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MRI1IU

PROTECTION TECHNOLOGY
MADE SIMPLE

VOLTAGE CONTROLLED TIME-OVERCURRENT RELAY

HighTECH Line

VOLTAGE CONTROLLED TIME-OVERCURRENT RELAY

Revision: A

Original document

English

MANUAL

Содержание HighTECH Line MRI1IU

Страница 1: ...MRI1IU PROTECTION TECHNOLOGY MADE SIMPLE VOLTAGE CONTROLLED TIME OVERCURRENT RELAY HighTECH Line VOLTAGE CONTROLLED TIME OVERCURRENT RELAY Revision A Original document English MANUAL ...

Страница 2: ...0 Blocking the protection functions and assignment of the output relays 5 3 Indication of measuring values and fault data 5 3 1 Indication of measuring values 5 3 2 Indication of fault data 5 4 Reset 6 Relay testing and commissioning 6 1 Power On 6 2 Testing the output relays and LEDs 6 3 Checking the set values 6 4 Secondary injection test 6 4 1 Test equipment 6 4 2 Example of test circuit 6 4 3 ...

Страница 3: ... high frequence harmonics and DC components induced by faults or system operations Selectable protective functions between definite time overcurrent relay and inverse time overcurrent relay Selectable inverse time characteristics according to BS 142 and IEC 255 4 Normal Inverse Very Inverse Extremely Inverse Reset setting for inverse time characteristics select able High set overcurrent unit with ...

Страница 4: ...o output relays with two change over contacts and two with one change over contacts can be assigned as required All relays are working current relays only the relay for self supervision is an idle current relay To prevent that the C B trip coil circuit is interrupted by the MRI1 IU first i e before interruption by the C B auxiliary con tact a dwell time is fixed This setting ensures that the MRI1 ...

Страница 5: ...otected object are converted to voltage signals in proportion to the currents via the input trans formers and burden The noise signals caused by in ductive and capacitive coupling are suppressed by an analogue R C filter circuit The analogue voltage signals are fed to the A D converter of the microprocessor and transformed to digital signals through Sample and Hold circuits The analogue signals ar...

Страница 6: ... a time overcurrent relay basic unit MRI1 and an additional undervoltage supervision unit The undervoltage supervision unit has an influence on the tripping delay of the overcurrent and short circuit steps by switching two setting points In normal opera tion at nominal voltage the MRI1 IU operates like a normal time overcurrent relay with preselected tripping characteristic IDMT DMT and adjusted p...

Страница 7: ...ve parameter SAV ENTER Save parameter SAV ENTER for about 3 s Software version First part e g D01 Sec part e g 8 00 TRIP one time for each part Manual trip TRI TRIP three times Inquire password PSW TRIP ENTER Relay tripped TRIP TRIP or after fault tripping Secret password input XXXX SELECT RESET ENTER System reset SEG SELECT RESET for about 3 s Table 5 1 possible indication messages on the display...

Страница 8: ...nyone of these four characteristics can be chosen by using push buttons and can be stored by us ing ENTER push button 5 2 3 Trip delay or time multiplier for phase overcurrent element tI Usually after the characteristic is changed the time delay or the time multiplier should be changed accord ingly In order to avoid an unsuitable arrangement of relay modes due to carelessness of the operator the f...

Страница 9: ...D U however flashes red When the current setting for high set element is set out of range on display appears EXIT the high set ele ment of the overcurrent relay is blocked The high set element can be blocked via terminals E8 D8 if the corresponding blocking parameter is set to bloc 5 2 6 Trip delay for high set element tI Independent from the chosen tripping characteristic for I the high set eleme...

Страница 10: ... are assigned as alarm relays and red as trip ping relays Definition Alarm relays are activated at pickup Tripping relays are only activated after elapse of the tripping delay After the assignment mode has been activated first LED I lights up green Now one or several of the four output relays can be assigned to current element I as alarm relays At the same time the selected alarm re lays for frequ...

Страница 11: ...time when a certain relay function is energised by a fault the corresponding function LED lights up yel low At the same time the phase LED s is are flash ing red to indicate the faulty phase s After the time delay is expired the relay tripps the LED s for faulty phase s indication turn s to a steady red light 5 4 Reset Unit MRI1 IU has the following three possibilities to re set the display of the...

