GE Hydran S2 | Online Dissolved Gas Monitor for Transformers

Description

GE Hydran S2 – Online Dissolved Gas Monitor for Transformers

Product Overview

The GE Hydran S2 is an online dissolved gas-in-oil monitoring system specifically designed for power transformers and other oil-filled electrical equipment–1. Part of GE’s renowned Hydran series, this continuous monitoring solution detects key fault gases—primarily hydrogen (H₂)—dissolved in transformer insulating oil, providing early warning of developing internal faults such as partial discharge, overheating, and arcing–5.

Unlike complex laboratory chromatographs that require manual sampling and lengthy analysis, the Hydran S2 delivers real-time, on-site data with minimal maintenance overhead-5. Its compact form factor and straightforward installation make it particularly suitable for remote substations, critical industrial transformers, and wind or solar step-up stations where frequent manual oil sampling is impractical-1-6. By continuously tracking gas concentration trends, the system enables condition-based maintenance strategies that help reduce unplanned outages and extend transformer service life-11.

Technical Specifications — GE Hydran S2

Parameter	Value
Product Model	Hydran S2 (GE Energy / Qualitrol)-1
Manufacturer	GE Energy (now Qualitrol)-5
Product Type	Online Dissolved Gas-in-Oil (DGA) Monitor-
Detection Gases	Hydrogen (H₂) primary; composite fault gases including CO, CH₄-5-11
Moisture Monitoring	Relative humidity (%RH) and ppm-11
Measurement Range	0–2000 ppm (volume/volume)-
Sampling Method	Fixed port with 1-inch NPT male threads-
Communication / Protocol	RS-485 (Modbus), Ethernet, 4-20 mA analog output, dry contact relay-1-5
Power Supply	100–240 VAC or 24–48 VDC-5
Ingress Protection	IP65 / IP66 (outdoor-rated)-1-5
Mounting	Directly on transformer oil valve / circulation system-1
Dimensions (HxWxD)	Approx. 230 x 180 x 160 mm (without oil line adapter)-5
Weight	Approx. 4.5 – 5.5 kg-5
Country of Origin	Canada / USA-1-5

GE Hydran S2

Key Features and Benefits — GE Hydran S2

• Continuous On-Line Monitoring – Provides 24/7 real-time fault gas data without manual sampling, enabling immediate detection of gas concentration trends-11.
• Early Fault Warning – Detects hydrogen and other fault gases generated by thermal and electrical stress, allowing operators to identify incipient faults before they escalate into costly equipment failures–2.
• Low Maintenance Design – Built around a rugged single-sensor architecture that requires minimal calibration and servicing, reducing total cost of ownership-11.
• Flexible System Integration – Supports Modbus RS-485, Ethernet, and 4-20 mA analog outputs for seamless connection to SCADA systems, substation automation platforms, and asset management software-1-5.
• Harsh Environment Ready – IP65/IP66-rated enclosure ensures reliable operation in outdoor substation environments with exposure to dust, moisture, and temperature extremes-1.
• Networkable Architecture – Multiple Hydran units can be networked together and monitored through a single communication port, simplifying data aggregation for large transformer fleets-2.

Related Models

GE Hydran M2 : Continuous online dissolved gas and moisture monitor offering multi-gas detection capability for comprehensive transformer fault diagnosis-.

GE Hydran 201Ti : Compact, easy-to-install DGA monitor that provides IEEE C57.104-compliant data as the first line of defense against transformer faults-.

GE Hydran 201R Model i : Intelligent fault monitor with one-channel controller and HOST software, delivering composite gas readings with hourly/daily trending and alarm features-2.

GE INTELLIX MO150 : Transformer monitoring system that connects up to four Hydran S2 units and one Hydran M2 in a single network for integrated asset health assessment-.

Installation and Maintenance — GE Hydran S2

Installation of the Hydran S2 requires mounting the sensor directly onto the transformer’s oil circulation system via the standard 1.5-inch NPT port-5-1. The sensor should be positioned to ensure adequate oil flow across the gas-permeable membrane. After installation, the system typically stabilizes and delivers reliable readings within 2 to 4 hours-5.

Routine maintenance is minimal but essential for long-term accuracy. An annual functional check and calibration is recommended to compensate for any sensor drift caused by oil contamination or moisture-5-6. Regular inspection of oil line seals prevents leakage or air ingress that could skew measurement data-5. Under normal operating conditions, the sensor has a design life of 3 to 5 years, which can be extended through proper maintenance practices-5.

For system integration, the Hydran S2 should be connected to the substation’s SCADA or automation network to enable remote alarming, data logging, and trend analysis-1. Always consult the manufacturer’s manual for detailed installation procedures and safety precautions before commissioning.