My Mind, My Heart, My File

Buchholz protection
Failure of the winding insulation will result in some form of arcing, which can decompose the oil into hydrogen, acetylene, methane, etc. Localized heating can also precipitate a breakdown of oil into gas. Severe arcing will cause a rapid release of a large volume of gas as well as oil vapor. The action can be so violent that the build-up of pressure can cause an oil surge from the tank to the conservator.
The Buchholz relay can detect both gas and oil surges as it is mounted in the pipe to the conservator (see Figures 15.32 and 15.33).

The unit contains two mercury switches. The production of gas in the tank will ventually bubble up the pipe to be trapped in the top of the relay casing, so displacing nd lowering the level of the oil. This causes the upper float to tilt and operate the
mercury switch to initiate the alarm circuit. A similar operation occurs if a tank leak auses a drop in oil level.
The relay will therefore give an alarm for the following conditions, which are of a low rder of urgency:
• Hot spots on the core due to shorted laminations
• Core bolt insulation failure
• Faulty joints
• Inter-turn faults and other incipient faults involving low power
• Loss of oil due to leakage.
The lower switch is calibrated by the manufacturers to operate at a certain oil flow rate i.e. surge) and is used to trip the transformer HV and LV circuit breakers. his calibration is important, particularly with large transformers having forced
circulation, where starting of the pumps can sometimes cause a rush of oil into the onservator pipe. Obviously operation should not occur for this condition.
When oil is being cleaned and filtered on load as part of routine maintenance, aeration ill take place and air will accumulate in the Buchholz relay. It is therefore recommended hat tripping be disconnected, leaving the alarm function only, during this oil treatment rocess and for about 48 h afterwards. Discretion must then be used when dealing with he alarm signals during this period.

Because of the universal response to faults within the transformer, some of which are ifficult to protect by other means, the Buchholz relay is invaluable. Experience has hown that it can be very fast in operation. Speed as fast as 50 ms have been recorded, eating all other protection systems on the transformer in process. Gas sampling facilities re also provided to enable gas to be easily collected for analysis.

Source : Practical Power Systems Protection, Elsevier

Ketika umat Islam terlena oleh kebesaran Al Islam..apa jadinya. Itulah yang terjadi dimasa sekarang ini. Kita tahu, Al Islam itu Dien yang lengkap, Al Islam itu paling benar, yang diterima Allah, Islam itu rahmat bagi alam semesta. Kehidupan telah diatur dalam Al Islam dengan baik, segala segi telah dirambah. Umat Islam sangat tahu dan bangga, bahkan kadang-kadang “over-pride” sehingga kebesaran Al Islam malah sebagai alat untuk menyalahkan yang lain, menghancurkan yang lain, menghujat yang lain.

Kita tahu dan sadar kebesaran Al Islam, dan sebagai umat yang meyakini Islam sebagai jalan hidup, kita harus bangga dan yakin, sebagai penyemangat kehidupan itu. Tetapi kebesaran Al Islam cuman sebatas teori dan bahan pamer jika umatnya tidak mengamalkan dan cuman menggunakannya untuk berbangga bangga diri. Kadang malah timbul aroganitas karena sadar Islam yang paling benar, paling besar dimuka bumi, satu satunya yang diterima Allah.

Banyak umat Islam yang terjebak dengan kebesaran Islam dan salah mengartikannya. Mereka gunakan untuk memaksa yang lain, menvonis yang lain, dan dengan tega sudah menentukan mana yang masuk surga mana yang enggak.

Seharusnya dengan kebesaran Al Islam, umatnya harus mawas diri. Kebesaran Al Islam tertutupi oleh tingkah polah umat Islam yang sesukanya saja. Cuman bangga tapi implementasi ajarannya nol besar. Ajaran Al Islam cuman sebagai pemanis di masjid2, mushola2, diskusi2, muktamar, dll, tetapi di lapangan ternyata tidak ada apa2nya. Al Islam cuman ada dlam mimpi. Untuk menghadapi berbagai persoalan umat tidak bisa.

Mawas diri, rendah hati dan bekerja keras mengimplementasikan Al Islam di kehidupan nyata.Haji yang menelan banyak sekali dana, tenaga dan jumlah pelakunya begitu heboh dan hebat, tetapi efek terhadap perilaku sehari2 sangat minim. Haji kadang cuman jadi prestise. Ibadah yang paling penting adalah esensinya selain syariatnya. Efek dari ibadah itulah yang dinanti2kan.

Kita juga kadang terlena dengan kebesaran Al Islam pada suatu jaman, bangga sekali. Tapi cuman sebatas bangga dan sebagai bahan cerita saja. Cobalah ambil pelajaran dan yang bisa kita lakukan, lakukan.

