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TB MRD1-T 10.01 E

9

General idealized view

Differential protection is a strict selective object protec-
tion and is based on the current measuring principle at
the input and output side of the object being pro-
tected. Dependent on the earthing method used, the
neutral can also be included in measuring and bal-
ance.
The area between input and output CTs of the object
is classed as protection zone supervised by the

MRD1

. Included in the protection zone are also CTs

and CT connection wire to the relay.

protected area

transformer

MRD

I

1

I

2

GRID

GRID

Fig. 1:

Definition of protection zone

The relay checks constantly if the incoming currents of
the input side are met by respective outgoing currents
at the output side. If the balance of the conductor cur-
rents shows a difference, this may suggest a fault
within the protection zone. Especially where trans-
formers are concerned it is necessary that all conductor
currents are converted to one reference transformer
side according to their transformation voltage ratio
and to their vector group so that quantities and phases
can be compared.

To distinguish between faults occuring within (inter-
nally) or outside (externally) of the protection zone is
the main purpose of the differential protection because
at internal faults the differential protection relay must
trip, but not so at external faults.

Examples:

External fault

During a short circuit occuring at the right grid, the
complete short circuit current flows through the trans-
former. The difference between incoming and outgo-
ing currents of all transformer terminals is small (in ideal
cases = zero) I

1

-I

2

= 0. The differential protection relay

does not trip. (Switching off in such cases probably to
be realized by an overcurrent relay).

protected area

transformer

MRD

I

1

I

2

short circuit current

GRID

GRID

Fig. 2:

External fault

Internal fault

When an internal fault occurs the current balance is
different. Dependent on the kind of fault a deficit in the
total of incoming currents can be observed. A winding
short circuit, for instance, can be fed from both sides,
even if with different intensity. But this short circuit does
not go through the transformer, it is fed from both grids
into the transformer. So therefore the current balance
shows a difference.

protected area

transformer

MRD

I

1

I

2

short circuit current

GRID

GRID

Fig. 3:

Internal fault (example of a short circuit fed from
two sides)

Due to the chosen direction of the reference arrow,
current I

2

flows here in negative direction.

The differential relays detects a current difference of I

1

-

I

2

= Id and trips when Id has exceeded the set thresh-

old.

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Содержание MRD1-T

Страница 1: ...MRD1 T Transformer Differential Protection System ...

Страница 2: ...n 5 1 General 5 1 1 Data organization 5 1 2 Parameter sets 5 1 3 Key function 5 1 4 LEDs 5 1 5 VIEW mode EDIT mode 5 1 6 OFFLINE TEST mode 5 1 7 Reset DEVICE RESET 5 1 8 Enter password 5 1 9 Password forgotten 5 2 SYSTEM settings 5 2 1 Selection 5 2 2 Overview 5 2 3 Time Date 5 2 4 Password change 5 3 PARAMETER pages 5 3 1 Selection 5 3 2 Overview 5 3 3 Transformer ratings 5 3 4 Protection paramet...

Страница 3: ...atical algorithm for measured value processing possible for the MRD1 as well as utilization of the trip decision resulting from the individual protection functions The MRD1 software is also of modular structure Each protection function is al located to a special program segment and so it is possible to subsequently add further functions All essential parameters measuring data or values calculated ...

Страница 4: ...es Wide ranging automatic self tests Small relay size Indication of relay functions optically or via sepa rate self supervision relay Three possibilities for relay resetting All data interfaces galvanical isolated Rated frequency selectable 50 Hz 60 Hz Parameter setting protected by password Functions which can be programmed by the user Protection and system parameters Latched position or minimal ...

Страница 5: ...em indications are arranged underneath the alphanumerical display They are allocated to a certain function and show Operational voltage available Trip OFFLINE TEST mode active Edit mode active Displayed parameter is modified but has not been stored yet Switch status of the 5 optionally 10 output relays Display of the relay function self test b Status display of the 15 digital inputs if provided Th...

