Introduction to medium voltage switch gear مقدمة في موزع الجهد المتوسط

Medium Voltage Switchgear
What is switchgear?
Electrical switchgear refers to a centralized collection of circuit breakers, fuses and switches (circuit protection devices) that function to protect, control and isolate electrical equipment. The circuit protection devices are mounted in metal structures. A collection of one or more of these structures is called a switchgear line-up or assembly.
Switchgear is commonly found throughout electric utility transmission and distribution systems as well as in medium to large sized commercial or industrial facilities. Standards for electrical switchgear are defined by IEEE in North America and by IEC in Europe and other parts of the world.
How does switchgear work?
Electrical switchgear refers to a collection of circuit protection devices (circuit breakers, fuses or switches) mounted in a common, metal enclosure. The circuit protection devices distribute power to various sections of a facility and the electrical loads within those sections. They also provide protection to individuals and equipment throughout the facility by limiting the current flow through the system to safe levels.
Types of medium-voltage switchgear
Gas-insulated switchgear
XGIS isometric view
Gas insulated switchgear (GIS) has sealed enclosure(s) filled with insulating gas sulfur hexafluoride (SF6) or mixture of SF6 and other insulating gases recently released to the market. The gas-filled sealed enclosure facilitates a compact, low-profile installation. The use of gas as an insulating medium, when compared to similar air-insulated switchgear, allows for the distance between interrupting components to be reduced. Gas-insulated pad mounted switchgear is designed and tested in accordance to with ANSI standard C37.60 and C37.72. The IEEE C37.20.9 standard for gas-insulated switchgear was released in the summer of 2019, prior to this GIS switchgear is designed, manufactured, and tested to International Electrotechnical Commission (IEC) performance standard 62271.
See our newest gas-insulated switchgear
Metal-clad switchgear
Metal-clad switchgear is defined by IEEE C37.20.2 and refers to the construction of medium-voltage electrical switchgear where all electrical components including the incoming bus, outgoing bus, instrumentation and main circuit breaker or switch, are enclosed in separate metal compartments to provide an additional level of safety, ruggedness and ease of maintenance. Rated voltage levels for metal-clad switchgear range from 5 kV to 38 kV. Metal-clad switchgear features draw-out circuit breakers for ease of maintenance and is often applied in industrial facilities and in electrical power generation and power transmission facilities.
Metal-enclosed switchgear
Metal-enclosed switchgear is defined by IEEE C37.20.3. Metal-enclosed switchgear contains circuit protection devices including circuit breakers, power fuses and fusible switches as well as control and metering equipment. These devices can be mounted in common compartments and do not require the separate barriers, or compartmentalization required in metal-clad switchgear. Metal-enclosed switchgear is applied in commercial and many industrial facilities where the incoming electrical service is above 480/600V.
Types of switchgear enclosures
Medium-voltage switchgear is available in enclosures rated for both indoor and outdoor applications. Outdoor enclosures are available in sheltered-aisle and aisleless configurations for some voltage classes.
Medium voltage switchgear, should be capable of,
Normal ON/OFF switching operation.
Short circuit current interruption.
Switching of capacitive currents.
Switching of inductive currents.
Some special application.
All the above-mentioned functions must be carried out with a high degree of safety and reliability.

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تسلم

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شرح جميل جدا، شكرا للافادة 🤝

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شرح جميل جدا MV تحياتي

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شرح عن ال inter lock بصورة مفصلة

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Auxiliary supply ( internal ) : 110V AC
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I> 1* In .... Ie> 0.1* In ........... Does (In) refer to CT ratio "Say 200/5 for ex. " or rated current 630A.... ??? بمعنى هل يتم التنسيب طبقا لنسبة محول التيار200
ام 630ِِِِ أمبير

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طبقا لل 630 أمبير

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