on Line Gas Chromatography Transformer Oil Dga Dissolved Gas Analyzer
I. System overview
Exact understanding of the running status of the transformer is the key to maintain the safe operation of the power system.
If local overheating or partial discharge is present in the transformer, the insulating oil or solid insulator in the trouble location will release small molecules hydrocarbon gases such as CH4, C2H6, C2H4, C2H2 and other gases such as H2, CO, CO2. Both of the concentration of every gas in insulating oil and the total concentration of inflammable gas in oil (TCG) can be used as indicators to diagnose the internal faults of the transformer.
Transformer Oil On-line Monitoring System is a new transformer oil chromatogram on-line monitoring product. Our company researches and develops the product by taking International Electrotechnical Commission (IEC) Standard and National Standard of Transformer Oil Monitoring of China Electric Power Industry (GB) as test research and development basis strictly, introducing advanced detection technology and high-precision detection components from abroad and absorbing the field operating experience of on-line chromatogram monitoring system for gas in transformer oil at home and abroad.
Transformer Oil On-line Monitoring System adopts oil gas degassing technology that combines vacuum and ultrasound, uses the international newest high efficiency compound chromatographic column and high-precision sensor to accurately analyze seven gases with fault features including hydrogen (H2), carbon monoxide (CO), methane (CH4), ethane C2H6), ethylene (C2H4), acetylene (C2H2) and carbon dioxide (CO2) and to assist in realizing on-line analysis of micro-water in oil.
Transformer fault information can be captured promptly by using Transformer Oil On-line Monitoring System to scientifically guide the operation and maintenance of the equipment.
II.System constitution:
Transformer Oil On-line Monitoring System is mainly composed of oil-gas separator, cold trap, carrier gas regulation and control system, air cleaning and drying system, temperature control system, fault-characteristics-gas-in-oil chromatography detection unit, fault diagnosis and data management software composed of industrial personal computer, communication network, and data remote control and access software.
III. Technical indexes of system:
| Item |
Content |
| Detection principle |
Detect H2, CO, CH4, C2H6, C2H2, C2H4 or CO2, O2, where micro-water can be detected. |
| Degassing method |
Vacuum and ultrasound degassing |
| Separating method |
Special single chromatographic column |
| Detection method |
Special single gas sensor |
| Sampling methods |
Digital automatic quantification sampling |
| Temperature control |
Dual-loop thermostatic control |
| Data collection |
Adjustable circuit design, automatic peak capturing and appearance section gain |
| communication mode |
RS485,TCP/IP,GPRS |
| Network protocol |
Support TCP/IP network protocol, support remote monitoring and remote maintenance |
| 'Display mode |
Report/trend chart/incremental analysis, data can be incorporated in user monitoring network |
| Display content |
H2,CO,CO2,CH4,C2H6,C2H2,C2H4,O2,TCG |
| Alarm mode |
Any set concentration, incremental alarm value; audible and visual alarm; spot remote transmission of alarm signal |
| analytical cycle |
System default 24 hours/times, 2 hours to the minimum, set by user |
| Data storage |
20 years |
| Temperature control precision |
±0.1ºC |
| Environment temperature |
-40ºC~+85ºC |
| Relative humidity |
5-95% No condensation |
| Maximum daily temperature difference |
30ºC |
| Sunlight intensity |
1kW/m2 (wind speed 0.5m/s) |
| Pollution level |
External insulation creepage distance 25mm/kv |
| Ice cover thickness |
20mm (when wind speed is not more than 15m/s) |
| Working power supply |
Alternating current 220V±10%,50Hz |
| Carrier gas |
99.999% of nitrogen gas, pressure 0.12-0.25Mpa |
| Installation size |
800(length)×550(width)×1400(height)mm |
| Anti-vibration |
5-17Hz,0.1" bimodal shift; 17-640Hz, 1.5G peak-to-peak acceleration |
| Anti-impact |
Acceleration: 10G peak-to-peak |
VI. Case on-site
){kind=link}
){kind=link}