BS 2857:1976
Current
The latest, up-to-date edition.
Specification for nickel-iron transformer and choke laminations
Hardcopy , PDF
English
29-10-1976
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Foreword
Cooperating organizations
Specification
1 Scope
2 References
3 Definitions
4 Physical and mechanical characteristics
5 Magnetic characteristics
Appendix
A Method for the calculations of effective parameters
Tables
1 Material classification
2 Dimensions of EI range laminations
3 Dimensions of EE range laminations
4 Dimensions of F range laminations
5 Dimensions of E range laminations
6 Dimensions of ED range laminations
7 Dimensions of EE(L) range laminations
8 Dimensions of F(L) range laminations
9 Thickness and burr limits
10 Minimum space factor
11 Core constants for EI range laminations
12 Core constants for EE and F range laminations
13 Core constants for E range laminations
14 Core constants for ED range laminations
15 Core constants for EE(L) and F(L) range laminations
16 Minimum permeability for EI range laminations
17 Minimum permeability for EE range laminations
18 Minimum permeability for E range laminations
19 Minimum permeability for ED range laminations
20 Minimum permeability for EE(L) range laminations
21 Minimum equivalent parallel resistance coefficient
for EI range laminations, milliohms/turn squared
22 Minimum equivalent parallel resistance coefficient
for EE range laminations, milliohms/turn squared
23 Minimum equivalent parallel resistance coefficient
for E range laminations, milliohms/turn squared
24 Minimum equivalent parallel resistance coefficient
for ED range laminations, milliohms/turn squared
25 Minimum equivalent parallel resistance coefficient
for EE(L) range laminations, milliohms/turn squared
26 Minimum remanence ratio for ED range laminations
Figures
1 Test coil and clamping device for measurements of
EI, EE, EE(L) and ED range laminations
2 Test coil and clamping device for measurements on F
and F(L) range laminations
3 Impedance bridge circuit for the measurement of
equivalent permeability
4 Bridge circuit for the measurement of equivalent
parallel resistance
5 Circuit for the measurement of remanence ratio
6 Circuit for the measurement of incremental
permeability
7 Magnetic circuit elements
Essential requirements, test procedures and other information relating to non-oriented nickel-iron laminations intended for cores for transformer and inductor applications.
| Committee |
EPL/51
|
| DevelopmentNote |
Supersedes 73/76256 DC (06/2005) Reviewed and confirmed by BSI, January 2011. (12/2010)
|
| DocumentType |
Standard
|
| Pages |
34
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
This British Standard specifies essential requirements, test procedures and other information relating to non-oriented and oriented nickel-iron laminations intended for cores for transformer and inductor applications. The surface of laminations is normally oxide coated, but an additional surface coating (e.g. paint or lacquer) may be required by the customer (see 4.3).
| Standards | Relationship |
| UNE-EN 729-4:1995 | Identical |
| IEEE C62.34-2017 | IEEE Standard for Test Methods and Performance of Low-Voltage (1000 V rms or Less) Surge Protective Devices Used on Secondary Distribution Systems (Between the Transformer Low-Voltage Terminals and the Line Side of the Service Equipment) |
| BS 4500(1969) : LATEST | |
| BS 4727-1:GRP07(1973) : LATEST | GLOSSARY OF ELECTROTECHNICAL POWER TELECOMMUNICATION ELECTRONICS LIGHTING AND COLOUR TERMS - TERMS COMMON TO POWER TELECOMMUNICATIONS & ELECTRONICS - MAGNETISM TERMINOLOGY |
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