ICS29.160.10
Machinery Industry Standard of the People's Republic of China
JB/T10098—2000
idtIEC60034-15:1995
Impulse voltage withstand levelsof rotating ac machines withform-wound stator coils
Published on November 29, 2000
State Bureau of Machinery Industry
Implementation on January 1, 2001
JB/T10098-2000
This standard is equivalent to IEC60034-15:1995. Preface
This standard is a revision of JB/T10098-1999 (formerly JB/Z293-87) "AC high voltage motor stator winding turn-to-turn insulation test specification".
Before the formulation of this standard, the relevant standard used in the industry was JB/T10098-1999 (JB/Z293-87) "AC high voltage motor stator winding turn-to-turn insulation test specification". This standard has a wider test scope than JB/T10098-1999 (JB/Z293-87) and has higher test limits than JB/T10098-1999 (JB/Z293-87). Appendix A of this standard is a prompt appendix.
This standard was first promulgated in 1987. In 1999, the marking number was changed to JB/T10098-1999. This standard replaces JB/T10098-1999 from the date of implementation.
This standard is a recommended standard.
This standard is proposed and managed by the National Technical Committee for Standardization of Rotating Electrical Machines. This standard was drafted by the Shanghai Electric Science Research Institute. The main drafters of this standard are: Li Jinliang, Guo Zhong, Jin Yaqi. JB/T10098-2000
IEC Foreword
1) International Electrotechnical Commission IEC is a worldwide standardization organization that includes all national electrotechnical technical committees (IEC National Committees). The purpose of IEC is to promote international cooperation on all standardization issues in the field of electrical and electronic technology. To this end, among other activities, IEC also promulgates international standards. The drafting of standards is entrusted to various technical committees. Any IEC National Committee interested in the subject may participate in the drafting of the standard. International, governmental and non-governmental organizations in contact with the IEC may also participate in the drafting of the standard. The IEC and the International Organization for Standardization ISO work closely under the conditions determined by agreement. 2) IEC formal decisions or agreements on technical topics drafted by technical committees express international consensus on the subject dealt with as much as possible. Because the technical committee represents all the national committees interested in the subject. 3) The documents prepared for international application are recommended and are published in the form of standards, technical reports or guidelines. In this sense, they are accepted by the national committees.
4) In order to promote international consensus, the IEC National Committees explicitly guarantee to adopt IEC international standards as much as possible in their national or regional standards. Any differences between the corresponding national or regional standards and IEC standards should be clearly stated in the standard. International Standard IEC34-15 was drafted by IEC Technical Committee 2 "Rotating Electric Machines". The second edition, as a revised version, replaces the first edition published in 1990. The text of this standard is based on the following documents: Draft International Standard
2(Central Office) 577
Voting Report
2(Central Office) 587A
2(Central Office) 587B
Full information on the voting process for the approval of this standard can be found in the voting reports listed in the table above. Appendix A is for informational purposes only.
JB/T10098-2000
IEC Introduction
bzxZ.netFor the phase-to-earth insulation of equipment in three-phase AC systems, IEC71-1 (GB311.1) publication specifies basic requirements and explains to each equipment committee that they should take into account the recommendations of 71-1 publication and be responsible for specifying insulation levels and test procedures for equipment under their jurisdiction. The purpose of this standard is to specify requirements for rotating electrical machines. Experience has shown that the values specified in this standard can meet the basic requirements for insulation strength during operation under normal working conditions. The principle statements cited in the drafting of these requirements are listed in Appendix A of this standard. HI
1 Scope
Machinery Industry Standard of the People's Republic of China
Impulse voltage withstand levelsof rotating ac machines withform-woundstatorcoils
JB/T10098-2000
idtIEC60034-15:1995
Replaces JB/T10098-1999
This standard specifies the relative impulse withstand voltage levels and test procedures for AC machines with rated voltages of 3KV to 15KV and composed of stator-formed coils, as well as the voltage applied to the main insulation and turn-to-turn insulation of the sample coils to verify the adaptability of the motor. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB755-2000
Ratings and performance of rotating electrical machines (idtIEC60034-1:1996) GB/T16927.1-1997 High voltage test technology Part 1: General test requirements (negIEC60060-1:1989) GB311.1-1997
3 Definitions
Insulation coordination Part 1: Terms, definitions, principles and rules (eqvIEC60071-1:1993) This standard adopts the following definitions:
3.1 Random sampling test: refers to the test conducted on the coils that can fully represent the final structure of the coil and are used in the motor. Its purpose is to evaluate the basic design, material type, manufacturing method and process of the insulation structure. 3.2 Conventional test: refers to the test conducted on all the coils of the motor. 3.3 Stator molded coil: refers to the coil that has been pre-processed and formed before being embedded in the stator. Withstand impulse voltage level
For motors from 3kV to 15kV, the specified withstand impulse voltage level can be obtained by the formula listed in Notes 2 and 4 below Table 1, and the obtained value is rounded to the nearest integer. For common rated voltage levels, Table 1 gives the specified withstand impulse voltage level and the corresponding specified withstand power frequency voltage (effective value) value specified in GB755. Approved by the State Bureau of Machinery Industry on November 29, 2000 and implemented on January 1, 2001
Rated voltage
JB/T10098—2000
Table 1 Specified insulation levels of rotating electrical machines
Specified lightning impulse withstand voltage
(peak value) kV (see Notes 1, 2)
Specified steep wavefront impulse withstand voltage
(peak value) kV (see Notes 3, 4)
According to GB755, power frequency withstand voltage (effective value) kV
Note 1: The level in column 2 is determined based on the standard lightning impulse wave specified in JB/T16927·1, with an apparent wavefront time of 1.2μS and an apparent half-peak time of 50μs.
