IEC 60137-2017 pdf free.Insulated bushings for alternating voltages above 1 000 V.
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 15 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.
2 NormatIve references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
lEG 60038, IEC standard voltages
IEC 60050-212:2010, International Electrotechnical Vocabulary — Part 212: Electrical insulating solids, liquids and gases
IEC 60059, IEC standard current ratings
IEC 60060-1, High-voltage test techniques — Part 1: General definitions and test requirements
IEC 60068-2-17:1994, Basic environmental testing procedures — Part 2-17: Tests — Test 0: Sealing
3.2 liquid-filled bushing bushing in which the space between the inside surface of the insulating envelope and the solid major insulation is flled with mineral oil or other insulating liquid compound-filled bushing bushing in which the space between the inside surface of the insulating envelope and the solid major insulation is flld 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 flled 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. 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.
Note2 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 3.14).
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.IEC 60137 pdf download.