Insulation co-ordination - Part 1: Definitions, principles and rules

IEC 60071-1:2006 applies to three-phase a.c. systems having a highest voltage for equipment above 1 kV. It specifies the procedure for the selection of the rated withstand voltages for the phase-to-earth, phase-to-phase and longitudinal insulation of the equipment and the installations of these systems. It also gives the lists of the standard withstand voltages from which the rated withstand voltages should be selected. This standard recommends that the selected withstand voltages should be associated with the highest voltage for equipment. This association is for insulation co-ordination purposes only. The requirements for human safety are not covered by this standard. Although the principles of this standard also apply to transmission line insulation, the values of their withstand voltages may be different from the standard rated withstand voltages. The apparatus committees are responsible for specifying the rated withstand voltages and the test procedures suitable for the relevant equipment taking into consideration the recommendations of this standard. NOTE: In IEC 60071-2, Application Guide, all rules for insulation co ordination given in this standard are justified in detail, in particular the association of the standard rated withstand voltages with the highest voltage for equipment. When more than one set of standard rated withstand voltages is associated with the same highest voltage for equipment, guidance is provided for the selection of the most suitable set. The main changes from the previous edition are as follows:  - in the definitions (3.26, 3.28 and 3.29) and in the environmental conditions (5.9) taken into account clarification of the atmospheric and altitude corrections involved in the insulation co-ordination process;  - in the list of standard rated short-duration power frequency withstand voltages reported in 5.6 addition of 115 kV;  - in the list of standard rated impulse withstand voltages reported in 5.7, addition of 200 kV and 380 kV; - in the standard insulation levels for range I (1kV < Um   245 kV) (Table 2) addition of the highest voltage for equipment Um = 100 kV; - in the standard insulation levels for range II (Um   245 kV) (Table 3) replacement of 525 kV by 550 kV and of 765 kV by 800 kV; - in order to remove that part in the next revision of IEC 60071-2, addition of Annex A dealing with clearances in air to assure a specified impulse withstand voltage in installation; - in Annex B, limitation at two Um values for the values of rated insulation levels for 1kV < Um 245 kV for highest voltages for equipment Um not standardized by IEC based on current practice in some countries.
It has the status of a horizontal standard in accordance with IEC Guide 108.

Coordination de l'isolement - Partie 1: Définitions, principes et règles

La CEI 60071-1 s'applique aux réseaux à tension alternative triphasée dont la tension la plus élevée pour le matériel est supérieure à 1 kV. Elle spécifie la procédure pour le choix des tensions de tenue assignées normalisées pour l'isolation phase-terre, l'isolation entre phases et l'isolation longitudinale du matériel et des installations de ces réseaux. Elle donne également les listes des valeurs normalisées parmi lesquelles il convient de choisir les tensions de tenue assignées normalisées. Cette norme recommande que les tensions de tenue choisies soient associées aux tensions les plus élevées pour le matériel. Cette association est destinée aux seules fins de la coordination de l'isolement. Les exigences concernant la sécurité des personnes ne sont pas couvertes par cette norme. Bien que les principes de cette norme s'appliquent également à l'isolation des lignes de transport d'énergie, les valeurs des tensions de tenue peuvent être différentes des tensions de tenue assignées normalisées. Il appartient aux comités de produits de spécifier les tensions de tenue et les procédures d'essai appropriées aux matériels correspondants, en prenant les recommandations de cette norme en considération. NOTE: Toutes les règles pour la coordination de l'isolement données dans cette norme sont justifiées en détail dans la CEI 60071-2, en particulier en ce qui concerne l'association des tensions de tenue assignées normalisées avec les tensions les plus élevées pour le matériel. Lorsque plusieurs séries de tensions de tenue assignées normalisées sont associées à la même valeur de la tension la plus élevée pour le matériel, une ligne directrice est donnée pour le choix de la série la plus appropriée. Les principaux changements par rapport à l'édition précédente sont ceux qui suivent: - dans les définitions (3.26, 3.28 et 3.29) et dans les conditions environnementales (5.9) prises en compte, clarification des corrections atmosphérique et d'altitude impliquées dans le processus de coordination de l'isolement; - dans la liste des tensions de tenue assignées normalisées de courte durée à fréquence industrielle mentionnées en 5.6, introduction de 115 kV; - dans la liste des tensions de tenue assignées normalisées aux chocs indiquées en 5.7, introduction de 200 kV et 380 kV; dans les niveaux de tenue normalisés pour la gamme I (1kV < Um   245 kV) (Tableau 2), introduction de la tension la plus élevée pour le matériel Um = 100 kV; - dans les niveaux de tenue normalisés pour la gamme II (Um   245 kV) (Tableau 3) remplacement de 525 kV par 550 kV et de 765 kV par 800 kV; - afin de supprimer cette partie dans la révision prochaine de la CEI 60071-2, introduction de l'Annexe A relative aux distances dans l'air pour installation avec tension de tenue aux chocs spécifiée; - dans l'Annexe B, limitation à deux valeurs de Um pour les valeurs de niveaux d'isolement assignés pour 1 kV < Um   245 kV pour des tensions les plus élevées pour le matériel Um non normalisées par la CEI, fondées sur la pratique existant dans certains pays.
Elle a le statut d'une norme horizontale conformément au Guide 108 de la CEI.

