PROVISION OF SERVO STABILIZER AND ISOLATION TRANSFORMER FOR CERTAIN LOCATION AT AF STN GORAKHPUR UNDER GE(AF) GORAKHPUR.

Supply, installation, testing and commissioning of Servo Controlled Voltage Stabilizer(confirming to BIS 9815 :1994, reaffirmation 2019 incl latest amendments). Three phase,four wire (RYBN), 50 Hz, Naturally Oil cooled, indoor, unbalanced type, copper wound,metallic body duly power coated with lifting hooks two nos, digital display type, relay free smooth and silent operation with 1st filling of Transformer oil up to the required level having following specifications :- Capacity 500 KVA Make : APLAB/VENER-7/SINETRAC/VINITEC or Techno-commercially equivalent makes as approved by GE. (a) Capacity - 500 KVA,(b) Type - Suitable for unbalanced load and unbalanced input,(c) Input voltage – 360 V to 480 V, Input frequency 50 Hz,(d) Output voltage - Stabilized at 415 V+/- 1% without Spikes,(e) Rated frequency - 50 Hz,(f) Wave form distortion - Nil,(g) Response time - Not to exceed 10 milli seconds & PF at full load shall not exceed 0.95,(h) Sensitivity - (+/-) 1%,(j) Rate of correction - Not less than 50 Volts/Second between phase and neutral without under/over shooting.,(k) Efficiency – Not Less than 98% & shall be free from distortion in wave forms,(l) Type of load three phase, unbalanced type,(m) Metering - Digital display Voltmeter/Ammeter with multi-functional meter,(n) Operating temperature - For indoor use upto max ambient temp + 55°C,(o) Class of insulation - Class F,(p) Mode of operation - Automatic/manual,(q) Winding Temperature rise - Max 55°C (10°C above operating temp),(r) Transformer oil - IS 335 marked, Oil Capacity – As per IS/OEM.,(s) Core - CRGO M4 Grade/CRNO (Cold Roll Grain Oriented)/ (Cold Rolled Non-Oriented),(t) Auto transformer (Variac) - 100 percent Copper wound Electrolytic Grade, (u) Losses - As per IS Norms,(v) Power Factor - Not less than 0.95,(w) Protections with Indications & Alarm Systems :(i) Over load protections,(ii) Short Circuit protections,(iii) High/Low voltage cut off,(iv) By pass arrangement in case of Emergency,(v) Single phase sequence change /phase fail protection,(vi) Earth fault protection,(x) Standard Fittings & Accessories :(i) Name, Rating & Terminal Marking plate,(ii) Digital Temperature Indicator.,(iii) Plain Unidirectional CI Rollers.,(iv) Lifting Lugs.,(v) Earthing Terminals.,(vi) Oil Level Gauge.,(vii) Control Panel.,(viii) Automatic Module.,(ix) Cooling Radiators etc.,(y) Other Fittings & Accessories :(i) Input/Incoming side 4P, MCCB, 630 A, 36 KA Breaking Capacity, Ics = 100% Icu suitable for 500 KVA Servo Voltage Stabilizer.,(ii) Output/Outgoing Side Heavy Duty Power Contactor of rating/type suitable for 500 KVA Servo Voltage Stabilizer.

