BS EN 61467:2008 Insulators for overhead lines. Insulator strings and sets for lines with a nominal voltage greater than 1000 V. AC power arc tests
BS EN 61467 applies to insulator strings and sets comprising string insulator units of ceramic material, glass or composite material for use on a.c. overhead lines and traction lines with a nominal voltage above 1 000 V and a frequency between 15 Hz and 100 Hz.
BS EN 61467 also applies to insulator strings or sets of similar design used in substations.
BS EN 61467 establishes a standard test procedure for power arc tests on insulator sets. It also establishes a standard test procedure for power arc tests on short strings.
BS EN 61467 does not apply to insulator sets mounted on non-metallic poles or towers.
BS EN 61467 cannot be directly applied to line post insulators or sets, or to insulating structures such as braced line-posts, since their mounting arrangement cannot be reproduced by the standard arrangements as described herein. However, this standard can be used as a basis for agreement for tests on such insulators and arrangements.
The object of BS EN 61467 is:
– To define the terms used
– To prescribe a standard test procedure
– To prescribe criteria to evaluate the results of the tests.
Power arc tests are not an obligatory element of line insulator specifications. The standard
test procedures and the evaluation criteria described in BS EN 61467 are intended to provide
testing guidance when power arc tests are felt to be necessary. It is not the object of BS EN 61467 to introduce a general obligation to execute these tests.
Contents of BS EN 61467:
- Scope and object
- Normative references
- Terms and definitions
- Symbols and abbreviations
- Characteristics of the test current
- Supply and return circuit conditions
- Tests on insulator sets
- General remarks
- Test arrangement
- Test current
- Supply and return circuit conditions
- Arc initiation
- Ambient conditions
- Test series and characteristics of the power arcs
- Tests on short strings
- General remark
- Test arrangement
- Test current
- Supply and return circuit conditions
- Arc initiation
- Ambient conditions
- Test series and characteristics of the power arcs
- Test report
- Evaluation of results
- General remark
- Visual examination
- Porcelain or glass insulators
- Composite insulators
- Acceptance criteria
