Evaluasi sistem proteksi arus lebih tegangan 20 KV di PT PLN (Persero) Jawa Tengah dan DIY sebagai antisipasi proyek percepatan pembangunan pembangkit tenaga listrik 10000 MW

ISTADI, Anang, Ir. T. Haryono, M.Sc.,CEng.MIET

2007 | Tesis | S2 Teknik Elektro (Magister Sistem Energi Listrik)

Seiring dengan pertambahan beban di sistem tenaga listrik, kebutuhan akan pembangkit baru menjadi tak terelakkan. Setiap tahun, hampir selalu ada penambahan pembangkit baru di sistem kelistrikan Jawa-Bali. Penambahan ini di satu sisi membawa perbaikan keseimbangan demand-suplai, di sisi lain membawa akibat naiknya arus hubung singkat. Apabila kenaikan arus hubung singkat cukup besar, perlu diperhatikan hal-hal yang terkait dengan aliran arus gangguan saat terjadi hubung singkat. Kejenuhan trafo arus (CT), breaking capacity PMT dan koordinasi relai arus lebih adalah hal-hal yang erat hubungannnya dengan kenaikan arus hubung singkat. Suatu keharusan bila hal-hal tersebut diteliti ulang pada saat penambahan pembangkit di suatu sistem tenaga listrik. Dari penilitian terlihat bahwa penambahan pembangkit dalam rangka Program Percepatan Pembangunan Pembangkit 10.000 MW di sistem kelistrikan Jawa-Bali, berpengaruh terhadap arus hubung singkat 20 kV sehingga perlu dilakukan penggantian beberapa PMT serta dilakukan setting ulang relai arus lebih 20 kV.

In order to fulfill the growing need of electricity power, the need of a new power plant is unavoidable. Almost every year, there is a new power plant being built into electricity system of Java-Bali. The new power plant in one side causes a better balance in demand supply of electricity power, but in another side becomes the cause of increasing short circuit current level. Therefore, when the increase of the short circuit current is large enough, we need to be aware of cases that are tied to the current problem when a short circuit happened. Saturation of current transformer, breaking capacity of Circuit Breaker (CB) and over current relay coordination are the cases that have a tied association with the increase of short circuit current. It is necessary to do carefull analyst when building a new power plant into an electricity system. From the analyst study we can see that the additional power plant, in order to accomplish the early completion construction of 10.000 MW project in the electricity system of Java-Bali, has consequences to the short circuit level therefore it is necessary to do replacement of several CB and resetting of over current relay in 20 kV system.

Kata Kunci : Sistem Tenaga Listrik,Pembangunan Pembangkit Listrik,Proteksi Arus Lebih,short circuit, over current relay,breaking capacity