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.
