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Modular Switchgear Monitoring (MSM)

Condition monitoring for high-voltage switchgear

Modular Switchgear Monitoring (MSM) is used to supervise, manage and analyze performance of all type of high-voltage switchgear in new installations as well as a retrofit solution in existing high-voltage assets. 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 with additional options:

  • MSM-I is designed for SF6 and gas monitoring allowing early detection and prevention of critical gas leakages in high-voltage switchgear, enabling to reduce gas emissions 
  • MSM-II enables circuit-breaker monitoring in addition to gas monitoring, for improved operational reliability and performance of the circuit-breakers
  • MSM is now available with options that enable humidity monitoring, heater monitoring, disconnector and earthing switch monitoring
  • MSM is designed to be compatible with the new EconiQTM solutions

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  Options
Dielectric  Gas pressure / temperature SF6 or Gas mixtures SF6 or Gas mixtures -
  Gas leak rate SF6 or Gas mixtures SF6 or Gas mixtures -

SF6 moisture

- - For MSM-I/-II
Mechanical Travel curve - Calculated -
  Mechanism timing - Yes -
  Contact speed - Calculated -
Wear Coil current analysis - Yes -
  Operations counter  - Yes -
  Contact wear - Yes -
Accessories Heater operation - - For MSM-II
  Motor/ pump run-time - Yes -
  Motor/ pump (unforced) starts - Yes -
  Motor current (curve/ peak) - Yes -
  DS / ES / DES monitoring - - For MSM-II
Interface Webserver Yes Yes -
  IEC61850/DNP3 interface Yes 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 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 
Nominal supply voltage 24 VDC
Isolation voltage max. 2 kVAC
Operating temperature - 40°C up to 70°C
LED Device status indication
Firmware release 2.2
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), DNP3.0 ,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 24 up to 250 VDC / 48 up to 230 VAC 
Product safety IEC 60255-27
Electromagnetic compatibility IEC 60255-26, Zone A
Isolation voltage Max. 2 kVAC
Isolation resistance  100 MΩ
Serial Interface Module (SIM)  
Dimensions W / H / D 34 × 99 × 113 mm
Module power consumption < 3 W
Isolation voltage 2kVAC
Interface EIA-485
Bus protocol Modbus
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 VDC, ±15 VDC, ±5 VDC
Module power consumption < 15 W
Product safety IEC 60255-27
Electromagnetic compatibility IEC 60255-26, Zone A
Operating temperature - 40°C up to + 70°C
Isolation voltage Max. 2 kVAC
Isolation resistance  100 MΩ

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 EconiQTM 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

High levels of humidity in SF6 impact its dielectric withstand (the condensation of water on the surface of insulators will lead to significant reduction of dielectric strength and flashover) and on the formation of corrosive and toxic decomposition products. It is important to control humidity during initial manufacture, assemble, commissioning and over the lifetime of the equipment.

Continuous humidity monitoring is provided as an option, applicable to both MSM-I and MSM-II.

MSM provides:

  • Humidity monitoring for each connected gas compartment
  • Alarms and warnings notification according to thresholds defined as per IEC 60480-2019, IEC 60376-2018 and GB/T 8905-2021
  • Dew point visualization
  • Up to 90 gas compartments connection per stack

Correct heater operation in drives, cubicles, etc. is crucial for reliable operation of circuit breakers.

Monitoring of heaters is provided as an option, applicable to MSM-II

MSM provides:

  • Continuously operated heater monitoring
  • Temperature-controlled heater monitoring
  • Alarm: notified if heater is not operating correctly

Disconnector and earthing switches are critical live components of high-voltage switchgears. Disconnector monitoring is provided as an option, applicable to MSM-II

MSM provides:

  • Motor start counter monitoring
  • Operation type/positions monitoring
  • Motor (RMS) current monitoring
  • Motor runtime monitoring
  • Alarms and warnings notification according to thresholds and misbehaviors during operations
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