Transformer Gas Monitoring System
One of the most important and reliable methods for maintaining transformers is analyzing the gases in the insulating oil.
The transformer dissolved gas analyzer (HYDROCAL Series) requires no consumables after installation, eliminating the costs associated with purchasing or maintaining them.
By analyzing the dissolved gases in the insulating oil online and providing the results to the user, it enables early diagnosis of transformer risks and helps prevent unexpected failures in advance.
| Communication Interfaces (Standard) |
RS 485 ETHERNET 10/100 Mbit/s – copper wired / RJ45, fiber optical / SC Duplex |
|---|---|
| Communication Interfaces (Optional) |
On-board GSM, Analog, DNP3.0, IEC 61850 Modem |
| Communication Protocols |
Proprietary Protocol – HydroComm MODBUS TCP, MODBUS Serial RTU or ASCII DNP3.0 Serial, IEC 61850 (optional) |
| Outputs (Standard) |
8 × Analog DC current outputs 0/4 … 20 mA 8 × Digital relay outputs (REL1: System alarm / REL2 … REL8: freely assignable) |
| Inputs and Outputs (Optional) |
6 × Analog AC current 0/4 … 20 mA / voltage 0 … 80 V inputs (configurable by jumpers) 4 × Analog DC current 0/4 … 20 mA inputs (freely assignable) 5 × Digital optocoupler outputs (freely assignable) |
Features
- Individual analysis of 9 gases
- Self-calibration using near-infrared sensors
- - No maintenance cost
- Equipped with transformer monitoring functions
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- Temperature (hot-spot, aging rate, loss-of-life)
- Bushing monitoring (optional)
- Can be installed while the transformer is in operation
- Provides various communication interfaces
Measurement Cycle
- Zero Measurement
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- Self-calibration
- Self-diagnosis of the equipment for measurement (temperature, air pressure, humidity, etc. using separate sensors)
- Sampling
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- Oil sampling using the transformer's static hydraulic pressure
- Transfer to the extraction chamber (operation of membrane pump, brushless DC motor)
- Equipment operation verification system (injection status check, flow meter, timer sensor)
- Gas Extraction
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- Based on the headspace principle
- Application of Henry’s Law (the amount of gas dissolved in a liquid is proportional to the partial pressure of that gas)
- Temperature and pressure control for high repeatability
- Equilibrium between gas-in-oil and gas-in-gas
- Miniaturized design, patented register oil extraction method (EP1 950 560 B1)
- Gas Analysis
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1)Analysis of CO, CO₂, and hydrocarbons using near-infrared (NIR) method
2)Hydrogen (H₂) analysis using precision semiconductor sensors
3)Moisture-in-oil analysis
- Thin-film capacitive moisture sensor and oil temperature sensor used
4)Near-infrared gas sensor units #1 & #2
- Unit #1: Measurement of CO, C₂H₂, and C₂H₄
- Unit #2: Measurement of CO₂, C₂H₆, and CH₄
- Precision semiconductor: Measurement of H₂ and ZnO₂