National Wiring Rules for Installations over 1 kV ac - Launch of Consultation 19.01.12
Introduction Mick Hanly Chairman, ETCI
Agenda Background CENELEC and IEC ETCI The Wiring Rules Implications The Consultation
3
CENELEC and IEC Founded 1906 'a representative Commission to consider the question of the standardization of the nomenclature and ratings of electrical apparatus and machinery.'
•Founded 1973 •Associated with EU •18 countries •harmonise standards •Remove trade barriers 4
NSAI and ETCI Irish member of: • IEC • CENELEC • Electrotechnical committee for Ireland • 23 Member Organisations • 18 Technical Committees • 200 volunteers
5
ETCI Publications
8
ETCI • • •
17 Technical Committees 200 Members Voluntary Work Technical Committees 1
Household Appliances
13
Alarm Systems
2
Electrical Installations
14
Electric Cables
3
Power Installations Exceeding 1 kV
15
Electromagnetic Fields
4
Switchgear
16
Electromagnetic Compatibility
5
Elec. Safety and Statistics
17
Automatic and Programmable Systems
6
Potentially Explosive Atmospheres
18
Marine Energy
10
Elec. Equipment in Medical Practice
19
Insulators and Surge Arrestors
11
Audio/Vide,. IT and Comm. Tech.
20
Smart Grids, Renewables, EVs and Energy Efficiency
12
Electronic Communication Systems
9
TC3 Members Ian Cowan
NSAI
Dermot Hicks
Hivar Engineering Ltd.
Martin Keane
ABB
Patrick Lord
Lord Engineers Iarla Moran
Mayo Co. Co.
Michael O’Hara
O’Hara Engineering
Pat Rathbourne
HVSM
Tim Moloney (sec.)
Alta Engineering
Cormac Madden (chair)
ESB
13
Growth in MV and HV Installations
2007
2005
2009
Year
2003
2001
1,600 1,400 1,200 1,000 800 600 400 200 0
1999
Customers
MV and HV Customer Numbers
110kV TSO 110kV Network 38kV MV
14
The Wiring Rules
Format of Wiring Rules • Based on IEC Standard I.S. EN 61936-1 • Additional, national Requirements
National requirements are highlighted in shaded sections
16
Scope
Overview of Rules
Normative References Terms and Definitions Fundamental Requirements Insulation Equipment Installation Safety Measures Protection, Control and Auxiliary Systems Earthing Systems Inspection and Testing Operation and Maintenance 17
Overview of Rules
Scope Normative References Terms and Definitions Fundamental Requirements Insulation Equipment Installation Safety Measures
Protection, Control and Auxiliary Systems Earthing Systems Inspection and Testing Operation and Maintenance 18
Overview of Rules
Scope Normative References Terms and Definitions Fundamental Requirements Insulation Equipment Installation Safety Measures
Protection, Control and Auxiliary Systems Earthing Systems Inspection and Testing Operation and Maintenance 19
Scope Normative References Terms and Definitions Fundamental Requirements Insulation Equipment Installation Safety Measures Protection, Control and Auxiliary Systems Earthing Systems Inspection and Testing Operation and Maintenance 20
Scope
Preliminaries
Normative References Terms and Definitions Fundamental Requirements Insulation Equipment Installation Safety Measures
Protection, Control and Auxiliary Systems Earthing Systems Inspection and Testing Operation and Maintenance 21
Scope of Rules Aspects Design Erection
Connection Voltage
Installations
> 1 kV a.c.
Customer Substation
Factory, Industrial Agricultural
50 Hz nominal
Power Stations (1 site)
Commercial or Public Premises
22
Excluded from Scope Lines between installations Overhead Underground But the rules apply at the connection point
Work Methods Live working
Equipment and Installations Mining
Ships and Offshore
Test Sites
Factory built switchgear type tested to IEC
Electric Railways
Electrostatic and Medical
23
2: Normative References • A list of all the IEC standards referred to in the document • E.g. – IEC 60909 determining short circuit currents – IEC 60617 sets out the symbols to be used on drawings and mimics.