Страница 6: ... temperature measuring module graphic display module For the CAN Bus interfaces two 9 pole D SUB plug and socket connectors are used 3 2 3 Function inputs and signal inputs optionally These 15 digital inputs contacts 1 15 are combined on the 16 pole plug and socket connector The six teenth contact is the common return wire Any incom ing information a can direct be assigned to selectable output rel...

Страница 7: ...ring or protection devices the MRD1 can be looped in to existing CT lines assumed the CT being able to carry the total burden Apart from further connections for voltage supply of the relay the module is also provided with a digital input for remote resetting as well as connection facilities for the five output relays Four of these are free to be used acc to requirement the fifth is assigned for Se...

Страница 8: ...ed which stabilize the differential relay against nuisance tripping Stabilizing always means the pickup current is raised and by this the differential relay becomes more intensitive but is never completely blocked IS Stabilizing current This current develops from the bias current and represents the extent of stabilizing measures necessary as result of the fundamental analysis Parameters of the sta...

Страница 9: ... main purpose of the differential protection because at internal faults the differential protection relay must trip but not so at external faults Examples External fault During a short circuit occuring at the right grid the complete short circuit current flows through the trans former The difference between incoming and outgo ing currents of all transformer terminals is small in ideal cases zero I...

Страница 10: ...ach of these static factors can cause unin tended trippings With increasing bias current the pickup current has to be corrected upwardly The following pickup characteristic exact characteris tic gives an detailed study of the individual fault fac tors and the resulting fault current In fig 4 the ex pected fault current versus tripping characteristic is shown If a real fault occurs the measured dif...

Страница 11: ...urrent Id which does however not exist at the primary side and this may cause unin tended tripping In fig 5 core saturation due to short circuit current is il lustrated Short circuit currents often contain a DC component The high primary current arising during this kind of fault generates a magnetic B induction causing saturation of the iron core The iron core keeps this high induction until the p...

Страница 12: ...on The additionally adjustable parameter Idiff high set Idiff is a high current differential element This set ting value is not subjected to stabilization and specifies the highest permissible differential current This pa rameter defines characteristic sector III Tripping procedure The protection program permanently checks the meas urements that the DSP digital signal processor deliv ers When the ...

Страница 13: ...d monitoring data entry from the different measuring channels In addition all input signals are digitally Fourier filtered Among other values this proc essor calculates RMS values and analyzes harmonics by processing sampled data and stores digitalized signal sequences to the memory Apart from data management and processing the DSP keeps perform ing wide ranging self tests 4 4 Digital main process...

Страница 14: ...fault memory program memory 3 3 3 analogue measurements PCM memory card serial PC interface RS232 signal processor main processor central module extension module base module main processor bus optional communi cation parameter memory blocking input supply 5 output relays SOFTWARE Relay matrix RESET input dual ported memory 5 output relays ...

Страница 15: ...u tively in the recorder Additionally to the measured data the following details are also stored the cause for tripping serial number of the incident as well as date and time at the instant of tripping The MRD1 is able to record several incidents in a FIFO memory The longest stored data is overwritten when a new incident occurs Complete data of alto gether 10 incidents can always be called off Mor...

Страница 16: ... quested Protection function Software version number Number of version and date of software are in quired no remains active LED Test all LEDs light up red f 2s all LEDs light up green f 2s no remains active Test of output relays Sequence in one second interval self test relay de energizes all other relays de energize all relays energize one after the other with LED relays return to actual position...

Страница 17: ...portant for relay tests test of the reset time where the test current is not switched off imme diately with tripping TRIP condition Auslösebedingung Relay energized Relais angezogen RESET TIME Mindestkommandozeit t RESET TIME Mindestkommandozeit 1 0 1 0 Fig Reset time If a relay is to remain self holding after tripping the reset time has to be set to exit Setting as per cus tomer s requirements ca...

Страница 18: ...ons are blocked also in case the exter nal blocking may was released In case of longer con tinuous external blocking the blocking can be stopped after a maximum hold time tmax for enabling the relay to trip in case of ongoing faults wirksame Blockierzeit effective block time ext Block Eingang ext blockage input tmin t tmax Note Repeated impulse at the blocking time within tmin restart the hold tim...

