Dry-Type Transformer Intelligent Temperature Monitoring & Protection System Principle
The operational safety, stability and full-service lifespan of dry-type transformers are primarily determined by the reliability of the winding insulation system. During long-term continuous operation, overload conditions, ambient temperature rise, abnormal grid fluctuations and poor heat dissipation may cause winding temperature to rise sharply. Once the operating temperature exceeds the long-term withstand limit of the insulating materials, irreversible insulation aging, performance degradation, local carbonization and insulation breakdown will occur, eventually leading to transformer failure, equipment shutdown and even safety accidents. Therefore, real-time precise temperature monitoring, automatic cooling adjustment, over-temperature early warning and emergency tripping protection constitute the core technical guarantee for the safe and long-cycle operation of dry-type transformers.
Modern high-performance dry-type transformers are equipped with a complete intelligent temperature control and detection system, which integrates temperature signal acquisition, automatic fan linkage control, over-temperature alarm protection, emergency tripping and real-time temperature display transmission functions. The system realizes full-cycle intelligent monitoring and active protection of winding and core temperature, effectively avoiding thermal damage to insulation caused by abnormal temperature rise. The core functional modules are detailed as follows:
1. Intelligent Automatic Fan Cooling Control System
To ensure stable heat dissipation under variable load conditions, the transformer is equipped with a high-precision temperature linkage fan control module. High-sensitivity Pt100 platinum thermistors are pre-embedded at the hottest key positions of the low-voltage windings, which can accurately capture real-time winding temperature changes and continuously feed back temperature signals to the intelligent temperature controller.
When the transformer operating load increases gradually and the winding temperature rises to 110°C, the system automatically triggers the cooling fan group to start, implementing forced air cooling (AF) to accelerate air circulation inside the transformer body, rapidly reduce winding operating temperature and ensure the equipment maintains stable output capacity under peak load. When the load decreases and the winding temperature drops steadily to 90°C, the system automatically stops the fan operation to reduce unnecessary energy consumption and operating noise. This intelligent temperature-based start-stop logic realizes adaptive heat dissipation adjustment, balancing operational safety and energy-saving performance.
2. Over-Temperature Alarm & Emergency Tripping Protection Function
In order to deal with extreme working conditions such as sudden overload, abnormal grid impact and blocked heat dissipation, the transformer adopts independent PTC nonlinear thermistor temperature sensing elements embedded in the low-voltage windings to collect accurate temperature data of windings and iron cores in real time, forming a dual safety protection mechanism of early warning and emergency protection.
When the internal temperature continues to rise abnormally and reaches 155°C, the system immediately outputs an over-temperature alarm signal. The on-site alarm device is triggered to remind operation and maintenance personnel to check the load status, heat dissipation environment and equipment operation faults in a timely manner, so as to eliminate hidden dangers in advance and avoid further temperature rise. If the fault cannot be eliminated in time and the winding temperature continues to soar to the critical limit of170°C, the insulation system will face irreversible failure risks. At this time, the system will immediately send an over-temperature tripping instruction to the secondary protection loop to cut off the power supply quickly, force the transformer to stop operation, and thoroughly prevent major accidents such as insulation breakdown, short-circuit burnout and equipment explosion caused by over-temperature.
3. Multi-Functional Real-Time Temperature Display & Remote Transmission System
Supported by high-precision Pt100 temperature sensing components, the system realizes real-time sampling and dynamic display of three-phase winding temperature. It supports independent temperature inspection of each single-phase winding and real-time display of the maximum temperature value of the three phases, and can automatically record and store the historical highest temperature data during operation. This function helps operation and maintenance personnel track the temperature change law of the transformer, judge load operation status and analyze potential equipment aging problems.
In terms of signal output and remote monitoring, the system can convert the highest operating temperature into standard 4-20mA analog signal output, which is compatible with various industrial control systems and power monitoring platforms. It supports long-distance signal transmission up to 1200 meters, realizing remote real-time temperature monitoring, data recording and abnormal data backtracking. It is suitable for unattended substation, centralized power distribution room and intelligent grid management scenarios, greatly improving the intelligent operation and maintenance level of dry-type transformers.
Technical Advantages Summary
The integrated intelligent temperature monitoring system realizes full-range coverage from daily heat dissipation adjustment, abnormal temperature early warning to extreme fault protection. It effectively suppresses insulation aging caused by over-temperature, greatly improves the operational reliability and service life of dry-type transformers, and provides standardized, intelligent and reliable safety guarantees for industrial power distribution, urban grid, commercial buildings and other key scenarios.
About us
Zhejiang Lvma Electric Co., Ltd. (2018) builds on 17 years of accumulated knowledge in electrical equipment. Certified to ISO 9001:2015, we produce intelligent switchgear alongside high-performance oil-immersed and dry-type distribution transformers. Our export markets include Europe, the Middle East, South America, Southeast Asia, and Africa.
Our R&D team holds more than 40 patents, enabling us to transform from a conventional maker into an innovator in smart, sustainable power systems. With digital production lines and continuous monitoring, we provide safe, dependable, and forward-looking electrical solutions.