BS EN IEC 62271-109:2019

What is BS EN IEC 62271‑109 on Series capacitor by-pass switches about? 

BS EN IEC 62271‑109 is an international standard that focuses on high-voltage switchgear and control gear. 

BS EN IEC 62271‑109 is applicable to AC series capacitor by-pass switches designed for outdoor installation and for operation at frequencies of 50 Hz and 60 Hz on systems having voltages above 52 kV. It is only applicable to by-pass switches for use in three-phase systems. 

BS EN IEC 62271‑109 gives technical specifications like terms, normal and special terms, and conditions, ratings, design and construction, type tests, routine tests, safety precautions, etc for alternating-current series capacitor by-pass switches. 

Note: BS EN IEC 62271‑109 is also applicable to the operating devices of by-pass switches and to their auxiliary equipment. 

Who is BS EN IEC 62271‑109 on Series capacitor by-pass switches for? 

BS EN IEC 62271‑109 on series capacitor by-pass switches is useful for: 

• Manufacturers and suppliers of series capacitor by-pass switches 
• Dealers and distributors of series capacitor by-pass switches 
• Designers and developers of series capacitor by-pass switches 
• Services/test providers for series capacitor by-pass switches 

Why should you use BS EN IEC 62271‑109 on Series capacitor by-pass switches? 

The main advantage of a by-pass switch is, it enables by-passing of series capacitor bank whenever it is pre-charged to its reference precautionary level. It bears up the associated inrush current from the capacitor bank is overlapped on the line fault current.  

BS EN IEC 62271‑109 gives you technical specifications like design, construction, ratings, etc which helps you while designing and manufacturing series capacitor by-pass switches according to the international standards. It provides you with the general safety requirements making it feasible to design a series capacitor that has high enough voltage ratings to withstand such high fault currents. 

The users of BS EN IEC 62271‑109 could also get guidelines about the test methods and provisions that ensure durability, high efficiency, and reliability of series capacitor by-pass switches helping you in standardization of the high voltage switchgear products, that are acceptable worldwide. 

What’s changed since the last update? 

BS EN IEC 62271‑109:2019 supersedes BS EN 62271‑109:2009+A1:2013, which is withdrawn. BS EN IEC 62271‑109:2019 contains the following significant technical changes with respect to the previous edition: 

• The document has been restructured according to edition 2.0 of IEC 62271-1, the rated voltage assignation across the by-pass switch has been aligned to the rule defined in IEC 60143-1 
• Some clarifications have been given following a loss of "suitable precautions"; as per Amendment 2 of IEC 62271-100, the section "Rated time quantities" has been moved to Clause 6 under "Time quantities"; as per Amendment 2 of IEC 62271-100, the section "Test for static mechanical loads" have been moved to Clause 6 under "Static mechanical loads" 
• Additional rules have been introduced for vacuum interrupters during impulse tests, additional clarifications have been given regarding the number of reduced impulses during impulse tests 
• A wider tolerance on the current damping during by-pass making current test-duty has been introduced, clarification has been given regarding rated continuous current of the compensated and uncompensated line