1 General
1.1 Scope
This standard specifies requirements for factory-assembled metal-enclosed switchgear and controlgear for alternating current of rated voltages of 3.6kV~40.5kV for indoor and outdoor installation, and for service frequencies up to and including 50 Hz. Enclosures may include fixed and removable components and may be filled with fluid (liquid or gas) to provide insulation.
NOTE 1 Although primarily dedicated to three-phase systems, this standard can also be applied to single-phase or two-phase systems.
This standard defines several types of metal enclosed switchgear and controlgear which differ due to
——the consequences on network service continuity in case of maintenance on the switchgear and controlgear;
——the need and convenience of maintenance of the equipment.
NOTE 2 Safety of an installation results from the design, implementation and coordination of products, installations and operations.
For metal-enclosed switchgear and controlgear containing gas-filled compartments, the design pressure is limited to a maximum of 0.3MPa (relative pressure).
NOTE 3 Gas-filled compartments having a design pressure exceeding 0.3MPa (relative pressure) should be designed and tested in accordance with GB 7674.
Metal-enclosed switchgear and controlgear for special use, for example, in flammable atmospheres, in mines or on board ships, may be subject to additional requirements.
Components contained in metal-enclosed switchgear and controlgear are to be designed and tested in accordance with their various relevant standards. This standard supplements the standards for the individual components regarding their installation in switchgear and controlgear assemblies.
This standard does not preclude that other equipment may be included in the same enclosure. In such a case, any possible influence of that equipment on the switchgear and controlgear is to be taken into account.
NOTE 4 Switchgear and controlgear assemblies having an insulation enclosure are covered by IEC 60466: 1987.
NOTE 5 Metal-enclosed switchgear and controlgear for rated voltages above 40.5kV insulated by ambient air may be covered by this standard taking into account the insulation levels of GB/T 11022-1999.
1.2 Normative References
The following normative documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments (excluding amending errors) 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 edition of the normative document referred to applies.
GB/T 1408.1-1999 Methods of test for electric strength of solid insulating materials-tests at power frequencies (eqv IEC 60243-1: 1988)
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 2423.17-1993 Basic environmental testing procedures for electric and electronic products Part 17 - Test Ka: Salt mist (eqv IEC 60068-2-11: 1981)
GB/T 2900.20-1994 Electrotechnical terminology-High-voltage switchgear (neq IEC 60050 (441), IEC 60056 etc.)
GB 3804-2004 High-voltage alternating-current switches for rated voltage above 3.6 kV and less than 40.5 kV (IEC 60265-1: 1998 MOD)
GB 4208-1993 Degrees of protection provided by enclosure (IP code) (eqv IEC 60529: 1989)
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 11022-1999 Common specifications for high-voltage switchgear and controlgear standards (eqv IEC 60694: 1996)
GB/T 14808-2001 High-voltage alternating current contactors and contactor-based motor-starters (eqv IEC 60470: 1999)
GB 16926-1997 High-voltage alternating current switch-fuse combinations (eqv IEC 60420: 1990)
GB/T 16927.1-1997 Hign voltage test techniques-Part 1: General test requirements (eqv IEC 60060-1: 1989)
IEC 60466:1987 AC insulation-enclosed switchgear and controlgear for rated voltages above 1kv and up to and including 38kv
IEC 60694: 2002 Common specifications for high-voltage switchgear and controlgear standards
IEC 60909-0: 2001 Short-circuit currents in three-phase ac systems-Part 0: Calculation of currents
IEC 61634:1995 High-voltage switchgear and controlgear-Use and handling of sulphur hexafluoride (SF6) in high-voltage switchgear and controlgear
ISO/IEC Guide 51:1999, Safety aspects C Guidelines for their inclusion in standards
2 Normal and Special Service Conditions
Chapter 2 of GB/T 11022-1999 is applicable with the following addition:
Unless otherwise specified in this standard, the metal-enclosed switchgear and controlgear is designed to be used under normal service conditions.
3 Terms and Definitions
For the purposes of this document, the following definitions as well as the definitions of GB/T 2900.20-1994 and GB/T 11022-1999 apply.
3.101
switchgear and controlgear
General term covering switching devices and their combination with associated control, measuring, protective and regulating equipment, also assemblies of such devices and equipment with associated interconnections, accessories, enclosures and supporting structures
3.102
metal-enclosed switchgear and controlgear
Switchgear and controlgear assemblies with an external metal enclosure intended to be earthed and completely assembled, except for external connections
3.103
functional unit (of an assembly)
Part of metal-enclosed switchgear and controlgear comprising all the components of the main circuits and auxiliary circuits that contribute to the fulfilment of a single function
NOTE Functional units may be distinguished according to the function for which they are intended, for example, incoming unit, outgoing unit, etc.
3.104
multi-tier
Two or more functional units arranged vertically within a single enclosure
3.105
transport unit
Part of metal-enclosed switchgear and controlgear suitable for shipment without being dismantled
3.106
enclosure
Part of metal-enclosed switchgear and controlgear providing a specified degree of protection of equipment against external influences and a specified degree of protection against approach to or contact with live parts and against contact with moving parts
3.107
compartment
Part of metal-enclosed switchgear and controlgear enclosed except for openings necessary for interconnection, control or ventilation
Four types of compartments are distinguished, three that can be opened, called accessible (see 3.107.1 to 3.107.3) and one that cannot be opened, called non-accessible (see 3.107.4)
NOTE Compartments are identified according to the main component(s) contained therein, see 5.103.1.
3.107.1
interlock-controlled accessible compartment
Compartment containing high-voltage parts, intended to be opened for normal operation and/or normal maintenance as stated by the manufacturer, in which access is controlled by integral design of the switchgear and controlgear
NOTE Installation, extension, repairing, etc. are not considered as normal maintenance.
3.107.2
procedure-based accessible compartment
Compartment containing high-voltage parts, intended to be opened for normal operation and/or normal maintenance as stated by the manufacturer, in which access is controlled by a suitable procedure combined with locking
NOTE Installation, extension, repairing, etc. are not considered as normal maintenance.
3.107.3
tool-based accessible compartment
Compartment containing high-voltage parts, that may be opened, but not for normal operation and maintenance. Special procedures are required. Tools are necessary for opening
3.107.4
unaccessible compartment
Compartment containing high-voltage parts that must not be opened. Opening may destroy the integrity of the compartment. Clear indication not to open is provided on/by the compartment
