Transformer

POWER TRANSFORMER

Transformers are one of the primary components for the transmission and distribution of electrical energy. The scope of transformer types starts with generator transformers and ends with distribution transformers. Transformers which are directly connected to the generator of the power stations are called generator transformers. Energypac’s standard range goes up to 520MVA and 400kV. The connection between the different high voltage system levels is made via network transformers. Energypac is able to offer network transformers up to 520MVA, 400kV.

Designed to withstand short circuit forces acts radially and axially during faults.
High efficiency is ensured by implementing the technology of magnetic material and CU conductor.
Thermally upgraded insulation paper(Class A) results in Long
Lower PD value, lower sound level
High withstanding capability against TOV, lightning strikes, switching phenomenon, over flux conditions.
Leakproof, pressure, and vacuum tested as per standard.

Technical Specifications For

POWER TRANSFORMERS UP TO 36kV, 2.5MVA – 47MVA
POWER TRANSFORMERS UP TO 400kV, 520MVA
GENERATOR STEP-UP (GSU) TRANSFORMERS UP TO 400kV, 520MVA
AUTO TRANSFORMERS/ GRID CONNECTED TRANSFORMERS UP TO 400kV, 520MVA

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POWER TRANSFORMERS UP TO 36kV, 2.5MVA – 47MVA

** This is only exemplary; specifications will vary based on individual client requirements

Applied Standard		IEC - 60076
Type		Outdoor
Rated Power	MVA	ONAN/ONAF, 2.5MVA - 47MVA
Number of Phases		3
Rated Voltage, Phase to Phase
High Voltage Winding	kV	36
Low Voltage Winding	kV	12
Rated Frequency	Hz	50
Rated Insulation Level
Impulse Withstand, Full Wave
High Voltage Winding	kV	170
Low Voltage Winding	kV	75
Neutral Side		Full insulation
AC Withstand Voltage
High Voltage Winding	kV	70
Low Voltage Winding	kV	28
Impedance Voltage at 75°C and at Nominal Ratio and 100% Rated Power	%	As per IEC 76-5/ as required
Vector Diagram (IEC 76-4)		Dyn1/Dyn11
Type of Cooling		ONAN/ONAF
On load Tap- changer
Type		With oil/ vacuum switches
Rated Tap	kV	36
Tapping Range Capacity	%	(+10 to -10)% or as required
Tapping Range Capacity	Positions	17 or higher
Temperature Rise at Rated Power (Maximum Ambient Temperature: 40°C)
Oil by Thermometer	deg. C	55
Winding by Resistance Measurement	deg. C	60
Maximum Hot Spot Temperature when Loaded in Accordance with IEC 354	deg. C	118
Core Loss at Rated Frequency and Rated Voltage at Nominal Tap	kW	As required
Copper Loss at Full Load, at Rated Frequency	kW	As required
Overall Dimension	mm	Based on design specification
Overall Weight	kg	Based on design specification
Transport Weight	kg	Based on design specification

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POWER TRANSFORMERS UP TO 400kV, 520MVA

** This is only exemplary; specifications will vary based on individual client requirements

Applied Standard		IEC – 60076
Type		Outdoor
Rated Power	MVA	ONAN/ONAF, up to 520MVA
Number of Phases		3
Rated Voltage, Phase to Phase
High Voltage Winding	kV	132 or 230 or 400kV
Low Voltage Winding	kV	12 or 36
Rated Frequency	Hz	50
Rated Insulation Level
Impulse Withstand, Full Wave
High Voltage Winding	kV	As per IEC 76-3
Low Voltage Winding	kV	As per IEC 76-3
Neutral Side		Full insulation
AC Withstand Voltage
High Voltage Winding	kV	As per IEC 76-3
Low Voltage Winding	kV	As per IEC 76-3
Impedance Voltage at 75°C and at Nominal Ratio and 100% Rated Power	%	As per IEC 76-5/ as required
Vector Diagram (IEC 76-4)		Dyn1/Dyn11
Type of Cooling		ONAN/ONAF
On load Tap- changer
Type		With oil/ vacuum switches
Rated Tap	kV	132 or 230 or 400kV
Tapping Range Capacity	%	(+10 to -10)% or as required
Tapping Range Capacity	Positions	17 or higher
Temperature Rise at Rated Power (Maximum Ambient Temperature: 40°C)
Oil by Thermometer	deg. C	55
Winding by Resistance Measurement	deg. C	60
Maximum Hot Spot Temperature when Loaded in Accordance with IEC 354	deg. C	118
Core Loss at Rated Frequency and Rated Voltage at Nominal Tap	kW	As required
Copper Loss at Full Load, at Rated Frequency	kW	As required
Overall Dimension	mm	Based on design specification
Overall Weight	kg	Based on design specification
Transport Weight	kg	Based on design specification

