Handbook
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HB 219:2006
[Current]Earth potential rise — Protection of telecommunications network users, personnel and plant — Worked examples for the application guide
Provides some worked examples that supplement the understanding of AS/NZS 3835.2, Earth potential rise-Protection of telecommunications network users, personnel and plant, Part 2: Application guide.
Published: 24/11/2006
Pages: 73
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope and general
1.1 Scope
1.2 Application
2 Referenced documents
3 Worked examples of EPR calculations
3.1 Introduction to calculations
3.1.1 Electrode configurations
3.1.2 Fault current values calculated
3.1.3 EPR values calculated
3.1.4 Hazard zone area estimation
3.2 Rural distribution transformer supplied by HV overhead line
3.2.1 11 kV source, no NER
3.2.2 22 kV source, no NER
3.3 11 kV and 22 kV concrete or steel poles
3.3.1 11 kV source, no NER
3.3.2 11 kV source, 4 ohm NER
3.3.3 22 kV source, 8 ohm NER
3.4 33 kV Concrete or steel poles
3.4.1 No NER, 5 km DOG (6/4.72 mm aluminium with 7/1.57 mm steel) aerial 33 kV line
3.4.2 20 ohm NER, 10 km DOG (6/4.72 mm aluminium with 7/1.57 mm steel) aerial 33 kV line
3.5 Isolated urban men system (new subdivision) supplied by HV overhead line
3.5.1 11kV source, no NER
3.5.1.1 Impact of NER
3.6 Extensive urban men system supplied by HV overhead line
3.6.1 11kV source, no NER
3.6.2 11kV source, 20 ohm NER
3.6.3 22kV source, no NER
3.6.4 22 kV source, 8 ohm NER
3.7 Extensive urban men system supplied by HV buried cable
3.7.1 11kV source, no NER
3.8 33/11 kV substation
3.8.1 Introduction
3.8.2 Problem description
3.8.3 Lines and cables
3.8.4 Substations
3.8.4.1 Source (Substation A)
3.8.4.2 Substation B transformers
3.8.5 Single phase to earth fault F1
3.8.5.1 Impedances
3.8.5.2 Case 1: RNER1 = 0Ω
3.8.5.3 Case 2: RNER1 = 5Ω
3.8.6 Single phase to earth fault F2
3.8.6.1 Impedances
3.8.6.2 Influence of NER:(Case 1) RNER2 = 0Ω
3.8.6.3 Influence of NER:(Case 2) RNER2 = 5Ω
3.8.7 Single phase to earth fault F3
3.8.7.1 Impedances
3.8.7.2 Influence of NER:(Case 1) RNER2 = 0Ω
3.8.7.3 Influence of NER:(Case 2) RNER2 = 5Ω
3.8.8 Single phase to earth fault F4
3.8.8.1 Impedances
3.8.8.2 Influence of NER:(Case 1) RNER2 = 0Ω
3.8.8.3 Influence of NER:(Case 2) RNER2 = 5Ω
3.8.9 Summary of results
3.8.10 Comments
4 Derivation of typical men impedance values for urban men networks
4.1 Typical urban extensive interconnected men network
4.1.1 No conductive poles bonded to the LV MEN (New Zealand)
4.1.2 All poles conductive and bonded to the LV MEN (Australia)
4.2 Typical isolated urban 48 customer men network
4.2.1 No conductive poles bonded to the LV MEN (New Zealand)
5 EPR tests
5.1 EPR test at 132 kV conductive pole
5.1.1 Introduction
5.1.2 Test method
5.1.3 Assessing the EPR
5.1.4 Test arrangements
5.1.5 Results
Bibliography
Cited references in this standard
Content history
DR 04470
HB 219:2006 REC:2020