This standard specifies requirements for gas-insulated metal-enclosed switchgear in which the insulation is obtained, at least partly, by an insulating gas other than air at atmospheric pressure, for alternating current of rated voltages of 72.5kV and above, for indoor and outdoor installation, and for service frequency of 50Hz.
For the purpose of this standard, the terms "GIS" and "switchgear" are used for "gas-insulated metal-enclosed switchgear".
The gas-insulated metal-enclosed switchgear covered by this standard consists of individual components intended to be directly connected together and able to operate only in this manner.
This standard completes and amends, if necessary, the various relevant standards applying to the individual components constituting GIS.
1.2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding any corrections) to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest editions of these documents are applicable. For undated references, the latest editions of the referenced documents apply.
Subclause 1.2 of GB/T 11022 is applicable with the following additions:
GB 1207-2006 "Inductive Voltage Transformers" (IEC 60044-2: 2003, MOD)
GB/T 8905-1996 "The Guide for Processing and Measuring SF6 Gas in Power Apparatus" ( neq IEC 60480: 1974)
GB/T 9326 (all) "Oil-filled Paper or Polypropylene Paper Laminate Insulated Metal-sheathed Cables and Accessories for Alternating Voltages up to and including 500kV" (IEC 60141-1, MOD)
GB/T 11017.1-2002 "Power Cables with Cross-linked Polythylene Insulation and Their Accessories for Rated Voltage of 110kV-Part 1: Test Methods and Requirements" (eqv IEC 60840: 1999)
GB/T 11023-1989 "Test Guide of SF6 Gas Tightness for High-voltage Switchgear"
GB/T 13540-1992 "Anti-seismic Characteristic Test for High-voltage Switchgear"
GB/T 22381 "Cable Connections for Gas-insulated Metal-enclosed Switchgear for Rated Voltages of 72.5kV and Above--Fluid-filled and Extruded Insulation Power Cables--Fluid-filled and Dry Type Cable Terminations" (GB/T 22381-2008, IEC/TS 60859, MOD)
GB/T 22382 "Direct Connection between Power Transformers and Gas-insulated Metal-enclosed Switchgear for Rated Voltage of 72.5kV and Above" (GB/T 22382-2008, IEC/TR 61639, MOD)
ISO 3231 "Paints and Varnishes--Determination of Resistance to Humid Atmospheres Containing Sulfur Dioxide"
IEC 60815 "Guide for the Selection of Insulators for Polluted Conditions"
IEC 61462 "Composite Insulators--Disk Insulators for Use in Outdoor and Indoor Electrical Equipment--Definitions, Test Methods, Acceptance Criteria and Design Recommendations"
IEC 62067 "Power Cables with Dry Insulation and Their Accessories for Rated Voltages Above 150kV (Um=170kV) up to 500kV (Um=550kV)--Test Methods and Requirements"
IEC 62155 "Hollow Pressurized and Unpressurized Ceramic and Glass Insulators for Use in Electrical Equipment with Rated Voltages Greater than 1000V"
Note: Other standards are referred to for information in this standard. They are listed in the Bibliography.
2 Normal and Special Service Conditions
Clause 2 of GB/T 11022-1999 is applicable with the following additions:
At any altitude the dielectric characteristics of the internal insulation are identical with those measured at sea-level. For this internal insulation, therefore, no specific requirements concerning the altitude are applicable.
Some items of a GIS such as pressure relief devices and pressure and density monitoring devices may be affected by altitude. The manufacturer shall take appropriate measures if necessary.
2.1 Normal Service Conditions
Subclause 2.1 of GB/T 11022-1999 is applicable, taking into the account Table 101 of this standard.
2.2 Special Service Conditions
Subclause 2.2 of GB/T 11022-1999 is applicable, taking into account Table 101 of this standard.
In case where higher than (>) is used in the table, the value shall be specified by the user as described in GB/T 11022.