Note 2: The level in column 2 is obtained by the following formula: U,=4Uy+5kV
Where U: specified lightning impulse withstand voltage (peak value); U%: rated voltage.
Note 3: The level in column 3 is determined based on an impulse wave with an apparent wavefront time of 0.2μs. Note 4: The level in column 3 is obtained by the following formula: U'p=0.65Up
U'p: specified steep impulse withstand voltage (peak value). Note 5: The level requirements listed in columns 2 and 3 are appropriate considering the normal performance of the motor and "usual" operating conditions. Therefore, the levels mentioned above are not appropriate for "special" operating conditions (such as intermittent starting or direct connection of the motor to overhead lines). In these cases, the windings of the motor are either designed to withstand impulse levels of other values or are protected in an appropriate manner. 5 Experiment
Random sampling experiment
5.1.1 Overview
As shown in Appendix A, A.3.As described in Article 2, these tests are performed as indirect inspections. The test coils should be completed coils, including any anti-corona treatment. The coils are embedded in the slots or wrapped with grounded conductive tape or metal foil on the straight part of the coils. Unless otherwise agreed between the manufacturer and the user, the number of sample coils is set at 2. All test coils should meet the requirements specified below. If there is any damage, an investigation should be conducted to determine the cause of the damage. 5.1.2 Impact test of inter-turn insulation
Instructions for use: 1 This column is added according to the actual situation in my country. 2
JB/T10098-2000
5.1.2.1 Apply voltage between the two lead-out terminals of the sample coil and perform an impact test on the inter-turn insulation. 5.1.2.2 Use the Yin Ni oscillation discharge of the capacitor as the inter-turn test voltage. If there is no other agreement between the manufacturer and the user, the number of capacitor discharges is set at 5 times. The apparent wavefront time of the first voltage peak is set to 0.2us, with a tolerance of (+0.3)/-0.1)μs. 5.1.2.3 The peak voltage applied between the two lead-out terminals of the sample coil shall reach the value specified in the third column of Table 1 or the value obtained by the formula listed in Note 4 below Table 1 and rounded to the nearest integer. 5.1.3 Main insulation impact test
Apply power frequency voltage (see 5.1.3.1) or impulse voltage (see 5.1.3.2) to test the impact resistance level of the main insulation. 5.1.3.1 Power frequency voltage test
The specified power frequency voltage (2Un + 1 kV) shall be applied between the coil lead-out terminal and the earth for 1 min, then the voltage shall be increased at a rate of 1 kV/s to reach 2 (2Us + 1 kV), and then the voltage shall be immediately reduced to zero at a rate of at least 1 kV/s. If no breakdown occurs during the process, the corresponding impulse resistance level of the main insulation and the end anti-corona are considered to meet the requirements of Table 1. Note 1: Since the impulse level of the motor is determined by the turn-to-turn voltage of the longitudinal voltage distribution (see A.1.1 and A.1.2), the specified impulse levels listed in columns 2 and 3 of Table 1 are lower than the peak voltage value 2V2 (2U + 1 kV) extended by the test. The purpose of the higher AC test level is to produce a voltage gradient in the slot exit area as close as possible to that formed by the impulse test. Note 2: This standard allows the use of DC test voltages instead of the power frequency voltages specified above, if agreed between the manufacturer and the user. The DC voltage level is specified in the agreement, which should be at least 1.7 times the 1-minute power frequency test voltage specified in GB755. 5.1.3.2 Impulse voltage test
5.1.3.2.1 The impulse test of the main insulation shall apply voltage between the coil lead-out terminal and the ground. 5.1.3.2.2 The main insulation test voltage shall be provided by an impulse voltage generator. According to the provisions of GB/T16927.1, the wavefront time of the impulse voltage is 1.2μs. If there is no other agreement between the manufacturer and the user, the number of impulse waves is set to 5 times. 5.1.3.2.3 The peak voltage between the coil lead-out terminal and the ground shall be 100% of the value listed in the second column of Table 1, or 100% of the value calculated according to the formula Up=4Un+5kV (see Chapter 4) and rounded to the nearest integer. 5.2 Routine test
