METREL MI 3298 Instruction Manual With Exercises

Power Network Application Trainer

MI 3298

Instruction manual

with exercises

Ver. 1.0.1, Code no. 20 752 871

Power Network Application Trainer Introduction MI 3298

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Distributor:

Manufacturer:

Metrel d.d.

Ljubljanska cesta 77

SI-1354 Horjul

E-mail: [email protected]

http://www.metrel.si

Mark on your equipment certifies that it meets European Union requirements for

EMC, LVD, ROHS regulations

2018

No part of this publication may be reproduced or utilized in any form or by any means

without permission in writing from METREL.

Power Network Application Trainer Introduction MI 3298

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TABLE OF CONTENTS:

Introduction .................................................................................................................... 4

Earth / Ground network impedance analysing .......................................................... 36

Power generators, transformers, coils .................................................................... 162

Insulating material analyses ..................................................................................... 191

Power Network Application Trainer Introduction MI 3298

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Introduction

1 Introduction ........................................................................................................ 9

1.1 Metrel Academy ...................................................................................................... 9

1.2 Training Modules ..................................................................................................... 9

1.3 Knowledge base .....................................................................................................11

1.4 Partnership .............................................................................................................11

1.5 References .............................................................................................................11

1.6 Certified training modules .......................................................................................12

1.6.1 Module packages ............................................................................................12

1.6.2 Wall Posters ....................................................................................................12

1.6.3 Scope of Application & Technical Support .......................................................12

1.6.4 Qualification certificate ....................................................................................12

1.7 Description of HV training modules ........................................................................13

1.8 Description of MI 3298 HV Training Module set’s ...................................................15

1.8.1 Markings on the module set’s ..........................................................................15

1.8.2 MI 3298 P1: Transmission Line with Pylon1 ....................................................16

1.8.2.1 MI 3298 P1: Technical specification .............................................................19

1.8.2.2 MI 3298 P1 Training Module ........................................................................23

1.8.2.3 MI 3298 P1 - Warnings and safe rules .........................................................24

1.8.3 MI 3298 T: Power Transformer, Cables and Power Loads ..............................25

1.8.3.1.1 MI 3298 – T: Technical specification ........................................................28

1.8.3.2 MI 3298 T Training Module ..........................................................................29

1.8.3.3 MI 3298 T - Warnings and safe rules: ..........................................................30

1.9 Test methods .........................................................................................................31

1.9.1 Auto sequence® ..............................................................................................32

1.9.1.1 Auto Sequence® groups menu ....................................................................32

1.10 Safety precautions..................................................................................................33

1.10.1 Station ground tests ........................................................................................33

1.10.2 Surge arrester ground test...............................................................................33

1.10.3 Neutral and shield wire ground tests appropriate work procedures ..................34

1.10.4 Equipment neutral ground test precautions .....................................................34

1.11 Warnings ................................................................................................................34

1.11.1 Inspectors guide – safety precautions before test ............................................34

1.11.2 Inspectors guide – safety hazards during test..................................................34

1.11.3 Inspectors guide – after test reminder .............................................................35

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Figure 1-1: Organizations included in certification ................................................................................ 10

Figure 2-1: Training module road map .................................................................................................. 10

Figure 3-1: HV Training Module trainer concept ................................................................................... 14

Figure 4-1: MI 3298 P1 training module ................................................................................................ 16

Figure 5-1: Pylon foot default numbering .............................................................................................. 17

Figure 6-1: Pylon foots grounding simulation ........................................................................................ 17

Figure 7-1: Pylon impedance type simulation ....................................................................................... 18

Figure 8-1: List of measurements available with MI 3290 and MI 3295M ............................................. 18

Figure 9-1: List of measurements available with MI 3295S and MI 3295M .......................................... 19

Figure 10-1: MI 3298 P1 resistance test between selected terminals................................................... 19

Figure 11-1: MI 3298 P1 resistance test between selected terminals................................................... 20

Figure 12-1: MI 3298 P1 resistance test between selected terminals................................................... 20