Table 101 Reference Table of Service Conditions Relevant to GIS
Item Normal Special
Indoor Outdoor Indoor Outdoor
Ambient air temperature:
Minimum (℃)
Maximum (℃) -5, -15 or -25
+40 -10, -25, -30 or -40
+ 40 -25
+50 -50*
+50
Solar radiation (W/m2) Not applicable 1 000 Not applicable >1 000
Altitude (m) 1 000 1 000 >1 000 >1 000
Pollution classa Not applicable Ⅱ and Ⅲ Ⅱ, Ⅲ and Ⅳ Ⅲ or Ⅳ
Ice coating (mm) Not applicable 10 or 20 Not applicable >20
Wind speed (m/s) Not applicable 34 Not applicable >34
Humidity (%) (daily mean) (outdoor humidity shall be as required in GB/T 11022) 95 100 98 100
Condensation or precipitation Occasional Yes Yes Yes
Vibration class Not applicable Not applicable GB/T 13540 GB/T 13540
Induced electromagnetic disturbances in secondary system (kV) 1.6 1.6 >1. 6 >1. 6
Note: The user's specification may use any combination of normal or special service conditions above.
a Pollution classes II, III and IV are according to Table 1 of IEC 60815.
* The impact of low temperature on gas pressure shall be considered.
Contents Foreword I 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 Ratings 4.1 Rated Voltage for Equipment (Ur) 4.2 Rated Insulation Level 4.3 Rated Frequency (fr) 4.4 Rated Normal Current and Temperature Rise 4.5 Rated Short-time Withstand Current (Ik) 4.7 Rated Duration of Short-circuit (tk) 4.8 Rated Supply Voltage of Closing and Opening Devices and of Auxiliary and Control Circuits (Ua) 4.9 Rated Supply Frequency of Closing and Opening Devices and of Auxiliary Circuits 4.10 Rated Pressure of Compressed Gas Supply for Insulation and/or Operation 5 Design and Construction 5.1 Requirements for Liquids in Switchgear and Controlgear 5.2 Requirements for Gases in Switchgear and Controlgear 5.3 Earthing of Switchgear and Controlgear 5.4 Auxiliary and Control Equipment 5.5 Power Operation 5.6 Stored Energy Operation 5.7 Independent Manual Operation 5.8 Operation of Releases 5.9 Low- and High-pressure Interlocking and Monitoring Devices 5.10 Nameplates 5.11 Interlocking Devices 5.12 Position Indication 5.13 Degrees of Protection by Enclosures 5.14 Creepage Distances 5.15 Gas and Vacuum Tightness 5.16 Liquid Tightness 5.17 Flammability 5.18 Electromagnetic Compatibility (EMC) 5.101 Pressure Coordination 5.102 Internal Fault 5.103 Enclosures 5.104 Partitions 5.105 Pressure Relief 5.106 Noise 5.107 Interfaces 5.108 Corrosion 5.109 Expansion Joint 5.110 Inspection Window 6 Type Tests 6.1 General 6.2 Dielectric Tests 6.3 Radio Interference Voltage (r.i.v.) Test 6.4 Measurement of the Resistance of Circuits 6.5 Temperature-rise Tests 6.6 Short-time Withstand Current and Peak Withstand Current Tests 6.7 Verification of the Protection 6.8 Gas Tightness Tests and Gaseous State Measurement 6.9 Electromagnetic Compatibility Tests (EMC) 6.10 Additional Tests on Auxiliary and Control Circuits 6.101 Verification of Making and Breaking Capacities 6.102 Mechanical and Environmental Tests 6.103 Proof Tests for Enclosures 6.104 Pressure Test on Partitions 6.105 Test under Conditions of Arcing Due to an Internal Fault 6.106 Insulator Tests 6.107 Corrosion Test on Earthing Connections 7 Routine Tests 7.1 Dielectric Test on the Main Circuit 7.2 Tests on Auxiliary and Control Circuits 7.3 Measurement of the Resistance of the Main Circuit 7.4 Tightness and Gaseous State Tests 7.5 Design and Visual Checks 7.101 Pressure Tests of Enclosures 7.102 Mechanical Operation Tests 7.103 Tests on Auxiliary Circuits, Equipment and Interlocks in