33kv Capacitor Voltage Transformer CVT PT 3 Phase Electric Power Meter High Accuracy for Prefab Substation

• Customization: Available
• Application: Power, Electronic, Instrument, Lighting, Rectifier, Audio
• Phase: Three
• Model NO.: Customized
• Core: Core-type Transformer
• Cooling Method: Oil-immersed Type Transformer
• Winding Type: Multi-winding Transformer
• Certification: ISO9001-2000, ISO9001, CCC, ISO14001, ISO45001, CQC, CE, UL, KEMA
• Usage: Single-phase Transformer, Rectifier Transformer, Combined Transformer, Power Transformer, Distribution Transformer
• Frequency Characteristics: Power Frequency
• Shape of Core: EI
• Brand: Qinghao or Customized
• Transformador Fabricado En China: Kv kVA Mva Transmission Distribution-Transformer
• Prefabricated Transformer Substation: Two Three Winding Outdoor Liquid Filled
• Customized Transformer: China Manufacturer Factory Supplier Vendor
• Hot Selling Transformer: Pad Mounted, Pole Mounted, Tap Changer,
• Top 10 Popular Products: Single Phase, Prefabricated Substation, Switchgear
• Low Medium High Voltage: IEC60076 / GB1094/ANSI/IEEE Standard
• Connection Vector Groups: Wye-Delta, Dyn1/Dyn11/Yyn0/Ynd1/Ynd11
• Rated Voltage: 10/20/33/0.4kv, 33/10kv
• Low Frequency: 50/60Hz
• Warranty: 24 Months
• Insulating Medium: Mineral Oil / Vegetable Oil
• Insulation Class/Cooling Ways: a-Class, Onan, Onaf, Knan, Ofat, Odaf
• Tapping Range: +/-2 X 2.5%(Customized), Nltc/Oltc
• Winding Coil Material: Copper / Aluminium
• Core Material: Silicon Steel / CRGO
• Transport Package: Wooden Case or Pallet
• Specification: 11kv, 22kv, 35kv, 50kva-3150kva
• Trademark: Qinghaobiandian
• Origin: China
• HS Code: 8504220000
• Production Capacity: 10000PCS/Year
• Package Size: 200.00cm * 120.00cm * 120.00cm
• Package Gross Weight: 2000.000kg

Product Description

Product Description

3-Phase Pole Mounted Oil Filled Power Distribution Transformer 300kVA 11/0.4kV Grid High Voltage Electric Transformer

Qinghao dry type and oil-immersed transformers (50kVA to 4000kVA) support high-voltage conversion (110kV, 500kV, 30/15 kV) for industrial grids, solar power converters, and bitcoin mining farms. Featuring 3-phase/single-phase distribution compatibility, 440V/400V/380V/110V/24V to 220V step-up/down flexibility, and encapsulated/toroidal designs, these units deliver 98% efficiency with ≤65dB noise. Ideal for compact substations, induction furnaces, and SMPS-driven systems requiring UL/IEC-certified isolation and overload protection.

Qinghao oil distribution transformer includes hermetically sealed, amorphous alloy, conservator type and on-load tap changer type, which is usually pole mounted or installed in distribution station for daily lighting and factory power whose LV output up to 0.4kV. Our distribution transformer rating is up to 2500kVA, and primary voltage up to 35kV. The corrugated tanks as thermal expansion and contraction component enable the transformer oil completely isolated with the atmosphere. Oil distribution transformer with primary voltage range of 6,10,10.5,11,20,22,24,33, 35,38.5kV can be manufactured according to customer requirements.

High efficiency, low loss, low noise, strong load resistance and long service life.

Main Characteristics:
1. Designed by patented technology and software with premium performance.
2. Core is made of high quality cold-rolled grain-oriented silicon steel sheet which produced in step-lap technology.
3. Winding is using high strength enameled wire or paper-insulated wire or copper belt, which offers uniform distribution of ampere-turns, reasonable insulation structure with high ability to withstand short-circuit.
4. Oil tank is corrugated type with high corrosion resistance. Tank surface pre-treatment liquid and coating powder adopts international top brands. The tank is degreasing, pickling, phosphorated, electrophoresis by automatic production lines, then power spray coating and heat-solidify.
5. The active part applies core free-hanging structure. The gasket is made of high-quality acrylate rubber which can inhibit ageing caused by sun and heat.

