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CEI EN 61472

Live working - Minimum approach distances for AC systems in the voltage range 72,5 kV to 800 kV - A method of calculation

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Organization: CEI
Publication Date: 1 March 2014
Status: active
Page Count: 50
ICS Code (Power transmission and distribution lines): 29.240.20
ICS Code (Protection against electric shock. Live working): 13.260
ICS Code (Other electrical equipment for working in special conditions): 29.260.99
scope:

This International Standard describes a method for calculating the minimum approach distances for live working, at maximum voltages between 72,5 kV and 800 kV. This standard addresses system overvoltages and the working air distances or tool insulation between parts and/or workers at different electric potentials.

The required withstand voltage and minimum approach distances calculated by the method described in this standard are evaluated taking into consideration the following:

- workers are trained for, and skilled in, working in the live working zone;

- the anticipated overvoltages do not exceed the value selected for the determination of the required minimum approach distance;

- transient overvoltages are the determining overvoltages;

- tool insulation has no continuous film of moisture or measurable contamination present on the surface;

- no lightning is seen or heard within 10 km of the work site;

- allowance is made for the effect of conducting components of tools;

- the effect of altitude, insulators in the gap, etc, on the electric strength is taken into consideration.

For conditions other than the above, the evaluation of the minimum approach distances may require specific data, derived by other calculation or obtained from additional laboratory investigations on the actual situation.

Document History

September 1, 2018
Live working - Minimum approach distances for AC systems in the voltage range 72,5 kV to 800 kV - A method of calculation
A description is not available for this item.
CEI EN 61472
March 1, 2014
Live working - Minimum approach distances for AC systems in the voltage range 72,5 kV to 800 kV - A method of calculation
This International Standard describes a method for calculating the minimum approach distances for live working, at maximum voltages between 72,5 kV and 800 kV. This standard addresses system...
May 1, 2005
Live working - Minimum approach distances for a.c. systems in the voltage range 72,5 kV to 800 kV - A method of calculation
La presente Norma si applica ai lavori sotto tensione per tensioni massime comprese tra 72,5 kV e 800 kV. Essa descrive un metodo di calcolo per determinare le minime distanze di avvicinamento alle...

References

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