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Planning Inspectorate Reference No. EN020014
Document reference: SPM NWWFC ExA1 Appendices
Author: SP Manweb
Appendix 4.17 – Electro-Magnetic Field Study
The North Wales Wind Farms Connection Project
Environmental Statement Chapter 14 - Electric and Magnetic FieldsTechnical Appendices
Document reference 6.26
Application reference: EN020014 March 2015
Regulation reference: The Infrastructure Planning (Applications: Prescribed Forms and Procedure) Regulations 2009 Regulation 5(2)(a)
North Wales Wind Farms Connection Project
Environmental Statement
Appendix 14.1 Electro Magnetic Field Study
March 2015
PINS Reference: EN020014
Document Reference: 6.26
The Infrastructure Planning (Applications: Prescribed Forms and Procedure) Regulations 2009 – Regulation
5(2)(a)
.
The Planning Act 2008
The Infrastructure Planning (Applications: Prescribed Forms and Procedure) Regulations 2009
Regulation 5(2)(a)
The North Wales Wind Farms Connection Project
Environmental Statement
Appendix 14.1; Electro Magnetic Field Study
Document Reference No. 6.26
Regulation No. Regulation 5(2)(a)
Author Mott MacDonald
Date March 2015
Version 01
Planning Inspectorate Reference No.
EN020014
Electro Magnetic Field study
for 132kV Heavy Duty Wood Pole route design
October 2014
Iberdrola Engineering & Construction
325657 TND TDN 1 B
C:\Users\ryz58252\Downloads\EMF for 132kV HDWP line design.docx
16 June 2014
Electro Magnetic Field study
for 132kV Heavy Duty Wood Pole route design
Electro Magnetic Field study
for 132kV Heavy Duty Wood Pole route design
October 2014
Iberdrola Engineering & Construction
Mott MacDonald, Victory House, Trafalgar Place, Brighton BN1 4FY, United Kingdom
T +44 (0)1273 365 000 F +44(0) 1273 365 100 W www.mottmac.com
Gateway House, 2nd Floor Old Hall Road Bromborough, Wirral, Merseyside CH62 3NX
Electro Magnetic Field study for 132kV Heavy Duty Wood Pole route design
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Revision Date Originator Checker Approver Description StandardA 16 June 2014 Kirill Ryzhov Paul Fletcher Carlos Terra da
Silva First Issue
B 14 Oct 2014 Thomas Fearn Kirill Ryzhov Waheed Ud-din Amended as per comments received from SP
Issue and revision record
This document is issued for the party which commissioned it and for specific purposes connected with the above-captioned project only. It should not be relied upon by any other party or used for any other purpose.
We accept no responsibility for the consequences of this document being relied upon by any other party, or being used for any other purpose, or containing any error or omission which is due to an error or omission in data supplied to us by other parties.
This document contains confidential information and proprietary intellectual property. It should not be shown to other parties without consent from us and from the party which commissioned it.
Electro Magnetic Field study for 132kV Heavy Duty Wood Pole route design
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Chapter Title Page
1 Introduction 2
2 Reference documents 3
3 Electric and magnetic field calculation 4
3.1 Public Exposure Guidelines and Precautionary Principles ____________________________________ 4 3.2 Methodology and list of assumptions ____________________________________________________ 5 3.3 EN-5 assessment criteria _____________________________________________________________ 7 3.4 Study input parameters ______________________________________________________________ 7
4 Conclusion 9
Appendices 11
Appendix A. 0°-5° angle pole Heavy Duty Wood design ______________________________________________ 12 Appendix B. Conductor Data Sheets _____________________________________________________________ 13 Appendix C. HDWP insulators drawings ___________________________________________________________ 15 Appendix D. Electro-magnetic field calculations _____________________________________________________ 16
Contents
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This document was produced by Mott MacDonald Ltd. for the Iberdrola
Engineering and Construction and Scottish Power Engineering as a part of the
Development Consent Order (DCO) application to provide a grid connection to a
number of newly constructed North Wales Wind Farms (NWWF).