Insulation co-ordination - Part 1: Definitions, principles and rules

General Information

Status
Not Published
ICS
29.080.30 - Insulation systems
Technical Committee
ISO/IEC JTC 1/SC 28 - Office equipment
Current Stage
PPUB - Publication issued
Start Date
23-Jan-2006
Ref Project
SIST IEC 60071-1:1996 - Insulation co-ordination - Part 1: Definitions, principles and rules

Overview

IEC 60071-1 - Insulation co‑ordination: Part 1: Definitions, principles and rules is the international standard that defines the principles and rules for selecting rated withstand voltages in three‑phase a.c. systems with equipment highest voltage above 1 kV. The standard specifies how to associate standard rated withstand voltages with the highest voltage for equipment (Um) for insulation co‑ordination purposes. It is a horizontal IEC standard (IEC Guide 108) and complements IEC 60071-2 (Application Guide), which provides detailed justification and selection guidance.

Key topics and requirements

  • Scope: Applies to three‑phase a.c. systems with Um > 1 kV; does not cover human safety requirements.
  • Voltage selection procedure: Procedure for selecting rated withstand voltages for:
    • Phase‑to‑earth insulation
    • Phase‑to‑phase insulation
    • Longitudinal insulation of equipment and installations
  • Standard rated withstand voltages: Lists of standard short‑duration power‑frequency and impulse withstand voltages from which the rated values should be selected; recent editions added specific values (e.g., 115 kV for short‑duration power frequency; 200 kV and 380 kV for impulse).
  • Association with Um: Recommends associating selected withstand voltages with the highest voltage for equipment for insulation co‑ordination only.
  • Environmental corrections: Clarifies atmospheric and altitude corrections to be applied in insulation co‑ordination.
  • Insulation level updates: Adjustments to standard insulation levels and Um entries (addition of Um = 100 kV in one range; replacement of some high Um values).
  • Annexes: Addition of Annex A (clearances in air to assure specified impulse withstand voltages) and Annex B (limitations for rated insulation levels for some non‑standard Um values).
  • Responsibility: Apparatus committees must specify rated withstand voltages and appropriate test procedures for specific equipment, taking IEC 60071-1 recommendations into account.
  • Transmission lines: Principles apply but transmission line withstand values may differ from listed standard rated voltages.

