SPECIAL REPAIR/REPLACEMENT OF BER TRANSFORMERS UNDER GE SHILLONG

Amount

Supply, install, testing and commissioning of step down outdoor type copper wound, Oil immersed transformer of capacity 315 KVA (Level-3) complete (Plateform mounted) with standard fitting, HT 11KV, 3 Phase, LT 433 volts, 3 phase 4 wire (Dyn11) with off load tap changer 5 steps with range +7.5 to -7.5% in steps of 2.5% on HT side to vary secondary voltage all as per IS:1180 (Level-3) complete all as specified and as directed. (1) Technical Details : (a) No load Voltage Ratio (Normal Tap) - 11000/433 V (b) Number of phases : Three (c) Frequency : 50 Hz (d) Type of Cooling : ONAN (e) Winding connections : The primary winding (HV) shall be connected in delta and secondary winding (LV) shall be connected in star. (f) Vector Group : Windings shall be connected as per Vector symbol : Dyn11 (g) Neutral Earthing : The neutral point of Secondary (LV) winding shall be brought out to a separate insulated terminal and shall be solidly earthed. (h) Off Load Tap Changer of the transformer : Voltage tapping range on H.V. side will be (+7.5%) to (-7.5%) in steps of 2.5%. The tap changing switch shall be located in a convenient position so that it can be operated from ground level. The switch handle shall be provided with a locking arrangement along with tap position, enabling the switch to be locked in position. The tap position marking should increase in clockwise direction and there should be a back stopper in between tap position 1(+7.5%) & 7(-7.5%). (j) The percentage impedance at 75°C & 50 Hz refer to the (normal) principal Tapping shall be less than 4.5%. (k) Losses : Minimum losses as per IS:1180, Level-3. (l) Buchholz relay

(2) Structural Details : The transformer shall be comprising of the following items :- (a) Externally hand operated off-circuit Tap Changer switch with position indicator and locking device. (b) Conservator with Oil gauge, filling Hole with plug and drain hole with plug. (c) Undercarriage with four plain rollers. (d) Oil filling hole cum air release plug. (e) Drain Valve cum sampling valve. (f) Filter valve with Plug. (g) Lifting Lugs for Transformers. (h) Lifting lugs for Lid. (j) Earthing Terminals. (k) Thermometer Pocket (l) Silicagel Breather (m) Inspection Cover. (n) Explosion Vent. (o) 6 inches Dial type Thermometer with alarm, trip contacts and maximum temperature indicator with Metal Guard. (p) Rating Plate and Diagram Plate. Note: (i) Any standard accessories not mentioned above but forming part of standard model by manufacturer deemed to be included in the quoted rate. (ii) Loading/Unloading of transformers including connections and testing, commissioning at site deemed to be included in the quoted rate. (iii) The contractor should get the make and GA drg approved from GE before placing order. (iv) Factory inspection shall be carried out by rep of AO before dispatch from factory.

Supply, install, testing and commissioning of step down outdoor type copper wound, Oil immersed transformer of capacity 250 KVA (Level-3) complete (Plateform mounted) with standard fitting, HT 11KV, 3 Phase, LT 433 volts, 3 phase 4 wire (Dyn11) with off load tap changer 5 steps with range +7.5 to -7.5% in steps of 2.5% on HT side to vary secondary voltage all as per IS 1180 Level-3, complete all as specified and as directed. (1) Technical Details : (a) No load Voltage Ratio (Normal Tap) - 11000/433 V (b) Number of phases : Three (c) Frequency : 50 Hz (d) Type of Cooling : ONAN (e) Winding connections : The primary winding (HV) shall be connected in delta and secondary winding (LV) shall be connected in star. (f) Vector Group : Windings shall be connected as per Vector symbol : Dyn11 (g) Neutral Earthing : The neutral point of Secondary (LV) winding shall be brought out to a separate insulated terminal and shall be solidly earthed. (h) Off Load Tap Changer of the transformer : Voltage tapping range on H.V. side will be (+7.5%) to (-7.5%) in steps of 2.5%. The tap changing switch shall be located in a convenient position so that it can be operated from ground level. The switch handle shall be provided with a locking arrangement along with tap position, enabling the switch to be locked in position. The tap position marking should increase in clockwise direction and there should be a back stopper in between tap position 1(+7.5%) & 7(-7.5%). (j) The percentage impedance at 75 °C & 50 Hz refer to the (normal) principal Tapping shall be less than 4.5%. (k) Losses : Minimum losses as per IS 1180 Level-3. (l) Buchholz relay

