HZGC-1210 Online Dissolved Gas Analysis (DGA) Monitoring System For Power Transformer Oil
Huazheng Electric Manufacturing (Baoding) Co., Ltd. is one of the leading manufacturers and suppliers of HZGC-1210 Online Dissolved Gas Analysis (DGA) Monitoring System For Power Transformer Oil in China. Please feel free to buy high quality equipment for sale here from our factory. Good service and reasonable price are available.
The HZGC-1210 online monitoring system oil chromatography is a specialized diagnostic instrument designed for continuous online analysis and fault diagnosis of dissolved gases in power transformer oil.
The system is suitable for a wide range of oil-immersed high-voltage equipment, including electric oil-filled transformers, electric arc furnace transformers, reactors, and other transformer types. By providing real-time monitoring of dissolved gas levels, it enables early detection of incipient faults and supports condition-based maintenance strategies.
System Overview
The HZGC-1210 system is designed based on the combined advantages of online oil chromatography monitoring systems both domestically and internationally. This foundation gives the system clear advantages in stability, reliability, and accuracy.
Core Monitoring Capabilities
The system performs online testing of the concentration and growth rate of seven key dissolved gases: H₂, CO, CO₂, CH₄, C₂H₄, C₂H₂, and C₂H₆. Its quantitative cleaning and circulatory sampling method truly reflects the state of gas dissolved in oil. Oil-gas separation is safe and reliable without any pollution, and users can choose whether or not to discharge transformer oil.
A dedicated composite chromatographic column improves the degree of separation for gas components, while an imported detector enhances sensitivity for testing hydrocarbon gases. The gas detection technique delivers high stability and precision, with an error range of ±10%.
Communication and Data Management
The system employs a mature, reliable communication mode with standard networking protocols, supporting remote data transmission. Data collection uses oversampling technology with a Δ-Σ analog-to-digital converter featuring 24-bit resolution and automatic calibration, ensuring high reliability. Diverse data display and inquiry modes provide reports and trend charts, with a historical data storage life of 10 years. An open database allows access to the electric system LAN, and the system supports the 61850 communication protocol for networking similar monitoring equipment, enabling concentrated remote diagnosis within a certain area.
Environmental and Anti-Interference Performance
The system offers strong environmental adaptability, making it widely suitable for cold, hot, high-humidity, and high-altitude areas. Its anti-interference performance is outstanding, with electromagnetic compatibility meeting GB/T17626 and IEC61000 standards. Two-level alarm settings are provided, with alert signals able to spread widely.
Modular Design and Embedded Processing
The HZGC-1210 system uses a modular design with high-performance embedded processors, making the chromatography online monitoring system more stable and reliable.
The system offers a faster analysis cycle that can be set by users themselves, with a minimum monitoring cycle of 40 to 60 minutes. A 24-hour inspection cycle is recommended. Oil-gas separation takes only 10 minutes, using special environmental adaptation technology to eliminate any change in gas distribution coefficient caused by temperature and humidity variations.
Analyzed oil samples undergo degassing and buffering techniques to remove mingled bubbles before reinjection into the transformer. The multilayer isolated reinjection oiling technique guarantees that carrier gas will not be taken into the transformer. The minimum detection limit for C₂H₂ reaches 0.1–0.5 μL/L.
The system adopts double-circuit, multi-mode thermostatic control with ±0.1 °C temperature control accuracy, and is equipped with industrial air conditioning featuring automatic constant temperature control.
The embedded processor control system is multi-functional, combining oil-gas separation, data acquisition, chromatographic analysis, concentration calculation, data alarming, and equipment condition monitoring. This design prevents cases such as data loss, greatly improving system reliability and stability. The functional interface circuit uses an opto-isolator to further improve anti-interference capability. Via Ethernet, the system realizes full-digital and remote data transmission, parameter setting, and control.
The system improves fault diagnosis by applying the modified three-ratio method, David triangle method, and cube graphic method to draw diagnosis results. Self-inspection is strengthened, with added functions for remote maintenance and alarming for equipment abnormalities.
