Power Transformer 35KV SZ11 Type On-Load Tap-Changing Power Transformer

35KV SZ11 Type On-Load Tap-Changing Power Transformer

Rated voltage	34.5/35/38kv
Rated capacity	1MVA-31.5MVA
Application scenarios	Urban and rural power distribution substations Industrial power supply systems Mining and metallurgical plants Wind and solar power stations Petrochemical and manufacturing facilities
Certifications & Standards	IEC 60076 GB 1094 ANSI / IEEE ISO 9001 CE

Product Overview

The 35KV SZ11 Type On-Load Tap-Changing Power Transformer is a high-efficiency oil-immersed power transformer designed for medium-voltage transmission and distribution systems. It features an advanced on-load tap changer (OLTC) that enables voltage regulation under load without interrupting power supply, ensuring stable grid operation and high power quality.

SZ11 transformers adopt low-loss core materials, optimized winding structure, and enhanced insulation systems, making them ideal for utility substations, industrial plants, renewable energy grids, and urban distribution networks.

Key Features

On-Load Tap-Changing Technology

Voltage adjustment without power interruption
Improves system voltage stability
Suitable for fluctuating load conditions

Energy-Saving Design

Low no-load loss and load loss
Meets national and international energy efficiency standards
Reduces long-term operating costs

Reliable Insulation System

High-quality oil-paper insulation
Strong thermal and dielectric performance
Long service life under continuous operation

Robust Mechanical Structure

Short-circuit resistance
Anti-vibration core clamping design
Suitable for harsh operating environments

Factory Testing

Each SZ11 transformer undergoes strict inspection and testing:

Winding resistance test
Voltage ratio and vector group test
No-load loss and current test
Load loss and impedance test
Partial discharge test
Oil dielectric strength test

35KV SZ11 Series On-Load-Tap-Changing Power Transformer(ONAN)

Type	RatedCapachy (kVA)	Voltage comblnation					Connection symbol	NO-boad Loss (kW)	load Loss (KW)		NO-load Current (%)		Short-circuit Impedance (%)
		HV	Taping Range ofHN		LV
SZ11-1000/35	1000	35	±3×2.5%		0.4		Yyno	1.34	11.4		1		6.5
SZ11-1250/35	1250							1.57	13.4		1
SZ11-1600/35	1600							1.91	16.1		0.9
SZ11-2000/35	2000							2.24	19.1		0.9
SZ11-1600/35	1600	35	±3×2.5% ±4×2.5%		6.3 10.5		Ydll	1.91	16.2		0.9
SZ11-2000/35	2000							2.3	19.1		0.9
SZ11-2500/35	2500							2.72	20.5		0.7
SZ11-3150/35	3150	35 38.5						3.23	24.6		0.7		7
SZ11-4000/35	4000							3.87	29		0.6
SZ11-5000/35	5000							4.64	34		0.6
SZ11-6300/35	6300							5.63	36.6		0.4		7.5
SZ11-8000/35	8000				6 6.3 10.5 11		Yndll	7.87	40.4		0.4
SZ11-10000/35	10000							9.28	47.8		0.4
SZ11-12500/35	12500							10.94	56.5		0.3		8
SZ11-16000/35	16000							13.17	69		0.3
SZ11-20000/35	20000							15.57	83.2		0.2
SZ11-25000/35	25000							18.6	98.2		0.2
SZ11-31500/35	31500							21.9	116.6		0.2

Type	RaedCapachy (KVA)	(kg)Waight				(mm)Overall Dimension						(mm) Track Spacing
		OiL		Total		(L)		(W)		(H)
SZ11-1000/35	1000	1510		4825		2855		1600		2580		820×820
SZ11-1250/35	1250	1575		5450		2890		1750		2605		1070×1070
SZ11-1600/35	1600	1650		6250		2935		1900		2620		1070×1070
SZ11-2000/35	2000	1770		7000		3050		2100		2645		1070×1070
SZ11-1600/35	1600	1665		6350		2890		1950		2700		1070×1070
SZ11-2000/35	2000	1775		7000		3050		2000		2800		1070×1070
SZ11-2500/35	2500	2100		8000		3200		2100		2850		1070×1070
SZ11-3150/35	3150	2450		9425		3500		2960		2850		1070×1275
SZ11-4000/35	4000	2650		10650		3600		3010		2965		1070×1275
SZ11-5000/35	5000	2900		12250		3700		3200		3070		1070×1275
SZ11-6300/35	6300	3490		14350		3900		3380		3215		1070×1275
SZ11-8000/35	8000	4530		18150		4240		3490		3295		1070×1475
SZ11-10000/35	10000	5050		20400		4435		3460		3400		1070×1475
SZ11-12500/35	12500	6000		23850		4565		3700		3850		1070×1475
SZ11-16000/35	16000	6640		27800		4815		4300		3950		1070×1475
SZ11-20000/35	20000	8050		32800		5200		4425		4100		1070×1475
SZ11-25000/35	25000	8500		39500		5080		4550		4150		1475×1475
SZ11-31500/35	31500	9485		43500		5190		4700		4300		1475×1475

35kV S11 Series Off-Circuit-Tap-Changing Distribution Transformer

Type	Rated Capacky (kVA)	Votage combination				Connection symbol	NO-oad Loss (kW)	load Loss (kW)		NO-load Current (%)		Short-circuit Impedance (%)
		HV	Tapping Range ofHV		(KV) LV
S11-50/35	50	35 38.5	±5%		0.4	Yyno Dyn11	0.17	1.15/1.21		2		6.5
S11-100/35	100						0.23	1.92/2.01		1.9
S11-125/35	125						0.27	2.26/2.38		1.8
S11-160/35	160						0.29	2.68/2.82		1.7
S11-200/35	200						0.34	3.15/3.33		1.6
S11-250/35	250						0.41	3.74/3.95		1.5
S11-315/35	315						0.49	4.51/4.76		1.4
S11-400/35	400						0.58	5.44/5.75		1.13
S11-500/35	500						0.69	6.55/6.92		1.2
S11-630/35	630						0.83	7.82		1.1
S11-800/35	800						0.98	9.35		0.9
S11-1000/35	1000						1.15	11.5		0.8
S11-1250/35	1250						1.41	13.9		0.7
S11-1600/35	1600						1.7	16.6		0.6

Type	Ratsd Capachy (kVA)	(kg〕Waight			(mm)Overall Dimension						( mm) Track Spacing
		OiL		Total	(L)		(W)		(H)
S11-50/35	50	280		775	1150		900		1800		550×550
S11-100/35	100	390		1150	1210		950		1880		660×660
S11-125/35	125	425		1225	1320		1120		1960		660×660
S11-160/35	160	475		1395	1400		1140		1980		660×660
S11-200/35	200	510		1510	1420		1160		2000		660×660
S11-250/35	250	555		1670	1480		1200		2050		660×660
S11-315/35	315	585		1980	1730		1180		2100		660×660
S11-400/35	400	630		2200	2100		1155		2300		660×660
S11-500/35	500	710		2495	2100		1220		2170		820×820
S11-630/35	630	800		3450	2150		1250		2250		820×820
S11-800/35	800	930		3900	2300		1310		2350		820×820
S11-1000/35	1000	1050		4550	2480		1360		2450		820×820
S11-1250/35	1250	1200		4900	2500		1420		2585		820×820
S11-1600/35	1600	1265		5500	2650		1750		2605		1070×1070