• Incorrect use of symbols may result in a device being used to perform a duty for which it was not intended 25
3: Terms and Definitions Terms and Definitions • List of definitions of terms used • Important to avoid confusion in the construction and operation of High Voltage Installations
26
Scope
Design, Equipment and Installation
Normative References Terms and Definitions Fundamental Requirements Insulation Equipment Installation Safety Measures
Protection, Control and Auxiliary Systems Earthing Systems Inspection and Testing Operation and Maintenance 27
4: Fundamental Requirements Design to take account of: Purpose of Installation User’s Requirements Safety of operators and public Environment Maintenance and Possibility of Extension
28
4: Fundamental Requirements Voltage Class Current Rating of Installation Design to take account of:
Normal
Short Circuit
Frequency Corona Overvoltages Harmonics
Note Distribution Code Requirements
Mechanical Environmental Special Maximum operating voltages Requirements for selection of equipment for Climatic and environmental conditions both indoor and outdoor are addressed in section 4. 29
5:
Insulation 5: Insulation
Selecting Insulation Level Highest voltage of installation Impulse withstand voltage Neutral earthing method Environment
Distribution Code Requirements Basic insulation levels Clearance distances for 10kV, 20kV and 38kV
30
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
31
5:
Insulation 5: Insulation
Change in the Distribution System: Implications for existing installations Moving to an unearthed 10 kV system Earth fault protection BIL of equipment Overvoltages in event of arcing earth fault Phase voltages
Insulation and clearances
Increase in prospective short circuit levels In particular on the 10 kV system Care in equipment selection
32
6:
Equipment
• Selection for: – Safe construction – Safe operation • Environmental conditions • Normal operation • Reasonably expected conditions (overload, fault)
– Protection of personnel during operation and maintenance
• Note installations such as Wind Farms: – Harsh environment – Remote, loss of supplies 33
6:
Equipment
• 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.
34
6:
Equipment
• 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 35
6:
Equipment
• 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.
36
7: Installations General
Outdoor installations – open design Indoor installations – open design Prefabricated type-tested switchgear Requirements for buildings
Prefabricated substations Installations on Mast, pole and tower 37
7:
Installations 5: Insulation
General Earth fault protection on each Installation Locking of isolation equipment Short circuit withstand Circuit documentation : each substation Transport routes Lighting Escape and rescue paths Labelling
38
7: Installations
Outdoor installations – open design Clearances Fences
39
7: Installations
Indoor installations – open design Clearances Barriers Escape routes
40
7: Installations
Prefabricated type-tested switchgear Additional requirements for SF6
41
7: Installations
Requirements for buildings Ventilation
Battery rooms, emergency generators
Structure
Transport routes
Working areas
42
7: Installations
Installations on Mast, pole and tower
clearances
43
6:
Safety Measures
• 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 Together with the requirements of IE EN50110 is the basis for safe operation of HV electrical installations 44
9:
Protection
• 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 45
9:
Protection
• 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
46
10: •
Earthing
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) 47
Permissible touch voltage UTp
Scope
Commissioning and Maintenance
Normative References Terms and Definitions Fundamental Requirements Insulation Equipment Installations Safety Measures
Protection, Control and Auxiliary Systems Earthing Systems Inspection and Testing Operation and Maintenance 49
11: Inspection and Testing •
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.
50
11: Inspection and Testing • 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] 51
12: Maintenance Manual • 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
52
National Rules for Electrical Installations Exceeding 1 kV ac Completion Certificate INSTALLATION MPRN
Site Details
No. .
Grid Ref N
W
Assoc. LV cert. no.
.