Technical Features
1. Toroidal & Lamination Cores: Ferrite cores for high-frequency applications (e.g., audio equipment, DC voltage reducers) and silicon steel lamination cores for distribution transformers (e.g., single-phase/three-phase pad-mounted units).
2. Specialized Models: EFD series for SMPS, flyback designs for 12V toroidal systems, and current limiting reactors for solar power grid stability. 
3. Critical Components: On-load tap changers (±10% voltage adjustment), 500kV bushings, and encapsulated windings for dust/moisture resistance in compact substation 4000 kva deployments. 

Advantages:
1. Low loss, low noise, low partial discharge, high reliability.
2. Safety with elegant appearance.
3. Convenient installation and simple maintenance.
4. Compact with small occupied area.

Applications
1. Renewable Energy: Solar power converters with 220V/380V step-up for grid-tied systems and DC voltage reducers for battery storage.
2. High-Power Demands: 4000kVA oil-immersed transformers for bitcoin mining farms, paired with current limiting reactors to prevent surge damage.
3. Niche Applications: 12V toroidal transformers for audio equipment, flyback control circuits for SMPS, and 1MVA 20kV/0.4kV units for industrial induction furnaces. 

Service environment:
1. Ambient temperature: Maximum +40ºC, Minimum -40ºC
2. Altitude: less than 1000 meters.
3. Seismic level: less than 3m/s2 at horizontal direction and less than 1.5m/s2 at vertical direction.
4. Installation environment: No obvious and heavy pollution, no explosive and corrosive gas and dust, with good air ventilation and no severe vibration and shock.
(Note: If the application environment is different from the above standard conditions, please contact for customized designs.)

Please check below quick links for other product types. 

 

Product Parameters

Parameter	Range
Capacity	50kVA, 630kVA, 1000kVA, 4000kVA, 1MVA
Voltage	220V, 380V, 110kV, 500kV, 30/15 kV
Cooling	Dry Type, Oil-Immersed, Air/Epoxy Encapsulated
Protection	Tap Changer, Current Limiting Reactor, BIL 45kV Bushing

The rated voltage 10kv 20kv 33kv can be customized as customers' requirements. For instant communication, please click .  

High Voltage:10(6,6.3,10.5,11)KV                               Connection Symbol:D,yn11 or Y,yn0                           Rated Frequency:50Hz/60Hz               Low Voltage:0.4(0.415,0.433)KV                                   Tapping Range of HV:±2x2.5%                                 Insulation Level:LI75 AC35/AC3
Rated power (KVA)	Short-Circuit Impedance(%)	S18 (W)			S13 (W)			S11 (W)			No-Load Current (%)	Sound pressure dB(A)	Weight (kg)	Overall Dimension(mm)
		No-Load Loss	On-Load Loss75ºC		No-Load Loss	On-Load Loss75ºC		No-Load Loss	On-Load Loss75ºC					L	W	H
			Dyn11	Yyn0		Dyn11	Yyn0		Dyn11	Yyn0
30	4.0	60	410	390	65	460	440	75	570	550	1.50	50	400	750	560	850
50		75	600	570	85	660	630	90	830	790	1.30	50	450	760	640	920
63		80	710	680	90	790	760	100	990	950	1.20	50	500	770	670	930
80		95	860	820	105	950	910	120	1190	1140	1.20	52	560	840	720	970
100		110	1040	980	125	1150	1090	135	1440	1360	1.10	52	610	870	730	1020
125		120	1240	1180	140	1370	1310	155	1720	1640	1.10	54	760	1040	810	1020
160		145	1510	1440	165	1680	1600	180	2100	2000	1.00	54	790	1100	830	1070
200		170	1790	1700	195	1990	1890	220	2480	2360	1.00	56	870	1190	880	1070
250		210	2090	2000	240	2330	2220	265	2910	2770	0.90	56	1020	1270	890	1070
315		245	2510	2390	280	2790	2660	310	3480	3320	0.90	58	1180	1330	940	1140
400		300	2960	2810	335	3290	3130	375	4110	3910	0.80	58	1350	1410	940	1210
500		350	3550	3370	390	3940	3750	440	4920	4680	0.80	60	1600	1500	1050	1350
630	4.5	420	4060		465	4510		520	5640		0.60	60	2080	1600	1100	1440
800		510	4910		575	5460		640	6820		0.60	62	2460	1670	1140	1460
1000		604	6740		680	7490		755	9360		0.60	62	2750	1700	1200	1490
1250		710	7860		795	8730		885	10910		0.50	65	3180	1870	1250	1510
1600		855	9490		960	10550		1065	13180		0.50	65	3730	1890	1290	1750
2000	5.0	990	11980		1115	13310		1240	16640		0.40	65	4560	2100	1300	1800
2500		1165	12150		1310	13490		1455	19270		0.40	67	5670	2150	1390	1980
Note: The above parameters are only for designing and selecting  reference, and the final parameters are subject to the actual product.

