Integrated OLTC and automated core enable auto voltage regulation and 150% overload capacity for sub-transmission.
On-load tap changer enables automatic voltage adjustment under full load, eliminating downtime for tap changes and stabilizing supply in networks with high renewable penetration or fluctuating industrial loads.
Intelligent shearing and stacking line reduces no-load loss by 5% and noise by 5dB versus manual processes; 7-step 45° full-mitered joints further cut excitation current by ~30%, ensuring stable performance over 30-year lifespan.
Optimized AF cooling system validated for continuous 150% rated load operation with documented hotspot margins per IEC 60076-12, supporting peak demand and emergency backup without insulation degradation.
Mirror-finish self-leveling casting prevents cracking and moisture ingress; high mechanical strength and short-circuit withstand exceed IEC 60076-11 requirements for 33kV/35kV fault levels and surge environments.
F1/E2/C2 fire classification allows direct installation in populated or enclosed spaces; oil-free design eliminates spill containment and reduces lifecycle OPEX by >60% versus oil-filled equivalents.
No-load loss and noise measured per IEC 60076-1 on every unit; OLTC cycle testing confirms 10,000+ operations without contact degradation; test reports reference actual automated-line batch data.
Partial discharge <10pC at 1.5Um; lightning impulse and induced voltage tests confirm insulation coordination for 33kV/35kV systems; visual inspection documents mirror-finish surface quality.
AN/AF temperature rise tested at rated and 150% overload; hotspot measurements verify compliance with IEC 60076-12 emergency loading guidelines under OLTC operation.
Units carry CE mark for EU, UL listing for North America, and CCC for China; all tests performed in CNAS-accredited lab with reports traceable to IEC 60076-11, GB/T10228, and GB20052-2024.
| Rated Capacity | Voltage Combination | Vector Group | No-Load Loss(w) | Load Loss | No-Load Current (%) | Short Circuit Impedance (%) | ||
| (kVA) | ||||||||
| High Voltage（kV) | Tapping Range | Low Voltage (kV) | ||||||
| 800 | 33- 38.5 |
±5% ±2×2.5% |
3.5 6 6.3 10 10.5 11 |
Dyn11 Yd11 Yd11 Yyn11 |
2200 | 9400 | 1.1 | 6 |
| 1000 | 2610 | 10800 | 1.1 | |||||
| 1250 | 3060 | 11900 | 1 | |||||
| 1500 | 3600 | 15400 | 1 | |||||
| 2000 | 4130 | 18200 | 0.9 | 7 | ||||
| 2500 | 4750 | 21800 | 0.9 | |||||
| 3150 | 5880 | 24500 | 0.8 | 8 | ||||
| 4000 | 6860 | 29400 | 0.8 | |||||
| 5000 | 8180 | 34960 | 0.7 | |||||
| 6300 | 9680 | 40800 | 0.7 | |||||
| 8000 | Dyn11 Yd11 YNn11 |
11000 | 46060 | 0.6 | 9 | |||
| 10000 | 6 6.3 10.5 11 |
12660 | 56500 | 0.6 | ||||
| 12500 | 15400 | 64600 | 0.5 | |||||
| 16000 | 18900 | 76000 | 0.5 | |||||
| 20000 | 22400 | 85500 | 0.4 | 10 | ||||
Standard ±8×1.25% or custom tap ranges/step voltages to match local 33kV/35kV grid codes; optional motor drive brands and remote control interfaces for SCADA integration.
Oxygen-free copper for maximum short-circuit withstand and OLTC cycling endurance, or EC-grade aluminum with proprietary brass-rod joints for cost optimization; both validated for mirror-finish casting adhesion.
Natural air convection (AN) for base load; forced-air fans (AF) with thermostatic control for 150% overload; optional redundant fan sets and alarm contacts for N+1 redundancy in critical voltage-regulation nodes.
Bare coil for clean indoor switchgear rooms; IP20 ventilated steel enclosure for general indoor use; IP23D stainless steel weatherproof housing with anti-condensation heaters for outdoor/sheltered deployment.
Embedded PT100 sensors in LV coils, core clamps, and OLTC mechanism with Modbus/IEC 61850 outputs; optional OLTC position indicators, contact wear monitors, and third-party thermostat brands.
Custom dimensions to fit existing 33kV/35kV switchgear footprints; RAL color matching; bilingual nameplates with QR codes linking to digital manuals, OLTC maintenance guides, and test certificates.
No-load and load losses optimized to exceed GB20052-2024 Tier 1 or client-specific targets; custom loss guarantees backed by actual automated-line core batch test data.
Tell us your project requirements—voltage level, environment, grid code, or delivery timeline—and we’ll provide a compliant, optimized solution.
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