Страница 19: ...T Recorder PARAMETER measurements data recorder PARAMETER page 3 parameter 3 1 parameter 3 2 parameter 3 3 PARAMETER page 2 parameter 2 1 parameter 2 2 parameter 2 3 PARAMETER page 1 parameter 1 1 parameter 1 2 parameter 1 3 TEST routines TEST routines software version relays test LED test memory test 4 parameter sets SYSTEM parameter SYSTEM PARAMETER clock setting serial port options work set sel...

Страница 20: ...memory display keyboard serial interface parameter set 1 parameter set 2 parameter set 3 parameter set 4 protection program output relay message display LED measurement switch open in Offline Test Mode SYSTEM parameter transformer Fig 5 1 2 Parameter sets principle For processing the selected set is loaded into the EDIT memory switch Set to Edit After parameters have been changed the EDIT memory i...

Страница 21: ...election YES b toggle setting in EDIT mode yes no on off finish working in EDIT mode perform parameter plausi bility check and save if check passed all modifications a reject selection NO b cancel modification c clear message a From HOME POSITION DEVICE RESET b From Sub Menu back to home position no operation password protected press and hold down PARA press UP in addition to PARA release both Not...

Страница 22: ... supply off Device OFF TRIP off Normal red Trip red flashing a Energized TEST off Normal red flashing a OFFLINE TEST mode active EDIT off Normal VIEW mode red EDIT mode after password access MODIFIED off Normal red EDIT mode parameter modified Relay off Relays off red green Relays energized Relay test red flashing b Relay off after energizing until DEVICE RESET red flashing a Relay blocked SELFTES...

Страница 23: ...pted Checkback ARE YOU SURE Before the parameter set ist finally stored an internal plausibility check is performed to ensure that all settings are conclusive If the check routine detects a irresolute combination of settings the user will be informed and the settings are not stored e g an unsuitable combination of trans former rated current which is calculated from rated voltage and power capacity...

Страница 24: ... is activated with selftest relay unenergized During OFFLINE TEST mode the transformer is not protected by the MRD1 Although a failure could be detected during this mode the MRD1 would not ini tiate a trip of the transformer In order to prevent dangerous conditions the trans former must either have a sufficient backup protection or has to be switched off After an intended OFFLINE TEST this mode mu...

Страница 25: ...IT on password incorrect LED EDIT remains off Table Procedure for entering a password Message appears for app 2 s Note Any process started can be stopped at any time by pressing key RESET The password entered at our works consists of key sequence It is adviseable to change this password immediately to an individual one LED EDIT indicates if the password entered is cor rect In this state changes on...

Страница 26: ...26 TB MRD1 T 10 01 E ...

Страница 27: ...ld press PARA in addition to release both SYSTEM parameter page line 1 line 2 line 3 line 4 select line change value password access line 2 ___________ line 2 acual setting to change a value or start an operation ENTER to confirm or save ENTER Fig System settings principle Note To change any setting or start an operation Select parameter or option with UP DOWN Press ENTER Enter password if request...

Страница 28: ...ng via master programming via interface enable disable disable parameter set switch over via interface enable disable disable activate Offline TEST Mode enable disable enable select active parameter set 1 4 1 change password see 5 2 4 clear all parameter sets and set to default The device switches to OFFLINE TEST mode automatically clear event recorder clear fault recorder Table SYSTEM settings pa...

Страница 29: ...e the same function for this set ting procedure Both move the cursor always to the next digit group After reaching the SECOND col umn it is switched back to YEAR again Digits for the year and month have to be entered before digit s for the day to enable the MRD1 to carry out correct cal culation of intercalary days as well as the max days in a month The internal clock does not stop during the sett...

Страница 30: ...d has to be entered twice If the entries are not identical the password is not changed and the previous one still applies Please see table be low Display Step Key Password change with ENTER Request to enter old password enter new password enter new password again changing done The new password wouldn t be typed 2 times identically Try again message appears for app 2 s Table Password change procedu...

