400kv/220kv/11kv 40mva Three Phase Three Winding Power Transformer

• Application: Power
• Phase: Three
• Core: Core-type Transformer
• Cooling Method: Oil-immersed Type Transformer
• Winding Type: Multi-winding Transformer
• Certification: ISO9001-2000, ISO9001
• Model NO.: OSFSZ
• Usage: Single-phase Transformer, Rectifier Transformer, Combined Transformer, Power Transformer, Distribution Transformer
• Frequency Characteristics: High Frequency
• Transport Package: Wooden
• Specification: 400KV/330KV
• Trademark: HEMG
• Origin: China
• Production Capacity: 100

Product Description

 

	K. 400/200kV POWER TRANSFORMERS (AIS-AIS)	UNIT	DATA
			Required	Offered
1	POWER TRANSFORMER
1.1	Manufacturer & Place of manufacturing			HEMG
1.2	Type designation			OSFSZ-200000/400
1.3	Type
	Three phase Autotransformer, oil-immersed, core type with tertiary winding			Yes
1.4	Standards			IEC 60076, 60137, 60214
1.5	Altitude	m		216
1.6	Ambient temperature
	- Maximum	ºC		40
	- Annual average	ºC		30
1.7	Mounting			Outdoor
1.8	Rated voltage ratio	kV		400
				220
				11
1.9	Rated frequency	Hz		50
1.1	Vector group (3 phase group connection)			YNa0d11
1.11	Cooling- 2-stage			ONAN/ ONAF1/ ONAF2
1.12	Function of tertiary winding (TV)			Aux. supply
1.13	Method of earthing
	- HV winding			Solid
	- LV winding			Solid
	- TV winding			-
1.14	Type of windings (graded/ non-graded)
	- HV winding (Series)			Graded
	- LV winding (Common)			Graded
	- TV winding			Non-graded
1.15	Rated voltage of windings (Ur)
	- HV winding	kV		400
	- LV winding	kV		220
	- TV winding	kV		11
	Note*: approximate; to manufacturer's preference
1.16	Highest voltage for equipment (Um)
	- HV winding	kV		420
	- LV winding	kV		245
	- TV winding	kV		12
1.17	Rated lightning impulse withstand voltage at:
	- HV terminal	kV		1425
	- LV terminal	kV		1050
	- Neutral terminal	kV		480
	- TV winding			75
1.18	Rated switching impulse voltage
	- HV terminal	kV		1050
	- LV terminal	kV		850
1.19	Rated power frequency withstand voltage at
	- HV terminal (design value)	kV		630
	- HV test value (ACLD U1)	kV		436
	- HV test value (ACLD U2 PD measurement)	kV		388
	- LV terminal (design value)	kV		460
	- Neutral terminal	kV		70
	- TV terminal	kV		28
1.2	Rated power at site conditions (ONAF2 or OFAF), HV & LV	MVA		200
1.21	Rated power at site conditions (ONAN)	MVA		120
1.22	Rated power of tertiary at site conditions (Full cooling)	MVA		70
1.23	Maximum temperature rise at rated power at:
	- Windings	K		55
	Marikani
	- Hot spot of windings	K		68
	Marikani
	- Top oil	K		50
	Marikani
	- Oil at inlet of cooler	K		Approx 22
	- Oil at outlet of cooler	K		Approx 50
	- Core	K		Approx 75
1.24	Temperature of winding due to short circuit duration of 2s at rated load
	- HV side short circuit rating of 31.5kA	ºC		250
	- LV side short circuit rating of 31.5kA	ºC		250
1.25	No-load losses at rated voltage and rated frequency	kW		45
1.26	Load losses at 75ºC, and rated frequency:
	- ONAF2 or OFAF rated power and principal tapping			288
	- ONAF2 or OFAF rated power and maximum voltage ratio
	- ONAF2 or OFAF rated power and minimum voltage ratio			278
	-  At ONAN rated power and principal tapping
				350
				105
1.27	Total auxiliary losses at fully load	kW		Approx 10
1.28	Maximum current density at rated power:
	- HV winding	A/mm^2		Approx 2.0
	- LV winding	A/mm^2		Approx 2.0
	- TV winding	A/mm^2		Approx 3.6
	- Tapping	A/mm^2		Approx 3.6
1.29	Symmetrical short circuit through current (duration 2s) at system fault rating
	- HV terminals (31.5kA)	kA		31.5
	- LV terminals (31.5kA)			31.5
1.3	Magnetising current (HV winding)
	- At 90% rated voltage	A		Approx0.7
	- At 100% rated voltage	A		Approx0.9
	- Ar 110% rated voltage	A		Approx6.8
1.31	Maximum flux density in iron at rated voltage, power frequency and principal tapping at:
	- Wound limbs	T		Approx1.7
	- Unwound limbs	T		Approx1.7
	- Yokes	T		Approx1.7
	- Shields	T		Approx1.7