CUSTOMER NAME
COMPANY
INSTALLATION ADDRESS
Building Street City/Town County
THIS CERTIFICATE IS IN RESPECT OF CONSTRUCTION & TEST OF INSTALLATION OR TEST ONLY OF THE EXISTING INSTALLATION INSTALLATION
Type
Date
new
CONNECTION RATINGS MAXIMUM IMPORT CAPACITY
a l tera ti on kVA MVA
SITE FAULT LEVEL Connecti on Vol ta ge kV
pa rti a l
Tes t onl y of exi s t. Ins ta l l a ti on
MAXIMUM EXPORT CAPACITY
kVA
TOTAL SITE GENERATION CAPACITY
kVA
Ma x. Current A
I”k 31
Mi n. (kA)
Ma x. (kA)
I”k 12
Supply System Neutral Arrangement:
vi a res i s tor
vi a i nductor
s ol i d
unea rthed
TEST RESULTS Resistance of Earthing System
ohms
Connection Ratings
Resistance of Earth System Compliant? (Y/N)
Settings and Test Results
PROTECTION SETTINGS AND TESTS Protection at Main Incomer (Connection Point)
Earth Fault
rel a y ma nufa cturer
settings
injection test
Sensitive Earth Fault
Overcurrent
type ti me I 0>
A
s
tri ppi ng curve
I 0>>
A
s
tri ppi ng curve
I 0>
A
I 0>>
A
2
L2
s s
L3
s s
type ti me
settings
I 0>
A
s
injection test
I 0>
A
s
rel a y ma nufa cturer
tri ppi ng curve
Sensitive Earth Fault
type ti me
I>
A
s
tri ppi ng curve
I>>
A
s
tri ppi ng curve
I>
A
I>>
A
injection test
1
s s
rel a y ma nufa cturer
settings
Generator
L1
Earth Fault
Synchronising Generator (Y/N) 3 pha s e fa ul t current Li ne to Ea rth Fa ul t Current
L1
s s
L2
s s
L3
Overcurrent
s s
If 'Y', complete Embedded Generator Interface Protection (EGIP) form
55
EQUIPMENT DETAILS Quantity Type
Ratings (a s a ppl i ca bl e) kV
A
kVA
kVAr
VDC
kA
BIL kV
Length m
Test Sheet nos.
Switchgear Ring Main Units Transformers Generators Power Factor Correction Cable Circuit DC Supply Unit Generator Protection VERIFICATIONS
Main Substation Other Substations (tick as appropriate) Yes Yes Equipotential Bonding Switchgear Compliant? Are Interlocks Operational Facility to Lock Earth Switch Operation of DC Units Operation of Protection Overcurrent Protection at main switchboard at all sub switchboards Earth Fault Protection at main switchboard at all sub switchboards Transformers Cables General and Environmental
COMMENT OR DETAILS
CONTRACTOR Reg. no. Name Address
Tel:
Equipment Details
Verifications
Certification Reg. Body
Mob.
CERTIFICATION Pre-connection tests completed and found to be satisfactory Signed
For installation (tick as appropriate) Constructor Tester
Qualification
NOTE: This certificate is issued and signed by the person responsible for the constructing and/or testing of the installation or a person duly authorised to act on his behalf. This certificate should be used only for installations connected at voltages over 1 kV ac. Installations connected at a lower voltage require a different certificate. Electrical Installations should be inspected periodically. The Electro-Technical Council is not responsible for the electrical installation or for the accuracy of the information given on this certificate. © ETCI 2011 This document must not be reproduced in any form or manner without the express permission of the Electro-Technical Council of Ireland
56
National Rules for Electrical Installations Exceeding 1 kV ac Completion Certificate INSTALLATION MPRN
No.
Grid Ref N
.
W
Assoc. LV cert. no.
.