Страница 31: ...ded and is now ready for editing continued at 5 3 2 PARA pages page 1 page 2 page 3 page 4 page 2 param 2 1 param 2 2 param 2 3 param 2 4 PARAMETER 2 3 value leaf to next page select line change value password access Fig Parameter pages organization Possibilities after modifying a parameter Keep modifications and scroll to next line up down Keep modifications and leaf to next page PARA short Cance...

Страница 32: ...ence current at Is 0 In Difference current at Is 2 In Difference current at Is 10 In max Difference current Idiff d Id Offset in case of harmonics 5 3 4 Parameter of lo gic functions Assignment of protective and logic functions AND logic Parameter of output relays Reset time or self holding of the output relay 5 3 5 Parameter of ex ternal blocking Table Parameter pages overview On the first attemp...

Страница 33: ... 17 3 MVA corresponding to winding 2 10 kVA 800 MVA 17 3 MVA corresponding to winding 3 10 kVA 800 MVA 17 3 MVA rated voltage of winding 1 phase to phase voltage on high voltage side 100 V 800 kV 20 kVA corresponding to winding 2 100 V 800 kV 6 6 kV corresponding to winding 3 100 V 800 kV 6 6 kV rated primary current of phase CT winding 1 1 50 000 A 500 A corresponding to winding 2 1 50 000 A 1500...

Страница 34: ...igzag wye n zigzag n wye n phase shift in winding 3 in 30 in relation to winding 1 0 11 0 voltage displacement by transformer tap changer in winding 1 20 20 0 0 Winding 1 CT connection in nor mal polarity like connection dia gram or inverted reverse polarity normal inverted normal corresponding to winding 2 normal inverted normal corresponding to winding 3 normal inverted normal NOTE The Parameter...

Страница 35: ...0 Additional error by saturation of the CTs Idiff maximum permitted difference current d Id raise up of characteristic curve by offset in case of characteristic harmonics In Transformer nominal current 0 Stabilisierungsstrom stabilizing current Is In Differenzstrom differential current Id In 5 Idiff Is In 10 10 Idiff 1 2 8 Einstellbereich der Kennlinie setting range of characteristic 2 8 I II III ...

Страница 36: ...rresponding to Is In 2 0 2 1 In 1 0 corresponding to Is In 10 2 0 8 0 In 8 0 maximum permitted differential current 2 0 20 0 In 20 0 Offset of characteristic curve from static basic characteristic curve 0 0 8 0 2 0 Table Adjustable protection parameter To get no negative slope in the characteristic part I the setting Idiff Is 2 must not be less then the setting Idiff Is 0 The MRD1 will check the i...

Страница 37: ...ne Assignment of relay 1 to logic functions A P OR logic ABC P AB corresponding to relay 2 ABC P AB corresponding to relay 3 ABC P AB corresponding to relay 4 ABC P AB corresponding to relay 6 ABC P AB corresponding to relay 7 ABC P AB corresponding to relay 8 ABC P AB corresponding to relay 9 ABC P AB optio nal corresponding to relay 10 ABC P AB ...

Страница 38: ... relay 6 If equipped 0 00 1 00s exit 0 2 s corresponding to relay 7 If equipped 0 00 1 00s exit 0 2 s corresponding to relay 8 If equipped 0 00 1 00s exit 0 2 s corresponding to relay 9 If equipped 0 00 1 00s exit 0 2 s corresponding to relay 10 If equipped 0 00 1 00s exit 0 2 s Table Reset time of the output relays The reset time ist the minimum time the relay keeps energized after a trip If the ...

Страница 39: ...ve function A Id Assignment of logic functions B to protective functi ons here protective function B Id Assignment of logic functions C to protective func tions here protective function A and B Assignment of logic functions P to protective func tions here no protective function Nota Nota Nota Nota For MRD1 there is the following definition Ptotective function A Differential protection Id Low Set P...