1.32	Maximum flux density in iron at power frequency, principal tapping and 105% rated voltage at:
	- Wound limbs	T		Approx 1.78
	- Unwound limbs	T		Approx 1.78
	- Yokes	T		Approx 1.78
	- Shields	T		Approx 1.78
1.33	Type pf tap changing		On-load	On-load
1.34	Manufacturer of on-load tap changer			MR
1.35	Type designation of on-load tap changer			M500-72.5/C-10193W
1.36	Tapped winding		HV	HV
1.37	Type of flux voltage variation		V.F.V.V	V.F.V.V
1.38	Tapping range		-1	-1
1.39	Tapping step		1.25%	1.25%
1.4	Number of steps (positions)		16 (17)	16 (17)
1.41	Arrangement of tappings (Linear, Coarse/ Fine, Reversing)			Reversing
1.42	Automatic voltage control		Yes	Yes
1.43	HV - LV Impedance voltage range at 75°C, rated frequency and full rating:
	- At principal tapping	%	>14%	>14%
	- At maximum voltage ratio	%	>14%	>14%
	- At minimum voltage ratio	%	>14%	>14%
1.44	Impedance voltage HV-TV (principle tapping) at 70MVA	%		Approx 22.5
1.45	Resistance of winding at 75ºC and principal tapping:
	- HV side	Ω/phase		Approx 0.53
	- LV side	Ω/phase		Approx 0.58
	- TV	Ω/phase		Approx 0.029
1.46	Terminal connection
	- HV terminal		Outdoor bushing	Outdoor bushing
	- LV terminal		Outdoor bushing	Outdoor bushing
	- Neutral terminal		Outdoor bushing	Outdoor bushing
	- TV terminal		Outdoor bushing	Outdoor bushing
1.47	Bushing Creepage Distance (IEC class IV=31mm/kV)
	- HV terminal (420kV)	mm	13020	13020
	- LV terminal (245kV)	mm	7595	7595
	- Neutral terminal (36kV)	mm	≥900	≥900
	- TV terminal (12kV)	mm	372	372
1.48	Cable box insulation
	- HV terminal		N/A	N/A
	- LV terminal		"	N/A
	- HV Neutral terminal		"	N/A
	- LV Neutral terminal		"	N/A
	- Tertiary		"	N/A
1.49	Isolating links for test purposes
	- HV terminal		N/A	N/A
	- LV terminal		"	N/A
	- Tertiary terminal		"	N/A
1.5	Current transformers
	HV- Bushing turrets		Refer to Tender Drawings
	- Number of cores			3
	- Rated extended primary current			500, 1000/500, 1000/500
	- Ratio (TR= turns ratio)
	•I core	A		500/1
	•II core	A		1000/500/1
	•III core	A		1000/500/1
	- Class
	•I core			5P20
	•II core			5P20
	•III core			5P20
	- Knee point voltage (Ek)
	•I core	V		1665
	•II core	V		3330/ 1665
	• III core	V		3330/ 1665
	- Exciting current (IE) at EK
	•I core	mA		Will provide measured value
	•II core	mA		Will provide measured value
	•III core	mA		Will provide measured value
	- Rated output (Burden to be 25-100% rated burden)
	•I core	VA		30
	•II core	VA		30
	•III core	VA		30
	LV line (Only AIS connections)
	- Number of cores			3
	- Rated extended primary current			1500, 750,750
	- Ratio (TR= turns ratio)		"	1500/750/1; 750/1; 750/1
	- Class		"	5P20
	- Knee point voltage (Ek)		"	4995, 2498, 2498
	- Exciting current (IE) at Ek		"	Will provide measured value
	- Rated output (Burden to be 25-100% rated burden)		"	30
	Neutral (HV REF)
	- Number of cores			1
	- Rated extended primary current			500
	- Ratio (TR= turns ratio)
	* I core	A		500/1
	- Class
	* I core			5P20
	- Knee point voltage (Ek)
	* I core	V		1665
	- Exciting current (IE) at Ek
	* I core	mA		Will provide measured value
	- Rated output (Burden to be 25-100% rated burden)
	* I core	VA		15
	Neutral - ends
	- Number of cores			1
	- Rated extended primary current			500
	- Ratio (TR= turns ratio)
	•I core	A		500/1
	- Class
	•I core			5P20
	- Knee point voltage (Ek)
	•I core	V		1665
	- Exciting current (IE) at Ek
	•I core	mA		Will provide measured value
	- Rated output (Burden to be 25-100% rated burden)
	•I core	VA		15
	All class PX CTs shall have a rated secondary current, ISN	A		1
	Tertiary
	- Number of cores			N/A
	- Rated extended primary current	A		N/A
	- Ratio (TR= turns ratio)
	* I core			N/A
	* II core			N/A
	- Class
	* I core			N/A
	* II core			N/A
	- Knee point voltage (Ek)
	* I core	V		N/A
	* II core	V		N/A
	- Exciting current (IE) at Ek
	* I core	mA		N/A
	* II core	mA		N/A
	- Rated output (Burden to be 25-100% rated burden)
