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MRN3-3

PROTECTION TECHNOLOGY
MADE SIMPLE

MAINS DECOUPLING RELAY WITH DF/DT AND

PROGRAMMABLE UNDERVOLTAGE CHARACTERISTICS

HighTECH Line

MAINS DECOUPLING RELAY WITH DF/DT

AND PROGRAMMABLE UNDERVOLTAGE CHARACTERISTICS

Original document

English

Revision: A

MANUAL

Summary of Contents for HighTECH Line MRN3-3

Page 1: ...MADE SIMPLE MAINS DECOUPLING RELAY WITH DF DT AND PROGRAMMABLE UNDERVOLTAGE CHARACTERISTICS HighTECH Line MAINS DECOUPLING RELAY WITH DF DT AND PROGRAMMABLE UNDERVOLTAGE CHARACTERISTICS Original docum...

Page 2: ...etting parameters for under voltage characteristics 5 4 2 SYMmetrical ASYMmetrical or GENEral faults 5 4 3 Permissible release time for the under voltage characteristic curve 5 4 4 Plausibility check...

Page 3: ...ns 6 5 4 Checking the operating and resetting values of the over underfrequency functions 6 5 5 Checking the tripping delay of the over underfrequency functions 6 5 6 Checking the vector surge functio...

Page 4: ...been applied for the first time in protection technique is of enormous use for the accu rate identification and analysis of the grid state as demanded by the rules General Note For further technical d...

Page 5: ...ccording to re quirement By applying the auxiliary voltage to D8 E8 the previously set relay functions are blocked refer to 4 8 and 5 7 1 3 1 3 Reset input Please refer to chapter 5 9 1 3 1 4 Output r...

Page 6: ...cordings are chosen the relevant num ber of partial segments is reserved in the complete memory If the memory is full a new recording will always write over the oldest one Thus the fault recorder can...

Page 7: ...t curve 1 warn Display shows no TRIP trip Display shows TRIP Char1 U 1 1 Char point_value 1 voltage value V 1 U Start 2 U Start Char1 U 1 t 1 Char point_value 2 not parameterisable s 0s fixed Char1 U...

Page 8: ...voltage element V 1 200 1 460 4 800 tU2 U2 t Tripping time of the 2 nd voltage element s 0 04 290 U3 Function of the 3 rd voltage element U undervoltage U overvoltage U3 Pick up value of the 3 rd vol...

Page 9: ...P2 and RS min and max are two coloured The LEDs on the left side next to the alphanumerical display light up green during measur ing and red during fault message The LEDs below the push button SELECT...

Page 10: ...ompo nents caused by fault induced transients or other system disturbances The microprocessor continuously com pares the measured values with the preset thresholds stored in the parameter memory EEPRO...

Page 11: ...generators consumers or electrical operating equip ment in general against over or underfrequency The relay has three independent frequency elements f1 f3 with individually adjustable parameters with...

Page 12: ...protects the generator by tripping the generator circuit breaker in case of mains failure b Mains parallel operation and isolated single operation For this application the vector surge supervision tr...

Page 13: ...verfunctions MRN3 3 should be connected separately to the busbar 4 7 Measuring principle of vector surge supervision When a synchronous generator is loaded a rotor dis placement angle is build between...

Page 14: ...stable reference time and from this the deviation of the cycle duration of the voltage signal is ascertained In case of a vector surge as shown in fig 4 8 the zero passage occurs either earlier or lat...

Page 15: ...st load change causing a vector surge and trips the mains C B For detecting high resistance mains failures a minimum current relay with an adjustable trip delay can be used A trip delay is needed to a...

Page 16: ...ased Instantaneously released released instantane ously released after 1 s Released after 5 s released after 5 s 3 supply voltage is switched on blocked for 200 ms blocked for 200 ms blocked for 1 s b...

Page 17: ...value in seconds SELECT RESET one time for each value Char1 U 5 Char1 U 5 t Permissible release time for under voltage limit curve 1 Setting value in seconds SELECT RESET one time for each value Char...

Page 18: ...tive function Voltage threshold value for the frequency vector surge and df dt measurement setting value in Volt SELECT RESET f df Slave address of serial interface 1 32 SELECT RESET RS Baud Rate 1 12...

Page 19: ...rameter the transformation ratio of the VT has to be set accordingly If the parameter is set to sec the measuring value indicated on the dis play is shown as rated secondary voltage Example The voltag...

Page 20: ...or f 60 Hz The different designations f or v have no influence on any of the other functions All frequency functions are determined by setting the nominal frequency i e whether the set frequency thres...

Page 21: ...order Figure 5 3 Function of digital inputs With the settings SET1 or SET2 the parameter set is acti vated by software Terminals C8 D8 and D8 E8 are then available as external reset input or blocking...

Page 22: ...rts as soon as the failure occurs A fault in cident is detected when the voltage is below the threshold value U start and it will be stopped as soon as the voltage range U 5 had been exceeded At the m...

Page 23: ...and the MRN3 3 detects a symmetrical fault then tripping will be blocked ALL means general fault If this function is assigned to an under voltage characteristic and the MRN3 3 de tects a fault then t...

Page 24: ...marked accordingly in red 5 4 4 Plausibility check of the voltage characteristic The setting points are not independent from each other It is therefore recommended to parameterise them in ascending o...

Page 25: ...value adjusted at T alarm is given and after the tripping delay of the frequency element has elapsed the tripping command is given The setting range for T is between 2 99 Recommendation for setting Fo...

