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Modular Switchgear Monitoring (MSM)

Condition monitoring for high-voltage switchgears

Modular Switchgear Monitoring (MSM) is an add-on system to supervise, manage and analyze performance of high-voltage switchgear like dead tank breakers (DTB), live tank breakers (LTB), gas-insulated switchgear (GIS) and Plug and Switch System (PASS) hybrid switchgear. The system operates independently of existing control and protection devices and can be installed in new substations or retrofitted in existing installations. By continuously monitoring critical parameters, MSM provides the base layer for a predictive maintenance strategy for the installation.The system is compliant with IEC 61850 and DNP 3.0 and it is provided with a web interface where all monitored data are accessible.


Based on the monitoring application, MSM is offered in 2 versions :

  • MSM I is designed for SF6 gas monitoring allowing early detection and prevention of critical gas leakages in high-voltage switchgear, enabling to reduce SFgas emissions 
  • MSM II enables circuit-breaker monitoring in addition to SFgas monitoring, for improved operational reliability and performance of the circuit-breakers

Why Hitachi Energy?


  • Improved reliability with reduction in unplanned downtime
  • Optimized predictive and proactive maintenance by early warnings
  • Provides adequate time for maintenance planning with low chances of failure
  • Greater diagnostic capability in case of failure through the recorded data, reducing time to repair
  • Improved environmental/ regulatory compliance with reduced SF6 leakages
  • Software independent visualization

Product overview

Category Features MSM I  MSM II 
Dielectric  Gas pressure SF6 SF6
  Gas leak rate SF6 SF6
Mechanical Travel curve - Calculated
  Mechanism timing - Yes
  Contact speed - Calculated
  Coil current analysis - Yes
Wear Operations counter (Fault)  - Yes
  Contact wear - Yes
Accessories Motor/ pump run-time - Yes
  Motor/ pump (unforced) starts - Yes
  Motor current (curve/ peak) - Yes
  Device self-supervision Yes Yes

Get to know more

MSM System 
Parameter Specification
Number of modules per MSM Stack (for SF6 monitoring) Up to 10
Operating ambient temperature of LCC -40°C to +70°C
Operating temperature LCD (clearly legible) -5°C to +50°C
Protection class IP 20
Input voltage range of power supply 80 to 370 VDC, 85 to 277 VAC 
LED Device status indication
Control Communication Module (CCM) 
Dimensions W / H / D 79 x 99 x 113 mm
Nominal supply voltage 24 VDC, +/-10%
Module power consumption < 6 W
Isolation voltage Max. 2 kVAC
Communication Ethernet interface RJ45, 10/100 Mbit/s
Communication protocols IEC 61850-8-1 (MMS), DNP3 ,SNTP, SFTP, HTTP 
Supervision, Binary Output 1 Alarm signal
Supervision, Binary Output 2 Watchdog
Analog Input Module (AIM) 
Dimensions W / H / D 56 x 99 x 113 mm
Module power consumption < 3 W
Integrated power supply for sensors 12 VDC , 200 mA
Isolation voltage Max. 2 kVAC
Analog inputs (configurable) 8 channels ,0 to 20 mA/ 4 to 20 mA
Accuracy 1% full scale
Binary Input Module (BIM)  
Dimensions W / H / D 56 × 99 × 113 mm
Module power consumption < 0.1 W
Binary inputs (configurable) 6 channels 48 to 250 VDC/ 48 to 230 VAC 
Product safety IEC 60255-27
Electromagnetic compatibility IEC 60255-26, Zone A
Isolation voltage Max. 2 kVAC
Isolation resistance  100 MOhm
Fast Analog Input Module (FAIM) 
Dimensions W / H / D 56 x 99 x 113 mm
Analog inputs 4 x ±5 V / 0 to 20 mA
Power outputs 24 V, ±15 V, ±5 V
Module power consumption < 15 W
Product safety IEC 60255-27
Electromagnetic compatibility IEC 60255-26, Zone A
Isolation voltage Max. 2 kVAC
Isolation resistance  100 MOhm

Highly stable SF6 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 balancing and strategies to reduce SF6 emissions by leakage. 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 detection of SF6 leakages and minimization SF6 emissions
  • Timely preparation of counter measures
  • Get a detailed overview of banked SF6 in the equipment and simplify preparation of SF6 balance sheets
  • Reduce inspection work and maintenance costs

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 records 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 while operation of circuit-breaker
  • Fault Operation Counter – informative feature to indicate the ageing of circuit-breaker
  • Contact wear calculation to compute contact erosion of circuit-breaker used to plan maintenance for interrupter if excessive wear is plausible
  • Records motor/ pump runtime to identify wear and friction in the energy charging system on the operating mechanism
  • Records number of unforced motor/ pump starts leakages in hydraulic system on the operating mechanism
  • Monitors motor current curve and peak to identify damaged spring charging motor on the operating mechanism
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