AS NZS 60137 pdf download

AS NZS 60137 pdf download.Insulated bushings for alternating voltages above 1000 V (IEC 60137:2017 (ED.7.0) MOD)
1 Scope
This International Standard specifies the characteristics and tests for insulated bushings. This standard is applicable to bushings, as defined in Clause 3, intended for use in electrical apparatus, machinery, transformers, switchgear and installations for three-phase alternating current systems, having highest voltage for equipment above 1 000 V and power frequencies of 1 5 Hz up to and including 60 Hz. Subject to special agreement between purchaser and supplier, this standard may be applied, in part or as a whole, to the following: • bushings used in other than three-phase systems; • bushings for high-voltage direct current systems; • bushings for testing transformers; • bushings for capacitors. Special requirements and tests for transformer bushings in this standard apply also to reactor bushings. This standard is applicable to bushings made and sold separately. Bushings which are a part of an apparatus and which cannot be tested according to this standard should be tested with the apparatus of which they form part.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1 bushing device that enables one or several conductors to pass through a partition such as a wall or a tank, and insulates the conductors from it; the means of attachment (flange or fixing device) to the partition forms part of the bushing Note 1 to entry: The conductor may form an integral part of the bushing or be drawn into the central tube of the bushing. [SOURCE: IEC 60050-471 :2007, 471 -02-01 ] 3.2 liquid-filled bushing bushing in which the space between the inside surface of the insulating envelope and the solid major insulation is filled with mineral oil or other insulating liquid 3.3 compound-filled bushing bushing in which the space between the inside surface of the insulating envelope and the solid major insulation is filled with an insulating compound 3.4 liquid-insulated bushing bushing in which the major insulation consists of mineral oil or another insulating liquid, enclosed by an insulating envelope Note 1 to entry: These bushings are often of an open design which require proper processing after installation in order to avoid trapped air and subsequent partial discharges during testing or in service. 3.5 gas-filled bushing bushing in which the space between the inside surface of the insulating envelope and the solid major insulation is filled with gas (other than ambient air) at atmospheric pressure or higher Note 1 to entry: This definition includes bushings which are intended to form an integral part of gas-insulated equipment, the gas of the equipment being in communication with that of the bushing. 3.6 gas-insulated bushing bushing in which the major insulation consists of gas (other than ambient air) at atmospheric pressure or higher Note 1 to entry: This definition includes bushings which are intended to form an integral part of gas-insulated equipment, the gas of the equipment being in communication with that of the bushing. Note 2 to entry: A bushing which contains solid insulating materials other than the envelope containing the gas (e.g. support for conducting layers or insulating cylinder), is a combined insulation bushing (see 3.1 4). Note 3 to entry: A bushing in which the desired voltage grading is obtained by an arrangement of conducting or semi-conducting layers incorporated in an insulating material (e.g. plastic film) is referred to as a gas insulated capacitance graded bushing.3.7 gas-impregnated bushing bushing in which the major insulation consists of a core wound from paper or plastic film (GIF) and subsequently treated and impregnated with gas (other than ambient air) at atmospheric pressure or higher Note 1 to entry: the core is contained in an insulating envelope. The space between the core and the insulating envelope being filled with the same gas as used for the impregnation. 3.8 oil-impregnated paper bushing OIP bushing in which the major insulation consists of a core wound from paper and subsequently treated and impregnated with an insulating liquid, generally mineral oil Note 1 to entry: The core is contained in an insulating envelope, the space between the core and the insulating envelope being filled with the same insulating liquid as that used for impregnation.