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MRU3-2

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Voltage relay with evaluation of symmetrical

components

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Summary of Contents for HighTECH MRU3-2

Page 1: ...MRU3 2 Voltage relay with evaluation of symmetrical components...

Page 2: ...e slave address 5 4 7 Setting of Baud rate applies for Modbus Protocol only 5 4 8 Setting of parity applies for Modbus Protocol only 5 5 Parameter for the fault recorder 5 5 1 Adjustment of the fault...

Page 3: ...nd undervolt age and positive sequence system overvoltage detection in negative and zero se quence system display of measuring values of the line voltages and system voltages U0 U1 and U2 as rms value...

Page 4: ...Relais 1 Relay 1 Relais 2 Relay 2 Relais 3 Relay 3 Relais 4 Relay 4 L1 L2 L3 t U A B C a b c tU1 tU1 tU2 tU0 U1 U1 U2 U0 A3 A5 A7 A8 Serielle Schnittstelle Serial Interface N G P N G P SELECT RESET EN...

Page 5: ...ter the supply voltage had been applied 3 1 3 External reset input Refer to chapter 5 9 2 3 1 4 Output relays The MRU3 2 is equipped with 5 output relays Relay 1 C1 D1 E1 and C2 D2 E2 Relay 2 C3 D3 E3...

Page 6: ...D Flash Suppression of LED flashing after activation P2 FR Parameter switch external trigger for the fault recorder Protection parameters 1 3 1 phase or 3 phase U U tripping U Pickup value for undervo...

Page 7: ...of the unit The LED marked with FR lights up during parameter setting at the fault recorder When LED lights up date and time are displayed LED PS indicates the phase sequence The 9 LEDs below the SEL...

Page 8: ...sed by fault induced transients or other system dis turbances The microprocessor continuously compares the measured values with the preset thresholds stored in the parameter memory EEPROM If a fault o...

Page 9: ...hase has fallen short of the tripping value U Activation cum tripping takes place if all three phases have exceeded the tripping value U Activation cum tripping takes place if one phase has exceeded t...

Page 10: ...the negative direc tion so called left rotating field consists only of a negative sequence system A measure for the size of the asymmetry of the original system represents the re sidual voltage in the...

Page 11: ...must be multiplied by 1 3 In this example the sum equals zero Conclusion the source system is symmet rical 4 4 5 System with voltage unbalance Figure 4 4 Graphical determination of the negative sequen...

Page 12: ...of the shifting results from re placing this system in symmetrical components in the developed zero sequence system Note Shall the relay evaluate the zero sequence system it is absolutely necessary t...

Page 13: ...RESET one time for each value U tU positive phase sequence system un dervoltage U1 trip delay tU1 Setting value in volt Setting value in seconds SELECT RESET one time for each value U1 tU1 positive p...

Page 14: ...1 h 12 m 2 s 12 SELECT RESET Software version First part e g D02 Second part e g 6 01 TRIP one time for each part Manual trip TRI TRIP three times Inquire password PSW SELECT RESET ENTER Relay tripped...

Page 15: ...ltage value can be correctly meas ured between 40 Hz and 70 Hz without adverse ef fects from the frequency With the setting f 50 60 Hz the measured voltage value is influenced by the frequency see Tab...

Page 16: ...is used as parameter set change over switch With the setting R_S2 the reset input D8 E8 is used as para meter set change over switch With the setting B_FR the fault recorder is activated immediately b...

Page 17: ...al under over voltage settings Both elements can be blocked or set as alarm stages 5 4 4 Negative sequence system overvoltage U2 This parameter determines the treshold for the rms value of the negativ...

Page 18: ...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 During the recordi...

Page 19: ...SELECT RESET the display switches cyclically to the next value After the measuring values had been indicated the setting pa rameters are displayed Hereby the LEDs in the upper section signalize which...

Page 20: ...any case the assignment has to be met which phase sequence shall correspond to the positive sequence system Display 123 means that the connected rotating field has the positive sequence system of uni...

Page 21: ...s shown By pressing SELECT RESET the fault measuring values can be scrolled By pressing it can be scrolled back to a more recent fault data set At first FLT8 FLT7 are al ways displayed When fault reco...

Page 22: ...in the assignment mode The assignment mode can be reached only via the blocking mode By pressing push button SELECT RESET in blocking mode again the assignment mode is selected The relays are assigne...

Page 23: ...the parameters are not affected 5 9 3 Erasure of fault storage To delete the trip store the push button combination SELECT RESET and has to be pressed for about 3s The display shows wait Relay functio...

Page 24: ...he circuit breaker if tripping is not desired By pressing the push button TRIP once the display shows the first part of the software version of the relay e g D08 By pressing the push button TRIP twice...

Page 25: ...u lation Voltage adjustable from 0 to 2 x UN Timer to measure the operating time Accuracy class 10 ms Switching device Test leads and tools 6 4 1 Example of the test circuit For testing of the MRU3 2...

Page 26: ...and the theoretical value accept to the table Symmetrical measuring voltage system For this test the relay has to be correctly connected with all of the three phases and the star point If the measuri...

Page 27: ...function or smaller than 1 03 for undervoltage 6 4 5 Checking the relay operating time of the over undervoltage functions To check the relay s operating time a timer must be connected to the trip outp...

Page 28: ...he relay works and measures correctly 6 6 Maintenance Maintenance testing is generally done on site at regu lar intervals These intervals vary among users depend ing on many factors e g the type of pr...

Page 29: ...error class index E 10 ms Minimum operating time 40 ms Max allowed interruption of the auxiliarxy supply without effecting the function of the device 50 ms Weight approx 1 5 kg Mounting position any I...

Page 30: ...800 V EXIT 0 04 50 s EXIT 1 V 1 V 2 V 0 01 0 02 0 05 0 1 0 2 0 5 1 0 2 0 s 1 of set value or 0 3 UN 1 oder 15 ms U U U U1 tU tU1 tU1 UN 100 V 2 200 V EXIT UN 230 V 2 460 V EXIT UN 400 V 4 800 V EXIT 0...

Page 31: ...x 8 s 3 4 x 4 s 7 8 x 2 s 50 Hz 1 2 x 6 66 s 3 4 x 6 66 s 7 8 x 1 66 s 60 Hz FR Savings of the recording at the occurence P_UP TRIP A_PI TEST FR Pre trigger time 0 05 s 8 00 s is written over when a...

Page 32: ...asuring of the positive phase sequence negative phase sequence and zero phase sequence system component 1 2 Rated voltage 100 V 230 V 400 V 1 2 4 Housing 12TE 19 rack Flash mounting A D RS 485 Alterna...

Page 33: ...lue for undervoltage element V 80 190 320 tU Tripping delay for undervoltage element s 0 04 U Pickup value for overvoltage element V 110 250 440 tU Tripping delay for overvoltage element s 0 04 U Pick...

Page 34: ...king function Default setting Actuala setting Blocking Not blocking Blocking Not blocking Parameter set Set 1 Set 2 Set 1 Set 2 Set 1 Set 2 Set 1 Set 2 U X X U X X U X X U X X U1 X X U1 X X U2 X X U0...

Page 35: ...lugged Not plugged X No function X Code jumper Low High range for reset input Low High range for blockage input Default settings Actual settings Werkseinstellung Eigene Einstellung Low plugged X X Hig...

Page 36: ...36 TB MRU3 2 12 00 E...

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