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TB MRF3 04.01 E

5.10

Dynamic behaviour of the relay
functions

The following table shows the dynamic behaviour of
the relay functions under various system conditions.

System condition /

Function

event

df/dt for

load shedding

df/dt for

mains decoupling

Applying auxiliary voltage

active after 1 s

Applying auxiliary voltage
to the external blocking in-
put

not blocked*

Blocked*

Disconneting the auxiliary
voltage from the external
blocking input

no influence

active after 1.5 s

Applying auxiliary voltage
to the external reset input

reset of the relay
(Display)

Applying the system volt-
age to the frequency
measuring input

active after 1.5 s

Applying a voltage <U

the frequency measuring
input

blocked

Applying a voltage with a
frequency <f

to the fre-

quency measuring input

active after 1.5 s

no tripping

Disconnecting system volt-
age from the frequency
measuring input

blocked

Voltage drops below U

B-

min

blocked

Recovering of system
voltage U

max

active after 1.5 s

Voltage vector surge

no tripping

Short time voltage drop

no tripping

Table 5.5: Dynamic behaviour of

MRF3

-Functions

* There is a free choice of parameters for the setting (see chapter 5.7.1).

Содержание MRF3

Страница 1: ...MRF3 Frequency Relay...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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