It is a single-phase oil-immersed transformer installed on a utility pole to convert medium-voltage electricity into low voltage for residential, agricultural and small commercial loads.
A conventional transformer normally uses externally installed fuse cutouts, surge arresters and secondary protection. A CSP transformer usually integrates some of these protective devices into the transformer.
3. What primary voltages are available?
Primary voltages from 2.4kV to 34.5kV are available. Common ratings include 7.2kV, 7.62kV, 7.97kV, 12.47kV, 13.2kV, 13.8kV, 14.4kV and 24.94kV.
4. What secondary voltages are available?
Common secondary voltages include:
5. What is the output current at 120/240V?
At the full 240V winding, the approximate rated current is 208.3A. For a centre-tapped system, load balancing between the two 120V sections must be considered.
6. Are copper and aluminum windings available?
Yes. Both copper and aluminum windings are available. Selection depends on the utility specification, efficiency requirement, transformer weight and project budget.
7. Is it available in 50Hz and 60Hz versions?
Yes. The transformer can be designed for either 50Hz or 60Hz. The required frequency must be confirmed before production.
8. What cooling method is used?
The standard cooling method is ONAN—Oil Natural Air Natural. It uses natural oil circulation and surrounding air without fans or pumps.
9. What insulating fluids are available?
Standard mineral transformer oil and natural ester fluid are available. Natural ester fluid may be selected for improved fire safety and environmental performance.
10. Is a single-bushing primary configuration available?
Yes. Both single-bushing and dual-bushing primary configurations can be supplied according to the utility grounding system.
The conventional type normally does not include integrated protection. External fuse cutouts and surge arresters can be supplied separately or with mounting provisions.
12. Can taps be provided for voltage adjustment?
Yes. An off-circuit tap changer with a typical range of ±2 × 2.5% can be provided. Other tapping ranges are available when specified.
13. Can it be installed in coastal environments?
Yes. Coastal configurations can include enhanced paint systems, stainless-steel hardware, improved sealing and corrosion-resistant terminals.
14. Can it operate above 1,000 metres?
Yes. High-altitude designs are available. Insulation clearances and thermal performance must be adjusted according to the installation altitude.
15. What standards are available?
The transformer can be manufactured according to IEEE C57, ANSI, CSA, IEC 60076 or a customer-specified utility standard.
Routine tests include:
17. Can customers witness the factory testing?
Yes. Customer-witnessed FAT or independent third-party inspection can be arranged before shipment.
The transformer is secured vertically on a reinforced pallet with protected bushings, sealed terminals and moisture-resistant wrapping. A wooden export case is available when required.
19. What maintenance is required?
Routine maintenance normally includes checking the tank for leakage, inspecting bushings and terminals, verifying grounding, examining external protection devices and monitoring the transformer’s loading condition.
Please provide:
Rated capacity
System and primary voltage
Secondary voltage
Frequency
Winding material
Single- or dual-bushing design
Required BIL
Tap range
Insulating-fluid type
Applicable utility standard
Required accessories
Quantity
Destination country
21. What is the expected service life?
With correct loading, installation and maintenance, the transformer is generally designed for approximately 25–30 years of service.