CUSTOMER NAME
COMPANY
INSTALLATION ADDRESS
Building Street City/Town County
THIS CERTIFICATE IS IN RESPECT OF CONSTRUCTION & TEST OF INSTALLATION OR TEST ONLY OF THE EXISTING INSTALLATION INSTALLATION
Date
Type
new
CONNECTION RATINGS MAXIMUM IMPORT CAPACITY SITE FAULT LEVEL Connecti on Vol ta ge kV
a l tera ti on kVA MVA
pa rti a l
Tes t onl y of exi s t. Ins ta l l a ti on
MAXIMUM EXPORT CAPACITY
kVA
TOTAL SITE GENERATION CAPACITY
kVA
Ma x. Current A
I”k 31
Mi n. (kA)
Ma x. (kA)
I”k 12
Supply System Neutral Arrangement:
vi a res i s tor
vi a i nductor
s ol i d
unea rthed
57
Resistance of Earthing System
ohms
Resistance of Earth System Compliant? (Y/N)
PROTECTION SETTINGS AND TESTS Protection at Main Incomer (Connection Point)
Earth Fault
settings
injection test
Sensitive Earth Fault
Overcurrent
type
rel a y ma nufa cturer ti me I 0>
A
s
tri ppi ng curve
I 0>>
A
s
tri ppi ng curve
I 0>
A
I 0>>
A
2
L2
s s
L3
s s
type ti me
settings
I 0>
A
s
injection test
I 0>
A
s
rel a y ma nufa cturer
tri ppi ng curve
type ti me
I>
A
s
tri ppi ng curve
I>>
A
s
tri ppi ng curve
I>
A
I>>
A
injection test
1
s s
rel a y ma nufa cturer
settings
Generator
L1
Synchronising Generator (Y/N)
L1
s s
L2
s s
L3
s s
If 'Y', complete Embedded Generator Interface Protection (EGIP) form
3 pha s e fa ul t current Li ne to Ea rth Fa ul t Current
58
EQUIPMENT DETAILS Quantity Type
Ratings kV
A
(a s a ppl i ca bl e) kVA
kVAr
VDC
kA
BIL kV
Length m
Test Sheet nos.
Switchgear Ring Main Units Transformers Generators Power Factor Correction Cable Circuit DC Supply Unit Generator Protection VERIFICATIONS (tick as appropriate)
Equipotential Bonding Switchgear Compliant? Are Interlocks Operational Facility to Lock Earth Switch Operation of DC Units Operation of Protection Overcurrent Protection Earth Fault Protection Transformers Cables General and Environmental
Main Substation Yes
at main switchboard at main switchboard
Other Substations Yes
at all sub switchboards at all sub switchboards
59
National Rules for Electrical Installations Exceeding 1 kV ac Completion Certificate Part B. Synchronising Generator Installation MPRN
Completion Certificate No. Note: This supplementary sheet forms part of the Completion Certificate above
GENERATOR PROTECTION SETTINGS AND TESTS Directional
Overcurrent setting timing test
PROT. TRANSFORMER RATIOS Current
rel a y ma nufa cturer I>
A
ti me
i njected current, pha s e a ngl e
I>
s
tri ppi ng curve
L1 A Ø
°
tri p ti me di recti ona l tes t
I>
I>
res et pha s e a ngl e
A Ø
° Ø
timing test s et poi nt tes t Under vol ta ge setting
timing test s et poi nt tes t
V>
°
A
Ø
°
Ø
°
s
V
ti me
s
V
tri p ti me
s
s
s
tri p vol ta ge
V
V
V
res et vol ta ge
V
V
V
tri ppi ng curve
V
V
V
tri p ti me
s
s
s
tri p vol ta ge
V
V
V
res et vol ta ge
V
V
V
Hz
tri ppi ng curve
Hz
tri p ti me
s et poi nt tes t
tri p frequency
f>
Hz
res et frequency
Hz
s
timing test
i njected frequency
s et poi nt tes t
tri p frequency
f
Loss of Mains
Over/ Under Frequency
type
i njected frequency
s et poi nt tes t
Over/under Voltage
V
s
i njected vol ta ge
timing test
Site Safety
L3 V
settings
Directional Overcurrent
tri ppi ng curve L2
timing test
Earth Fault (NVD)
s
V
f
Introduction Mick Hanly Chairman, ETCI
Agenda Background CENELEC and IEC ETCI The Wiring Rules Implications The Consultation
3
CENELEC and IEC Founded 1906 'a representative Commission to consider the question of the standardization of the nomenclature and ratings of electrical apparatus and machinery.'