Supply, installation, testing and commissioning of Servo Controlled Voltage Stabilizer(confirming to BIS 9815 :1994, reaffirmation 2019 incl latest amendments). Three phase,four wire (RYBN), 50 Hz, Naturally Oil cooled, indoor, unbalanced type, copper wound,metallic body duly power coated with lifting hooks two nos, digital display type, relay free smooth and silent operation with 1st filling of Transformer oil up to the required level having following specifications :- Capacity 200 KVA Make : APLAB/VENER-7/SINETRAC/VINITEC or Techno-commercially equivalent makes as approved by GE. (a) Capacity - 200 KVA,(b) Type - Suitable for unbalanced load and unbalanced input,(c) Input voltage – 360 V to 480 V, Input frequency 50 Hz,(d) Output voltage - Stabilized at 415 V+/- 1% without Spikes,(e) Rated frequency - 50 Hz,(f) Wave form distortion - Nil,(g) Response time - Not to exceed 10 milli seconds & PF at full load shall not exceed 0.95,(h) Sensitivity - (+/-) 1%,(j) Rate of correction - Not less than 50 Volts/Second between phase and neutral without under/over shooting.,(k) Efficiency – Not Less than 98% & shall be free from distortion in wave forms,(l) Type of load three phase, unbalanced type,(m) Metering - Digital display Voltmeter/Ammeter with multi-functional meter,(n) Operating temperature - For indoor use upto max ambient temp + 55°C,(o) Class of insulation - Class F,(p) Mode of operation - Automatic/manual,(q) Winding Temperature rise - Max 55°C (10°C above operating temp),(r) Transformer oil - IS 335 marked, Oil Capacity – As per IS/OEM.,(s) Core - CRGO M4 Grade/CRNO (Cold Roll Grain Oriented)/ (Cold Rolled Non-Oriented),(t) Auto transformer (Variac) - 100 percent Copper wound Electrolytic Grade, (u) Losses - As per IS Norms,(v) Power Factor - Not less than 0.95,(w) Protections with Indications & Alarm Systems :(i) Over load protections,(ii) Short Circuit protections,(iii) High/Low voltage cut off,(iv) By pass arrangement in case of Emergency,(v) Single phase sequence change /phase fail protection,(vi) Earth fault protection,(x) Standard Fittings & Accessories :(i) Name, Rating & Terminal Marking plate,(ii) Digital Temperature Indicator.,(iii) Plain Unidirectional CI Rollers.,(iv) Lifting Lugs.,(v) Earthing Terminals.,(vi) Oil Level Gauge.,(vii) Control Panel.,(viii) Automatic Module.,(ix) Cooling Radiators etc.,(y) Other Fittings & Accessories :(i) Input/Incoming side 4P, MCCB, 400 A, 36 KA Breaking Capacity, Ics = 100% Icu suitable for 200 KVA Servo Voltage Stabilizer.,(ii) Output/Outgoing Side Heavy Duty Power Contactor of rating/type suitable for 200 KVA Servo Voltage Stabilizer.

Supply, installation, testing and commissioning of Servo Controlled Voltage Stabilizer(confirming to BIS 9815 :1994, reaffirmation 2019 incl latest amendments). Three phase,four wire (RYBN), 50 Hz, Naturally Oil cooled, indoor, unbalanced type, copper wound,metallic body duly power coated with lifting hooks two nos, digital display type, relay free smooth and silent operation with 1st filling of Transformer oil up to the required level having following specifications :- Capacity 100 KVA Make : APLAB/VENER-7/SINETRAC/VINITEC or Techno-commercially equivalent makes as approved by GE. (a) Capacity - 100 KVA,(b) Type - Suitable for unbalanced load and unbalanced input,(c) Input voltage – 360 V to 480 V, Input frequency 50 Hz,(d) Output voltage - Stabilized at 415 V+/- 1% without Spikes,(e) Rated frequency - 50 Hz,(f) Wave form distortion - Nil,(g) Response time - Not to exceed 10 milli seconds & PF at full load shall not exceed 0.95,(h) Sensitivity - (+/-) 1%,(j) Rate of correction - Not less than 50 Volts/Second between phase and neutral without under/over shooting.,(k) Efficiency – Not Less than 98% & shall be free from distortion in wave forms,(l) Type of load three phase, unbalanced type,(m) Metering - Digital display Voltmeter/Ammeter with multi-functional meter,(n) Operating temperature - For indoor use upto max ambient temp + 55°C,(o) Class of insulation - Class F,(p) Mode of operation - Automatic/manual,(q) Winding Temperature rise - Max 55°C (10°C above operating temp),(r) Transformer oil - IS 335 marked, Oil Capacity – As per IS/OEM.,(s) Core - CRGO M4 Grade/CRNO (Cold Roll Grain Oriented)/ (Cold Rolled Non-Oriented),(t) Auto transformer (Variac) - 100 percent Copper wound Electrolytic Grade, (u) Losses - As per IS Norms,(v) Power Factor - Not less than 0.95,(w) Protections with Indications & Alarm Systems :(i) Over load protections,(ii) Short Circuit protections,(iii) High/Low voltage cut off,(iv) By pass arrangement in case of Emergency,(v) Single phase sequence change /phase fail protection,(vi) Earth fault protection,(x) Standard Fittings & Accessories :(i) Name, Rating & Terminal Marking plate,(ii) Digital Temperature Indicator.,(iii) Plain Unidirectional CI Rollers.,(iv) Lifting Lugs.,(v) Earthing Terminals.,(vi) Oil Level Gauge.,(vii) Control Panel.,(viii) Automatic Module.,(ix) Cooling Radiators etc.,(y) Other Fittings & Accessories :(i) Input/Incoming side 4P, MCCB, 250 A, 36 KA Breaking Capacity, Ics = 100% Icu suitable for 100 KVA Servo Voltage Stabilizer.,(ii) Output/Outgoing Side Heavy Duty Power Contactor of rating/type suitable for 100 KVA Servo Voltage Stabilizer.

