Ministry of Electricity
Planning and Studies Office
Baghdad – Iraq
SPECIFICATION No. D-68
TECHNICAL SPESIFICATION OF
MV SECTIONALIZER 33 kV
REVISION YEAR 2015
1.0 SCOPE
This MOE Distribution Materials Specification specifies the minimum technical
requirements for design, engineering, manufacture, inspection, testing and performance
requirements for pole mounted Automatic Line Sectionalizer intended to be used in
medium voltage overhead distribution system of minister of electricity of Iraq (MOE) in
Iraq . The sectionalizer shall be provided with all necessary equipment for operation,
protection and control.
Service conditions
The air is not normally, heavily polluted by dust, smoke, or corrosive gases, vapor or salt spray.
However at certain times of the year sever dust storms may be experienced.
2.0 GENERAL REQUIREMENT
The equipment shall be of first class quality and designed for continuous satisfactory operation
as continuity of supply is of prime consideration. The design shall allow all necessary
precaution for the safety of operation and maintenance personal. All equipment shall operate
satisfactorily under variation of load, voltage and short circuit or other conditions which may
occur on the system provided that these variations are within assigned ratings of the apparatus.
All the equipment shall be designed to withstand the accidental short circuit .The equipment
used shall be suitable for the following climatic condition prevailing at site.
2.1 Ambient Temperature
Highest maximum – in the shade +55 deg. C.for about 6 Hours a day
Lowest minimum -10 deg . C .
Max . yearly average + 30 deg . C .
Max . daily average + 40 deg . C .
2.2 Temperature under sun
Metal object under direct sunshine attain a temperature + 80 deg . C
2.3 Air Humidity
Maximum 92% at 40 deg. C.
Minimum 12 %
Yearly average 44 %
2.4 Altitude
From sea level Up to 1000 M
2.5 Sand storms
The equipment are subjected to strong and frequent sand storms. Adequate precaution must be
taken to cater for this.
(1)
2.6 Condensation
Enclosed compartments shall have the interior surfaces treated with approved materials.
Such treatment should in no way interfere with the satisfactory operation of the equipment
either electrically or mechanically.
3.0 STANDARDS
The latest relevant issue of the international electro-technical commission (IEC) specifications,
Where these specifications are incomplete or not yet published then the national standards of tenderers
country shall be considered &subject to our approval.
3.1 IEC-60056 High voltage Alternating Current Circuit Breakers.
3.2 IEC-60137 Insulated Bushings for Alternating Voltages above 1000 Volts.
3.3 IEC-60376 Specification and Acceptance of New Sulphur Hexafluoride.
3.4 IEC-60437 Rado Interference Test on High Voltage Insulators.
3.5 ANSI-C37.60 Requirements for overhead, pad mounted, dry vault and submersible
Automatic Circuit Reclosers and Fault Interrupters for AC system.
3.6 ISO-2063 Metallic coatings – Protection of iron andagainst corrosion,
metal spraying of zinc and aluminum.
3.7 BS-729 Guidelines for Zinc Coating.
3.8 ASTM-123 Standard Specification for Zinc (Hot dip galvanized) coatings of iron
and steel.
3.9 ASTM-153 Standard Specification for Zinc Coating (Hot dip) on iron and steel
hardwarebe considered & subject according to our approval.
4.0 DESIGN & CONSTRACTION REQUIRMENT
4.1 System data 33 kV
1- Nominal voltage 33000 volt
2- Highest system voltage 36000 volt
3- Frequency 50 HZ
4- Short circuit level 25 KA r.m.s at 33 kV
5- System 3 – Phase, 3 wires with neutral grounding transformer
to limit E.F current to 1000 amp.
(2)
4.2 Rating & characteristics
Ref Description Unit Specified Value
1- Nominal voltage V 33000
2- Highest system voltage V 36000
3- Continuous current rating A 400
4- Frequency HZ 50
5- Short circuit level r.m.s kA 12.5
6- System 3- phase, 3 wires
7- Basic impulse with stand voltage level ( BIL ) kV 170
8- Number of operation Min. 10000 at rated current
4.3 Sequence of operation
The Sequence of operations must have the following characteristics:
- The sectionalizer counts each over current interruption of the back-up reclosing device and will open after a
pre set number of counts have been registered, within a pre-determined time span. The sectionalizer shall only
lock-out during the open interval of re-closing back – up device.