the Control Mechanism 7.104 Pressure Test on Partitions 8 Guide to the Selection of Switchgear and Controlgear 9 Information to be Given with Enquiries, Tenders and Orders 9.101 Information with Enquiries and Orders 9.102 Information with Tenders 10 Rules for Transport, Storage, Installation, Operation and Maintenance 10.1 Conditions during Transport, Storage and Installation 10.2 Installation 10.3 Operation 10.4 Maintenance 11 Safety 12 Environmental Aspects Annex A (Normative) Test Procedure for Dielectric Test on Three-phase Encapsulated GIS, Range II A.1 Dielectric Procedures for Three Phases in One GIS Enclosure A.2 Application of Test Requirements Annex B (Normative) Methods for Testing Gas-insulated Metal-enclosed Switchgear Under B.1 Introduction B.2 Short-circuit Current Arcing Test B.2.1 Test Arrangements B.2.2 Current and Voltage Applied B.2.3 Test Procedure B.2.4 Assessment of the Test B.2.5 Test Report B.2.6 Extension of the Test Results B.3 Composite Verification by Calculation and Separate Tests Annex C (Normative) Technical and Practical Considerations of Site Testing C.1 Test Voltage Generators C.2 Locating Discharges C.3 Special Test Procedures C.3.1 Testing at Reduced Voltage C.3.2 Testing at Reduced Gas Density C.4 Partial Discharge Measurements C.5 Electrical Conditioning C.6 Repetition Tests C.6.1 General C.6.2 Recommended Procedure C.7 Partial Discharge Detection Method C.7.1 Introduction C.7.2 Conventional Method According to GB/T 7354 C.7.3 VHF/UHF Method C.7.4 Acoustic Method C.7.5 Sensitivity Verification of Acoustic and VHF/UHF Method Annex D (Informative) Calculations Related to an Internal Fault D.1 Calculation of Pressure Rise Due to an Internal Fault Annex E (Informative) Information to be Given with Enquiries, Tenders and Orders E.1 Introduction E.2 Normal and Special Service Conditions E.3 Ratings E.4 Design and Construction E.5 Bus Ducts E.6 Circuit-breaker E.7 Disconnector and Earthing Switch E.8 Bushing E.9 Cable Connection E.10 Transformer Connection E.11 Current Transformer E.12 Inductive Voltage Transformer E.13 Documentation for Enquiries and Tenders Bibliography Figure 101 Pressure Coordination Figure 102 Example of Arrangement of Enclosures and Gas Compartments Table 101 Reference Table of Service Conditions Relevant to GIS Table 102 Preferred Rated Insulation Levels for Rated Voltages for Equipment of Range I Table 103 Preferred Rated Insulation Levels for Rated Voltages for Equipment of Range II Table 104 Performance Criteria Table 105 Example of Grouping of Type Tests Table 106 Test Voltage for Measuring PD Intensity Table 107 On Site Test Voltages Table A.101 Switching Impulse Test Conditions above 252 kV
1 General
1.1 Scope
This standard specifies requirements for gas-insulated metal-enclosed switchgear in which the insulation is obtained, at least partly, by an insulating gas other than air at atmospheric pressure, for alternating current of rated voltages of 72.5kV and above, for indoor and outdoor installation, and for service frequency of 50Hz.
For the purpose of this standard, the terms "GIS" and "switchgear" are used for "gas-insulated metal-enclosed switchgear".
The gas-insulated metal-enclosed switchgear covered by this standard consists of individual components intended to be directly connected together and able to operate only in this manner.
This standard completes and amends, if necessary, the various relevant standards applying to the individual components constituting GIS.
