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|1||Q||What is electrical switchgear|
|A||Electrical switchgear is a key component in electrical power systems and is used to both distribute electrical power and to selectively isolate electrical loads.
The switchgear is a switching device comprising of connecting or disconnecting switches, fuses or circuit breakers, protective and controlling devices
which can be used to isolate electrical apparatus in faulty condition or during maintenance period, or to connect the same in desired healthy conditions.
|2||Q||Do we need to monitor the switchgear conditions|
|A||Yes, Because switchgear distributes electrical current, heat build-up becomes an important characteristic to monitor. In particular,
unexpected temperature rise at a particular location could indicate corrosion or some other type of defect.
Thermal effects are especially visible in medium voltage switch gears used
in distribution networks, where electrical currents may rise to few thousands of amperes.
Thus keeping switchgears in proper condition over their long life becomes a critical issue.
|3||Q||What are the main causes of arc flashes in industrial switch gear?|
|A||The main causes of arc flashes in industrial switchgear are: the application of tools to energize switchgear, deteriorated insulation on phase bus bars,
and loose electrical connections that overheat.
These things can be prevented by proper safety measures and regular maintenance.
|4||Q||What is the lowest voltage at which arc flashes occur?|
|A||120 volts is generally considered the lowest voltage at which arc flashes occur.
The voltage of industrial switchgear can exceed this voltage by hundreds of thousands of times.
|5||Q||What is Metal Enclosed Switchgear?|
|A||Metal Enclosed Switchgear is a switchgear assembly that encloses all necessary equipment and device in separate metal vertical structure (i.e MCCs, PCC),
however they each metal compartment are not separated from one another by metal barriers. It's used often with low voltage equipment.
|6||Q||What is Metal Clad switchgear?|
|A||Metal Clad Switchgear is a switchgear assembly that encloses all necessary equipment and devices in one metal house,
but compartments in this assembly is separated fromone another by metal barrier.
When metal clad switchgear is used or assumed when MV switchgear is provided.
|7||Q||Difference between Metal Enclosed Switchgear and metal Clad Switchgear.|
|A||Metal enclosed switchgear Assembled with separate metal vertical section Metal Clad Switchgear: Assembted in one metal structure.
MES: each compartment is not separated from one another with metal barrier.
MCS: each compartment is separated from one another with metal barrier. MES: Frequently used in LV system.
MCS: Frequently used in MV System. When MCS is said MV Switchgear is assumed. MES: All breakers and other switching devices are fixed type.
MCS: All breakers are withdrawable type.
|8||Q||How's your electrical switchgear waranty?|
|A||Once you buy the product manufactured by Jiangxi Yikai Electric can get 24 months waranty after delivery date.|
|Please provide those below detailed in formation, when you order the switchgear.|
|1||Main connect!on wire solution serial number and single line system diagram, arrangement and plane layout drawing|
|2||Main connect!on line solution serial number, purpose and single line system diagram, rated voltage, rated current, rated short circuit breaking current,
distribution electricity chamber plane layout diagram, arrangement diagram of switchgear and so on.
|3||Secondary connection wire diagram, terminals arrangement diagram. If you can't provide terminals arrangement diagram,
we will provide the terminals arrangement according to manufacturer's diagram.
|4||Requirement of switchgear control,measurement and protection function and requirement of other shutting and automatic device.|
|5||Model, specificaton, quantity of switchgear equipment's electrical apparatus elements|
|6||Electrical equipments summary sheet|
|7||If the interspace of switchgears or incoming line cabinet need bus line bridge to connect, please provide rated load current of bus line bridge.|
|8||If you need busbar (busbar between two array cabinets and busbar between wall cabinets), please provide detailed span and high altitude distance.|
|9||If the switch equipment are used in the special environment conditions, please put forward it when you order the switchgear.|
|10||When you need other apparatus or exceed attachment supplied equipment list, please put forward model nd quantity you need.|
|11||Other special requirements.|