Abstract
Protection relays design and manufacture have arrived to a new level of advancement; hence, numerical relays have appeared recently. They combine all the functions of monitoring, control, and protection in one device. Also these relays have the ability to communicate with each other to share statuses and orders using GOOSE (generic object‐oriented substation events) messages based on communication protocols such as IEC61850. In this paper, a proposed method for overcurrent (OC) relay coordination has been introduced based on numerical relay features of several setting groups and communication capability. This work supposes that the coordination between feeder, bus section, and incomer protection relays, in a substation of single busbar configuration with bus sectionalizer (i.e., bus section), depends on the status of the bus section circuit breaker (CB) as a criterion for determining active relay setting group, to achieve a faster tripping action. ETAP has been used as a simulation software environment. And the simulation results show the advantages of the proposed method in reducing the time needed by the relay to clear the electrical fault. Siemens SIPROTEC series have been used as an example of numerical relays, specifically 7SJ64 as OC relay, which exists in the ETAP library.
Highlights
After the ingress of microprocessors and operating software in the manufacturing of devices that monitor, control, and protect power system networks, new so-called smart grids have emerged
OC protection is considered as a main protection relay for feeder protection in high voltage substations of different types. e electrical substations can be classified based on many considerations, one of which is the busbar configuration; the one that has been deemed in this work is a single busbar with bus sectionalizer substation which is shown in Figure 1. is configuration is generally used in 132/33/11 kV substation for 33 and 11 kV side
Smart grids with the integration of numerical protection lead to new methods for protection setting and coordination; in [3] a distribution network with central controller was considered to communicate with IEDs based on IEC 61850, providing an adaptive setting to relays to mitigate the changes in system configuration
Summary
After the ingress of microprocessors and operating software in the manufacturing of devices that monitor, control, and protect power system networks, new so-called smart grids have emerged. Is configuration is generally used in 132/33/11 kV substation for 33 and 11 kV side It has the advantage of increasing system reliability through maintaining the power flow during any defect, by closing the bus section to provide load continuity [2]. Smart grids with the integration of numerical protection lead to new methods for protection setting and coordination; in [3] a distribution network with central controller was considered to communicate with IEDs based on IEC 61850, providing an adaptive setting to relays to mitigate the changes in system configuration. Paper [4] proposed to change the predetermined relays setting groups in order to adapt the relays coordination with the distribution generators (DGs) connection state.
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