivalently Adopt IEC 60034-4) ... 59
12.1 Description ... 59
12.2 Determine parameters by no-load saturated characteristics and three-phase steady-state short-circuit characteristics ... 61
12.3 Zero-power factor overexcitation test ... 62
12.4 Determination of excitation current at rated voltage and rated armature current during zero power factor overexcitation ... 62
12.5 Use the no-load characteristic, three-phase steady-state short-circuit characteristic and excitation current corresponding to the rated voltage and rated armature current at zero power factor (overexcitation) to determine the Potier reactance ... 63
12.6 Use Potier diagram to determine the rated excitation current ... 64 12.7 Use the ASA diagram to determine the rated excitation current ... 66 12.8 Use the Swedish diagram to determine the rated excitation current ... 67 12.9 Reverse excitation test ... 68
12.10 Determine Xq by reverse excitation test ... 68
12.11 Low slip-ratio test ... 69
12.12 Determine Xq by low slip-ratio test ... 70
12.13 Determination of power angle ?? by load test ... 70
12.14 Determine Xq as per the method measuring the power angle by the load test ... 71
12.15 Three-phase sudden short-circuit test ... 71
12.16 Parameters determined by three-phase sudden short-circuit test ... 75 12.17 Voltage recovery test ... 76
12.18 Determine parameters by voltage recovery test ... 77
12.19 Externally-applied voltage test when the rotor is located in the positions of direct-axis and quadrature-axis against the magnetic field of the armature winding ... 78
12.20 Determine the parameters by the externally-applied voltage test when the rotor is located in the positions of direct-axis and quadrature-axis against the magnetic field of the armature winding ... 78
12.21 Externally-applied voltage test when the rotor is in any position ... 79 12.22 Determine the parameters by the externally-applied voltage test when the rotor is at any position ... 79
12.23 Two-phase steady-state short-circuit test ... 80
12.24 Determine the parameters by two-phase steady-state short-circuit test .. 81 12.25 Reversed phase sequence test ... 82
12.26 Determine the parameters by reversed phase sequence test ... 82
12.27 Test of single-phase voltage externally-applied to three-phase winding .. 83 12.28 Determine the parameters by the test of single-phase voltage externally- applied to three-phase winding ... 83
12.29 Steady-state short-circuit test of two-phase to neutral-point ... 84 12.30 Determine the parameters by steady-state short-circuit test of two-phase to neutral-point ... 84
12.31 Excitation current decay test when the armature winding is open-circuited ... 85
12.32 Determine T?€?do by the excitation current decay test when the armature winding is open-circuited ... 85
12.33 Excitation current decay test when the armature winding is short-circuited ... 85
12.34 Determining T?€?d by the excitation current decay test when the armature winding is short-circuited ... 86
12.35 Torsion test of suspended rotor ... 86
12.36 Determine Tj and H by the torsion test of the suspended rotor ... 86 12.37 Swing test of auxiliary pendulum ... 87
12.38 Determine Tj and H with the swing test of auxiliary pendulum ... 88 12.39 No-load self-deceleration test ... 88
12.40 Determine Tj and H with no-load self-deceleration test ... 88
12.41 On-load self-deceleration test of mechanically connected units, while synchronous motor run as electric motor ... 89
12.42 Determine Tj and H by the on-load self-deceleration test when the synchronous motor runs as an electric motor ... 89
12.43 Load-dump acceleration test when the motor runs as a generator ... 90 12.44 Determine Tj and H by the load-dump acceleration test when the motor runs as a generator ... 90
12.45 Rated voltage regulation ??UN ... 90
12.46 Determine parameters by known test parameters through calculation ... 91 Appendix A (Normative) Obtain Value ???? at the Excitation Winding Temperature Rise by No-Load Short-Circuit Method ... 94
Appendix B (Informative) Symbols and Units of Physical Quantities ... 96 Test Procedures for Three-Phase Synchronous
Machines
1 Scope
This Standard specifies the test methods for three-phase synchronous motor. This Standard is applicable to synchronous motors, generators and synchronous cameras with a rated power of 1 kW (kVA) and above. It is not applicable to synchronous motors without DC excitation winding. The test of synchronous motors powered by static variable frequency power supply can be used for reference. 2 Normative References
The provisions in following documents become the provisions of this Standard through reference in this Standard. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Standard, however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies.
