Software
Grounding grid design of 132/11 kV transmission substation with vertical ground rods
This paper presents grounding grid design of 132/11 kV transmission substation with vertical ground rods. The soil resistivity is modeled as a uniform model. The preliminary design shows that the mesh voltage is exceeding the tolerable touch voltage. Therefore, a modification is necessary to improve the safety of the substation.
Design #2 is constructed by adding a crushed-rock protective surface layer and 60 ground rods with 3m long along the periphery. The result shows that the mesh and step voltage is lower than the tolerable values. The analytical calculation is then compared to computer simulation using ETAP Grounding Grid System. It shows a similarities between analytical calculation and computer simulation. However, because of the difference between mesh voltage and the tolerable touch voltage is very small, design #2 still needs to be improved.
The improvement design called design #3 is constructed using unequally spaced horizontal grid conductors with Optimum Compression Ratio (OCR) are analyzed analytically then the results are compared to ETAP simulation. Only 32 rods is used which consisted by 4 rods in the corner with 5m long and 28 rods along the periphery. The result shows significant improvement in mesh voltage and step voltage. Hence, design #3 is a safe and effective solution. It also have been estimated that the total cost material required for design #3 is USD 42,100.
Simplified probability risk assessment is calculated to support the design. Individual risk calculation implies that design #3 is safe because it has no risk of ventricular fibrillation in the vicinity of the substation.
The safety of people in and around high voltage substations is of primary concern when evaluating the performance of a substation grounding grid system. The risk arises as a result of rise of earth potential during power system earth fault conditions. The magnitude of the earth return fault current at power frequency can range from a few kA up to several tens of kA, and the earth potential rise can be as high as several tens of kV even with low magnitude earth impedances in the range of 0.05 Ω to 1 Ω.
In the past, grounding systems were designed to achieve earth resistances below a specified value. Current practice, however, dictates that such grounding systems are designed to control step, touch and mesh voltages within and around the electric Baca entri selengkapnya »
[Solved]SPB Shell License problem
This is not a cracked release, you can look at it as a ‘distribution’.
This info/trick was published on another forum to get this application to work, either or not you purchased it. The only 2 thing
1) A rooted phone is a must.
2) Any terminal app
Open any Terminal app, and after installing (but not opening) the app:
su
pm disable com.spb.shell3d/com.softspb.shell.service.LicenseService
To re-enable the app if it has disabled itself due to licensing:
su
pm enable com.spb.shell3d/com.softspb.shell.Home
best way to use this app just freeze market app by titanium backup
Cara Membuat Keyboard Shortcut di Cadence PCB editor
Buat temen2 yang pasti nya sering make Cadence, biasa ngaktifin tombol add connect pake apa?kalo copy?kalo move?kalo delete..kalo??
kalo biasanya pake mouse, Saya juga udah nyoba sebelumnya dan rasanya cm satu tangan yang gerak, ntar jempol kiri iri karena jempol kanan lebih gede, hehehe
Saya barusan nyoba ngoprek si cadence trus nemu cara buat ngedit keyboard shortcut nya
caranya agak ribet dikit
Analisis Mengenai Windows 8
http://alfredoelectroboy.wordpress.com/2011/05/25/windows-8-segera-rilis-2/
Ketika saya membaca postingan ini, wow.. Saya cukup salut dengan niatan microsoft untuk membuat OS yang bisa berjalan di tablet. Saya jadi kepikiran beberapa hal :
Bagaimana desain GUI windows 8 nanti?
Apakah desain untuk tablet dan PC/laptop akan berbeda?
Bagaimana sisi keamanannya?
Nanti software yang ada sekarang compatible ga ya?
itu adalah sekelumit pikiran-pikiranku soal OS Windows 8 nya Microsoft yang rencana nya akan dirilis tahun 2012. wahh bentar lagi ya, padahal rasanya windows 7 baru saja keluar dan masih banyak orang yang belum pindah ke OS ini. di kantor saya pun rata-rata masih lebih nyaman menggunakan windows XP karena dirasa lebih familiar.
Saya melakukan sedikit googling dan analisis sederhana untuk memuaskan rasa keingintahuan pribadi. Hasil googling dan analisis itu saya uraikan di point-point di bawah ini.
HDMI Design Guidelines : Layer Stack-up, Differential Pair
This article presents design guidelines for helping users of HDMI mux-repeaters to maximise the device’s full performance through careful printed circuit board (PCB) design. We’ll explain important concepts of some main aspects of high-speed PCB design with recommendations.
This discussion will cover layer stack, differential traces, controlled impedance transmission
lines, discontinuities, routing guidelines, reference planes, vias and decoupling capacitors.
Layer stack
The pin-out of a HDMI mux-repeater is tailored for the design in HDTV receiver circuits (see Picture below). Each side of the package provides a HDMI port, featuring four differential TMDS signal pairs, thus resulting in three input and one output port. The remaining signals comprise the supply rails, Vcc and ground, and lower speed signals such as the I2C interface, Hotplug-detect and the mux-selector pins.
FIG 1. The device pin-out is tailored for HDTV receiver applications
[Photoshop]Mosaic Technique
aku belajar sekitar seminggu-an buat nyari literatur dan bahan foto, akhirnya bisa juga bikin gambar pake mosaic technique ini
senangnya saya, hehehe
LINUX:Mengubah CHMOD secara recursive khusus untuk file atau directory
Mungkin hal ini sering sekali kita perlukan. Saya sendiri sering sekali membutuhkan ini ketika perlu merubah chmod atau permission sebuah webhost dengan kasus hanya perlu merubah pemission file atau directorynya saja.
Untuk melakukannya sebenarnya gampang-gampang saja. Perhatikan struktur perintah berikut:
find . -type [tipe-yang-diinginkan] -exec chmod [permission-yang-diinginkan] {} \;
Ok, lanjut.
Nah sekarnag kan kita ingin untuk merubah khusus file atau directory saja. Perhatikan pada contoh berikut ini akan:
- Merubah khusus file saja:
find . -type f -exec chmod 644 {} \;
- Merubah khusus directory saja:
find . -type d -exec chmod 755 {} \;
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