Modular Switchgear Monitoring (MSM)

Highly stable SF₆ and gas density sensors are used to continuously monitor the integrity of the gas compartments and identify gas losses at an early stage. Advanced algorithms correct measured data for daily and seasonal variation and provide the leakage rate as well as the estimated time until counter measures are taken. Thus, gas losses which may become critical can be handled in a planned manner. In addition, the monitoring data provides a basis for SF₆ and gas balancing and strategies to reduce SF₆ and gas emissions by leakage repair. Starting from one gas compartment, the system can be seamlessly up-scaled to monitor several hundred gas compartments in large GIS installations.
 

• SF₆ leakages make up 40–50% of “minor failure frequency” and up to 90% of GIS maintenance
• Early detect SF₆ leakages and thus minimize SF₆ emissions
• Have more time to prepare counter measures
• Get a detailed overview of banked SF₆ in the equipment and simplify preparation of SF₆ balance sheets
• Reduce inspection work and maintenance cost

MSM gas monitoring feature is compatible with EconiQ^TM portfolio and other gas mixtures.

Non-invasive hall sensors and signals from auxiliary switches are used to monitor key parameters of the circuit breaker. Measured signals include phase current during operation, trip and close coil current, and motor current. Monitored parameters are categorized in mechanical performance, wear, as well as accessories. Measured curves are stored as comtrade files on the system, allowing further analysis. All features of MSM-I are included in this application as well.

MSM-II provides:

• Record of parameters regarding circuit breaker operations (timing, speed and travel curve) that identify any performance deterioration

• Coil Current Analysis – informative feature to indicate health status of the operating mechanism and its operating condition 

• Phase Current Monitoring – informative feature to record current waveform during circuit breaker operation

• Fault Operation Counter – informative feature to indicate the ageing of the circuit breaker

• Contact wear calculation computes contact erosion of circuit breaker and helps the user to plan the maintenance incase of excessive wear and tear of the interrupter

• Record motor/ pump runtime to identify wear and friction in the energy charging system of the operating mechanism

• Record of number of unforced motor/ pump starts symptom of leakages in hydraulic system of the operating mechanism

• Motor current curve and peak monitoring to identify damaged spring charging motor of the operating mechanism