	* I core	VA		N/A
	* II core	VA		N/A
1.51	Number of coolers per transformer			Approx 10
1.52	Number of stand-by coolers			N/A
1.53	Number of stand-by fans			1
1.54	Rating of each cooler	kW		0.75
1.55	Oil
	- Manufacturer			Nynas Nitro
	- Type designation			GBN1
	- Standards		IEC 60296	IEC 60296
	- Minimum flash point	ºC		140
	- Viscosity
	* at 20ºC	mm^2/s		IEC 60296
	* at 50ºC	mm^2/s		IEC 60296
	* at 80ºC	mm^2/s		IEC 60296
	- Maximum dielectric strength for 1 min.	kV		70
	- Dielectric factor			0.005
	- Acidity (neutralization value)	mgKOH/g		0.01
1.56	Oil preservation system		Air-bag	Air-bag
1.57	Types and arrangement of winding:
	- HV winding			Disc
	- LV winding			Disc
	- TV winding			Disc
	- Regulating			Disc
	- Windings arrangement (i.e. Core/ TV/ LV/ HV/ Taps)			Core/ TV/Taps/ LV/ HV/
1.58	Conductor material (e.g., copper, work hardened copper, etc.)
	- HV windings			Work hardened copper
	- LV windings			Work hardened copper
	- TV windings			Work hardened copper
	- Regulating windings			Work hardened copper
	- Connecting leads from winding to tap changer			Work hardened copper
1.59	Conductor insulation:
	- HV windings			Paper
	- LV windings			Paper
	- TV windings			Paper
	- Regulating windings			Paper
	- Connecting leads from winding to tap changer			Paper
1.6	Calculated thermal time constant
	- ONAN cooling	min		Oil:210 windings:10
	- Full cooling	min		Oil:90 windings:7
1.61	Oil circulation (i.e., natural/ partially directed/ directed)
	To the windings:
	- HV windings (Series)			Natural
	- LV windings (Common)			Natural
	- Regulating windings			Natural
	- TV windings			Natural
	Through the windings:
	- HV windings (Series)			Derected
	- LV windings (Common)			Derected
	- Regulating windings			Natural
	- TV windings			Derected
1.62	Core construction:
	- Taped/ banded/ bolted limbs			Banded limbs
	- Taped/ banded bolted yokes			Banded yokes
	- Taping / banding material			Epoxy-bound bandage
	- Number of limbs			3
	- Number of limbs wound			3
	- Type of joint in magnetic core (90% butt, overlap, mitre, etc.)			Overlap
	- Type of core steel			23RK85
	- Specific loss of core steel at 1.5 tesla	W/kg		Approx 0.7
1.63	Thickness of transformer tank
	- Sides	mm		10
	- Bottom	mm		10
	- Top	mm		25
1.64	Material of transformer tank			Q235
1.65	Thickness of radiator plates	mm		1
1.66	Total volume of conservator	Litre		Approx 4000
1.67	Minimum volume of conservator between highest and lowest levels as percentage of total cold oil at 15ºC volume of transformer		7.50%	7.50%
1.68	Volumetric expansion of oil from 0ºC to 90ºC	m^3		Approx 5.7
1.69	Pressure increase inside tank due to expansion of oil			N/A
1.7	Masses of transformer
	- Core and coils	kg		Approx 93000
	- Total mass excluded oil	kg		Approx 140000
	- Oil mass  * in tank	kg		Approx 61000
	* in radiators	kg		Approx 2500
	* total	kg		Approx 81000
	- Total mass	kg		Approx 221000
1.71	Mass of transformer as arranged for transport (heaviest part)	kg		Approx 120000
1.72	Dimensions of transformer arranged for transport
	- Height	m
	- Width	m
	- Length	m
1.73	Filling medium of transformer tank for shipment			Dry air
1.74	Maximum sound pressure level (NEMA TR1- 5dB(A))	dB(A)	82	82
1.75	Conservator vessel, radiators, fan grilles, control boxes or cubicles and pipework anticorrosion protection		Hot dip galvanized and painted	Hot dip galvanized and painted
1.76	Tank anticorrosion protection			Painted
1.77	Supply voltage for transformer auxiliaries	V	415/ 240 AC	415/ 240 AC
1.78	Control/ Protection voltage	V	110 DC	110 DC
1.79	Manufacturer quality assurance		Yes	Yes
	- According to ISO 9000, 9001, 9002, 9003 and 9004		validity	validity
1.8	Type test certificate to be issued by:
	- Independent laboratory or independently witnessed type test certificate		Yes	Yes
1.81	Special Tests to be performed:
	As Type test= T
	As Routine test= R
	- Dielectric test- Chopped wave lightning impulse		Yes (R)	Yes (R)
	- Dielectric test- Short duration AC (ACSD)		No	No
	- Measurement of zero-sequence impedance		N/A	N/A
	- Determination of sound levels		Yes (T)	Yes (T)
	- Measurement of harmonics of no-load current		Yes (R)	Yes (R)
	- Measurement of power of fan motors & oil pumps		Yes (T)	Yes (T)
	- Determination of capacitance, windings to earth and between windings		Yes (R)	Yes (R)
	- Measurement of insulation resistance to earth and loss angle of insulation system capacitances		Yes (R)	Yes (R)
	- Vibration test		No	No