2. LRU FRICK Motor Protection Relay Upgrade

1. My first project is:

My first project is a FRICK motor protection relay upgrade in the LRU from a GE Multilin 469 Relay to a SEL 710-5 Relay. 

2. The 710-5 is:

The 710-5 is essentially a newer model of the 469 since they are more reliable and flexible, allowing us to configure the relay to offer more protection.  

3. In this project,:

In this project, I was originally given 2 tasks: (1) create an IFC and Demo Package, (2) configure the new relay settings.  

4. However,:

However, as I progressed, we realized this should've been an items for projects, so we will be submitting a PRF 

5. After:

After preparing the IFC and Demo drawings, I verified thermal curves to make sure the trip settings in the new relay are correct.  

6. This upgrade is important because:

This project taught me that This upgrade is important because the 710-5 better protects the motor against adverse issues, such as thermal damage and overcurrent, by communicating and relaying information with the circuit breaker to trip the motor prior to failure.  

7. For instance,:

For instance, since the 469 was not effective at calculating the number of motor starts per day, the previous team needed to limit the motor starts per day to 6.  

8. An upgrade to a:

An upgrade to a 710-5 would remove this 6 starts per day restriction since the new relay can calculate the cooltime to be able to restart the motor instead of being limited by outdated constraint.  

9. If the:

If the relay does not function properly, this would prematurely shut down the motor, potentially leading to a shutdown of the LRU and an LPO of $500K everyday until the motor is back online  

10. To prevent this:

To prevent this, it is critical that the motor protection relay does not fail, which is what this upgrade from the 469 to 710-5 ensures.