Figure 13-1: MI 3298 P1 resistance test between selected terminals................................................... 21

Figure 14-1: MI 3298 P1 resistance test between selected terminals................................................... 22

Figure 15-1: MI 3298 P1 standard set ................................................................................................... 23

Figure 16-1: MI 3298 T “puzzle” training module .................................................................................. 25

Figure 17-1: Simulation of different transformer winding conditions ..................................................... 26

Figure 18-1: List of measurements available on MI 3280 ..................................................................... 26

Figure 19-1: List of measurements available on Metrel Insulation testers ............................................ 27

Figure 20-1: “Inductive” measurements mode available on MI 3250 instrument .................................. 27

Figure 21-1: MI 3298 T standard set ..................................................................................................... 29

Figure 22-1: Example of Auto Sequences under IEEE 81 -2012 Auto sequence ................................. 33

Figure 23-1: Set of Metrel measuring instruments, which could be used with MI 3298 P1 .................. 36

Figure 24-2: Presentation of specific earth resistance .......................................................................... 44

Figure 25-2: Specific resistance measurement: probe distance vs depth of measurement ................ 45

Figure 26-2: Wenner method for specific earth resistance measurements .......................................... 46

Figure 27-2: Schlumberger method for specific earth resistance measurements ................................. 46

Figure 28-2: Placement of measuring probes (62% method) ............................................................... 48

Figure 29-2: Definition of parameter “a” ............................................................................................... 49

Figure 30-2: Straight-line measuring probes placement ....................................................................... 49

Figure 31-2: Equilateral placement ....................................................................................................... 51

Figure 32-3: Different measured voltage drops at low and high probe resistance ................................ 52

Figure 33-2: MI 3290 – Earth Analyser and MI 3295S–Step Contact Voltage Measuring System ....... 53

Figure 34-2:MI 3123 - Hand-held installation Smartec Earth / Clamptester ......................................... 53

Figure 35-2: 2 – pole measurement ...................................................................................................... 57

Figure 36-2: 3 – pole measurement ...................................................................................................... 58

Figure 37-2: 4 – pole measurement ...................................................................................................... 58

Figure 38-2: Selective (Iron Clamp) measurement ............................................................................... 59

Figure 39-2: 2 Clamps measurement .................................................................................................... 60

Figure 40-2: HF-Earth Resistance (25 kHz) measurement ................................................................... 60

Figure 41-2: Compensation of inductive component with HF 25 kHz method ...................................... 61

Figure 42-2: Selective (Flex Clamps 1-4) measurement ....................................................................... 61

Figure 43-2: Passive (Flex Clamps) measurement ............................................................................... 62

Figure 44-2: Substitute circuit for Passive (Flex Clamps) measurement .............................................. 63

Figure 45-2: Pylon Ground Wire Test (PGWT) example ....................................................................... 64

Figure 46-2: Impulse Measurement example ........................................................................................ 66

Figure 47-2: Typical Impulse shape short-circuit ................................................................................... 66

Figure 48-2: Influence of inductive impedance part at impulse measurement ...................................... 67

Figure 49-2: Influence of inductive impedance part at 3-pole measurement ........................................ 68

Figure 50-2: Dangerous voltages on a faulty earthing system .............................................................. 69

Figure 51-2: Example of ground potential measurement ...................................................................... 71

Figure 52-2: Potential gradient measurements example (straight line)................................................. 71

Figure 53-2: Test step/contact voltage plates and 25kg probes ........................................................... 73

Figure 54-2: Step voltage measurement with MI3290 instrument ......................................................... 73

Figure 55-2: Step voltage measurement with MI3295S & MI3295M instruments ................................. 74

Figure 56-2: Contact voltage measurement with MI3290 instrument.................................................... 74

Figure 57-2: Contact voltage measurement with MI3295S & MI3295M instruments ............................ 74

Figure 58-2: Set of Metrel instruments used with MI 3298 P1 training module .................................... 75

