TECHNICAL SPECIFICATION PEP 24 - 058 REPLACEMENT OF 66KV ISOLATORS DATE 3/11/2023 Technical Specification for 66kV Isolator 1. Introduction Copperbelt Energy Corporation requires 66kV isolators (to be adapted on the existing structure) for use on its electrical network. Therefore, CEC is inviting bids for the supply of the 66kV isolator (disconnector) from reputable companies, in accordance with the technical specifications and datasheets below. 2. Instructions to Bidders a. Bidders MUST fill in the column marked “Guaranteed Particulars” in this document. b. Bidders MUST furnish performance record in service of the types of Isolators (Disconnectors) being offered (reference list) c. All relevant documentation including technical data sheets and quality accreditation must be provided with the submitted bids. 3. General Requirements a) Isolators (and earth switches where applicable) shall be capable of withstanding the dynamic and thermal effects of the maximum possible short circuit current on the system in their closed position. Isolators shall be constructed such that they cannot be dislodged from their open or closed positions by gravity, wind pressure, vibrations, shocks or accidental touching or breaking of the connecting rod of the operating mechanism and do not open under the influence of short circuit. b) Isolator shall have pad locking arrangement in both “Open” and “Closed” positions. c) Control cabinets shall be sheet steel enclosed and shall be dust, weather and vermin proof. A suitable illumination lamp and a 15A 3 pin socket outlet ends all with ON and OFF switches shall be provided. Control cabinets shall be mounted on the extreme of the isolator. d) Isolator interlocking shall be provided between main isolator and earth switch. All interlocks shall be designed to prevent mal-operation. e) Each isolator shall be provided with a mechanically driven auxiliary switch with all necessary contacts for control, indication, interlocking. All contacts from the auxiliary switches shall be brought out to a terminal block housed in the mechanism box. f) During the course of normal operation, it is likely that the isolator may be left in the Open/Closed positions for long periods of time. They shall be designed to operate satisfactorily even after being kept in one position for a long period. g) Nameplate information shall be visible in the position of normal service and installation TECHNICAL SPECIFICATION PEP 24 - 058 REPLACEMENT OF 66KV ISOLATORS DATE 3/11/2023 4. Site Operating Conditions Altitude above mean sea level Maximum ambient temperature for design purposes Average ambient temperature for design purposes Minimum ambient temperature for design purposes Relative humidity maximum at 35oC Maximum wind speed Earthquake loading for design purpose Mean annual rain fall Maximum solar radiation W/m2 Isokeraunic Level average days/year 1400m 40oC 30oC -1oC 95% 40m/s N/A 1065mm 1200 130 TECHNICAL SPECIFICATION PEP 24 - 058 REPLACEMENT OF 66KV ISOLATORS DATE 3/11/2023 5. 66kV Disconnector technical data sheet 66 kV Disconnector - TECHNICAL SPECIFICATION SHEET Description Unit Particular Requirement No 1 Make Any Standards IEC 62271-102 2 Type Horizontal, Three phase double break 3 Service a) Outdoor Application 4 Rated System Voltage Offload kV rms 66 5 Highest System Voltage Kv 72.5 6 Rated frequency Hz 50 A 1200 A 1200 8 Rated short time withstand current, I (3 sec) symmetrical kA rms 31.5 9 Rated peak withstand current kA peak * - Solidly earthed V rms Solid core 100 A kV 1200 7 Rated Normal Current a) ALL disconnectors with earth switches and ALL disconnectors without earth switches. b) (2) Disconnectors without earth switches 10 System Earthing 11 Type of support insulators Rated bus transfer Voltage 12 Insulation level – support insulators Rated Bus transfer current a) Rated 1 min power – frequency withstand voltage b) i. Dry kV rms 140 ii. Wet kV rms 140 kV peak 325 Lightning impulse withstand voltage Guaranteed Particulars TECHNICAL SPECIFICATION PEP 24 - 058 REPLACEMENT OF 66KV ISOLATORS DATE 3/11/2023 66 kV Disconnector - TECHNICAL SPECIFICATION SHEET Description Unit Particular Requirement No c) Switching impulse withstand voltage kV peak As per IEC standard 13 Rated 1 min power – frequency withstand voltage complete disconnector a) To earth kV rms 140 b) Across open switching device kV rms * 14 Rated lightning impulse withstand voltage a) To earth kV rms 325 b) Across open switching device kV rms * kV rms As per IEC standard kV rms E1 mm As per IEC standard As Per IEC standard Min 1800 15 Rated switching impulse withstand voltage a) To earth b) Across open switching device Electrical Endurance 16 Minimum creepage distance 17 Minimum electrical clearances a) Between phases mm 1200 b) Between phase and earth mm >650 mm As per attached drawing. 