Optimization of overcurrent relay coordination using cuckoo search algorithm in electronic induction systems

Overcurrent relay protection is one of the electrical power supply protection
mechanisms that serve to prevent the system from overcurrent. The main issue that occurs when
developing the coordination of overcurrent relays is the timing determination of the primary and
back-up relay operation. The objective of this study is to develop an optimization method to
result a faster operating time of relay coordination. The optimization method was developed and
implemented in case of PT Semen Padang (Indarung VI) at 150 kV PLN’s source, which was
operated with conventional calculation method. The Cuckoo Search Algorithm (CSA) method
was proposed as optimization method for calculation. The optimization was used to set the relay
time and the secondary current (Ipickup) according to the British standard to obtain the optimal
Coordination Time Interval (CTI). The CSA method was calculated by MATLAB R2016
software, while the relay testing was done on the ETAP 12.6.0. Results of simulation indicate
that the CSA method more capable and faster than the manual calculations in calculating relay
setting coordination since almost all of the CTI values were reached in 2.0 to 4.0 seconds.