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"It has been known that gasification process with a high energy conversion may produce a low flue gas pollution Cogasification is a new research method according to reach gas quality through mixing process of two type of solid fuel. The purpose of this study to find effect of ratio Empty Fruit Bunch (EPB) and Palm Oil Shell (POS) to producer gas composition and Low Calorific Value (LCM). Experimental study has been conducted using a down-draft gasifier which has feeding capacity of 6 kg/'h and injected primary air flow with constant rate of I5 7 (pm. Moisture content of EFB and POS are 42.65 % and 8.6%, respectively. Increasing of EF B weight of 50%, 60% and 70% against POS has shown a decreasing of combustible matter, such as CO, CH2 and H; and also decreasing of LCV."

"ABSTRAKTransformator daya merupakan peralatan dengan investasi terbesar pada sebuah Gardu Induk, oleh karenanya diusahakan sebuah transformator daya dapat berfungsi sesuai dengan perkiraan masa gunanya. Banyak faktor yang mempengaruhi lama masa guna dari transformator, salah satunya adalah memperkirakan kemungkinan terjadinya kegagalan yang diakibatkan karena penurunan sifat isolasi dari isolasi minyak dan kertas.Kegagalan transformator dapat diakibatkan adanya gas-gas yang mudah terbakar didalam kandungan minyak isolasi yang menyebabkan penurun kemampuan isolasi dari isolasi Minyak dan isolasi Kertas. Selain itu pengaruh pembebanan pada pengoperasian transformator daya juga merupakan faktor penting, karena pembebanan dapat menimbulkan panas pada minyak didalam transformator. Dari kedua hal tersebut dibuat sebuah pemodelan tingkat kekritisan transformator daya menggunakan metode logika fuzzy, untuk bisa mendeteksi dini kemungkinan terjadinya kegagalan transformator, sehingga dapat mengurangi risiko penurunan masa guna pada Transformator. Juga didapatkan tren prediksi pengaruh gas terhadap tingkat kekritisan dari gas-gas yang terlarut didalam transformator daya.

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The power transformer is the largest invested equipment in a Substation, therefore a power transformer can function in accordance with the estimated useful life. Many factors influence the longevity of the transformer, one of which is to estimate the likelihood of failure resulting from a decrease in the insulating properties of oil and paper insulation.The failure of the transformer may result from the presence of Combustible gases in the insulating oil contents which lead to the lowering of insulation capacity from Oil insulation and Paper insulation. In addition, the loading effect on the operation of the power transformer is also an important factor, since loading may cause heat to the oil within the transformer. From these two things, a model of critical transformer power level using fuzzy logic method is used to detect the possibility of failure of the transformer, thereby reducing the risk of decreasing the life of the Transformer. Also, there is a prediction trend of the effect of gas on the criticality level of the dissolved gases in the power transformer. "