1 Scope
This standard specifies the humid heat test method, technical requirements and inspection rules of the rotating machine for service in general environmental condition.
This standard is applicable to all kinds of rotating machines (except mini-type control machine, hereinafter referred to as machine). According to GB 755, the machines in the environment where the relative humidity of service environment is: the average relative humidity in the wettest months is 90% and the average minimal temperature in that month is not higher than 25℃ shall meet the requirements of this standard.
2 Normative References
The following normative documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest editions of these documents are applicable. For undated references, the latest edition of the normative document referred to applies.
GB 755-2000 "Rotating Electrical Machines-Rating and Performance" (idt IEC 60034-1: 1996)
GB/T 2423.3-2006 Environmental Testing for Electric and Electronic Products - Part 2: Testing Method Test Cab: Damp Heat Steady State (idt IEC 60068-2-78: 2001)
GB/T 2423.4-1993 Basic Environmental Testing Procedures for Electric and Electronic Products-Test Db: Damp Heat, Cyclic (eqv IEC 60068-2-78: 1985)
3 Test Methods
3.1 Preparation before the test
3.1.1 Test facilities and equipments
Damp heat test box shall meet the requirements of Chapter 3 of GB/T 2423.4-1993.
The voltage grade of tramegger measuring the insulation resistance shall be in accordance with those specified in Table 1.
