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Help CenterGE HYDRAN 201TI Dissolved Gas Monitoring System for Transformer Oil
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GE HYDRAN 201Ti is a compact on-line dissolved gas analysis (DGA) monitoring transmitter specially designed for early fault warning of power transformers. Adopting fuel cell sensing technology and dynamic oil sampling technology, it can monitor fault characteristic gases in insulating oil in real time, serving as a key on-line monitoring device to ensure reliable operation of the power grid and prevent unplanned outages.
1. Positioning and System Relationship
System Affiliation
It belongs to the GE HYDRAN series of on-line transformer monitoring products and serves as the core intelligent transmitter unit of the HYDRAN 201i system. As a basic DGA monitoring device, it is mainly targeted at small and medium-sized power transformers with low risk levels, providing cost-effective and efficient early fault warning. It can operate independently to output local alarms and analog signals, and can also be networked with HYDRAN 201Ci series controllers (H201Ci-1/4/C), SCADA systems, and substation automation systems via the RS-485 interface to form a complete transformer condition monitoring and management system.
Core Role
Positioned as a “Fault Gas Sentinel” in power equipment condition monitoring systems, its core responsibilities include:
Early fault warning: Continuously monitors dissolved fault characteristic gases (primarily hydrogen H₂) in transformer oil on-line, issuing alarms at the incipient stage of faults to support maintenance decision-making.
Condition data acquisition: Measures and outputs gas concentration data (ppm) in real time, reflecting latent faults inside the transformer such as overheating, discharge, and insulation aging.
Stable and reliable operation: Industrial-grade design with no pumps or moving parts, adapted to the harsh outdoor operating environment of transformers to ensure long-term continuous monitoring.
Remote data transmission: Uploads gas concentration, alarm status, and equipment diagnostic information to back-end systems through standard industrial communication interfaces to enable remote monitoring.
Self-diagnosis and maintenance: Built-in comprehensive self-diagnostic functions continuously monitor sensor, communication, and hardware status, and proactively report system faults.
Mounting Position
Mounting method: Cylindrical integrated design, directly mounted on a single valve of the transformer tank or oil pipeline via a 1.5-inch (38mm) NPT brass fitting, with no need for additional sampling pumps, tubing, or brackets.
Physical dimensions: Cylindrical enclosure, approximately 152mm in diameter and 229mm in length, with a compact structure.
Interface layout: Top-mounted backlit LCD display and membrane keypad for local configuration and data viewing; bottom terminals for power supply, alarm relays, analog output, and communication interfaces.
Operating environment: Protection rating NEMA 4X / IP66, suitable for harsh outdoor environments. Operating temperature: -20°C ~ +60°C.
System Architecture
Typical application architecture:Power transformer → GE HYDRAN 201Ti (gas monitoring transmitter) → Upper-level system.
Standalone mode: The 201Ti connects directly to the transformer valve, displays data locally, and outputs alarms via 4-20mA analog signals and relay contacts, suitable for simple monitoring scenarios.
System mode: Multiple 201Ti units connect to a HYDRAN 201Ci controller via the RS-485 bus, which then links to a SCADA/substation system or uses GE Perception software for data management, trend analysis, and fault diagnosis.
Operating principle: The device continuously extracts gas from oil through a vacuum-resistant permeable membrane; the sensor detects gas concentration and converts it into an electrical signal. After processing by the microprocessor, the concentration value (ppm, H₂ equivalent) is shown on the LCD, while data is output through analog and digital interfaces. Local and remote alarms are triggered when concentration or rate-of-change exceeds thresholds.
2. Functions and Technical Features
1. Precise Gas Monitoring Capability
Dual sensor options:
Composite gas sensor (standard): 100% response to hydrogen (H₂), with high sensitivity to carbon monoxide (CO), acetylene (C₂H₂), and ethylene (C₂H₄), fully reflecting overheating and discharge faults.
Hydrogen-only sensor: Focuses on hydrogen monitoring, suitable for scenarios dominated by overheating fault detection.
Measuring range: 0 ~ 2000 ppm (H₂ equivalent), other ranges customizable.
Measuring accuracy: ±10% of reading ±25 ppm (0–2000 ppm range).
Response time: T90 (step change)
Sampling technology: Dynamic Oil Sampling, requiring no oil pump; efficient and continuous gas exchange achieved by direct single-valve mounting.
