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IEC

JWG 7 - TC 36/SC 36A/JWG 7

TC 36/SC 36A/JWG 7

General Information

Status
Active
Work Field
Information technology
Parent
SC 36A - Insulated bushings

Frequently Asked Questions

JWG 7 is a Technical Committee within the International Electrotechnical Commission (IEC). It is named "TC 36/SC 36A/JWG 7". This committee has published 33 standards.

JWG 7 develops IEC standards in the area of Information technology. Currently, there are 33 published standards from this technical committee.

The International Electrotechnical Commission (IEC) is the world's leading organization for the preparation and publication of international standards for electrical, electronic, and related technologies. Founded in 1906, the IEC provides a global platform for companies, industries, and governments to meet, discuss, and develop the international standards they require.

A Technical Committee (TC) in IEC is a group of experts responsible for developing international standards in a specific technical area. TCs are composed of national member body delegates and work through consensus to create standards that meet global industry needs. Each TC may have subcommittees (SCs) and working groups (WGs) for specialized topics.

Standardization Organization
ICS
Directive
Mandate
50
IEC
IEC TS 63493-1:2025(Main)
Transformer bushings dimensional standardization - Part 1: Medium voltage bushings with Um from 12 kV up to and including 52 kV and Ir from 630 A up to and including 3 150 A

IEC TS 63493-1:2025 specifies the main parameters to facilitate interchangeability or at least to define some frame conditions of MV bushings:
- with Um from 12 kV up to and including 52 kV;
- Ir from 630 A up to and including 3 150 A.
This document deals with non-capacitance graded bushings for Power Transformers, according to the IEC 60076 series (usually for transformer with conservator).
In this document only liquid to air bushings are considered. Bushings of liquid-to-liquid and air-to-air type and bushings for transformers with air-cushion in tank are not considered.
MV is considered up to 52 kV; this value is used to cover specific insulation levels or for high pollution levels, even if the field of application is very restricted.
Both solutions with external insulation in porcelain and polymeric can be used and need to enable interchangeability (in terms of mechanical and electrical performance).

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