Precimeasure Winding Temperature Indicator

We employ a key technology that makes the most concealed risks inside a transformer clearly visible. Traditional methods only measure oil temperature, while real danger often originates at the inaccessible winding hot spots. To address this, we innovatively use an analog monitoring technology based on "bimetallic strip + CT current coupling." This allows a heating element within the controller to vary in real-time with the transformer's load current, accurately simulating the temperature at the winding's hottest point. This means you can not only read the current temperature intuitively from a prominent 4-inch dial but also track historical peaks via a resettable pointer. We deliver a fundamental leap in monitoring accuracy, empowering you to proactively protect the transformer's insulation life and keep operational safety firmly in your control.

Accurately understanding the transformer's overall thermal state is critical for fault prevention. Therefore, our designed Oil Temperature Indicator (OTI) places an oil-corrosion-resistant, high-temperature-tolerant sensor probe directly into the transformer oil chamber. Using a fully sealed liquid expansion system, it reliably captures the key data of top-oil temperature in real-time. This provides you with the most direct "eyes" on the transformer's thermal condition, ensuring you receive continuous, stable temperature monitoring under any complex operating scenario. This establishes a solid, reliable foundation for implementing precise protection and informed maintenance decisions.

We place intelligent control capability at the core of the product. It integrates high-precision micro-switches, a current conversion unit, and remote interfaces. Based on real-time winding and oil temperature data, it can automatically and accurately start/stop cooling systems or trigger alarms. This achieves the crucial leap from passive monitoring to active regulation. Furthermore, through standard 4-20mA signal output, data integrates seamlessly into your PLC, DCS, or remote monitoring platforms. What we build for you is a solution that combines local automatic protection with remote centralized management, significantly enhancing transformer operational reliability and control efficiency, making intelligent maintenance a practical reality.

When transformer load changes, the Precimeasure Winding Temperature Indicator first predicts winding temperature rise trends via CT current variation, triggering early warnings. If temperatures continue to rise, the oil temperature module simultaneously detects excessive top-oil temperature, prompting the system to immediately initiate a staged cooling strategy (energy-saving operation at light load, forced cooling at heavy load). Once temperatures fall back to safe thresholds, the cooling equipment automatically shuts off. This achieves fully automated "prediction-protection-energy saving" process control.

We know that traditional solutions monitoring only oil temperature have a warning blind spot. Therefore, our solution innovatively provides dual, precise monitoring of both "winding hot-spot" and "oil temperature." This allows you to simultaneously track the oil temperature, which reflects the overall cooling state, and directly see the temperature at the winding's hottest spot, which determines insulation life. By intelligently analyzing data from these two critical dimensions, the system can distinguish between "local overheating from a sudden load change" and "overall temperature rise due to cooling failure," fundamentally avoiding misjudgments and missed alarms inherent in single-point monitoring. This builds a more proactive and reliable safety protection system for you, elevating hazard identification to a new level and ensuring transformer operational risks are always known and controllable.

In harsh operating conditions, external power supply reliability and frequent on-site maintenance represent hidden costs and risks. That's why we designed the product to operate and perform switching locally using precise physical expansion principles, completely eliminating reliance on external power and removing the root cause of protection failure due to power issues. Simultaneously, its fully sealed construction ensures long-term stability in complex environments without requiring on-site calibration or trimming. Through this series of "maintenance-free" design choices, we aim to significantly reduce your long-term operational burden and potential risks, making safety protection truly reliable and hassle-free.

Our solution, through its core CT current coupling technology, overcomes the thermal inertia limitations of traditional oil temperature monitoring: it can sense winding temperature rise trends in advance when load suddenly increases, even before the oil temperature rises significantly. This allows for a reduced safety margin and earlier cooling activation, solving the overheating risks caused by response delays in traditional approaches. Furthermore, the system supports staged cooling control based on temperature gradients (forced/balanced/economy modes), avoiding energy waste at light loads while ensuring sufficient cooling capacity at heavy loads. This enables you to achieve more proactive safety protection and more precise energy management simultaneously, significantly lowering long-term operating costs while ensuring transformer stability.

Because the equipment must operate stably for long periods in demanding industrial environments, we built the product with a durable aluminum alloy housing and a high IP65 protection rating, making it resistant to dust, moisture, and oil contamination. It has passed rigorous 2kV withstand voltage tests and supports a wide 90-260V power supply input, meeting core industrial requirements for both safety and adaptability. More importantly, we offer flexible customization-whether for temperature ranges or capillary lengths-tailored to your specific model and installation scenario. All this design aims to deliver a solution that is not only reliable and durable but also integrates seamlessly into your existing systems, fundamentally reducing long-term adaptation costs and operational risks.

We designed flexible monitoring for you that combines on-site intuitiveness with remote digital access. On-site, large analog dials with traceable maximum temperature records allow inspection personnel to understand the status at a glance. Remotely, clear LED digital displays (0.1°C resolution) and standard Modbus communication enable seamless data integration into your monitoring systems. More critically, we built a multi-layered fault warning mechanism: when temperatures exceed limits, the device simultaneously triggers local audible/visual alarms and remote signal feedback. This not only lets you monitor temperature changes anytime, anywhere but also enables rapid fault location and response when anomalies occur. This Precimeasure Winding Temperature Indicator is central to this capability, significantly reducing the risk of unplanned downtime and adding a dual layer of assurance for stable operation.

Winding temperature measurement accuracy reaches ±1.5% FSD (Full Scale), and oil temperature measurement accuracy is ±4°C within the critical 40-110°C range, with a temperature resolution of 0.1°C, ensuring precise and trustworthy data. The bimetallic strips undergo special heat treatment for superior thermal stability and long-term operation without drift

The equipment passes a 2kV AC/50Hz high-potential test (terminals to ground), enabling it to withstand high-voltage interference generated by transformer operation. It complies with the IEC 61000-4 series of EMC standards, offering strong immunity to electrostatic discharge and electrical fast transients, ensuring stable performance in complex industrial electromagnetic environments.

The built-in Current Converter Unit (CCU) supports PT100 RTD signal input and outputs two standard 4-20mA signals, allowing simultaneous connection to local indicators, remote monitoring, and control systems. The switch contacts are potential-free (dry contacts) with a rating of 5A@250V AC, capable of directly driving medium-to-high power cooling equipment without requiring additional relay amplification.

The device enclosure has an IP65 protection rating, and the sensor is rated IP55. It operates within an ambient temperature range of -20°C to 70°C. Having undergone multiple reliability tests-including low temperature (0°C), dry heat (70°C), and vibration (10-55Hz)-in compliance with the IEC 60068 series of standards, it is well-suited for harsh conditions such as outdoor, high-temperature, and dusty environments.