- Total number of counts to opening, adjustable to 1, 2 or 3. Each instantaneous (fast) and delayed interruption
of back – up device will be counted individually.
4.4 Adjustment and settings
Minimum actuating-current settings: phase fault sensing; adjustable from 16 to 640 Amps.
Earth fault sensing: adjustable from 3.5 to 320 Amps.
Reset / Memory time: adjustable up to 420 second.
4.5 Interrupting medium & Insulation
The sectionalizer shall be SF6 insulated and appropriate gas pressure indication gauge shall be provided to
indicate the gas pressure or any alternative.
4.6 Control unit
The sectionalizer shall have electronic control unit with following capabilities.
i) Processing the command of electrical function.
ii) Fault detection, inrush and count restraint function.
iii) Communication interface facility for local and remote communication (option).
4.7 Position indicator
The sectionalizer shall be provided with position indicator, or other suitable means, which will clearly
indicate the position OFF (in Green) and ON (in Red). This indicator shall be visible from the ground.
4.8 Operating mechanism
Means shall be provided to permit manual operation of the sectionalizer through operating rod or
built in extensible lever system from the ground level.
(3)
4.9 Pole mounting frame
All units shall be supplied with a galvanized steel mounting frame suitable for IEC standard
octagonal steel pole. Appropriate clamping ring shall be provided for the sectionalizer and control
unit to secure the unit with a pole without using bolts through the H poleby using tubular pole.
4.10Lifting lugs
Lifting lugs shall be provided such that sectionalizer can be lifted with a single hook
without damage.
4.11Grounding terminal
All units shall be provided with an appropriate ground terminal.
4.12 Tank
4.12.1The tank shall strong enough to support the vibration of the sectionalizer.
4.12.2 The tank and its accessories shall be adequately protected against corrosion and the
supplier shall include a statement of the method of protection proposed.
4.12.3 The tank shall be galvanized steel and suitable for outdoor using according to our
environment conditions or any suitable alternative.
4.12.4 The tank shall be equipped with two brackets each to accommodate three nos.
lightning arresters both on incoming and outgoing side respectively.
4.13 Bushings
The sectionalizer shall be fitted with suitable bushings conforming to latest
respective international Standards and compatible withM0E service conditions and
system parameters. The bushings shall be provided with anti-bird devices / insolating
caps. The bushings shall be terminated by flat pad terminals to accept vertical
connection with ACSR conductor size 95 mm² to 210 mm².
4.14 Name Plate
Each sectionalizer shall be fitted with an easily readable nameplate of weather Proof
material giving the following details marked in English.
- Manufacturer Name
- Serial Number
- Year of manufacture
- Rated maximum voltage
- CT & VT ratio rating and class
- Rated symmetrical interrupting capacity
- Interruption medium
- Insulation Medium
- Rated continuous current
- Rated frequency
- Rated impulse withstand voltage
- Gross weight
- P.O. number
-MOE logo
(4)
5.0 TESTING AND INSPECTION
5.1 General
5.1.1 All equipment shall be tested in accordance with the latest relevant standards and
as specified in this specification.
5.1.2 The supplier shall provide acceptable type test certificates of the tests dully
witnessed by MOE representative from an international recognized laboratory.
5.2 Inspection
The material shall be subject to inspection and test by our inspectors at any time
during manufacture. All testing and inspection shall be made at the place where the
material manufactured. The manufacturer shall provide all inspection facilities for
the site in inspection and testing. The inspector shall have the right to reject any
portion of the material at time during manufacture if it does not meet with the
requirements of this specification in all particulars. He shall have the right of
overseeing the packing and shipping of all materials to be supplied.
5.3 Type Test
The following tests shall be carried out in accordance with ANSI-C37.63 except for item 5.2.8,
which shall be as per IEC-60437.
-Impulse and power frequency voltage withstands tests.
-Interruption test.
-Operating tests.
-Making current test.
-Minimum tripping current test.
-Temperature rise test.
-Time current test.
-Radio influence voltage test.
5.4 Testing Procedure:
5.4.1 Type test
The method of test, including test circuit arrangements, shall be in accordance with ANSI-C37.63
and IEC-60437.
5.4.2 Routine test
The method of test, including test circuit arrangements, shall be in accordance with ANSI-C37.63
and IEC-60437.