Umat islam akan terus jadi buih dalam lautan kalo cuman berbangga2 terhadap kehebatan ajarannya, bukan berlomba2 mengimplementasi dan menunjukan bukti kehebatan Islam pada dunia. Kita sibuk hal hal yang tidak perlu, menghujat Amerika, menghujat “para musuh Islam”, sibuk memproklamasikan permusuhan, sibuk meributkan hal hal sepele, lupa pada masa depan Islam.

Wake up man….

Google emang gila..baru 9 tahun, pemiliknya sudah masuk menjadi 5 besar orang terkaya di dunia? Apa rahasia mereka? Creativity? Visi yang jauh ke depan? Pandai melihat peluang? Berani bertindak? Punya terobosan yang orang lain ndak punya? Bisa membaca kebutuhan manusia?

Edan…

Transformer differential protection
Transformer differential protection protects against short-circuits between turns of a winding and between windings that correspond to phase-to-phase or threephase type short-circuits.
If there is no earthing connection at the transformer location point, this protection can also be used to protect against earth faults. If the earth fault current is limited by an impedance, it is generally not possible to set the current threshold to a
value less than the limiting current. The protection must be then carried out by a high impedance differential protection.
Transformer differential protection operates very quickly, roughly 30 ms, which allows any transformer deterioration in the event of a short-circuit between windings to be avoided.
Transformers cannot be differentially protected using high impedance differential protection for phase-to-phase short-circuit due to the natural differential currents that occur:
– the transformer inrush currents. The operating speed required means that a time delay longer than the duration of this current cannot be used (several tenths of a second);
– the action of the on-load tap changer causes a differential current.
The characteristics of transformer differential protection are related to the transformer specifications:
– transformation ratio between the current entering Iin and the current leaving Iout ;
– primary and secondary coupling method;
– inrush current;
– permanent magnetizing current.
The block diagram is shown below:

Source : Protection of electrical networks / Christophe Prévé.

Ten Competencies

The ten leadership competencies form the heart of this book; each is described in a separate chapter, beginning with Chapter 2. Here are brief descriptions of each competency.

Winning Intellectual Commitment

Insight —seeing what is, in a new way. Insight is a perception about a complex set of circumstances that is deeper and clearer than whatever perception prevails at the time. It often comes suddenly. For leaders, insight is most often about the needs or aspirations of a group of people.

Vision —an ideal image of identity and the future. A vision proclaims a leader’s commitment to work toward an ideal. It serves followers as a touchstone, and as a picture of where they are all going together. It also challenges them to consider who they are and who they wish to become. A vision is a leader’s answer to the question, ‘‘What could be?’’

Storytelling —presenting the story in an unforgettable way. A leader’s story contains his vision, the rationale for the vision, and ideas about what to do in order to achieve it. The presentation of the entire story must be compelling and inspiring. The leader is part of the story and must ‘‘walk the talk’’ and ‘‘be the story.’’ There is a consistency about leaders—who they are, what they do, and what they say. The story and the person support one another.

Mobilizing —transforming energy into committed action. A well-told story creates human energy. Leaders have three roles to play in transforming that energy into action: enrolling people, educating them, and helping them narrow the broad challenges described in the story into actions that they can and will perform. These three roles are enacted during an extended dialogue between the leader and followers that includes everything that happens between them.

Winning Emotional Commitment

Self-Awareness —attentiveness to one’s self. Emotions, motivations, hot buttons, strengths and weaknesses, style, values, the penchants that derive from the family of origin, and from life experience—all influence any attempt at leadership. Since the very self of the leader is his most potent (and perhaps only) instrument, it is wise to know that self well.

Emotional Engagement —the ability to create a flow of productive feeling between the leader and her followers, and among the followers themselves. Emotional engagement depends heavily upon a leader’s skill at empathy—sensing and prizing the feelings of others. A person knows a leader is empathetic when he feels heard and affirmed—not necessarily agreed with, but understood and accepted.

Fostering Hope —creating the feeling that something desirable is possible or likely to happen. A leader’s ability to foster hope depends upon his optimism; the tendency to believe that right will prevail, that good will triumph over evil, that hope is a fitting response to difficult challenges. The ability to instill hope through optimism is an essential leadership task.

Winning Spiritual Commitment

Rendering Significance —drawing the connections from the leader’s insight, vision, and story to a higher meaning and purpose. By rendering significance to their insights, visions, and stories leaders help people come to full human maturity through the diverse forms of their individual lives.

Enacting Beliefs —translating beliefs and principles into leadership activities, not as a religious statement, but as an endeavor of good leadership that wins high commitment.

Centering —the discipline of bringing in rather than leaving out. In a leader’s contacts with followers, mind, emotion, and spirit are invited in when they show up. Centering is the competency through which a leader brings all of the other competencies together as a seamless whole.

