CONTENTS
FOREWORD 4
1General 6
1.1Scope 6
1.2Normative references 7
2Normal and special service conditions 8
3Terms and definitions 8
3.1General terms 8
3.2Compact switchgear assembly 9
4Rating 9
4.1Rated voltage (Ur) 9
4.2Rated insulation level 10
4.3Rated frequency (fr) 10
4.4Rated normal current (Ir) and temperature rise 10
4.5Rated short-time withstand current (Ik) 10
4.6Rated peak withstand current (Ip) 10
4.7Rated duration of short circuit (tk) 10
4.8Rated supply voltage of closing and opening devices and of auxiliary and
control circuits (Ua) 10
4.9Rated supply frequency of closing and opening devices and of auxiliary
circuits 10
5Design and construction 11
5.3 Earthing of switchgear and controlgear 11
5.101Earthing of compact switchgear assemblies and their controlgear 11
5.102Pressure relief devices 11
5.10 Nameplates 11
5.12 Position indication 11
5.103Locking devices for maintenance operation 11
5.104Movement of pressurized devices 12
5.105Isolating distance for maintenance 12
6Type tests 12
6.1General 12
6.2Dielectric tests 13
6.3Radio interference voltage (r.i.v.) test 13
6.4Measurement of the resistance of circuits 14
6.5Temperature-rise tests 14
6.6Short-time withstand current and peak withstand current tests 14
6.101 Mechanical and environmental tests 15
7Routine tests 17
7.1Dielectric test on the main circuit 17
7.2Tests on auxiliary and control circuits 17
7.3Measurement of the resistance of the main circuit 17
7.101 Functional tests on auxiliary and control circuits 17
8Guide to the selection of switchgear and controlgear 17
8.101 Guide to the selection of compact switchgear assemblies 17
9Information to be given with enquiries, tenders and orders 18
10Transport, storage, installation, operation and maintenance 18
10.1Conditions during transport, storage and installation 18
10.2Installation 18
10.3Operation 18
10.4Maintenance 18
11Safety 18
Annex AA (informative) Explanations of compact switchgear assemblies 19
Bibliography 23
Figure AA.1 – Example for type 1 21
Figure AA.2 – Example for type 2 21
Figure AA.3 – Example for type 3 22
Figure AA.4 – Example for type 3 22
Table 101 – Type tests on the compact switchgear assembly 12
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 205: Compact switchgear assemblies for rated voltages above 52 kV
1 General
1.1 Scope
This part of IEC 62271 applies to compact switchgear assemblies consisting of at least one switching device directly connected to, or sharing components with, one or more other devices such that there is an interaction between the functions of the individual devices. Such assemblies are made up of devices defined in 1.101 and are designed, tested and supplied for use as a single unit. The interaction between devices may be due to proximity, sharing of components or a combination of both. The assemblies may contain components of air insulated switchgear (AIS) only or a combination of AIS and gas insulated switchgear (GIS), so called mixed technology switchgear (MTS) and may be delivered entirely prefabricated or partially assembled.
It is not possible to define all potential arrangements of compact switchgear assemblies however four examples are shown for information in Annex A.
These compact switchgear assemblies are for indoor and/or outdoor installations in systems having rated voltages above 52 kV and service frequencies of 50 Hz and 60 Hz.
This standard covers the influence on performance of the interactions between devices within compact switchgear assemblies and defines ratings and test procedures for these assemblies.
IEC 62271-1 is applicable if not stated otherwise.
This standard does not apply to switchgear assemblies consisting solely of GIS which are covered by 62271-203.
1.101 Objective
The objective of this standard is to respond to the increasing use of compact switchgear assemblies that perform the functions of a number of separate devices and their controlgear. Numerous arrangements are possible and this standard provides guidance on basic types of assemblies which might be envisaged.
As there are potential interactions between devices within such assemblies, it is necessary to consider the standardization requirements for the assembly in its entirety.
