220kV Oil-Immersed 3-Phase 2-Winding OLTC Power Transformer

220kV Oil-Immersed 3-Phase OLTC Power Transformer. Designed for critical grid nodes requiring precise voltage control.
Features on-load tap-changer (OLTC), rated 31.5 to 240 MVA, HV 220/230kV, LV 6.3-69kV, YNd11 vector group, and low no-load current (down to 0.24%) for stable, efficient operation.

Products Description

This transformer series is a high-end two-winding main power transformer designed for critical 220kV grid nodes. It integrates proven transformer technology with online on-load tap-changing (OLTC) capability, ensuring precise voltage regulation without power interruption.

It is specifically engineered for critical load areas sensitive to voltage fluctuations, such as urban core substations, data centers, and high-end manufacturing facilities, providing a highly stable and reliable power supply.

Technical Specifications

Rated capacity (kVA)		Rated voltage and tapping range			Vector group	No Load Current (%)	Short-circuit impedance (%)	No load Losses (kW)	On load Losses (kW)
		HV (KV)	Tapping range	LV (KV)
31500		220 230	±4×1.25 ±6×1.25 ±8×1.25	6.3 6.6 10.5 21	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						0.3		59	413
120000	LV 66kV 69kV			66 69		0.36		45	303
150000						0.33		53	355
180000						0.3		62	406
240000						0.24		77	504

Core Advantages

Precise Voltage Regulation: Equipped with an On-Load Tap-Changer (OLTC) offering multiple tap ranges (±4×1.25%, ±6×1.25%, ±8×1.25%), enabling real-time voltage adjustment without interrupting power supply.
Flexible Voltage Scenarios: HV side compatible with standard 220kV and 230kV grids. LV side offers flexible options from 6.3kV to 21kV, with 66kV and 69kV available for direct medium-voltage supply to regional grids.
High Operational Economy: Rated from 31.5 MVA to 240 MVA. Utilizes standard YNd11 vector group for system compatibility, with short-circuit impedance (12%~14%) designed to limit short-circuit currents while ensuring stability.
Lower Operating Costs: Low no-load current (minimum 0.24%) and well-controlled loss values significantly reduce long-term operational energy consumption.

Typical Applications

220kV urban core substations and dedicated substations for important users requiring strict power quality and voltage stability.
Regional grid interconnection substations serving voltage regulation and support functions.
Power supply hubs for sensitive loads such as large data centers, high-end manufacturing, and precision industries.
Key nodes in large industrial parks requiring direct medium-voltage (66/69kV) supply.

Hot Tags: 220kv oil-immersed 3-phase 2-winding oltc power transformer, China 220kv oil-immersed 3-phase 2-winding oltc power transformer manufacturers, suppliers, factory, 220kV Oil Immersed 3 Phase 2 Winding NLTC Power Transformer, 220kV Oil Immersed 3 Phase 3 Winding OLTC Power Transformer, 220kv power transformer, 220kV Oil Immersed 3 Phase 2 Winding OLTC Power Transformer, 220kV Oil Immersed 3 Phase 3 Winding NLTC Power Transformer