Relay Coordination Study: Selectivity Calculations | EEP
The scope of study involves calculating the settings for protective relays to achieve selectivity during faults ocurring in the electrical network for the
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Relay Coordination Study: Calculation of the protective relays setting value to obtain selectivity The scope of study involves calculating the settings for
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When the protection is implemented using a voltage relay, the selected setting must be equal to or exceed the calculated stabilizing voltage. The value of the stabilizing resistor is determined according
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To determine the setting of zone 1 of the distance protection it is necessary to calculate the setting value for the secondary side of the measurement transformer.
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In Appendix D of the EHV Engineering Committee report entitled " Conemaugh Project - Relay Protec-tion for 500 kV Transmission System, January 1971" discusses the development of PJM
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In addition to setting criteria guide lines prepared by Subcommittee on relay/protection under Task Force for Power System Analysis under Contingencies for 220kV, 400kV and 765kV transmission lines, the
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To avoid relay mal-operation, set Slope 2 as high as possible. Normally, a high Slope 2 setting causes slow tripping for evolving faults (external-to-internal faults).
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To determine stability voltage for through fault Vs'' Voltage across the relay at IFS (VS) CT Resistance (RCT)
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Setting calculations require information about line and transformer parameters, CT and PT ratios, and arc resistance to determine impedance-based protection