EN 50522 earthing of power instalations exceeding 1 kV AC - calculation of actual touch voltage
EN 50522 earthing of power instalations exceeding 1 kV AC - calculation of actual touch voltage
(OP)
Hello,
The European standard EN 50522 is describing with full details how to evaluate the touch voltage.
Item 5.4.2 is depicting a design process which is summarized in a flow chart in Figure 5 in the standard.
In my case:
The criteria of earth potential rise (Ue) < double the allowed touch voltage is not met.
The design flow chart in leading me to take “recognized specified measures M” which are also detailed in the standard – in Annex E of the standard.
Table E.1 of the standard is attached.
My position in the table is the last bottom row (tf<5s & UE> 4 x Utp) and according to the standard I need to “Proof UT < Utp.
The problem I have is that I cannot find in the standard how to calculate UT, which is the actual prospective touch voltage.
Does anyone know where this calculation is described in EN standards (or IEC)?
The European standard EN 50522 is describing with full details how to evaluate the touch voltage.
Item 5.4.2 is depicting a design process which is summarized in a flow chart in Figure 5 in the standard.
In my case:
The criteria of earth potential rise (Ue) < double the allowed touch voltage is not met.
The design flow chart in leading me to take “recognized specified measures M” which are also detailed in the standard – in Annex E of the standard.
Table E.1 of the standard is attached.
My position in the table is the last bottom row (tf<5s & UE> 4 x Utp) and according to the standard I need to “Proof UT < Utp.
The problem I have is that I cannot find in the standard how to calculate UT, which is the actual prospective touch voltage.
Does anyone know where this calculation is described in EN standards (or IEC)?






RE: EN 50522 earthing of power instalations exceeding 1 kV AC - calculation of actual touch voltage
file:///C:/Users/user/Downloads/pub16573.pdf
fig 1 page 80
RE: EN 50522 earthing of power instalations exceeding 1 kV AC - calculation of actual touch voltage
RE: EN 50522 earthing of power instalations exceeding 1 kV AC - calculation of actual touch voltage
Ilze Priedite-Razgale1, Janis Rozenkrons2, 1-2 Riga Technical University
and if you’ll put it in Google-for instance-you’ll get the pdf.
RE: EN 50522 earthing of power instalations exceeding 1 kV AC - calculation of actual touch voltage
RE: EN 50522 earthing of power instalations exceeding 1 kV AC - calculation of actual touch voltage
file:///C:/Users/user/Downloads/pub16573%20(4).pdf
or
https://www.google.co.il/search?q=Development+of+a...
The title has to be as follows:
Development of an Algorithm and Software “MVES-TV 2012” for Touch Voltage Evaluation in MV Networks
RE: EN 50522 earthing of power instalations exceeding 1 kV AC - calculation of actual touch voltage
however, the figure 1 in page 80 in your mentioned file is providing the ALLOWED TOLERABLE touch voltage.
I was asking about the calculation of the actual developed tough voltage which needs to be lower than the value from figure 1.
moreover, this figure 1 is included in IEC 50522 itself.
so the mystery is still unsolved here.
RE: EN 50522 earthing of power instalations exceeding 1 kV AC - calculation of actual touch voltage
"If Ue>4*Utp ,then UT<=Utp is proved according to EN 50522:2010. [7], [8]"
In the list of references :
[7] Post Glover “Neutral Grounding Resistors. Technical information”
[8] Guide for Safety in AC Substation Grounding, IEEE Standard 80:2000
That means, in my opinion, UT has to be calculated according to IEEE 80/2000.
In my opinion also, nor BS7430 neither DIN-VDE 0141 presents any reference to touch and step voltage.
RE: EN 50522 earthing of power instalations exceeding 1 kV AC - calculation of actual touch voltage
however, the reference from IEC set of standards into IEEE is strange.
i do know the IEEE 80.
however, i am straggling to figure out the IEC methodology to handle the tough voltage, and there are gaps in the system, as far as can understand.
i really hope to find a solution within the IEC system.
maybe my effort is for nothing. I hope not.