93 → festo.com/didactic Topic coverage Overcurrent/Overload Protection – Evolution of protective relays – Overcurrent protection – Overcurrent and overload protection of AC machines and power transformers – Overcurrent protection of radial feeders Directional Protection – Protection of parallel power lines using overcurrent relays – Directional overcurrent protection – Directional comparison protection – Directional power protection Differential Protection – Effect of the current measuring error on the sensitivity of current differential protection – Percentage restrained differential protection – Application of differential protection3 Distance Protection – Simplified diagram of a power system – Conventional time-stepped distance protection – Distance relay impedance characteristic – Fault impedance vs. load impedance – Line protection – Generator loss-of-excitation protection – Distance protection using communication-assisted tripping schemes Numerical Directional Overcurrent Relay ANSI protection functions: Directional phase overcurrent (67), Directional ground overcurrent (67N), Directional power (32), Instantaneous phase overcurrent (50), Instantaneous ground overcurrent (50N), Phase overcurrent (51), Ground overcurrent (51N). Other possible functions: 27, 37, 38, 46, 59, 74, 81, 86, and 87N Standard version 589061 With safety jacks and connectors 589110 Numerical Distance Relay ANSI protection functions: Phase distance (21), Ground distance (21N), Directional phase overcurrent (67), Directional ground overcurrent (67N), Directional power (32), Instantaneous phase overcurrent (50). Instantaneous ground overcurrent (50N), Phase overcurrent (51), Ground overcurrent (51N). Other possible functions: 27, 37, 38, 46, 59, 68, 74, 81, 86, and 87N. Standard version 589062 With safety jacks and connectors 589111 Numerical Differential Protective Relay ANSI protection functions: Transformer differential (87T), Instantaneous phase overcurrent (50), Instantaneous ground overcurrent (50N), Phase overcurrent (51), Ground overcurrent (51N). Standard version 589891 With safety jacks and connectors 592529 Required accessories, also order: IEC Power Cable (page 28) Siemens DIGSI 5 (license for one non-educational user) 779959 * Note: The license for educational users is free. Recommended Learning Material Workbooks (→ page 162) Campus license: en 8157298 Notes: The campus license includes the student and instructor manuals of the following workbooks: “Overcurrent and Overload Protection”, “Directional Protection”, “Differential Protection”, and “Distance Protection”. Printed workbooks available upon request. Courses on Festo LX aOvercurrent and Overload Protection aUsing Protective Relays aDirectional Protection aDifferential Protection aDistance Protection Electric Power Technology > Protective Relaying
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