NF EN 61325 : 1995

1 Section 1. General
1 Scope
2 Normative references
3 Definitions
Section 2. Insulators
4 Insulator classes and type
5 Insulating materials
6 Specified characteristics and features of a d.c.
      insulator unit
7 Identification of insulators
Section 3. Classification of tests, sampling rules
and procedures
8 Classification of tests
8.1 Type Tests
8.2 Sample Tests
8.3 Routine tests
9 Quality assurance
10 Procedures for type and sample tests
10.1 Insulator selection for type tests
10.2 Sampling rules and procedures for sample tests
10.3 Re-test procedure for the sample tests
Section 4. Test procedures for electrical tests
11 General requirements for high-voltage tests
12 Standard atmospheric conditions and correction
      factors for electrical tests
12.1 Standard reference atmosphere
12.2 Correction factors for atmospheric conditions
13 Mounting arrangements for electrical tests
14 Lightning impulse voltage tests
14.1 Test procedure
14.2 Acceptance criteria
15 Dry d.c. voltage tests
15.1 Test procedure
15.2 Acceptance criteria
16 SF6 puncture withstand test
16.1 Test method
16.2 Acceptance criteria
17 Impulse overvoltage puncture
      withstand test
18 Ion migration test
18.1 Reference conditions used to calculate the
      expected charge
18.2 Test validity
18.3 Test procedure
18.4 Acceptance criteria
19 Electrical body resistance test
19.1 Test procedure
19.2 Acceptance criteria
20 Thermal runaway test
20.1 Duration
20.2 Procedure
20.3 Acceptance criteria
21 Routine electrical test
Section 5. Test procedures for mechanical and other tests
22 Verification of the dimensions
23 Electromechanical failing load test
23.1 Test procedure
23.2 Acceptance criteria
23.3 Coefficient for type tests
23.4 Coefficients for sample tests
24 Mechanical failing load test
24.1 Test procedure
24.2 Acceptance criteria
25 Thermal=-mechanical performance test
25.1 Test procedure
25.2 Acceptance criteria
26 Residual mechanical strength test
26.1 Previous tests
26.2 Preparation of the test pieces
26.3 Test procedure
26.4 Test results
26.5 Acceptance criteria for the type test
26.6 Acceptance criteria for the sample test
26.7 Comparison between type and sample test results
27 Verification of the axial, radial and angular
      displacements
27.1 Test procedure
27.2 Acceptance criteria for cap and pin insulators
27.3 Acceptance criteria for long rod insulators
28 Verification of the locking system
28.1 Conformity of the locking device
28.2 Verification of locking
28.3 Position of the locking device
28.4 Procedure for the operation test
28.5 Acceptance criteria for the operation
      test
29 Temperature cycle test
29.1 Test procedure for string insulator units composed
      of ceramic material
29.2 Special test procedure for insulators with thick
      sections or very large insulators
29.3 Complementary specifications
29.4 Acceptance criteria
30 Thermal shock test
30.1 Test procedure
30.2 Acceptance criteria
31 Porosity test
31.1 Test procedure
31.2 Acceptance criteria
32 Galvanizing test
32.1 Test procedures
32.2 Acceptance criteria
33 Routine visual inspection
33.1 Insulators with ceramic insulating parts
33.2 Insulators with glass insulating parts
34 Routine mechanical test
35 Zinc sleeve test
35.1 General requirements concerning the zinc sleeve
35.2 Type test procedure
35.3 Sample test procedure
36 Zinc collar test
36.1 General requirements for zinc collar
36.2 Type and sample test procedure
Section 6. Tests on string insulator units
37 General
Tables
Figures
Annexes
A Method of comparison of the results of the
      electromechanical or mechanical failing load type
      and sample tests
B Bibliography
ZA (normative) Normative references to international
      publications with their corresponding European
      publications

Specifies: the characteristics of insulators; the conditions under which the specified value of these characteristics shall be verified; acceptance criteria. Applies to string insulator units of ceramic material or glass for use on d.c. overhead power lines with a nominal voltage greater than 1,000 V. Does not apply to composite insulators.