18 Phase to phase spacing adopted in the layout 19 Operating mechanism Motor drive (Both Manually and Electrically driven) a) No. per disconnector 1 b) Motor operating supply VDC 110 c) Rated output of motor W * d) Maximum starting current A * e) Operating times Guaranteed Particulars TECHNICAL SPECIFICATION PEP 24 - 058 REPLACEMENT OF 66KV ISOLATORS DATE 3/11/2023 66 kV Disconnector - TECHNICAL SPECIFICATION SHEET Description Unit Particular Requirement No i. Opening * ii. Closing * 20 Interlock between main switch with earthing switch Electrical and Manual 21 Auxiliary switches i. Number and rating (Disconnector) ii. 8 Normally Closed and 8 Normally Open (for CEC use). 40-110VDC / 100220VAC Earth switch (Status indication) Yes 22 Control cabinet a) Thickness of sheet metal b) Enclosure protection c) Enclosure heating power consumption at 220 V AC W * d) Painting - Synthetic enamel paint of approved shade oC 90 - * - Copper and Copper alloy As per IEC standard 23 Maximum temperature of current carrying parts when carrying rated current continuously mm 3 IP 65 as per IEC 60529 24 Type of material of current carrying parts a) Type of main and arcing contacts b) Material of contacts i. Main Mechanical Endurance c) Whether contacts are silver plated, Yes / No M1 - Yes, shall be more than 25 microns Guaranteed Particulars TECHNICAL SPECIFICATION PEP 24 - 058 REPLACEMENT OF 66KV ISOLATORS DATE 3/11/2023 66 kV Disconnector - TECHNICAL SPECIFICATION SHEET Description Unit Particular Requirement No 25 Torque required to operate each pole N Guaranteed Particulars * 26 Insulator data (for complete stack) a) Type Porcelain b) No. of units One (01) c) Height of stack 27 Total weight of disconnector 28 Outline drawing supplied mm * Kg * - Yes, include pdf and CAD drawings 29 Independent testing authority certificates held to prove type test ratings to IEC requirements Yes, to be provided 30 Isolator to suit existing structure 31 Provide Clamps 32 Number of disconnectors Yes Set as necessary per phase (conductor sizes for Cu 124mmsq) Yes 10 Line disconnectors complete with earth switches. 18 disconnectors without earth switches. Note: Items marked (*) to be furnished along with the bid and appropriately filled in under the column marked “Guaranteed particulars”. 6. Factory Acceptance Tests CEC Engineers or its’ nominated representatives shall witness the factory acceptance tests for the isolators before being delivered to CEC, Kitwe, Zambia. TECHNICAL SPECIFICATION PEP 24 - 058 REPLACEMENT OF 66KV ISOLATORS DATE 3/11/2023 PROJECT MANAGER G DAKA 3/11/2023 Head - System Maintenance J SILWEYA 3/11/2023 TECHNICAL SPECIFICATION PEP 24 - 058 REPLACEMENT OF 66KV ISOLATORS DATE 3/11/2023 SYSTEM MAINTENANCE 66KV ISOLATOR REPLACEMENT ( PEP24- 058 ) No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 CIRCUITS MBBI/BBI Avenue - Mimbula TEE 66kV line unic Avenu -Bancroft 66kV Line Kabundi - Luano 66kV Line Kabundi - Stadium 66kV Line Nkana - CSS 1 66kV line Nkana - CSS 2 66kV line Nkana - Bus section Isolator No. 1 Fikondi Tx 2 Bus Section Isolator Kansuswa - Kankoyo 1 66kV Line Kansuswa - Kankoyo 2 66kV Line Kansuswa - Mufulira 66kV Line Kankoyo - Muf West 66kV Line Roan - Tx 2 66kV Bus Section Isolator Roan - Luanshya Munic 66kV Bus section Roan - Iwin 66kV Bus bar Isolator Roan - Tx 4 66kV Bus section isolator Luanshya Munic - Storke 66kV Busbar Totals Subtotal RBBI 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 QUANTITY 18 10 10 10 28 SUMMARY OF QUANTITIES 1 1 1 1 1 1 1 1 1 1 16 18 Grand totals DESCRIPTION Old Busbar Isolators Old Line Isolators c/w Earth switches Line Isolator/Earth switch Comments Old isolators Old isolators Old isolators Old isolators Old isolators Old isolators Old isolators Old isolators Old isolators Old isolators Old isolators Old isolators Old isolators Old isolators Old isolators Old isolators Old isolators