Figure 59-2: Available measurement on the MI 3290 Earth Analayser................................................. 75

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Figure 60-2: 3-pole earth resistance measurement with MI 3290 ......................................................... 81

Figure 61-2: 4-pole earth resistance measurement with MI 3290 ......................................................... 84

Figure 62-2: Earth measurement with MI 3123 ..................................................................................... 87

Figure 63-2: Earth measurement with MI 3295S................................................................................... 89

Figure 64-2: 4-pole earth measurements setup with MI 3290 ............................................................... 92

Figure 65-2: 4-pole earth measurements setup with MI 3290 ............................................................... 94

Figure 66-2: 4-pole earth measurements setup with MI 3290 ............................................................... 95

Figure 67-2: S-Flex measurement setup with MI 3290 ......................................................................... 98

Figure 68-2: S-Flex measurement setup with MI 3290 ....................................................................... 101

Figure 69-2:S-Flex measurement setup .............................................................................................. 104

Figure 70-2: S-Flex measurement setup ............................................................................................. 106

Figure 71-2: S-Flex measurement setup for measuring two pylon foot’s ............................................ 109

Figure 72-2: S-Flex measurement setup for measuring all pylon foots............................................... 111

Figure 73-2: PGWT measurement setup ............................................................................................ 113

Figure 74-2: PGWT measurement setup with connected ground wire ............................................... 115

Figure 75-2: HF measuring method setup ........................................................................................... 117

Figure 76-2: Example of Auto Sequence window ............................................................................... 120

Figure 77-2: 4-pole and S-Flex measurement setup ........................................................................... 121

Figure 78-2: Auto sequence setup (4-pole and S-Flex) ...................................................................... 122

Figure 79-2: 4-pole, HF and S-Flex measurement setup .................................................................... 125

Figure 80-2: Auto sequence setup (4-pole, HF and S-Flex) ............................................................... 126

Figure 81-2: Impulse measuring method setup ................................................................................... 131

Figure 82-2: Impulse measuring method setup with GW conenction.................................................. 133

Figure 83-2: Step voltage setup with MI 3290 ..................................................................................... 136

Figure 84-2: Step voltage setup with MI 3295S .................................................................................. 139

Figure 85-2: Contact (Touch) voltage setup with MI 3290 .................................................................. 142

Figure 86-2: Contact (Touch) voltage setup with MI 3295S ................................................................ 145

Figure 87-2: GPR measuring method with MI 3290 ............................................................................ 149

Figure 88-2: Test point selection for GPR measurement .................................................................... 150

Figure 89-2: GPR measuring method with MI 3290 & MI 3295M ....................................................... 153

Figure 90-2: Selection of test point for GPR measurements ............................................................... 154

Figure 91-2: Graphical presentation of GPR measurements .............................................................. 157

Figure 92-2: GPR measurement with MI 3290 .................................................................................... 158

Figure 93-2: Graphical presentation of GPR measurements .............................................................. 161

Figure 94-3: Set of Metrel measuring instruments, which could be used with MI 3298 T................... 162

Figure 95-3: Single-phase VT/PT transformer and CT transformer turn ratio

measurement connection ................................................................................................ 167

Figure 96-3: Turn ratio measurement of three-phase transformer ...................................................... 169

Figure 97-3: Winding resistance measurement of single-phase transformer ..................................... 170

Figure 98-3: Winding resistance measurement of three-phase transformer ....................................... 171

Figure 99-3: MI 3298 T training module .............................................................................................. 172

Figure 100-3: Transformer turn ratio measurement setup with MI 3280 ............................................. 177

Figure 101-3: Proper crocodiles mounting to ensure good contact .................................................... 180

Figure 102-3: Winding resistance measurement setup with MI 3280 ................................................. 184

Figure 103-3: Winding resistance measurement setup with MI 3250 ................................................ 187

Figure 104-3: Winding resistance measurement setup with MI 3250 ................................................ 189

Figure 105-3: Metrel measuring instruments for insulation measurement, which could be used

with MI 3298 T .............................................................................................................. 191

