China is a global leader in the production of dry type power transformers, with an annual output of resin-insulated dry type power transformers reaching 10,000 MVA. Products are developing towards low noise and energy-saving directions, boasting world-class manufacturing standards and performance indicators. As a professional manufacturer, JINSHANMEN TECHNOLOGY CO., LTD is committed to providing comprehensive power transmission and distribution solutions for global customers, with in-depth layout in the dry type power transformer field and continuous technological innovation to meet evolving market demands.
1.Temperature Control System
Insulation damage is a major cause of transformer failures, and winding overheating is the core risk to insulation. Therefore, temperature monitoring and alarming during operation are crucial. Taking the TTC-300 temperature control system as an example:
Automatic Fan Cooling: A thermistor is pre-embedded at the hottest point of the low-voltage winding to collect temperature signals. When the dry type power transformer load increases and the temperature rises to 110℃, the fan starts automatically; when the temperature drops below 90℃, the fan stops.
Over-temperature Alarm and Trip: PTC thermistors monitor the temperature of windings and iron cores in real time. An over-temperature alarm is triggered at 155℃, and a trip signal is sent to the secondary protection circuit at 170℃ to ensure equipment safety.
Temperature Display and Remote Transmission: Temperature data is output via a 4-20mA current analog signal. A computer interface can be added for remote transmission within 1200 meters, and a single transmitter can monitor 31 dry type power transformers, simultaneously enhancing over-temperature protection.
2.Protection Method Selection
Transformer enclosures should be selected based on operating environment and protection requirements. Common protection classes include:
IP20 Protection Enclosure: A standard choice that prevents small animals (such as cats, mice, snakes, and birds) and foreign objects with a diameter >12mm from entering, avoiding short circuits and protecting live parts.
IP23 Protection Enclosure: Suitable for outdoor use. In addition to IP20 functions, it can resist water droplets within a vertical 60° angle. However, attention should be paid to its impact on heat dissipation and reasonable planning of operating capacity, especially for high-demand units like the 630 kva dry type transformer.
3.Cooling Method Application
Dry type power transformers mainly adopt two cooling methods to adapt to different operating scenarios:
Air Natural Cooling (AN): Suitable for continuous operation within rated capacity. For example, the 630 kva dry type transformer often uses this method under normal working conditions for lower energy consumption and stable performance.
Forced Air Cooling (AF): Can increase the transformer's output capacity by 50%, suitable for discontinuous loads or emergency load operation. However, it should be noted that impedance voltage and load loss will increase in this mode, so long-term use is not recommended for sustained efficiency.
4.Rational Utilization of Overload Capacity
The overload capacity of dry type power transformers is affected by multiple factors, and scientific utilization can optimize configuration efficiency:
Capacity Optimization: For scenarios with short-term impact overload (such as steel rolling and welding equipment) or uneven loads (such as residential lighting, shopping malls, and air conditioning systems), the overload capacity of the 630 kva dry type transformer can be used to appropriately reduce the rated capacity, allowing the equipment to operate at full load or intermittent overload during main working hours.
Reduction of Standby Configuration: For projects with high standby coefficient requirements, the overload capacity of dry type power transformers can reduce standby capacity and the number of standby units. Note: When operating under overload, if the temperature rises to 155℃ (alarm triggered), load reduction measures should be taken promptly to prioritize the power supply for critical loads.
5.Low-Voltage Outlet Modes & Interface Coordination
Dry type power transformers are free of oil pollution, fire, and explosion risks, and do not require separate machine rooms. Especially the SC (B) 9 series products with ultra-low loss and noise can be installed in the same room as low-voltage switchboards. Their flexible outlet modes adapt to different power distribution needs:
Low-Voltage Standard Closed Busbar: Compatible with closed busbars (plug-in busbars/dense busducts). IP20 enclosed products are equipped with closed busbar flanges, while IP00 non-enclosed products provide standard terminals for easy connection.
Low-Voltage Standard Horizontal Side Outlet: Suitable for side-by-side installation with GGD, GCK, MNS, and other low-voltage switchboards. The interface dimensions between the transformer manufacturer and switchgear manufacturer should be confirmed in advance to ensure smooth on-site installation.
Low-Voltage Standard Side Outlet (Vertical): Adaptable to domino-style vertically arranged switchboards, with similar installation convenience to horizontal side outlets, optimizing space utilization in compact power rooms.
6.Development Trends of Dry Type Power Transformers
The global dry type power transformer industry is evolving towards low energy consumption, high reliability, and multi-functional integration. Key development trends include:
Low Energy Consumption and Low Noise: Adopting high-quality silicon steel sheets, foil windings, and precision stepped iron cores, combined with new processes to reduce loss and noise, achieving better environmental performance and meeting global green energy standards.
High Reliability: Improving product lifespan and operational stability through full-process process optimization and basic engineering research, reducing maintenance costs for customers.
Environmental Certification: Complying with HD464 standards, improving certifications for C0/C1/C2 climate resistance, E0/E1/E2 environmental resistance, and F0/F1/F2 fire resistance grades to meet diverse regional regulatory requirements.
Capacity Expansion: Expanding from 50KVA-2500KVA distribution transformers to 10000KVA-20000KVA power transformers to meet the capacity expansion needs of urban load centers and large industrial projects.
Functional Integration: Integrating protective enclosures, air cooling systems, temperature monitoring interfaces, current transformers, power metering, and other functions to provide integrated solutions and simplify system configuration.
Field Expansion: Extending from traditional power distribution fields to wind energy, mining, locomotives, modular substations, and other multi-fields, broadening the application scope of dry type power transformers.
To keep pace with these industry trends, JINSHANMEN TECHNOLOGY CO., LTD has developed a comprehensive product portfolio covering 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, and high and low voltage switchgear. With professional R&D capabilities and strict quality control, the company delivers reliable, efficient, and environmentally friendly transmission and distribution equipment to global partners, supporting the stable operation of various industrial and commercial power systems.