(2) Structural Details : The transformer shall be comprising of the following items :- (a) Externally hand operated off-circuit Tap Changer switch with position indicator and locking device. (b) Conservator with Oil gauge, filling Hole with plug and drain hole with plug. (c) Undercarriage with four plain rollers. (d) Oil filling hole cum air release plug. (e) Drain Valve cum sampling valve. (f) Filter valve with Plug. (g) Lifting Lugs for Transformers. (h) Lifting lugs for Lid. (j) Earthing Terminals. (k) Thermometer Pocket (l) Silicagel Breather (m) Inspection Cover. (n) Explosion Vent. (o) 6 inches Dial type Thermometer with alarm, trip contacts and maximum temperature indicator with Metal Guard. (p) Rating Plate and Diagram Plate. Note: (i) Any standard accessories not mentioned above but forming part of standard model by manufacturer deemed to be included in the quoted rate. (ii) Loading/Unloading of transformers including connections and testing, commissioning at site deemed to be included in the quoted rate. (iii) The contractor should get the make and GA drg approved from GE before placing order. (iv) Factory inspection shall be carried out by rep of AO before dispatch from factory.

Supply, install, testing and commissioning of step down outdoor type copper wound, Oil immersed transformer of capacity 200 KVA (Level-3) complete (Plateform mounted) with standard fitting, HT 11KV, 3 Phase, LT 433 volts, 3 phase 4 wire (Dyn11) with off load tap changer 5 steps with range +7.5 to -7.5% in steps of 2.5% on HT side to vary secondary voltage all as per IS 1180 Level-3, complete all as specified and as directed. (1) Technical Details : (a) No load Voltage Ratio (Normal Tap) - 11000/433 V (b) Number of phases : Three (c) Frequency : 50 Hz (d) Type of Cooling : ONAN (e) Winding connections : The primary winding (HV) shall be connected in delta and secondary winding (LV) shall be connected in star. (f) Vector Group : Windings shall be connected as per Vector symbol : Dyn11 (g) Neutral Earthing : The neutral point of Secondary (LV) winding shall be brought out to a separate insulated terminal and shall be solidly earthed. (h) Off Load Tap Changer of the transformer: Voltage tapping range on H.V side will be (+7.5%) to (-7.5%) in steps of 2.5%. The tap changing switch shall be located in a convenient position so that it can be operated from ground level. The switch handle shall be provided with a locking arrangement along with tap position, enabling the switch to be locked in position. The tap position marking should increase in clockwise direction and there should be a back stopper in between tap position 1(+7.5%) & 7(-7.5%). (j) The percentage impedance at 75°C & 50 Hz refer to the (normal) principal Tapping shall be less than 4.5%. (k) Losses : Minimum losses as per IS 1180. (l) Buchholz relay

(2) Structural Details : The transformer shall be comprising of the following items :- (a) Externally hand operated off-circuit Tap Changer switch with position indicator and locking device. (b) Conservator with Oil gauge, filling Hole with plug and drain hole with plug. (c) Undercarriage with four plain rollers. (d) Oil filling hole cum air release plug. (e) Drain Valve cum sampling valve. (f) Filter valve with Plug. (g) Lifting Lugs for Transformers. (h) Lifting lugs for Lid. (j) Earthing Terminals. (k) Thermometer Pocket (l) Silicagel Breather (m) Inspection Cover. (n) Explosion Vent. (o) 6 inches Dial type Thermometer with alarm, trip contacts and maximum temperature indicator with Metal Guard. (p) Rating Plate and Diagram Plate. Note: (i) Any standard accessories not mentioned above but forming part of standard model by manufacturer deemed to be included in the quoted rate. (ii) Loading/Unloading of transformers including connections and testing, commissioning at site deemed to be included in the quoted rate. (iii) The contractor should get the make and GA drg approved from GE before placing order. (iv) Factory inspection shall be carried out by rep of AO before dispatch from factory.

