Durable Three Phase Oil Immersed Transformer
1.On-load voltage regulation without power outage
Adopts real on-load tap changing, which can adjust voltage during operation without affecting power supply, ensuring more stable voltage.
2.Low loss and high energy efficiency
Significantly lower loss than old-type S7 and S8 transformers, obvious power saving in long-term operation and lower operation cost.
3.Strong short-circuit withstand capability and safe operation
With firm winding structure and reliable insulation, it can withstand power grid short-circuit impact with low failure rate.
4.Fully sealed structure and long service life
The oil tank is well sealed, preventing transformer oil from moisture and oxidation. It is easy to maintain and has a longer service life.
5.Low noise and excellent heat dissipation
Adopts advanced iron core technology with low no-load noise; self-cooling design is suitable for long-term full-load operation.
6.Complete protection and high reliability
Equipped with gas relay, pressure relief valve, thermometer, etc., providing multiple safety protections.
7.Wide application range
Widely used in urban and rural power grids, factories, mines, residential quarters, commercial buildings, etc., with strong universality.
Product Details of SZ9 Series Transformer
I. Product Introduction
SZ9 is a three-phase oil-immersed on-load tap-changing power transformer, suitable for 50Hz power systems with voltage levels of 6kV, 10kV and 35kV. It serves as key power transformation equipment for urban and rural power grids, industrial and mining enterprises, and commercial complexes.
The product is designed and manufactured in accordance with national standards GB 1094 and GB/T 6451. It adopts high-permeability silicon steel sheets, oxygen-free copper windings and on-load tap changers, enabling voltage regulation under load without power interruption. It features low loss, high stability and long service life, satisfying stable power supply for scenarios with large voltage fluctuation and high power quality requirements.
II. Core Technical Parameters(Customizable)
Basic Specifications
Rated Capacity:
100~2500kVA (10kV class);
2000~16000kVA (35kV class)
Voltage Combination:
10±4×2.5%/0.4kV;
35±3×2.5%/10.5kV
Connection Group: Yyn0, Dyn11
Cooling Mode: ONAN (Oil-Immersed Natural Cooling)
Insulation Class: Class B
Voltage Regulation: On-load tap changing (switching without power outage)
Typical Performance (10kV class)
| Rated Capacity (kVA) | No-load Loss (W) | Load Loss (W) | Short-circuit Impedance (%) | No-load Current (%) |
200 | 480 | 3060 | 4.0 | 1.5 |
400 | 670 | 4300 | 4.0 | 1.4 |
500 | 800 | 5100 | 4.0 | 1.3 |
800 | 1150 | 7500 | 4.5 | 1.1 |
1000 | 1300 | 9200 | 4.5 | 1.0 |
1250 | 1520 | 10800 | 4.5 | 0.9 |
Safety & Protection
Protection Devices: Pressure relief valve, gas relay, signal thermometer
Insulation Level: LI75AC35 (10kV); LI200AC85 (35kV)
III. Main Features
Voltage stabilization under load, no power outage
On-load tap changer supports manual, automatic and remote control. Voltage can be adjusted accurately during operation, adapting to large grid fluctuation and ensuring stable power quality.
Ultra-low loss, long-term energy saving
Adopts high-permeability silicon steel sheet and multi-step lap core. No-load and load losses are obviously better than S7/S8 series, with remarkable annual power saving effect and lower operation cost.
Reliable structure, strong short-circuit withstand
Equipped with oxygen-free copper windings, corrugated oil ducts and new insulation structure with high mechanical strength. The core is firmly fixed and has passed sudden short-circuit test for safer operation.
Fully sealed and durable, easy maintenance
Corrugated oil tank and fully sealed structure delay oil aging. Complete protection devices are standard configured, free of frequent maintenance, suitable for both indoor and outdoor installation.
Standardized and customizable
In compliance with national and IEC standards. Optional functions such as forced air cooling, temperature control and remote monitoring are available to meet different grid and load demands.
IV. Application Scenarios
Power Grid Distribution: Urban and rural substations, industrial park substations, residential quarter distribution rooms
Industrial Manufacturing: Mining, metallurgy, chemical industry, textile, electronics and other voltage-sensitive production lines
Commercial Infrastructure: Shopping malls, hospitals, data centers, rail transit, airports and stations
Special Scenarios: Areas with unstable voltage at grid ends, public facilities with large load fluctuation