1.2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding any corrections) to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest editions of these documents are applicable. For undated references, the latest editions of the referenced documents apply.
Subclause 1.2 of GB/T 11022 is applicable with the following additions:
GB 1207-2006 "Inductive Voltage Transformers" (IEC 60044-2: 2003, MOD)
GB 1208-2006 "Current Transformers" (IEC 60044-1: 2003)
GB 1984-2003 "High-voltage Alternating-current Circuit-breakers" (IEC 62271-100: 2001, MOD)
GB 1985-2004 "High-voltage Alternating-current Disconnectors and Earthing Switches" (IEC 62271-102: 2002, MOD)
GB/T 2423.17-2008 "Environmental Testing for Electric and Electronic Products-Part 2: Test Method--Test Ka: Salt Mist" (IEC 60068-2-11: 1981, IDT)
GB/T 4109-2008 Insulated Bushings for Alternating Voltage Above 1000V (IEC 60137 Ed.6.0, MOD)
GB/T 7354-2003 "Partial Discharge Measurements" (IEC 60270: 2000, IDT)
GB/T 8905-1996 "The Guide for Processing and Measuring SF6 Gas in Power Apparatus" ( neq IEC 60480: 1974)
GB/T 9326 (all) "Oil-filled Paper or Polypropylene Paper Laminate Insulated Metal-sheathed Cables and Accessories for Alternating Voltages up to and including 500kV" (IEC 60141-1, MOD)
GB/T 11017.1-2002 "Power Cables with Cross-linked Polythylene Insulation and Their Accessories for Rated Voltage of 110kV-Part 1: Test Methods and Requirements" (eqv IEC 60840: 1999)
GB/T 11023-1989 "Test Guide of SF6 Gas Tightness for High-voltage Switchgear"
GB/T 12022-2006 "Sulphur Hexafluoride for Industrial Use" (IEC 60376: 1971, IEC 60376A: 1973, IEC 60376B: 1974, MOD)
GB/T 13540-1992 "Anti-seismic Characteristic Test for High-voltage Switchgear"
GB/T 22381 "Cable Connections for Gas-insulated Metal-enclosed Switchgear for Rated Voltages of 72.5kV and Above--Fluid-filled and Extruded Insulation Power Cables--Fluid-filled and Dry Type Cable Terminations" (GB/T 22381-2008, IEC/TS 60859, MOD)
GB/T 22382 "Direct Connection between Power Transformers and Gas-insulated Metal-enclosed Switchgear for Rated Voltage of 72.5kV and Above" (GB/T 22382-2008, IEC/TR 61639, MOD)
ISO 3231 "Paints and Varnishes--Determination of Resistance to Humid Atmospheres Containing Sulfur Dioxide"
IEC 60815 "Guide for the Selection of Insulators for Polluted Conditions"
IEC 61462 "Composite Insulators--Disk Insulators for Use in Outdoor and Indoor Electrical Equipment--Definitions, Test Methods, Acceptance Criteria and Design Recommendations"
IEC 61672-1 "Electroacoustics--Sound Level Meters--Part 1: Technical Requirements"
IEC 61672-2 "Electroacoustics--Sound Level Meters--Part 2: Pattern Evaluation Tests"
IEC 62067 "Power Cables with Dry Insulation and Their Accessories for Rated Voltages Above 150kV (Um=170kV) up to 500kV (Um=550kV)--Test Methods and Requirements"
IEC 62155 "Hollow Pressurized and Unpressurized Ceramic and Glass Insulators for Use in Electrical Equipment with Rated Voltages Greater than 1000V"
Note: Other standards are referred to for information in this standard. They are listed in the Bibliography.
2 Normal and Special Service Conditions
Clause 2 of GB/T 11022-1999 is applicable with the following additions:
At any altitude the dielectric characteristics of the internal insulation are identical with those measured at sea-level. For this internal insulation, therefore, no specific requirements concerning the altitude are applicable.