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GENERATOR STEP-UP (GSU) TRANSFORMERS UP TO 400kV, 520MVA

** This is only exemplary; specifications will vary based on individual client requirements

Applied Standard		IEC – 60076
Type		Outdoor
Rated Power	MVA	ONAN/ONAF, up to 520MVA
Number of Phases		3
Rated Voltage, Phase to Phase
High Voltage Winding	kV	132 or 230 or 400kV
Low Voltage Winding	kV	12 or 36
Rated Frequency	Hz	50
Rated Insulation Level
Impulse Withstand, Full Wave
High Voltage Winding	kV	As per IEC 76-3
Low Voltage Winding	kV	As per IEC 76-3
Neutral Side		Graded insulation
AC Withstand Voltage
High Voltage Winding	kV	As per IEC 76-3
Low Voltage Winding	kV	As per IEC 76-3
Impedance Voltage at 75°C and at Nominal Ratio and 100% Rated Power	%	As per IEC 76-5/ as required
Vector Diagram (IEC 76-4)		YNd1
Type of Cooling		ONAN/ONAF
On load Tap- changer
Type		With oil/ vacuum switches
Rated Tap	kV	132 or 230 or 400kV
Tapping Range Capacity	%	(+10 to -10)% or as required
Tapping Range Capacity	Positions	17 or higher
Temperature Rise at Rated Power (Maximum Ambient Temperature: 40°C)
Oil by Thermometer	deg. C	55
Winding by Resistance Measurement	deg. C	60
Maximum Hot Spot Temperature when Loaded in Accordance with IEC 354	deg. C	118
Core Loss at Rated Frequency and Rated Voltage at Nominal Tap	kW	As required
Copper Loss at Full Load, at Rated Frequency	kW	As required
Overall Dimension	mm	Based on design specification
Overall Weight	kg	Based on design specification
Transport Weight	kg	Based on design specification

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AUTO TRANSFORMERS/ GRID CONNECTED TRANSFORMERS UP TO 400kV, 520MVA

** This is only exemplary; specifications will vary based on individual client requirements

Applied Standard		IEC - 60076
Type		Outdoor
Rated Power	MVA	ONAN/ONAF, up to 520MVA
Number of Phases		3
Rated Voltage, Phase to Phase
High Voltage Winding	kV	132 or 230 or 400kV
Low Voltage Winding	kV	36 or 132 or 230kV
Tertiary Winding	kV	12 or 36
Rated Frequency	Hz	50
Rated Insulation Level
Impulse Withstand, Full Wave
High Voltage Winding	kV	As per IEC 76-3
Low Voltage Winding	kV	As per IEC 76-3
Neutral Side		Graded insulation
AC Withstand Voltage
High Voltage Winding	kV	As per IEC 76-3
Low Voltage Winding	kV	As per IEC 76-3
Impedance Voltage btn MV-HV at 75°C and at Nominal Ratio and 100% Rated Power	%	As per IEC 76-5/ as required
Vector Diagram (IEC 76-4)		YNa0d1
Type of Cooling		ONAN/ONAF
On load Tap- changer
Type		With oil/ vacuum switches
Rated Tap	kV	170
Tapping Range Capacity	%	(+10 to -10)% or as required
Tapping Range Capacity	Positions	17 or higher
Temperature Rise at Rated Power (Maximum Ambient Temperature: 40°C)
Oil by Thermometer	deg. C	50
Winding by Resistance Measurement	deg. C	55
Maximum Hot Spot Temperature when Loaded in Accordance with IEC 354	deg. C	118
Core Loss at Rated Frequency and Rated Voltage at Nominal Tap	kW	As required
Copper Loss at Full Load, at Rated Frequency	kW	As required
Overall Dimension	mm	Based on design specification
Overall Weight	kg	Based on design specification
Transport Weight	kg	Based on design specification

