On-Load Tap-Changing Dry-Type Transformer

Features:
✅ Integrated vacuum on‑load tap‑changer, voltage regulation under full‑load condition
✅Epoxy resin vacuum cast winding, excellent insulation & mechanical strength
✅High‑grade grain‑oriented silicon‑steel core, low loss, low noise, low partial discharge
✅Wide voltage adjustment range, fast response for stable output voltage
✅ Copper winding as standard, aluminum winding optional
✅ Integrated unit design, simplified site installation
✅ Intelligent temperature monitoring, forced‑air cooling system
✅ Fire‑resistant, explosion‑safe, oil‑free & maintenance‑friendly
✅Customizable voltage class, capacity & control cabinet
✅ Stainless steel hardware & enclosure optional
✅Rated voltage:10kV‑35kV; Capacity:800kVA‑25MVA; IEC compliant

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Main Overview：

SCZ series on‑load tap‑changing dry‑type transformer adopts epoxy resin vacuum cast insulation, integrated with high‑performance vacuum on‑load tap‑changer. It realizes continuous voltage regulation without power cut under load.

Rated voltage covers 10kV‑35kV, capacity ranges from 800kVA up to 25MVA. It features wide regulation range and fast response speed. This transformer is specially developed for occasions demanding high‑stability power supply, such as new‑energy grid‑connection points, urban substations and heavy‑duty industrial sites. The all‑in‑one layout of transformer body and tap‑changer cabinet reduces field‑assembly workload and shortens construction period. Oil‑free dry‑type structure brings outstanding fire‑safety performance for indoor substation deployment.

Meaning of Model Number：

Meaning of Model Number	S	C	Z	□	-	□	/	□
	Three-phase	Epoxy resin cast type	On-load regulated voltage	Performance level code		Rated capacity kVA		Voltage class kV

Product features:

1. Live Voltage Regulation and Uninterrupted Power Supply
Equipped with a reliable vacuum live tap changer. It enables rapid tap switching while the system is energized, maintaining a stable output voltage in response to grid voltage fluctuations, making it ideal for new energy grid-connection applications.
2. High-Quality Epoxy Resin Vacuum-Cast Windings
Utilizes an advanced epoxy resin vacuum-casting process. Features excellent partial discharge performance, high mechanical strength, and resistance to cracking, dust, and moisture, making it suitable for complex indoor operating environments.
3. Optimized Insulation and Cooling Design
A rational longitudinal insulation structure ensures exceptional dielectric performance. An optimized forced air-cooling system effectively controls winding temperature rise and extends service life.
4. Integrated, Compact Layout
The transformer body and on-load tap changer control cabinet are pre-integrated at the factory. This simplifies on-site installation and wiring, shortening the project construction cycle.
5. Comprehensive Intelligent Monitoring and Protection
Features a multi-channel winding temperature detection system, automatic fan control, over-temperature alarms, and trip functions. Remote signal interfaces are provided for easy connection to SCADA systems.
6. High Safety and Low Maintenance
The oil-free, dry-type design eliminates fire hazards and the risk of oil leaks. It features fire- and explosion-proof characteristics, making it suitable for indoor substations. Copper windings are standard; aluminum windings are also available for cost-optimized projects.

Main performance parameters of SCZ11 on-load tap-changing dry-type transformer：

Model	Rated capacity （kVA）	Vector group	Voltage combination（kV）			No-load loss （W）	Load loss（W）120℃ （F）	No-load current （%）	Impedance voltage （%）
Model	Rated capacity （kVA）	Vector group	High voltage	Tapping range	Low voltage	No-load loss （W）	Load loss（W）120℃ （F）	No-load current （%）	Impedance voltage （%）
SCZ11-2000	2000	Dyn11 Yyn0	35 36 37 38.5	±4x2.5%	6 6.3 10 10.5 11	4050	19000	0.65	7
SCZ11-2500	2500					4690	22600	0.65	7
SCZ11-3150	3150					5670	25400	0.6	8
SCZ11-4000	4000					6640	30400	0.6
SCZ11-5000	5000					7850	36100	0.5
SCZ11-6300	6300					9270	41800	0.5
SCZ11-8000	8000					10600	47500	0.45	9
SCZ11-10000	10000					12100	57100	0.45
SCZ11-12500	12500					14700	66500	0.35
SCZ11-16000	16000					18100	78200	0.35
SCZ11-20000	20000					21400	88000	0.3	10
SCZ11-25000	25000					25200	104000	0.3	10

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