•Founded 1973 •Associated with EU •18 countries •harmonise standards •Remove trade barriers 4
NSAI and ETCI Irish member of: • IEC • CENELEC • Electrotechnical committee for Ireland • 23 Member Organisations • 18 Technical Committees • 200 volunteers
5
ETCI Publications
8
ETCI • • •
17 Technical Committees 200 Members Voluntary Work Technical Committees 1
Household Appliances
13
Alarm Systems
2
Electrical Installations
14
Electric Cables
3
Power Installations Exceeding 1 kV
15
Electromagnetic Fields
4
Switchgear
16
Electromagnetic Compatibility
5
Elec. Safety and Statistics
17
Automatic and Programmable Systems
6
Potentially Explosive Atmospheres
18
Marine Energy
10
Elec. Equipment in Medical Practice
19
Insulators and Surge Arrestors
11
Audio/Vide,. IT and Comm. Tech.
20
Smart Grids, Renewables, EVs and Energy Efficiency
12
Electronic Communication Systems
9
TC3 Members Ian Cowan
NSAI
Dermot Hicks
Hivar Engineering Ltd.
Martin Keane
ABB
Patrick Lord
Lord Engineers Iarla Moran
Mayo Co. Co.
Michael O’Hara
O’Hara Engineering
Pat Rathbourne
HVSM
Tim Moloney (sec.)
Alta Engineering
Cormac Madden (chair)
ESB
13
Growth in MV and HV Installations
2007
2005
2009
Year
2003
2001
1,600 1,400 1,200 1,000 800 600 400 200 0
1999
Customers
MV and HV Customer Numbers
110kV TSO 110kV Network 38kV MV
14
The Wiring Rules
Format of Wiring Rules • Based on IEC Standard I.S. EN 61936-1 • Additional, national Requirements
National requirements are highlighted in shaded sections
16
Scope
Overview of Rules
Normative References Terms and Definitions Fundamental Requirements Insulation Equipment Installation Safety Measures Protection, Control and Auxiliary Systems Earthing Systems Inspection and Testing Operation and Maintenance 17
Overview of Rules
Scope Normative References Terms and Definitions Fundamental Requirements Insulation Equipment Installation Safety Measures
Protection, Control and Auxiliary Systems Earthing Systems Inspection and Testing Operation and Maintenance 18
Overview of Rules
Scope Normative References Terms and Definitions Fundamental Requirements Insulation Equipment Installation Safety Measures
Protection, Control and Auxiliary Systems Earthing Systems Inspection and Testing Operation and Maintenance 19
Scope Normative References Terms and Definitions Fundamental Requirements Insulation Equipment Installation Safety Measures Protection, Control and Auxiliary Systems Earthing Systems Inspection and Testing Operation and Maintenance 20
Scope
Preliminaries
Normative References Terms and Definitions Fundamental Requirements Insulation Equipment Installation Safety Measures
Protection, Control and Auxiliary Systems Earthing Systems Inspection and Testing Operation and Maintenance 21
Scope of Rules Aspects Design Erection
Connection Voltage
Installations
> 1 kV a.c.
Customer Substation
Factory, Industrial Agricultural
50 Hz nominal
Power Stations (1 site)
Commercial or Public Premises
22
Excluded from Scope Lines between installations Overhead Underground But the rules apply at the connection point
Work Methods Live working
Equipment and Installations Mining
Ships and Offshore
Test Sites
Factory built switchgear type tested to IEC
Electric Railways
Electrostatic and Medical
23
2: Normative References • A list of all the IEC standards referred to in the document • E.g. – IEC 60909 determining short circuit currents – IEC 60617 sets out the symbols to be used on drawings and mimics.
