JB/T 7785-2007Accelerated test evaluation method for life of insulation systems of low-voltage electrical machines (step stress method) (English PDF)
低压电机绝缘结构寿命快速试验评定方法（步进应力法）
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Issued by
MIIT
Level / Type
Industry · Recommended
Issue date
May 29, 2007
Implementation date
November 1, 2007
Scope
JB/T 7785-2007 is the English-translated version of 低压电机绝缘结构寿命快速试验评定方法（步进应力法）.
JB/T 7785-2007 is the Chinese machinery industry standard covering accelerated test evaluation method for life of insulation systems of low-voltage electrical machines (step stress method).
It was issued on 29 May 2007 and has been in force since 1 November 2007, replacing JB/T 7785-1995. The document is under the responsibility of the Ministry of Industry and Information Technology.
This page is published from the official record of the 2007 edition. The figures, limits and tables the standard contains are those of the document itself, delivered in full with the English translation.
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Document preview — JB/T 7785-2007
National Standard of the People's Republic of China
- Replacing
- JB/T 7785-1995
Issued by: Ministry of Industry and Information Technology of the People's Republic of China
Contents
- [Preview only]
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 3.1 Type
- 3.2 Basic parameters
- 4 Types and basic parameters
- 4.1 Types
- 4.2 Model designation
- 4.3 Nominal operating conditions
- 4.4 Safety and hygiene
- 4.5 Welding
- 4.6 Bridge (After crane operation mechanism assembled)
- 4.7 Assembly
- 4.8 Electrical control equipment
- 4.9 Steel pretreatment and painting
- 5 Technical requirements
- 5.1 General requirements
- 5.2 Safety requirements
- 5.3 Cold and hot working forming
- 5.4 Rated load test
- 5.5 Whole machine noise test
- 5.6 Static rigidity test
- 5.7 Dynamic load test
- 5.8 Crane span deviation
- 5.9 Diagonal difference of bridge
- 6 Test methods
- 6.1 Exit-factory inspection
- 6.2 Type inspection
- 7 Inspection rules
- 7.1 Marking
- 7.2 Packaging, transportation and storage
- 7.3 Transportation
- 7.4 Storage
- 8 Marking, packaging, transportation and storage
- 9 标志和标签 9 Marking and labeling
1 Foreword
JB/T 7785-2007 was issued by Ministry of Industry and Information Technology of the People's Republic of China on 29 May 2007 and has been in force since 1 November 2007.
It replaces the earlier edition JB/T 7785-1995.
The JB/T prefix marks a recommended standard. It is not law in itself: it becomes binding when a contract names it, when a regulation or a mandatory standard refers to it, or when a producer declares conformity with it.
2 Scope Preview
JB/T 7785-2007 carries no ICS number and no Chinese Standard Classification code.
This catalogue holds 21,922 other JB/T standards.
Of the 5,298 JB/T standards that do carry an ICS number, 1,460 (28%) fall under ICS 25, in the field of manufacturing engineering.
3 About this standard
Issued by: Ministry of Industry and Information Technology of the People's Republic of China
English translation: about 15 pages
4 Related standards
Other editions:
JB/T 7785-1995 (earlier edition)
Standards on related subjects:
GB/T 7409.4-2023 — Excitation systems for synchronous machines - Part 4: Technical requirements of excitation systems for medium and small synchronous machines
GB/T 10068-2020 — Mechanical vibration of certain machines with shaft heights 56 mm and higher - Measurement, evaluation and limits of vibration severity
JB/T 9615.1-2000 — Test methods for interturn insulation of random-wound windings of low-voltage AC machines
JB/T 6227-2021 — Hydrogen-cooled electrical machines - Gas tightness test methods and assessment
JB/T 6517-2018 — Technical requirements for hydrogen, oil and water control systems of large generators
JB/T 2728.1-2017 — Gas coolers for electrical machines - Part 1: General rules
5 Classification and status
Chinese Standard Classification (CCS): K 20
Prefix JB/T: recommended standard.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Similar standards
Editions of JB/T 7785
| Edition | Title | Revision | Status |
|---|---|---|---|
| JB/T 7785-2007 | Accelerated test evaluation method for life of insulation systems of low-voltage electrical machines (step stress method) | current edition | Current |
| JB/T 7785-1995 | Accelerated test evaluation method for life of insulation systems of low-voltage electrical machines (step stress method) | previous edition | Superseded |
This page sells the current edition, JB/T 7785-2007. Earlier editions are listed for reference only.
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