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DIRECT FIBER OPTIC MEASUREMENT
Measure temperature directly at selected transformer winding locations with fluorescence-based fiber optic sensors. Each probe measures one defined physical point and sends the optical signal to an external monitoring instrument.
Direct PointMeasurement
ElectricalIsolation
Multi-PointMonitoringTransformer WindingMeasurementTransformer hot spot monitoring focuses on winding locations expected to experience significant thermal stress. When the relevant location is known, a fiber optic temperature probe can be installed directly at that point to measure its temperature during operation or testing.
Unlike an estimated winding temperature, direct point measurement reports the temperature at the physical location where the sensing tip is installed. It does not automatically search the winding for an unknown hottest point.
Fluorescence-based fiber optic sensing is useful for this task because the sensing point does not require metallic electrical signal wiring.
Direct point measurement provides temperature data from a selected physical winding location. This can be compared with top-oil temperature, calculated winding temperature or other transformer thermal information when evaluating operating conditions.
Direct measurement and indirect estimation serve different purposes. One reports the installed sensing point; the other represents a modeled or indicated thermal parameter.
Need a broader view of winding temperature, top-oil temperature and WTI / OTI? Transformer Temperature Monitoring
Install the fiber optic sensing tip at the selected temperature measurement location.
Excitation light travels through the optical fiber to the fluorescent sensing material.
The fluorescent response decays after excitation, and the decay behavior varies with temperature.
A compatible monitoring instrument evaluates the fluorescence decay and calculates the temperature at that sensing point.
Carries excitation and return light between the sensing point and monitoring equipment.
Excites the probe, evaluates the optical response and converts it into temperature data.
Displays available channel temperatures, alarms or trends according to the selected configuration.
Transfers temperature values to a compatible higher-level monitoring or control system.
Measures temperature at the physical point where the sensing tip is installed.
The sensing location does not require metallic electrical signal wiring.
Measurement information is transmitted optically through the sensing path.
Multiple defined locations can be measured using separate probes and compatible monitoring channels.
Sensor placement should follow the transformer thermal design or another engineering basis for identifying thermally important winding locations. A point sensor measures only the location where it is installed. Sensor placement should normally be planned before final assembly or during an appropriate manufacturing / overhaul stage when internal access is required.
Expected Thermal LocationIdentify the winding or internal region expected to experience significant thermal stress.
Winding / Phase CoverageDecide which windings, phases or comparison locations need independent measurement.
Installation SpaceConfirm that the probe structure can be positioned without interfering with the winding assembly.
Mechanical ProtectionSelect a probe construction suitable for pressure, handling and the installation environment.
Fiber RoutingPlan the optical path from the internal sensing location to the external monitoring equipment.
Number of Measurement PointsDefine how many independent sensing locations and monitoring channels are required.
Single-Point Direct MeasurementOne probe measures one defined physical location.
Useful when one selected thermal location needs direct measurement.
Requires one compatible active monitoring channel.
Multi-Point MonitoringMultiple probes measure several defined physical locations independently.
Useful for comparing winding locations, phases or thermal regions.
Requires a monitoring instrument with the corresponding active channel count.
The same point-sensing principle can also be used when a thermally important location is already known in other electrical or industrial equipment.
Direct measurement at selected winding locations identified for thermal monitoring.
Point temperature measurement at selected busbar joints and electrical connections.
Direct measurement at selected stator or winding locations.
Point temperature measurement at selected locations on test objects or high-voltage test equipment.
Point sensors and probe structures for defined transformer winding and thermal locations.
Sensors, monitoring equipment and related products for transformer temperature measurement.
Compatible instruments for optical signal evaluation and multi-channel temperature monitoring.
Feedthrough, flange and related components for transformer fiber routing and installation.
Transformer type
Winding / measurement location
Expected temperature range
Number of sensing points
Probe construction requirement
Required fiber route / length
Transformer feedthrough or installation requirement
Monitoring instrument / channel count
Display or PLC / SCADA requirement
Send the transformer type, target measurement locations, expected temperature range, number of sensing points and required monitoring interface. INNO can help match the probe, fiber route and compatible monitoring instrument.
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Transformer hot spot temperature refers to the temperature at a localized winding region expected to experience significant thermal stress. Its location depends on transformer design, winding geometry, loading and cooling conditions.
A fiber optic temperature probe is installed at a defined winding or thermal location. The sensing tip measures temperature at that physical point, while optical fiber carries the measurement signal to a compatible external monitoring instrument.
No. A point fiber optic temperature sensor measures only the physical location where it is installed. The expected hot-spot or thermally critical region must be identified before sensor placement.
Direct measurement reports the temperature at the installed sensing point. Estimated winding temperature is derived from other measured inputs and a thermal model or indication method. The two methods provide different types of thermal information and can be used together.
Sensor locations should follow the transformer thermal design or another engineering basis for identifying thermally important winding regions. The selected locations may vary by winding geometry, phase, cooling arrangement and monitoring objective.
The number depends on how many winding or thermal locations need to be measured independently. Point sensing normally uses one probe and one active monitoring channel for each physical measurement location.
Yes. Multiple probes can measure several selected locations simultaneously when connected to a compatible multi-channel monitoring instrument. Each probe remains associated with its own physical sensing point.
Yes, when the selected monitoring instrument provides a compatible industrial communication interface. The probe connects to the monitoring instrument, and the instrument provides temperature data to the higher-level monitoring or control system.
Send the transformer type, target winding locations, number of sensing points and monitoring requirements for an engineering review.