Calculation of Over Current Relay Setting: Over Load Current (In) = Feeder Load Current X Relay setting = 384 X 125% =480 Amp. Required Over Load Relay Plug Setting= Over Load Current (In) / CT Primary Current. Required Over Load Relay Plug Setting = 480 / 600 = 0.8. What causes a...
Electric utilities are turning to the digital computer for use in calculation of protective relay settings. Common to all computer programs which determine settings for overcurrent relays is a scheme to describe the operating characteristics of the relay to the computer. Specifically needed is the tim...
The fault current flows into the polarity mark of the CT connected to Circuit Breaker 3, so the Directional Overcurrent (67) relay sees the fault in the forward direction. If the fault current is larger than the overcurrent setting, the relay will trip. Directional overcurrent protection schem...
Once the distribution network has been reconfigured, an algorithm of protection coordination is executed based on communication peer-to-peer between Matlab and PowerFactory, which develops an adaptive calculation to determine the current setting and the time multiplier setting. The reconfiguration and ...
The DOCRs feature two control variables: TMS, which determines the operating time of the relay, and PS, which represents the current value at which the DOCR is activated. The calculation of the PS value is based on the maximum load current and fault current. 2.2. Enhancing Objective Function...
The extracted optimal setting is inserted into the ETAP program to implement and evaluate the obtained overcurrent relay setting. The calculation of Incident Energy is based on IEEE1584 while AFIE level is determined by NEPA 70E 2009. This work presents a comparative analysis for the proposed ...
In this case, normal current is still upon the threshold setting by the rated current. If the threshold is set by either 1.2𝐼𝑜𝑝Iop or 1.5𝐼𝑜𝑝Iop, the relay will trip under normal operation. In addition, the fault current faults falls between 1.5𝐼𝑙𝑖𝑛𝑒𝑚𝑎...
For example, the calculation of the power flow in phase components was used to determine the influence of the phase parameters’ asymmetry of the untransposed TOHL on the voltage asymmetry in a network area in [12]. Additionally, the analysis of impedance asymmetry influence on the efficiency ...