Supply, install, testing and commissioning of step down outdoor type copper wound, Oil immersed transformer of capacity 160 KVA (Level-3) complete (Plateform mounted) with standard fittings, HT 11KV, 3 Phase, LT 433 volts, 3 phase 4 wire (Dyn11) with off load tap changer 5 steps with range +7.5 to -7.5% in steps of 2.5% on HT side to vary secondary voltage all as per IS 1180 Level-3, complete all as specified and directed. (1) Technical Details : (a) No load Voltage Ratio (Normal Tap) - 11000/433 V (b) Number of phases : Three (c) Frequency : 50 Hz (d) Type of Cooling : ONAN (e) Winding connections : The primary winding (HV) shall be connected in delta and secondary winding (LV) shall be connected in star. (f) Vector Group : Windings shall be connected as per Vector symbol : Dyn11 (g) Neutral Earthing : The neutral point of Secondary (LV) winding shall be brought out to a separate insulated terminal and shall be solidly earthed. (h) Off Load Tap Changer of the transformer : Voltage tapping range on H.V. side will be (+7.5%) to (-7.5%) in steps of 2.5%. The tap changing switch shall be located in a convenient position so that it can be operated from ground level. The switch handle shall be provided with a locking arrangement along with tap position, enabling the switch to be locked in position. The tap position marking should increase in clockwise direction and there should be a back stopper in between tap position 1(+7.5%) & 7(-7.5%). (j) The percentage impedance at 75°C & 50 Hz refer to the (normal) principal Tapping shall be less than 4.5%. (k) Losses : Minimum losses as per IS 1180 Level-3. (l) Buchholz relay.

(2) Structural Details : The transformer shall be comprising of the following items :- (a) Externally hand operated off-circuit Tap Changer switch with position indicator and locking device. (b) Conservator with Oil gauge, filling Hole with plug and drain hole with plug. (c) Undercarriage with four plain rollers. (d) Oil filling hole cum air release plug. (e) Drain Valve cum sampling valve. (f) Filter valve with Plug. (g) Lifting Lugs for Transformers. (h) Lifting lugs for Lid. (j) Earthing Terminals. (k) Thermometer Pocket (l) Silicagel Breather (m) Inspection Cover. (n) Explosion Vent. (o) 6 inches Dial type Thermometer with alarm, trip contacts and maximum temperature indicator with Metal Guard. (p) Rating Plate and Diagram Plate. Note: (i) Any standard accessories not mentioned above but forming part of standard model by manufacturer deemed to be included in the quoted rate. (ii) Loading/Unloading of transformers including connections and testing, commissioning at site deemed to be included in the quoted rate. (iii) The contractor should get the make and GA drg approved from GE before placing order. (iv) Factory inspection shall be carried out by rep of AO before dispatch from factory.

Supply, install, testing and commissioning of step down outdoor type copper wound, Oil immersed transformer of capacity 100 KVA (Level-3) complete (Plateform mounted) with standard fitting, HT 11KV, 3 Phase, LT 433 volts, 3 phase 4 wire (Dyn11) with off load tap changer 5 steps with range +7.5 to -7.5% in steps of 2.5% on HT side to vary secondary voltage all as per IS 1180 Level-3, complete all as specified and directed. (1) Technical Details : (a) No load Voltage Ratio (Normal Tap) - 11000/433 V (b) Number of phases : Three (c) Frequency : 50 Hz (d) Type of Cooling : ONAN (e) Winding connections : The primary winding (HV) shall be connected in delta and secondary winding (LV) shall be connected in star. (f) Vector Group : Windings shall be connected as per Vector symbol : Dyn11 (g) Neutral Earthing : The neutral point of Secondary (LV) winding shall be brought out to a separate insulated terminal and shall be solidly earthed. (h) Off Load Tap Changer of the transformer : Voltage tapping range on H.V. side will be (+7.5%) to (-7.5%) in steps of 2.5%. The tap changing switch shall be located in a convenient position so that it can be operated from ground level. The switch handle shall be provided with a locking arrangement along with tap position, enabling the switch to be locked in position. The tap position marking should increase in clockwise direction and there should be a back stopper in between tap position 1(+7.5%) & 7(-7.5%). (j) The percentage impedance at 75°C & 50 Hz refer to the (normal) principal Tapping shall be less than 4.5%. (k) Losses : Minimum losses as per IS 1180. (l) Buchholz relay.

