Three Phase Indoor Dry Type Transformer for Data Center 33kV 630kVA

Model:CB12-630/33 (SCB14 / SSCB18 optional)

Rated Capacity:630 kVA

Phase:Three-phase

Frequency:50 Hz / 60 Hz

High Voltage (HV):33 kV

Low Voltage (LV):0.415 kV (0.4 kV optional)

HV Tapping Range:±2×2.5% off-circuit (±5% optional)

Vector Group:Dyn11 (Yyn0 / Dyn5 optional)

Cooling Method:AN (natural air) / AF (forced air with fans)

Insulation Class:Class F 155°C (Class H 180°C optional)

Temperature Rise:100 K (F) / 125 K (H)

Winding Material:Copper (aluminium optional)

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Product Details
FAQs
Packing & Delivery

Quick Answer

A 630 kVA 33 kV dry-type transformer for a data center is a cast-resin, oil-free, three-phase transformer that steps 33 kV medium voltage down to 400/415 V for UPS and server hall distribution. Data centers specify it because cast resin is self-extinguishing and contains no oil, so no fire suppression bund, oil pit or leakage risk is required indoors. Per IEC 60076-11, partial discharge is limited to 10 pC, and with AN/AF cooling the unit accepts around 40–50% overload during UPS switchover or maintenance.

Product Overview

This is a three-phase indoor dry-type cast resin transformer rated 630 kVA with a primary voltage of 33 kV and a secondary voltage of 415 V (400 V optional). The windings are vacuum-cast in epoxy resin, giving a non-hygroscopic, flame-retardant and maintenance-free insulation system that is safe to install inside the electrical room of a data center, directly at the load centre.

Designed for Tier III / Tier IV data centers, colocation facilities, hyperscale and AI/GPU compute halls, it feeds UPS input, power distribution units and mechanical loads. The unit is manufactured under ISO 9001 and tested in accordance with IEC 60076-11, IEC 60076-1 and EN 50588-1.

Why Data Centers Choose Dry-Type Over Oil-Immersed

Consideration	Cast Resin Dry Type	Oil-Immersed	Data Center Impact
Fire risk	Self-extinguishing, F1 fire behaviour, no oil	Combustible oil, needs bund and suppression	Dry type can sit indoors at the load centre
Installation	Indoor, no oil pit	Outdoor or fire-rated room	Saves fire-rated room and bund cost
Maintenance	Maintenance-free, no oil testing	Periodic oil sampling and filtration	Lower OPEX over 25 years
Humidity	Operates at 100% RH, non-hygroscopic	Moisture ingress risk	Stable during commissioning and outages
Cooling	AN with AF fans for 40–50% overload	ONAN	Matches UPS switchover peaks
Monitoring	PT100 + PTC + thermostat as standard	Optional	Feeds BMS and DCIM directly

Our recommendation: for indoor data center electrical rooms, specify cast resin dry type unless the room is fire-rated and the unit is installed outdoors.

Key Features

Fire-safe and oil-free— epoxy resin cast windings are self-extinguishing and halogen-free, suitable for installation at the load centre without a fire-rated transformer room.
Low partial discharge— vacuum casting under controlled conditions keeps partial discharge at or below 10 pC (IEC 60076-11), protecting insulation over a 25-year service life.
Low loss design— high-permeability grain-oriented silicon steel with step-lap core reduces no-load loss and meets EN 50588-1 / EU Ecodesign 2019/1783 Tier 2 requirements.
AN / AF cooling— natural air cooling at rated load, forced-air fans raise capacity by approximately 40–50% for UPS switchover and N+1 contingency.
Thermal monitoring as standard— PT100 sensors in each winding phase plus PTC thermistors, with alarm and trip contacts for BMS and DCIM integration.
Harmonic-capable design— K-factor or K-13 rated design available for UPS, rectifier and GPU server loads with high harmonic content.
Electrostatic shield option— earthed screen between HV and LV windings attenuates common-mode noise, protecting sensitive IT equipment.
Low noise— typically below 58 dB(A) at 1 m, suitable for electrical rooms adjacent to occupied areas.
Moisture and dust resistant— fully encapsulated windings allow operation in 100% relative humidity and coastal or dusty environments.

