Dry-type Transformer

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Product Overview

Dry-type Transformer

High-voltage rated voltage	6kV - 35kV
Low-voltage rated voltage	0.4kV; export versions customizable to 400V, 480V and other voltages
Rated capacity	100kVA - 25000kVA
Power Supply Mode	Three-phase AC power distribution; customized for rectifier and special-purpose applications
Frequency	50Hz; 60Hz customizable for overseas projects
Cooling Type	AN natural-air cooling / AF forced-air cooling

Dry-type Transformer Technical Specifications

Parameter	Value	Parameter	Value
High-voltage rated voltage	6kV – 35kV	Low-voltage rated voltage	0.4kV; export versions customizable to 400V, 480V and other voltages
Rated capacity	100kVA – 25000kVA	Power Supply Mode	Three-phase AC power distribution; customized for rectifier and special-purpose applications
Frequency	50Hz; 60Hz customizable for overseas projects	Cooling Type	AN natural-air cooling / AF forced-air cooling
Product Series	SCB / SGB / SCBH series dry-type transformers	Transformer Type	Epoxy-cast / VPI dry-type transformer; amorphous-alloy option available
Vector Group	Dyn11 / Yyn0 / Ddyn and other configurations customizable	Tap-changer	Off-circuit tap-changer ±2 x 2.5%; on-load tap-changer optional
Insulation Class	F-class / H-class optional	Insulation Level	Compliant with IEC 60076-11 and GB/T 1094.11
Enclosure Protection	IP20 standard; IP23 optional	Ambient Conditions	-25°C ~ +40°C; C2/E2/F1 grades customizable for high-altitude, high-temperature and high-humidity environments
Core Material	High-permeability low-loss grain-oriented silicon steel; amorphous-alloy option for SCBH series	Core Construction	Five-step stepped-lap fully-mitered-joint construction
Winding Technology	Vacuum epoxy resin cast windings; VPI vacuum-pressure-impregnated type optional	Winding Structure	Foil-wound or disc-type structures optional; conductor transposition available
Winding Insulation	Epoxy resin cast insulation or NOMEX insulation system for special applications	Environmental Protection	Moisture-proof, dust-proof and pollution-resistant dry-type construction
Fire Safety	Oil-free construction; C2 climate, E2 environmental and F1 fire-safety classification achievable	Fire Risk	No insulating oil; no oil leakage or oil-related fire risk
Partial Discharge	<= 10pC at 1.5 x rated voltage	Noise Level	Typical <= 62dB(A) at 1m; low-noise version available
Short-Circuit Withstand	Designed and validated per IEC 60076-5; winding dynamic-force safety margin > 1.3 x calculated values	Thermal Performance	Temperature rise compliant with IEC/GB standards; >= 20% thermal margin reserved for harmonic-load applications
Overload Capability	AF forced-air cooling can increase overload capacity by approximately 40% – 50%	Life Expectancy	>= 30 years under normal operating conditions
Temperature Control	Embedded PT100 winding temperature sensors and intelligent temperature controller	Temperature Controller Functions	Fan start/stop; over-temperature alarm; over-temperature trip output
Anti-Corrosion Grade	C3, C4, C5, CX-H	Cooling Configuration	AN natural-air cooling / AF forced-air cooling
Design Method	Electromagnetic-thermal-flow-mechanical multi-physics coupled design	Electromagnetic Simulation	3D finite-element modelling; core-winding loss simulation; harmonic additional-loss calculation; electric-field verification
Mechanical Simulation	ANSYS structural simulation; winding electromagnetic-force verification; active-part and enclosure strength checks	Short-Circuit Simulation	Transient magnetic-field simulation; winding stress and deformation evaluation
Insulation Coordination	HV/LV winding electric-field simulation; lightning-impulse and switching-impulse withstand verification	Thermal-Flow Simulation	CFD airflow simulation; AN/AF airflow-path optimization; hot-spot temperature prediction
Seismic Qualification	IEEE 693 compliance available as an option for high-seismic-zone projects	Environmental Classification	C2 low-temperature / E2 high-humidity and polluted-environment operation; F1 fire classification
Typical Model	SCB14-10/0.4-1600kVA F-class epoxy-cast dry-type transformer	Reference Configuration	Epoxy-cast windings; dual-mode AN/AF cooling; intelligent temperature controller with fans; IP20 enclosure
Reference Primary Voltage	10kV	Reference Secondary Voltage	0.4kV
Reference Vector Group	Dyn11	Reference Insulation Class	F-class
Special Options	Over-temperature alarm and trip output; online partial-discharge monitoring	Optional Accessories	Enclosure; cooling fans; temperature indicator; live-part indicator; earthing switch; online partial-discharge monitoring module
Applicable Standards	IEC 60076-11; IEC 60076-1/2/3/5; GB/T 1094.11-2022; GB/T 10228-2023; GB 20052; GB/T 17211	Export Standards	IEEE C57.12.91 optional; IEEE 693 optional; RoHS and REACH
Energy Efficiency	SCB conventional silicon-steel series; SCBH amorphous-alloy series with greatly reduced no-load losses; Grade-1 energy efficiency	Core Loss Reduction	Amorphous-alloy SCBH series designed to significantly reduce no-load losses
Typical Applications	High-rise buildings; commercial complexes; hospitals; schools; rail transit; metro tunnels; data centers	New Energy Applications	PV and wind-power step-up applications; box-type substations; prefabricated E-houses
Industrial Applications	Industrial and mining plants; metallurgical systems; harmonic-load applications; dry-type rectifier transformers	Special Applications	Rectifier and earthing applications; indoor distribution systems; overseas EPC projects
Factory Acceptance Testing	Routine tests and type tests including partial-discharge and temperature-rise verification	Environmental-Fire Type Tests	C2/E2/F1 environmental and fire classification type tests available upon request
Short-Circuit Test	Excluded from FAT scope; witnessed testing by client or third-party inspectors available	Site Support	Installation guidance; commissioning supervision; post-commissioning performance verification
Warranty	Comprehensive product warranty; extended service agreement optional	Spare Parts Supply	Minimum 25-year spare-parts supply for key components
Technical Training	On-site or remote O&M training covering temperature-controller operation, winding inspection and harmonic-load operation	Quality System	ISO 9001; ISO 14001; ISO 45001
Customization	Silicon-steel / amorphous-alloy options; F/H insulation class; on-load tap-changer; C2/E2/F1 grades; high-altitude and anti-corrosion enclosures	Frequency Options	50Hz domestic version / 60Hz overseas export version
Technical Documentation	Electromagnetic-thermal simulation documents; full type-test reports; component certificates; material traceability documentation	ESG Documentation	LCA life-cycle-assessment documentation available upon request

