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National Wiring Rules for HV
Installations
Engineers Ireland 20.03.2014
Cormac Madden and Michael O’Hara TC3
2
Agenda
• Opening - John McAuley
• ETCI
• National Wiring Rules for HV
Installations
• Implications
• Next Steps
3
Electro-Technical Council of Ireland
Limited (ETCI)
• Voluntary body formally constituted in 1972
• 18 organisations representative of electro-technology in the RoI
• NSAI is the Irish Member of:
– the International Electrotechnical Commission (IEC)
– the European Committee for Electro-Technical Standardisation (CENELEC)
• ETCI is the electrical committee within this structure
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ETCI Publications
5
Scope
• Installations exceeding 1 kV a.c/1,5 kV
d.c.
– Design requirements
– Selection
– Erection/Installation to ensure
• safety of persons
• proper operation
6
Scope (contd.)
• Exclusions:
– Factory-built and type tested equipment
– Type-tested equipment
– UG or OH lines between separate installations
• Associated EU/International Committees:
– CENELEC CLC TC 99X
– IEC TC99
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TC3 Members Ciaran Allen Consultant
Ian Cowan NSAI
Philip Hicks Hivar Engineering Ltd.
Martin Keane ABB
Iarla Moran Mayo Co. Co.
Michael O’Hara O’Hara Engineering
Padraig Plunkett Kirby Group
Pat Rathbourne HVSM
Seamus Walsh ESBI
Paul Moran (sec.) EirGrid
Cormac Madden (chair) ESB
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Growth in MV and HV Installations
1999
2001
2003
2005
2007
2009
0
200
400
600
800
1,000
1,200
1,400
1,600
Cu
sto
mers
Year
MV and HV Customer Numbers
110kV TSO
110kV Network
38kV
MV
Format of Wiring Rules • Based on IEC Standard I.S. EN 61936-1
• Additional, national Requirements
10
National
requirements
are highlighted
in shaded
sections
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Scope
Normative References
Fundamental Requirements
Terms and Definitions
Safety Measures
Earthing Systems
Protection, Control and Auxiliary Systems
Insulation
Equipment
Installation
Inspection and Testing
Operation and Maintenance
Overview of Rules
12
Scope
Normative References
Fundamental Requirements
Terms and Definitions
Safety Measures
Earthing Systems
Protection, Control and Auxiliary Systems
Insulation
Equipment
Installation
Inspection and Testing
Operation and Maintenance
Overview of Rules
13
Scope
Normative References
Fundamental Requirements
Terms and Definitions
Safety Measures
Earthing Systems
Protection, Control and Auxiliary Systems
Insulation
Equipment
Installation
Inspection and Testing
Operation and Maintenance
14
Scope
Normative References
Fundamental Requirements
Terms and Definitions
Safety Measures
Earthing Systems
Protection, Control and Auxiliary Systems
Insulation
Equipment
Installation
Inspection and Testing
Operation and Maintenance
Preliminaries
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Scope
Normative References
Fundamental Requirements
Terms and Definitions
Safety Measures
Earthing Systems
Protection, Control and Auxiliary Systems
Insulation
Equipment
Installation
Inspection and Testing
Operation and Maintenance
Design, Equipment
and Installation
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Design to take account of: Normal Short Circuit
Note Distribution Code Requirements
Voltage Class
Current Rating of Installation
Corona
Frequency
Environmental
Maximum operating voltages
Special
Overvoltages
Harmonics
Mechanical
Requirements for selection of equipment for Climatic and environmental
conditions both indoor and outdoor are addressed in section 4.