Страница 12: ... pressing the push button TRIP twice the display shows the second part of the soft ware version of the relay e g 4 01 The software version should be quoted in all correspondence Press ing the TRIP button once more the display shows PSW Please enter the correct password to proceed with the test The message TRI will follow Confirm this message by pressing the push button TRIP again All output relays...

Страница 13: ...cuits terminals A3 A5 A7 and inject a current which is less than the relay pickup current set values in phase 1 terminals B3 B4 and check the measured current on the display by pressing the push button SELECT RESET For a re lay with rated current In 5A for example a secon dary current injection of 1A should be indicated on the display with about 0 2 0 2 x In The voltage will be indicated on the di...

Страница 14: ...of inverse time characteristics the injected cur rent should be selected according to the characteristic curve e g two times IS The tripping time may be red from the characteristic curve diagram or calculated with the equations given under technical data Please observe that during the secondary injection test the test current must be very stable not deviating more than 1 Otherwise the test results...

Страница 15: ... 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 protective relays employed the importance of the primary equipment being protected the user s past experience with the re lay etc For electromechanical or static relays maintenance testing will be performed at ...

Страница 16: ...A at IN 5 A 0 1 VA Power consumption in voltage circuit 1 VA Thermal withstand capability in current circuit dynamic current withstand half wave 250 x IN for 1 s 100 x IN for 10 s 30 x IN continuously 4 x IN Thermal withstand in voltage circuit continuously 1 5 x UN 7 2 Common data Dropout to pickup ratio 97 Returning time 30 ms Time lag error class index E 10 ms Minimum operating time 30 ms Trans...

Страница 17: ... V 5 from set value 7 3 2 Inverse time overcurrent protection relay According to IEC 255 4 or BS 142 Normal Inverse t I Is t I s 014 0 02 1 Very Inverse t I Is t I s 135 1 Extremely Inverse t I Is t I s 80 2 1 Where t tripping time tI time multiplier I fault current Is Starting current Setting range Step Tolerance ISN ISL tI 0 2 4 0 x IN 0 05 10 0 05 0 1 x IN 0 01 0 02 3 from set value or min 1 In...

Страница 18: ... 0 5 0 6 0 8 1 0 1 4 Figure 7 2 Extremely Inverse 1 2 3 4 5 6 7 8 910 20 I IS 0 1 1 10 100 1000 t s tI 10 0 8 0 6 0 4 0 3 0 2 0 0 05 0 1 0 2 0 3 0 4 0 5 0 6 0 8 1 0 1 4 Figure 7 3 Very Inverse 1 10 I IN 0 01 0 1 1 10 100 t s tI I tI 260 0 03 1 0 40 2 0 0 03 I 0 02 4 0 Figure 7 4 Definite time overcurrent relay 7 5 Output contacts Number of relays dependent on relay type Contacts 2 change over cont...

Страница 19: ... Default setting Actual setting Default setting Actual setting Default setting Actual setting Plugged no function Not plugged X X Assignment of the output relays Function Relay 1 Relay 2 Relay 3 Relay 4 Default setting Actual setting Default setting Actual setting Default setting Actual setting Default setting Actual setting I alarm X I tripping X I alarm X I tripping X Assignment of the blocking ...

Страница 20: ...ow voltage x In 0 2 CHAR I Tripping characteristics DEFT tI Time delay at independent time s 0 03 tI Time multiflier at dependent time characteristics tI Reset Reset Modus for dependent time characteristics I SNormal High set current at nominal voltage x In 1 0 I SLow High set current at low voltage x In 1 0 tI Time delay s 0 03 U Threshold value for undervoltage setting V 10V 20V 40V Rated freque...

Страница 21: ...TD_MRI1 IU_05 04_GB 21 ...

Страница 22: ... 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 52 145 614 Fax 49 0 21 52 145 354 E mail info SEGelectronics de SEG Electronics has company owned plants subsidiaries and branches as well as authorized distributors and other authorized service and sales f...

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