Product description
The 4000KVA dry-type transformer is safe, flame retardant, fireproof, pollution-free, and can be installed directly in the load center. Maintenance-free and easy to install. It has good moisture-proof performance and can be put into operation without pre-drying after being out of operation. Low loss, low partial discharge, low noise, 120% under forced air cooling conditions Rated load operation. It has a complete temperature protection control system to provide a reliable guarantee for the safe operation of 4000KVA dry-type transformer. The reliability index of 4000KVA dry-type transformer has reached the domestic advanced level.
4000KVA dry-type transformer open type
1. It is a commonly used form, its body is in direct contact with the atmosphere, suitable for a relatively dry and clean room, (when the ambient temperature is 20 degrees, the relative humidity should not exceed 85%), and there are generally two cooling methods: air self-cooling and air cooling.
2. Closed type: the vessel is in a closed shell and is not in direct contact with the atmosphere (due to poor sealing and heat dissipation conditions, it is mainly used for mining and belongs to the explosion-proof type). 3. Pouring type: Epoxy resin or other resin casting as the main insulation, it has a simple structure and small size, and is suitable for transformers with smaller capacity Features of structural temperature control system: The safe operation of dry-type transformer and its service life largely depend on the safety and reliability of transformer winding insulation.
4000KVA dry-type transformer cooling method
The cooling method of 4000KVA dry-type transformer is divided into natural air cooling (AN) and forced air cooling (AF). When naturally air-cooled, the transformer can operate continuously for a long time at the rated capacity. When forced air cooling, the output capacity of the transformer can be increased by 50%. It is suitable for intermittent overload operation, or emergency overload operation; Because the load loss and impedance voltage increase greatly during overload, it is in a non-economic operating state, so it should not be in long-term continuous overload operation.
Technical parameters
1. Frequency: 50 / 60HZ;
2. No-load current: < 4 %;
3. Voltage strength: 20000V / min without breakdown; Test instrument: YZ1802 voltage resistance tester (20mA); 4.
4. Insulation grade: F grade (special grade can be customized).
5. Insulation resistance: ≥2M test instrument: ZC25B a 4-type megohmmeter <1000 V); 6.
6、Connection mode: Y/Y, △/Y0, Yo/△, autocoupling (optional);; 7.
7. Allowable temperature rise of coil: I00K; 8.
8. Heat dissipation mode: natural air cooling or temperature control automatic heat dissipation.
9. Noise factor: ≤30dB.
4000KVA dry-type transformer working environment
1.0 – 40 (°C), relative humidity <70%;
2. Altitude: no more than 2500 meters;
3. Avoid exposure to rain, moisture, high temperatures, high heat or direct sunlight. The heat dissipation vent should be at least 40cm away from the surrounding objects;
4. Prevent working in places with more corrosive liquids, or gases, dust, conductive fibers or metal fines;
5. Prevent working in vibration or electromagnetic interference places;
6. Avoid long-term inverted storage and transportation, and cannot be subjected to strong impact.
