Cable Fault Location: Pinpointing Solid Shorts, Open Circuits & Splices

SWG-12/1100R portable cable fault location system

A typical method of pinpointing a cable fault is arc reflection, which is performed with the help of a thumper (surge wave generator) and a time domain reflectometer (TDR).

This approach uses the gap at the place of a fault: a surge wave generator sends high voltage surges that, when bridging the gap, cause an arc to burn. This reduces the cable impedance at the place of the fault, creating a terminating event for the pulse of a time domain reflectometer.

As a result, the TDR pulse is reflected off the arc, and the TDR automatically measures the distance to the fault.

The limitation of this approach is that when the gap is too wide, the surge wave pulse cannot bridge it, and no arc can be created. The same is true for when there is no gap at all: if there is no gap, there is no air, and it is impossible to create an arc. Thus, in these two cases the TDR pulse will not find a terminating event and will not be able to pinpoint the fault.

Pinpointing a solid short (bolted fault)

A solid short, or a bolted fault, has not gap at the place of the fault. However, as it has zero impedance, the cable TDR trace will show a negative reflection at the place of the fault. All that needs to be done to localize this type of fault is measure the distance to this reflection.

Pinpointing open circuits

In contrast, an open circuit will be shown on the TDR trace as a positive reflection. To pinpoint this type of fault, the TDR identifies the distance to this positive reflection.

Receiver PT-14

Pinpointing a slice

Locating of a splice can be done using the impulse current mode of a time domain reflectomerter.

If the impulse current does not help, a splice can be pinpointed using a surge wave generator and a receiver (cable tracer). When a thumper transmits high voltage surges, the receiver will pick up a strong deflection at the place of a fault.

Alexei Tiatiushkin
Marketing manager
KharkovEnergoPribor Ltd.
marketing@keppowertesting.uk
http://www.kep.ua

http://news.chivindo.com/357/cable-fault-location-pinpointing-solid-shorts-open-circuits-amp-splices.html

Comments

BT-BASIC commands used

8.10 Some of the most frequently used BT-BASIC commands used are: msi Changes default working directory. Mass storage is Same as “msi” cat Catalogs (list)the node names in the specified directory. get Brings the contents of a file into the system workspace. load Same as “get”. msi$ Returns the directory pathname of the current working directory. msi “..” Backs up one directory level. findn Locates the next occurrence of the a given sting in the workspace. 8.11 If you wish to invoke the HP Board Graphics Viewer, type board graphics at the BT-BASIC command line and press the “ENTER” key on the keyboard. 8.12 A HP Board Graphics Viewer window should now appear

Perhitungan & Cara Merubah Kumparan Blender Dari 220 V Menjadi 12 V

Seperti yang telah dijelaskan pada buku “menggulung motor listrik arus bolak-balik, servis peralatan listrik rumah tangga kelompok penggerak dan perbaikan peralatan listrik pertukangan”, bahwa motor penggerak yang digunakan pada perlatan listrik rumah tangga dan pertukangan seperti blender, mixer, bor tembak, gerinda dsb menggunakan jenis motor universal. Motor universal adalah jenis motor listrik yang dapat disuplai dengan sumber listrik arus bolak-balik (AC) dan arus searah (DC). Jadi peralatan-peralatan listrik rumah tangga dan pertukangan tersebut yang biasanya kita suplai dengan sumber listrik AC dari PLN atau Genset sebesar 220 V sebenarnya dapat juga kita suplai dengan sumber listrik DC yang tentunya tegangan juga harus sama yakni 220 V. Yang menjadi permasalahan bagaimana kalau peralatan listrik rumah tangga atau pertukangan tersebut, sebagai contoh misalkan blender yang ingin digunakan atau dioperasikan pada tempat yang tidak terdapat sumber listrik PLN ata

BT-BASIC command line

8.8 At the BT-BASIC command line type the command msi and the directory path, then press the “ENTER” key on the keyboard. Example: msi ‘/hp3070/boards/aspect/main’ 8.9 At the BT-BASIC command line type the command get ‘testplan’ and press the ENTER” key on the keyboard. You should now see the body of the testplan file displayed in the work space of the BT-BASIC window. 8.10 Some of the most frequently used BT-BASIC commands used are:

Autodesk SketchBook Pro 2021 Full Version

BAGAS31 – Sesuai dengan namanya, Autodesk SketchBook Pro 2021 Full Version ini merupakan software digital sketching atau drawing terbaik yang bisa kamu gunakan. Pada versi terbaru kali ini, ada beberapa penambahan fitur yang sangat efektif. Dengan fitur baru tersebut, diharapkan mampu meningkatkan proses sketching maupun drawing kamu. Autodesk SketchBook sendiri sudah bisa kamu dapatkan secara gratis melalui website resminya. Namun untuk kamu yang mau download versi Autodesk Sketchbook Pro, maka bisa langsung download melalui link yang sudah saya sediakan di bawah ini. Download Autodesk SketchBook Pro 2021 Full Version Screenshot: System Requirements: Windows 10 2.5 – 2.9 GHz of Intel or AMD CPU 4 GB of Memory 256 MB Graphics card with OpenGL 2.0 support We recommend that you use a pressure-sensitive tablet and pen for basic features Download: Autodesk SketchBook Pro 2021 Full Version [ FileUp ][ Uptobox ][ UsersDrive ] Jamu Only [ FileUp ][ Uptob

Testhead

4.3 Testhead The testhead is that portion of the tester that supports the PIN, ASRU and Controller cards. The testhead is divided into two BANKS and each BANK is divided into two MODULES, see figure 2 below. Bank 1 contains modules 0 and 1, bank 2 contains modules 2 and 3. The test fixtures are placed on the banks of the tester and locked down for board testing. The testhead cards interface to the test fixture through the spring loaded pogo pin “nails” at the top edge on each of these card types. 4.4 Support Bay The support bay is a stand-alone cabinet that houses the power supplies for the Unit Under Test. This bay also houses the test station power distribution unit and test station controller on earlier models. 4.5 Emergency Shutdown Switch The emergency shutdown switch is the large red button located at the lower left corner on the front of the testhead. It turns off all AC power to the testhead, and is equivalent to turning off the m

Kelebihan dan Kekurangan Saluran Listrik Jenis Saluran Udara dan Saluran Bawah Tanah

Berdasarkan pemasangannya, saluran distribusi dibagi menjadi dua kategori, yaitu : saluran udara (overhead line) merupakan sistem penyaluran tenaga listrik melalui kawat penghantar yang ditompang pada tiang listrik. Sedangkan saluran bawah tanah (underground cable) merupakan sistem penyaluran tenaga listrik melalui kabel-kabel yang ditanamkan di dalam tanah. 1. Saluran Bawah Tanah (Underground Lines) Saluran distribusi yang menyalurkan energi listrik melalui kabel yang ditanam didalam tanah. Kategori saluran distribusi seperti ini adalah yang favorite untuk pemasangan di dalam kota, karena berada didalam tanah, maka tidak mengganggu keindahan kota dan juga tidak mudah terjadi gangguan akibat kondisi cuaca atau kondisi alam. Namun juga memilik kekurangan, yaitu mahalnya biaya investasi dan sulitnya menentukan titik gangguan dan perbaikannya. Kedua cara penyaluran memiliki keuntungan dan kerugian masing-masing. Keuntungan yang dapat diperoleh dari suatu jaringan bawah tanah adalah

HP3070 TESTER

Search This Blog