Applications and users

IEC 60071-1 is essential for:

  • Electrical engineers and designers of substations, switchgear, transformers and high‑voltage equipment
  • Manufacturers creating specifications and test requirements for insulation systems
  • Utilities and system planners performing insulation co‑ordination studies
  • Standards committees and test laboratories defining rated withstand voltages and test methods

Practical uses include selecting insulation levels, defining clearances, specifying test voltages, and harmonizing equipment ratings for reliable system performance.

Related standards

  • IEC 60071-2 (Application Guide) - provides detailed justification and selection guidance for rules in IEC 60071-1
  • Equipment‑specific IEC standards - apparatus committees set final rated withstand voltages and test procedures consistent with IEC 60071-1 recommendations

Keywords: IEC 60071-1, insulation co‑ordination, rated withstand voltages, phase‑to‑earth, phase‑to‑phase, impulse withstand voltage, short‑duration power‑frequency, highest voltage for equipment, insulation levels.

Frequently Asked Questions

IEC 60071-1 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Insulation co-ordination - Part 1: Definitions, principles and rules". This standard covers: IEC 60071-1:2006 applies to three-phase a.c. systems having a highest voltage for equipment above 1 kV. It specifies the procedure for the selection of the rated withstand voltages for the phase-to-earth, phase-to-phase and longitudinal insulation of the equipment and the installations of these systems. It also gives the lists of the standard withstand voltages from which the rated withstand voltages should be selected. This standard recommends that the selected withstand voltages should be associated with the highest voltage for equipment. This association is for insulation co-ordination purposes only. The requirements for human safety are not covered by this standard. Although the principles of this standard also apply to transmission line insulation, the values of their withstand voltages may be different from the standard rated withstand voltages. The apparatus committees are responsible for specifying the rated withstand voltages and the test procedures suitable for the relevant equipment taking into consideration the recommendations of this standard. NOTE: In IEC 60071-2, Application Guide, all rules for insulation co ordination given in this standard are justified in detail, in particular the association of the standard rated withstand voltages with the highest voltage for equipment. When more than one set of standard rated withstand voltages is associated with the same highest voltage for equipment, guidance is provided for the selection of the most suitable set. The main changes from the previous edition are as follows: - in the definitions (3.26, 3.28 and 3.29) and in the environmental conditions (5.9) taken into account clarification of the atmospheric and altitude corrections involved in the insulation co-ordination process; - in the list of standard rated short-duration power frequency withstand voltages reported in 5.6 addition of 115 kV; - in the list of standard rated impulse withstand voltages reported in 5.7, addition of 200 kV and 380 kV; - in the standard insulation levels for range I (1kV < Um 245 kV) (Table 2) addition of the highest voltage for equipment Um = 100 kV; - in the standard insulation levels for range II (Um 245 kV) (Table 3) replacement of 525 kV by 550 kV and of 765 kV by 800 kV; - in order to remove that part in the next revision of IEC 60071-2, addition of Annex A dealing with clearances in air to assure a specified impulse withstand voltage in installation; - in Annex B, limitation at two Um values for the values of rated insulation levels for 1kV < Um 245 kV for highest voltages for equipment Um not standardized by IEC based on current practice in some countries.<br /> It has the status of a horizontal standard in accordance with IEC Guide 108.

