How do I change the tap position?

The tap changer is an off-circuit type and must only be adjusted with the transformer fully de-energized. Rotate the handle on the HV side to the required tap, verify continuity, then restore power.

Can the transformer carry loads beyond its rated capacity?

Yes, within limits. The standard configuration uses AN (Air Natural) cooling. Adding optional AF (Air Forced) cooling fans raises usable capacity by roughly 40–50%.

What's the difference between AN and AF cooling?

Mode How it works Capacity gain Best suited to AN (standard) Natural convection, no fans Base rating Normal continuous duty AF (optional) Forced air via cooling fans +40–50% Peak demand / overload periods

Which insulation class should I choose?

Class F (155°C) is the standard. Where ambient temperatures are higher or overloads are frequent, specify Class H (180°C).

Does the unit need routine maintenance?

No. It is designed as maintenance-free — no oil to sample or replace, and it combines flame retardancy with zero leakage.

Where is it typically installed?

High-rise buildings, airports, railway stations, docks, metro systems, hospitals, and densely populated residential areas, as well as power plants, petrochemical facilities, and nuclear power stations.

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SCB18 (NXl) series High-Efficiency Silicon dry-type power transformer

Name: SCB18 (NXl) series High-Efficiency Silicon dry-type power transformer
Brand: Zhejiang Tenrony Electricity Co., Ltd.
Availability: InStock

Built around high-grade low-loss silicon steel laminations, the SCB18 delivers industry-leading no-load loss. The coils are produced through multi-stage vacuum degassing casting, ensuring tight winding structure and ultra-low partial discharge.

Compliant with top-tier IEC energy efficiency and safety standards, the transformer delivers fully upgraded performance in shock resistance, noise reduction, heat dissipation, and anti-aging, with flame retardancy, zero leakage, and maintenance-free operation. It offers superior overload and short-circuit withstand capability, making it the preferred choice for zero-carbon demonstration projects, precision manufacturing facilities, and high-end benchmark power installations.

Products

Features

Core R&D Foundation

Built on a thin-insulation, cast (encapsulated) dry-type transformer design with advanced technical performance.

Outstanding Operating Characteristics

Maintenance-free design — No routine servicing required, resulting in low operating cost.

Strong adaptability to harsh environments — Moisture-resistant and heat-resistant construction ensures stable operation in humid, high-temperature, and other complex conditions.

Fire-resistant and explosion-proof — Delivers a high safety margin for critical applications.

Low Losses and Low Noise

Optimized design achieves low partial discharge and reduced power losses.

Low acoustic noise level, suitable for noise-sensitive applications.

Efficient Cooling and High Overload Capacity

Excellent thermal dissipation; under forced-air cooling (AF) conditions, the unit can sustain higher loading.

Capacity can be flexibly adjusted to match load demand, enhancing practicality.

Vacuum Pressure Impregnation (VPI) technology further boosts overload withstand capability.

Specification

Product	SCB18 Series 2.5 mVA dry type transformer
Rated Power	up to 6300 kVA (Customized)
Primary Voltage	6 kV, 6.3 kV, 6.6 kV, 10 kV, 10.5 kV, 11 kV, 20 kV, 22 kV (Customized)
Secondary Voltage	0.48 kV, 0.63 kV (Customized)
Tap Range	±2×2.5%, ±5% (Customized)
Vector Group	Dyn11, Yyn0 (Customized)
Frequency	50 Hz, 60 Hz (Customized)
Phase	3 phase

SCB18 (NX1) Parameter

Main technical parameters
Rated capacity (kVA)	Level1
	Electrical steel strip				Amorphous alloy
	No-load loss(W)	Load loss(W)			No-load loss W	Load loss(W)
	No-load loss(W)	B(100℃)	F(120℃)	H(145℃)	No-load loss W	B(100℃)	F(120℃)	H(145℃)
30	105	605	640	685	50	605	640	685
50	155	845	900	965	60	845	900	965
63	210	1160	1240	1330	85	1160	1240	1330
80	230	1330	1415	1520	90	1330	1415	1520
100	270	1565	1665	1780	105	1565	1665	1780
125	310	1800	1915	2050	120	1800	1915	2050
160	360	2135	2275	2440	140	2135	2275	2440
200	415	2330	2485	2665	160	2330	2485	2665
250	510	2945	3125	3355	195	2945	3125	3355
315	570	3375	3590	3850	215	3375	3590	3850
400	670	4130	4390	4705	250	4130	4390	4705
500	775	4975	5290	5660	295	4975	5290	5660
630	750	5050	5365	5760	290	5050	5365	5760
800	875	5895	6265	6715	335	5895	6265	6715
1000	1020	6885	7315	7885	385	6885	7315	7885
1250	1205	8190	8720	9335	455	8190	8720	9335
1600	1415	9945	10555	11320	530	9945	10555	11320
2000	1760	12240	13005	14005	700	12240	13005	14005
2500	2080	14535	15445	16605	840	14535	15445	16605

Transformer outgoing line methods

Conventional outgoing lines, standard sealed busbars and standard side outgoing lines are manufactured according to different interface forms. Special outgoing line methods can also be designed according to user requirements.

The transformers can be equipped with a metal casing with a protection grade of IP31,IP30,IP21,IP20 or higher according to the user’s required application scenarios.

Wide Range of Applications

Civil and Public Infrastructure

High-rise buildings, airports, railway stations, docks, metro systems, hospitals, densely populated residential areas, and other locations with strict safety and stability requirements.

Industrial and Special-Purpose Facilities

Power plants, petrochemical facilities, nuclear power stations, and other complex environments with demanding equipment performance requirements, demonstrating strong environmental adaptability.

Reinforced Structural Design

Superior Short-Circuit Withstand Capability of Coils

The coils are reinforced with fiber mesh board, delivering strong short-circuit withstand capability and long service life.

The secondary winding is wound using copper foil, ensuring excellent electrical conductivity and structural stability.

Excellent Insulation and Crack Resistance

The Vacuum Pressure Casting (VPC) process effectively improves the product's lightning impulse strength and short-circuit withstand capability.

The coefficient of thermal expansion (CTE) of the encapsulating resin closely matches that of the copper conductor, delivering strong crack resistance and preventing structural damage caused by temperature variation.

Core Difference difference between SCB18-H and SCB14-H

The only fundamental difference between SCB18-H and SCB14-H is the no-load loss P0.

Through thinner silicon steel (0.23 mm) + 45° fully mitered step-lap core + larger core cross-section, SCB18 reduces no-load loss by 15–20%, with associated benefits of lower no-load current, lower noise, and higher efficiency. The trade-off is larger size, heavier weight, and 10–20% higher price.

All other dimensions — load loss Pₖ, insulation class, electrical ratings, test standards — are identical

Video

Transformer Testing

Quality is the foundation of Tianrun Electric. Zhejiang Tianrun Electric Co., Ltd. (TENRONY) has always honored its commitment to customers of "Strict QC & Professional Testing." Before every product leaves the factory, it must pass a complete set of routine tests — winding resistance and unbalance, voltage ratio and connection symbol, short-circuit impedance and load loss, no-load loss and no-load current, insulation resistance, power-frequency applied voltage, induced voltage, and partial discharge measurement — with a test certificate and factory test report issued for every unit, ensuring that performance is verifiable and data is traceable.

The company manufactures in accordance with national and international standards including GB, IEC 60076 and IEC 60137, and holds ISO 9001 quality management system certification.

For overseas markets, it can also perform all routine tests to international standards such as AS 2374, and customers' representatives or third-party inspection agencies are welcome to witness the factory testing.