1.1 Scope
This standard specifies the service conditions, rated characteristics, general structural requirements and test methods of HV/LV or LV/HV prefabricated substations, which are cable-connected, to be operated from inside (walk-in type) or outside (non-walk-in type) for alternating current of rated voltages at 3.6 kV~40.5 kV on the HV side, and for one or more transformers for service frequencies up to and including 50 Hz for outdoor installation in locations with public accessibility.
Note: the prefabricated substations with overhead line may make reference to this standard.
Prefabricated substations can be situated at ground level or partially or completely below ground level.
In general, a prefabricated substation comprises the following main components (functions) and parts:
- Enclosure;
- Power transformers;
- HV switchgear and controlgear;
- LV switchgear and controlgear;
- HV and LV interconnections;
- Auxiliary equipment and circuits.
However, relevant provisions of this standard are applicable to designs where not all these components exist (for example, an installation consisting of power transformer and LV switchgear and controlgear).
Note: non-prefabricated substations shall comply with the service requirements of IEC 61936-1:2002.
Contents
Foreword I
Introduction III
1 General
1.1 Scope
1.2 Normative References
2 Normal and Special Service Conditions
2.1 Normal Service Conditions
2.2 Special Service Conditions
3 Terms and Definitions
4 Rated Values
4.1 Rated Voltages
4.2 Rated Insulation Levels
4.3 Rated Frequency
4.4 Rated Current and Temperature Rise
4.5 Rated Short-time Withstand Current
4.6 Rated Peak Withstand Current
4.7 Rated Duration of Short Circuit
4.8 Rated Supply Voltage of Closing and Opening Devices and Auxiliary and Control Circuits
4.9 Rated Supply Frequency of Closing and Opening Devices and Auxiliary and Control Circuits
4.10 Rated Maximum Capacity and Class of Enclosure of Prefabricated Substation
5 Design and Construction
5.1 Requirements for the Liquid in Switchgear and Controlgear
5.2 Requirements for the Gas in Switchgear and Controlgear
5.3 Earthing
5.4 Auxiliary Equipment
5.5 Power Operation
5.6 Energy Storage Operation
5.7 Operation Independent of Manpower
5.8 Operation of Release
5.9 Low- and High-pressure Interlocking and Monitoring Devices
5.10 Nameplate
5.11 Interlock Device
5.12 Position Indication
5.13 Degree of Protection
5.14 Creepage Distance
5.15 Air and Vacuum Seal
5.16 Liquid Seal
5.17 Inflammability
5.18 Electromagnetic Compatibility (EMC)
5.101 Internal Fault
5.102 Enclosure
5.103 Other Provisions
5.104 Sound Emission
5.105 Requirements for Component
5.106 Requirements for Corrosion Protection of Metal Enclosure
6 Type Test
6.1 General
6.2 Dielectric Tests
6.3 Radio Interference Voltage (r.i.v) Test
6.4 Measurement of Circuit Resistance
6.5 Temperature-rise Tests
6.6 Short-time and Peak Withstand Current Tests on Main and Earthing Circuit
6.7 Verification of the Degree of Protection
6.8 Seal Test
6.9 Electromagnetic Compatibility Test (EMC)
6.101 Tests to Verify the Resistance of the Enclosure against Mechanical Stress
6.102 Internal Arcing Test
6.103 Functional Tests
7 Routine Test
7.1 Dielectric Test on Main Circuit
7.2 Dielectric Test on Auxiliary and Control Circuits
7.3 Measurement of Main Circuit Resistance
7.4 Seal Test
7.5 Design and Visual Inspections
7.101 Verification of Correct Wiring
7.102 Earthing Continuity
7.103 Functional Tests
7.104 Tests after Assembly on Site
8 Guide to the Selection of Prefabricated Substations for Service
8.1 Selection of Rated Values
8.2 Selection of Class of Enclosure
8.3 Selection of Internal Arc Classification
8.4 Information
9 Information to Be Given with Enquiries, Tenders and Orders
9.1 Information with Enquiries and Orders
9.2 Information with Tenders
10 Rules for Transport, Installation, Operation, Maintenance and End-of-Service Life
10.1 Conditions during Transport, Storage and Installation
10.2 Installation
10.3 Operation
10.4 Maintenance
10.5 Dismantling, Recycling and Disposal at the End-of-Service Life
11 Safety
11.1 Electrical Aspects
11.2 Mechanical Aspects
11.3 Thermal Aspects
11.4 Internal Arc Aspects
Appendix A (Normative) Method for Testing the Prefabricated Substation under Conditions of Arcing due to an Internal Fault
Appendix B (Normative) Test to Verify the Sound Level of a Prefabricated Substation
Appendix C (Normative) Mechanical Impact Test
Appendix D (Informative) Rated Value of Transformers in an Enclosure
Appendix E (Informative) Examples of Earthing Circuits
Appendix F (Informative) Characteristics of Enclosure Materials
Bibliography
