Thursday, August 19, 2021
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Thursday, August 12, 2021
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Friday, August 6, 2021
Surge Protective Device
Types of Surge Protection Device
According to the standards, surge protective devices are classified into three different types:
- High voltage SPD
- Medium voltage SPD
- Low voltage SPD
Low voltage SPDs do not limit the voltage like high voltage and medium voltage SPDs. Low voltage surge arresters are further divided into three classes:
Type 1: This type of SPD is used in industrial buildings to protect insulation levels against external surges caused by lightning. They can be installed between the secondary side of the utility transformer and the line side of the main service equipment over current protective device, as well as the load side of the main service equipment. It protects the system from direct lightning strokes.
Type 2: The type two of low voltage SPDs is normally installed on the load side of the main service equipment over current protective device. These surge devices may also be installed at the service entrance point, but should be installed on the load side of the main service over current protective device. These types of SPDs prevent the spreading of over voltage to the installations and protect the system from damage.
Wednesday, August 4, 2021
Energy meter calculation പഠിക്കാം (DC Circuit)
ആദ്യം Electrical Power എന്താണ് എന്ന് പഠിക്കുക
താഴെ CLICK ചെയ്യുക
ELECTRICAL SUPERVISOR EXAM
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