2. Rich Communication and Output Capabilities
Analog output: 1 isolated 4–20mA DC output corresponding to the gas concentration range.
Relay output: 3 programmable dry contacts (Gas High, Gas High-High, System Fail).
Digital communication:
Standard: Isolated RS-485 interface supporting Modbus RTU protocol.
Local interface: USB (replacing traditional RS-232) for on-site PC connection, configuration, and data download.
Data logging: Built-in non-volatile memory storing up to 1 year of historical data and event records.
3. Industrial-Grade Reliability
Robust design: NEMA 4X / IP66 protection, corrosion-resistant and shockproof, suitable for harsh outdoor and substation environments.
No wearable parts: No pumps, fans, or other moving parts, resulting in extremely low failure rate and minimal maintenance.
Electromagnetic compatibility: Compliant with IEC 61000 series standards, stable operation in strong electromagnetic interference environments.
Sensor life: Long-life fuel cell sensor with service life exceeding 5 years under normal operating conditions.
Self-diagnosis: Full-system self-test continuously monitors sensor, communication, power, and hardware status, triggering a “System Fail” alarm upon abnormality.
4. Easy Operation and Maintenance
Local HMI: Backlit LCD display and membrane keypad for on-site data viewing, parameter setting, and alarm checking.
No on-site calibration required: Precisely calibrated at the factory, with no frequent calibration needed after on-site installation.
Software compatibility: Supports GE Perception professional analysis software for data trend analysis, fault diagnosis, and report generation.
5. Flexible Expansion and Compatibility
Multi-device networking: A single controller can connect and manage up to 32 units of 201Ti transmitters.
Open protocol: Supports standard Modbus protocol for seamless integration with various third-party SCADA and PLC systems.
Wide adaptability: Suitable for various oil-immersed power transformers and reactors using mineral insulating oil.
3. Technical Specifications
Product Identification
Model: GE HYDRAN 201Ti (H201Ti)
Brand: GE Vernova (Grid Solutions)
Type: Intelligent dissolved gas-in-oil monitoring transmitter
Enclosure: NEMA 4X / IP66, stainless steel
Mounting interface: 1.5-inch NPT male thread
Core Parameters
Measuring principle: Gas permeable membrane + fuel cell (catalytic combustion) sensor
Measured gases: H₂ (100%), CO (~15%), C₂H₂ (~8%), C₂H₄ (~1.5%)
Measuring range: 0 ~ 2000 ppm (H₂ equivalent)
Accuracy: ±10% of reading ±25 ppm
Response time:
Power supply: 100–120V AC or 200–240V AC, 50/60Hz, max. 475 VA
Analog output: 4–20mA DC, isolated, max. load 1000 Ω
Communication interface: RS-485 (Modbus RTU), USB (local configuration)
Operating temperature: -20°C ~ +60°C
Storage temperature: -40°C ~ +85°C
Relative humidity: 5% ~ 95% RH (non-condensing)
4. Compatible Systems and Supporting Components
Compatible Host Systems
Dedicated controllers: GE HYDRAN 201Ci-1, 201Ci-4, 201Ci-C
Monitoring software: GE Perception Condition Monitoring and Diagnostic Software
Third-party systems: Modbus-compliant SCADA systems, integrated substation automation systems, PLCs
Required Supporting Components
Mounting valve: 1.5-inch full-bore gate valve or ball valve for transformers
Mounting fitting: Special brass NPT adapter
Power cable: AC power cable matching the voltage rating
Communication cable: Shielded twisted-pair cable (for RS-485 bus)
Signal cable: Shielded cable (for 4–20mA and relay outputs)
Optional Accessories
HYDRAN 201Ci series controller: For centralized management of multiple devices
Surge protector: For strong electromagnetic environments in substations to protect communication and power circuits
Dedicated configuration cable: USB-to-device connection cable
Spare sensor module: For later maintenance and replacement
5. Application Scenarios
Power transmission and transformation: On-line DGA monitoring for medium and small power transformers in the power grid, providing early fault warning and optimizing maintenance schedules.
Industrial enterprises: Transformer monitoring in captive power plants / substations in petrochemical, metallurgical, manufacturing, and other industries to ensure continuous power supply for production.
New energy grid integration: Condition monitoring of step-up transformers in wind farms and photovoltaic power stations.
Commercial buildings: Reliability assurance for key distribution transformers in large commercial centers and data centers.
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