Description
Product Overview
The HYDRAN 201Ti is a compact continuous dissolved gas analysis (DGA) online monitor for oil-immersed power transformers, manufactured by GE Vernova. It adopts fuel cell sensing technology to deliver the well-known Hydran composite gas value, serving as an early warning device for incipient transformer faults. It can be mounted directly onto a single transformer oil valve, utilizing dynamic oil sampling without pumps or extra piping, widely used as the first line of asset protection for power transformers. It complies with IEEE C57.104 standard for transformer fault gas evaluationGE Vernova.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | GE Vernova |
| Model | HYDRAN 201Ti Mark IV |
| Device Type | Transformer Online DGA Monitor |
| Sensing Technology | Fuel cell sensor with gas permeable membrane |
| Measured Gas Response | 100% Hydrogen (H₂); sensitive to CO, C₂H₂, C₂H₄ |
| Measurement Range | 25 ~ 2000 ppm H₂ equivalent |
| Accuracy | ±10% of reading ±25 ppm |
| Response Time (90% step change) | 10 minutes |
| Enclosure Rating | NEMA 4X / IP66 |
| Ambient Operating Temp | -40°C ~ +55°C |
| Local Display | Backlit LCD, 2 lines × 16 characters + keypad |
| Communication | RS-485 (isolated 2000Vac); Modbus / Hydran protocol; USB Type-B local service port |
| Analog Output | Isolated 4-20mA |
| Alarm Relays | 3 × SPDT type-C dry contacts, 3A @250Vac / 3A @30Vdc |
| Data Logging | Store up to 1 year of measurement & event history |
| Dimensions | 178 mm diameter × 180 mm length |
| Installation | Direct mount to transformer drain/sample valve |
Key Features
- Two sensor options available: composite gas sensor or hydrogen-only sensor
- Vacuum-resistant gas extraction membrane, no moving internal pumps
- Full built-in self-test and continuous system diagnostics
- Dual alarm trigger modes: absolute gas concentration or gas rate-of-change
- Three configurable alarms: Gas Alert (Hi), Gas Alarm (HiHi), Service Alarm
- Manual oil sampling port for laboratory reference DGA comparison
- No routine field calibration required after factory calibration
- Compact cylindrical housing suitable for outdoor substation environments
Installation & Test Notes
- Mount the unit securely on the transformer sampling valve; confirm valve integrity before oil connection.
- Complete electrical wiring for RS-485 communication, 4-20mA analog output and alarm relay circuits.
- Connect USB to laptop for configuration via GE Perception software, set gas alarm thresholds.
- Power up the monitor and run self-diagnostics; verify LCD readings and communication to SCADA.
- Perform alarm relay function test and trend logging validation during commissioning.
- Check membrane and sensor status periodically, follow recommended maintenance cycle.
Application
Online health monitoring for medium and large oil-filled power transformers in power generation, transmission and distribution substations. It detects early insulation degradation, arcing and overheating faults, reducing unplanned outage risk and optimizing transformer maintenance schedules.
FAQ
Q: What gases can HYDRAN 201Ti detect? A: The composite sensor responds primarily to Hydrogen, plus sensitivity to Carbon Monoxide, Acetylene and Ethylene, which cover major transformer fault modes.
Q: Does this unit require a pump for oil sampling? A: No, it uses dynamic oil sampling and membrane gas extraction with no internal pump, simplifying installation and lowering failure points.
Q: What communication protocols are supported? A: RS-485 supports both Modbus RTU and native Hydran protocol; USB port is for local configuration and data download only.
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