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MRIK3

Time overcurrent relay with auto reclosing relay

Summary of Contents for MRIK3

Page 1: ...MRIK3 Time overcurrent relay with auto reclosing relay...

Page 2: ...1 Display 5 2 Setting procedure 5 3 Systemparameter 5 3 1 Display of measuring values as primary quantities Iprim phase 5 3 2 Display of earth current as primary quantity Iprim earth 5 3 3 Nominal fr...

Page 3: ...ple of test circuit for MRIK3 relays 6 4 3 Checking the input circuits and measured values 6 4 4 Checking the operating and resetting values of the relay 6 4 5 Checking the relay operating time 6 4 6...

Page 4: ...er sets selectable protective functions between definite time overcurrent relay or inverse time overcurrent relay selectable inverse time characteristics according to IEC 255 4 Normal Inverse Type A V...

Page 5: ...TB MRIK3 12 00 E 5 3 Design 3 1 Connections Figure 3 1 Connections MRIK3 I Figure 3 2 Connections MRIK3 IE...

Page 6: ...the C B auxiliary voltage at A5 is checked before a new auto reclosing takes place see also para 4 5 8 External blocking input A3 The unit is blocked when applying voltage to A3 Common point of the i...

Page 7: ...ter the data have been read and deleted the re corder to ready again for further action Writing over If 1 3 or 7 recordings are chosen the relevant number of partial segments is reserved in the comple...

Page 8: ...AR AR status CB Circuit breaker on RS Setting slave address 3 2 2 Setting LEDs P2 Two parameter sets I green pickup value phase current tI red trip delay time multiplier phase current I green pickup...

Page 9: ...age The operating threshold of the signal inputs however has to be de fined by taking the supply voltage into account The fol lowing two different operating thresholds can be ad justed Low range tresh...

Page 10: ...If a phase current exceeds the pickup value an alarm is given and after the set trip delay has elapsed the corresponding trip relay is activated The relay setting values for all parameters are stored...

Page 11: ...gnment of the AR functions it is possible to activate or deactivate a Fast Trip func tion for each AR stage and for each protective function This is applicable for tripping before the 1 st AR up to tr...

Page 12: ...atus transition to ready status when the auto reclos ing takes place status transition to blocked status by external or inter nal blocking The grey shaded sections indicate that no transition is possi...

Page 13: ...tripping command until receiving of the C B check back signal 4 5 5 Unsuccessful reclosing After the start condition has been fulfilled the unit changes to starting status Now the dead time tD is star...

Page 14: ...after an introduced reclosing The C B ready information is checked before an intro duced AR for further ARs There will be a reclosing when the circuit breaker ready had been given before the begin of...

Page 15: ...uit is cleared After expiration of the dead time tD1 unit MRIK3 gives the reclosing command to the circuit breaker If the fault still exists the protection relay trips again and the above mentioned pr...

Page 16: ...ulty lines Unit MRIK3 is in inactive status when the circuit breaker is switched off When the C B is manually closed the reclaim time is started In case there is a faulty line the C B is switched off...

Page 17: ...st trip mode setting value in seconds setting value in seconds setting value in seconds 1ST ALL setting value in seconds 1ST LAST EXIT SELECT RESET one time for each value SHOT tF red tD1 tD2 tD3 tD4...

Page 18: ...RESET I I Normal trip time TIME IE IE Fast trip FAST Running with tD1 tD2 tD3 tD4 Save parameter SAV ENTER Save parameter SAV ENTER for about 3 s Software version First part e g A00 Sec part e g 4 01...

Page 19: ...the existing current drops again be low the pickup value e g I without a trip has been initiated LED I signals that an activation has occured by flashing fast The LED keeps flashing until it is reset...

Page 20: ...CT push button the present time delay setting value is shown on the display The new setting value can then be changed by using push but tons If through a new setting another relay characteristic other...

Page 21: ...ter 5 4 5 5 4 12 Trip delay for high set element of earth fault supervision tIE Similar to the chapter 5 4 6 5 4 13 Parameters auto reclosing Number of AR SHOTS Indicates how often the circuit breaker...

Page 22: ...ping of the relay This protective function becomes only active after tripping and it is then checked whether all phase currents have dropped to 0 within time tCBFP Circuit Breaker Failure Protection S...

Page 23: ...is initiated after a trip has occured A_PI After Pickup Storage is initiated after the last activation threshold was fallen short of TEST Storing is activated by simultaneous actuation of the keys and...

Page 24: ...after the other After selection of the last blocking function renewed pressing of the SELECT RESET pushbutton switches to the assignment mode of the output relays Function Display LED Colour I Overcur...

Page 25: ...ption MR Digital Multifunctional Relays have no function For relays without assignment mode this jump ers are used for parameter setting of alarm relays acti vation at pickup or tripping and manual re...

Page 26: ...will store the altered value Actuation of the SELECT RESET key the protective functions are one after the other assigned to the first AR The following table shows all parameters that have to be set A...