(5)
5.5 Acceptance and rejection:
Any item not meeting the routine test requirements shall be rejected.
6.0 PACKING AND SHIPMENT
The supplier will pack or protect the goods in the most appropriate manner. He will be
responsible for any loss or damage arising from careless packing or protection up to the place of
final destination after completion of the inspection and test at the factory each item shall be
packed for export shipment.
6.1 The sectionalizers shall be delivered ready for service.
6.2 They shall be packed in sea-worthy non-returnable crates.
6.3 Packing notes shall be included in each crate giving a description of goods packed.
6.4 Packing shall be designed to protect against mechanical damage and ingress of moisture and
dust.
6.5 Sectionalizers shall not be packed in any organic material.
6.6 Electrically conducting components shall be marked conducting, clearly and permanently.
6.7 Components or materials, if subject to a shelf life limitation, shall have the final data of use
prominently and permanently shown on all cases.
6.8 Catalogue for the sectionalizer including internal wiring diagram indicating CT connections
monitoring equipment wiring.
6.9 Each crate shall be printed with the following information:
a) Sectionalizers catalogue number.
b) Purchaser’s order number
c) Manufacturer’s name.
d) Year of manufacture.
e) Gross weight in kilogram.
f) Position of slinging points and other relevant handling instructions.
7.0 SPARE PARTS
7.1 A comprehensive list of manufacturer’s recommended spare parts shall be included in the
tender. The quantities offered should be adequate for the initial five (5) years of operation.
7.2 A firm price and delivery period shall be quoted for each item.
7.3 Spares supplied shall be packed to provide long storage without deterioration. Each
package shall be clearly marked and labeled in English with the description of its contents.
7.4 If any spare part requires special storage conditions, these conditions shall be detailed.
(6)
8.0 GUARANTEE
The supplier shall guarantee the sectionalizers against all defects arising out of faulty design, faulty
workmanship or of defective material for period of two (2) years from the date of delivery.
9.0 TRAINING
The supplier shall provide at site training, regarding programming and commissioning for an
adequate period, to be agreed upon by the MOE and the supplier after supply of the sectionalizer.
10.0 SUBMITTALS
10.1 Submittals required with tender:
The Bidder shall submit the following along with the tender.
a) The Bidder shall complete and return one copy of Technical Data Schedule.
b) Type test reports.
c) Clause by clause compliance of the specification and clear indication of any deviations.
d) The Bidder shall also provide original catalogs giving details of the equipment being
offered along with accessories available and the maintenance requirements.
10.2 Submittals required following award of contract:
The following submittals shall be provided by the supplier following the award of
contract.
a) Details of manufacturing and test schedule.
b) Factory test reports.
c) Detailed installation and commissioning instructions.
d) Literature, drawings and photographs adequate to explain in detail the
functioning of the sectionalizers.
e) Detailed maintenance manuals and maintenance instructions.
10.3 Details of drawings required:
The following drawings shall be provided with the tender.
a) Detailed dimensional drawings.
b) Time-current characteristics of auto re-closers for ratings being offered.
c) Mounting details for pole mounted units (Sectionalizer and Control).
(7)
TECHNICAL DATA SCHEDULE
MV SECTIONALIZER UPTO 36 kV
S.No. Description MOE Specified values Vender Proposed
values
1. Nominal System Voltage (kV) 33
2. Maximum operating voltage (kV) (Nominal) 36
3. B.I.L (kV) 170 - 200
4. Continuous current Rating (Amp.) 400
5. Maximum actuating current (Amp.) 16 – 640 (Adjustable)
6. Minimum Earth Fault-Sensing current (Amp.) 3.5 – 320 (Adjustable), block
7. Number of counts to open 1, 2, 3
8. Inrush restraint Phase (cycle) 5 - 20
Ground (sec) 0.3 - 5
9. Phase actuating level multiplier (inrush X1 – X8, BLOCK
restraint)
10. Interrupting Rating Max. Value (Amps)
11. Rated making current RMS, 31500
Asymmetrical. (Amps)
12. Short time Current for 1 second. 12500
(Amps)
13. Creepage length of Bushings
14. Voltage Transformer
15. Radio Influence Voltage (μV)
16. Pole Mounting Frame Required for steel octagonal
poles
17. Current Transformer
(8)
