francois deschamps – france – rt 2c

Frankfurt (Germany), 6-9 June 2011

Francois DESCHAMPS – France – RT 2c

Practical Implementation of the “EMF” EU Directive by an electrical company


Implementation in RTE : risk analysis and risk management policy

General introduction to the Directive 2004/40/CE

Exposure limit values Risk assessment process


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


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


Implementation in RTE : Risk analysis General results Risk management policy regarding live-line working

General introduction to the Directive 2004/40/CE


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


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


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


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


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


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

francois deschamps – france – rt 2c

Documents