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TOL-140R Digital Transformer Oil Level Gauge
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Main oil tank for oil-filled transformers
Oil tank for on-load tap changers (OLTC)
Oil tank for New energy transformer
High protection level suitable for different installation needs indoors and outdoors.
Both high oil level and low oil level have two pairs of alarm contacts.
High precision angular displacement sensor, transmitting digital signals (compatible with 4-20mA analog signals) via RS485 to the background.
Equipped with self-diagnostic functions, and indicated through local indicator lights.
Integrated structural design, high strength, high reliability.
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Housing diamete |
140mm |
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Pointer rotation angle |
120° /270° selectable |
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Float rod swing angle |
45° (horizontally upward or downward) /120°（-60° ~+60°) |
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Repeatability |
±2.5% FS |
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Protection Class |
IP67 |
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Operating temperature |
-40℃ ~ +70℃ , relative humidity ≤ 95%RH |
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Electrical interface size |
M25×1.5 (customizable) |
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Installation method |
radial or axial |
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Power supply |
AC 220V |
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Electrical connection |
M25×1.5 waterproof cable connector Cable size: recommended 1.5mm2, Upper limit 2.5mm2 |
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Contact insulation performance |
insulation resistance: >300 MΩ Power frequency withstand voltage: 2kV, 50/60 Hz 1min |
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Contact capacity |
AC 220V /5A or DC220V 0.3A |
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Shock level |
three directions 15g |
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Dial glass |
anti-ultraviolet coating polycarbonate |
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Signal acquisition component |
linear accuracy 0.1% angle potentiometer |
24V power supply
Additional rainproof cover shell
C5 or above corrosion resistance grade
Application of Digital Oil Level Gauges in Transformer ComponentsApplication of Digital Oil Level Gauges in Transformer Accessories
Digital oil level gauges are essential intelligent monitoring devices for oil-immersed transformer conservators, revolutionizing traditional manual oil level inspection with precise digital sensing and remote data transmission capabilities. They are critical for ensuring transformer operational safety and promoting smart grid construction.
These gauges have wide-ranging application scenarios. They are indispensable for power transformers in grid substations (35kV to 1100kV), on-load tap-changer (OLTC) oil tanks, and new energy-related transformers. They also fit offshore, tropical, and other harsh environments, as well as both new installations and retrofitting of old transformers. Additionally, they work for industrial transformers in chemical plants and data centers that demand stable power supply. Unlike traditional mechanical gauges, they adapt well to extreme temperature fluctuations and humidity, maintaining accuracy in -40℃ to 85℃, which expands their applicability in remote and harsh areas.
The core roles are multi-faceted. Firstly, they offer real-time, high-precision monitoring. By eliminating mechanical wear issues, they capture tiny oil level changes accurately. Equipped with 4-20mA or RS485 signal output, they connect to SCADA systems, enabling remote real-time monitoring and historical data storage, which reduces on-site manual inspections. Secondly, they provide proactive safety protection. Pre-set high and low oil level alarms send timely alerts, preventing insulation deterioration, poor heat dissipation from low oil levels, and oil overflow from high oil levels, thus avoiding transformer damage and safety risks. Thirdly, they optimize operation and maintenance efficiency. They support condition-based maintenance by integrating with IoT systems, helping operators analyze oil level trends to spot potential leaks early, cut unnecessary maintenance costs, and enhance the reliability of the power grid.
In conclusion, digital oil level gauges are a key part of transformer digitalization. They boost equipment reliability, lower O&M costs, and lay a solid foundation for the stable operation of smart grids. Their integration with smart grid technologies further realizes intelligent diagnosis and predictive maintenance, making them an indispensable component in modern power systems.