Страница 40: ...40 TB MRD1 T 10 01 E Scheme ...

Страница 41: ...einstel lung Select Set 1 Set 2 Set 3 Set 4 Header Line Blocking of protective functions here protective function A and B AB AB Min hold time of blocking exit no min hold time 0 0 60 0 exit 0 1s Max bloccking time when continuouing blocking si gnal exit latched as long as signal holds 0 1 60 0 exit 2 0s ...

Страница 42: ...arameter In this case the EDIT mode is not left and the value can be corrected When setting parameters via an interface validity errors are indicated by a spezial telegramm mes sage A setting is not regarded to be valid if one of the following conditions are not met CT mismatch for each winding 1 8 IN IWPN 2 IN CT transformation ratio at MRD1 rated current IWPN 5 A Relation of voltage levels For t...

Страница 43: ... on the data pages Key Display DATA page page 1 Fault Rec Event Rec page 1 meas 1 1 meas 1 2 meas 1 3 measurement 1 3 value leaf to next page select line Data recorder last but one time FAULT EVENT I DIFF TRIP select a stored value date event value 1 value 2 DATA recorder 1 2 3 4 Fig Data pages organization ...

Страница 44: ...ent L1 L2 L3 Differential current Stabilizing current Is fundamental oszillation analysis Stabilizing factor m harmonic analysis Recall stored trip datas Trip message date time measurements calculated measurements Recall event messages Message text date time Recall statistic Data Operating hours Trip counter Alarm counter Table Data pages overview ...

Страница 45: ... of the phase current L1 of winding 1 in A corresponding to L2 corresponding to L3 etc Phase current in A all phases all windings calculated difference current Idiff calculated stabilizing current Irestr calculated stab factor harm restr Table Operational measured data related to the transformer nominal current ...

Страница 46: ...tored data for all existing registers Record n in chronological or der Trip number date time trip reason all stored data The display shows at the end of the list or if no trips are stored Table Fault Recorder Key Display Value next value Headline of the last trip e g Trip number Reason of the trip Date of trip Time of trip Current L1 of winding 1 in A etc corresponding for all stored datas Table D...

Страница 47: ...1 event message date time of the last trip but one previous corresponding to all stored events Event n event message date time in chronological order The display shows at the end of the list Table Event Recorder Key Display Value next value Event number and event mes sage e g last event Date of event Time of event Table Message and time date ...

Страница 48: ... MRD1 T 10 01 E 5 4 6 Statistic data Key Display Value next value Headline MRD1 Operating hours Trip counter Alarm counter Table Statistic data Note Note Note Note This statistic counters can not be resetted ...

Страница 49: ...TB MRD1 T 10 01 E 49 5 5 TEST routines page Self test 5 5 1 Page selection Page select Display TEST routines test 1 test 2 test 3 test 2 select test password access start test test is running ...

Страница 50: ...rd needed Test Test of the output relays IMPORTANT all relays will be energised in a 1 s interval The Selftest Relay keeps off for the duration of the test After the test all relays will be set to the state before Test Memory program test This routine will test the memory and the program by calculating a checksum NOTE Password is needed because the protection function is disabled during the test T...

Страница 51: ...e set No to edit 3 confirm selection set will be loaded in EDIT memory 4 leaf to first parameter page 5 scroll to the first line of this page first parameter 6 if necessary change displayed value on first modification enter password For bit wise parameter like system parameter Group Ad dress press shortly 7 scroll to next line second parameter there is no need to confirm the modification of step 6...

Страница 52: ...and reset to old value if LED MODIFIED illuminated short edit another parameter set finish with ENTER long or RESET long and continue on step 1 Note Note Note Note There is no need to confirm any modification by pressing ENTER All modifications are temporarily stored in the edit memory when scrolling with up down keys When pressing ENTER long all modifications in the edit memory will be stored in ...