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DISTRIBUTION TRANSFORMER-OIL FILLED

Transformers from 5kVA to 2500kVA and up to 36kV on the high voltage side and 3.6kV on the low voltage side are referred to as distribution transformers. In the last step, they distribute the electrical energy to the consumers by feeding from the high-voltage into the low-voltage distribution network. These are designed either as liquid-filled or as dry-type transformers.

Power rating from 5kVA to 2500kVA
Type Test certification for 5000 kVA Transformer
Available with both OCTC and OLTC
Cooling Type: ONAN, ONAF both can be provided
33/11 kV; 33/11 kV; 11/.415 kV products are manufactured mainly but effective solutions are provided if the client requires them.
Cooling Material: Mineral oil and synthetic ester oil

Technical Specifications For

OIL TYPE DISTRIBUTION TRANSFORMERS
DRY TYPE DISTRIBUTION TRANSFORMERS

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OIL TYPE DISTRIBUTION TRANSFORMERS

** This is only exemplary; specifications will vary based on individual client requirements

Rated power	Max. rated volt. HV side	Impedance voltage	50% Load	100% Load	Material
[kVA]	[kV]	[%]	[W]	[W]
100	12	4.5	435	1500	Copper
		4.5	475	1650	Copper
		4.5	520	1800	Copper
	24	4.5	455	1575	Copper
		4.5	500	1730	Copper
		4.5	545	1890	Copper
	36	4.5	470	1610	Copper
		4.5	510	1770	Copper
		4.5	560	1940	Copper
160	12	4.5	570	1700	Copper
		4.5	670	1950	Copper
		4.5	770	2200	Copper
	24	4.5	600	1790	Copper
		4.5	700	2050	Copper
		4.5	810	2300	Copper
	36	4.5	610	1830	Copper
		4.5	720	2100	Copper
		4.5	827	2370	Copper
200	12	4.5	670	2100	Copper
		4.5	780	2300	Copper
		4.5	890	2700	Copper
	24	4.5	705	2200	Copper
		4.5	820	2410	Copper
		4.5	935	2830	Copper
	36	4.5	720	2260	Copper
		4.5	840	2470	Copper
		4.5	955	2900	Copper
250	12	4.5	920	2700	Copper
		4.5	980	2930	Copper
		4.5	1050	3150	Copper
	24	4.5	966	2835	Copper
		4.5	1030	3075	Copper
		4.5	1100	3310	Copper
	36	4.5	990	2900	Copper
		4.5	1055	3150	Copper
		4.5	1130	3385	Copper
315	12	4.5	955	2750	Copper
		4.5	1025	3100	Copper
		4.5	1100	3275	Copper
	24	4.5	1000	2890	Copper
		4.5	1075	3255	Copper
		4.5	1155	3440	Copper
	36	4.5	1025	2960	Copper
		4.5	1100	3335	Copper
		4.5	1180	3520	Copper
400	12	4.5	1150	3330	Copper
		4.5	1225	3450	Copper
		4.5	1300	3875	Copper
	24	4.5	1205	3500	Copper
		4.5	1285	3620	Copper
		4.5	1365	4070	Copper
	36	4.5	1235	3580	Copper
		4.5	1315	3710	Copper
		4.5	1400	4170	Copper
500	12	4.5	1430	4100	Copper
		4.5	1510	4300	Copper
		4.5	1600	4750	Copper
	24	4.5	1500	4300	Copper
		4.5	1585	4515	Copper
		4.5	1680	4990	Copper
	36	4.5	1535	4405	Copper
		4.5	1625	4620	Copper
		4.5	1720	5110	Copper
630	12	4.5	1745	4850	Copper
		4.5	1860	5300	Copper
		4.5	2000	5855	Copper
	24	4.5	1835	5090	Copper
		4.5	1355	5565	Copper
		4.5	2100	6145	Copper
	36	4.5	1875	5210	Copper
		4.5	2000	5700	Copper
		4.5	2150	6290	Copper
800	12	4.5	1510	6050	Copper
		4.5	1600	6400	Copper
		4.5	1710	6855	Copper
	24	4.5	1585	6350	Copper
		4.5	1680	6720	Copper
		4.5	1795	7200	Copper
	36	4.5	1625	6500	Copper
		4.5	1720	6880	Copper
		4.5	1840	7370	Copper
1000	12	5	2620	7000	Copper
		5	2790	7700	Copper
		5	3000	9000	Copper
		5	2800	10200	Copper
	24	5	2750	7350	Copper
		5	2930	8085	Copper
		5	3150	9450	Copper
	36	5	2815	7525	Copper
		5	3000	8280	Copper
		5	3225	9675	Copper
1250	12	5	3220	8400	Copper
		5	3300	9200	Copper
		5	3600	10750	Copper
	24	5	3380	8820	Copper
		5	3465	9660	Copper
		5	3780	11290	Copper
	36	5	3460	6500	Copper
		5	3550	6880	Copper
		5	3870	7370	Copper
1600	12	6.25	3970	11300	Copper
		6.25	4200	11800	Copper
		6.25	4500	13500	Copper
	24	6.25	4170	11865	Copper
		6.25	4410	12390	Copper
		6.25	4725	14175	Copper
	36	6.25	4270	12150	Copper
		6.25	4515	12685	Copper
		6.25	4840	14515	Copper
2000	12	6.25	4790	14100	Copper
		6.25	5050	15000	Copper
		6.25	5400	17000	Copper
	24	6.25	5030	14800	Copper
		6.25	2300	15750	Copper
		6.25	5670	17850	Copper
	36	6.25	5150	15160	Copper
		6.25	5430	16130	Copper
		6.25	5805	18280	Copper
2500	12	6.25	5900	17500	Copper
		6.25	6150	18500	Copper
		6.25	6500	20000	Copper
	24	6.25	6195	18380	Copper
		6.25	6455	19430	Copper
		6.25	6825	21000	Copper
	36	6.25	6340	18810	Copper
		6.25	6610	19890	Copper
		6.25	6990	21500	Copper

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DRY TYPE DISTRIBUTION TRANSFORMERS