IEC 60071-1:2006 applies to three-phase a.c. systems having a highest voltage for equipment above 1 kV. It specifies the procedure for the selection of the rated withstand voltages for the phase-to-earth, phase-to-phase and longitudinal insulation of the equipment and the installations of these systems. It also gives the lists of the standard withstand voltages from which the rated withstand voltages should be selected. This standard recommends that the selected withstand voltages should be associated with the highest voltage for equipment. This association is for insulation co-ordination purposes only. The requirements for human safety are not covered by this standard. Although the principles of this standard also apply to transmission line insulation, the values of their withstand voltages may be different from the standard rated withstand voltages. The apparatus committees are responsible for specifying the rated withstand voltages and the test procedures suitable for the relevant equipment taking into consideration the recommendations of this standard. NOTE: In IEC 60071-2, Application Guide, all rules for insulation co ordination given in this standard are justified in detail, in particular the association of the standard rated withstand voltages with the highest voltage for equipment. When more than one set of standard rated withstand voltages is associated with the same highest voltage for equipment, guidance is provided for the selection of the most suitable set. The main changes from the previous edition are as follows: - in the definitions (3.26, 3.28 and 3.29) and in the environmental conditions (5.9) taken into account clarification of the atmospheric and altitude corrections involved in the insulation co-ordination process; - in the list of standard rated short-duration power frequency withstand voltages reported in 5.6 addition of 115 kV; - in the list of standard rated impulse withstand voltages reported in 5.7, addition of 200 kV and 380 kV; - in the standard insulation levels for range I (1kV < Um 245 kV) (Table 2) addition of the highest voltage for equipment Um = 100 kV; - in the standard insulation levels for range II (Um 245 kV) (Table 3) replacement of 525 kV by 550 kV and of 765 kV by 800 kV; - in order to remove that part in the next revision of IEC 60071-2, addition of Annex A dealing with clearances in air to assure a specified impulse withstand voltage in installation; - in Annex B, limitation at two Um values for the values of rated insulation levels for 1kV < Um 245 kV for highest voltages for equipment Um not standardized by IEC based on current practice in some countries.<br /> It has the status of a horizontal standard in accordance with IEC Guide 108.

IEC 60071-1 is classified under the following ICS (International Classification for Standards) categories: 29.080.30 - Insulation systems. The ICS classification helps identify the subject area and facilitates finding related standards.

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Standards Content (Sample)


SLOVENSKI STANDARD
01-junij-1996
Insulation co-ordination - Part 1: Definitions, principles and rules
Insulation co-ordination - Part 1: Definitions, principles and rules
Coordination de l'isolement - Partie 1: Définitions, principes et règles
Ta slovenski standard je istoveten z: IEC 60071-1
ICS:
29.080.01 (OHNWULþQDL]RODFLMDQD Electrical insulation in
VSORãQR general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
...

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IEC 60071-1 is a standard that applies to three-phase AC systems with a highest voltage for equipment above 1kV. The standard specifies the procedure for selecting rated withstand voltages for insulation of equipment and installations in these systems. The standard recommends that the selected withstand voltages be associated with the highest voltage for equipment for insulation coordination purposes. However, it does not cover requirements for human safety. The standard also applies to transmission line insulation, but the withstand voltages may be different. The responsibility for specifying rated withstand voltages and test procedures lies with the apparatus committees. The article also highlights changes made in the updated version of the standard.

