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