IEC/TC 98 - IEC_TC_98

Specifies a general test procedure for the thermal evaluation and qualification of electrical insulation systems (EIS) and establishes a procedure that compares the performance of a candidate EIS to that of a reference EIS. This basic standard is applicable to existing or proposed EIS used in electrotechnical products with an input voltage of up to 1 000 V where the thermal factor is the dominating ageing factor. This second edition cancels and replaces the first edition published in 1998, and constitutes a technical revision to make this basic standard compatible with parts 21 and 22.

Lists the required test procedures for qualification of modifications of an established electrical insulation system (EIS) with respect to its thermal classification. This standard is applicable to EIS used in wire-wound electrotechnical devices. The test procedures are comparative in that the performance of a candidate EIS is compared to that of a reference EIS, which has proven service experience in accordance with EN 60791 or has been evaluated by one of the procedures given in the EN 61857 series. This second edition cancels and replaces the first edition, published in 1999, and constitutes a technical revision that incorporates test procedures referenced in EN 60034-18-22.

Establishes the basis for estimating the ageing of electrical insulation systems (EIS) under conditions of either electrical, thermal, mechanical, environmental stresses or combinations of these (multifactor stresses). It specifies the principles and procedures that should be followed, during the development of EIS functional test and evaluation procedures, to establish the estimated service life for a specific EIS. The main changes with respect to the previous edition concern the amalgamation of the following standards, which, with the exception of EN 60727-1, will be withdrawn when this third edition is published: EN 60791:1984, Performance evaluation of insulation systems based on experience and functional tests EN 60792-1:1985, The multi-factor functional testing of electrical insulation systems - Part 1: Test procedures EN 60941:1988, Mechanical endurance functional tests for electrical insulation systems EN 61356:1995, Functional evaluation of electrical systems - Principles for test procedures when comparative testing is not feasible EN 61359:1995, Evaluation and identification of electric insulation systems - Environment evaluation EN 60727-1: 1982, Evaluation of electrical endurance of electrical insulation systems - Part 1: General considerations and evaluation procedures based on normal distributions Elements of EN 60727-1 that are not amalgamated will be considered in the next edition of that standard.

Describes a general-purpose model (GPM) and a tall channel alternative model (GPM-TC) which can be used for the evaluation of wire-wound EIS where specific electrotechnical products are not available or required. This edition constitutes a technical revision by merging Part 23 into Part 21.

applies to electrical equipment, regardless of voltage, containing an insulation system, which is - connected to an electronic power supply, and - requires an evaluation of insulation endurance under repetitive voltage impulses. This standard proposes a general test procedure to facilitate screening of electrical insulation systems (EIS) and to achieve a relative evaluation of insulation endurance under conditions of repetitive impulses.

Specifies a general-purpose, tall-channel model (GPM-TC) which can be used for the evaluation of wire-wound electrical insulation systems (EIS) where the general-purpose model (GPM) defined in EN 61857-21 does not offer sufficient space for the electrical insulating materials (EIM) and/or winding wire to be evaluated.

Specifies an encapsulated-coil model (ECM) that can be used for the evaluation of encapsulated wire-wound EIS.

Establishes the thermal classification of an electrical insulation system (EIS). It also identifies recognized procedures for the thermal evaluation of EIS. This standard is applicable to EIS used in electrotechnical devices where the thermal factor is the dominating ageing factor.

Establishes the basis for estimating the ageing of electrical insulation systems (EIS) under conditions of either electrical, thermal, mechanical, environmental or multifactor stresses. It specifies the principles and procedures that should be followed, during the development of EIS functional test and evaluation procedures, to establish the service life for a specific insulation system.

Lists the required test procedures for qualification of modifications of an established electrical insulation system (EIS) with respect to its thermal classification. Applicable to EIS used in wire-wound electrotechnical devices with input voltage up to 1000 V. The test procedures are comparative in that the performance of a candidate EIS is compared to that of a reference EIS, which has proven service experience in accordance with EN 60791 or has been evaluated by one of the procedures given in IEC 61857 series.

Specifies a general test procedure for the thermal evaluation and qualification of electrical insulation systems (EIS) and establishes a procedure that compares the performance of a candidate EIS to that of a reference EIS. Is applicable to existing or proposed EISs used in electrotechnical products with an input voltage of up to 1 000 V where the thermal factor is the dominating ageing factor.

This general purpose model (GPM) can be used for the evaluation of wire-wound electrical insulation systems where specific electrotechnical products are not available or required.