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Practical Implementation of the “EMF” EU Directive by an electrical company. Francois DESCHAMPS – France – RT 2c. General introduction to the Directive 2004/40/CE Exposure limit values Risk assessment process. Implementation in RTE : risk analysis and risk management policy. - PowerPoint PPT Presentation
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Frankfurt (Germany), 6-9 June 2011
Francois DESCHAMPS – France – RT 2c
Practical Implementation of the “EMF” EU Directive by an electrical company
Frankfurt (Germany), 6-9 June 2011
Implementation in RTE : risk analysis and risk management policy
General introduction to the Directive 2004/40/CE
Exposure limit values Risk assessment process
Frankfurt (Germany), 6-9 June 2011
Population ELV
Fundamental Limit
AV Measurable limits
(at 50 Hz)
Reference document
Workers 10 mA/m²500 µT
10 kV/m1 mA
EU Directive 2004/40/CE (ICNIRP 1998)
Workers 100 mV/m1000 µT10 kV/m
1 mAICNIRP 2010
Exposure Limit Values Basic Restrictions
Action Values Reference Levels
Provided that ELV are not
exceededAllowed
exceeding Forbidden exceeding
Applicable to central nervous system
Frankfurt (Germany), 6-9 June 2011
Organizational or technical measures
AV
Organizational or technical measures
Employer settles an
action plan
AV exceeded
?
COMPLIANTno
yesReduce
exposure
VLEELV exceeded
?
Risk Analysis : exposure assessment
or
Further assessment
COMPLIANT no
yes NOT COMPLIANT exposure mitigation requested
Frankfurt (Germany), 6-9 June 2011
Implementation in RTE : Risk analysis General results Risk management policy regarding live-line working
General introduction to the Directive 2004/40/CE
Frankfurt (Germany), 6-9 June 2011
6
Sett
lem
en
t of
an
act
ion
pla
n
AV exceeded
?
Risk Analysis : exposure assessment in RTE
50 Hz MF
500 µT
yes
50 Hz EF
10 kV/m
yes
C Current 1 mA
yes
I1
Further assessment
Measures to reduce exposure
Frankfurt (Germany), 6-9 June 2011
Exposure to 50 Hz magnetic field Apart from close vicinity situations Compliant Spot sources (coils) Access restricted by fences
Exposure to 50 Hz electric field Work positions in HV substations and towers
Compliant with standardisation limits (IEC 62226-3.1 and draft CENELEC WG17)
Exposure to contact currents
Compliant provided simple organizational measures Grounding of vehicles in HV substations Workers with security shoes (non conducting)
Compliance assessment results
Frankfurt (Germany), 6-9 June 2011
Exposure to magnetic field during live-line working Simple source
I
)'(.2,0 lawsAmpèred
IB
For I = 1000 A B = 500 µT (AV) at d = 0,4 m B = 200 µT at d = 1,0 m B = 100 µT at d = 2,0 m
No concern as far as electrical security distances are respected Further assessment required for live-live working at contact
Frankfurt (Germany), 6-9 June 2011
Exposure to magnetic field during live-line working Further assessment : human dosimetry,i.e. computation of induced currents in the body using sophisticated models
FACE (Bx)
LATERAL ‘(By)
VERTICAL (Bz)
NORMAN
1000 A
Modelling of “worst case” of exposure situations
Frankfurt (Germany), 6-9 June 2011
Exposure to magnetic field during live-line working Result of the detailed exposure assessment : definition of a magnetic field limit on the basis of the “worst case” exposure situation, i.e. the lowest field magnitude which meets the 10 mA/m² limit in the CNS
How to check compliance to this limit ?
Id
IB .2,0
2 possible actions : Lowering the current I ? Increasing the distance d
Increasing the distance
Monitoring of the current
Frankfurt (Germany), 6-9 June 2011
Exposure to 50 Hz magnetic field Apart from close vicinity situations Compliant Spot sources (coils) Access restricted by fences
Exposure to 50 Hz electric field Work positions in HV substations and towers
Compliant with standardisation limits (IEC 62226-3.1 and draft CENELEC WG17)
Exposure to contact currents
Compliant provided simple organizational measures Grounding of vehicles in HV substations Workers with security shoes (non conducting)
Compliance assessment results : General conclusion
HV live-line working Live-line working is not questioned the EU Directive 2004/40/EC Exceeding the limit values is only possible under unusually severe exposure conditions : head at contact of a live wire + heavy load Such conditions can be managed using simple working rules