| Abstract: |
| High quality electric power supply is the prime goal in the modern power systems around the world. One of the
main ways to achieve this is the protection of the system which needs to be fast, reliable and cost effective. The
objective of this paper is to provide protection of equipments in low voltage (LV) distribution system and thereafter
to avoid their failure due to abnormal operating conditions. The proposed device provides protection for industrial,
commercial and residential equipments by monitoring under voltage, over voltage and over current conditions
using microcontroller, transistor and other discrete components. The microcontroller is the heart of this protective
device which performs the major control of the device. The designed circuit can withstand the loads and the set
voltage range so as to supply the connected load for any voltage variation between 220 and 240 Volts. It can be
used to protect loads such as refrigerator, TV, VCR/DVD player etc. against undesirable over and under voltage
conditions as well as surges caused due to sudden failure of power supply mains. This device can also be used
directly as standalone equipment between the supply mains and the load. The over/under voltage and over
current cut-off with time delay provides over/under-voltage and over current protection and also protection
against any transients. |
| Key words: Distribution system, Protective device, Microcontroller, Over -under voltage, Over current |
| DOI：10.1186/s41601-018-0101-5 |
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| Fund: |
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