The devices, defined by IEC standards, which may form part of a compact switchgear assembly are listed below:
Switching devices:
Circuit-breakers IEC 62271-100
Disconnectors/Earthing switches IEC 62271-102
Switches IEC 60265-2
Disconnecting circuit-breakers IEC 62271-108 Devices:
Instrument transformers
–Current transformers IEC 60044-1, IEC 60044-8
–Voltage transformers IEC 60044-2, IEC 60044-5, IEC 60044-7
–Combined transformers IEC 60044-3
Surge arresters IEC 60099-4
Bushings IEC 60137
Insulators IEC 61462, IEC 62155
Cable connections IEC 62271-209
Transformer connections IEC 61639
Each switching device, device and their controlgear forming part of a compact switchgear assembly shall comply with the relevant individual standard. If part of the compact switchgear assembly is formed by metal enclosed switchgear devices the requirements of IEC 62271-203 apply.
Compact switchgear assemblies, as defined in this standard, are considered to be a single product with a single serial number and one set of documentation.
1.2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60044-1, Instrument transformers – Part 1: Current transformers
IEC 60044-2, Instrument transformers – Part 2: Inductive voltage transformers
IEC 60044-3, Instrument transformers – Part 3: Combined transformers
IEC 60044-5, Instrument transformers – Part 5: Capacitor voltage transformers IEC 60044-7, Instrument transformers – Part 7: Electronic voltage transformers IEC 60044-8, Instrument transformers – Part 8: Electronic current transformers
IEC 60050-441, International Electrotechnical Vocabulary – Chapter 441: Switchgear, controlgear and fuses
IEC 60099-4, Surge arresters – Part 4: Metal-oxide surge arresters without gaps for a.c. systems
IEC 60137, Insulated bushings for alternating voltages above 1 000 V
IEC 60265-2, High-voltage switches – Part 2: High-voltage switches for rated voltages of 52 kV and above
IEC 62271-209, High-voltage switchgear and controlgear – Part 209: Cable connections for gas-insulated metal-enclosed switchgear for rated voltages above 52 kV – Fluid-filled and extruded insulation cables – Fluid-filled and dry-type cable-terminations
IEC 61462, Composite hollow insulators – Pressurized and unpressurized insulators for use in electrical equipment with rated voltage greater than 1 000 V – Definitions, test methods, acceptance criteria and design recommendations
IEC/TR 61639, Direct connection between power transformers and gas-insulated metal- enclosed switchgear for rated voltages of 72,5 kV and above
IEC 61936-1, Power installations exceeding 1 kV a.c. – Part 1: Common rules
IEC 62155, Hollow pressurized and unpressurized ceramic and glass insulators for use in electrical equipment with rated voltages greater than 1 000 V
IEC 62271-1, High-voltage switchgear and controlgear – Part 1:Common specifications
IEC 62271-100, High-voltage switchgear and controlgear – Part 100: High-voltage alternating- current circuit-breakers
IEC 62271-102, High-voltage switchgear and controlgear – Part 102: Alternating current disconnectors and earthing switches
IEC 62271-108, High-voltage switchgear and controlgear – Part 108: High-voltage alternating current disconnecting circuit-breakers for rated voltages of 72,5 kV and above
IEC 62271-203, High-voltage switchgear and controlgear – Part 203: Gas-insulated metal- enclosed switchgear for rated voltages above 52 kV
Bibliography
IEC 60044-6, Instrument transformers – Part 6: Requirements for protective current transformers for transient performance
IEC 60516: 1975, A modular instrumentation system for data handling; CAMAC system
IEC 62063, High-voltage switchgear and controlgear – The use of electronic and associated technologies in auxiliary equipment of switchgear and controlgear
IEC 62271-300, High-voltage switchgear and controlgear – Part 300: Seismic qualification of alternating current circuit-breakers
IEC 62271-2, High-voltage switchgear and controlgear – Part 2: Seismic qualification for rated voltages of 72,5 kV and above