66 110 220kV Oil-immersed Power Transformer

Specifications Economic or deluxe solution optional

Better cost performance

IEC Standards Criteria

New factory for better price

NVTC/ OLTC

REFERENCES   ISO 1461: Hot dip galvanized coatings on fabricated iron and steel articles – Specifications and test methods. IEC 60076: Power transformers. IEC 60044: Instrument transformers. IEC 60296: Specification for unused mineral insulating oil for transformers and Switchgear. IEC 60354: Loading guide for oil – immersed power transformers. IEC 60214: Tap-changers - Part 1: Performance requirements and test methods, Part 2: Application guide. IEC 60512: Connectors for electronic equipment.   Performance  

66kV Two-Winding Power Transformer With NVTC/OLTC
Rated Capacity (kVA)	Rated Voltage (kV)			Vector Group	Losses (W)		Impedance Voltage (%)
	HV	Tapping Range	LV		No load	On load
630	63 66 69	±5%	6.3 6.6 10.5 11	Yd11	1360	7560	8.0
800					1620	8830
1000					1920	10440
1250					2260	12340
1600					2720	14850
2000					3200	17550
2500					3760	20700
3150				YNd11	4480	24300
4000					5280	28800
5000					6240	32400
6300		±2×2.5%			8000	36000	9.0
8000					9600	42750
10000					11360	50400
12500					13360	59850
16000					16080	73530
20000					19040	89100
25000					22480	105300
31500					26720	126900
40000					32000	148950
50000					37760	184500
63000					44880	222300

             

110kV Two-Winding Power Transformer With NVTC/OLTC
Rated Capacity  (kVA)	Rated Voltage (kV)			Vector  Group	Losses (W)		Impedance  Voltage  (%)
	HV	Tapping  Range	LV		No load	On load
6300	110 121	±2×2.5%	6.3 6.6 10.5 11	YNd11	8000	36900	10.5
8000					9600	45000
10000					11200	53100
12500					13200	63000
16000					16000	77400
20000					19000	93600
25000					22400	110700
31500					26700	133200
40000					31800	156600
50000					37600	194400
63000					44600	234000

 

110kV Three-Winding Power Transformer With   NVTC/OLTC
Rated Capacity  (kVA)	Rated Voltage (kV)			Vector  Group	Losses (W)		Impedance Voltage (%)
	HV	Tapping  Range	LV		No load	On load	Step Up	Step Down
6300	110 ±2×2.5%   121 ±2×2.5%	35 38.5 ±2×2.5%	6.3 6.6 10.5 11	YNyn0d11	9600	47700	HV-MV 17-18 HV-LV 10.5 MV-LV 6.5	HV-MV 10.5 HV-LV 17-18 MV-LV 6.5
8000					11500	56700
10000					13600	66600
12500					16000	78300
16000					19300	95400
20000					22800	112500
25000					27000	133200
31500					32000	157500
40000					38200	189000
50000					45200	225000
63000					53600	270000

 

220kV Two-Winding Power Transformer With NVTC/OLTC
Rated  Capacity  (kVA)	Rated Voltage  (kV)		Vector Group	Losses (W)		Impedance  Voltage  (%)
	HV	LV		No load	On load
31500	220 ±2×2.5%	6.3	YNd11	29000	135000	12-14
40000		6.6		35000	158000
50000		10.5		41000	189000
63000		11		49000	221000
90000		10.5		65000	288000
120000		13.8 11		80000	347000
150000		11		96000	405000
180000		13.8		109000	459000
240000		15.75		136000	567000
300000		15.75		160000	675000
360000		18		184000	774000

 

220kV Three-Winding Power Transformer With   NVTC/OLTC
Rated Capacity  (kVA)	Rated Voltage  (kV)			Vector  Group	Losses (W)		Impedance  Voltage (%)		Capacity Arrange (%)
	HV	MV	LV		No load	On load	Step Up	Step Down
31500	220 ±2×2.5%	69 121	6.3  6.6	YNyn0d11	34000	162000	HV-MV 22-24 HV-LV 12-14 MV-LV 7-9	HV-MV 12-14 HV-LV  22-24 MV-LV 7-9	100/100/100 100/50/100 100/100/50
40000			10.5  11		40000	189000
50000			35		48000	225000
63000			38.5		56000	261000
90000			10.5  11 13.8		73000	351000
120000			35 38.5		90000	432000
150000			11    13.8		106000	513000
180000			15.75    35		121000	585000
240000			38.5		149000	720000

   ROUTINE TEST to IEC 60076 (to be done during acceptance testing at factory)   • Measurement of winding resistance • Ratio test • Vector group • Separate source voltage withstand test • Induced over-voltage • Insulation resistance • Oil leakage test on fully assembled transformer for 12 hours • Measurement of impedance voltage • Magnetic balance • Measurement of no-load loss and current • Measurement of load loss (at normal & extreme taps) • Tests on on-load tap-changer • Tests on on-load tap-changer remote control panel • Efficiency at 50%, 75%, 100% loading at unity p.f and rated terminal voltage (Corrected to 75C) • Lightning impulse withstand test   Type Tests to IEC 60076 (to be done during acceptance testing at factory)   • Temperature rise test – To be performed on one unit during acceptance testing. Lightning Impulse Withstand Test is already listed under Routine Tests as per IEC 60076.      Test Facility

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