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Modular Switchgear Monitoring (MSM)

Applications

The Modular Switchgear Monitoring (MSM) is an add-on system to supervise SF6 density in enclosures of high-voltage gas-insulated switchyards. It operates independently of existing control and protection devices. MSM is applicable for retrofit of existing substations and for new installations.
 

  • SF6 density monitoring in Gas Insulated Switchgear
  • Optimize maintenance by using trend calculation
  • Provides data for remote condition monitoring and advanced maintenance strategies

Why Hitachi ABB Power Grids?

  • Software independent visualization
    • The integrated web server allows displaying the monitoring information on a web-browser-based user interface in the LAN or WAN
    • Web client shows temperature-compensated pressure, leakage rates, alarms and displays a graphical trend chart of the SF6 pressure
    • Ranking of the analyzed data supports the customer's maintenance planning of the switchgear.
    • User management prevents unauthorized access to the system and its data
  • Local HMI
    • Local displays can be installed in the bay cubicle.
    • Green and red LEDs signalize device status and gas value alarms
    • Easy navigation through the measurement data, alarm list and event history
  • Network Control Center
    • Transfer of data to Network Control Center via IEC 61850 or DNP3 for further processing
    • Critical alarm can be sent via conventional alarm contact
Modular Switchgear Monitoring (MSM)

Get to know more

MSM System and common module properties  
Maximum number of monitored gas compartments 1000
Operating ambient temperature1 -25..+55°C
Protection class IP 20
Input voltage range of power supply 85..264 VAC, 90..375 VDC
1: For legibility of the LC Display, temperature range is limited to -5..+50°C.  

 

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
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
Current firmware version 2.0.0

 

Analog Input Module (AIM)  
Dimensions W / H / D 45 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..20 mA / 4..20 mA
Accuracy 1% full scale
Current firmware version 1.2.1

MSM monitors SF6 density in all gas compartments of a high-voltage gas-insulated switchyard. It ensures early detection of critical situations and scheduling of countermeasures into non-critical times. MSM supports maintenance planning by calculation of leakage trend. Therefore, inspection work can be significantly reduced and maintenance costs can be reduced by improved maintenance planning.

The SF6 pressure data of the switchgear is acquired periodically. The implemented trend algorithm calculates the leakage trend for all connected SF6 gas compartments. The current pressure value and leakage rate can then be displayed on a local display or on a web client.

Additionally, all data can be transferred to Network Control Center via IEC 61850 for further processing and alarm handling. A critical alarm can also be sent via conventional alarm contact.

Visualization

  • Local HMI - Local displays can be installed in the bay cubicle. The CANOpen protocol allows multiple displays to be connected to one MSM stack. The HMI provides an easy navigation through the measurement data, an alarm list and event history. The green and red LEDs signalize device status and gas value alarms.
  • Web Interface - Each MSM has an integrated web server which allows displaying the monitoring information on a web-browser-based user interface in the LAN or WAN. The web client shows pressure, leakage rates, alarms and displays a graphical trend chart of the SF6 pressure. A ranking of the analyzed data supports the customer's maintenance planning of the switchgear.

Specification template for SF6 Monitoring:

The GIS should be equipped with a system to monitor the SF6 tightness of the gas compartments. The system should identify unusual SF6 leakage rates and upon this trigger alarms. The system should have the following features :

  • The SF6 density / temperature-compensated pressure, as well as the leakage rate, are accessible via a web-based user interface and via communication protocol IEC 61850 / DNP 3
  • The period until critical gas filling ratios are reached is calculated and displayed
  • Measured data is stored over several years and can be simply exported for analysis
  • Access to the web-based interface is password protected and provides several user groups
  • The system offers one central communication interface for the complete substation (Ethernet)
  • The system has an internal monitoring feature which identifies system failures and triggers alarms (watchdog)