01TMSS01R2
01TMSS01R2
01TMSS01R2
1.0 SCOPE
11.0 EXCEPTIONS
1.0 SCOPE
2.1 The equipment/material manufacturer shall have at least ten (10) years of
manufacturing experience on similar/identical equipment, with a minimum of five
(5) years successful field experience preferably in the international market and in
similar service conditions. The equipment/material shall be Type and Routine tested
according to applicable Industry Standards.
2.2 In-Kingdom Manufacturers for whom ten (10) years of manufacturing experience
and five (5) years of successful field experience cannot be met, on similar
equipment/material, manufacturer plant may be considered for prequalification
subject to the satisfactory completion of type, special and routine tests as specified in
the applicable TMSS.
2.4 Manufacturers shall update National Grid, Saudi Arabia on any changes made in
design/material of prequalified equipment together with all technical details
pertaining to the change/modification including a comparison chart clearly indicating
the changes made for Company review and approval. Manufacturer shall be allowed
to take part in the technical bids only after receiving Company approval on the
modifications.
3.1 The tendered equipment/material shall fully conform to or exceed the minimum
requirements stipulated herein and the TMSS for the said equipment/material.
3.2 Items not specifically covered herein and in the TMSS for the said
equipment/material, shall conform to the latest editions of referred Industry Codes
and Standards.
Arabia approval before proceeding with manufacture. The equivalent Codes and
Standards shall be equal to or better than those specified in the associated TMSS and
the manufacturer shall have extensive experience in using these equivalent Codes
and Standards.
Copy of the equivalent Codes and Standards and the comparison with the specified
Codes and Standards shall be provided to National Grid, Saudi Arabia for review and
acceptance.
3.5 The Manufacturer shall submit ISO 9001 Quality Management Certificate for National Grid,
Saudi Arabia review and acceptance.
3.6 It shall be noted that National Grid, Saudi Arabias interpretation of this
Specification as well as the associated TMSSs shall be binding on the
bidder/contractor/manufacturer/vendor.
3.7 In case of any apparent conflict in requirements, the order of precedence shall be:
* UL : Underwriters Laboratories.
Unless otherwise specified in the associated data schedule of TMSS, the equipment/material
shall be suitable to operate under the typical system parameters as shown in Table-1 and
shall meet the minimum requirements given in clause 4.2 and 4.3.
Table - 1
4.1 Frequency
The nominal frequency for National Grid, Saudi Arabia system is 60 Hz and the
permissible operating frequency range is between 59.9 Hz and 60.1 Hz.
Unless otherwise specified in the associated data schedule of relevant TMSS, the
system neutral shall be solidly grounded for all transmission service voltages.
4.4 Harmonics
Table - 2
Transmission
Medium Voltage
Voltage
Total Harmonic Voltage Distortion 1.5 % 5%
Individual Harmonic Voltage
1.0 % 3%
Distortion
Notes:
5. When no such limits are specified in selected cases, the limits shall be as per
IEEE Standard 519.
4.5.1 Switchyards/Substations
c. Transmission Lines
Table - 3
Table - 4
The insulation levels for all equipment shall not be less than the values specified.
Insulation levels are divided into the following categories:
Refer to Table-5.
Refer to Table-6.
Refer to Table-7.
Refer to Table-8.
Refer to Table-9.
Insulation Levels
Table - 5
* *
withstand 305/ 275/
45 45 80 80 140/
Voltage 160/ 160/ 230/ 305/ 275/ 230/ 305/ 275/ 275 275 or 275 460/ 505/ 460/
140
(Dry/Wet) 140 140 230 275 275 230 275 275 /275 355/ or 325/ 460 460 460
(kVrms) 325 325
Insulation
External
Level
BSL (kVpeak) B
750
* *
BIL(kV peak) 95 95 170 170 325 325 325 550 550 550 550 550 550 650 550/ 550/ 1050 950 950
650 650
Power Frequency
* *
Withstand 38 38 70 70 140 140 140 255/ 230/
230 255 230 230 255 230 275 460 435 395
Voltage (kVrms) 305 275
Indoors
BSL (kVpeak) B
650
* *
BIL (kV peak) 95 95 170 170 325 325 550 550 550 550 550/ 550/ 950 950
650 650
Insulation
Power frequency
Internal
* *
230/ 230/
Level
withstand voltage 38 38 70 70 140 140 230 230 230 230 435 395
(kV rms) 275 275
* - Can be used in areas where the existing insulation level already proven for minimum 5 years subject to National Grid, Saudi Arabia review
and acceptance.
