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Seismic Switch (Digital)

BARC Seismic Switch (Digital) is packed with many distinctive features specially designed for meeting the standards for nuclear industries. This can be helpful in highly accurate detection of a strong earthquake or a structural vibration with various safe shut down options. This has a broad range of applications such as Industrial Processes, Chemical Processes, Gas Valves, Hazardous Systems, Solenoids, elevators, walkways, Electronic gates and doors.

Seismic Switch (Digital) monitors its attachment point to detect seismic (earthquake) motions in all 3 mutually perpendicular axes(X, Y and Z). It monitors acceleration in all the three axes and triggers on detection of Peak Ground Acceleration (PGA) on any axis. The unit provides two numbers of 2 Form C (DPDT) isolated relay contacts. Relay 1 (Earth quake relay) and Relay 2 (Status relay). Coils of both these relays are in energised state during normal operation and de-energises on any fault. This ensures 'fail safe' operation of the system. On-line testability is another important feature in this system which enables the user to manually initiate the self-diagnostics of the system without removing it from the installation. Seismic Switch (Digital) can communicate to a Graphical User Interface Software through an RS-485/RS-232 link. Various features of this software include remote reset for automatic leveling, self test, password protected access, saving instrument details in EEPROM, setting trip parameters, display of battery status, real-time plots of accelerations and display of various other system parameters such as voltage and temperature. The system can be programmed for having additional triggering conditions such as Cumulative Average Velocity (CAV).

SPECIFICATIONS

  • Default trigger condition: Peak Ground Acceleration (PGA) on any Axis. settable range: 0.005g to 1.7g
  • Features: Fail safe design, Online testability, manual and automatic self test
  • 3 dB Cut-off frequency on each axis: 13.5 Hz
  • Output: Two numbers of Potential free 2 form C (DPDT) relays with contact rating of 1.0A at 24VDC - Earth quake relay and status relay
  • Battery: Lithium-ion battery. 3700mAH X2(10Hrs Backup) Automatic charging during main power operation
  • Calibration: Generally not required. Tilt table can be used for verifying the calibration
  • Enclosure and mounting: Rugged IP 66, 4 M8 mounting holes for easy installation
  • Operating Temperature: 0-70 Degree Celsius
  • EMI/EMC: Designed to meet IEC-61000-4.2, 4.3, 4.4 ,4.5,4.6 and 4.8  (to be tested)
  • Chip software: MISRA-C 2006 Complaint. (Verification Under Progress)
  • MTTF:  >80 Years (As per MIL-HDBK-217PLUS)
  • Software features: remote reset for automatic leveling, self test, password protected access, saving instrument details in EEPROM, setting trip parameters, display of battery status, real-time plots of accelerations and display of various other system parameters such as voltage and temperature

APPLICATIONS

  • Primarily designed for Automatic Reactor Trip System (ASTS).
  • Can also be used for Industrial Processes, Chemical Processes, Gas valves, Hazardous Systems, Solenoids, Elevators, Walkways, Electronic gates and door.

BARC Seismic Switch (Digital) is packed with many distinctive features specially designed for meeting the standards for nuclear industries. This can be helpful in highly accurate detection of a strong earthquake or a structural vibration with various safe shut down options. This has a broad range of applications such as Industrial Processes, Chemical Processes, Gas Valves, Hazardous Systems, Solenoids, elevators, walkways, Electronic gates and doors.

Seismic Switch (Digital) monitors its attachment point to detect seismic (earthquake) motions in all 3 mutually perpendicular axes(X, Y and Z). It monitors acceleration in all the three axes and triggers on detection of Peak Ground Acceleration (PGA) on any axis. The unit provides two numbers of 2 Form C (DPDT) isolated relay contacts. Relay 1 (Earth quake relay) and Relay 2 (Status relay). Coils of both these relays are in energised state during normal operation and de-energises on any fault. This ensures 'fail safe' operation of the system. On-line testability is another important feature in this system which enables the user to manually initiate the self-diagnostics of the system without removing it from the installation. Seismic Switch (Digital) can communicate to a Graphical User Interface Software through an RS-485/RS-232 link. Various features of this software include remote reset for automatic leveling, self test, password protected access, saving instrument details in EEPROM, setting trip parameters, display of battery status, real-time plots of accelerations and display of various other system parameters such as voltage and temperature.  The system can be programmed for having additional triggering conditions such as Cumulative Average Velocity (CAV).

SPECIFICATIONS

Table 1 Specifications of Digital Seismic Switch.

