Substation Automation Time Synchro

During the operational time, Time Synchro for the IEDs within the Substation Automation System is an important aspect to consider. Why? Because the event log of the alarm system will have different logging times. This can make you confused because of the different timekeeping between Local and SCADA.

Here is the sample of Synchro Time Status on hopf SNTP (7273).

  • ON: Time Synchro OK
  • OFF: Time Synchro Not OK
Substation Automation Time Synchro Using GPS Clock HOPF
Substation Automation Time Synchro

The Substation Automation Time Synchro

The log time of an alarm within the Substation Automation System should be no different between the IEDs, Server, Human Machine Interface, and SCADA. During the commissioning test, make sure all of the IEDs or other devices within the system get the SNTP Configuration.

Here is the illustration:

Substation Automation Time Synchro
Substation Automation Time Synchro

The connections between SNTP and all of the IEDs are supported by an ethernet switch that is usually applied with the optical fiber connection. Every device needs to sync its time through to the time server device, in this case, let’s say we are using SNTP. Each parameter set for the device needs to declare the settings server time using the IP Address of the SNTP device as the clock master.

When the time synchro is failure

If the synch time fails, it could be a problem when we need to check the time event for the record time event. It means we will have no matching time between the local record from IED, HMI, and SCADA. That is the reason we need to check whether the device parameterization from the time sync setting is correct.

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By Autobot PJM

Power Automation Specialist