Benefits and Intelligence of Transformer Gas Relays

Date: July 13, 2025 09:05:33

QJ1-80

transformersGas Relay(Gas Relay) can be summarized in the following five core benefits:

1. High sensitivity and early warning of faults

  • detectableSlight turn-to-turn short circuitThe faults such as localized overheating of the iron core, deterioration of the insulating oil, etc. These faults have small currents and are often not recognized by the differential protection.
  • When there is a slow buildup of gas in the oil (light gas) or a sudden surge of oil flow (heavy gas), it can act quickly to prevent the failure from expanding.

2. Simple structure and high reliability

  • Mechanical float/baffle structure, no complex electronic components, strong anti-electromagnetic interference, suitable for harsh environments (e.g. high humidity, strong vibration).
  • High-end models passHelium Leak TestThe seals have a life span of decades.

3. Comprehensive scope of protection

  • overwriteAll faults inside the tank: Multi-phase short circuit, turn-to-turn short circuit, core failure, oil level drop, poor tap changer contact, etc.
  • rightOil leakage or air intakeIt can also provide timely alarms to prevent dry burning or insulation breakdown of the transformer.

4. Easy maintenance and low cost

  • Regular models do not require periodic calibration, only inspection of the oil level in the observation window and testing of the mechanical buttons.
  • The digitalized version allows remote monitoring and reduces the cost of manual inspections.

5. Intelligent upgrade compatibility

  • New electronic relays (e.g. CGC Smart) support theReal-time gas volume monitoringwhich algorithmically distinguishes between normal and faulty gases.Avoid false alarmsThe
  • It can be integrated into the smart grid system to realize data transmission and fault diagnosis.

Typical Application Scenarios

take Recommended Advantages
110kV Substation Mechanical QJ-80, economical and reliable
Extra-high voltage/nuclear power projects Reinhausen MSAFE®, Helium Leak Detection + Remote Monitoring
Offshore wind power/highly corrosive environments IP65 Protection Rating Model
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Intelligent gas relay through real-time monitoring + intelligent diagnosis + accurate warning "triple mechanism, significantly improve the safety performance of transformer operation, specifically reflected in the following five aspects:

1. Real-time gas volume monitoring, eliminating "false light gas alarms".

The traditional gas relay cannot read the volume of gas in the gas collecting chamber in real time, which makes it difficult to distinguish the light gas alarm from the real one and easy to misjudge the shutdown.
smart upgrade (computing)::
  • adoptionCapacitive Level SensorsmaybeDouble Float StructureThe oil level height is measured in real time and the gas volume change is converted with an error of <±5%, which is better than the requirement of the national standard.
  • case (law)The intelligent relay developed by CGNPC has successfully identified non-fault false alarms (e.g. float jamming) through the "two-in-one" module of liquid level + hydrogen, thus avoiding the accidental shutdown of a main transformer.

2. On-line hydrogen detection for "early warning" of failures

Hydrogen is the first gas to be characterized in the event of an internal discharge or overheating fault in a transformer.
smart upgrade (computing)::
  • internally installedPd/Ni Alloy Hydrogen SensorThe Hydrogen Mutagen is capable of detecting hydrogen mutations of ≥10,000 mL/L, faster than manual sampling.dozens of timesThe company's products are designed to detect insulation breakdowns, local discharges, and other potential hazards in advance.
  • experimental verification: In the arc discharge model, the system triggers an early warning as soon as the hydrogen volume fraction jumps from 0 to 100,000 mL/L, much earlier than conventional protection actions.

3. Intelligent diagnostic logic to reduce human error in judgment

Multi-physics fusion judgment::
  • combiningGas volume change rate,hydrogen concentration,Light gas contact signalThree-dimensional data, with built-in algorithms (e.g., decision trees, fuzzy logic) to determine the authenticity of faults and output risk alerts.
  • effectThe system gives a clear conclusion of "fault/false alarm/requires further inspection" directly, reducing the risk of human misjudgment.

 4. Remote monitoring and data closure to improve emergency response speed

  • communications interface: Support 4-20mA or Modbus TCP/IP protocol, access to substation automation system, realize theRemote real-time data uploadThe
  • case (law): Tests have shown that intelligent gas relays can reduce fault response times from an average of4 hours (manual inspection) reduced to less than 30 secondsThe

5. Structural safety upgrades to prevent secondary accidents

  • Installation without openings: The sensor module utilizes the existing exhaust valves or observation holes.zero risk of leakageIt is suitable for high-risk scenarios such as nuclear power and offshore wind power.
  • environmental adaptation: Operating temperature -40℃~+80℃, resistant to 2bar pressure and vacuum, ensuring no misoperation or refusal to operate under extreme conditions.

Summary: Quantitative Comparison of Safety Improvements

tabular

make a copy of
norm Conventional Relay Intelligent Gas Relay
False Alarm Rate 15%~30% <2% (based on CGN data)
Fault discovery time Hourly (manual) Seconds (online monitoring)
Hydrogen Detection Sensitivity not have 10,000 mL/L
Remote monitoring capability not have Support SCADA/Cloud Platform
Installation risk Requires opening, possible oil leakage Zero openings, no leaks

 

Gas relays are known for theirHigh sensitivity, low cost, full coverageThe characteristics of the oil-immersed transformer has become an indispensable "non-electricity protection" core equipment, with differential protection to form a complete fault defense system.

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