Explain Overcurrent, Overload and Overvoltage.
Overcurrent is the condition where the excessive current starts to flow in the circuit due to overload and especially short circuit.
Overcurrent protection is generally a protection against short circuit where excessive current starts to flow in the circuit which leads to damage the connected equipment.
An electrical overload is the condition where the load takes more current than the normal or rated current.
Overload protection is actually a protection against overheat due to the flow of overcurrent in the circuit for specific time.
Overvoltage is the condition where the operating or supply voltage is higher than the rated voltage of the system specified by the manufacturer.
overvoltage caused by lightning strikes, power system and switching surges and insulation failure etc can be protected by avalanche diodes, voltage dependent resistors (VDR), gas discharge valves, lightning rods, arcing horns etc.
Explain about the protection comes with iELR.
The following types of protection come with iELR. 1. Over Voltage (programmable 60V to 550V). 2. Under Voltage (programmable 0V to 390V). 3. Earth fault protection ( programmable 30mA to 30A).
Explain THD & TDD in power quality.
The total harmonic distortion, or THD, of a signal is a measurement of the harmonic distortion present and is defined as the ratio of the sum of the powers of all harmonic components to the power of the Fundamental frequency. TDD(I) = Total Current ...
Explain Log Interval time for connected meters to LORA gateway.
Single Gateway can connect. 1. 256 Energy Meters with 15 Minutes log interval. 2. 512 Energy Meters with 1 Hour log interval. 3. 1024 Energy Meters with 12 Hours log interval.
Explain Bill of Material for LORA Prepaid meter Installation.
1. Energy Meters: Single or 3 phase; Direct or CT operated, Pre or post paid , Ampere Rating 60A : QTY 2. Communication Hub / LoRa Gateway / DCU : QTY : Radius of 1 Km one number gateway is must. Outdoor ( IP 65) or Indoor gateway ( Range ; 300 ...
Features of 3 Phase ACCL.
Following are the salient features of ACCL. 1. Microcontroller based automatic source changeover with neutral isolation. 2. Intelligent re-connection once a trip has occurred due to either overvoltage or overload. 3. Energy, current, voltage ...