The system adopts a 19-inch standard case with high-integrated modular design, making it easy to install and maintain with user-friendly operation. It offers wide expandability for convenient integration with other monitoring devices. The non-cylinder design saves the time and money associated with changing carrier gas every year, making after-sale maintenance much easier. Without a high-pressure vessel nearby, transformers are safer and free from potential risks.
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No. |
Parameter name |
value |
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1 |
Model |
HZGC-1210 |
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2 |
Working temperature |
-40℃～＋65℃ |
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3 |
Working humidity |
Relative humidity5～95%(interior of device shall be free from condensation and ice.) |
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4 |
Atmospheric pressure |
70kPa～110kPa |
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5 |
Power supply |
AC 220 V±10% , 50Hz |
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6 |
Monitoring content |
Monitor H2, CO, CO2, CH4, C2H4, C2H2, C2H6 in the aspects of Total hydrocarbon, relative growth rate and absolute growth value. (optional to choose the oil with few water content) |
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7 |
Analysis and diagnosis |
Conduct analysis and diagnosis for the monitoring data via improved three-ratio method, Duval's triangle and cubic graphic method. Provide the original chromatography. |
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8 |
Minimum detection period |
Range between 40 and 60min, up to user's settings. default 24 hours |
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9 |
Sampling method |
Circulatory sampling would reflect the air status in transformers precisely. |
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10 |
Oil-gas separation method |
vacuum degassing method |
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11 |
Data storage life |
≥ 10 years |
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12 |
Equipped carrier gas |
gas generator |
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13 |
Monitored gas |
Range of measurement |
Lowest detection value |
Measuring error |
|
1) |
H2 |
1 ～ 10000 µ l/l |
1µ l/l |
±10% |
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2) |
CO, CO2 |
5～ 50000 µ l/l |
5µ l/l |
±10% |
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3) |
CH4 |
0.1 ～ 20000 µ l/l |
0.1-0.5 µ l/l |
±10% |
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4) |
C2H4 |
0.1 ～ 20000µ l/l |
0.1-0.5 µ l/l |
±10% |
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5) |
C2H6 |
0.1 ～ 20000 µ l/l |
0.1 -0.5µ l/l |
±10% |
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6) |
C2H2 |
0.1 ～ 5000 µ l/l |
0.1-0.5 µ l/l |
±10% |
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7) |
H2O(optional) |
1 ～ 800 µ l/l |
1µ l/l |
±10% |
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8) |
Total hydrocarbon |
1 ～ 8000 µ l/l |
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9) |
Total air content |
0.2 ～ 15% |
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14 |
Stability(measured deviation) |
Under the same test condition, the deviation of test result shall be no more than 10%(medium concentration) |
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15 |
Electrostatic discharge immunity |
Grade 4,± 8kV－± 15kV |
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16 |
Electrical fast transient immunity |
Grade 4,± 4kV |
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17 |
Surge (shock) immunity |
Grade 4,± 4kV |
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18 |
Earthquake resistance ability：seismic wave is sine wave. Time of duration: three circle wave. Safety factor:1.67 |
Area with grade 9 seismic intensity： Ground horizontal acceleration 0.4g, ground vertical acceleration 0.2g |
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Area with grade 8 seismic intensity： Ground horizontal acceleration 0.25g, ground vertical acceleration 0.125g |
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Area with grade 7 seismic intensity： Ground horizontal acceleration 0.2g, ground vertical acceleration 0.1g |
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19 |
The temperature of storage and transportation under extreme environment |
-40 ℃ ～＋ 80 ℃ |
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20 |
Protective property of the enclosure |
Outdoor installation parts (the system and communication control unit) IP56 |
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21 |
Boundary dimension |
width 585mm × depth425mm × height 1010mm |
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22 |
Total weight |
125kg |
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23 |
Basic size |
width 700mm ×depth 380mm × height300mm |
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