The Project involves the construction of a new 132kV overhead line connection
between the Clocaenog Forest area in Denbighshire to a terminal pole to the
south of Glascoed Road (B5381); together with required accesses, construction
laydown areas and other associated works. The proposed line would be built on
Heavy Duty Wood Poles (HDWP) for the length of the route.
Mott MacDonald has been commissioned by Iberdrola Engineering and
Construction (IEC) to support the DCO application. The design principles have
been defined by Technical Guidance for the Design and Analysis of SP 132kV
Single Cct, 4-Wire Heavy Duty Wood Pole OHL, OHL-03-132, Issue No.2.
The minimum permitted electrical clearance from the lowest conductor (OPGW) to
the ground is 6.7m. Together with general arrangement of conductors and
electrical performance of the line, this defines maximum exposure levels of
electrical and magnetic fields.
The scope of this report is to assess the maximum level public exposure to
Electric and Magnetic fields which could result from operation of the proposed
line.
It should be noted that MML are not in a position to advise on the potential
health impacts of exposure to power frequency electric fields or any limits
that should be applied to this exposure.
This report makes reference to recommendations made by others; however
such reference should not be interpreted as an endorsement of these
recommendations.
1 Introduction
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Table 2.1: Reference documents table
Document No. Description Revision or Issue Date
EPRI Transmission Line Reference Book - 200 kV and Above EPRI
3rd Edition Dec, 2005
ICNIRP International Commission on Non-Ionization Radiation Protection. “Guidelines for limiting exposure to time-varying
electric and magnetic fields up to 300 GHz”.
http://www.icnirp.de/
Rev.1
Apr, 1998
Rev.2 2010
www.EMFS.info A guide to the debate on electric and magnetic fields and health by National Grid pls.
current
NPS EN-5 National Policy Statement for Electricity Networks Infrastructure
by Department of Energy and Climate Change
July 2011
Optimum Phasing of high voltage double-circuit Power Lines - A voluntary Code of Practice
by Department of Energy and Climate Change
March 2012
Power Lines: Demonstrating compliance with EMF public exposure guidelines: A voluntary Code of Practice
by Department of Energy and Climate Change
March 2012
Written ministerial statement on Extremely Low Frequency Electromagnetic Fields by The Minister of State, Department
of Health (Gillian Merron); Hansard Volume 497, Part 125.
16 October 2009
Government response to the Stakeholder Advisory Group on extremely low frequency electric and magnetic fields (ELF
EMFs) (SAGE) recommendations
16 October 2009
2 Reference documents
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3.1 Public Exposure Guidelines and Precautionary Principles
Transmission and distribution lines generate electric and magnetic fields, the magnitude of which is defined
by the design characteristics of the line.
There are three tiers of documents that establish the public exposure limits in the UK:
� A Written Ministerial Statement of 16 October 2009, supporting a response to the recommendations of
the Stakeholder Advisory Group on extremely low frequency electric and magnetic fields (SAGE),
established the policy.
� A Code of Practice (first published in February 2011 and amended in March 2012) gives the practical
details needed to apply the policy.
� The National Policy Statement EN-5 writes both of the above documents into the regime for granting
consent to power lines.
� References to these documents are provided in Table 2.1.
The 2009 Ministerial Statement endorsed the SAGE recommendations and reaffirmed that the UK should
adopt the 1998 ICNIRP EMF public exposure guidelines in terms of the 1999 European Recommendation
(1999/519/EC).
The Government response also provided a definition of exposure for "significant periods of time" that the
limits apply to:
"In the absence of any practical precautionary low-cost measures for reducing the exposure to ELF EMF
associated with high voltage overhead lines, the Government believes that the 1998 ICNIRP Guidelines on
exposure to EMFs in the terms of the 1999 EU Recommendation, as recommended by the Health
Protection Agency and in line with the view of the World Health Organization, remain relevant. ... We are
therefore of the view that protection of the members of the public from the possible risks of long term
exposure should be based on compliance with the ICNIRP guidelines. ... In this regard, the UK
Government considers that exposure for potentially significant periods of time might reasonably be
regarded as referring to residential properties, and to properties where members of the public spend an
appreciable proportion of their time. " (paras 40-42)
The ICNIRP guidelines are expressed in terms of the induced current density in affected tissues of the
body, “basic restrictions”, and in terms of measurable “reference levels” of electric field strength (for electric
fields), and magnetic flux density (for magnetic fields). The relationship between the (measurable) electric
field strength or magnetic flux density and induced current density in body tissues requires complex
dosimetric modelling. The reference levels are such that compliance with them will ensure that the basic
restrictions are not reached or exceeded. However, exceeding the reference levels does not necessarily
mean that the basic restrictions will not be met; this would be a trigger for further investigation into the
specific circumstances.
