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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





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

325657/TND/TDN/1/B 16 June 2014 C:\Users\ryz58252\Downloads\EMF for 132kV HDWP line design.docx

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.



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


i 325657/TND/TDN/1/B 16 June 2014 C:\Users\ryz58252\Downloads\EMF for 132kV HDWP line design.docx


2 325657/TND/TDN/1/B 16 June 2014 C:\Users\ryz58252\Downloads\EMF for 132kV HDWP line design.docx

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



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


March 2012

Power Lines: Demonstrating compliance with EMF public exposure guidelines: A voluntary Code of Practice


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



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



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.



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.



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.



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



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


10


Figure 4.2: Magnetic field rms values on 100m cross-section at mid span

Source: Mott MacDonald calculations

µT


11


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


12


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


13


Figure B.1: 300sq.mm UPAS AAAC (EHC

Source: Quintas and Quintas conductors, SA Technical Data sheet

Appendix B. Conductor Data Sheets


14


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


15


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



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




angle, deg B rms

Res, , µT E real,

kV/m E Img,

kV/m E phase

angle, deg E axis


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




angle, deg B rms

Res, , µT E real,

kV/m E Img,

kV/m E phase

angle, deg E axis


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




angle, deg B rms

Res, , µT E real,

kV/m E Img,

kV/m E phase

angle, deg E axis


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

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