Distribution Transformers

SZ11/13/20/22-M Series 35kv Three-Phase Oil-Immersed Transformer

Product Overview

The 35kV Series power transformers incorporate advanced design principles with substantial improvements in materials, structural engineering, and manufacturing processes. The high/low-voltage clamping frames utilize steel straps combined with top and side beams to form a rigid frame structure, significantly enhancing core compression force and transportation impact resistance. These units deliver:
• Enhanced short-circuit withstand capacity
• Superior operational reliability with reduced losses
• Noise levels below industry standards
• Aesthetic industrial design
Performance benchmarks align with leading international equivalents in this class.

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Product Features

Safe, Fireproof & Pollution-Free: Direct operation at load centers.
High Mechanical Strength: Withstands short-circuits, minimizes partial discharges, ensures thermal stability, and extends service life.
Efficient Cooling: Capable of overload operation with forced air cooling.
Robust Surface Treatment: Degreased, derusted, sandblasted, and painted for superior moisture resistance, ideal for metallurgy, petrochemical, and humid/polluted environments.
Eco-Friendly: Flame-retardant, explosion-proof, and maintenance-free.
Compact & Lightweight: Easy transportation and installation.
Secure Positioning: Fixed core-tank structure prevents displacement during transit and ensures long-term operational stability.
High-Efficiency Core: Uses premium low-loss silicon steel laminations with multi-step mitered joints to reduce no-load losses and noise. Coils utilize paper-wrapped or self-adhesive transposed conductors to minimize load losses, lowering grid and user operating costs.

Performance & Dimensions

Technical Specifications

Type	Rated capacity (kVA)	HV (kV)	Tapping range (%)	LV (kV)	Vector group	No-load loss 11#(W)	No-load loss 13#(W)	No-load loss 20#(W)	No-load loss 22#(W)	Load loss 11#(W)	Load loss 13#(W)	Load loss 20#(W)	Load loss 22#(W)	Impedance voltage (%)
Off-load tap-changing	3150	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	3040	2400	2000	1700	23000	21900	20700	20700	7
Off-load tap-changing	4000	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	3610	2900	2300	2000	27300	25900	24600	24600	7
Off-load tap-changing	5000	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	4320	3500	2800	2400	31300	29700	28200	28200	7
Off-load tap-changing	6300	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	5240	4200	3400	2900	35000	33300	31500	31500	7
Off-load tap-changing	8000	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	7200	5800	4700	4000	38400	36500	34600	34600	7
Off-load tap-changing	10000	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	8700	7000	5700	4800	45300	43000	40800	40800	8
Off-load tap-changing	12500	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	10000	8000	6500	5500	53800	51100	48400	48400	8
Off-load tap-changing	16000	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	12100	9700	7900	6700	62500	59200	59200	59200	8
Off-load tap-changing	20000	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	14400	11500	9400	7900	79500	75500	71600	71600	8
Off-load tap-changing	25000	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	17000	13600	11100	9400	94000	89300	84600	84600	8
Off-load tap-changing	31500	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	20200	16200	13100	11100	112000	106400	100800	100800	10
On-load tap-changing	3150	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	3230	2600	2100	1800	24700	23500	22200	22200	7
On-load tap-changing	4000	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	3870	3100	2500	2100	29100	27600	26200	26200	7
On-load tap-changing	5000	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	4640	3700	3000	2600	34200	32500	30800	30800	7
On-load tap-changing	6300	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	5630	4500	3700	3100	36700	34900	33000	33000	7
On-load tap-changing	8000	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	7870	6300	5100	4300	40600	38600	36500	36500	7
On-load tap-changing	10000	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	9280	7400	6000	5100	48000	45600	43200	43200	8
On-load tap-changing	12500	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	10900	8700	7100	6000	56800	54000	51100	51100	8
On-load tap-changing	16000	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	13100	10500	8500	7200	66800	63300	63300	63300	8
On-load tap-changing	20000	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	15500	12400	10100	8500	82700	78600	74400	74400	8
On-load tap-changing	25000	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	18300	14600	11900	9780	97800	92900	88000	88000	8
On-load tap-changing	31500	35,38.5	±5 or ±2×2.5	3.15,6,3,10	Dyn11 or Yd11 or YNd11	21800	17400	14200	12000	116000	110200	104400	104400	10

Applications

It is suitable for important locations with special fireproof requirements, such as commercial buildings, high-rise structures, airports, industrial and mining enterprises, power plants, oil platforms, subways, and tunnels. It can also be combined with switchgear to form prefabricated substations.