• Incorrect use of symbols may result in a device being used to perform a duty for which it was not intended 25
3: Terms and Definitions Terms and Definitions • List of definitions of terms used • Important to avoid confusion in the construction and operation of High Voltage Installations
26
Scope
Design, Equipment and Installation
Normative References Terms and Definitions Fundamental Requirements Insulation Equipment Installation Safety Measures
Protection, Control and Auxiliary Systems Earthing Systems Inspection and Testing Operation and Maintenance 27
4: Fundamental Requirements Design to take account of: Purpose of Installation User’s Requirements Safety of operators and public Environment Maintenance and Possibility of Extension
28
4: Fundamental Requirements Voltage Class Current Rating of Installation Design to take account of:
Normal
Short Circuit
Frequency Corona Overvoltages Harmonics
Note Distribution Code Requirements
Mechanical Environmental Special Maximum operating voltages Requirements for selection of equipment for Climatic and environmental conditions both indoor and outdoor are addressed in section 4. 29
5:
Insulation 5: Insulation
Selecting Insulation Level Highest voltage of installation Impulse withstand voltage Neutral earthing method Environment
Distribution Code Requirements Basic insulation levels Clearance distances for 10kV, 20kV and 38kV
30
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
31
5:
Insulation 5: Insulation
Change in the Distribution System: Implications for existing installations Moving to an unearthed 10 kV system Earth fault protection BIL of equipment Overvoltages in event of arcing earth fault Phase voltages
Insulation and clearances
Increase in prospective short circuit levels In particular on the 10 kV system Care in equipment selection
32
6:
Equipment
• Selection for: – Safe construction – Safe operation • Environmental conditions • Normal operation • Reasonably expected conditions (overload, fault)
– Protection of personnel during operation and maintenance
• Note installations such as Wind Farms: – Harsh environment – Remote, loss of supplies 33
6:
Equipment
• 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.
34
6:
Equipment
• 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 35
6:
Equipment
• 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.
36
7: Installations General
Outdoor installations – open design Indoor installations – open design Prefabricated type-tested switchgear Requirements for buildings
Prefabricated substations Installations on Mast, pole and tower 37
7:
Installations 5: Insulation
General Earth fault protection on each Installation Locking of isolation equipment Short circuit withstand Circuit documentation : each substation Transport routes Lighting Escape and rescue paths Labelling
38
7: Installations
Outdoor installations – open design Clearances Fences
39
7: Installations
Indoor installations – open design Clearances Barriers Escape routes
40
7: Installations
Prefabricated type-tested switchgear Additional requirements for SF6
41
7: Installations
Requirements for buildings Ventilation
Battery rooms, emergency generators
Structure
Transport routes
Working areas
42
7: Installations
Installations on Mast, pole and tower
clearances
43
6:
Safety Measures
• 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 Together with the requirements of IE EN50110 is the basis for safe operation of HV electrical installations 44
9:
Protection
• 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 45
9:
Protection
• 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
46
10: •
Earthing
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) 47
Permissible touch voltage UTp
Scope
Commissioning and Maintenance
Normative References Terms and Definitions Fundamental Requirements Insulation Equipment Installations Safety Measures
Protection, Control and Auxiliary Systems Earthing Systems Inspection and Testing Operation and Maintenance 49
11: Inspection and Testing •
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.
50
11: Inspection and Testing • 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] 51
12: Maintenance Manual • 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
52
National Rules for Electrical Installations Exceeding 1 kV ac Completion Certificate INSTALLATION MPRN
Site Details
No. .
Grid Ref N
W
Assoc. LV cert. no.
.
