From current setting we calculate the trick current of the relay. 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 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 Selective coordination is generally achieved by using the following minimum recommended margins between device characteristics: 1. Flow chart of overcurrent relay setting. 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 … Relay settings: Availability of a comprehensive relay demands proper selection of the settings so that all protections offered are … A low set overcurrent protection in "run" condition facilitates setting of locked rotor protection at very low values (say 150% for 2 sec. • Speed is necessary for two main reasons – Maintain stability of the overall power system 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. Fatima. i am looking at REM 615 – motor protection relay setting calculations, stuck up at relay/motor curve (hot/cold)? Reply. Relay : CAG 14 / … Calculate the actual operating time of relay 2 ( ) using equation(17) = ∗ + .....17 Step 13. Search Search the impedance seen by the relay will be dependent solely upon the source impedance. November 19, 2020 at 11:21 am on your email. Relay - Relay coordination requires (1) that there be a … Relay Setting Calculation rev.1.pdf - Free download as PDF File (.pdf), Text File (.txt) or read online for free. See Annex A for further discussion and examples. For that, we have to first divide primary faulty current by CT ratio to get relay … 26! The angle of Z 0,Relay and Z 2,Relay is the source of determining the direction to a fault. function definition list, or relay-setting record. It shows both the minimum fault current and the maximum load current. Differential Relays 2. CTR = 800 /1. REF relay setting calculation REF RELAY SETTING CALCULATION. Timeliness - Speed • Faults must be isolated as fast as possible. After the time delay has expired, the relay output contact closes to trip the circuit breaker. Overcurrent device settings are chosen to provide an acceptable compromise between sensitivity and selectivity in overcurrent protection. The relay at C has a time delay setting equal to t 1 seconds, and similarly for the … Transformer Data : 8 MVA , 6.6KV/ 415 , Impedance = 0.0835 p.u., Tap + 10% ( 440Kv – 360KV. Sample calculation-for-differential-relays 1. or so) thereby preventing mechanical damage/breakdown. Relay setting data. 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. • Relays are set to operate depending on the time and current characteristics – Unit systems • Current is measured at several points and compared. Er. (The dependency on source impedance might be counter-intuitive to engineers accustomed to setting impedance relays in terms of line impedances.) nk. Table 2 details the calculations associated with setting of overcurrent relays. •On a side note the Standards stated: If only two relatively important functions are performed by the device, it is preferred that both function numbers be used, as described in 3.7 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 … 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 … o Inver se No figure 2. Reply. Scribd is the world's largest social reading and publishing site. Will be dependent solely upon the source of determining the direction to a fault Faults must be isolated fast! + relay setting calculation ppt 17 Step 13 17 Step 13 be dependent solely upon source! 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