3 Electric and magnetic field calculation
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For occupational exposures at power frequencies (0.05 kHz), the basic restriction is 10 mA m-2
. For the
general public, they apply an extra factor of 5, giving a basic restriction of 2 mA m-2
. They subsequently
clarified that these basic restrictions apply to the central nervous system, not to the whole body.
The associated reference levels are summarised in the following table:
Table 3.1: ICNIRP 1998 Electric and Magnetic Fields Reference Levels
Reference levels ICNIRP 1998 Electric field
ICNIRP 1998
Magnetic field
Public exposure 5 kV/m 100 µT
Occupational exposure 10 kV/m 500 µT
Source: ICNIRP, EMF guidelines, Health Physics 74, 494-522 (1998)
Note: The fields required to produce the basic restriction are higher than the reference levels and need to be derived from
dosimetric modelling.
3.2 Methodology and list of assumptions
The calculations comply with the "Details of acceptable calculations" of the Code of Practice, Department
of Energy and Climate Change and have been carried out using Power Line Systems software PLS CADD
v.13.01. The calculations are based on the methodology described in chapter 8.3 Calculation of electric
fields of EPRI Red Book (EPRI, 1982). The short basic narrative explaining the methodology behind the
calculations is given below:
Electric field is a vector field of electric-field strength (E-field) defined by its space components along three
orthogonal axes. The field satisfy the superposition principle. If more than one charge is present, the
total electric field at any point is equal to the vector sum of the separate electric fields that each point
charge would create in the absence of the others.
For steady-state sinusoidal fields, each space component is a phase or that may be expressed by a root
mean square (rms) value (V/m) and a phase as in:
;
Where Ux, Uy, Uz are the simple unit vectors and for the ex (t) function of time ccomponent:
ex (t) = Ex,r cos wt+ Ex,i sin wt
where Ex,r and Ex,i are the real and imaginary parts.
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The total magnetic field is the sum of all the contributions from line currents:
The magnetic flux density, (B = µ0 · H), rather than the magnetic field strength, (H) is used to describe the
magnetic-field generated by currents in the conductors of transmission lines. Thus, magnetic field is
defined as a vector field of magnetic flux density (B-field). The vector properties of the B-field are the same
as those described for the E-field. The magnitudes of the space components are expressed by their rms
values. In most practical cases, the magnetic field in proximity to balanced three-phase lines may be
calculated considering the currents in the conductors and in the ground wires and neglecting earth
currents. This forms a list of approximations considered during this study.
Reference should be made to the EPRI Red Book for a complete list of the approximations and
assumptions used, but a short list is given below:
1. The wires are infinitely long and straight
2. The ground is approximated flat and all points reported on have the same elevation as that of
centreline;
3. These approximations are only valid for low frequency (50-60Hz) AC power transmission and
distribution lines;
4. The permittivity of air is independent of weather case and equal to the permittivity of free space;
5. The earth is a perfect conductor: the effects of earth return currents (earth resistivity) are ignored when
calculating the magnetic field;
6. Wire positions are taken at the basic tower geometry and determined at maximum conductor (75°C)
and OPGW (35°C) temperature;
7. Shielding effects from structures at ground potential are ignored.
8. Wire height used is the height of the wire where the target point is projected upon it.
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3.3 EN-5 assessment criteria
The DECC voluntary Code of Practice on compliance with EMF guidelines advises that the Energy
Networks Association will maintain a publicly-available list on its website of types of equipment where the
design is such that it is not capable of exceeding the ICNIRP exposure guidelines. This obligation is
implemented through the industry web site (www.emfs.info) which lists compliant equipment; however this
listing does not include the HDWP pole type. The HDWP design has been developed by LSTC for
application to Scottish Power overhead line projects so as to provide effective grounding for the high
resistivity soil types, it also carries additional optical fibre conductor below the phase wires.