Detailed Photos

Main Components:

1. Core: Typically made of laminated steel sheets.
2. Windings: Primary Winding and Secondary Winding.
3. Insulation: To prevent electrical conductivity between windings and the core, and turns of the windings.
4. Tank: To house magnetic core and windings. 
5. Cooling System: Natural air cooling, forced air cooling, oil cooling with radiators, oil cooling with fans or heat exchangers.
6. Bushing: Maintain electrical isolation. 
7. Tap Changer: Maintain voltage stability despite fluctuations in load or input voltage.
8. Breather: Regulate the intake of air when the oil level expands and contracts due to temperature changes for oil transformer.
9. Conservator: Also called expansion tank to ensure the oil level remains constant in the main tank.

Packaging & Shipping

 

Company Profile

Qinghao Transformer is a reliable and specialized power transmission and distribution equipment manufacturer for over 20 years with a registered capital of USD8,000,000. Except for ISO9001, ISO14001, ISO45001 certificates, we are also TUV audited suppliers with AAA enterprise and AAA products honors.  All products comply with GB and IEC related standards. With the concept of "World-class transformers, smart solutions", Qinghao Transformer is devoting to provide high-quality power for customers. Let us cooperate with a brighter future!

Core Product Portfolio for Power Transmission & Distribution Systems: 1. 10kV-110kV Oil-Immersed Power Transformers High-Efficiency Series: S9, S11, S13, S15 with on-load voltage regulation capability.  Specialized Types: Explosion-proof transformers, mining-compliant transformers, anti-theft transformers, rectifier furnace transformers for harsh industrial applications.  2. Dry-Type Transformers Fire-Safe Models: SC(B)9(10), SG(B)10 series with H-class insulation, ideal for urban grid modernization and metro light rail power supply.  3. Amorphous Alloy Transformers Energy-Saving Technology: 70%+ no-load loss reduction, certified for rural power grid transformation projects.  4. Integrated Power Distribution Solutions Prefabricated Substations: Combined transformers & box-type substations for compact deployment. Switchgear Systems: High/low voltage switchgear cabinets, circuit breakers, cable branch boxes, metering unit, recloser for grid protection.

Application Sectors *Energy Generation: Nuclear/thermal power plants, grid transmission networks. *Industrial Facilities: Metallurgy, petrochemical plants, mining operations (high-resilience power supply). *Transportation: Electrified railways, metro systems, urban light rail traction power. *Public Infrastructure: Urban/rural grid retrofits, smart city projects, commercial complexes.

     

FAQ

Q: Are you a Manufacturer or Trading company?   
A: We are the original factory with approved export license.

Q: What's your warranty terms?
A: We offer 24 months warranty time. 

Q: How long is the production time?
A: 25 to 45 days or depending on order requirements.

Q: What should provide to make custom transformer?
A: Technical drawing and specification documents are the best, or you can list key parameters for designing.

Q: How can I trust you?
A: We are TUV aduited supplier with many patent certificates, type test reports, CQC, CE, KEMA, ISO certificates. We can provide on site services for many areas like South America, Indonesia, etc.

 

Certificates

 

Business Partners