ENA ER G74 : ISSUE 1 1992
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
View Superseded by
PROCEDURE TO MEET THE REQUIREMENTS OF IEC 909 FOR THE CALCULATION OF SHORT-CIRCUIT CURRENTS IN THREE-PHASE AC POWER SYSTEMS
12-01-2013
10-12-2021
Specifies an outline procedure for a computer-based method for calculating circuit breaker short-circuit making and breaking currents in three-phase ac power systems having a nominal voltage range 380 V to 400 kV. These currents are used for assessing the adequacy of switchgear to perform the required duty. The recommended procedure is also applicable for the calculation of short-circuit currents for other purposes, such as the determination of protection relay settings or the calculation of mechanical forces arising form short- circuit currents.
| DocumentType |
Standard
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| PublisherName |
Energy Networks Association (UK)
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| Status |
Superseded
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| SupersededBy |
| ENA ER G81-4 : ISSUE 3 2016 | FRAMEWORK FOR NEW INDUSTRIAL AND COMMERCIAL UNDERGROUND CONNECTIONS - PART 4: DESIGN AND PLANNING |
| ENA ER G81-1 : ISSUE 3 2016 | FRAMEWORK FOR NEW LOW VOLTAGE HOUSING DEVELOPMENT INSTALLATIONS - PART 1: DESIGN AND PLANNING |
| ENA ER P25 : ISSUE 2 2018 | THE SHORT-CIRCUIT CHARACTERISTICS OF SINGLE-PHASE AND THREE-PHASE LOW VOLTAGE DISTRIBUTION NETWORKS |
| ENA ER G83/2 : ISSUE 2 2012 | RECOMMENDATIONS FOR THE CONNECTION OF TYPE TESTED SMALL-SCALE EMBEDDED GENERATORS (UP TO 16A PER PHASE) IN PARALLEL WITH LOW-VOLTAGE DISTRIBUTION SYSTEMS |