1. General
1.1 Scope
This national standard is applicable to both indoor and outdoor AC high-voltage switchgears and controlgears that work in the power system of over 3kV voltage and less than 50Hz frequency.
Unless otherwise stated in the high-voltage switchgear and controlgear product standards, this national standard is applicable to all the high-voltage switchgears and controlgears.
1.2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of the Specifications. For dated reference, subsequent amendments (excluding amending error in the text) to, or revisions of, any of these publications do not apply. However, the parties whose enter into agreement according to the Specifications are encouraged to research whether the latest editions of these references are applied or not. For undated references, the latest edition of the normative document is applicable to this standard.
GB 156-1993 Standard Voltage (neq IEC 38: 1983)
GB 311.1-1997 Insulation Coordination for High-voltage Transmit and Transform Equipment (neq IEC 71-1: 1993)
GB/T 311.7-1988 Application Guidance of Insulation Coordination for High-voltage Transmit and Transform Equipment
GB/T 762-1996 Standard Electrical Current (eqv IEC 59:1938)
GB 1984-1989 AC High-voltage Breaker (eqv IEC 56: 1987)
GB 2536-1991 Transformer Oil
GB/T 2423.23-1995 Environmental Testings for Electric and Electronic Products - Test Q: Sealing (neq ICE 68-2-17: 1978)
GB/T 2423.44-1995 Environmental Testings for Electric and Electronic Products - Part 2: Test Methods - Test E: Impact Spring Hammer (neg ICE 68-2-63:1991)
GB/T 2900.1-1992 Electric Terminology - Basic Terminology (neq IEC 50)
GB/T 2900.18- 1992 Electric Terminology - Low-voltage Apparatus (eqv IEV50-441:1984)
GB/T 2900.19-1994 Electric Terminology - High-voltage Test Technology and Insulation Coordination (neg IEC 71, ICE 60, IEC 50)
GB/T 2900.20-1994 Electric Terminology - High-voltage Switchgears (neq IEC 50)
GB/T 4208-1993 Shielding Protection Ratings (IP Code) (eqv IEC 529:1989)
GB/T 4585.2- 1991 Artificial Squalidity Test Methods for AC System's High-voltage Insulator - Solid Lamination Method (eqv IEC 507:1975)
GB/T 4728.1-1985 General Rules of Graphical Symbols for Electrical Diagrams (neq IEC 617- 1:1985)
GB/T 4796 - 1984 Environmental Parameter Classification and Asperity Classification for Electric and Electronic Products (idt IEC 721- 1:1981)
GB/T 4797.4- 1989 Natural Environmental Conditions for Electric and Electronic Products - Solar Radiation and Temperature
GB/T 4797.5- 1992 Natural Environmental Conditions for Electric and Electronic Products - Rainfall Precipitation and Wind (neq IEC 721-2-2:1988)
GB/T 4798.3- 1990 Application Environment Conditions for Electric and Electronic Products - Fixed Application in Locations Equipped with Climatic Protection
GB/T 4798.4-1990 Application Environment Conditions for Electric and Electronic Products - Fixed Application in Locations Equipped with no Climatic Protection (neq IEC 721-3-4)
GB/T 4824- 1996 Measurement Methods and Limitation of Industrial, Scientific and Medical (ISM) for the Electromagnetic Disturbance Characteristics of Radio Frequency (neq IEC CISPR 11:1990 [second edition])
GB/T 5465.2-1996 Graphic Symbols for Electrical Equipment (idt IEC 417:1994)
GB/T 5582-1993 External Insulation Squalidity Ratings for High-voltage Electric Equipment (neq IEC 815:1986, IEC 507:1991)
GB/T 7354- 1987 Partial Discharge Measurement (neq IEC 270:1981)
GB 8287.1-1998 High-voltage Column Porcelain Insulator - Part 1: Technical Conditions (neq IEC 168:1994)
GB/T 8905-1996 Guide Rules of Gas Management and Inspection for Sulfur Hexafluoride Electrical Equipment (neq IEC 480:1974)
GB/T 11021-1989 Heat Resistance Assessment and Classification of Electrical Insulation (eqv IEC 85:1984)
GB/T 11604- 1989 Radio Disturbance Testing Methods for High-voltage Electrical Equipment (eqv IEC 18:1983)