4: Fundamental Requirements
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5: Insulation
5: Insulation
Selecting Insulation Level
Highest voltage of installation
Impulse withstand voltage
Neutral earthing method
Environment
Basic insulation levels
Clearance distances for 10kV, 20kV and 38kV
Distribution Code Requirements
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Table 1 – Minimum clearances in air – Voltage range I (1 kV < Um ≤ 245 kV)
The Distribution Code
requires 125 kV for all
these in Ireland
180 mm in Ireland
220 mm in Ireland
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5: Insulation
5: Insulation
Moving to an unearthed 10 kV system
Earth fault protection
BIL of equipment
Overvoltages in event of arcing earth fault
Phase voltages
In particular on the 10 kV system
Care in equipment selection
Increase in prospective short circuit levels
Change in the Distribution System: - Implications for existing installations
Insulation and clearances
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• Instrument transformers: – Protection class
– Measurement class
– Ratio
– Safety Factor
– Accuracy Limit Factor (ALF)
– Burden
• Protection – Sensitive Earth Fault (SEF) protection:
• Directional is recommended
– Directional SEF: • monitoring of the secondary voltage of voltage transformers is crucial
• loss of the residual voltage effectively disables the SEF
• Loss of secondary voltage to directional SEF ideally should initiate other earth fault protection using parameter change over or similar.
6: Equipment
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• Switchgear
– Indication of position of primary contacts
• Unambiguous
• Clearly visible
– Earth switch locking facilities at the point of
connection to the Distribution System
– Transformers and reactors
• includes protection of the environment if loss of
insulating fluid
6: Equipment
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• Cables:
– “Code of Practice for avoiding danger from
Underground Services” from HSA
– Installation of single core cables set out
– Installation in unstable ground such as bog
land
• Ground movement may put pressure on cable
terminations, bushings etc.
6: Equipment
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• This section covers measures for protection in respect of : – direct contact
– Indirect contact
– Persons working on electrical installations
– Arc fault
– Lightning strokes
– Fire
• Devices to prevent reclosing of isolating devices
• Devices for determining the de-energized state
• Devices for earthing and short-circuiting
• Protection against leakage of insulating liquid and SF6
8: Safety Measures
Together with the requirements of IE EN50110 is
the basis for safe operation of HV electrical installations
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• This section covers:
– Protection, overcurrent, Earth Fault etc.
– DC and AC Supply Circuits
– Compressed Air Systems
– SF6 Gas Handling Plants
– Hydrogen Handling Plants
– EMC of control systems
– Measures to reduce the effects of high and low
frequency interference
9: Protection
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• DC Supply Unit Batteries must be sized to:
– trip breakers and switches at the start of a discharge
period
– supply any continuous DC load
– close the elements of the installation that will restore
a.c. services
9: Protection
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• This section covers: – Design
– Installation
– Testing
– Maintenance
• of earthing systems.
• Main points: – The requirements are designed to address the possibility of a current flowing
through a human being
– based on a probabilistic curve for touch voltage
– In general, interconnection of HV and LV earths is recommended
– The HV earthing system shall form part of the lightning protection system
• This section should be read in conjunction with the Low Voltage National Rules in particular Section 442.
• This section also sets out touch voltage and stress voltage limits arising from Earth Potential Rise (EPR)
10: Earthing
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Scope
Normative References
Fundamental Requirements
Terms and Definitions
Safety Measures
Earthing Systems
Protection, Control and Auxiliary Systems
Insulation
Equipment
Installations
Inspection and Testing
Operation and Maintenance
Commissioning and
Maintenance
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• This section covers: – Inspection and tests to verify:
• compliance of the installation with the rules
• Compliance of the equipment with the applicable technical specifications
• Main points – Description of verification by:
• Visual inspection
• Functional tests
• Measuring
– Completion certificate with generator supplement
• These tests must be carried out by a competent person as described in IS EN 5110.
• The following must be available to the person carrying out the inspection – Detailed Drawings and specification for the installation
– Fault levels at the point of supply
– Details of the supply system earthing (Earthed or Unearthed)
– The necessary test equipment to carry out the tests set out in this section.
11: Inspection and Testing
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• Note: setting and testing of protection systems:
– the settings issued by SO are the maximum settings
required to discriminate with the public system
– May not:
• adequately protect a consumer’s installation
• satisfy the requirements of these Rules
• Satisfy the requirements of the HSA
– In particular Earth Fault and Short Circuit Settings.