(2) Structural Details : The transformer shall be comprising of the following items :- (a) Externally hand operated off-circuit Tap Changer switch with position indicator and locking device. (b) Conservator with Oil gauge, filling Hole with plug and drain hole with plug. (c) Undercarriage with four plain rollers. (d) Oil filling hole cum air release plug. (e) Drain Valve cum sampling valve. (f) Filter valve with Plug. (g) Lifting Lugs for Transformers. (h) Lifting lugs for Lid. (j) Earthing Terminals. (k) Thermometer Pocket (l) Silicagel Breather (m) Inspection Cover. (n) Explosion Vent. (o) 6 inches Dial type Thermometer with alarm, trip contacts and maximum temperature indicator with Metal Guard. (p) Rating Plate and Diagram Plate. Note: (i) Any standard accessories not mentioned above but forming part of standard model by manufacturer deemed to be included in the quoted rate. (ii) Loading/Unloading of transformers including connections and testing, commissioning at site deemed to be included in the quoted rate. (iii) The contractor should get the make and GA drg approved from GE before placing order. (iv) Factory inspection shall be carried out by rep of AO before dispatch from factory.

Note for Item No 1.00 to 5.00) (1) All connections on LT side Box to be done with Brass Glands. (2) HT Boots to be provided on HT Studds to avoid any bare contact. (3) Necessary arrangement for factory inspection and testing at site to be born by the contractor. (4) Pre commissioning test after installation at site to be concluded by SEI and necessary testing arrangements to be done by the contractor.

Material and labour for earthing complete with Copper Plate Electrode 60 cm X 60 cm X 3.15 mm buried directly in ground vertically to a depth not less than 2.25 mtr deep below ground level with top edge of earth plate at a depth not less than 1.5 m below normal ground level connected to Copper Strip of size 20x3 mm Copper strip by means of bolts, check nuts and washers, galvanised steel and protected by GI pipe 40 mm bore light grade & connected to main switch board or main control board as directed and including concrete pit in PCC 1:3:6, type C1, precast RCC (1:2:4) type B1 cover slab 30 cm X 30 cm X 5 cm with 10mm dia TMT bars 8 cm C/c both ways and one handle for lifting made out of 8 mm dia TMT bar, funnel, wire mesh, 20mm bore galvanised iron pipe (medium grade) for watering, charcoal or coke and salt in alternative layers, necessary excavation and earth work in any type of soil and including necessary testing complete all as shown in Electrical Plate No 3 of SSR part -I complete all as specified and directed.

M&L for earth continuity conductor or main earthing lead fixed to wall on batten or recess or chases or buried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc. as required 32x6 mm Copper strip including taking down old unserviceable one complete all as specified and directed.

M&L for PCC 1:3:6, type C2 (using 40mm graded stone aggregates) as in foundation for stay set /Pole/ FPB etc including finishing the exposed surfaces even and fair without using extra cement including demolition of old one complete all as specified and directed.

M&L for brickwork in CM (1:4) using sub class B bricks straight or curved on plan exceeding 6 Mtr mean radius including demolition of old complete all as specified and directed.

M&L for 15mm thick rendering in cement mortar 1:4 on fair face of brick work, finished even & smooth without using extra cement complete all as specified and directed.

S&F cable jointing kit for 11 KV grade cable for outdoor termination, heat shrink type, joint complete with jointing material and accessories suitable for 3 core XLPE, armoured, Aluminium conductor cable of size 95 sqmm complete all as specified and directed.

S&F cable jointing kit for 11 KV grade cable for outdoor termination, heat shrink type, joint complete with jointing material and accessories suitable for 3 core XLPE, armoured, Aluminium conductor cable of size 120 sqmm to 185 sqmm complete all as specified and directed.

Excavation in trenches not exceeding 1.5m wide and not exceeding 1.5m depth and getting out in soft/loose soil to remove HT/LT cables from ground for taking out loops for increasing the length of cable for transformer connection complete all as specified and directed.

Returning, filling in, including spreading, leveling, watering and well ramming in layers not exceeding 25cm in soft/loose soil complete all as specified and directed.

Dismantling of old transfomer by disconnecting HT and LT side cables and earthings from Body and neutral and shifting from site to MES stores all as specified and directed.

Flint India

GEPS PROJECTS

Roy and Sons Infrastructers

MAHINDER ELECTRICALS