Cable Fault Locating & Transformers Testing

20/09/2025

احدى الطرق لاختبار عمل اجهزة الاختبار تحديدا اختبار الشاكوش surge generator :
عمل ثغرة air gap وتشغيل ال surge لاختبار عملية الشحن والتفريغ
● اي عمل عطل وهمي
● من واقع الخبرة العملية

20/09/2025

20/09/2025

اهمية نظام التيار المستمر في الموزعات ومحطات النقل

20/09/2025

Surge unit maintenanc
Classic cable test van R20U
Air gap method

19/09/2025

Maintenance of power transformer

19/09/2025

Main transformer alarms and trip

11/09/2025

Cable fault location

10/09/2025

Power plant operation
خطوات ومبدأ نقل التغذية الكهربية من المحول المساعد الى المحول المساعد الاخر
● لتوصيل المحولات على التوازي يستلزم شروط معينة
● يتم الخروج بأحد المغذيين من المحولات والدخول بالاخر
● استخدام طريقة ٣ من ٤
3 out of 4 interlock method

09/09/2025

■ what is circuit trip supervision?
■ how to test C.B for trip?
■ perform a complete test to current transformer?
■ draw the scheme of switchgear.
■ explain cable fault location process.
■ how to perform tan delta test for insulation resistance?
■ contact resistance test, explain.
■ how do you perform winding resistance for CT?
■ Why is hi-pot test fail if cable is connected to a VT?

08/09/2025

■□■ Electrical measuring devices are essential tools for testing, troubleshooting, and maintaining electrical systems. Among the most common are the Megger, Ohm meter, and Teleflex SX, each serving a specific role:

■ Megger (Insulation Resistance Tester):
Used to measure the insulation resistance of electrical cables, transformers, and equipment. It applies a high DC voltage and indicates the resistance value in megaohms, helping detect insulation deterioration, moisture, or faults.

■ Ohm Meter (Resistance Meter):
A basic device that measures the electrical resistance of a conductor, winding, or circuit. It operates by passing a small current through the component and reading the voltage drop, displaying resistance in ohms.

■ Teleflex SX (Cable Fault Locator):
A time-domain reflectometer (TDR) system used for pinpointing cable faults. It sends test pulses into the cable and analyzes reflections caused by impedance changes, allowing precise location of short circuits, open circuits, and high-resistance faults without damaging the cable.

28/08/2025

■ factory acceptance test
Resonance AC test for medium voltage power cable according to IEC
● 3.5 * rated voltage ( phase to ground)
● 12/20 kV cable is tested at 42 kV for 5 minutes ( acceptance factory test)
● partial discharge test for 1 minute at 1.7* rated voltage (phase to ground)
So, tested at 20 kV
Accepted if below 10 Pico coloumb
من لجنة فحص واختبار طلبية كابلات جهد متوسط لمشروع حياة كريمة
مصنع الجيزة باور للكابلات
ابو رواش مدينة السادس من اكتوبر

26/08/2025

تابع عناصر التأمين عند العمل مع الكهرباء
● عند العمل على الدوائر المغذاة من مصدر بطارية يتم فصل ground cable من البطارية