09/30205410 DC : 0

FOREWORD
1 General
   1.1 Scope
   1.2 Normative references
2 Normal and special service conditions
   2.1 Installation in open air
   2.2 Buried installation
   2.3 Installation in tunnel, shaft or similar situation
3 Terms and Definitions
4 Ratings
   4.1 Rated voltage (Ur)
   4.2 Rated insulation level
   4.3 Rated frequency (fr)
   4.4 Rated normal current, temperature rise and
        short time overload capability
   4.5 Rated short-time withstand current (Ik)
   4.6 Rated peak withstand current (Ip)
   4.7 Rated duration of short circuit (tk)
   4.8 Rated supply voltage of closing and opening
        devices and of auxiliary circuits
   4.9 Rated supply frequency of closing and opening
        devices and of auxiliary circuits
   4.10 Rated filling pressure for insulation
5 Design and construction
   5.1 Requirements for gases in GIL
   5.2 Earthing
   5.3 Auxiliary equipment - Monitoring systems
   5.4 Low- and high-pressure signalling devices
   5.5 Nameplates, identification and marking
   5.6 Degree of protection
   5.7 Internal fault
   5.8 Enclosures
   5.9 Partitions & Partitioning
   5.10 Sectionalizing of a GIL system
   5.11 Pressure relief
   5.12 Compensation of thermal expansion
   5.13 Corrosion protection for buried installations
   5.14 External vibration
   5.15 Gas tightness
   5.16 Supporting structures for non-buried GIL
6 Type tests
   6.1 General
   6.2 Dielectric tests
   6.3 Measurement of the resistance of the main circuit
   6.4 Temperature-rise tests
   6.5 Short-time and peak withstand current tests
   6.6 Verification of the degree of protection for
        auxiliary circuits
   6.7 Proof tests for enclosures
   6.8 Gas tightness tests
   6.9 Anti-corrosion tests for buried installation
   6.10 Special mechanical test on sliding contacts
   6.11 Weatherproofing test
   6.12 Test under conditions of arcing due to internal fault
7 Routine tests
   7.1 Power-frequency voltage tests on the main circuits
   7.2 Dielectric tests on auxiliary and control circuits
   7.3 Measurement of the resistance of the main circuit
   7.4 Partial discharge measurement
   7.5 Pressure tests of enclosures
   7.6 Routine gas tightness tests of pressure systems
   7.7 Anti-corrosion tests for buried installations
8 Site testing
   8.1 Voltage test on the main circuits
   8.2 Measurement of gas conditions
   8.3 Measurement of the resistance of the main circuit
   8.4 Tests on enclosures welded on site
   8.5 Periodic testing of the enclosure
   8.6 Checks and verifications
   8.7 Tests on corrosion protection for directly buried GIL
9 Information to be given with enquiries, tenders and orders
   9.1 Information with enquiries and orders
   9.2 Information with tenders and contract documentation
10 Rules for transport, storage, installation and maintenance
   10.1 Conditions during transport, storage and installation
   10.2 Installation
   10.3 Maintenance
11 Safety
   11.1 Electrical aspects
   11.2 Mechanical aspects
   11.3 Thermal aspects
   11.4 Maintenance aspects
Annexes
A (informative) - Estimation of continuous current
B (informative) - Earthing
C (normative) - Long-term testing of buried installations

BS EN 62271-204