Page 27: ...t of the measuring values displayed The measuring values can optionally be shown in the display as a multiple of the sec rated value x ln or as primary current A According to this the units of the dis...

Page 28: ...ck to a more recent fault data set At first FLT3 FLT2 FLT1 are al ways displayed When fault recording is indicated FLT1 etc the LEDs flash in compliance with the stored trip informa tion i e those LED...

Page 29: ...set The software reset has the same effect as the SELECT RESET push button see also communica tion protocol of RS485 interface The display can only be reset when the pickup is not present anymore othe...

Page 30: ...ion of the relay e g D01 By pressing the push button TRIP twice the display shows the second part of the software ver sion of the relay e g 1 00 The software version should be quoted in all correspond...

Page 31: ...ls B7 B8 and the earth current input Compare the displayed current value with the reading of the amme ter The deviation must not exceed 3 of the measuring value or 1 IN By using an RMS metering instru...

Page 32: ...t on other phases and earth current input circuits in the same manner Note Where test currents 4 x IN are used the thermal with stand capability of the current paths has to be consid ered see technica...

Page 33: ...8 The display and LED indi cations should be reset immediately 6 4 11 Testing the external blocking with Block Trip function In order to simplify things the short circuit stage is to be tested here as...

Page 34: ...ndicate that the relay is ready for auto reclosing Open the circuit breaker manually and check that the LED CB is extinguished immediately to indicate that the circuit breaker is not ready for auto re...

Page 35: ...out to pickup ratio 97 Dropout to pickup ratio for phase current in range 0 2 x IN to 0 5 x IN 100 Returning time 30 ms Time lag error class index E 10 ms Minimum operating time 30 ms Transient overre...

Page 36: ...s 0 05 s 0 1 s 0 2 s 3 from set value or min 1 IN 3 or 10 ms Table 7 1 Setting ranges for time overcurrent protection 7 3 2 Earth fault protection Setting range Step Tolerance Iprim SEK 0 002 50 kA 0...

Page 37: ...0 02 1 Very Inverse Type B t I Is t I s 135 1 Extremely Inverse Type C t I Is t I s 80 2 1 Long Time Inverse s t 1 Is I 120 t I RI Inverse Time s t I I 236 0 339 0 1 t I S RXIDG characteristic s t I I...

Page 38: ...910 20 I IS 0 1 1 10 100 1000 t s tI 0 05 0 1 0 2 0 3 0 4 0 6 0 8 1 0 1 4 2 0 3 0 4 0 6 0 8 0 10 0 Figure 7 2 Very Inverse 1 2 3 4 5 6 7 8 910 20 I IS 0 01 0 1 1 10 100 1000 t s tI 0 05 0 1 0 2 0 3 0...

Page 39: ...5 0 4 0 3 0 2 0 1 0 05 Figure 7 5 Long Time Inverse 1 2 3 4 5 6 7 8 910 20 I IS 0 1 1 10 100 t s tI 8 0 6 0 3 0 4 0 2 0 1 6 1 0 1 4 1 2 10 0 0 8 0 6 0 5 0 4 0 3 0 2 0 1 0 05 Figure 7 6 RXIDG character...

Page 40: ...ted by the C B OFF signal When this time has expired a C B defect is present Energy wait time 200 ms 10 ms During this time the C B stand by is supervised before re closing It can be deactivated by ap...

Page 41: ...3 33 s 7 8 x 1 66 s 60 Hz FR Saving of the recording at the occurence P_UP TRIP A_PI TEST FR Pre trigger time 0 05 s 8 00 s Table 7 8 Parameters for the fault recorder is written over when a new trig...

Page 42: ...th AR MRIK3 3 phase meauring I I I Rated current 1 A 5 A 1 5 Earth current measuring E Rated current in earth path 1 A 5 A 1 5 Housing 12TE 19 rack Flush mounting A D RS485 Alternatively with Modbus P...

Page 43: ...tic overcurrent X X DEFT tI Overcurrent tripping delay s X X 0 03 I tRST Reset mode X X 0 s I Pickup value for high set element IN X X 0 5 tI Tripping delay for high set element s X X 0 03 IE Pickup v...

Page 44: ...Set 2 Blocking the protection function PR_B PR_B PR_B Blocking the trip step TR_B Default setting Actual setting Function Blocking No blocking Blocking No blocking Parameter set Set 1 Set 2 Set 1 Set...

Page 45: ...r the 1 st AR I TIME TIME I TIME TIME IE TIME TIME IE TIME TIME Activation of the 2 nd AR per I NO NO I YES YES IE NO NO IE NO NO Trip after the 2 nd AR I TIME TIME I TIME TIME IE TIME TIME IE TIME TI...

Page 46: ...Blockage Input Default setting Actual setting Default setting Actual setting Low plugged X X High not plugged Code jumper Low High Range for Reset Input Low High Range for the CB OK Input Low high Be...

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