Figure 106-3: Insulation resistance and capacitance model, partial and total currents ...................... 194

Figure 107-3: Typical current / time diagram for a real voltage source ............................................... 195

Figure 108-3: Current diagram for an ideal voltage source ................................................................. 195

Figure 109-3: Typical insulation resistance/time diagram for a spot reading test ............................... 197

Figure 110-3: Time diagrams of good and bad insulation tested with the time-rise method .............. 198

Figure 111-3: The current/time diagram of a good and bad insulation tested with dielectric

discharge method ......................................................................................................... 199

Figure 112-3: Typical measuring procedure for step voltage measurement ....................................... 200

Figure 113-3: Typical step voltage measurement results ................................................................... 200

Figure 114-3: Measuring procedure for withstanding voltage measurement. ..................................... 201

Figure 115-3: Maximum safe capacitance of tested insulation versus test voltage ............................ 204

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Figure 116-3: Discharging of insulating material (Ciso = 100 nF, Utest = 5 kV) ................................. 204

Figure 117-3: MI 3298 T training module for insulation testing ........................................................... 205

Figure 118-3: Measurement setup for insulation testing ..................................................................... 208

Figure 119-3: Diagnostic test measurement setup ............................................................................. 212

Figure 120-3: Step voltage test measuring setup................................................................................ 215

Figure 121-3: Transformer insulation resistance measurement setup (primary– secondary side) ..... 217

Figure 122-3: Transformer Insulation resistance test setup (primary side – pe terminal) ................... 221

Figure 123-3: Transformer Insulation resistance test setup (secondary side – pe terminal) .............. 223

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Table 1-1: Resistance measurements on the MI 3298 P1 module between selected terminals…… 19

Table 2-1: Resistance measurements on the MI 3298 P1 module between selected terminals .......... 20

Table 3-1: Resistance measurements on the MI 3298 P1 module between selected terminals .......... 21

Table 4-1: Resistance measurements on the MI 3298 P1 module between selected terminals .......... 21

Table 5-1: Resistance measurements on the MI 3298 P1 module between selected terminals .......... 22

Table 6-1: Turn ratio related to the switch position ............................................................................... 28

Table 7-1: Resistance of primary windings U, V, W related to the switch position ............................... 28

Table 8-1: Technical data of the” HV box” intended for insulation test training .................................... 28

Power Network Application Trainer Introduction MI 3298

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1 Introduction

The purpose of this book is to introduce the reader with main topics on high voltage

(power) testing, both in theory as well as in practice. As the book contains hands-on

exercises, it is especially suited for institutions which also wish to share the

knowledge further:

 Institutes,

 Training centres,

 Associations,

 Electrical Safety Boards,

 Trainers for high voltage (power) environment,

- Transformers & substations,

- Power networks & distributions & transmission,

 Registered training groups.

1.1 Metrel Academy

Seminars and practical trainings are prepared by Metrel as a package through the

Power Training Modules under the Metrel Academy.

All training modules are registered by the Ministry of Infrastructure (Energy

Directorate) in Slovenia. It is also possible to register a training module through a

national or an international institute or other partners (Institutes, Training centres,

Electricity Safety Boards, Trainers for Power environment).

All training modules should be equipped with:

 A Catalogue of Knowledge,

 A Catalogue of Exam,

 A Certificate for supplementary qualification and competences.

Certified Training Modules and Seminars are supported by the Metrel Academy.

Within the Knowledge section we make recommendations and suggestions in

support of national vocational qualification schemes. We can also offer training with

completely new Training Modules for any new application areas.

Registering of the module is possible:

 Through national or international institute

 Through the Ministry of Infrastructure (Energy Directorate) in Slovenia

 Partner.

1.2 Training Modules

The purpose behind Metrel's MI 3298 HV Training Platform certifications:

 Only trained personnel can achieve the competency to work as a professional

in an environment of HV platforms and surroundings.