Table - 6
Power Frequency *
315/315
withstand Voltage 55/ 55/ 105/ 105/ 160/ 176/ 265/ 315/ 265/ 315/ 315/
Insulation
or 530/530 530/530
External
375/375
(kVrms)
*
BIL(kV peak) 110 110 195 195 375 375 630 630 630 630 750 630/750 1200 1050
Indoors
Power Frequency
*
withstand Voltage 45 45 80 80 160 160 265 265 265 265 315 265/315 530 460
(kVrms)
* - Can be used in areas where the existing insulation level already proven for minimum 5 years subject to National Grid, Saudi Arabia review and
acceptance.`
Table 7.
Power Frequency
695/
Withstand Voltage 650/650 620/620 630/630 815/815 800/800
695
**(Dry/Wet) (kVrms)
BIL(kV peak) 1425 1300 1300 1300 1425(+240) 1300 (+240)
Indoors
Power Frequency
Insulation Level
OB - Values applicable for Other Bushing (Other than tranformer and GIS bushing).
O - Other Equipment.
Table 8
System Nominal
380
Voltage (kVrms)
Phase to Earth and
Between Across Iisolating
Across Open
Location Phases Distance
Switching Device
BSL G O G O G O
900 900
Outdoor 1050 1050 1575 1680
(+345) (+450)
900 900
Indoor/Internal 1050 950 1425
(+345) (+345)
Table- 9
Rated Short-duration Rated Switching impulse withstand voltage Rated lightning impulse
Power frequency (kV Peak) withstand voltage
withstand voltage (kV Peak)
(kV rms)
Phase to Across open Phase to earth Between Across GIS Phase to earth Across open
earth and switching and across Phases isolating bushing and between switching device
between deice/or open distance (dry) phases and/or isolating
phases isolating switching distance
distance device
710 925 1175 1760 900 710 1550 1550 (+315)
(+450)
Table - 10
Table - 11
Notes:
m (H-1000)/8150
Ka is calculated from the formula Ka = e
Where H = Altitude above sea level (in meters).
Value of m shall be selected per IEC 62271-1
Unless otherwise specified in the associated TMSS, the equipment/material shall be suitable
to operate under the typical system parameters as stated below under normal and single
contingency emergency situation and shall meet the minimum requirements given in clause
4.5 and 4.6 at service conditions specified:
5.13 All outdoor equipment enclosures/material shall be weatherproof and all metal parts
shall be corrosion and abrasion resistant, and the degree of protection shall be IP54
as per IEC 60529 or NEMA Type 4X as per NEMA 250. The degree of protection
for all indoor equipment shall be IP41 as per IEC 60529 or NEMA Type 3 as per
NEMA 250. The degree of protection for medium voltage metalclad switchgear shall
be IP 40 as per IEC 60529.
Unless otherwise specified, the equipment/material shall be protected from corrosion either
by hot-dip galvanizing or painting or by a combination of galvanizing and painting (a
duplex system). The duplex system shall be required as per Table below and/or as specified
and described in the relevant TMSS and SOW/TS.
6.1 Galvanizing
6.1.1 Hot-dip galvanizing for steel structures shall meet the requirements of
ASTM A123. The minimum average thickness of zinc coating shall be as
per Table-11 below:
Table - 11
6.1.2 ASTM A153 for Hardware Fittings, Caps of Insulators and Fasteners
(bolts, nuts and washers). The minimum average thickness of zinc coating
shall be 0.110 mm (770g/m2) for hardware fittings/caps of insulators
The minimum average thickness of zinc coating for bolts, nuts and washers
shall be:
6.1.3 The galvanizing thickness shall be as per manufacturers standard for all
other equipment such as circuit breakers, disconnect switches, etc.
6.2 Painting
shall be 5B, wherein the edges of the cuts are completely smooth and
none of the square of the lattice is detached, unless within 1.0 mm of
the scribed.
