IEC TR 60909-2-2008 PDF

Full title and description

Short-circuit currents in three-phase a.c. systems - Part 2: Data of electrical equipment for short-circuit current calculations. This Technical Report compiles typical electrical data (machines, transformers, lines, cables, switchgear, busbars, etc.) and calculation examples to support the numerical application of IEC 60909 short‑circuit calculation methods.

Abstract

IEC TR 60909-2:2008 provides tabulated and representative equipment parameters and practical calculation guidance for use with the IEC 60909 short‑circuit calculation methodology (see IEC 60909-0). It includes data for synchronous machines, transformers (two- and three-winding), autotransformers, overhead lines and cables, busbar configurations and typical reduction factors; it also gives equations for calculating impedances where direct measurement data are unavailable. The report is intended to harmonize input data used in short‑circuit studies and to assist planners, utilities and manufacturers in producing comparable results.

General information

• Status: Published; Technical Report (TR), active/stable until the stability date indicated by IEC.
• Publication date: 13 November 2008.
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 17.220.01, 29.240.20.
• Edition / version: Edition 2.0 (2008).
• Number of pages: 43 pages (PDF base publication listing).

Scope

Provides representative electrical parameters and calculation formulae for equipment commonly encountered in low-, medium- and high-voltage systems so they can be used as input for short‑circuit current calculations carried out according to the procedures of IEC 60909-0. The TR is aimed at planners, system studies engineers and equipment suppliers who need consistent, country-typical or generic data for prospective short‑circuit studies, and includes examples and guidance for calculating impedances of cables and busbar arrangements where manufacturer data are not available.

Key topics and requirements

• Collection of typical data for synchronous machines (sub‑transient and transient reactances, time constants) for a range of ratings and voltages.
• Transformer data (two‑ and three‑winding transformers, autotransformers): rated short‑circuit voltages, reactances and recommended values for different connectivity and tap arrangements.
• Equations and worked examples for positive-, negative- and zero‑sequence impedances of cables (including sheaths/shields) and overhead lines; reduction factors for short‑circuit calculations.
• Busbar configuration impedances and calculation examples for common arrangements.
• Typical data for switchgear and protective device characteristics as required for fault studies (selection guidance rather than product specifications).
• Worked calculation examples illustrating application of the data with the IEC 60909-0 calculation method.

Typical use and users

Used by power system planners, utility engineers, substation and network designers, protection and relay engineers, manufacturers and consultants who perform short‑circuit studies during design, planning and verification of electrical installations. The TR is also used as a reference when manufacturer data are incomplete or when a consistent set of generic values is required for comparative studies.

Related standards

Part of the IEC 60909 family (short‑circuit current calculation guidance). Key related documents include IEC 60909-0 (calculation methods and general definitions), IEC TR 60909-1 (factors for calculation) and IEC 60909-3 (line-to-earth and partial earth‑current calculations). These neighboring parts provide the standardized calculation procedures and additional factors that this TR (Part 2) supplies data to be used with.

Keywords

short‑circuit, IEC 60909, technical report, equipment data, impedance, transformer, synchronous machine, cable impedance, busbar, fault current calculation

FAQ

Q: What is this standard?

A: IEC TR 60909-2:2008 is a Technical Report (Part 2 of the IEC 60909 series) that provides representative electrical equipment data and calculation guidance to be used with the IEC 60909 short‑circuit calculation procedures.

Q: What does it cover?

A: It covers typical parameter values and calculation formulae for generators, motors, transformers (including multi‑winding and autotransformers), overhead lines, cables, busbars and related items; it also includes worked examples showing how to apply those data in short‑circuit calculations.

Q: Who typically uses it?

A: Power system planners, utility and substation engineers, protection engineers, consultants and equipment suppliers who need consistent, country‑typical or generic input data for short‑circuit studies.

Q: Is it current or superseded?

A: IEC TR 60909-2 was published on 13 November 2008 (Edition 2.0). IEC’s publication record lists a stability (review) date for this TR; the document remains the official IEC Technical Report as published in 2008 and is identified with the stability date shown on IEC’s publication page. Users should verify the IEC publication metadata for any national/corporate adoption or later revisions before applying the data.

Q: Is it part of a series?

A: Yes — it is Part 2 of the IEC 60909 series. Other parts include IEC 60909-0 (calculation of currents / main standard), IEC TR 60909-1 (factors for calculation) and IEC 60909-3 (special cases for line-to-earth and partial earth currents); the parts are intended to be used together where appropriate.

Q: What are the key keywords?

A: Short‑circuit current, equipment data, impedance, transformer reactance, synchronous machine reactance, cable impedance, busbar impedance, IEC 60909.