Line Tripping
- event System Separation In The Continental Europe Synchronous Area
- category Transmission line tripping
- contingency type Transformer(s) tripping
- primary cause Overcurrent protection tripping during overload
- secondary causes Power swing
- impacts No content
- mitigations No content
- number of customers affected No content
- epri research program Program 40: Transmission Planning
- epri research project P40.018: Transmission Protection Support Tools
- epri research deliverable Guide to Modeling Protection Systems in Planning Studies
description
The tripping of the first two elements (busbar coupler overload protection and overload protection in the first 23 seconds), occurred in a situation of extremely high power flows of around 6.3 GW from the South-East area of the (CE) power system towards the North-West area. The flow of 6.3 GW results by summing up the individual active power flows at 14:00 over the fifteen transmission system elements which tripped. The initial tripping of the busbar coupler in Ernestinovo led initially to the redirecting of the busbar coupler flow through the 400/110 kV transformers in Ernestinovo which subsequently tripped as well, and then following that, to a shift in power flows to neighbouring transmission lines. The resulting separation line crosses at least four European transmission system operators, namely HOPS, NOS BiH (Bosnia and Herzegovina), EMS and Transelectrica. This transient drove the system into two separate synchronous areas in which the South-East area was in overproduction and the North-West area suffered a power deficit.
The following protection elements activated due to the events:
- overload protection
- distance protection
- distance out of step protection
- distance power swing