** This is only exemplary; specifications will vary based on individual client requirements

Rated power	Rated voltage	Impedance	Loss at 50% load	Loss at 100% load	Material
[kVA]	[kV]	[%]	[W]	[W]
100	12	4	590	2370	Aluminium
		4	660	2650	Copper
		4.5	435	1500	Copper
		4.5	475	1650	Copper
		4.5	520	1800	Copper
	24	4.5	455	1575	Copper
		4.5	500	1730	Copper
		4.5	545	1890	Copper
	36	4.5	470	1610	Copper
		4.5	510	1770	Copper
		4.5	560	1940	Copper
160	12	4.5	570	1700	Copper
		4.5	670	1950	Copper
		4.5	770	2200	Copper
		5	745	2980	Aluminium
		5	750	3030	Copper
	24	4.5	600	1790	Copper
		4.5	700	2050	Copper
		4.5	810	2300	Copper
	36	4.5	610	1830	Copper
		4.5	720	2100	Copper
		4.5	827	2370	Copper
200	12	4	900	3600	Copper
		4.5	670	2100	Copper
		4.5	780	2300	Copper
		4.5	890	2700	Copper
		5	800	3200	Copper
		5	860	3450	Aluminium
	24	4.5	705	2200	Copper
		4.5	820	2410	Copper
		4.5	935	2830	Copper
	36	4.5	720	2260	Copper
		4.5	840	2470	Copper
		4.5	955	2900	Copper
250	12	4.5	920	2700	Copper
		4.5	980	2930	Copper
		4.5	1050	3150	Copper
		5	965	3850	Copper
		5	1190	4750	Aluminium
	24	4.5	966	2835
		4.5	1030	3075
		4.5	1100	3310
	36	4.5	990	2900
		4.5	1055	3150
		4.5	1130	3385
		6	1300	5200
315	12	4.5	955	2750	Copper
		4.5	1025	3100	Copper
		4.5	1100	3275	Copper
		4.5	1250	5000	Copper
		5	1340	5350	Aluminium
		6	1120	4470	Copper
	24	4.5	1000	2890	Copper
		4.5	1075	3255	Copper
		4.5	1155	3440	Copper
		5	1250	5000	Copper
	36	4.5	1025	2960	Copper
		4.5	1100	3335	Copper
		4.5	1180	3520	Copper
400	12	4.5	1150	3330	Copper
		4.5	1225	3450	Copper
		4.5	1300	3875	Copper
		5	1050	4200	Copper
		5	1545	6180	Aluminium
		6	1320	5300	Copper
	24	4.5	1205	3500	Copper
		4.5	1285	3620	Copper
		4.5	1365	4070	Copper
	36	4.5	1235	3580	Copper
		4.5	1315	3710	Copper
		4.5	1400	4170	Copper
500	12	4.5	1430	4100	Copper
		4.5	1510	4300	Copper
		4.5	1600	4750	Copper
		5	1725	6900	Copper
		5	1750	7000	Aluminium
		5	1800	7200	Copper
	24	4.5	1500	4300	Copper
		4.5	1585	4515	Copper
		4.5	1680	4990	Copper
	36	4.5	1535	4405	Copper
		4.5	1625	4620	Copper
		4.5	1720	5110	Copper