In order to provide evidence of compliance with exposure guidelines, a calculation of the maximum fields
(i.e. directly under the line) must be provided. If this maximum value is less than the ICNIRP guideline
levels (as indicated in Table 3.1), it may be assumed that all fields and exposures from that source will be
compliant.
. For both electric and magnetic fields calculations should be made of the 50Hz field 1 m above ground
level on a plain, level surface, ignoring harmonics.
If ICNIRP guideline levels are exceeded in this initial assessment, then it is also necessary to provide
further calculations to establish that the field at the location of the closest property at which the public
exposure guidelines apply is compliant with ICNIRP.
For overhead lines in addition to the above statement a compliance with the Code of Practice on phasing is
required. However, the 132kV NWWF connection line based on the HDWP design, which is three
untranspose phases single-circuit power distribution line. The voluntary code of practise for optimum
phasing is therefore not required.
3.4 Study input parameters
The line design is based on Heavy Duty Wood Poles of a standard type and shown in Appendix A. The
analysed span was modelled on plain ground based on 13.0m poles with 2.5m burial depth (10.5m height
above ground). The analysed span is 120m long which, considering the geometry and thermal
characteristics of the conductors represents the worst case condition (6.7m ground clearance from OPGW
conductor at mid span, limited by the Electricity Safety, Quality & Continuity Regulations 1992).
The calculation of the fields is based on the wires at their maximum sag (i.e. lowest position) and
considered a maximum voltage of 145kV and rated phase current of 770Amp. These parameters represent
a worst case condition and therefore reflect the maximum fields that will be generated by a HDWP line.
The position of conductors at mid span (60m from each support, where ground clearance is at its
minimum) is shown in Figure 3.1.
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Conductor data sheets can be found in Appendix B.
Insulators drawings can be found in Appendix C.
Using PLS-CADD v.13.01 Mott MacDonald have calculated values of electric and magnetic fields based on
EPRI recommendations.
Figure 3.1: Position of wires (red) and OPGW (green) used for EMF analysis
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The results of the study demonstrate that the maximum fields that are generated immediately underneath
the line conductors are compliant with EMF exposure guidelines for the general public. The study has
considered operating at maximum load and minimum ground clearance.
The maximum electric field of 1.589kV/m is slightly offset from the conductor centre-line, on the side
opposite to OPGW installation. A graphical representation of maximum electric field across a 100m wide
cross section is shown in Figure 4.1: Electric field rms values on 100m cross-section
The maximum magnetic field of 15.36µT occurs at the conductor centre-line. A graphical representation
of maximum magnetic field across a 100m wide cross section is shown in Figure 4.2: Magnetic field rms
values on 100m cross-section at mid span
All results are given at 1.0m above ground level in accordance with the DECC Code of Practice.
All the electro-magnetic field results are represented in Table D.1
Figure 4.1: Electric field rms values on 100m cross-section at mid span
Source: Mott MacDonald calculations
4 Conclusion
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Figure 4.2: Magnetic field rms values on 100m cross-section at mid span
Source: Mott MacDonald calculations
µT
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Appendices
Appendix A. 0°-5° angle pole Heavy Duty Wood design _______________________________________________ 12 Appendix B. Conductor Data Sheets ______________________________________________________________ 13 Appendix C. HDWP insulators drawings ___________________________________________________________ 15 Appendix D. Electro-magnetic field calculations _____________________________________________________ 16
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Figure A.1: 0°-5° angle pole Heavy Duty Wood design
Source: OHL-03-132 Issue No.2 Technical Guidance for the Design and Analysis of SP 132kV Single cct, 4-Wire Heavy Duty Wood
Pole OHL. (c/w underslung OPGW Earthwire).
