This standard specifies the test parameters, test limits and allowable values ​​of the test waveform difference during automatic test judgment for the inter-turn insulation test of the scattered winding of AC motors. This standard is applicable to the inter-turn insulation test of the scattered winding of small and medium-sized three-phase or single-phase AC motors with a rated voltage of 1140V or below JB/T 9615.2-2000 Inter-turn insulation test limits of the scattered winding of AC low-voltage motors JB/T9615.2-2000 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T9615.2-2000
Test limits of the interturn insulation on random wound windingforAClow-voltagemachines
Published on April 24, 2000
National Bureau of Machinery Industry
Implementation on October 1, 2000
JB/T9615.2-2000
This standard is one of the series of standards for random wound winding interturn insulation of AC low-voltage motors. This series consists of the following two parts: 1JB/T9615.1-2000 Test method for inter-turn insulation of scattered windings of AC low-voltage motors 2JB/T9615.2--2000 Test limit for inter-turn insulation of scattered windings of AC low-voltage motors This standard is a revision of JB/Z346--89 "Inter-turn insulation test limit for scattered windings of AC low-voltage motors" based on GB/T1.1-1993.
Compared with JB/Z346-89, this standard has modified the standard writing format, and the technical content remains basically unchanged. Part of the content has been coordinated with JB/Z294-87, which was revised at the same time.
To meet the needs of automatic detection and according to the development of test technology, this standard adds two comparison parameters, test waveform area difference and test waveform difference area, to the test waveform difference quantity; the size factor K3 is deleted from the impulse test voltage peak calculation formula, so that the test products running in the same power grid have the same test limit requirements; the wavefront time is adjusted according to the IEC standard requirements and still includes the original recommended value. This standard replaces JB/Z346-89 from the date of implementation. Appendix A of this standard is the appendix of the standard.
This standard is proposed and managed by Shanghai Electric Science Research Institute. The drafting unit of this standard: Shanghai Electric Science Research Institute. The main drafters of this standard: Chen Hanqiu and Qin Xiaoxiao. Mechanical Industry Standard of the People's Republic of China
Test limits of the interturn insulation on random wound winding for AC low-voltage machines
1 Scope
JB/T9615.2—2000
Replaces JB/Z346-89
This standard specifies the test parameters, test limits and allowable values ​​of test waveform difference during automatic test judgment for the interturn insulation test of random wound windings of AC motors.
This standard is applicable to the interturn insulation test of random wound windings of small and medium-sized three-phase or single-phase AC motors with a rated voltage of 1140V and below. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of the standard, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 755—2000
Specific ratings and performance of rotating electrical machines
GB/T8170—1987 Rules for rounding off numbers
JB/T9615.1--2000 Test methods for interturn insulation of scattered windings of AC low-voltage electrical machines 3 Definitions
This standard adopts the following definitions
3.1 Comparison parameters
Parameters used to compare the difference in test waveforms in the impulse waveform comparison method (see JB/T9615.1). 3.2 (Test) waveform area difference
The difference in the area (see Figure 1) between the two test waveform curves of the test winding (or coil) and the reference winding (or coil) and the horizontal coordinate (time t) within any specified comparison and judgment interval. 3.3 (Test) Waveform Difference Area
The area between the two test waveform curves in the test winding (or coil) and the reference winding (or coil) within any specified comparison and judgment interval (see Figure 2).
Approved by the State Machinery Industry Bureau on April 24, 2000 and implemented on October 1, 2000
Test Parameters
JB/T9615.2-2000www.bzxz.net
The test parameters are the impulse test voltage peak value, wavefront time, test time, test voltage input direction, test number and test energy. The key test parameters are the impulse test voltage peak value and wavefront time. 4.1 Impulse Test Voltage Peak Value
4.1.1 The impulse test voltage peak value of the inter-turn insulation of the motor winding shall not be less than the value calculated by formula (1) and rounded to the hundredth place (hundred volts) according to GB/T8170.
U =K,XK,XUG
Where: U
-peak voltage of motor winding interturn insulation impulse test, V; -voltage coefficient;
Operation coefficient:
U. Stator or rotor winding insulation to ground power frequency withstand voltage test value (effective value), V. Uc is selected according to GB/T755 or the value specified in the product standard. (1)
4.1.2 Voltage coefficient K, take 1.40
4.1.3 Operation coefficient K, according to the severity of the environmental conditions when the motor is running, the frequency of motor starting or forward and reverse rotation, the difficulty of motor installation or maintenance, additional requirements for motor reliability and safety, etc., select according to Table 1. If there are operating conditions or requirements not listed in the table, they can be selected according to the specific conditions of the product. When several operating conditions or requirements exist at the same time, K2 only takes the highest value. Table 1 Operating coefficient K2
Operating conditions or requirements
General operation
Shallow water diving
Hot and humid environment
Chemical corrosion protection
High-speed operation1)
General marine
Flameproof and increased safety
Shielded operation
Frequent starting or reversing
1) Motor speed>3600r/min;
2) Select according to actual working conditions;
3) Above H grade;
4) Installed in the grinder to directly drive the grinding wheel;
1.05~1.202)
1.10~1.202)
5) Special operation can be determined by negotiation between the manufacturer and the user. 2
Operation conditions or requirements
Severe vibration
High temperature operation3)
Drive grinding head4)
Combined with diving
Combined with submersible oil
Submersible brine for wells
Special ship
Fluorine-resistant refrigeration
Special operation5)
JB/T9615.2-2000
4.1.4 The tolerance of the peak value of the impulse test voltage is 5% or 3%. ±3% is preferred. 4.1.5 The peak value of the impulse test voltage can be measured on the motor winding (terminal) by any of the following methods: a) Calculated by the amplitude and multiple of the voltage waveform; b) Pointer peak voltmeter;
c) Digital peak voltmeter.