630	12	4.5	1745	4850	Copper
		4.5	1860	5300	Copper
		4.5	2000	5855	Copper
		5	1800	7200	Copper
		5	2035	8150	Aluminium
	24	4.5	1835	5090	Copper
		4.5	1355	5565	Copper
		4.5	2100	6145	Copper
	36	4.5	1875	5210	Copper
		4.5	2000	5700	Copper
		4.5	2150	6290	Copper
800	12	4.5	1510	6050	Copper
		4.5	1600	6400	Copper
		4.5	1710	6855	Copper
		5	2325	9300	Aluminium
	24	4.5	1585	6350	Copper
		4.5	1680	6720	Copper
		4.5	1795	7200	Copper
	36	4.5	1625	6500	Copper
		4.5	1720	6880	Copper
		4.5	1840	7370	Copper
1000	12	5	2620	7000	Copper
		5	2790	7700	Copper
		5	3000	9000	Copper
		5	2675	10700	Aluminium
		5	2800	10200	Copper
		5	2870	11500	Copper
		6	2600	10400	Copper
		6	3075	12300	Copper
	24	5	2750	7350	Copper
		5	2930	8085	Copper
		5	3150	9450	Copper
	36	5	2815	7525	Copper
		5	3000	8280	Copper
		5	3225	9675	Copper
1250	12	5	3220	8400	Copper
		5	3300	9200	Copper
		5	3600	10750	Copper
		5	2730	10950	Copper
		5	3200	12800	Aluminium
	24	5	3380	8820	Copper
		5	3465	9660	Copper
		5	3780	11290	Copper
	36	5	3460	6500	Copper
		5	3550	6880	Copper
		5	3870	7370	Copper
1600	12	6	4200	16800	Aluminium
		6.25	3970	11300	Copper
		6.25	4200	11800	Copper
		6.25	4500	13500	Copper
		6.25	4270	17100	Copper
	24	6.25	4170	11865	Copper
		6.25	4410	12390	Copper
		6.25	4725	14175	Copper
	36	6.25	4270	12150	Copper
		6.25	4515	12685	Copper
		6.25	4840	14515	Copper
2000	12	6	4875	19500	Aluminium
		6.25	4790	14100	Copper
		6.25	5050	15000	Copper
		6.25	4000	16000	Copper
		6.25	5400	17000	Copper
		6.25	4350	17400	Copper
		7	4875	19500	Copper
	24	6.25	5030	14800	Copper
		6.25	2300	15750	Copper
		6.25	5670	17850	Copper
	36	6.25	5150	15160	Copper
		6.25	5430	16130	Copper
		6.25	5805	18280	Copper
		6.25	5150	20600	Copper
2500	12	6	5625	22500	Copper
		6	5775	23100	Aluminium
		6.25	5900	17500	Copper
		6.25	6150	18500	Copper
		6.25	6500	20000	Copper
		6.25	5375	21500	Copper
		6.25	5625	22500	Copper
		6.5	5000	20000	Copper
	24	6.25	6195	18380	Copper
		6.25	6455	19430	Copper
		6.25	6825	21000	Copper
	36	6.25	6340	18810	Copper
		6.25	6610	19890	Copper
		6.25	6990	21500	Copper