CUSTOMER NAME
COMPANY
INSTALLATION ADDRESS
Building Street City/Town County
THIS CERTIFICATE IS IN RESPECT OF CONSTRUCTION & TEST OF INSTALLATION OR TEST ONLY OF THE EXISTING INSTALLATION INSTALLATION
Type
Date
new
CONNECTION RATINGS MAXIMUM IMPORT CAPACITY
a l tera ti on kVA MVA
SITE FAULT LEVEL Connecti on Vol ta ge kV
pa rti a l
Tes t onl y of exi s t. Ins ta l l a ti on
MAXIMUM EXPORT CAPACITY
kVA
TOTAL SITE GENERATION CAPACITY
kVA
Ma x. Current A
I”k 31
Mi n. (kA)
Ma x. (kA)
I”k 12
Supply System Neutral Arrangement:
vi a res i s tor
vi a i nductor
s ol i d
unea rthed
TEST RESULTS Resistance of Earthing System
ohms
Connection Ratings
Resistance of Earth System Compliant? (Y/N)
Settings and Test Results
PROTECTION SETTINGS AND TESTS Protection at Main Incomer (Connection Point)
Earth Fault
rel a y ma nufa cturer
settings
injection test
Sensitive Earth Fault
Overcurrent
type ti me I 0>
A
s
tri ppi ng curve
I 0>>
A
s
tri ppi ng curve
I 0>
A
I 0>>
A
2
L2
s s
L3
s s
type ti me
settings
I 0>
A
s
injection test
I 0>
A
s
rel a y ma nufa cturer
tri ppi ng curve
Sensitive Earth Fault
type ti me
I>
A
s
tri ppi ng curve
I>>
A
s
tri ppi ng curve
I>
A
I>>
A
injection test
1
s s
rel a y ma nufa cturer
settings
Generator
L1
Earth Fault
Synchronising Generator (Y/N) 3 pha s e fa ul t current Li ne to Ea rth Fa ul t Current
L1
s s
L2
s s
L3
Overcurrent
s s
If 'Y', complete Embedded Generator Interface Protection (EGIP) form
55
EQUIPMENT DETAILS Quantity Type
Ratings (a s a ppl i ca bl e) kV
A
kVA
kVAr
VDC
kA
BIL kV
Length m
Test Sheet nos.
Switchgear Ring Main Units Transformers Generators Power Factor Correction Cable Circuit DC Supply Unit Generator Protection VERIFICATIONS
Main Substation Other Substations (tick as appropriate) Yes Yes Equipotential Bonding Switchgear Compliant? Are Interlocks Operational Facility to Lock Earth Switch Operation of DC Units Operation of Protection Overcurrent Protection at main switchboard at all sub switchboards Earth Fault Protection at main switchboard at all sub switchboards Transformers Cables General and Environmental
COMMENT OR DETAILS
CONTRACTOR Reg. no. Name Address
Tel:
Equipment Details
Verifications
Certification Reg. Body
Mob.
CERTIFICATION Pre-connection tests completed and found to be satisfactory Signed
For installation (tick as appropriate) Constructor Tester
Qualification
NOTE: This certificate is issued and signed by the person responsible for the constructing and/or testing of the installation or a person duly authorised to act on his behalf. This certificate should be used only for installations connected at voltages over 1 kV ac. Installations connected at a lower voltage require a different certificate. Electrical Installations should be inspected periodically. The Electro-Technical Council is not responsible for the electrical installation or for the accuracy of the information given on this certificate. © ETCI 2011 This document must not be reproduced in any form or manner without the express permission of the Electro-Technical Council of Ireland
56
National Rules for Electrical Installations Exceeding 1 kV ac Completion Certificate INSTALLATION MPRN
No.
Grid Ref N
.
W
Assoc. LV cert. no.
.
