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DL/T 557-2021 English PDF

US$349.00 ยท In stock
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DL/T 557-2021: (Definition, test method and criterion of impact breakdown test in air for high voltage line insulators)
Status: Valid

DL/T 557: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
DL/T 557-2021English349 Add to Cart 3 days [Need to translate] (Definition, test method and criterion of impact breakdown test in air for high voltage line insulators) Valid DL/T 557-2021
DL/T 557-2005English519 Add to Cart 3 days [Need to translate] Insulators of ceramic or glass material overhead lines with a nominal voltage greater than 1000V-impulse puncture tests in air Obsolete DL/T 557-2005
DL/T 557-1994English359 Add to Cart 3 days [Need to translate] Insulators of Ceramic or Glass Material Overhead Lines with A Nominal Voltage Greater than 1000V - Impulse Tolerance Tests in Steep Wave Obsolete DL/T 557-1994

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Basic data

Standard ID DL/T 557-2021 (DL/T557-2021)
Description (Translated English) (Definition, test method and criterion of impact breakdown test in air for high voltage line insulators)
Sector / Industry Electricity & Power Industry Standard (Recommended)
Classification of Chinese Standard K48
Word Count Estimation 15,127
Date of Issue 2021-12-22
Date of Implementation 2022-06-22
Older Standard (superseded by this standard) DL/T 557-2005
Issuing agency(ies) National Energy Administration

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Question 5: Should I purchase the latest version DL/T 557-2021?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version DL/T 557-2021 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.