Page 26: ...ation Switching off and on of loads approx 20 of the nominal generator capacity must trip the relay Later in normal isolated operation the tripping of the relay is inhibited b In mains parallel operat...

Page 27: ...ault recorder see chapter 3 1 5 Three parameters can be determined 5 5 1 Number of the fault recordings The max recording time is 20 s at 50 Hz or 16 66 s at 60 Hz The number of max recordings request...

Page 28: ...can be changed and with ENTER be saved 5 6 Adjustment of the clock When adjusting the date and time LED lights up The adjustment method is as follows Date Year Y 00 Month M 00 Day D 00 Time Hour h 00...

Page 29: ...how ever only 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 LEDs...

Page 30: ...U1 t tripping X 1 _ _ _ U1 green t red U2 alarm X _ _ _ 4 U2 green U2 t tripping X 1 _ _ _ U2 green t red U3 alarm X _ _ _ 4 U3 green U3 t tripping X 1 _ _ _ U3 green t red f1 alarm X _ _ _ 4 f1 green...

Page 31: ...ositive and negative df dt values occur but they do not cause any tripping due to the special measuring method These min max measurements are of great advan tage for long time analysis of the grid qua...

Page 32: ...time the pa rameter set that is active at the occurrence is 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 se...

Page 33: ...of a protection function The display can only 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 2 Er...

Page 34: ...ternal blocking input terminals E8 D8 to inhibit the undervoltage functions and press the SELECT RESET for app 3 s to reset the LEDs and TRIP message 6 2 Testing the output relays and LEDs PLEASE NOTE...

Page 35: ...t where three phase voltages are ap plied to the relay in Y connection MRN1 Versorgung Supply Versorgung Supply L L L N C9 E9 D9 Extern Reset External Reset Blockiereingang Blocking Input L L C8 L N D...

Page 36: ...ent of the input signals the har monics will be rejected by the internal DFFT digital fil ter Whereas the RMS metering instrument measures the RMS value of the input signals 6 5 2 Checking the operati...

Page 37: ...ckup values f1 f3 to EXIT For testing the pickup and dropout to pickup values the test frequency has to be increased decreased until the relay is energised This is indi cated by lighting up of LEDs f1...

Page 38: ...hase angle obtained may be calculated with the following formula and is almost independent on the test voltages In case of a 3 phase vector surge the angle can be calculated with the following formula...

Page 39: ...t Generally a primary injection test could be carried out in the similar manner as the secondary injection test described above With the difference that the pro tected power system should be in this c...

Page 40: ...f 99 96 f 100 04 Dropout time 60 ms Time lag error class index E 10 ms Minimum operating time 40 ms Max allowed interruption of the auxiliary supply without a facting the function of the device 50 ms...

Page 41: ...har 2 warn trip Voltage characteristics Char1 Char2 U Start Un 100 V EXIT 1 200 V Un 230 V EXIT 1 460 V Un 400 V EXIT 4 800 V Un 690 V EXIT 4 800 V 1 V 1 V 2 V 2 V 1 from setting value or 0 3 of UN U...

Page 42: ...from setting value or 0 3 of UN tU 5 U 5 t tU 4 60s 0 02 0 06 1 00 0 05 1 00 2 00 0 1 2 00 5 00 0 2 5 00 10 0 0 5 10 0 20 0 1 20 0 50 0 2 50 0 60 1 related to the measured value of volt age resp 30 m...

Page 43: ...50 01 70 Hz1 40 59 99 EXIT 60 01 80 Hz2 0 01 30 0 48 0 0 1 48 0 52 0 0 01 52 0 70 0 0 01 40 0 58 0 0 1 58 0 62 0 0 01 62 0 80 0 0 04 Hz 1 or 20 ms f1 t f3 t tf min 3 290 s EXIT 0 02 0 06 1 00 0 05 1 0...

Page 44: ...recorder Function Parameter Adjustment example FR Number of recordings 1 x 20 s 1 2 x 10 s 3 4 x 5 s 7 8 x 2 5 s 50 Hz 1 x 16 66 s 1 2 x 8 33 s 3 4 x 4 16 s 7 8 x 2 08 s 60 Hz FR Saving of the record...

Page 45: ...ision 1 step and vector surge 1 step Rated voltage 100 V Utilities Substation main substation 230 V direct connection without transformers 400 V direct connection without transformers 690 V direct con...

Page 46: ...ristic 1 warn U 1 1 Char point_value 1 V 45 104 180 310 1 Char point_value 2 not changeable s U 2 2 Char point_value 1 V 45 104 180 310 U 2 t 2 Char point_value 2 s 0 16 U 3 3 Char point_value 1 V 70...

Page 47: ...or frequency measuring Periods 4 f1 Pick up value for the 1 st frequency step Hz 48 00 f1 t Tripping delay of the 1 st frequency step s 0 1 f2 Pick up value for the 2 nd frequency step Hz 47 50 f2 t T...

Page 48: ...l settings Default settings Actual settings Default settings Actual settings Char 1 cycle running Char 1 trip alarm X Char 2 cycle running X Char 2 trip alarm X U1 alarm X U1 t tripping X U2 alarm X U...

Page 49: ...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 not plugged All settings...

Page 50: ...47884 Kempen Germany Telephone 49 0 21 52 145 1 Internet www SEGelectronics de Sales Telephone 49 0 21 52 145 331 Fax 49 0 21 52 145 354 E mail info SEGelectronics de Service Telephone 49 0 21 52 145...

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