Appendix A. 0°-5° angle pole Heavy Duty Wood design
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Figure B.1: 300sq.mm UPAS AAAC (EHC
Source: Quintas and Quintas conductors, SA Technical Data sheet
Appendix B. Conductor Data Sheets
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Figure B.2: AACSR-ACS 190-48 2C Keziah (OHL-03-096 Issue 6-HC)
Source: IEC email from Wed 11/12/2013 17:54 / Alberto Verdu Cano
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Figure C.1: 125kN Tension insulator set
Source: LSTC/STD/GNA/564
Figure C.2: Post insulator G/A for intermediate structure
Source: LSTC/STD/GNA/568
Appendix C. HDWP insulators drawings
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Electro Magnetic Field study for 132kV Heavy Duty Wood Pole route design
Table D.1: Electro-magnetic field calculations
Offset, m B Real, µT B Img, µT B phase
angle, deg B rms
Res, , µT E real,
kV/m E Img,
kV/m E phase
angle, deg E axis
angle, deg E axis rms Res,
kV/m
-50 0.279 0.14847 28.1 0.316 0.022 0.00242 6.3 87 0.022
-49 0.29 0.15431 28 0.329 0.023 0.00265 6.6 86.9 0.023
-48 0.302 0.1605 28 0.342 0.024 0.00291 6.8 86.8 0.024
-47 0.315 0.16706 27.9 0.357 0.026 0.00319 7.1 86.8 0.026
-46 0.329 0.17404 27.9 0.372 0.027 0.00349 7.3 86.7 0.027
-45 0.344 0.18146 27.8 0.389 0.029 0.00383 7.6 86.6 0.029
-44 0.359 0.18936 27.8 0.406 0.03 0.0042 7.8 86.5 0.031
-43 0.376 0.19779 27.7 0.425 0.032 0.0046 8.1 86.4 0.033
-42 0.394 0.20678 27.7 0.445 0.034 0.00505 8.3 86.4 0.035
-41 0.413 0.2164 27.6 0.466 0.037 0.00555 8.6 86.3 0.037
-40 0.434 0.2267 27.6 0.489 0.039 0.0061 8.8 86.2 0.04
-39 0.456 0.23774 27.5 0.514 0.042 0.00671 9.1 86.1 0.042
-38 0.48 0.24961 27.5 0.541 0.045 0.00738 9.3 86 0.046
-37 0.506 0.26237 27.4 0.57 0.048 0.00813 9.6 85.9 0.049
-36 0.534 0.27613 27.3 0.601 0.052 0.00896 9.8 85.8 0.053
-35 0.565 0.29099 27.3 0.635 0.056 0.0099 10.1 85.6 0.057
-34 0.598 0.30707 27.2 0.672 0.06 0.01094 10.3 85.5 0.061
-33 0.634 0.3245 27.1 0.712 0.065 0.01211 10.5 85.4 0.066
-32 0.673 0.34344 27 0.756 0.071 0.01343 10.8 85.3 0.072
-31 0.716 0.36406 26.9 0.803 0.077 0.01491 11 85.1 0.078
-30 0.763 0.38657 26.9 0.856 0.084 0.01658 11.2 85 0.085
-29 0.815 0.41119 26.8 0.913 0.091 0.01847 11.4 84.8 0.093
Appendix D. Electro-magnetic field calculations
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Electro Magnetic Field study for 132kV Heavy Duty Wood Pole route design
Offset, m B Real, µT B Img, µT B phase
angle, deg B rms
Res, , µT E real,
kV/m E Img,
kV/m E phase
angle, deg E axis
angle, deg E axis rms Res,
kV/m
-28 0.873 0.43821 26.7 0.977 0.1 0.02062 11.6 84.6 0.102