GB 755-2000 Rotating Electrical Machines -Rating and Performance (idt IEC 60034-1:1996)
GB/T 5321 Measurement of Loss and Efficiency for Large AC Electrical Machines by the Calorimetric Method (GB/T 5321-1985, neq IEC 60034-2A:1974)
GB/T 7409.3 Excitation System for Synchronous Electrical Machines - Technical Requirements of Excitation System for Large and Medium Synchronous
Generators
GB 10068 Mechanical Vibration of Certain Machines with Shaft Heights 56mm and Higher ?€? Measurement, Evaluation and Limits of Vibration (GB 10068-2000, idt IEC 60034-14:1996)
GB/T 10069.1 Measurement of Airborne Noise Emitted by Rotating Electrical Machinery and the Noise Limits-Engineering Method for the Measurement of Airborne Noise
GB/T 10069.2 Measurement of Airborne Noise Emitted by Rotating Electrical Machinery and the Noise Limits-Survey Method for the Measurement of Airborne Noise
GB/T 10585 Fundamental Requirements of Excitation Systems Medium and Small Synchronous Machines
GB/T 15548 General Specification for Three-Phase Synchronous Generators Driven by Reciprocating Internal Combustion Engine
JB/T 6227 Checking Methods and Evaluation of Sealing of Hydrogen-Cooled Electrical Machines
JB/T 7836.1 Electric Heater for Electrical Machine Part 1: General Technique Specifications
JB/T 8445 Test Method of Bearing Capacity of Three-phase Synchronous
Generator for Negative-sequence Current
JB/T 8446 Methods for the Determination of Interturn Short-Circuit in the Rotor Winding of Cylindrical Synchronous Generators
JB/T 8990 Modal Test Analyses and Natural Frequency Measurement Methods of Large Turbo-Generators on Stator End Windings and Evaluation Criteria
JB/T 9615.1 Test Methods of the Interturn Insulation on Random Wound Winding for AC Low-Voltage Machines
JB/T 9615.2 Test Limits of the Interturn Insulation on Random Wound Winding for AC Low-Voltage Machines
JB/T 10098 Impulse Voltage Withstand Levels of Rotating A.C. Machines with Form-Wound Stator Coils (JB/T 10098-2000, idt IEC 60034-15:1995)
JB/T 10500.1 Embedded Thermometer Resistance for Electrical Machines - Part1: General Specification, Measuring Methods and Examine Rule
IEC 60034-2 Rotating Electrical Machines ?€? Part 2: Test Methods for Losses and Efficiency
IEC 60034-4 Rotating Electrical Machines ?€? Part 4: Test Methods for Parameters 3 Preparation for Test
During the test, the accuracy of the used electrical measuring instruments and meters shall be no less than Level-0.5 (except for megohmmeters). When measuring the three-phase power, the three-phase watt-meters with an accuracy of Level-1.0 shall be allowed to use. When measuring temperature, a thermometer with an error of ?? 1??C temperature detector) to measure the temperature of the motor winding, iron core and ambient temperature. The difference between the measured temperature and the temperature of the cooling medium shall not exceed 2K. For large and medium-sized motors, the thermometer shall be taken the measures for heat insulation from the outside; and the time for placing the thermometer shall be no less than 15min. When measuring the temperature of the armature winding and auxiliary winding (such as self-excited constant voltage generator harmonic winding, etc.), the temperature of the winding end and winding slot shall be measured at different locations according to the size of the motor (if there is difficulty, the temperature of iron core teeth and the surface of the iron core yoke may be measured); and take the average value as the temperature of the winding in actual state.
When measuring the temperature of the exciting winding of a salient pole type motor, the temperature may be directly measured at several places on the winding surface; and take the average value as the temperature of the winding in actual cold state. When measuring the temperature of the exciting winding of a non-salient pole motor, the temperature of the winding surface shall be measured. In case of difficulties, the surface temperature of the rotor may be used instead. For large and medium-sized motors, the measurement point shall be no less than three points; and take the average value as the temperature of winding in the actual cold state.
When measuring the temperature of the excitation device winding (such as transformer, reactor winding, etc.) of a self-excited constant voltage generator, use a thermometer to measure the surface temperature of the iron core or winding as the temperature of the winding in actual cold state.
For liquid directly cooled windings, when the liquid is passed, in case that the difference between the temperature of the liquid at the inlet and outlet of the winding does not exceed 1K, and the temperature difference between the iron core temperature and the ambient temperature does not exceed 2K; take the average value of the liquid temperature at the inlet and outlet of the winding as the temperature of winding in the actual cold state.
4.2.2 Determination of DC resistance of the winding
The DC resistance of the winding may be measured by the bridge method, micro- ohmmeter method, voltmeter ammeter method or other measurement methods. 4.2.2.1 When measuring the DC resistance of the winding by automatic detection devices, digital micro-ohmmeters and other instruments, the test current through the tested winding shall not exceed 10% of its rated current; and the energization time shall not exceed 1min.
