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MRU3-1

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AC voltage relay

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Summary of Contents for MRU3-1

Page 1: ...MRU3 1 AC voltage relay...

Page 2: ...only 5 5 Parameter for the fault recorder 5 5 1 Adjustment of the fault recorder 5 5 2 Number of the fault recordings 5 5 3 Adjustment of trigger occurences 5 5 4 Pre trigger time Tpre 5 6 Date and t...

Page 3: ...Features and characteristics Microprocessor technology with watchdog digital filtering of the measured values by using dis crete Fourier analysis to suppress higher harmonics and d c components induc...

Page 4: ...asuring circuits are shown in the connection diagram The analog input voltages are galvanically decoupled by the input transformers of the device then filtered and finally fed to the analog digital co...

Page 5: ...riting over If 2 4 or 8 recordings are chosen the complete memory is divided into the relevant number of partial segments If this max number of fault event has been exceeded the fault recorder block a...

Page 6: ...rameters for the fault recorder FR Number of disturbance events FR Trigger events FR Pre trigger time Tvor Date and time Year Y 00 Month M 04 Day D 18 Hour h 07 Minute m 59 Second s 23 Additional func...

Page 7: ...ting values for all parameters are stored in a parameter memory EEPROM Electrically Erasable Programmable Read Only Memory so that the actual relay settings cannot be lost even if the power supply is...

Page 8: ...elta connection D 7 7 7 Sec winding of mains V T Figure 4 2 Input v t s in star connection Y 4 4 Blocking function No Dynamic Behaviour U U 1 voltage to external blocking input is ap plied free pro gr...

Page 9: ...e time for each value U tU rated frequency setting value in Hz SELECT RESET fN U U 1 phase 3 phase U 1 U 3 SELECT RESET 1 3 Blocking function EXIT until max setting value until min setting value LED o...

Page 10: ...an 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 Table 5 2 Declin...

Page 11: ...d as parameter set change over switch With the setting R_S2 the reset input D8 E8 is used as pa rameter set change over switch With the setting B_FR the fault recorder is activated immediately by usin...

Page 12: ...this ad justment the LED RS lights up 5 4 4 Setting of Baud rate applies for Modbus Protocol only Different transmission rates Baud rate can be set for data transmission via Modbus Protocol The rate...

Page 13: ...failures min 6 minutes Note The window for parameter setting is located behind the measured value display The parameter window can be accessed via the SELECT RESET key 5 7 Indication of measuring valu...

Page 14: ...the latest fault data set recorded At the same time the pa rameter set active at the occurence is shown By pressing SELECT RESET the fault measuring values can be scrolled By pressing it can be scroll...

Page 15: ...LECT RESET in blocking mode again the assignment mode is selected The relays are assigned as follows LEDs U U U and U are two coloured and light up green when the output relays are assigned as alarm r...

Page 16: ...be reset when the pickup is not present anymore otherwise TRIP remains in display During resetting of the display the parameters are not affected 5 9 3 Erasure of fault storage To delete the trip stor...

Page 17: ...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 t...

Page 18: ...gu 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 2 Example of the test circuit For testing of the MRU3 1...

Page 19: ...n must not exceed 1 of the set operating value Furthermore gradually decrease increase the volt ages until the relay resets i e the voltage alarm output relay is disengaged Check that the dropout to p...

Page 20: ...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 21: ...ime lag error class index E 10 ms Minimum operating time 30 ms Max allowed interruption of the auxiliarxy supply without effecting the function of the device 50 ms Influences on voltage measuring Aux...

Page 22: ...0 V 2 200 V EXIT UN 230 V 2 460 V EXIT UN 400 V 4 800 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 or 15 ms 7 3 1 Interface parameter Function Para...

Page 23: ...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 24: ...ernal triggering for the fault recorder SET1 Protection parameter Function Unit Default settings Set 1 Set 2 Actual settings Set 1 Set 2 1 3 1 phase 3 phase tripping U 1 U Pickup value for undervoltag...

Page 25: ...the minute minute m 00 Clock Setting of the second second s 00 Blocking function Default settings Actual settings Blocking Not blocking Blocking Not blocking Parameter set Set 1 Set 2 Set 1 Set 2 Set...

Page 26: ...Plugged Not plugged X No function X Code jumper Low High range for reset input Low High range for blockage input Default settings Actual settings Default settings Actual settings Low plugged X X High...

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