Power equipment online monitoring system

I. Multi-type equipment monitoring, comprehensive coverage of the power system

(i)Transformer online monitoring

1. Transformer oil chromatography online monitoring system: The system continuously monitors the composition and content of dissolved gases in transformer oil. By analyzing the changes of hydrogen, methane, ethylene and other characteristic gases in the oil, it is able to detect local overheating, discharge and other hidden faults inside the transformer in a timely manner. When the gas content or gas production rate is abnormal, the system will issue an early warning, providing a basis for operation and maintenance personnel to troubleshoot in advance.
2. Transformer oil spectroscopy online monitoring system: Utilizes spectral analysis technology to accurately detect metal elements, moisture and other indicators in transformer oil. By monitoring changes in the content of metal elements in the oil, the wear and tear of the transformer's internal windings, cores and other components can be judged; the monitoring of moisture content can assess the insulating properties of the oil, preventing insulation breakdown accidents caused by excessive moisture in the oil.
3. Online gas monitoring system for transformer oil with few components: Focuses on the monitoring of specific low-component gases in transformer oil, such as certain rare gases or low concentrations of characteristic gases. This targeted monitoring enables more precise diagnosis of specific types of faults and improves the accuracy of fault identification, especially in the detection of some early, minor faults with unique advantages.
4. Hydrogen online monitoring system in transformer oil: Focuses on monitoring changes in the hydrogen content of transformer oil. As hydrogen will be generated in large quantities at the early stage of internal transformer faults (such as local overheating and discharge), the system can realize early warning of potential faults inside the transformer through real-time monitoring of hydrogen content, thus gaining time for timely treatment of faults.
5. Online monitoring system for transformer core clamps: Real-time monitoring of parameters such as ground current in transformer core clamps. Iron core is an important part of the transformer, if the iron core has a multi-point grounding fault, it will generate a loop current, resulting in localized overheating of the iron core, and even damage to the equipment. The system can detect the iron core grounding abnormality in time and prevent further expansion of the iron core fault.
6. Transformer core clamps online monitoring and current limiting device: On the basis of monitoring the running status of the core clamp, it also has the function of current limiting. When monitoring the core clamps grounding current abnormally increased, the current limiting device will act in time to limit the size of the current, to avoid more serious faults caused by excessive current, to further protect the safe operation of the transformer.

(ii)Switchgear online monitoring

• Partial Discharge Monitoring: Monitor the local discharge signal inside the switchgear cabinet through UHF, ultrasonic and other technologies. Local discharge is an important precursor of switchgear insulation failure, timely detection of local discharge can effectively prevent insulation breakdown accidents.
• Node temperature monitoring: Infrared temperature measurement, wireless temperature measurement and other technologies are used to monitor in real time the temperatures of key nodes such as busbar connectors, circuit breaker contacts, cable terminals and so on in the switchgear cabinet. Abnormal rise in node temperature is usually caused by poor contact, etc. Timely detection can avoid equipment damage or even fire accidents caused by overheating.
• Vacuum monitoring: For vacuum circuit breakers in switchgear, the vacuum level of their interrupting chambers is monitored. A drop in vacuum will affect the interrupting performance of the circuit breaker, which may lead to the failure of the circuit breaker in breaking the fault current and lead to serious consequences.
• Motion Characteristics Monitoring: Monitor the action time, opening and closing speed and other action characteristics of switchgear such as circuit breakers in the switchgear cabinet, assess the mechanical performance of the switchgear, and detect problems such as mechanism jamming and spring fatigue in a timely manner.

(iii)Online cable monitoring

• Sheath circulation monitoring: Monitor the size of the ring current of the cable sheath. Excessive sheath ring current will not only increase the loss of the cable, but also may affect the insulation performance and service life of the cable, through the monitoring of the sheath can be found in a timely manner, such as sheath grounding and other abnormalities.
• Cable Tunnel Environmental Monitoring: Monitoring of environmental parameters such as temperature, humidity and harmful gas concentration in cable tunnels. Cable tunnels are harsh environments, where abnormal temperature and humidity or the accumulation of harmful gases may accelerate the aging of cables and even cause accidents such as fires.
• Connector Discharge Monitoring: Cable joints are the weak links of cable lines, and monitoring the partial discharge at the joints can detect insulation defects of the joints in time and prevent joint failures from triggering power outages of cable lines.
• Precise location of cable faultsWhen a cable fault occurs, the system can accurately locate the fault point through the relevant technology, greatly shortening the fault finding and repair time, and improving the reliability of power supply.

(iv)GIS online monitoring

• Gas leakage monitoring: Monitor the leakage of sulfur hexafluoride (SF₆) gas inside the GIS equipment. SF₆ gas is the insulation and arc extinguishing medium of the GIS equipment, and the leakage of the gas will lead to the degradation of the equipment's insulating performance, which will affect the normal operation of the equipment.
• Microwater density monitoring: Monitor the water content in the SF₆ gas inside the GIS equipment. Excessive micro-water content reduces the insulating properties of SF₆ gas and can also cause condensation inside the equipment, leading to insulation faults.
• Partial Discharge Monitoring: Monitor partial discharges inside the GIS equipment to detect insulation defects, conductive particles and other problems inside the equipment in time to guarantee the insulation safety of the GIS equipment.
• Motion Characteristics Monitoring: Monitor the operating characteristics of switchgear, such as circuit breakers, within GIS equipment to assess their mechanical performance and detect mechanism failures in a timely manner.

II. Advanced technology empowerment to ensure accurate and efficient monitoring

(i) Sensor technology

(ii) Data transmission and processing technology

Third, intelligent operation and maintenance management, improve the level of power grid operation and maintenance

(i) Remote diagnostics and cloud platforms

(ii) Mobile operations and maintenance