CUSTOMER NAME
COMPANY
INSTALLATION ADDRESS
Building Street City/Town County
THIS CERTIFICATE IS IN RESPECT OF CONSTRUCTION & TEST OF INSTALLATION OR TEST ONLY OF THE EXISTING INSTALLATION INSTALLATION
Date
Type
new
CONNECTION RATINGS MAXIMUM IMPORT CAPACITY SITE FAULT LEVEL Connecti on Vol ta ge kV
a l tera ti on kVA MVA
pa rti a l
Tes t onl y of exi s t. Ins ta l l a ti on
MAXIMUM EXPORT CAPACITY
kVA
TOTAL SITE GENERATION CAPACITY
kVA
Ma x. Current A
I”k 31
Mi n. (kA)
Ma x. (kA)
I”k 12
Supply System Neutral Arrangement:
vi a res i s tor
vi a i nductor
s ol i d
unea rthed
57
Resistance of Earthing System
ohms
Resistance of Earth System Compliant? (Y/N)
PROTECTION SETTINGS AND TESTS Protection at Main Incomer (Connection Point)
Earth Fault
settings
injection test
Sensitive Earth Fault
Overcurrent
type
rel a y ma nufa cturer ti me I 0>
A
s
tri ppi ng curve
I 0>>
A
s
tri ppi ng curve
I 0>
A
I 0>>
A
2
L2
s s
L3
s s
type ti me
settings
I 0>
A
s
injection test
I 0>
A
s
rel a y ma nufa cturer
tri ppi ng curve
type ti me
I>
A
s
tri ppi ng curve
I>>
A
s
tri ppi ng curve
I>
A
I>>
A
injection test
1
s s
rel a y ma nufa cturer
settings
Generator
L1
Synchronising Generator (Y/N)
L1
s s
L2
s s
L3
s s
If 'Y', complete Embedded Generator Interface Protection (EGIP) form
3 pha s e fa ul t current Li ne to Ea rth Fa ul t Current
58
EQUIPMENT DETAILS Quantity Type
Ratings kV
A
(a s a ppl i ca bl e) kVA
kVAr
VDC
kA
BIL kV
Length m
Test Sheet nos.
Switchgear Ring Main Units Transformers Generators Power Factor Correction Cable Circuit DC Supply Unit Generator Protection VERIFICATIONS (tick as appropriate)
Equipotential Bonding Switchgear Compliant? Are Interlocks Operational Facility to Lock Earth Switch Operation of DC Units Operation of Protection Overcurrent Protection Earth Fault Protection Transformers Cables General and Environmental
Main Substation Yes
at main switchboard at main switchboard
Other Substations Yes
at all sub switchboards at all sub switchboards
59
National Rules for Electrical Installations Exceeding 1 kV ac Completion Certificate Part B. Synchronising Generator Installation MPRN
Completion Certificate No. Note: This supplementary sheet forms part of the Completion Certificate above
GENERATOR PROTECTION SETTINGS AND TESTS Directional
Overcurrent setting timing test
PROT. TRANSFORMER RATIOS Current
rel a y ma nufa cturer I>
A
ti me
i njected current, pha s e a ngl e
I>
s
tri ppi ng curve
L1 A Ø
°
tri p ti me di recti ona l tes t
I>
I>
res et pha s e a ngl e
A Ø
° Ø
timing test s et poi nt tes t Under vol ta ge setting
timing test s et poi nt tes t
V>
°
A
Ø
°
Ø
°
s
V
ti me
s
V
tri p ti me
s
s
s
tri p vol ta ge
V
V
V
res et vol ta ge
V
V
V
tri ppi ng curve
V
V
V
tri p ti me
s
s
s
tri p vol ta ge
V
V
V
res et vol ta ge
V
V
V
Hz
tri ppi ng curve
Hz
tri p ti me
s et poi nt tes t
tri p frequency
f>
Hz
res et frequency
Hz
s
timing test
i njected frequency
s et poi nt tes t
tri p frequency
f
Loss of Mains
Over/ Under Frequency
type
i njected frequency
s et poi nt tes t
Over/under Voltage
V
s
i njected vol ta ge
timing test
Site Safety
L3 V
settings
Directional Overcurrent
tri ppi ng curve L2
timing test
Earth Fault (NVD)
s
V
f
May 24, 2017 National rules for electrical installations 4th edition et101:2008 guidelines for certification of electrical installations. Etci national rules on electrical installations. Earth electrodes are to be found in a wide range of electrical installations including domestic premises.