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Information Journal Paper

Title

Improving Coordination and Operating Speed of Overcurrent Relay against Contingency of Presence of Distributed Generators

Pages

  33-47

Keywords

Distributed Generator (DG) 
Equivalent Impedance (EI) 
Overcurrent relay (OCR) 

Abstract

 The presence or absence of distributed generation (DG) sources in a distribution network has a probabilistic nature. In the event of connection or disconnection of these sources, the fault current through a relay and the relay operating time are affected, which leads to misCoordination. For solving this issue, Coordination constraints corresponding to the presence or absence of DGs have to be considered in the overcurrent relay Coordination problem (CP). The incorporation of these constraints increases the operating time (OT) of the conventional overcurrent relays (OCRs). In this paper, a novel Adaptive Characteristic is proposed to solve this unwanted effect. Accordingly, a function proportional to the equivalent impedance (EI) seen by the relay is added to the relay characteristic. This EI is calculated via in-situ measurement of voltage and current before the occurrence of a fault, continuously; when the fault occurs, the calculated impedance is used in the relay characteristic to determine the OT. The addition of this function to the conventional overcurrent relay characteristic, reduces the effects of disconnecting the DGs on the Coordination constraint, and in general, improves the OT of the relay. Based on the analytical relations and simulation results, it is shown that the OTs of the primary and backup relays with the proposed characteristic are improved compared to the relays with the conventional characteristic.

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    • Cite

    APA: Copy

    HATEFI TORSHIZI, NADER, NAJAFI, HAMIDREZA, & SABERI NOGHABI, ABBAS. (2021). Improving Coordination and Operating Speed of Overcurrent Relay against Contingency of Presence of Distributed Generators. TABRIZ JOURNAL OF ELECTRICAL ENGINEERING, 51(1 (95)), 33-47. SID. https://sid.ir/paper/981519/en

    Vancouver: Copy

    HATEFI TORSHIZI NADER, NAJAFI HAMIDREZA, SABERI NOGHABI ABBAS. Improving Coordination and Operating Speed of Overcurrent Relay against Contingency of Presence of Distributed Generators. TABRIZ JOURNAL OF ELECTRICAL ENGINEERING[Internet]. 2021;51(1 (95)):33-47. Available from: https://sid.ir/paper/981519/en

    IEEE: Copy

    NADER HATEFI TORSHIZI, HAMIDREZA NAJAFI, and ABBAS SABERI NOGHABI, “Improving Coordination and Operating Speed of Overcurrent Relay against Contingency of Presence of Distributed Generators,” TABRIZ JOURNAL OF ELECTRICAL ENGINEERING, vol. 51, no. 1 (95), pp. 33–47, 2021, [Online]. Available: https://sid.ir/paper/981519/en

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