35kV Oil-immersed Power/Distribution Transformer
2.Frequency:50/60Hz
3.Capacity:800~31500kva
4.Rated voltage:35kV
5.Winding material:copper\Aluminum
6.Taping range of HV:±5%
7. Features S9 (off-circuit tap changer) and SZ9 (on-load tap changer) models.
- Fast Delievery
- Quality Assurance
- 24/7 Customer Service
Product Introduction
1.35kV Oil-immersed Power/Distribution Transformer: Reliable Energy Solutions for Modern Grids
The 35kV Oil-immersed Power/Distribution Transformer is engineered to deliver stable voltage conversion for industrial, utility, and infrastructure projects. With input voltages up to 35kV and output ranges from 3.15kV to 10.5kV, this transformer ensures efficient energy distribution across diverse applications. Built with copper or aluminum windings and available in capacities from 800kVA to 31,500kVA, it supports both S9 (off-circuit) and SZ9 (on-load) tap changers for precise voltage regulation.
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2.Technical Specifications
| Parameter | Details |
|---|---|
| Input Voltage | 35kV |
| Output Voltage | 10.5kV / 6.3kV / 3.15kV/0.4KV |
| Frequency | 50Hz / 60Hz |
| Capacity Range | 800–31,500kVA |
| Tapping Range (HV) | ±5% |
| Efficiency | ≥98.5% at 50–100% load |
| Noise Level | ≤65dB at 1m |
| Type | Rated Capacity (kVA) | Voltage combination | Connection Symbol | No-load Loss (kW) |
Load Loss (kW) |
No-load Current | Short-circuit impedance (%) | ||
| HV(kV) | Tapping Range of HV | LV(kV) | |||||||
| SZ9-1000/35 | 1000 | 35 | ±3×2.5% | 0.4 | Yyn0 | 1.55 | 12.78 | 1.2 | 6.5 |
| SZ9-1250/35 | 1250 | 1.88 | 15.41 | 1.2 | 6.5 | ||||
| SZ9-2500/35 | 2000 | ±3×2.5% ±2×2.5% | 6.3 10.5 | Ydll | 2.88 | 20.25 | 1.1 | 6.5 | |
| SZ9-3150/35 | 2500 | 3.4 | 21.74 | 1.1 | 6.5 | ||||
3.Key Features & Advantages
1. High Efficiency & Low Losses
Optimized core design reduces no-load losses by 20% compared to conventional models, aligning with global energy-saving mandates.
2. Robust Construction
- Withstands short-circuit currents for ≥3 seconds (IEC 60076-5 certified).
- Operates reliably in temperatures from -30°C to +45°C.
3. Smart Monitoring Ready
Pre-installed sensors for dissolved gas analysis (DGA) and temperature tracking enable predictive maintenance.
4. Eco-Friendly Design
Leak-proof tank sealing and biodegradable oil options minimize environmental risks.
4.Applications
Be used in a wide range of industries.

Industrial Plants
Eliminate power factor penalties in CNC machines and assembly lines while handling surge currents up to 100x rated capacity.

Substation
Stabilizes substation voltage against harmonics and intermittent generation from renewable inverters.

Commercial Buildings
Retrofit aging systems in hospitals or malls with silent (<45dB), flame-retardant capacitors that meet NFPA 70 fire codes.
5.Design & Construction
The transformer’s layered core structure minimizes magnetic flux leakage, while corrugated tank walls enhance cooling efficiency. Radiators are detachable for easier transportation, and the on-load tap changer (SZ9 model) allows voltage adjustments without interrupting supply.
6.Manufacturing & Quality Control
Every 35kV Oil-immersed Power/Distribution Transformer undergoes:
- Material Testing: Grain-oriented silicon steel validated for low hysteresis.
- Leak Checks: 24-hour pressure tests at 1.5x rated capacity.
- Final Inspection: IEC 60076 compliance audits and load loss verification.
7.Why Choose Us?
- Certifications: ISO 9001, ISO 14001,.
- R&D Excellence: 15+ patents in transformer cooling and fault detection.
- Global Support: 24/7 technical assistance and localized spare parts networks.



8.FAQ
1. What tilt angles are safe during transportation?
Max 15° on the major axis and 10° on the minor axis to prevent oil displacement.
2. Can IoT sensors be added post-installation?
Yes—our modular design supports retrofitting for real-time monitoring.
3. How often should oil testing be done?
Annual dissolved gas analysis is recommended for early fault detection.
4. Are seismic-resistant models available?
Yes—units compliant with IEEE 693 are offered for earthquake-prone regions.
9.Contact Us
Email: xaxd_electric@163.com
Request a 35kV Oil-immersed Power/Distribution Transformer customized quote or technical datasheet today!
10.Factory Show


11.Equipment Display

12.Application Cases
State Grid systems, power engineering, steel and metallurgy, petrochemicals, rail transportation, energy and water conservancy, construction, environmental protection, and renewable energy sectors
13.Team and Exhibition

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