4.2.2.2 When measuring by a bridge, each resistance shall be measured three times. Unless otherwise specified, the test shall start at 1.3 times the rated voltage of the armature; and adjust the terminal voltage and excitation current until the minimum voltage at which the motor is not out of step. Read 7~ 9 points throughout the process. Each point shall be read the applied voltage, excitation current and frequency (or speed).
If the three-wire voltage is symmetrical, except for reading the three-wire voltage at the rated voltage, other points may only read the one-wire voltage.
If the frequency during the test is different from the rated frequency, the no-load armature voltage is corrected according to Formula (7).
4.4.3 For synchronous motors under 1 000 kVA, the excitation current at rated voltage may be taken as much as possible in the inspection test.
4.5 Determination of steady-state short-circuit characteristics
4.5.1 When measuring the three-phase steady-state short-circuit characteristics, use a low-impedance conductor to reliably short-circuit the line end as close as possible to the armature winding end. During the test, the motor shall be operated in a separate excitation mode.
4.5.2 Generator method
During the test, drag the tested motor to the rated speed; adjust the excitation current so that the armature current is about 1.2 times the rated current; and read the armature current and the excitation current at the same time. Gradually reduce the excitation current, so that it is reduced to zero. Totally, read 5 ~ 7 points, and then draw the short- circuit characteristic curve IK = f(If). If the three-phase current is symmetrical, in addition to reading the three-wire current at the rated current, other points may only read the one-wire current.
4.5.3 Motor method (self-deceleration method)
The tested motor runs at no-load. After cutting off the power supply, immediately reduce the excitation current to zero and cut off the excitation power supply; and then the three-phase armature windings are short-circuited at the same time by the switch prepared in advance.
Turn on the excitation power, adjust the excitation current so that the armature current is about 1.2 times the rated value; at the same time, read the armature current and the excitation current. Gradually reduce the excitation current, and read 5 ~ 7 points within the range allowed by the accuracy of the apparatus. If the test data read during a self- deceleration is insufficient, the above operation can be repeated until sufficient test data is obtained. Then draw the short-circuit characteristic curve IK = f(If). 4.10 Inspection of sealing state and determination of hydrogen leakage
The test method shall be carried out according to the method specified in JB/T 6227. 4.11 Inter-turn impulse withstand voltage test
The inter-turn impulse withstand voltage test shall be carried out in accordance with the methods specified in JB/T 10098, JB/T 9615.1 and JB/T 9615.2.
4.12 Short-time voltage rising test
The test shall be carried out when the motor is at no-load. Except for the following provisions, the externally applied voltage (motor) or induced voltage (generator) of the test is 130% of the rated voltage.
For motors with a no-load voltage at rated excitation current of 130% more than the rated voltage, the test voltage shall be equal to the no-load voltage at rated excitation current.
If there are no other provisions of relevant standards or technical documents, the test time is 3min, except for the following provisions.
If at 130% rated voltage, the test time of the motor with no-load current exceeding the rated current may be shortened to 1min. For a shock exciter, if the voltage during high- speed excitation exceeds 130% of the rated voltage, the test shall be carried out at the limit voltage during high-speed excitation for a period of 1min.
When increasing the test voltage to 130% of the rated voltage, it is allowed to increase the frequency or speed at the same time, but not exceeding 115% of the rated speed or the speed specified in the overspeed test. The allowable increased speed value shall be specified in the standards for various types of motors.
For generators with relatively saturated magnetic circuit, when the speed increases to 115% and the excitation current has also increased to the allowable limit, if the induced voltage value does not reach the specified test voltage, the test is allowed to be carried out at the maximum reachable voltage.
4.13 Power frequency withstand voltage test
The frequency of the test voltage is the power frequency; and the voltage waveform shall be as close to the sinusoidal waveform as possible. During the whole withstand voltage test, necessary safety protection measures shall be taken, and special persons shall be monitored around the tested motor.
4.13.1 Test requirements
4.13.1.1 Unless otherwise specified, the power frequency withstand voltage test shall 5 Efficiency Measurement
5.1 Direct determination of efficiency
Measure the output power and input power of the tested motor to determine the efficiency.
5.1.1 During the test, the tested motor shall be operated at rated power, rated voltage, rated speed and rated power factor until it is thermally stable and then measured. When measuring the input power and output power of the tested motor, the armature current, excitation current and cooling medium temperature of the tested motor shall be measured simultaneously.
When the temperature of the cooling medium is not 25??C, the temperature rise and the DC resistance of each winding sha...

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