IEC 60909-3-2003
三相交流系统中的短路电流.第3部分:两个独立的同时对地短路、部分短路电流流入大地情况下的电流

Short-circuit currents in three-phase a.c. systems - Part 3: Currents during two separate simultaneous line-to-earth short circuits and partial short-circuit currents flowing through earth

IEC 60909-3-2003 发布历史

This part of IEC 60909 specifies procedures for calculation of the prospective short-circuit. currents with an unbalanced short circuit in high-voltage three-phase AC systems operating at nominal frequency 50 Hz or 60 Hz, i.e. a) currents during two separate simultaneous line-to-earth short circuits in isolated neutral or resonant earthed neutral systems; b) partial short-circuit currents flowing through earth in case of single line-to-earth short circuit in solidly earthed or low-impedance earthed neutral systems. The currents calculated by these procedures are used when determining induced voltages or touch or step voltages and rise of earth potential at a station (power station or substation). This standard does not cover: a) short-circuit currents deliberately created under controlled conditions as in short-circuit testing stations, or b) short-circuit currents in the electrical installations on board ships or aeroplanes, or c) single line-to-earth faults in isolated or resonant earthed systems. The object of this standard is to establish practical and concise procedures for the calculation of line-to-earth short-circuit currents during two separate simultaneous line-to-earth short circuits and partial short-circuit currents through earth from electrical installations, leading to conservative results with sufficient accuracy. For this purpose, the current is determined by considering an equivalent voltage source applied at the short-circuit location with all other sources set to zero. The procedure is suitable for determination by manual methods or digital computation. This standard is an addition to IEC 60909-0. General definitions, symbols and calculation assumptions refer to that publication. Special items only are defined or specified in this document. This does not exclude the use of special methods, for example the superposition method, adjusted to particular circumstances, if they give at least the same precision. As stated in IEC 60909-0, short-circuit currents and their parameters may also be determined by system tests. The calculation of the short-circuit parameters based on the rated data of the electrical equipment and the topological arrangement of the system has the advantage of being possible both for existing systems and for systems at the planning stage.

IEC 60909-3-2003由国际电工委员会 IX-IEC 发布于 2003-09。

IEC 60909-3-2003 在中国标准分类中归属于: K04 基础标准和通用方法，在国际标准分类中归属于: 17.220.01 电学、磁学综合。

IEC 60909-3-2003的历代版本如下：

• 1995年09月 IEC 60909-3-1995 三相交流系统短路电流计算 第3部分:两个独立的同时单相对地短路、部分短路电流流入大地情况下的电流
• 2003年09月 IEC 60909-3-2003 三相交流系统中的短路电流.第3部分:两个独立的同时对地短路、部分短路电流流入大地情况下的电流
• 2009年03月 IEC 60909-3-2009 三相交流系统中短路电流.第3部分:两个独立的同时单线路对地短路和部分短路电流流入大地情况下的电流

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标准号

IEC 60909-3-2003

发布日期

2003年09月

实施日期

废止日期

无

中国标准分类号

K04

国际标准分类号

17.220.01

发布单位

IX-IEC

代替标准

IEC 60909-3-2009

适用范围

This part of IEC 60909 specifies procedures for calculation of the prospective short-circuit. currents with an unbalanced short circuit in high-voltage three-phase AC systems operating at nominal frequency 50 Hz or 60 Hz, i.e. a) currents during two separate simultaneous line-to-earth short circuits in isolated neutral or resonant earthed neutral systems; b) partial short-circuit currents flowing through earth in case of single line-to-earth short circuit in solidly earthed or low-impedance earthed neutral systems. The currents calculated by these procedures are used when determining induced voltages or touch or step voltages and rise of earth potential at a station (power station or substation). This standard does not cover: a) short-circuit currents deliberately created under controlled conditions as in short-circuit testing stations, or b) short-circuit currents in the electrical installations on board ships or aeroplanes, or c) single line-to-earth faults in isolated or resonant earthed systems. The object of this standard is to establish practical and concise procedures for the calculation of line-to-earth short-circuit currents during two separate simultaneous line-to-earth short circuits and partial short-circuit currents through earth from electrical installations, leading to conservative results with sufficient accuracy. For this purpose, the current is determined by considering an equivalent voltage source applied at the short-circuit location with all other sources set to zero. The procedure is suitable for determination by manual methods or digital computation. This standard is an addition to IEC 60909-0. General definitions, symbols and calculation assumptions refer to that publication. Special items only are defined or specified in this document. This does not exclude the use of special methods, for example the superposition method, adjusted to particular circumstances, if they give at least the same precision. As stated in IEC 60909-0, short-circuit currents and their parameters may also be determined by system tests. The calculation of the short-circuit parameters based on the rated data of the electrical equipment and the topological arrangement of the system has the advantage of being possible both for existing systems and for systems at the planning stage.

IEC 60909-3-2003系列标准

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