-27 0.936 0.46793 26.6 1.047 0.11 0.02307 11.8 84.5 0.112
-26 1.007 0.50071 26.4 1.125 0.121 0.02587 12 84.3 0.124
-25 1.086 0.53699 26.3 1.211 0.134 0.02907 12.2 84.1 0.137
-24 1.174 0.57726 26.2 1.308 0.149 0.03275 12.4 83.9 0.152
-23 1.273 0.62212 26 1.417 0.166 0.03699 12.6 83.7 0.17
-22 1.385 0.67226 25.9 1.539 0.185 0.04191 12.8 83.5 0.19
-21 1.511 0.72854 25.7 1.677 0.208 0.04761 12.9 83.2 0.213
-20 1.655 0.79194 25.6 1.835 0.234 0.05426 13.1 83 0.24
-19 1.819 0.86368 25.4 2.014 0.265 0.06204 13.2 82.8 0.272
-18 2.008 0.94521 25.2 2.219 0.301 0.07117 13.3 82.5 0.309
-17 2.226 1.0383 25 2.456 0.343 0.08194 13.4 82.3 0.353
-16 2.478 1.14512 24.8 2.73 0.393 0.09468 13.5 82.1 0.405
-15 2.773 1.26832 24.6 3.049 0.453 0.10982 13.6 81.8 0.466
-14 3.118 1.41114 24.4 3.422 0.523 0.12786 13.7 81.7 0.538
-13 3.524 1.57759 24.1 3.861 0.605 0.14942 13.9 81.5 0.624
-12 4.002 1.7726 23.9 4.377 0.702 0.17523 14 81.5 0.724
-11 4.568 2.0022 23.7 4.988 0.814 0.20618 14.2 81.6 0.84
-10 5.236 2.27371 23.5 5.708 0.942 0.24323 14.5 81.8 0.973
-9 6.019 2.59582 23.3 6.554 1.081 0.28741 14.9 82.4 1.119
-8 6.925 2.97852 23.3 7.539 1.225 0.33955 15.5 83.3 1.271
-7 7.952 3.4325 23.3 8.662 1.359 0.39988 16.4 84.8 1.417
-6 9.074 3.9677 23.6 9.903 1.46 0.46707 17.7 86.9 1.533
-5 10.229 4.59017 24.2 11.212 1.498 0.53658 19.7 89.8 1.589
-4 11.325 5.29666 25.1 12.502 1.44 0.59832 22.6 93.7 1.556
-3 12.24 6.06655 26.4 13.661 1.269 0.63472 26.6 98.8 1.414
-2 12.864 6.85305 28 14.576 0.997 0.62228 32 106.1 1.168
-1 13.128 7.57918 30 15.158 0.673 0.54112 38.8 118 0.851
0 13.019 8.14639 32 15.358 0.409 0.39929 44.3 144.1 0.547
1 12.578 8.45954 33.9 15.158 0.411 0.29945 36.1 202.4 0.478
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Electro Magnetic Field study for 132kV Heavy Duty Wood Pole route design
Offset, m B Real, µT B Img, µT B phase
angle, deg B rms
Res, , µT E real,
kV/m E Img,
kV/m E phase
angle, deg E axis
angle, deg E axis rms Res,
kV/m
2 11.87 8.45954 35.5 14.576 0.597 0.41904 35.1 238.2 0.719
3 10.966 8.14639 36.6 13.661 0.767 0.63717 39.7 253.4 0.992
4 9.943 7.57918 37.3 12.502 0.866 0.81667 43.3 262 1.188
5 8.874 6.85305 37.7 11.212 0.894 0.91579 45.7 87.6 1.279
6 7.827 6.06655 37.8 9.903 0.865 0.93572 47.3 91.6 1.274
7 6.853 5.29666 37.7 8.662 0.8 0.89676 48.3 94.3 1.201
8 5.98 4.59017 37.5 7.539 0.717 0.82304 48.9 96.1 1.092
9 5.217 3.9677 37.3 6.554 0.63 0.73431 49.4 97.3 0.967
10 4.561 3.4325 37 5.708 0.546 0.64368 49.7 98 0.844
11 4.001 2.97852 36.7 4.988 0.47 0.55851 49.9 98.4 0.73
12 3.525 2.59582 36.4 4.377 0.403 0.48217 50.1 98.6 0.628
13 3.12 2.27371 36.1 3.861 0.345 0.41561 50.3 98.6 0.54