Protection & Accessories

Reliable Protection System and Flexible Accessories

Our Pad Mounted Transformers are equipped with reliable protection devices and accessories to ensure safe operation in underground distribution systems and utility applications.

Standard Accessories

HV/LV Bushings

Reliable medium voltage connection with excellent insulation performance.

Oil Level Gauge

Easy monitoring of insulating oil level for maintenance.

Pressure Relief Device

Improves transformer safety under abnormal conditions.

Drain Valve

Convenient oil draining and maintenance operation.

Tap Changer

Off-circuit Tap Changer (OCTC), ±2 × 2.5%

Nameplate

Provides complete transformer rating and technical information.

Optional Accessories

Temperature Indicator

Monitors transformer operating temperature for reliability.

Remote Monitoring System

Supports smart grid and remote transformer condition monitoring.

Surge Arrester

Protects pad mounted transformers against lightning and voltage surges.

Key Features of Transformers

Key Benefits:

Enhanced operator and public safety
No exposed high-voltage components
Suitable for underground distribution systems
Reliable operation in outdoor environments

Key Benefits:

Weather-resistant construction
Corrosion-resistant surface treatment
Secure locking compartment
Suitable for public and utility applications

Key Benefits:

Space-saving installation
Low-profile outdoor design
Easy inspection and maintenance
Ideal alternative to overhead distribution systems

Available Configurations:

Loop feed distribution system
Radial feed distribution system
Dead-front cable connection
Customized MV and LV connection arrangements

Available protection and accessories include:

High voltage fuses
Current limiting fuses
Load break switches
Surge arresters
Pressure relief devices
Temperature monitoring systems

These protection solutions help ensure safe operation under different load and fault conditions.

Key Benefits:

Low no-load losses
High energy efficiency
Excellent thermal performance
Long operational lifetime

Manufacturing & Testing

Strict Quality Control and Transformer Testing

Every Pad Mounted Transformer undergoes comprehensive testing to ensure high reliability, safety and long service life according to international standards.

Routine Tests

Transformer Ratio Test

Ensures accurate voltage transformation performance.

Winding Resistance Test

Verifies winding quality and electrical performance.

No-Load Loss Test

Checks transformer core efficiency and energy performance.

No-Load Loss Test

Confirms transformer rated efficiency under operating conditions.

Impedance Test

Ensures correct electrical characteristics and system compatibility.

Dielectric Test

Verifies insulation strength and operational safety.

Special Tests

Temperature Rise Test

Validates thermal performance and cooling capability.

Lightning Impulse Test

Tests insulation capability against surge conditions.

Partial Discharge Test

Ensures insulation quality and long-term reliability.

Everything We Do Is At A High Standard

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WHAT WE DO

CTSS Transformer Applications and Solutions

We design and manufacture liquid-filled power transformers and distribution transformers for a wide range of applications, including solar power, data centers, industrial facilities, and utility systems. With experienced engineers and advanced manufacturing capabilities, we provide customized transformer solutions and complex winding designs to meet the specific electrical and performance requirements of each project.