This standard specifies the voltage limits for the insulation withstand voltage test of 2kV~24kV high voltage AC motor stator coil and winding. This standard is applicable to AC generator, synchronous phase condenser and AC motor stator coil and winding insulation AC and DC withstand voltage test. JB/T 6204-2002 Specification for insulation withstand voltage test of high voltage AC motor stator coil and winding JB/T6204-2002 Standard download decompression password: www.bzxz.net

ICS29.160.01
Machinery Industry Standard of the People's Republic of China
JB/T6204—2002
Replaces JB/T6204—1992
Specifications for withstand voltage test on stator coil and winding insulationofhighvoltageACmachines
2002-12-27 Issued
2003-04-01 Implementation
The State Economic and Trade Commission of the People's Republic of China Issued Foreword
2 Normative references
3 General requirements for power frequency AC withstand voltage test Objective
Power frequency AC withstand voltage test voltage (effective value) of coils and windings after main insulation curing 4
DC withstand voltage test and leakage current measurement JB/T6204—2002
JB/T6204-—2002wwW.bzxz.Net
This standard is a revision of JB/T6204-1992 "Stator insulation withstand voltage test specification for large high voltage AC machines". Compared with JB/T6204—1992, the main changes of this standard are as follows: the limit of insulation resistance, withstand voltage test form and lead withstand voltage test have been revised; at the same time, the withstand voltage test of the whole immersed motor has been added. This standard replaces JB/T6204-1992.
This standard is proposed by China Machinery Industry Federation. This standard is under the jurisdiction of the Generator Sub-Technical Committee of the National Technical Committee for Standardization of Rotating Electrical Machines. This standard was drafted by Harbin Large Electric Machine Research Institute, and Shanghai Steam Turbine Generator Co., Ltd., Dongfang Electric Co., Ltd., and North China Electric Power Research Institute Co., Ltd. participated in the drafting. The main drafters of this standard are Sui Yinde, Qi Shifa, Li Zhenhai, etc. This standard was first issued in 1992.
1 Scope
High-voltage AC motor stator coil and winding insulation withstand voltage test specification
JB/T6204-2002
This standard specifies the voltage limit of the insulation withstand voltage test of the stator coil and winding of 2kV~24kV high-voltage AC motor to ground. This standard is applicable to the AC and DC withstand voltage test of the stator coil and winding insulation of AC generators, synchronous condensers and AC motors. 2 Normative references
The clauses in the following documents become clauses of this standard through reference in this standard. For all dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties reaching an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated references, the latest versions are applicable to this standard. GB755-2000 Ratings and performance of rotating electrical machines (idtIEC60034-1:1996) 3 General requirements for power frequency AC withstand voltage test 3.1 This standard adopts the following symbols and units: S (Pn) - rated capacity of the motor (power, generator: MVA; motor: MW; phase regulator: Mvar): UN rated voltage of the motor stator winding: kV: 3.2 The power frequency test voltage waveform should be a real sine wave. The voltage applied during the test starts from no more than half of the full value of the test voltage, and then increases to the full value evenly or in sections at no more than 5% of the full value. The time for the test voltage to increase from half value to full value should be no less than 10s (see GB755--2000). Under the full value voltage, the test time should last for 1 minute, then quickly drop to less than 50% of the full value, and then disconnect the power supply. 3.3 During the coil withstand voltage test, its straight part should be wrapped with tin foil or aluminum foil as an electrode (or placed in a simulated iron core). For coils that require anti-corona treatment, the withstand voltage test should be carried out after the anti-corona treatment. During the test, it is also allowed to use multiple strands of soft bare copper stranded wire wrapped outside the low resistance layer as electrodes, but the winding should be as tight as possible and the spacing should not exceed 10mm. For coils with a rated voltage of 3kV or below, the electrode wrapping length is the iron core length plus 10mm, and for coils above 3kV, the iron core length plus 20mm. 3.4 When the motor is subjected to the withstand voltage test after it is offline, the voltage should be applied between the winding and the casing. At this time, the windings, temperature measuring elements and iron core that are not involved in the test should be connected to the casing and grounded. 3.5 If the motor needs to undergo overspeed, short-time overcurrent, short-time overtorque and short-circuit mechanical strength tests, the factory withstand voltage test should be carried out after these tests: if a temperature rise test is required, the withstand voltage test should be carried out immediately after the temperature rise test. 3.6 Before and after the power frequency AC withstand voltage test of the motor after assembly, the insulation resistance of the winding should be measured with a corresponding insulation resistance meter. 4 Power frequency AC withstand voltage test voltage (effective value) of coils and windings after the main insulation is cured 4.1
For the test voltage of the coil-type coil and the undivided stator composed of it, see Table 1. Table 1
Unit: kv
Test stage
Finished product line diagram
After offline molding
Sz (P%) <10
UN≥2
2.75U%+4.5
2.5Uz+2.5
Test voltage
S% (Pr) ≥10
2≤U≤6.3
2.75U%+4.5
2.5U%+2.5
6.3
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