vodafone Project : Egypt
A- MDB
على يمينك اول ما تدخل من باب الشلتر
Main Distribution Board
لوحة التغذية الرئيسية
التيارد الداخل للوحة :
3pshase current
1- Main Circuit Breaker
A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and, by interrupting continuity, to immediately discontinue electrical flow. Unlike a fuse, which operates once and then has to be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation. Circuit breakers are made in varying sizes, from small devices that protect an individual household appliance up to large switchgear designed to protect high voltage circuits feeding an entire city.
2-Earth leakage
وظيفته الرئيسية الحماية حماية الانسان من الصواعق فى الموقع بفرض حالة حدوث صدمة كهربائية يقوم المفتاح بقطع التيار اوتماتيك ويعاد مرة اخرى برفع المفتاح
The main purpose of earth leakage protectors is to prevent injury to humans and animals due to electric shock
3- Voltage Relays
Under & Over Voltage Protection Relays are used for 3 phase systems, to protect systems from:Phase loss, phase sequence failure, Under voltage, Over voltage
More data
http://www.krk.com.tr/urunler_eng.asp?islem=detay&ID=42&aID=&kID=
4-Surge arrestor
used to protect electronic eq
uipment against lightning overvoltage transients. It is usually connected to wires (power phase line, signal line, zero line) and ground between being protective devices in parallel, when the lightning over-voltage the value of the required actions voltage, arrestor immediate to limit over-voltage amplitude lead to protection equipment and systems, enabling the system to work properly.
uipment against lightning overvoltage transients. It is usually connected to wires (power phase line, signal line, zero line) and ground between being protective devices in parallel, when the lightning over-voltage the value of the required actions voltage, arrestor immediate to limit over-voltage amplitude lead to protection equipment and systems, enabling the system to work properly.
تستخدم للحماية من الصواعق الكهربائية ( زيادة كبيرة فى الجهد ) تعمل لتحديد الجهد المطلوب وتخرجه منها فقط
فتحمى الاجهزة من الصواعق الكهربائية المفاجاة
5- 3 Phase contactor
- A contactor is a large relay, usually used to switch current to an electric motor or other high-power load.
- Large electric motors can be protected from overcurrent damage through the use of overload heaters and overload contacts. If the series-connected heaters get too hot from excessive current, the normally-closed overload contact will open, de-energizing the contactor sending power to the motor.
6-Relay
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