기사 제목: IEC 60071-1 - 절연 조율 - 파트 1: 정의, 원칙 및 규칙 기사 내용: IEC 60071-1:2006은 장비용 최고전압이 1kV를 초과하는 3상 교류 시스템에 적용됩니다. 이 표준은 장비 및 설치의 단상-지상, 단상-단상 및 종방향 절연에 대한 등급 견뎌 내압을 선택하는 절차를 명시합니다. 또한 등급 견뎌 내압이 선택될 때는 규정된 등급 견뎌 내압 목록에서 선택되어야 합니다. 이 표준은 선택된 견뎌 내압이 절연 조율 목적으로만 사용되어야 함을 권장합니다. 이 규격은 인간의 안전에 대한 요구 사항은 다루지 않습니다. 이 표준은 전력선 절연에도 적용되지만, 내압 값은 표준 등급 견뎌 내압과 다를 수 있습니다. 장비 위원회는 이 표준의 권장을 고려하여 적합한 장비에 대한 등급 견뎌 내압과 시험 절차를 명시하는 책임을 가지고 있습니다. 참고: IEC 60071-2, 응용 가이드에서 이 표준의 절연 조율에 대한 모든 규칙은 자세히 정당화되며, 특히 표준 등급 견뎌 내압과 장비의 최고전압의 관련을 가져옵니다. 최고전압에 여러 개의 표준 등급 견뎌 내압 세트가 관련된 경우에는 가장 적합한 세트를 선택하기 위한 안내가 제공됩니다. 이전 판과의 주요 변경 사항은 다음과 같습니다: 정의(3.26, 3.28 및 3.29) 및 환경 조건(5.9)에서 절연 조율 프로세스에 관련된 대기 및 고도 수정 사항을 고려한 변경; 5.6에 보고된 표준 등급 단시간 전력 주파수 견뎌 내압 목록에 115 kV 추가; 5.7에 보고된 표준 등급 입발견뎌 내압 목록에 200 kV 및 380 kV 추가; 범위 I(1kV < Um ≤ 245kV)용 표준 절연 수준(표 2)에 장비의 최고전압인 Um = 100 kV 추가; 범위 II(Um ≥ 245 kV)용 표준 절연 수준(표 3)에 525 kV를 550 kV로 대체하고, 765 kV를 800 kV로 대체; 설치 내에서 지정된 입발견뎌 내압을 보장하기 위한 공기의 여유에 대한 부록 A 추가를 위해 IEC 60071-2의 다음 개정에서 해당 부분을 제거하기 위해 추가; 국내 일부 국가의 현재 관행을 기반으로 IEC에서 표준화되지 않은 장비의 최고 전압 Um에 대한 1kV < Um ≤ 245kV의 등급 절연 수준 값에 대해 Um 값 제한함을 위해 부록 B에 추가. IEC Guide 108에 따라 수평 규격의 지위를 갖습니다.

記事のタイトル：IEC 60071-1 - 絶縁調和- 部分 1：定義、原則、および規則 記事の内容：IEC 60071-1:2006は、機器の最高電圧が1 kVを超える3相交流システムに適用されます。この規格は、機器およびシステムの単相-接地、単相-単相、および延長絶縁のための定格耐圧を選択する手順を指定しています。また、選択した耐圧は、絶縁調和の目的にのみ関連付けられるべきであり、人間の安全性に関する要件は対象外です。この規格は送電線絶縁にも適用されますが、耐圧値は標準の定格耐圧と異なる場合があります。耐圧値および試験手順の指定は、機器委員会が責任を持ち、この規格の推奨事項を考慮に入れて行います。注：IEC 60071-2のアプリケーションガイドでは、この規格の絶縁調和に関するすべてのルールが詳細に正当化されており、特に標準の定格耐圧と最高電圧の関連を含んでいます。同じ最高電圧に対して複数の標準の定格耐圧が関連付けられている場合、最適なセットを選択するためのガイダンスが提供されます。前版からの主な変更点は以下のとおりです：規定（3.26、3.28、および3.29）、および環境条件（5.9）の定義を考慮した絶縁調和プロセスに関する大気および高度の修正の明確化を考慮した修正; 5.6に報告された標準の定格短時間定格耐力電圧リストに115 kVの追加; 5.7に報告された標準の定格インパルス耐圧リストに200 kVおよび380 kVの追加; 範囲I（1 kV < Um ≤ 245 kV）の標準絶縁レベル（表2）に最高電圧機器Um = 100 kVの追加; 範囲II（Um ≥ 245 kV）の標準絶縁レベル（表3）に525 kVを550 kVに、および765 kVを800 kVに置き換える; 次のIEC 60071-2の改訂には削除されるようにするため、取り付けにおける指定されたインパルス耐圧を確保するための空気のクリアランスに関する付録Aの追加; B付録では、現行の一部の国の慣行に基づき、IECで標準化されていない最高電圧の機器Umに対して1 kV < Um ≤ 245 kVの定格絶縁レベル値のUm値制限の追加。IECガイド108に従い、水平規格の地位を持っています。