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DISTRIBUTION TRANSFORMER-DRY TYPE

Energypac offers a full range of dry-type transformers up to 10MVA, with 36kV on the high voltage side and 12kV on the low voltage side. These are built according to all major standards including IEC, IS and ANSI and when required as per the loss directives of ECBC-2018. To minimize environmental contamination and fire hazard, customers are specifying dry-type transformers more frequently. These transformers meet strict parameters with respect to electrical system demands and functioning in areas with extreme climatic conditions. Energypac refers to its dry type distribution transformer as "cast resin transformer." Moreover, Energypac's cast resin transformers are virtually maintenance free and are manufactured in accordance with industry and international standards including ISO 9001.

Self extinguishing material
Compact footprint and environment friendly
Easy installation
Maintenance free
Designed to withstand the highest mechanical short circuit stress that may occur during operation
High voltage coil windings are cast to prevent humidity
High resistance against overvoltage
Low decibel, high capacity and high performance
Low partial discharge

Technical Specifications For

DISTRIBUTION TRANSFORMER, CAST RESIN, UP TO 36kV
DISTRIBUTION TRANSFORMER, CAST RESIN, UP TO 36kV (AS PER ECBC)

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DISTRIBUTION TRANSFORMER, CAST RESIN, UP TO 36kV (AS PER ECBC)

Rated Power

Rated Voltage

Impedance

Loss at 50% load

Loss at 100% load

Material

Remarks

[kVA]

[kV]

[%]

[W]

100

940

1120

2400

Copper

On request

160

1290

1420

3300

Copper

On request

200

1500

1750

3800

4000

Copper

On request

250

1700

1970

4320

4600

Copper

On request

315

2000

2400

5040

Copper

On request

400

2380

2900

6040

6800

Copper

On request

500

2800

3300

7250

7800

Copper

On request

630

3340

3950

8820

9200

Copper

On request

800

3880

4650

10240

11400

Copper

On request

1000

4500

5300

12000

12800

Copper

On request

1250

6.25

5190

6250

13870

14500

Copper

On request

1600

6.25

6320

7500

16800

18000

Copper

On request

2000

6.25

7500

8880

20000

21400

Copper

On request

2500

6.25

9250

10750

24750

26500

Copper

On request

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SPECIAL APPLICATION TRANSFORMER

Transformers of other applications are available upon requests of customers.

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POWER TRANSFORMERS UP TO 36kV, 2.5MVA – 47MVA

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POWER TRANSFORMERS UP TO 400kV, 520MVA

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AUTO TRANSFORMERS/ GRID CONNECTED TRANSFORMERS UP TO 400kV, 520MVA

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DISTRIBUTION TRANSFORMER-DRY TYPE

DISTRIBUTION TRANSFORMER, CAST RESIN, UP TO 36kV

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DISTRIBUTION TRANSFORMER, CAST RESIN, UP TO 36kV (AS PER ECBC)

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SPECIAL APPLICATION TRANSFORMER

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