The current settings of IDMTL relays are generally expressed in terms of plug setting. Thus with four relays as shown in fig 17.2 complete overcurrent protection can be provided. The protection and control engineer must be experienced in electrical power engineering and have knowledge of related technology, such as communication and protocols. A recommendation for the selection of current transformers is also given. Relay settings, coordination curves, and settings tables are discussed in detail. Two CTs are used for protection. The simulation is done in ETAP software. This manual addresses the protection and control engineer responsible for planning, pre-engineering and engineering. 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€ (Ps) for the older relays or Iset for the newes relays. 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. The protection of parallel feeder requires to use directional relays and to grade the time setting of relay for selective tripping. In this video we have explained calculation for IDMT over current relay setting calculation. Both of the feeders have non-directional over current relay at source end. 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 - In order relays, the plug setting are in discrete steps starting 50% to 200% of the nominal rating of the overcurrent. 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 . The relay coordination and setting calculation for a case study substation is applied to clear faulty feeder. 1MRS756378 Section 1 Introduction REF615 7 Application Manual KEYWORDS: differential protection, transformer protection, motor protection. In modem relay, the selection of current setting are generally through relay settings and the selec tion of current transformers are described with examples. There are two feeders connected in parallel from source to load. 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