This part of IEC 60099 covers metal-oxide surge arresters with external series gap (externally gapped line arresters (EGLA) that are applied on overhead transmission and distribution lines, only to protect insulator assemblies from lightning-caused flashovers.

This standard defines surge arresters to protect the insulator assembly from lightning-caused overvoltages only. Therefore, and since the metal-oxide resistors are not permanently connected to the line, the following items are not considered for this standard:

switching impulse sparkover voltage;
residual voltage at steep current and switching current impulse;
thermal stability;
long-duration current impulse withstand duty;
power-frequency voltage versus time characteristics of an arrester;
disconnector test;
aging duties by power-frequency voltage.

Considering the particular design concept and the special application on overhead transmission and distribution lines, some unique requirements and tests are introduced, such as the verification test for coordination between insulator withstand and EGLA protective level, the follow current interrupting test, mechanical load tests, etc.

Designs with the EGLA’s external series gap installed in parallel to an insulator are not covered by this standard.

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PDF Pages	PDF Title
7	English CONTENTS
10	INTRODUCTION Figures Figure 1 – Configuration of an EGLA with insulator and arcing horn
11	1 Scope 2 Normative references
12	3 Terms and definitions
14	4 Identification and classification 4.1 EGLA identification
15	4.2 EGLA classification 5 Standard ratings and service conditions 5.1 Standard rated voltages Tables Table 1 – EGLA classification – “Series X” and “Series Y“ Table 2 – Steps of rated voltages (r.m.s. values)
16	5.2 Standard rated frequencies 5.3 Standard nominal discharge currents 5.4 Service conditions 6 Requirements 6.1 Insulation withstand of the SVU and the complete EGLA
17	6.2 Residual voltages 6.3 High current duty 6.4 Lightning discharge capability 6.5 Short-circuit performance of the SVU 6.6 Mechanical performance
18	6.7 Weather aging of SVU 6.8 Reference voltage of the SVU 6.9 Internal partial discharges 6.10 Coordination between insulator withstand and EGLA protective level 6.11 Follow current interrupting 6.12 Electromagnetic compatibility
19	6.13 End of life 7 General testing procedure 7.1 Measuring equipment and accuracy 7.2 Test samples 8 Type tests 8.1 General
20	8.2 Insulation withstand tests on the SVU housing and on the EGLA with failed SVU Table 3 – Type tests (all tests to be performed without insulator assembly)
22	8.3 Residual voltage tests
24	8.4 Standard lightning impulse sparkover test
25	8.5 High current impulse withstand test
26	8.6 Lightning discharge capability test
27	8.7 Short-circuit tests
33	Table 4 – Test requirements
34	Table 5 – Required currents for short-circuit tests
35	Figure 2 – Examples of SVU units
36	Figure 3 – Short-circuit test setup
37	8.8 Follow current interrupting test Figure 4 – Example of a test circuit for re-applying pre-failing circuit immediately before applying the short-circuit test current
41	8.9 Mechanical load tes ts on the SVU
46	Figure 5 – Thermo-mechanical test
47	Figure 6 – Example of the test arrangement for the thermo-mechanical testand direction of the cantilever load
48	Figure 7 – Test sequence of the water immersion test
51	8.10 Weather aging tests
52	9 Routine tests 9.1 General
53	10 Acceptance tests 10.1 General 10.2 Reference voltage measurement of SVU 10.3 Internal partial discharge test of SVU 10.4 Radio interference voltage (RIV) test Table 6 – Acceptance tests
54	10.5 Test for coordination between insulator withstand and EGLA protective level Table 7 – Virtual steepness of wave front of front-of-wave lightning impulses
55	10.6 Follow current interrupting test 10.7 Vibration test on the SVU with attached electrode
57	Annex A (informative) Example of a test circuit for the follow current interrupting test Figure A.1 – Example of a test circuit for the follow current interrupting test
58	Annex B (normative) Mechanical considerations Figure B.1 – Bending moment – Multi-unit SVU
60	Figure B.2 – SVU unit
61	Figure B.3 – SVU dimensions
63	Bibliography

Status	Withdrawn
Title	Surge arresters – Metal-oxide surge arresters with external series gap (EGLA) for overhead transmission and distribution lines of a.c. systems above 1 kV
Publisher	BSI
Committee	PEL/37
Pages	66
Publication Date	2011-06-30
Withdrawn Date	2018-04-26
Replaced By	BS EN IEC 60099-8:2018
ISBN	978 0 580 63047 7
Standard Number	BS EN 60099-8:2011
Identical National Standard Of	EN 60384-14-2:2004, EN 60099-8:2011, IEC 60099-8:2011, IEC 60384-14-2:2004, EN 60529 Corr 2 (12/16) IEC AS
Descriptors	Metals, Overvoltage protection, Approval testing, Overhead power lines, High-voltage tests, Overvoltage tests, Alternating current, Electrical testing, Impulse-voltage tests, Surge protection, Electrical protection equipment, Oxides, Lightning protection, Thermal testing, Short-circuit current tests, Electric insulators, Withstand voltage, Ratings, Surge limiters
ICS Codes	29.120.50 - Fuses and other overcurrent protection devices


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BS EN 60099-8:2011

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BS EN 60099-5:2013