Thus with four relays as shown in fig 17.2 complete overcurrent protection can be provided. Relay settings, coordination curves, and settings tables are discussed in detail. The protection of parallel feeder requires to use directional relays and to grade the time setting of relay for selective tripping. KEYWORDS: differential protection, transformer protection, motor protection. 17.2 Relay Co-ordination for Earth-fault Relay Example Consider a feeder as shown in fig 17.3 with earth fault relays R 1 and R 2 . In modem relay, the selection of current setting are generally through The current settings of IDMTL relays are generally expressed in terms of plug setting. 17.2 Relay Co-ordination for Earth-fault Relay Example Consider a feeder as shown in fig 17.3 with earth fault relays R1 and R2. relay settings and the selec tion of current transformers are described with examples. In order relays, the plug setting are in discrete steps starting 50% to 200% of the nominal rating of the overcurrent. SESSION 4:€ Feeder Overcurrent Protection •€€ €Protective relaying requirements for radial and looped systems€ •€€ €Elements of feeder protection schemes€ •€€ €High-set, low-set and inverse-timed elements€ •€€ €Various types of overcurrent relays€ •€€ €Relay setting criteria€ The relay coordination and setting calculation for a case study substation is applied to clear faulty feeder. Relay R1 is used for providing protection against earth fault at the secondary side of 2.5MVA, 11/3.3kV transformer, whereas, relay R2 has to provide protection at bus B. COURSE PART 4 II HOW TO ENTER SETTING TO PROTECTION FUNCTION II PCM 600 REF615 4.0 FP1 IEC, Feeder Protection Relay, Point List Manual, IEC 60870-5-103 ABB Library - All Categories REF615 5.0 FP1 IEC, Feeder Protection Relay, Point List Manual, Modbus (engelska - pdf - The simulation is done in ETAP software. This manual addresses the protection and control engineer responsible for planning, pre-engineering and engineering. (Ps) for the older relays or Iset for the newes relays. Two CTs are used for protection. 1MRS756378 Section 1 Introduction REF615 7 Application Manual This is due to an uncoordinated protection relay on each feeder. The protection and control engineer must be experienced in electrical power engineering and have knowledge of related technology, such as communication and protocols. The excel sheet of the coordination settings also is attached. In this video we have explained calculation for IDMT over current relay setting calculation. A recommendation for the selection of current transformers is also given. There are two feeders connected in parallel from source to load. 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