1.1Scope
This standard applies to alternating current disconnectors and earthing switches, designed for indoor and outdoor enclosed and open terminal installations for rated voltages 3,000 V or above and for service frequencies of 50 Hz.
It also applies to the operating mechanisms of these disconnectors and earthing switches and their auxiliary equipment.
Additional requirements for disconnectors and earthing switches in enclosed switchgear and controlgear are given in GB 3906, GB 7674 and IEC 62271-201.
Note: disconnectors in which the fuse forms an integral part are not covered by this standard.
1.2Normative References
The following documents are indispensable for the application of this standard. For dated references, only the dated edition is applicable to this document. For undated references, the latest editions of the normative documents (including all the amendments) are applicable to this document.
GB 311.1-2012 Insulation Coordination - Part 1: Definitions, Principles and Rules(IEC 60071-1:2006+A1:2012, MOD)
GB/T 311.2-2013 Insulation Co-ordination-Part 2: Application Guide(IEC 60071-2:1996, MOD)
GB/T 1804-2000 General Tolerances - Tolerances for Linear and Angular Dimensions without Individual Tolerance Indications(eqv ISO 2768-1:1989)
GB 1984-2014 High-voltage Alternating-current Circuit-breakers(IEC 62271-100:2008, MOD)
GB/T 2900.20-1994 Electrotechnical Terminology-High-voltage Switchgear (neq IEC 60050)
GB 3906-2006 Alternating-current Metal-enclosed Switchgear and Controlgear for Rated Voltages Above 3.6 kV and Up to and Including 40.5 kV(IEC 62271-200:2003, MOD)
GB/T 4109-2008 Insulated Bushings for Alternating Voltages above 1 000V(IEC 60137 Ed.6.0, MOD)
GB 4208-2008 Degrees of Protection Provided by Enclosure (IP Code)(IEC 60529:2001, IDT)
GB/T 4473-2008 Synthetic Testing of High-voltage Alternating Current Circuit-breakers(IEC 62271-101:2006, MOD)
GB/T 7354-2003 Partial Discharge Measurements(IEC 60270:2000, IDT)
GB 7674-2008 Gas-insulated Metal-enclosed Switchgear for Rated Voltages of 72.5kV and Above(IEC 62271-203:2003, MOD)
GB/T 11022-2011 Common Specifications for High-voltage Switchgear and Controlgear Standards(IEC 62271-1:2007, MOD)
GB/Z 24837-2009 Specification for 1100 kV Alternating-current Disconnectors and Earthing Switches
GB/T 26218 (All Parts) Selection and Dimensioning of High-voltage Insulators Intended for Use in Polluted Conditions (IEC/TS 60815, MOD)
IEC 60865-1:1993 Short-circuit Currents-calculation of Effects-Part 1:Definitions and Calculation Methods
IEC 62271-201:2006 High-voltage Switchgear and Controlgear-Part 201: AC Insulation-enclosed Switchgear and Controlgear for Rated Voltages Above 1 kV and Up to and Including 52 kV
2Normal and Special Service Conditions
Chapter 2 of GB/T 11022-2011 is applicable.
3Terminologies and Definitions
Chapter 3 of GB/T 11022-2011 is applicable with the following addition:
This Chapter covers required definitions, most of them by reference to GB/T2900.20-1994.
3.1
General terms
3.1.101
Indoor switchgear and controlgear
[3.3, GB/T2900.20-1994]
3.1.102
Outdoor switchgear and controlgear
[3.4, GB/T2900.20-1994]
3.1.103
Temperature rise (of a part of a disconnector or earthing switch)
Difference between the temperature of the part and the ambient air temperature
3.1.104
User
Person or legal entity using the disconnectors or earthing switches
Note: this may include the purchaser (for example an electricity supplier), but it may also include the contracting company, the staff responsible for installation, the maintenance or operating staff or anybody else temporarily or permanently responsible for the disconnector, earthing switch or substation, or even the operation of the switchgear.
3.2
Assemblies of switchgear and controlgear
No particular definitions.
3.3
Parts of assemblies
No particular definitions.
3.4
Switching devices
3.4.101
Disconnector
3.24 of GB/T2900.20-1994 is applicable with the following additional notes:
Note 1: "negligible current" implies currents such as the capacitive currents of bushings, buses, connections, very short lengths of cable, currents of permanently connected grading impedances of circuit-breakers and currents of voltage transformers and dividers (see Appendix H). For rated voltages of 363 kV and below, a current not exceeding 0.5 A is a negligible current for the purpose of this definition; for rated voltage above 550 kV and currents exceeding 0.5 A, the manufacturer shall be consulted.
"No significant change in voltage" refers to such applications as the by-passing and bus transfer of induction voltage regulators or circuit-breakers.
Note 2: for a disconnector having a rated voltage of 40.5 kV and above, a rated ability of bus-transfer current switching may be assigned.
3.4.101.1
Disconnector class M0
