04 April 2010

Lightning Arrester (LA)

Persoalan isolasi adalah salah satu dari beberapa persolakan yang penting dalam teknik tenaga listrik tegangan tinggi. Isolasi yang dipakai dalam setiap peralatan listrik tegangan tinggi adalah merupakan bagian besar biaya yang diperlukan dalam pembuatan peralatan listrik. Oleh karenanya pembuatan isolasi peralatan listrik harus rasional dan ekonomis tanpa mengurangi kemampuan sebagau isolator. Alat pelindung peralatan listrik tersebut dari bahaya tegangan lebih dari luar dan dalam mutlak diperlukan. Alat pelindung dimaksud adalah Lightning Arrester (LA).

LA berfungsi melindungi peralatan listrik terhadap tegangan lebih akibat surja petir dan surja hubung serta mengalirkan arus surja ke tanah. LA dilengkapi dengan:
  • Sela bola api (Spark gap)
  • Tahanan kran atau tahanan tidak linier (valve resistor)
  • Sistem pengaturan atau pembagian tegangan (grading system)

Jenis-jenis arrester:
  • Type expulsion: terdiri dari dua elektroda dan satu fibre tube. Tabung fibre menghasilkan gas saat terjadi busur api dan menghembuskan busur api kearah bawah. Setelah busur hilang maka arrester bersifat isolator kembali.
  • Type Valve: bila tegangan surja petir menyambar jaringan dan dimana terdapat arrester terpasang maka seri gap akan mengalami kegagalan mengakibatkan terjadi arus yang besar melalui tahanan kran yang saat itu mempunyai nilai kecil. Bila tegangan telah normal kembali maka tahanan kran mempunyai nilai besar sehingga busur api akan padam pada saat tegangan susulan sama dengan nol.

34 comments:

  1. thank's ya info nyaa...

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  2. check out our explanation about the differences between lightning isolator vs lightning arrester at http://www.callab2u.com

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  3. fungsinya berarti mirip penangkal petir juga ya

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  4. LA ternyata fungsinya seperti itu ya sangat bermanfaat sekali

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  5. Bila tegangan telah Cheapest wow goldusual kembali maka tahanan kran mempunyai nilai besar sehingga busur api akan padam padaBuy rs gold saat tegangan susulan sama dengan nol.

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  8. terimaksih buat infonya gan, yang dulunya saya gatau sama sekali tentang Lightning Arrester (LA) , skrng jadi tau sedikit, wawasanku nmbh ni, thanks yaa :)

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