As a crucial equipment in power transmission and distribution systems, dry type transformers are widely used in local lighting, high-rise buildings, airports, docks, CNC machinery and other places. Simply put, a dry type transformer refers to a transformer whose iron core and windings are not immersed in insulating oil. Among various types, the 150 kva dry type transformer and dry type distribution transformer are highly popular in industrial and commercial scenarios due to their stable performance and wide applicability. JINSHANMEN TECHNOLOGY CO., LTD, a professional manufacturer, provides high-quality dry type transformers to meet diverse market demands.
The cooling methods of dry type transformers are divided into natural air cooling (AN) and forced air cooling (AF). When using natural air cooling, the transformer can operate continuously for a long time under rated capacity. When using forced air cooling, the output capacity of the transformer can be increased by 50%. It is suitable for intermittent overload operation or emergency accident overload operation; however, due to the large increase in load loss and impedance voltage during overload, it is in a non-economic operation state, so it should not be operated under long-term continuous overload. For the 150 kva dry type transformer, this cooling principle is particularly important, which can effectively ensure its stable operation in high-load scenarios.
I. Structural Types
Structural Performance
(1) Solid insulation encapsulated windings (2) Unencapsulated windings. Among the two windings, the one with higher voltage is the high-voltage winding, and the one with lower voltage is the low-voltage winding. From the perspective of the relative position of the high and low voltage windings, the high voltage can be divided into concentric type and overlapping type. The concentric winding is simple and easy to manufacture, so this structure is generally adopted. The overlapping type is mainly used for special transformers. This structural design is also widely used in dry type distribution transformer, ensuring its stable operation in power distribution scenarios.
II. Structural Features
1. Safe, fireproof, pollution-free, and can be directly operated in the load center; 2. Adopting advanced domestic technology, it has high mechanical strength, strong short-circuit resistance, small partial discharge, good thermal stability, high reliability and long service life; 3. Low loss, low noise, obvious energy-saving effect and maintenance-free; 4. Good heat dissipation performance, strong overload capacity, and can increase capacity operation when forced air cooling is adopted; 5. Good moisture resistance, suitable for operation in high humidity and other harsh environments; 6. Dry type transformers can be equipped with a complete temperature detection and protection system. The intelligent signal temperature control system can automatically detect and display the working temperature of each of the three-phase windings, automatically start and stop the fan, and have alarm, trip and other function settings; 7. Small volume, light weight, small floor space and low installation cost. These advantages make the 150 kva dry type transformer and dry type distribution transformer the first choice for many projects.
Iron Core
High-quality cold-rolled grain-oriented silicon steel sheets are adopted. The iron core silicon steel sheets adopt 45-degree full diagonal joints, so that the magnetic flux passes along the direction of the silicon steel sheet joints.
Winding Form
(1) Winding; (2) Epoxy resin filled with quartz sand casting; (3) Glass fiber reinforced epoxy resin casting (i.e., thin insulation structure); (4) Multi-strand glass fiber impregnated with epoxy resin winding (generally, 3 is adopted, because it can effectively prevent the cast resin from cracking and improve the reliability of the equipment).
High-Voltage Winding
Generally, multi-layer cylindrical or multi-layer segmented structure is adopted. This structure is also applied to the 150 kva dry type transformer, which improves its voltage resistance and stability.
III. Types
1. Open type: It is a common form, whose body is in direct contact with the atmosphere. It is suitable for relatively dry and clean indoor environments (when the ambient temperature is 20 degrees, the relative humidity should not exceed 85%). Generally, it has two cooling methods: natural air cooling and forced air cooling. 2. Closed type: The body is in a closed shell and not in direct contact with the atmosphere (due to poor sealing and heat dissipation conditions, it is mainly used for mining and is explosion-proof). 3. Cast type: Epoxy resin or other resins are used for casting as the main insulation. It has a simple structure and small volume, and is suitable for transformers with small capacity. Among them, the cast type is often used in dry type distribution transformer, which is suitable for small and medium-sized power distribution scenarios.
IV. Technical Parameters
1. Operating frequency: 50 / 60HZ; 2. No-load current: < 4%; 3. Withstand voltage strength: No breakdown at 2000V / min; Testing instrument: YZ1802 withstand voltage tester (20mA); 4. Insulation class: Class F (special class can be customized); 5. Insulation resistance: ≥2M ohm; Testing instrument: ZC25B-4 megohmmeter.
V. Working Environment
1. Ambient temperature: 0 - 40 (℃), relative humidity <70%; 2. Altitude: No more than 2500 meters; 3. Avoid being exposed to rain, moisture, high temperature, high heat or direct sunlight. The distance between its heat dissipation and ventilation holes and surrounding objects should not be less than 40cm (1000px); 4. Prevent working in places with more corrosive liquids, gases, dust, conductive fibers or metal debris; 5. Prevent working in places with vibration or electromagnetic interference; 6. Avoid long-term inverted storage and transportation, and do not subject to strong impact. To ensure the service life of the 150 kva dry type transformer and dry type distribution transformer, it is necessary to strictly abide by the above working environment requirements.
About JINSHANMEN TECHNOLOGY CO., LTD
As a professional manufacturer of power transmission and distribution equipment, JINSHANMEN TECHNOLOGY CO., LTD mainly produces oil immersed power transformers, dry-type power transformers, oil immersed three-dimensional coiled power transformers, dry-type three-dimensional coiled power transformers, mining explosion-proof dry-type transformers, mining explosion-proof mobile substations, amorphous alloy power transformers, on load capacity regulating power transformers, locomotive dry-type transformers, as well as prefabricated substations, modular substations, wind energy box type substations, high and low voltage switchgear and other transmission and distribution equipment. The company has rich production experience and advanced production technology, providing high-quality 150 kva dry type transformer and dry type distribution transformer for global customers, and providing comprehensive technical support and after-sales service.