This standard applies to the thermal mechanical properties test (referred to as thermal mechanical test) of disc suspension porcelain and glass insulator string components (referred to as insulators) for AC and DC overhead lines with rated voltages higher than 1000V. This standard also applies to insulators of similar structures used in substations. This standard specifies the method of thermal mechanical test and the determination of test results. JB/T 3568-1999 Thermal mechanical properties test method for disc suspension insulator string components JB/T3568-1999 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T3568
Thermal-mechanical performance test on string insulator units1999-08-06www.bzxz.net
Wa Xianji Dong
2000-01-01
JB/T35681999
This standard is a revision of JB3568-84 "Thermal-mechanical performance test method on disc-shaped general insulator components". Since the first edition (1977) of IEC publication 575 "Thermal-mechanical performance test on insulator string components" adopted by JB3568-84 has not been revised, the test method has not changed, only the applied load has been changed from the original 60% of the rated load value to (6065)% of the rated load value, so the IEC foreword of this standard is omitted. The main revisions of this standard
1 The temperature cycle pool range is changed from -40±5℃ to +40±5℃ to -30±5℃ +40±5℃, which is consistent with IEC Publication 575. 2 The applied tensile load is changed from 60% of the rated value to (60～65)% of the rated value. 3 The JB/T3384-1999 "Sampling Plan for High Voltage Insulators" is quoted, so the K value table of the number of receiving bands is deleted. 4 Appendix A of the original JB3568-84 is deleted for routine calculation. This standard replaces JB3568-84 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Insulators. This standard is under the responsibility of Xi'an Electric Ceramics Research Institute. This standard mainly applies to the thermal-mechanical performance test (referred to as thermal-mechanical test) of disc-shaped suspension porcelain and glass insulator string components (referred to as insulators) for AC and DC overhead lines with rated voltages higher than 1000V. This standard is also applicable to insulators of similar structures used in substations. This standard specifies the methods of thermal-mechanical tests and the determination of test results. 2 Referenced standards
The provisions contained in the following standards constitute the text of this standard through reference in this standard. When the standard is published, 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/T2900.8-1995 Electrical terminology insulator JB/T 3384--1999
3 Definitions
Sampling plan for high-voltage insulators
3.1 The definitions of terms used in this standard, except for those specified in this standard, are in accordance with the provisions of GB/T2900.8. 3.2 Thermal cycle test
The test sample is subjected to the specified temperature (air temperature around the test sample) and mechanical load cyclic changes. 3.3 Thermal acid test
The test sample after the thermal cycle test is subjected to electromechanical or mechanical damage negative test. 4 Test method
4.1 Test sample and test sample installation
The test sample must be extracted from the product that has passed the routine test. If this standard is used to conduct a single thermal test on the test sample, the sample size n (i.e. the number of test samples) is generally 10. After the cyclic test, the electromechanical or mechanical destructive test is carried out. The test piece must bear the tensile load during the test. When bearing the load, the test pieces can be connected in parallel. When connected in parallel, the test pieces must bear equal loads. 4.2 Test procedure The test is divided into two stages: cyclic test and destructive test. 4.2.1 Cyclic test The test piece shall be subjected to four 24h hot and cold cycles. Each cycle shall include a cooling process to -30℃±5 and a heating process to +40℃±5℃ (the temperature refers to the temperature of the air around the test piece), with a minimum temperature difference of 70K. Before the first hot and cold cycle, a tensile load equal to 60% to 65% of the rated electromechanical destructive load shall be applied to the test piece at room temperature. The order of hot and cold cycles is cooling first and then heating. The highest and lowest temperatures shall be maintained continuously for at least 4 hours each. When the high temperature stage of each cycle is over, all tensile loads shall be removed and then reapplied immediately. However, after the last cycle is completed, all tensile loads shall be removed at room temperature. At the end of each cycle, a 45kV power frequency voltage shall be applied to the specimen for 1 minute to check whether the specimen is damaged during the test. 4.2.2 Destruction test
After the cyclic test, the specimen shall be subjected to an electromechanical or mechanical destructive load test within one day after the tensile load is removed. Load (%)
Frequency Electromechanical (Mechanical) Destruction Load is taken as 100%100-
5Test Result Judgment Criteria
Thermal Test Procedure Chart
961(h)
5,1 No test sample shall be damaged during the cycle test phase, otherwise it is considered that the product has not passed this test. 5.2 During the destruction test phase, the destruction test results shall comply with the relevant product standards. The electromechanical or mechanical destruction load test adopts a quantitative single sampling plan, and the acceptance quality level (AQL) is 1.5%. According to the number of test samples, the corresponding acceptance constant K can be found in JB/T 3384. If the electromechanical or mechanical destruction negative quality index Q is greater than or equal to the acceptance band number K, it is considered that the product has passed this test, otherwise it has not passed this test.
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