 National or international training module equipped with catalogue of

knowledge could be recognized as valuable for a particular field.

Power Network Application Trainer Introduction MI 3298

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 Metrel is offering equipment, training sets and modules together with

knowledge and certificates.

Figure 1-1: Organizations included in certification

The whole package includes:

Knowledge  Guideline  Handbook  Registered Training Program 

Certified Training  Test Equipment  Safety Precautions on Screen

“Module Puzzle’s”

Figure 2-1: Training module road map

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1.3 Knowledge base

Metrel is continuously investing in research and development, which leads to new

advanced product solutions and improved technical and application knowledge and

practice. Our design & development engineers and product managers have

thoroughly developed their technical knowledge and application experience about

different markets and application fields, so we can proudly state that we are experts

in our field. Metrel works in co-operation with several important external organizations

and institutions like:

 IEC Technical Committees and their Working Groups

 Different Universities and Institutes

 Electro-technical Associations

 Engineers Associations

 Electrical Safety Boards

 Chambers of Engineers

 Chambers of Commerce and Industry

 Chambers of Craft and Small Business

1.4 Partnership

Metrel is a member of the Slovenian Institute for Standardization and cooperates

closely with important associations and committees related to its industry sectors. We

have experts actively participating in several technical committees on the national as

well as international base (IEC Technical Committees and Working Groups). Metrel is

also involved in the Committee for the Electro-Technical Safety and Low-voltage

electrical installations (NNELI) as a partner company through »eTest scheme« in

Slovenia. We are a partner company of E-Check Association of electrical installers in

Germany and cooperate with similar associations in other countries.

1.5 References

Through our own participation in providing and supporting national vocational

qualification programs in the field of electrical safety during past decades and

through our close collaboration with professionals from various industries, at Metrel

Academy we are aware of the importance to continuously develop knowledge and

new skills through various levels of training and qualification programs. This ensures

self-confidence of the workforce in companies involved with Electrical Safety; it

boosts their competitiveness and enables safe and profitable working processes of

their customers.

Metrel’s participation in preparation of curricula for electrical engineering in Slovenia

includes the following:

 Preparation of the Knowledge and Skills catalogue.

 Giving assistance in defining qualification requirements list for the candidates

in the vocational qualification program.

 Preparation of the Assessment Exams catalogue.

Metrel also assists experts working on the vocational qualification programs through

its distribution – partners’ network worldwide. This has been mostly related to the

application of Metrel test and measurement instruments.

Power Network Application Trainer Introduction MI 3298

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1.6 Certified training modules

Certified Training Modules and Seminars are supported with packages of printed

Handbooks, White paper, Application Notes, Exercises, Quick Guide Charts, and

Posters together with other elements of Application and Technical Support. All Power

voltage training modules can be performed on Metrel's Power application trainer.

1.6.1 Module packages

E-Handbooks, Quick Guide Charts, Application Notes and Exercises about

measuring and testing based on the International / European Standardization for

every participant.

1.6.2 Wall Posters

Wall posters visually represent typical testing and measurement procedures and / or

troubleshooting tasks, or a list of required customized tests in certain areas of

application.

1.6.3 Scope of Application & Technical Support

 Demonstration Equipment.

 Testing instruments.

 Power Point Presentations on product solutions.

 On-line Technical Support: any inquires related to Metrel products can be sent

on the following addresses:

o [email protected]

 Bespoke product training for an individual customer or larger groups of people.

 Complete distributor set-up training (product, repair, and calibration training).

 B2B web support provides specific technical information for Metrel partners.

 Download centre enables you downloading product technical data (Manuals,

Datasheets, PC Software, Presentations etc).

1.6.4 Qualification certificate

European Qualification Certificate adjusted to the EU-countries industry standards

ensures the competency of individual participants who pass the final Exam on

Theoretical and Practical knowledge for the specific locally approved Training

Module:

 Know-How Package – for a Transparent Localization Process.

 Knowledge Catalogue – for the specific Training Module for modification to a

local – National regulation.