Some items of a GIS such as pressure relief devices and pressure and density monitoring devices may be affected by altitude. The manufacturer shall take appropriate measures if necessary.
2.1 Normal Service Conditions
Subclause 2.1 of GB/T 11022-1999 is applicable, taking into the account Table 101 of this standard.
2.2 Special Service Conditions
Subclause 2.2 of GB/T 11022-1999 is applicable, taking into account Table 101 of this standard.
In case where higher than (>) is used in the table, the value shall be specified by the user as described in GB/T 11022.
Table 101 Reference Table of Service Conditions Relevant to GIS
Item Normal Special
Indoor Outdoor Indoor Outdoor
Ambient air temperature:
Minimum (℃)
Maximum (℃) -5, -15 or -25
+40 -10, -25, -30 or -40
+ 40 -25
+50 -50*
+50
Solar radiation (W/m2) Not applicable 1 000 Not applicable >1 000
Altitude (m) 1 000 1 000 >1 000 >1 000
Pollution classa Not applicable Ⅱ and Ⅲ Ⅱ, Ⅲ and Ⅳ Ⅲ or Ⅳ
Ice coating (mm) Not applicable 10 or 20 Not applicable >20
Wind speed (m/s) Not applicable 34 Not applicable >34
Humidity (%) (daily mean) (outdoor humidity shall be as required in GB/T 11022) 95 100 98 100
Condensation or precipitation Occasional Yes Yes Yes
Vibration class Not applicable Not applicable GB/T 13540 GB/T 13540
Induced electromagnetic disturbances in secondary system (kV) 1.6 1.6 >1. 6 >1. 6
Note: The user's specification may use any combination of normal or special service conditions above.
a Pollution classes II, III and IV are according to Table 1 of IEC 60815.
* The impact of low temperature on gas pressure shall be considered.
Contents of GB 7674-2008
Contents
Foreword I
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 Ratings
4.1 Rated Voltage for Equipment (Ur)
4.2 Rated Insulation Level
4.3 Rated Frequency (fr)
4.4 Rated Normal Current and Temperature Rise
4.5 Rated Short-time Withstand Current (Ik)
4.7 Rated Duration of Short-circuit (tk)
4.8 Rated Supply Voltage of Closing and Opening Devices and of Auxiliary and Control Circuits (Ua)
4.9 Rated Supply Frequency of Closing and Opening Devices and of Auxiliary Circuits
4.10 Rated Pressure of Compressed Gas Supply for Insulation and/or Operation
5 Design and Construction
5.1 Requirements for Liquids in Switchgear and Controlgear
5.2 Requirements for Gases in Switchgear and Controlgear
5.3 Earthing of Switchgear and Controlgear
5.4 Auxiliary and Control Equipment
5.5 Power Operation
5.6 Stored Energy Operation
5.7 Independent Manual Operation
5.8 Operation of Releases
5.9 Low- and High-pressure Interlocking and Monitoring Devices
5.10 Nameplates
5.11 Interlocking Devices
5.12 Position Indication
5.13 Degrees of Protection by Enclosures
5.14 Creepage Distances
5.15 Gas and Vacuum Tightness
5.16 Liquid Tightness
5.17 Flammability
5.18 Electromagnetic Compatibility (EMC)
5.101 Pressure Coordination
5.102 Internal Fault
5.103 Enclosures
5.104 Partitions
5.105 Pressure Relief
5.106 Noise
5.107 Interfaces
5.108 Corrosion
5.109 Expansion Joint
5.110 Inspection Window
6 Type Tests
6.1 General
6.2 Dielectric Tests
6.3 Radio Interference Voltage (r.i.v.) Test
6.4 Measurement of the Resistance of Circuits
6.5 Temperature-rise Tests
6.6 Short-time Withstand Current and Peak Withstand Current Tests
6.7 Verification of the Protection
6.8 Gas Tightness Tests and Gaseous State Measurement
6.9 Electromagnetic Compatibility Tests (EMC)
