A new PMU based power swing detector to prevent mal-operation of distance relay

Artificial Neuron Network Based Faults Detection and Localization in the High Voltage Transmission Lines with Mho Distance Relay

“…This measure must have a directed character. Taking into account the reactive part of the direct impedance (Z_d) makes it possible to offset the distance measurement and the fault resistance [26]. In the absence of a fault (see Figure 4), the distance protection sees only an apparent impedance of the network, dependent on the transit carried out on the line, but in no way comparable to the direct impedance of the line.…”

“…The equations governing the relationship between voltages and currents at the relay location are different for each of these defects. In the following Table 1, we will see the fault impedance algorithm for the different types of defects [26,27]: Table 1. The algorithm of faulty impedance…”

Distance relay reliability enhancement using false trip root cause analysis

“…The mal-operation of this relay is generally due to not only unnecessary tripping during power swing that reduces the security of protection system and hence its reliability but also unnecessary blocking when symmetrical fault occurs accompanying a power swing (Ouadi et al 2016). This latter action may affect on a dependability of the relay and hence its reliability.…”

“…Many techniques have been developed to unblock the operation of the relay during power swing associated with a fault condition such as a negative sequence current magnitude and a derivative of current angle (Lin et al 2008), and a combination of waveform of swing center's voltage (WSCV) and synthetic negative vector (Su et al 2005). A more advanced new blocking and unblocking function based on power swing detector using Phasor Measurement Units (PMUs) has been proposed (Ouadi et al 2016(Ouadi et al , 2011aBentarzi et al 2014). In addition to the local phasors information, the proposed scheme uses remote phasors information from different locations for power swing detection, which can be provided at high speed by PMUs.…”

“…Recently a new approach has been proposed integrating software measurement algorithm that will detect the power swing to enable and to give order to block or unblock the trips (Ouadi et al 2016). In that research work, two PMUs may be used for measuring phase-currents and phase-voltages at both ends of the transmission line.…”