• Also true of synchronising generator protection
settings [check TSO]
11: Inspection and Testing
Completion Certificate Layout 1
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Part A: Installation ( < = 38kV ).
MPRN: Grid
Ref. N W
Substation
Name:
Installation
Name &
Address:
Postcode:
Certificate in respect of: Construction & Test of Installation:
or Test only of existing installation:
Date: / / Type: New Alteration Test only
Site
Details
Customer
Name:
Company
Completion Certificate Layout 2
Connection ratings:
Connection Voltage kV Max. Current kA
Max. Import capacity kVA Max. Export capacity kVA
Site Fault Level MVA Site Generation capacity kVA
Min. I’’k3 1 kA Max. I’’k3
1 kA
Min. I’’k1 2 kA Max. I’’k1
2 kA
Supply System Neutral arrangement
Resistance of Earthing system
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1 3 phase fault currents
2 Line to Earth Fault Currents
Connection
Ratings
Settings Received from
DSO:
Earth Fault:
Sensitive Earth Fault.
Overcurrent.
Protection Type: On Site Settings:
Relay has agreed settings
implemented.
Relay injected &
functionally tested.
Relay ripping circuit
verified.
Confirmed Confirmed Confirmed
Earth Fault.
Sensitive Earth Fault.
Overcurrent.
Refer to Protection Report (Please include report references)
Completion Certificate Layout 3
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Protection Settings & Tests (Directly connected Equipment):
Completion Certificate Layout 4
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Alarms & Signalling:
All protection alarms and signals verified Yes
Connected Equipment Details:
Qu
an
tity
Equipment Type & Label.
(e.g. switchgear, transformer,
generators, cable, surge arrestors)
Ratings (as applicable) Cable
Te
st S
he
ets
a
tta
ch
ed:
kV A MVA Short cct. (kA)
BIL (kV)
Length (m)
Size (mm2)
Completion Certificate Layout 5
Verifications
35
(tick boxes as appropriate) Main Compound Other locations
Yes Yes
Equi-potential Bonding
Earth Electrode
Resistance Measurement
Tolerable EPR limits not
exceeded and verified by
current injection.
Switchgear Compliant
Interlocks Operational
Facility to Lock Earths
DC supplies
Protection Operation
Protection Trips verified
Cables
Access & Egress control
Cleanliness & Tidiness
General
Environmental
(Other as applicable)
(Other as applicable)
(Other as applicable)
(Other as applicable)
Verifications
Completion Certificate Layout 6
Contractor: Name: Reg no: Tel:
Address
All necessary commissioning tests completed and satisfactory.
Yes (tick box)
Signed: Date:
Designer: Name:
Signed: Date:
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Certification
Steps followed
February 2011 Consultation Opens
May 2012 Consultation Closes:
8 submissions
212 questions
November 2013 Conclusion
December 2013 Completion
Jan – Mar 2014 Prepare for publication
May 2014 est Publication of 1st
edition
June/Sept 2014 Communication
October 2014 - Maintenance
Since we last met….
Next steps….
Thank You
ETCI, Unit H12, Centrepoint Business Park, Oak Road, Dublin 12.
Tel: 01-4290088
email: [email protected] www.etci.ie
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ETCI Objectives
• Promote and co-ordinate standardisation in all branches of electro-technology – in harmony with international agreements
– in collaboration with the National Standards Authority of Ireland (NSAI).
• Liaison with similar bodies in other countries and with international bodies.
• Promote safety in electrical equipment and installations
• Awareness of electrical safety among the general public
• Advise and make recommendations on any matter pertaining to electrotechnology – subject to the statutory powers, duties and functions of other
bodies.
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• Each installation shall have: – An operation manual
• Procedures: Normal, emergency and maintenance
• Safety instructions for operation of HV installation
– A set of up-to-date drawings and diagrams on premises
– Manufacturers’ operation and maintenance manuals
– Visible display of emergency routes to nearest hospital and emergency phone numbers
12: Maintenance Manual