 Exam’s Catalogue – with the definition of the minimum level of the Entry

conditions for a participant.

 Approved Certificate – approval of the obtained qualification when signed by

a local authorized organization like:

o Training organization.

o Electrical Safety Board Organization, as for example NNELI eTest /

local – National AIE partner.

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Metrel Academy has put out a comprehensive list of training sessions in order to

help you master the latest measurement and testing technologies.

1.7 Description of HV training modules

MI 3298HV Training Module is a multipurpose trainer facility platform suited for

middle level technical schools, training centres and independent organizations who

wish to evaluate people’s competency and improve practical and theoretical

knowledge of their listeners. The MI 3298 is ideally suited for training and education

of larger groups of people as well as for independent practice.

The MI 3298 HV Training Module ensures absolute safety for the user. The user

should follow instructions for safety work with instrument.

Simulation of possible errors is bringing the know-how about troubleshooting,

maintaining and caring out different measurements on the real field. It is aimed as

well to be used at sale-demonstration for presentation of different measurements

techniques.

Note:

When using training modules in technical schools, we suggest the presence of a

qualified person during the practice.

Applications:

 Education, trainings and seminars with theoretical and practical exercising and

testing for upgrading knowledge of a professional’s competence.

 Education and practical training of electrical contractors about safety procedures,

measuring methods and knowledge.

 Demonstration on how to use different measurement instruments and testers.

MI 3298 HV Training Module supports simulation on:

 Electrical Power Installations and HV and MV AC Power Substations.

 Transmission Lines with Pylons, Lines and Cables.

 Industrial platforms with Power Transformers and Power Loads.

 Other insulated or interconnected systems of Rails, Pipes, Fences.

 Switching installations and parallel Measuring systems.

Power Network Application Trainer Introduction MI 3298

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Figure 3-1: HV Training Module trainer concept

HV Training Modules

Measuring methods which could be simulated (trained):

 Ground Networks Impedance

 Earth Surface Potentials

 Fault Simulated Step & Contact Voltage

 Equipotential bonding & Connectivity

 Pylon Selective legs

 HF earth impedance

 Cables Impedances, Resistances and Insulation

 HV Insulation Analysis

 Lightning Protection & Varistors and Surge protection

 Fault Currents and Fuse Characteristics evaluation

 Transformer’s Impedance

 Winding resistance measurements

 Transformers Turn Ratio Analysing

Different modules could be evaluated separately as an independent system and / or

connected together to express the interconnectivity problems and influences between

them.

This type of approach could give the trained personnel clear information on testing

methods, measured values and results on known systems and overview over

situations where systems are becoming more complex when connected together.

Check the general outlook of received training modules and their accessories. There

should be no broken, damaged or scratched parts and no other visible defects that

could lead to electric shock or other hazard when working with the module. Defective

parts should not be used and should be replaced.

Power Network Application Trainer Introduction MI 3298

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1.8 Description of MI 3298 HV Training Module set’s

1.8.1 Markings on the module set’s

The symbol on the HV training module means »Read the Instruction manual with

special care for safe operation«. The symbol requires an action!

 If the HV training module is used in a manner not specified in this Instruction

manual, the protection provided by HV training module could be impaired!

 Read this Instruction manual carefully, otherwise the use of the HV training

module may be dangerous for the operator, the test equipment itself or for the

tested object!

 Do not use the HV training module if any damage is noticed!

 Consider all generally known precautions in order to avoid risk of electric shock

while dealing with hazardous voltages!

 Service intervention is only allowed to be carried out by competent authorized

personnel!

 Do not use the HV training module in a wet environment, around explosive gas,

vapour or dust.

 For the training purposes and for your safety, use Metrel instruments described in

this manual

The symbol on the HV training module means “Hazardous voltage may be

present at the test terminals!”.

 Do not touch any conductive parts of HV training module under test during the

test, risk of electric shock!

Mark on your equipment certifies that it meets European Union requirements for

EMC, LVD, and ROHS regulations.