Sr. NoSpecificationsValue
1.Actuation MethodsPeak Ground Acceleration (PGA) on any Axis. Default 0.1g on each axis 
0.005g to 1.7g with a set point accuracy of 0.005g. The set point can be fixed through RS-232 /RS-485interface. 
Standardized Cumulative Average Velocity (CAV)
Default CAV Threshold (0.025g ) and Trip on 0.16 g-sec
2.3 dB Cut-off frequency on each axis13.5 Hz
3.OutputTwo numbers of Potential free form C relays with contact rating of 1.0A at 24VDC. Earth quake relay and status relay. Relay actuation conditions is given in the table 1.
4.Closure TimingOn seismic event, relay will remain actuated for user settable time period. Typically set for 5 Seconds.
5.BatteryLithium-ion battery. 3700mAH X2  (10Hrs Backup)
6.Battery ChargingBattery will be charging while system is operated on mains power. Automatic switching to battery during power outage
7.EnclosureIP 66
8.Operating Temperature0-70 Degree Celsius
9.CalibrationGenerally not required. Tilt table can be used for verifying the calibration
10.EMI/EMCAs Per IEC-61000-4.2, 4.3, 4.4 ,4.5,4.6 and 4.8  (to be tested)
11.Functional verification on Shake TableYes
12.Warning conditionsOver temperature; Power supply errors, Flash memory checks and  Battery Charging error  through status relay. RS-232 /RS-485 communication can be used for detailed diagnosis
13.Chip softwareMISRA-C 2006 Complaint. (Verification Under Progress)
14.GUI SoftwareSettings to EEPROM 
Real time Plot and Data Storage 
Self test command
Password protected access
15.MTTF>80 Years (As per MIL-HDBK-217PLUS)


Table 2 Various Triggering conditions of Digital Seismic Switch.

ConditionEarthquake RelayStatus Relay
Earth quakeActuates for 5 secondsNo Actuation
Complete power loss including batteryActuates and latches till power restoresActuates
Manual  confidence testActuates for 5 secondsActuates for 5 seconds
Working on batteryNo actuation. It will actuate on detection of earth quakeActuates when battery power is less than 98%
Automatic confidence test passNo actuationActuates for one second
Automatic confidence test failActuatesActuates
Warning conditionNo actuation

Repeated actuation in 2 seconds interval


APPLICATIONS

BARC Seismic Switch (Digital) is packed with many distinctive features specially designed for meeting the standards for nuclear industries. It can be helpful in highly accurate detection of a strong earthquake or a structural vibration with various safe shut down options. This has a broad range of applications such as Industrial Processes, Chemical Processes, Gas Valves, Hazardous Systems, Solenoids, elevators, walkways, Electronic gates and doors.

After Fukushima incident it has become a regulatory requirement to have Automatic Reactor Trip System (ASTS) on detection of earthquake. This is designed to scram the reactor upon the occurrence of a seismic event, before turbine trip or other conditions resulting from the seismic disturbance could cause a scram. The earlier scram could give a lead time between 5 to 20 seconds. The lead time could provide resulting benefits such as reduced loads during the seismic event and, therefore, fewer burdens on the plant systems. It may also reduce the likelihood of a LOCA or severe transient after a seismic event. ASTS comes under classification as safety Class IA system (reactor protection) and has to meet the relevant standard requirements such as on-line testability, fail safe and other qualification requirements. Since systems that are available in the market and not meeting these requirements, BARC has developed fully functional prototype designs of the Seismic Switch.

FACILITIES REQUIRED / INFRASTRUCTURE REQUIREMENT FOR COMMERCIAL PRODUCTION

  • Standard Electronics PCB assembly and testing instruments such as Soldering station, multi-meters and an Oscilloscope.
  • Windows 7 Desktop/Laptop installed with GUI software of the Seismic Switch.  There should be RS-232 and RS-485 communication ports available in the PC.

An Instrumentation/Electronics/ Electrical engineer who is familiar various qualification procedures of this system.


SR NO. Organization name Licensee Name Licensee Code ACQUIRED ON Valid Till Address City State Email Phone
01 M/S. ELECTRONICS CORPORATION OF INDIA LTD. P. VISWANATH 32 23-09-2016 - ECIL P. O Hyderabad Telangana pvn@ecil.co.in 04027123762
SR NO. COUNTRY NAME PATENT NUMBER
No Data Found.
SR NO. NAME STANDARD NUMBER LOGO
No Data Found.

General License Fee : ₹ 502,000.00 (Five Lakh Two Thousand)

General Royalty : 0%