S&F of Voltage stabilizer for automatic operation,three phase naturally oil cooled indoor type & designed for input variation between 340 V to 460 V with output voltage stabilized at 415 with accuracy ± 2.5% and speed of correction 8 Volts per second and of capacity 10 KVA complete all as specified and directed. Make : APLAB/VENER-7/SINETRAC/VINITEC or Techno-commercially equivalent makes as approved by GE.

Supply , Installation, testing and commissioning of indoor type of oil cooled isotation transformer 100 KVA step-III, IS-2026 Three phase, metalic body unbalanced type, copper wound with standard fitings and accessiones, input voltage of 415 volt , output voltage 415 volt IP-42, vector group Dyn-11, of frequency 50Hz and with following description including first fill of transformer Oil IS 335 ISI marked :-(a) Method of cooling air cooled (b) Rato-1:1 (c) Insulation class-Class E (d) Winding Temperature-Less than 55 C (e) Full load losses Less than 5% (f) No load tosses Less than 0.5%(h) Potential difference between Earth to Neutral voltage- Less than 01 volt Nate:- (a) in addtion to the above all standard fittings to be provided as per ISI noms.

Supply , Installation, testing and commissioning of outdoor type of oil cooled isotation transformer 75 KVA step-III, IS-2026 Three phase, metalic body unbalanced type, copper wound with standard fitings and accessiones, input voltage of 415 volt , output voltage 415 volt IP-42, vector group Dyn-11, of frequency 50Hz and with following description including first fill of transformer Oil IS 335 ISI marked :-(a) Method of cooling air cooled (b) Rato-1:1 (c) Insulation class-Class E (d) Winding Temperature-Less than 55 C (e) Full load losses Less than 5% (f) No load tosses Less than 0.5%(h) Potential difference between Earth to Neutral voltage- Less than 01 volt Nate:- (a) in addtion to the above all standard fittings to be provided as per ISI noms.

Supply , Installation, testing and commissioning of indoor type of oil cooled isotation transformer 10 KVA step-III, IS-2026 single phase, metalic body unbalanced type, copper wound with standard fitings and accessiones, input voltage of 220 volt , output voltage 220 volt IP-42, vector group Dyn-11, of frequency 50Hz and with following description including first fill of transformer Oil IS 335 ISI marked :-(a) Method of cooling air cooled (b) Rato-1:1 (c) Insulation class-Class E (d) Winding Temperature-Less than 55 C (e) Full load losses Less than 5% (f) No load tosses Less than 0.5%(h) Potential difference between Earth to Neutral voltage- Less than 01 volt Nate:- (a) in addtion to the above all standard fittings to be provided as per ISI noms.

Excavation in trenches n. exc 1.5 m wide and n.exc 1.5 m in depth and getting out soft/loose soil complete all as specified and as directed for laying of under ground cable, foundation of pole and stay etc. complete all as specified and as directed

Returning, filling in, including spreading, levelling, watering and well remmining in layers not exc 25 cm.

Removing excavated material n.exc 50 m and depositing where directed at a level n. exc 1.5 m above the starting point all as directed.