Flow chart of overcurrent relay setting. Calculate the actual operating time of relay 2 ( ) using equation(17) = ∗ + .....17 Step 13. Transformer Data : 8 MVA , 6.6KV/ 415 , Impedance = 0.0835 p.u., Tap + 10% ( 440Kv – 360KV. Table 2 details the calculations associated with setting of overcurrent relays. function definition list, or relay-setting record. REF relay setting calculation REF RELAY SETTING CALCULATION. November 19, 2020 at 11:21 am on your email. 26! The relay at C has a time delay setting equal to t 1 seconds, and similarly for the … IDMT Relay High Current setting :Plug setting of Relay is 2.5 Amp and Time Delay (TMS) is 0.100 Sec, Relay Curve is selected as Normal Inverse Type; Calculation of Over Current Relay Setting: (1) Low over Current Setting: (I>) Over Load Current (In) = Feeder Load Current X Relay setting = 384 X 125% =480 Amp Search Search Relay Setting Calculation rev.1.pdf - Free download as PDF File (.pdf), Text File (.txt) or read online for free. • Speed is necessary for two main reasons – Maintain stability of the overall power system Now ideally, one can set the pick up current of the overcurrent relay anywhere within the maximum feeder load current (column 2) and minimum fault should not allow PSM … The angle of Z 0,Relay and Z 2,Relay is the source of determining the direction to a fault. Reply. See Annex A for further discussion and examples. Relay : CAG 14 / … Scribd is the world's largest social reading and publishing site. Sample calculation-for-differential-relays 1. Fatima. Er. Timeliness - Speed • Faults must be isolated as fast as possible. 2.1 Differential Relay Settings Calculations MiCOM P63X Relay Type: MICOM P63X Required Data Ratings of the Power and Current Transformers MVA Voltage Ratio Rated Voltage in kV (HV Side) Rated Voltage in kV (LV Side) Vector Group CT … Differential Relays 2. o Inver se No figure 2. the impedance seen by the relay will be dependent solely upon the source impedance. For that, we have to first divide primary faulty current by CT ratio to get relay … Reply. Relay setting data. It shows both the minimum fault current and the maximum load current. (The dependency on source impedance might be counter-intuitive to engineers accustomed to setting impedance relays in terms of line impedances.) CTR = 800 /1. After the time delay has expired, the relay output contact closes to trip the circuit breaker. or so) thereby preventing mechanical damage/breakdown. i am looking at REM 615 – motor protection relay setting calculations, stuck up at relay/motor curve (hot/cold)? Field data Relay current ( ) Using 6 6Eq.63.35 Plug setting multiplier (PSM) Using Eq.8 Actual time of operation using Eq.3.41 Relay Setting Data • Relays are set to operate depending on the time and current characteristics – Unit systems • Current is measured at several points and compared. August 28, 2019 at 4:59 pm Please share some relay setting calculations excels ,pdf or doble or RIO test kit calculation files if you have any … A low set overcurrent protection in "run" condition facilitates setting of locked rotor protection at very low values (say 150% for 2 sec. Relay - Relay coordination requires (1) that there be a … Relay settings: Availability of a comprehensive relay demands proper selection of the settings so that all protections offered are … Overcurrent device settings are chosen to provide an acceptable compromise between sensitivity and selectivity in overcurrent protection. nk. Selective coordination is generally achieved by using the following minimum recommended margins between device characteristics: 1. The relay at B is set at the shortest time delay possible to allow the fuse to blow for a fault at A on the secondary side of the transformer. Say current setting of the relay is 150 % therefore pick up current of the relay is 1 × 150% = 1.5 A. Step-3 Now we have to calculate PSM for the specified faulty current level. 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