SZ11 Series 10 kV and 35 kV Three-Phase On-Load Tap-Changing Transformers

The SZ11 series on‑load tap‑changing power transformers are designed using advanced CAD software, featuring a sophisticated structure and carefully selected components. Their key performance indicators comply with the national standards GB 1094‑2013 “Power Transformers” and GB/T 6451‑2015 “Technical Parameters and Requirements for Three‑Phase Oil‑Immersed Power Transformers,” placing them at the forefront of domestic technology. These transformers are widely applicable to urban and rural industrial and agricultural power grids and play a significant role in energy conservation and environmental protection. The core laminations adopt a stepped stacking configuration, which departs from conventional lamination techniques, optimizing the magnetic flux distribution within the core. As a result, no‑load losses, no‑load current, and noise levels are reduced by 20%, 10%, and 10%, respectively, compared with transformers employing traditional lamination methods.

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Oil-Immersed Power Transformer Series

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Product Description

　　Overview

　　The SZ11 series on‑load tap‑changing power transformers are designed using advanced CAD software, featuring a sophisticated structure and carefully selected components. Their key performance indicators comply with the GB 1094‑2013 standard “Power Transformers” and the GB/T 6451‑2015 standard “Technical Parameters and Requirements for Three‑Phase Oil‑Immersed Power Transformers,” placing them at the forefront of domestic technology. These transformers are widely applicable to urban and rural industrial and agricultural power grids and play a significant role in energy conservation and environmental protection. The core laminations adopt a stepped stacking configuration, which departs from conventional lamination techniques, optimizing the magnetic flux distribution within the core. As a result, no‑load losses, no‑load current, and noise levels are reduced by 20%, 10%, and 10%, respectively, compared with transformers employing traditional lamination methods.

　　Ordering Instructions

　　When placing your order, please provide the following parameters:

　　1. Product Model

　　2. Rated Capacity

　　3. Voltage Combination

　　4. Scope of Adjustment

　　5. Frequency

　　6. Connection Group Designation

　　7. Short-circuit impedance

　　8. For products with special requirements, specify the technical specifications.

　　Technical Performance Parameters

　　Technical Performance Parameters Table for SZ11 Series 10 kV Three-Phase On-Load Tap-Changing Distribution Transformers

Rated Capacity (kVA)	Rated Voltage (kV)			Connection Group	No-load Electric current (%)	Loss (W)		Impedance Voltage (%)	Reference external dimensions (mm)			Reference weight (kg)			Track gauge Horizontal × Vertical (mm)
Rated Capacity (kVA)	High pressure	Tap	Low pressure	Connection Group	No-load Electric current (%)	No-load	Load	Impedance Voltage (%)	long	Wide	High	Body of the vessel	Heavy oil	Total weight	Track gauge Horizontal × Vertical (mm)
200	6 6.3 10 10.5 11	±4 ×2.5%	0.4	Yyn0 Dyn11	1.0	380	2900	4.0	1600	980	1550	605	280	1280	550×550
250					0.9	440	3420		1780	995	1590	670	320	1330	550×550
315					0.9	530	4100		1935	1220	1725	845	435	1715	660×660
400					0.8	640	4950		2025	1350	1850	1010	480	1980	660×660
500					0.8	760	5890		2080	1410	1920	1300	530	2350	660×660
630					0.6	960	7260	4.5	2110	1460	1980	1525	715	2950	820×820
800					0.6	1120	8890		2270	1530	2270	1595	800	3405	820×820
1000					0.6	1360	10400		2360	1675	2440	1730	895	3402	820×820
1250					0.5	1560	12300		2605	1720	2770	2650	980	4610	820×820
1600					0.5	1920	14700		2610	1850	2810	3105	1210	5350	1070×1070
2000					0.4	2270	18600	5.0	2780	2475	2815	3520	1780	6800	1070×1070
2500					0.4	2680	21600	5.0	2820	2505	2635	3985	2025	8040	1070×1070

　　Technical Performance Parameters Table for SZ11 Series 35 kV Three-Phase On-Load Tap-Changing Distribution Transformers

Rated Capacity (kVA)	Rated voltage (kV)			Connection Group	No-load Electric current (%)	Loss (W)		Impedance Voltage (%)	Reference external dimensions (mm)			Reference weight (kg)			Track gauge Horizontal × Vertical (mm)
Rated Capacity (kVA)	High pressure	Tap	Low pressure	Connection Group	No-load Electric current (%)	No-load	Load	Impedance Voltage (%)	long	Wide	High	Body of the vessel	Heavy oil	Total weight	Track gauge Horizontal × Vertical (mm)
2000	3538.5	±3 ×2.5%	6.3 10 10.5	Yd11 YNd11	0.8	2300	19230	6.5	3105	2195	2805	2775	1560	5965	1070×1070
2500					0.8	2550	20640	6.5	3105	2535	2980	3300	1750	6950	1070×1070
3150					0.72	3030	24710	7.0	3220	2725	2840	3770	1970	7900	1070×1070
4000					0.72	3630	29155		3310	2915	3070	4520	2260	9110	1070×1070
5000					0.68	4350	34200		3480	3020	3145	5480	2475	10855	1070×1070
6300					0.68	5280	36765	7.5	3590	2905	3210	6810	2620	12300	1475×1475
8000					0.60	7380	40610		4070	3050	3595	8066	3330	15300	1475×1475
10000					0.60	8700	48050		4105	2795	3655	9705	3750	17858	1475×1475
12500					0.56	10260	56850	8.0	4570	3010	3840	10963	4125	20042	1475×1475
16000					0.54	11400	70320		5235	3295	4615	13140	4900	23740	1475×1475
20000					0.54	13500	82780		5360	3415	4660	15653	5700	28186	1475×1475