Product overview
As a leading manufacturer of power distribution transformer, QIANLAI proudly present our 3000kVA oil immersed transformer—a robust, energy-saving solution engineered for demanding industrial, commercial, and utility power distribution systems. This oil immersed transformer complies with global standards like IEC 60076, IEEE C57, and ANSI, delivering unrivaled reliability, low operational losses, and long service life, making it the preferred choice for grid upgrades, manufacturing plants, and critical infrastructure projects worldwide.
Main technical Parameter
| Rated capacity | 3000 KVA |
| Primary voltage | 33KV/35KV/13.2KV/11KV/10KV/6.3KV/6KV(customizable) |
| Tap changer | ±2*2.5/±5 |
| Secondary voltage | 400V/415V/433V/380V(customizable) |
| Vector group | Dyn11/Yzn11/Yyn0 |
| Number of phase | Three phase |
| frequency | 50hz |
| Temperature rise | 65K |
| Short circuit impedance | 4.0% |
| No load loss | Different series(S10,S11,S13,S14),got different loss data |
| Load loss 75ºC | Different series(S10,S11,S13,S14),got different loss data |
| Cooling type | ONAN |
| Oil type | 25#/45# |
| standards | IEC 60076-1 |
3000 Oil Immersed Transformer: Operating Noise Explanation
The noise produced by oil-immersed transformers during operation is a normal acoustic phenomenon, mainly derived from core vibration, supplemented by winding and cooling system vibrations. Abnormal noise can indicate potential faults, serving as a key indicator for equipment health.
- Main Noise Sources
Iron Core Vibration (70%-80% of total noise)
Caused by magnetostriction of silicon steel sheets under alternating magnetic fields (50Hz grid frequency leads to 100Hz vibration). Noise level is affected by core material, lamination process and magnetic flux density.
Winding Vibration (10%-20% of total noise)
Electromagnetic force from load current induces radial and axial winding vibration, which overlays with core noise.
Cooling System & Components
Fans (ONAF type) and oil pumps (OFAF type) generate medium-low frequency noise via rotation and fluid impact. Loose fasteners or accessories may cause resonant noise.
- Abnormal Noise & Fault Warnings
A normally operating transformer emits a stable, uniform humming sound. Watch for these abnormal signs:
- Loud, sharp humming: Possible over-high magnetic flux density, excessive grid voltage or loose core bolts.
- Crackling discharge sound: Indicates insulation degradation or partial discharge (e.g., bushing pollution, winding insulation damage).
- Clinking metal noise: May be loose silicon steel sheets, winding deformation or internal foreign objects.
- Fluctuating noise: Related to severe load changes or poor tap changer contact.
- Timely inspection of abnormal noise helps prevent equipment failures and ensure stable operation.