This equipment should be recycled as electronic waste.

Power Network Application Trainer Introduction MI 3298

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1.8.2 MI 3298 P1: Transmission Line with Pylon1

MI 3298 P1 main parts:

Figure 4-1: MI 3298 P1 training module

1. Connection point for H(C1) probe – earth resistance (impedance)

measurements - R

CE

2. Pylon - connection point for E(C2), ES(P2) clamp

3. Simulating of ground wire connection

4. Selection switch - selection of different resistance pylon foots earthing

condition

5. Selection switch – selection of different earth character (resistive/inductive

type)

6. Connection for the next (neighbourhood) Training module (puzzle concept)

7. “Soil simulation – semi-conductive material” for GPR, step and contact voltage

measurements

8. Fuse 250V T1A

9. Connection point for S(P1) clamp for ground resistance measurement – R

P

10. Ground terminal for the pylon

11. Connection point for H(C1) probe – GPR, Step & Contact measurement- R

CS

12. Pylon grounding ring simulation

13

Power Network Application Trainer Introduction MI 3298

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Figure 5-1: Pylon foot default numbering

1- Pylon foot number 1

2- Pylon foot number 2

3- Pylon foot number 3

4- Pylon foot number 4

Explanation for selection switch Nm. 4– simulation of pylon fault earthing conditions

Figure 6-1: Pylon foots grounding simulation

Pos 0 – regular pylon foots condition (different earth resistance for each foot)

Pos 1 – broken earth connection for pylon foots 2 and 3

Pos 2– simulation of “earthing ring” connection – for GPR, Step & Contact

measurements

Pos 3 –broken pylon foots connection

Power Network Application Trainer Introduction MI 3298

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Explanation for selection switch Nm. 5 (Figure 7-1) – simulation of pylon character

type

Figure 7-1: Pylon impedance type simulation

List of measurements which could be done on MI 3298 – P1 module with MI 3290

Earth Analyser and MI 3295M Step Contact Meter:

Figure 8-1: List of measurements available with MI 3290 and MI 3295M

 Visual check (Safety precautions Before, During and After tests)

 Ground Networks Impedance,

 Pylon ground impedance,

 Pylon legs impedance with flex clamps,

 HF resistance measurement,

 Passive flex clamps measurement,

 Impulse impedance measurement,

 Pylon Ground Wire Test (PGWT)

 Ground Potential Rise (GPR),

 Earth Surface Potential,

 Fault Simulated Step & Contact Voltage.

List of measurements which could be done on MI 3298 – P1 module with MI 3295S

Step Contact Voltage Measuring System and MI 3295M Step Contact Meter:

Power Network Application Trainer Introduction MI 3298

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Figure 9-1: List of measurements available with MI 3295S and MI 3295M

 Ground Potential Rise (GPR),

 Earth Surface Potential,

 Fault Simulated Step & Contact Voltage.

1.8.2.1 MI 3298 P1: Technical specification

1. Resistance between “Earth” terminal and accessible test terminals –

Figure 10-1: MI 3298 P1 resistance test between selected terminals

Test terminal

Low limit [Ω]

High limit [Ω]

1

14,25

15,75

2

9,5

10,5

3

19

21

4

4,5

5,5

5

450

550

6

84,6

103,4

7

450

550

Table 1-1: Resistance measurements on the MI 3298 P1 module between selected terminals

Power Network Application Trainer Introduction MI 3298

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2. Resistance between “Earth” terminal and “pylon foots”–

Figure 11-1: MI 3298 P1 resistance test between selected terminals

Position of Switch 5

Low limit [Ω]

High limit [Ω]

1

2,16

2,64

2

2,40

3,20

Table 2-1: Resistance measurements on the MI 3298 P1 module between selected terminals

3. Resistance between “Earth” terminal and “pylon foots” terminals –

Figure 12-1: MI 3298 P1 resistance test between selected terminals

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METREL MI 3298 Instruction Manual With Exercises

METREL MI 3298 Instruction Manual With Exercises

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