6.3.2 The duplex system shall be deemed to have a life at least 30 years or more.
6.3.3 The paint system shall comprise of one primer coat, intermediate coat(s),
and top (finish) coat(s). The thickness of zinc coating shall be a standard
thickness as per ASTM A123 whereas the thickness of paint shall be as per
manufacturers recommendations and subject to approval by National Grid,
Saudi Arabia.
6.3.4 Complete details of the paint system and procedures for application shall be
submitted for review and approval by National Grid, Saudi Arabia.
Ceramic Insulators of substations located within the coastal area shall be coated with
RTV.
DC Circuits : Inside Panel other wiring shall be Gray with +ve and ve sign
The Trip wiring shall be with Red ferrule and marked with letter T.
Alarm/Control
Circuits : Gray
AC Power Circuits : 3 Phase 4 Wire System: Color of wire shall be gray with Red ferrules
marked with letter L1, L2, L3 & N
3 Phase 3 Wire System: Color of wire shall be gray with Red ferrules
marked with letter L1, L2, L3
2 Phase 3 Wire System: Color of wire shall be gray with Red ferrules
marked with letter L1, L2 & N
1 Phase system: Colour of wire shall be gray with Red
Ferrule marked with Letter L & N
8.1 National Grid, Saudi Arabia reserves the right to inspect the equipment/material at
the factory, as deemed necessary, for compliance with the terms and conditions of
the Purchase Order and/or the Project Scope of Work & Technical Specifications
(SOW/TS) and to witness any or all the tests required by the aforementioned
documents and the associated TMSS.
8.2 National Grid, Saudi Arabia may require certificates and data from the manufacturer/
supplier on all pertinent aspects of the manufacturing process.
8.3 In order to permit National Grid, Saudi Arabia representative to be present for
inspection and tests, the contractor/manufacturer/vendor shall give a minimum of 30
days advance notice of his intention to carry out tests on equipment/material being
made available for inspection. In the case of tests of long duration, the actual date of
commencement shall be mutually agreed between the
contractor/manufacturer/vendor and National Grid, Saudi Arabia representative.
8.5 Issuance of the Release for Shipment Certificate shall not be construed as waiving
any of National Grid, Saudi Arabia rights to carry out receipt inspection at
receivingfacilities or contractors material storage yard and rejection of the
equipment/material if not complying with the Purchase Order and the Specifications.
8.6 Vendor/manufacturer shall submit Quality Control Plan/Inspection and Test Plan
(QCP/I&TP) of the proposed equipment/material per Contract Schedules or three (3)
to four (4) weeks after receipt of the Purchase Order and prior to commencement of
the manufacturing for review and approval.
8.7 The Quality Control Plan shall list and define in sequential order all process control
activities, inspection and tests (design, routine and special) required and proposed to
be performed on the equipment/material starting from component procurement,
assembly and testing stages to product dispatch. The Quality Control Plan shall
indicate and identify the applicable standard, detailed description with diagram of the
procedure, acceptance criteria, extent check and record to be generated, reviewed
and retained.
9.1 All equipment/material shall be delivered within a stipulated period as per the
contract.
9.2 Export packing and shipping shall be adequate for sea transport and handling up to
site in Saudi Arabia.
9.3 Each assembly or component shall be skidded, crated, boxed or otherwise suitably
protected against damage or loss during shipment and to facilitate field hand storage.
All openings shall be effectively sealed with temporary closures to prevent entry of
dust, dirt, moisture and other foreign matter.
9.4 Each crate or container shall be marked with the number of pieces contained therein,
the manufacturers catalog number and description of the content, the manufacturer's
name, Country of origin, National Grid, Saudi Arabia Item Number, Purchase Order
Number, Contract No. or J.O. No. and the gross weight in kg.
10.1 General
10.1.1 English language shall be used at all times with respect to documents,
drawings and labels procured or prepared by the contractor/
manufacturer/vendor pertaining to the work.
10.2 Documentation
11.0 EXCEPTIONS
11.2 The contractor/manufacturer/vendor shall clearly state and give a list of deviations or
exceptions. Every exception/deviation shall indicate:
11.3 National Grid, Saudi Arabia reserves the right to reject any or all of the
exceptions/deviations without assigning the reasons thereof..