The Art of Winning Commitment: 10 Ways Leaders Can Engage Minds, Hearts, and Spirits, by Dick Richards

Arsene Wenger of Arsenal merupakan salah satu pelatih fenomenal. Dia adalah seorang “star maker”, pencipta bintang. Dia lebih suka membina pemain muda muda untuk diorbitkan dan dijadikan salah satu pemain bintang dunia. Terakhir hasil polesannya adalah Cesc Fabregas yang baru berusia 20 tahun, tetapi sejak tahun lalu sudah mulai bersinar dengan mengobrak abrik tim lawan.

Kenapa Arsene Wenger? Karena dia pelatih yang sempurna, karena bisa mencetak bintang dari scratch only. Bisa menjadikan pemain “noboby” menjadi “somebody” sekaligus menghasilkan uang. Tidak banyak pelatih yang seperti itu. Mungkin cuman Ajax Asterdam dan Barcelona yang mempunyai visi yang sama dalam mencetak pemain bintang.

Ketika Arsene Wenger merevolusi gaya permainan Arsenal waktu pertama datang di Inggris, dari type defensif menjadi ofensif, , dan telah menjadikan Arsenal sebagai kekuatan di liga Inggris dengan beberapa tropinya.

Hebatnya Arsene Wenger, dia lulusan engineering dan master di bidang ekonomi. Itulah mengapa kepribadiannya yang kalem, berwibawa dan terjaga. Dia juga bisa sekitar 7 macam bahasa.

Banyak pemian besar sudah lahir dari binaannya…Dialah sang “star maker”

Keberaniannya, kekonsistensinya, kesabarannya, kesmartnya, intelegencenya….Wenger!

Education’s purpose is to replace an empty mind with an open one.
- Malcolm Forbes

Pendidikan sekarang mahal…pendidikan hanya untuk orang “the have” saja. Pendidikan makin eksklusif. Pendidikan cuma untuk nyari titel dan selembar kertas. Pendidikan membuat orang jadi sombong, sok tahu, pinter ngakalin orang lain. Berapa banyak profesor di Indonesia, sekolah mereka tinggi2, sampe ke negeri2 seberang. Terus ilmunya untuk apa? Biasanya yang dipakai title dan selembar kertas doang, ilmunya mah ndak tahu dikemanakan. Dengan titel dan selembar kertas, maka pangkat akan naik, gaji naik, tunjangan naik, tumpangan juga naik.

Jaman sertifikasi sedang “in”. Kualitas pengajar sedang ditingkatkan, katanya. Pada kenyataannya, orang cuman peduli dengan selembar kertas dan beberapa huruf titel. Ilmu sudah tidak diperdulikan lagi. Orang orang berilmu dan idealis yang tidak punya selembar kertas dan beberapa huruf titel semakin terpinggirkan. Orang cuman peduli ame kulit dan omongan2 kosong, sudah tidak perduli pada isi.

Apa sih orang yang bisa sukses di Indonesia? Orang yang bisa omong kosong, ndak ada kerjanya, pinter menjilat dan pinter menjatuhkan yang lain. Mereka naik dengan menginjak kepala orang lain, bukan karena kemampuan diri yang mumpuni.

Tentu saja orang2 akan skeptis terhadap pendidikan. Ada dual hal. Pertama punya pendidikan tetapi ilmunya ndak kepakai, yang kedua pendidikan cuman untuk gengsi2an. Banyak lulusan teknik yang masuk ke ekonomi, hukum masuk teknik, pokoknya tidak karuan. Ahli2 dan spesialis makin terpinggirkan, yang maju biasanya generalis yang politikus. Pendidikan jadi tidak merata juga. Ada yang dapet sampai berlebihan dan mubazir, ada yang ndak dapet samasekali.

Kadang orang dinilai dan dihargai cuman dari selembar kertas, bukan dari skill, pengalaman atao track record. Diperparah dengan Korupsi, Kolusi dan Nepotisme, lengakap sudah hancurnya pendidikan dinegeri ini. Tidak perlu pinter untuk bisa masuk lembaga pendidikan terkemuka, yang penting punya duit. Goblok juga tidak apa2 yang penting sumbangan duit kamu besar.

Lihat aja nanti kualitas para terdidik di Indonesia akan letoy, cuman duit kembali ke duit. Yang penting dapet duit. Pengembangan ilmu dan pengetahuan nomer sekian. Kita cuman bisa jadi follower. Ikut ikutan.

Menarik apa kata Forbes, pendidikan itu untuk membuka pikiran kita, terbuka terhadap perubahan baru, terbuka untuk menjadikan ilmu dan pengetahuan lebi bermanfaat secara optimal, terbuka terhadap pandangan yang lain.