220 kV Three-Phase OLTC Power Transformer

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220kV Oil-immersed Three-phase Double-winding On-load Voltage Regulating Power Transformer

220kV Oil-immersed Three-phase Double-winding On-load Voltage Regulating Power Transformer

The 220kV oil-immersed three-phase double-winding on-load voltage regulating power transformer is designed for efficient voltage control and stable power transmission in high-voltage grids. It features low losses, strong short-circuit resistance, reliable on-load tap changing, and excellent thermal performance. Suitable for substations and industrial power systems, ensuring continuous, safe, and flexible voltage regulation under varying load conditions.

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Product Introduction

Product Features

The 220kV oil-immersed three-phase double-winding on-load voltage regulating power transformer is designed for high-efficiency voltage regulation and stable operation in modern power transmission systems. It adopts a high-quality grain-oriented silicon steel core and advanced oil-immersed cooling structure to reduce losses, enhance heat dissipation, and improve overall energy efficiency. The integrated on-load tap changer enables continuous voltage adjustment without interrupting system operation, ensuring flexible and reliable grid performance under varying load conditions.

With a robust insulation system and optimized winding design, the transformer delivers excellent short-circuit withstand capability, low partial discharge, and strong mechanical strength. It is suitable for substations, industrial power distribution, and regional grid interconnection projects where stable and precise voltage control is required. Designed for long service life and low maintenance, it ensures safe, efficient, and dependable operation in demanding environments, meeting international standards and customizable engineering requirements.

Technical Specifications

220kV oil-immersed three-phase double-winding on-load voltage regulating power transformer.

Rated capacity(kVA)	Rated voltage and tapping range			Vector group	No load current (%)	Short-circuit impedance (%)	No load losses (kW)	On load losses (kW)
Rated capacity(kVA)	HV	Tapping range (%)	LV	Vector group	No load current (%)	Short-circuit impedance (%)	No load losses (kW)	On load losses (kW)
31500	220 / 230	±4×1.25 ±6×1.25 ±8×1.25	6.3 6.6 10.5 21 36 37 38.5	YNd11	0.46	12-14	17	115
40000					0.46		20	134
50000					0.42		24	161
63000					0.42		28	188
90000			10.5 21 36 37 38.5		0.36		35	246
120000					0.36		43	304
150000					0.33		51	360
180000					0.30		59	413
120000			66 69		0.36		45	303
150000					0.33		53	355
180000					0.30		62	406
240000					0.24		77	504

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Packing and Delivery

Product Design and Manufacturing Quality

Yawei Transformer applies strict quality control throughout the entire manufacturing process, including:

Core cutting and assembly
Winding production
Vacuum oil filling
Insulation system testing
Temperature rise testing
Partial discharge testing
Factory acceptance testing (FAT)

Installation and Maintenance

1.Daily/Weekly Inspections
Visual check for oil leaks at gaskets, valves and welds. Verify oil & winding temperatures stay within normal limits. Listen for abnormal hum or buzz signalling loose core laminations or overload.
2.Monthly/Quarterly Checks
Check silica‑gel breather; regenerate/replace gel if pink (saturated). Confirm conservator oil level, top‑up with matching‑grade oil as needed. Clean bushings to avoid flashovers from dirt contamination.
3.Annual Maintenance
Run DGA test on insulating oil for early internal fault detection (arcing, overheating). Verify protective relays and alarm circuits work properly. Retighten external electrical connections; check tank paint and anti‑corrosion condition.
4.Long‑term Overhaul
Carry out major overhaul every 10‑15 years subject to service conditions and oil analysis. Works include oil draining, inspection of inner core and coil clamping parts, gasket replacement, and insulating‑oil reconditioning or full renewal.

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