It is preferred to use a digital peak voltmeter for measurement. Note: This impulse test voltage is not the nominal output voltage of the tester under its specified load, nor is it the DC voltage for charging the capacitor in the tester. 4.1.6 The accuracy of the impulse test voltage peak measurement can be ±1.5% or ±1.0%. It is recommended to use ±1.0%. 4.2 Wavefront time
The wavefront time of the impulse test voltage can be 0.2us (tolerance o.is) and 1.2us (tolerance ±30%), and 0.2s is recommended. 4.3 Test time
The impulse voltage test time for each wiring conversion shall be based on the ability to make a correct judgment on the test waveform. It is usually 1~3S, which can be shortened during automatic testing.
4.4 Input direction of impulse test voltage
The input direction of the impulse test voltage should be selected according to the actual connection method between the power supply and the motor terminal during operation. 4.4.1 For a single-speed motor with one rated voltage, if its wiring method is fixed (for example, the motor winding is internally connected in Y or △), the impulse test voltage should be input into the winding from the power supply terminal; if it has multiple wiring methods and the power supply line direction is not fixed (for example, it can be input from terminals U, V, W, or from terminals U2, V2, W), the impulse test voltage should be input into the winding from several possible power supply line directions. 4.4.2 For a single-speed motor with multiple rated voltages, the impulse test voltage should be input into the winding from each rated voltage wiring method and several possible power supply line directions.
4.4.3 For a pole-changing multi-speed motor, the impulse test voltage should be input into the winding from each speed wiring method and each possible power supply line direction.
4.5 Number of tests and process tests
4.5.1 For three-phase motors, according to the test connection and selection principles specified in Chapter 5 of JB/T9615.1-2000, select one of the phase (Φ), line (Y), and angle (△) connection methods, and then perform the impulse test in each input direction according to the impulse test voltage specified in 4.4. 4.5.2 For single-phase motors, according to JB/T9615.1, only one impulse voltage test is required for each corresponding winding. 4.5.3 The actual number of impulse voltages that the test product withstands in each test depends on the test instrument. 4.5.4 Except for the turn-to-turn insulation impulse withstand voltage test after the motor is assembled according to JB/T9615.1, the test can be performed in all other processes, or only some of the processes can be selected for testing. The process in which the test is performed and the peak value of the process impulse test voltage are determined by the manufacturer. It is recommended to perform the test before the stator winding is impregnated and after assembly. When the whole machine test is difficult, it is allowed to replace the motor (whole machine) inter-turn insulation impulse withstand voltage test by testing the wound rotor winding and the stator winding after being pressed into the housing according to the requirements of 4.1 before assembly. 5 Comparison parameters
The comparison parameters are the amplitude, oscillation period, waveform area difference and area of ​​the waveform difference of the test waveform. 5.1 Test waveform amplitude and oscillation period
In manual testing, the differences in amplitude and oscillation period of the two test waveforms are usually compared. 5.2 Test waveform area difference and area of ​​waveform difference3
JB/T9615.2-2000
In automatic testing, in addition to comparing the differences in amplitude and oscillation period, the test waveform area difference and the area of ​​waveform difference can also be calculated and compared. It is recommended to select the area of ​​waveform difference for calculation and comparison. 5.3 Allowable value of test waveform difference
When automatically testing and judging, the allowable value of the overall test waveform difference should be pre-tested and calculated according to the provisions of Appendix A (Appendix of the standard).
The allowable value of the overall test waveform difference is used as the setting value of the automatic discrimination and alarm range of the inter-turn insulation impulse withstand voltage test of the batch of motor windings (overall).
A1 Sampling and Pre-test
JB/T9615.2-2000
Appendix A
(Appendix of the Standard)
The allowable value of the test waveform difference and its setting are selected from the tested motors. 10 motor windings are randomly selected as test samples (sample capacity n=10). Each motor winding is used as a test sample unit (test individual). The test sample should be consistent with a batch of motor windings (test population) that needs to be automatically judged and set, and the two have the same specifications, the same materials, the same processes and the same process characteristics. The inter-turn insulation of the test sample should first be subjected to an impulse voltage test according to the peak value of the impulse test voltage specified in this standard. The test waveform display of each test individual should be the "normal fault-free waveform" specified in JB/T9615.1. Otherwise, additional test individuals should be taken for retesting until the specified sample size is reached.
A2 Individual test waveform difference
According to the test wiring method specified in JB/T9615.1, measure the difference X of each test waveform of each test individual in accordance with the provisions of Chapter 4 of this standard.
Take the maximum value Xax of the test waveform difference X (absolute value) during each test of each motor winding as the test waveform difference Xi of the test individual.
A3 Sample test waveform difference
A3.1 Average value X
Calculate the average value X of the sample test waveform difference according to formula (A1): x
A3.2 Standard deviation S
Calculate the standard deviation S of the sample test waveform difference according to the calculation formula (A2) of the small sample standard deviation S: (x - x)
A4 The allowable value of the overall test waveform difference and its judgment setting.... (A1)
（A2）
The allowable value of the overall test waveform difference is the sum of the sample standard deviation S and the maximum value Xi of the test waveform difference of each test individual or the average value of the sample test waveform difference. It is recommended to use the sum of the sample standard deviation S and the average value X of the sample test waveform difference. The allowable value of the overall test waveform difference is used as the setting value for automatic judgment during the inter-turn insulation impulse withstand voltage test of the batch of tested motor windings (overall).
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