Fault Triggered Data Logging System for 6.6 KV Medium Voltage Marine Switchboards

Design, Manufacturing and Installation of a Fault Triggered Event Data Logger System for use With 6.6 KV Medium / High Voltage Switchboard on Commercial Ships

With respect to the original OEM design of the ship’s high voltage switchboard and its control systems, there are multiple channels / circuit branches through which a vacuum circuit breaker (V.C.B.) of a running generator can be tripped during a fault event. And this could lead to a possible blackout of ship’s power.

In many recently reported cases ship crew have faced difficulties in determining the root cause and immediate cause for the VCB to be tripped during a blackout (this observation is applicable for both cases where the crew could immediately re-store the power, and also in the cases where they could not do so for many embarrassing hours).

Observations

• During preliminary incident investigation soon after a blackout, the ship’s crew relying only on the alarm log of the integrated control & monitoring system (ICMS).
  • But, due to the data transfer speed limitation of ICMS, there is always a delay or a time-lag in capturing essential parameters especially during a high speed transient event which could happen within few milliseconds (for example U.V.T. operation is set at 250 milliseconds).
• The location of high voltage switchboard, the remote terminal unit of the ICMS (RSPC-X-) and also, the ICMS main computer is three different locations which is far away from each other.
  • This results a time-lag of capturing high speed data or parameters and further delays the output action and the alarm logging.
• There is no provision to identify if the VCB is tripped due to the function of under voltage trip device (U.V.T).
• No graphical means to provide side-by-side comparison of real time parameters (both digital & analog values).

Channels / Circuit Branches (Main) That Could Command to “Close VCB”

Channels / Circuit Branches (Main) That Could Command to “Open VCB”

Advantages of Fault Triggered Data Logger as a Troubleshooting Tool

1. System is placed inside the low voltage compartment of the switchboard, hence data / parameters directly fed from the HV switchboard to the monitoring equipment.
2. Data capturing is faster, and also able to capture high speed transient faults up to 100 milliseconds.
3. Provision is available to monitor the Under-Voltage Trip Device function. Thereby to notify if the VCB is tripped by the U.V.T.
4. Monitoring system is independent and totally isolated from the existing control and safety circuits of the HV switchboard.
5. No interference with the operation, monitoring and the safety functions of the VCB.
6. Compact components can be easily mounted inside the existing enclosure. Also, can be connected to existing 110VDC power supply unit.
7. Highest reliability thanks to the siemens (Germany) components.
8. Captures and stores multiple parameters simultaneously. When a fault trigger is active relevant parameter values are graphically displayed on a 10-inch-wide colour display 01 minute before and 01 minute after the incident (time frame can be changed in configuration).
9. Data can also be downloaded on to a pc for evaluation.
10. Easily configurable and expandable according to the future requirements.
11. Economical cost.

SPARE PARTS LIST

1. SIEMENS, ET-200 SP, BASE MODULE = 07 PCS
2. SIEMENS, ET-200 SP, SERVER MODULE = 07 PCS
3. SIEMENS, ET-200 SP, 8 X DIGITAL INPUT MODULE = 14 PCS
4. SIEMENS, ET-200 SP, 4 X ANALOG INPUT MODULE = 05 PCS
5. SIEMENS, SCALANCE, 8-PORT, MANAGED ETHERNET SWITCH = 01 PC
6. SIEMENS, S7-312 CPU = 01 PC
7. SIEMENS, TP-900 COMFORT MULTI COLOUR HMI PANEL = 01 PC
8. PHOENIX CONTACT, 3-WAY SIGNAL ISOLATOR, FOR 4-20mA ANALOG SIGNALS = 15 PCS
9. SIGNAL CONDITIONING RELAY, DC CURRENT TO 4-20mA = 07 PCS
10. INTERFACE RELAY, 110VDC, 2-P-C-O = 25 PCS
11. SIEMENS, INDUSTRIAL ETHERNET CABLE, MARINE TYPE = 20 MTRS
12. RJ-45 NETWORK JACKS, RIGHT-ANGLED = 15 PCS
13. DIN RAIL MOUNT FUSE CARRIERS = 14 PCS
14. STANDARD DIN MOUNTING RAILS (IN METERS) = 07 PCS
15. FLEXIBLE CONTROL CABLE, 0.75 SQMM (IN METERS) = 05 REELS
16. FLEXIBLE CONTROL CABLES, 1.5 SQMM, BLUE (IN METERS) = 01 REEL