IEC 60076-5:2006 PDF

Name: IEC 60076-5:2006 — Power transformers - Part 5: Ability to withstand short circuit
SKU: IEC 60076-5:2006
Price: 35 EUR
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Power transformers - Part 5: Ability to withstand short circuit

Название (английский):

IEC 60076-5:2006

Power transformers - Part 5: Ability to withstand short circuit

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 36
Дата публикации:: 7 февраля 2006 г.
Издание:: IEC IS 60076 edition 3 version 1
ICS:: 29.180

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Описание (английский):

Identifies the requirements for power transformers to sustain without damage the effects of overcurrents originated by external short circuits. Describes the calculation procedures used to demonstrate the thermal ability of a power transformer to withstand such overcurrents and both the special test and the theoretical evaluation method used to demonstrate the ability to withstand the relevant dynamic effects.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

IEC 60076-5:2006 - Power transformers - Part 5: Ability to withstand short circuit defines the requirements, calculation methods and test procedures for demonstrating that power transformers can withstand overcurrents caused by external short circuits without damage. It covers both the thermal and dynamic effects of short-circuit currents and applies to transformers within the scope of IEC 60076‑1.

Key concepts in the standard include:

External short circuits (three‑phase, line‑to‑line, double‑earth, line‑to‑earth)

Thermal ability to withstand overcurrents (calculation procedures)

Dynamic effects (special test and theoretical evaluation)

Key Topics and Requirements

Scope of faults: External short circuits are not limited to three‑phase faults; the standard explicitly includes single‑line‑to‑earth and other fault types.

Thermal verification: Procedures for calculating the transformer’s thermal ability to sustain short‑circuit overcurrents (r.m.s. heating effects and permissible winding temperature rises).

Dynamic verification: Methods to demonstrate the ability to withstand electrodynamic forces produced by peak short‑circuit currents - via a special short‑circuit test or theoretical evaluation (see Annex A, informative).

Short‑circuit impedance and system contribution: Guidance on calculating symmetrical short‑circuit currents using transformer short‑circuit impedance plus system impedance; recognized minimum impedances by rated power are tabulated (categories I–III).

Category I: 25 kVA to 2 500 kVA
Category II: 2 501 kVA to 100 000 kVA
Category III: above 100 000 kVA

System short‑circuit apparent power: Default values for short‑circuit apparent power by system voltage are provided where purchaser data are not available (Table 2).

Special application considerations: Low‑impedance regulating transformers, generator/rotating‑machine connections, booster transformers where agreed current limits may apply.

Annex B (informative): Definition of a “similar transformer” for evaluation/acceptance.

Applications and Who Uses It

Transformer manufacturers - design, rating plates, and factory testing to demonstrate short‑circuit withstand capability.

Purchasers and utilities - specifying required short‑circuit withstand levels and system short‑circuit data.

Design and protection engineers - assessing short‑circuit thermal and dynamic effects for system planning and protection coordination.

Test laboratories - conducting special short‑circuit tests and applying theoretical evaluation methods.

Practical uses include specifying transformer impedance, selecting suitable windings and bracing, defining maximum allowed overcurrents for booster units, and validating designs for systems with high fault levels.

Related Standards

IEC 60076‑1 (General)

IEC 60076‑3 (Insulation levels, dielectric tests)

IEC 60076‑8 (Application guide)

IEC 60076‑11 (Dry‑type transformers)

Keywords: IEC 60076-5, power transformers, withstand short circuit, short-circuit impedance, thermal ability, dynamic effects, short-circuit test, transformer design, transformer testing.

IEC 60076-5:2006 PDF

Abstract

Похожие стандарты

Overview

Key Topics and Requirements

Applications and Who Uses It

Related Standards

Технические детали

BS IEC 60076-15:2015

Power transformers - Gas-filled power transformers

BS IEC 60076-8:1997

Power transformers - Application guide

IEC 60076-11:2018

Power transformers - Part 11: Dry-type transformers

26/30564516 DC

BS EN IEC 60076-5 Power transformers - Part 5: Ability to withstand short circuit