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MRF3

- Frequency Relay

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Summary of Contents for MRF3

Page 1: ...MRF3 Frequency Relay...

Page 2: ...ocol only 5 4 13 Setting of parity applies for Modbus Protocol only 5 5 Parameter for the fault recorder 5 5 1 Adjustment of the fault recorder 5 5 2 Type of fault recorder 5 5 3 Number of the fault r...

Page 3: ...as been exceeded or fallen short of display of all measuring values and setting parame ters for normal operation and tripping via an alpha numerical display and LEDs display of actual measuring values...

Page 4: ...4 TB MRF3 04 01 E 3 Design 3 1 Connections Figure 3 1 Connection diagram MRF3 Note Phase voltages can also be connected to A3 A4...

Page 5: ...put relays The MRF3 has 5 output relays with change over con tacts Output relay 1 C1 D1 E1 and C2 D2 E2 Output relay 2 C3 D3 E3 and C4 D4 E4 Output relay 3 C5 D5 E5 Output relay 4 C6 D6 E6 Output rela...

Page 6: ...of subranges If the maximal number of fault events has been recorded further recordings are blocked by the fault recorder in order to save the stored data After these have been read out and erased the...

Page 7: ...or df dt stage 1 With setting vari two new parame ters appear which fix a trip window for the df dt fe df1 min Bottom frequency threshold value for the df dt stage 1 fe df1 max Top frequency threshold...

Page 8: ...below the SELECT RESET push button light up green during setting and reading out the set ting values printed on the left side next to the LEDs The LEDs light up red when the setting values printed on...

Page 9: ...values setting value stored in the parameter memory EPROM If a fault occurs an alarm is given and after the set tripping delay has elapsed the corresponding tripping relay is activated The relay sett...

Page 10: ...dt The amount of power deficit can be determined by way of the frequency change speed and this way appropriate load shed ding can be initiated The conventional method of supervising the frequency grad...

Page 11: ...edding For thresholds fe and fT this frequency timer is con nected in series as measuring repetition timer as de scribed for frequency elements f1 f4 see chapter 5 4 2 Thus Figure 4 3 only applies whe...

Page 12: ...setting value in seconds SELECT RESET one time for each value one time for each value one time for each value f3 f3 R tf3 tf3 tR green green red red Frequency pickup value f4 Reclaim value for f4 tri...

Page 13: ...llow Frequency changing speed Tripping value in Hz s SELECT RESET df dfmin dfmax Fault memory FLT1 FLT2 SELECT RESET U f fmin fmax df dfmin dfmax tf1 tf4 dt1 dt2 red yellow red red green Delete failur...

Page 14: ...able multiplier see also chapter 5 4 4 During setting of the nominal frequency a value in Hz is shown on the display 5 3 3 Display of the activation storage FLSH NOFL If after an activation the existi...

Page 15: ...ion Dependent on the preset nominal frequency fN the pickup values from 30 Hz up to 70 Hz at fN 50 Hz and from 40 Hz to 80 Hz at fN 60 Hz can be set During setting of the pickup values f1 f4 the displ...

Page 16: ...it is possible to detect an impermissible frequency increase as well as a drop in frequency Measuring repetition counters dt1 and dt2 are for checking the monotony of the frequency increase or decrea...

Page 17: ...2 s f df S 2L 2 x 64 s 2 x 53 2 s S 4L 4 x 32 s 4 x 26 4 s no S 8L 8 x 16 s 8 x 13 2 s 5 5 4 Adjustment of trigger occurences There is a choice between four different occurences P_UP PickUP Storage i...

Page 18: ...ESET again If the SELECT RESET key is actuated again the blocking menu is left and the assignment mode is accessed Function Description Display LED f1 Frequency step 1 BLOC green f2 Frequency step 2 B...

Page 19: ...can now be assigned to this voltage element as tripping relays Relays 1 4 are selected in the same way as de scribed before By repeatedly pressing of the SELECT RESET push button and assignment of th...

Page 20: ...are written into the min max storage Hereby only a new minimum or maximum value overwrites older stored values According to the setting of T and the tripping delay it can happen that the stored min m...

Page 21: ...relay is still in trip condition and not yet reset TRIP is still displayed no measuring values can be shown To delete the trip store the push button combina tion SELECT RESET and has to be pressed for...

Page 22: ...lay reset of the relay Display Applying the system volt age to the frequency measuring input active after 1 5 s active after 1 5 s active after 1 5 s active after 1 5 s Applying a voltage UB to the fr...

Page 23: ...nals D7 and E7 closed 6 2 Testing the output relays NOTE Prior to commencing this test interrupt the tripping cir cuit to the circuit breaker if tripping is not desired By pressing the push button TRI...

Page 24: ...e adjustable from 0 to 2 x UN Frequency adjustable from 40 70 Hz Timer to measure the operating time Accuracy class 10 ms Switching device Test leads and tools 6 4 2 Test circuit For testing MRF3 the...

Page 25: ...enerate a definite frequency gradient 6 4 6 Checking the tripping delays For checking the tripping delays tf a voltage source is needed which changes the frequency in a defined quantity at a certain t...

Page 26: ...rify that the 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...

Page 27: ...error class index E 10 ms Minimum operating time 30 ms Max allowed interruption of the auxiliary supply without influence to the function of the device 50 ms Influences on frequency measuring Aux vol...

Page 28: ...00s 0 1 0 01 Hz 0 1 0 01 Hz 0 02 0 05 0 1 0 2 0 5 1 0 2 0 s 0 02 0 05 0 1 0 2 0 5 1 0 2 0 5 0 10s 0 005 Hz 0 005 Hz 1 bzw 20 ms Thresholds and tripping val ues for df dt measuring fe df1 40 49 999 VAR...

Page 29: ...TB MRF3 04 01 E 29 7 4 Order form Frequency relay MRF3 Rated voltage 100 V 230 V 400 V 1 2 4 Housing 12TE 19 rack Flush mounting A D Technical data subject to change without notice...

Page 30: ...delay of the third frequency element s 0 1 f3 R Reclaim value of the third frequency stage Hz 50 99 tf3 tR Reclaim time of the third frequency stage s 0 06 f4 Pickup value of the fourth frequency elem...

Page 31: ...00 Blocking function Default settings Actual settings Blocking Not blocking Blocking Not blocking Parameter set Set 1 Set 2 Set 1 Set 2 Set 1 Set 2 Set 1 Set 2 f1 X X f2 X X f3 X X f4 X X df dt1 X X...

Page 32: ...t tings Actual set tings 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 setti...

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