Heavily loaded Power Systems operating near the stability limit are prone to the occurrence of power flow oscillations that happen because of the presence of a fault, loss of generation capacity, or other type of disturbance such as the loss or insertion of loads, in the system. Large Power Swings can cause unwanted relay operations which may aggravate the original power system disturbance resulting in cascading blackouts across the power system.


Modern protection systems can differentiate between stable and unstable Power Swings and operate properly for them using Power Swing Blocking and Out-Of-Step tripping elements. Properly testing these elements, requires understanding the difference between a stable and an unstable power swing, what is the principle of operation of such elements and how to generate the proper power system signals to simulate such conditions.

In this webinar we show the theory behind stable and unstable Power Swings as well as their effects in the operation of the power system. We show how relays can detect Power Swing conditions, and differentiate between a fault and a Power Swing to avoid unnecessary trips. We also discuss several methods used for Power Swing Blocking. We then show different ways to simulate Power Swings, and how to verify the proper operation of the Power Swing Blocking elements in the relay. We also show different ways to simulate unstable Power Swings and how to use the results of such simulations to properly test the operation of the Out-Of-Step protection in the protection system.

 

This is a free webinar

All webinar attendees are eligible to receive 1 NETA CTD and 1 PDH or 0.1 CEU. 

 

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