Typical Applications

Hyperscale and AI / GPU compute data centers
Colocation facilities and Tier III / Tier IV server halls
Edge data centers and modular containerised IT halls
UPS input and output distribution
Financial trading and telecom core sites
Network operations centres and server rooms in commercial buildings

Standards and Certifications

Designed and type-tested in accordance with IEC 60076-11 (dry-type power transformers), IEC 60076-1 (general requirements) and EN 50588-1. Energy performance meets EU Ecodesign Regulation 2019/1783 Tier 2 (EN 50588-1) . Manufactured under ISO 9001, ISO 14001 and ISO 45001. CE available; KEMA or equivalent third-party type test reports available on request.

FAQ:

1.What is the delivery time

Normally in 30 days,if large order more than 100 piece,production time 40 days

2.What is your advantage

Fast delivery,Strict quality control,provide OEM,ODM service of the distribution transformer

3. what is your payment terms

We accept T/’T,L/C at sight,At least 30% deposit when signed contract,70% balance before shipment

4.what is the warranty time

warranty time 2 years

5.Which company is the top 10 best transformer factory in CHINA

Frankly speaking,Shendian electric is not top 10 transformers in CHINA,But we permit to provide top 10 service in Transformer field

6.Why choose shendian

Our mission is to be top brand transformers in global market.We focused on product quality as our life.

Q1: What is a dry-type transformer for a data center?

A: A dry-type transformer for a data center is an air-cooled, cast resin insulated transformer that steps medium voltage (typically 11 kV, 22 kV or 33 kV) down to 400/415 V without using any insulating oil. Because it contains no oil, it is fire-safe and can be installed indoors at the load centre, which is why it is the default choice for server halls and UPS rooms.

Q2: Why do data centers use dry-type instead of oil-immersed transformers?

A: Data centers use dry-type transformers because epoxy cast resin is self-extinguishing and oil-free, removing the need for fire-rated rooms, oil bunds and suppression systems. Dry-type units are also maintenance-free (no oil sampling), tolerate 100% humidity and can be placed next to the load, cutting cable losses and installation cost.

Q3: Is a 630 kVA 33 kV dry-type transformer suitable for a Tier III or Tier IV data center?

A: Yes. A 630 kVA 33 kV cast resin transformer is commonly used in 2N or N+1 configurations, where each unit feeds one UPS or distribution path. For Tier III/IV projects, specify AN/AF cooling, PT100 thermal monitoring with alarm and trip contacts, and a K-factor design if the load is dominated by UPS rectifiers and GPU servers.

Q4: Can this transformer handle UPS and harmonic loads?

A: Yes. Non-linear loads from UPS rectifiers and switched-mode power supplies cause harmonic heating, so a K-factor (typically K-13) rated design with an electrostatic shield between windings can be supplied. For dry-type transformers, IEC 60076-11 and IEEE C57.110 provide the loading guidance for harmonic-rich duty.

Q5: What cooling does it use and what is the overload capacity?

A: The transformer runs on AN (natural air) cooling at rated load, and AF (forced air) fans increase available capacity by approximately 40–50%. This covers UPS switchover, battery recharge and N+1 contingency periods without exceeding the Class F or Class H temperature rise limit.

Q6: Is 400 V or 415 V available on the low-voltage side?

A: Both. The standard secondary is 415 V for 50 Hz markets (Europe, Middle East, Africa, Asia-Pacific) and 480 V or 400 V can be supplied for 60 Hz or project-specific requirements. Voltage ratio, tapping range and vector group are all configurable.

Q7: What partial discharge level is required for a 33 kV cast resin transformer?

A: IEC 60076-11 limits partial discharge for dry-type transformers to 10 pC. Well-controlled vacuum casting typically achieves 5 pC or lower, which is the level most data center specifications ask for on 33 kV class equipment.

Q8: Can the transformer temperature be monitored by the BMS or DCIM system?

A: Yes. Standard supply includes PT100 sensors in each winding phase and PTC thermistors connected to a temperature controller with alarm and trip contacts. An optional Modbus RTU/TCP or BACnet gateway feeds winding temperature directly into the BMS or DCIM platform.

Q9: What is the typical delivery time and packing?

A: Production is typically 4–8 weeks depending on specification and order quantity. The transformer is packed in an export-standard plywood crate on a steel base frame, with moisture barrier, desiccant and shock indicators, suitable for sea, air and road transport.

Export-standard plywood crate fixed on a steel base frame, wrapped with moisture barrier film and desiccant, with lifting lugs and shock/tilt indicators. Suitable for sea, air and land transportation. Final gross weight, crate dimensions and packing list will be confirmed before shipment.

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