GB 12022- 1989 Industrial Sulfur Hexafluoride (neq IEC 376:1971, 376a:1973, 376b:1974)
GB/T 13540- 1992 Antiseismic Performance Test of High-voltage Switchgears
GB/T 14598.3- 1993 Electric Relay Device - Part 5: Insulation Tests for Electric Relay Device (eqv IEC 255- 5:1977)
GB/T 16927.1- 1997 High-voltage Test Technologies - Part 1: General Test Requirements (eqv IEC 60- 1:1989)
GB/T 17626.4- 1998 Electromagnetic Compatibility - Test and Measurement Technologies - Immunity Test for Electric Ringing Pulse Group ( idt IEC 61000-4- 4:1995)
GB/T 17626.12- 1998 Electromagnetic Compatibility - Test and Measurement Technologies - Immunity Test for Oscillatory Waves (idt IEC 61000-4- 12:1996)
GB/T 17627.1-1998 High-voltage Test Technologies for Low-voltage Electrical Equipment - Part 1: Definitions and Test Requirements (eqv IEC 1180- 1:1994)
JB/T 5895- 1991 Application Guide for Insulators Used in Squalid Regions (neq IEC 815)
IEC 816:1984 Guide on methods of Measurement of Short Duration Transients on Low-voltage Power and Signal Lines
IEC 1634: 1995 High-voltage Switchgears and Controlgears - Use and Handling of Sulphur Hexafluoride
CISPR 16-1: 1993 Specifications for Radio Disturbance and Immunity Measuring Apparatus - Part 1: Radio Disturbance and Measurement and Immunity Measuring Apparatus
Other international standards adopted in this national standard are listed in Annex G.
2. Normal and Particular Use Conditions
Unless otherwise specified, the high-voltage switchgear and controlgear as well as their driving mechanism and accessories shall be used under their rated performances and the normal operating conditions stated in 2.1.
In case that the actual use conditions are different from the particular use conditions, the high-voltage switchgear, controlgear as well as their driving mechanism and accessories shall be designed according to special requirement from users as possible or an agreement shall be reached with the user (see 2.2).
Note:
1. Furthermore, proper measures shall be taken to guarantee other components, like the relay, can work normally under these conditions.
2. For detailed environmental condition classifications, please refer to GB/T 4798.3 and 4798.4.
2.1 Normal Use Conditions
2.1.1 Indoor Switchgear and Controlgear
A) The ambient air temperature shall not exceed 40℃ and the average within 24h shall not exceed 35℃.
The lowest ambient air temperature for the "- five doors" shall be -5℃, for the "- 15 doors" shall be -15℃ and for the "- 25 doors" shall be -25℃.
B) The influence from the sun radiation can be negligible.
C) The elevation shall not exceed 1000m.
D) The ambient air shall have no evident pollution from dust, fume, corrosive and/or flammable gases, vapor or smoke.
E) Humidity conditions are as follows:
--- the average relative humidity within 24h shall not exceed 90%;
--- the average vapor pressure within 24h shall not exceed 2.2kPa;
--- the average relative humidity monthly shall not exceed 90%;
--- the average vapor pressure monthly shall not exceed 1.8kPa.
Under such conditions, condensation may happen.
Note:
1. The sudden change of temperatures during the high-humidity period may cause condensation.
2. To resist the effect, like the insulation breakdown or metalwork erosion, caused by the high humidity and condensation, the switchgear designed for these conditions and tested according to these conditions shall be used.
3. Buildings or booths specially designed shall be adopted. In the transformer substation, proper ventilation and heating measures shall be adopted or the moisture-removal devices shall be adopted to prevent the formation of condensation.
F) The external vibration or ground movement of the switchgear and the controlgear are negligible.
G) In the secondary system, the amplitude value of the inductive electromagnetic interference shall not exceed 1.6kV.