After all coils are embedded in the stator core, routine tests shall be carried out before wiring. Due to the different processes involved (such as multi-resin insulation, vacuum pressure impregnation), the corresponding test values cannot be specified. Note: The manufacturer is responsible for specifying sufficient values to ensure that the coil is free of defects before being embedded in the stator core and connected. JB/T10098-2000
Appendix A
(Suggested Appendix)
Principles involved in the standard for impulse voltage resistance levels and test methods A.1 Impulse voltage stress (intensity) of motor windings A.1.1 When a steep voltage impulse occurs between one terminal of the motor and the ground, it is impossible for all points in the phase to reach the same potential "suddenly" (that is, during the impulse rise time), so two types of voltage rises appear in the winding: the voltage between the winding copper wire and the ground (transverse voltage) and the voltage along the length of the winding copper wire (longitudinal voltage). A.1.2 While the transverse voltage threatens the main insulation, the longitudinal voltage also threatens the inter-turn insulation. The highest voltage parts of the two types usually appear on the first coil of the winding or the entrance coil. A.1.3 In practice, the voltage surge wave may have different shapes, and the wavefront time may even be reduced to about 0.1μs. A.2 Impulse resistance level of motor windings
A.2.1 Motor windings shall have the specified impulse resistance level in the insulation coordination system. A.2.2 The impulse resistance level specified in column 2 of Table 1 is based on the calculation formula Up=4Us+5kV (see Chapter 4). For the reasons described in A.3.2.2, the values listed in column 2 of Table 1 are used as indicators for the transverse voltage on the motor windings.
A.2.3 The impulse resistance level specified in column 3 of Table 1 is based on the calculation formula U'p=0.65Up. For the reasons described in A.3.2.3, the values listed in column 3 of Table 1 are used as indicators for the longitudinal voltage on the inlet coil of the motor windings.
A.3 Inspection of impulse resistance voltage level
A.3.1 It is not recommended to perform impulse tests on the entire machine. This is because, according to the current state of knowledge, any inter-turn fault is difficult to detect when testing the entire machine. Therefore, the impulse voltage withstand level can only be indirectly verified by random sampling tests of individual coils. A.3.2 Indirect verification of random sampling tests of coils A.3.2.1 The sample coils should be subjected to electrical stresses as close to the actual situation as possible during random sampling tests, just like the coils in the entire machine winding that are subjected to the largest inter-turn and/or ground electrical stresses (that is, the usual winding entry coils). According to this principle, the impulse voltage withstand level of the entire machine winding can be indirectly verified by testing sample coils. A.3.2.2 The peak value of the transverse voltage (between the copper conductor and the ground) appearing on the entry coil (therefore, on the sample coil for random sampling tests) is equal to the peak value of the impulse voltage on the complete winding. This peak value may be higher than the peak voltage V2 (2U+1kV) of the normal test at power frequency, but it will usually not be higher than the value derived from the test in Article 5.1.3.1. A.3.2.3The peak value of the longitudinal voltage appearing on the inlet coil varies greatly due to at least the following factors: - impulse voltage rise time t;
- the length of the copper wire of the inlet coil:
- the number of turns and arrangement of the wire.
The actual value can be investigated and studied by applying a "simulated impulse voltage" of, for example, several hundred volts peak voltage to the terminals of the whole machine. Summarizing the relevant survey results, it is difficult to derive a simple rule for calculating the peak voltage based on the specific structure of the motor. 4
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People's Republic of China
Mechanical Industry Standard
AC Motor Stator Formed Coil Impulse Voltage Withstand Level JB/T10098-2000
Electrical Equipment Industry Association
Mechanical Industry Beijing Electrical Engineering and Economics Research Institute Published and Distributed
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First Printing in March 2001
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