6.10 Additional Tests on Auxiliary and Control Circuits
6.101 Verification of Making and Breaking Capacities
6.102 Mechanical and Environmental Tests
6.103 Proof Tests for Enclosures
6.104 Pressure Test on Partitions
6.105 Test under Conditions of Arcing Due to an Internal Fault
6.106 Insulator Tests
6.107 Corrosion Test on Earthing Connections
7 Routine Tests
7.1 Dielectric Test on the Main Circuit
7.2 Tests on Auxiliary and Control Circuits
7.3 Measurement of the Resistance of the Main Circuit
7.4 Tightness and Gaseous State Tests
7.5 Design and Visual Checks
7.101 Pressure Tests of Enclosures
7.102 Mechanical Operation Tests
7.103 Tests on Auxiliary Circuits, Equipment and Interlocks in the Control Mechanism
7.104 Pressure Test on Partitions
8 Guide to the Selection of Switchgear and Controlgear
9 Information to be Given with Enquiries, Tenders and Orders
9.101 Information with Enquiries and Orders
9.102 Information with Tenders
10 Rules for Transport, Storage, Installation, Operation and Maintenance
10.1 Conditions during Transport, Storage and Installation
10.2 Installation
10.3 Operation
10.4 Maintenance
11 Safety
12 Environmental Aspects
Annex A (Normative) Test Procedure for Dielectric Test on Three-phase Encapsulated GIS, Range II
A.1 Dielectric Procedures for Three Phases in One GIS Enclosure
A.2 Application of Test Requirements
Annex B (Normative) Methods for Testing Gas-insulated Metal-enclosed Switchgear Under
B.1 Introduction
B.2 Short-circuit Current Arcing Test
B.2.1 Test Arrangements
B.2.2 Current and Voltage Applied
B.2.3 Test Procedure
B.2.4 Assessment of the Test
B.2.5 Test Report
B.2.6 Extension of the Test Results
B.3 Composite Verification by Calculation and Separate Tests
Annex C (Normative) Technical and Practical Considerations of Site Testing
C.1 Test Voltage Generators
C.2 Locating Discharges
C.3 Special Test Procedures
C.3.1 Testing at Reduced Voltage
C.3.2 Testing at Reduced Gas Density
C.4 Partial Discharge Measurements
C.5 Electrical Conditioning
C.6 Repetition Tests
C.6.1 General
C.6.2 Recommended Procedure
C.7 Partial Discharge Detection Method
C.7.1 Introduction
C.7.2 Conventional Method According to GB/T 7354
C.7.3 VHF/UHF Method
C.7.4 Acoustic Method
C.7.5 Sensitivity Verification of Acoustic and VHF/UHF Method
Annex D (Informative) Calculations Related to an Internal Fault
D.1 Calculation of Pressure Rise Due to an Internal Fault
Annex E (Informative) Information to be Given with Enquiries, Tenders and Orders
E.1 Introduction
E.2 Normal and Special Service Conditions
E.3 Ratings
E.4 Design and Construction
E.5 Bus Ducts
E.6 Circuit-breaker
E.7 Disconnector and Earthing Switch
E.8 Bushing
E.9 Cable Connection
E.10 Transformer Connection
E.11 Current Transformer
E.12 Inductive Voltage Transformer
E.13 Documentation for Enquiries and Tenders
Bibliography
Figure 101 Pressure Coordination
Figure 102 Example of Arrangement of Enclosures and Gas Compartments
Table 101 Reference Table of Service Conditions Relevant to GIS
Table 102 Preferred Rated Insulation Levels for Rated Voltages for Equipment of Range I
Table 103 Preferred Rated Insulation Levels for Rated Voltages for Equipment of Range II
Table 104 Performance Criteria
Table 105 Example of Grouping of Type Tests
Table 106 Test Voltage for Measuring PD Intensity
Table 107 On Site Test Voltages
Table A.101 Switching Impulse Test Conditions above 252 kV