14 2.775 2.0022 35.8 3.422 0.296 0.35851 50.5 98.5 0.465
15 2.481 1.7726 35.5 3.049 0.254 0.30996 50.6 98.4 0.401
16 2.228 1.57759 35.3 2.73 0.219 0.26886 50.8 98.2 0.347
17 2.01 1.41114 35.1 2.456 0.189 0.2341 51 98 0.301
18 1.821 1.26832 34.9 2.219 0.164 0.20468 51.3 97.8 0.262
19 1.656 1.14512 34.7 2.014 0.143 0.17973 51.5 97.5 0.23
20 1.512 1.0383 34.5 1.835 0.125 0.1585 51.8 97.3 0.202
21 1.386 0.94521 34.3 1.677 0.109 0.14038 52.1 97.1 0.178
22 1.274 0.86368 34.1 1.539 0.096 0.12484 52.4 96.8 0.158
23 1.175 0.79194 34 1.417 0.085 0.11147 52.7 96.6 0.14
24 1.087 0.72854 33.8 1.308 0.075 0.09992 53 96.4 0.125
25 1.008 0.67226 33.7 1.211 0.067 0.0899 53.4 96.2 0.112
26 0.937 0.62212 33.6 1.125 0.059 0.08117 53.8 96 0.101
27 0.873 0.57726 33.5 1.047 0.053 0.07354 54.2 95.9 0.091
28 0.816 0.53699 33.4 0.977 0.048 0.06683 54.6 95.7 0.082
29 0.764 0.50071 33.3 0.913 0.043 0.06093 55 95.5 0.074
30 0.716 0.46793 33.2 0.856 0.038 0.0557 55.4 95.4 0.068
31 0.673 0.43821 33.1 0.803 0.035 0.05107 55.9 95.2 0.062
19 325657/TND/TDN/1/B 16 June 2014 C:\Users\ryz58252\Downloads\EMF for 132kV HDWP line design.docx
Electro Magnetic Field study for 132kV Heavy Duty Wood Pole route design
Offset, m B Real, µT B Img, µT B phase
angle, deg B rms
Res, , µT E real,
kV/m E Img,
kV/m E phase
angle, deg E axis
angle, deg E axis rms Res,
kV/m
32 0.634 0.41119 33 0.756 0.031 0.04694 56.3 95.1 0.056
33 0.598 0.38657 32.9 0.712 0.028 0.04326 56.8 94.9 0.052
34 0.565 0.36406 32.8 0.672 0.026 0.03996 57.2 94.8 0.048
35 0.534 0.34344 32.7 0.635 0.023 0.03699 57.7 94.7 0.044
36 0.506 0.3245 32.7 0.601 0.021 0.03432 58.2 94.5 0.04
37 0.48 0.30707 32.6 0.57 0.019 0.0319 58.7 94.4 0.037
38 0.456 0.29099 32.5 0.541 0.018 0.02972 59.2 94.3 0.035
39 0.434 0.27613 32.5 0.514 0.016 0.02773 59.7 94.2 0.032
40 0.413 0.26237 32.4 0.489 0.015 0.02593 60.2 94.1 0.03
41 0.394 0.24961 32.4 0.466 0.014 0.02428 60.7 94 0.028
42 0.376 0.23774 32.3 0.445 0.013 0.02277 61.2 93.9 0.026
43 0.359 0.2267 32.3 0.425 0.011 0.02139 61.7 93.8 0.024
44 0.344 0.2164 32.2 0.406 0.011 0.02013 62.3 93.7 0.023
45 0.329 0.20678 32.2 0.389 0.01 0.01896 62.8 93.6 0.021
46 0.315 0.19779 32.1 0.372 0.009 0.01789 63.3 93.6 0.02
47 0.302 0.18936 32.1 0.357 0.008 0.0169 63.9 93.5 0.019
48 0.29 0.18146 32 0.342 0.008 0.01599 64.4 93.4 0.018
49 0.279 0.17404 32 0.329 0.007 0.01514 64.9 93.3 0.017
50 0.268 0.16706 31.9 0.316 0.007 0.01436 65.5 93.3 0.016
Electro Magnetic Field study for 132kV Heavy Duty Wood Pole route design
20 325657/TND/TDN/1/B 16 June 2014 C:\Users\ryz58252\Downloads\EMF for 132kV HDWP line design.docx