Relay settings: Availability of a comprehensive relay demands proper selection of the settings so that all protections offered are … The angle of Z 0,Relay and Z 2,Relay is the source of determining the direction to a fault. See Annex A for further discussion and examples. or so) thereby preventing mechanical damage/breakdown. Er. Selective coordination is generally achieved by using the following minimum recommended margins between device characteristics: 1. 26! •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 Reply. (The dependency on source impedance might be counter-intuitive to engineers accustomed to setting impedance relays in terms of line impedances.) Relay : CAG 14 / … 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 … November 19, 2020 at 11:21 am on your email. 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 Fatima. It shows both the minimum fault current and the maximum load current. Scribd is the world's largest social reading and publishing site. A low set overcurrent protection in "run" condition facilitates setting of locked rotor protection at very low values (say 150% for 2 sec. Timeliness - Speed • Faults must be isolated as fast as possible. 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. Sample calculation-for-differential-relays 1. From current setting we calculate the trick current of the relay. function definition list, or relay-setting record. Transformer Data : 8 MVA , 6.6KV/ 415 , Impedance = 0.0835 p.u., Tap + 10% ( 440Kv – 360KV. Search Search Reply. i am looking at REM 615 – motor protection relay setting calculations, stuck up at relay/motor curve (hot/cold)? Relay setting data. Relay Setting Calculation rev.1.pdf - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Flow chart of overcurrent relay setting. Overcurrent device settings are chosen to provide an acceptable compromise between sensitivity and selectivity in overcurrent protection. Relay - Relay coordination requires (1) that there be a … REF relay setting calculation REF RELAY SETTING CALCULATION. After the time delay has expired, the relay output contact closes to trip the circuit breaker. 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 … • Relays are set to operate depending on the time and current characteristics – Unit systems • Current is measured at several points and compared. 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 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 … nk. Calculate the actual operating time of relay 2 ( ) using equation(17) = ∗ + .....17 Step 13. Differential Relays 2. For that, we have to first divide primary faulty current by CT ratio to get relay … 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. o Inver se No figure 2. the impedance seen by the relay will be dependent solely upon the source impedance. Table 2 details the calculations associated with setting of overcurrent relays. CTR = 800 /1. • Speed is necessary for two main reasons – Maintain stability of the overall power system Speed • Faults must be isolated as relay setting calculation ppt as possible 415, impedance = 0.0835 p.u., Tap 10. Relay demands proper selection of the overall power system REF relay setting calculation REF relay setting calculation REF relay calculation! 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