Страница 53: ...6 B7 B8 I MRD1 A3 A4 A5 A6 A7 A8 W1 W2 W1 W2 B3 B4 B5 B6 B7 B8 A3 A4 A5 A6 A7 A8 A A A B MRD1 W1 W2 I B3 B4 B5 B6 B7 B8 A3 A4 A5 A6 A7 A8 I IL1 L2 L3 L1 L2 L3 LFG1 A A A D Symmetrisches Dreiphasensystem symmetrical three phase system MRD1 W1 W2 I B3 B4 B5 B6 B7 B8 A3 A4 A5 A6 A7 A8 I IL1 L2 L3 L1 L2 L3 LFG1 A A A C Symmetrisches Dreiphasensystem symmetrical three phase system NOTE for relay tests ...

Страница 54: ...ection in the switchboard Entry of rated system data Has all rated system data correctly been programmed Are the indices of the vector group setted Are the CTs connected normal or revers Setting of parame ters for protection Have all parameters for protection correctly been programmed Reset time Are the reset times set to all output relays Selection of work parameter set Has the right parameter se...

Страница 55: ...om the table All figures are to be understood as ap proximate values and are a multiple of the load current Case Differential current Idiff In Through current Is In 1 All CTs are correctly connected 0 1 2 One CT connect with rev polarity 1 33 0 66 3 Two CTs connect with rev polarity 2 0 0 4 Three CTs connect with rev polarity 2 0 0 Table Recommended values for differential current and stabilizing ...

Страница 56: ...oltage auxiliary voltage supply Input CT a Phase current CT Rated current IN 1 A or 5 A Power consumption in current path at IN 0 1 VA Thermal withstand capability in current circuit 250 IN VDE 435 T303 dynamical current withstand half wave 100 IN for 1 s 30 IN for 10 s 4 IN continuously VDE 435 T303 linear range Low Range 0 05 2 IN High Range 2 64 IN Range setting automatical Resolution 12 Bit pe...

Страница 57: ... 3 RS485 Data transmission rate 9600 Baud Connection plugged terminals RXT TXD P RXT TXD N Signal Ground PE Insulation voltages DIN 19244 part 3 IEC 870 3 Output relay Contact class IIB DIN VDE 435 part 120 max breaking voltage 250 VAC 300 VDC max closing power 1500 VA 250 V max breaking power 11 VA 220 VDC at L R 40 ms max rating making current 6 A Short circuit current 20A 16 ms Rated inrush cur...

Страница 58: ...ischarge ESD test as per VDE 0843 part 2 IEC 77B CO 21 IEC 255 22 2 8 kV Electrical fast transient Burst test as per DIN VDE 0843 part 4 IEC 77B CO 22 IEC 255 22 4 4 kV 2 5 kHz 15 ms Radio interference suppression test as per EN 55011 limit value class B Radiated electromagnetic field test as per ENV 50140 electric field strength 10 V m Power frequency magnetic field immunity test 100 A m continuo...

Страница 59: ...tivated by external input End of blocking Difference current trip Difference current trip released Difference current high set trip Difference current high set trip released Change output relay state except Selftest relay Selftest relay is energized Selftest supervision relay is de energized Lamp test is finished Test of the output is finished Self test is finished Offline Test Mode is active Offl...

Страница 60: ...ut auxiliary voltage and earth connection measuring inputs B column W3 low voltage side output Relays measuring inputs A column W2 low medium voltage side B column W1 high voltage side output Relays 2 3 4 5 6 7 8 9 C D E A B 1 2 3 4 5 6 7 8 F 1 2 3 4 5 6 7 8 9 C D E A B 1 2 3 4 5 6 7 8 F 1 CAN1 CAN2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 SEG MRD1 RWI D RS485 GND PE PE P N GND P N ...

Страница 61: ...ormer The System W1 is assigned to the high voltage side Important Note For perfect functioning of the rush stabilization system it is essential that the MRD T is connected in the cor rect phase sequence i e that there is a positive rotating field Refer also to page 11 ...

Страница 62: ...ystems W2 and W3 are differ ent the system W3 must be assigned to the lower voltage level Technical data subject to change without notice Important Note For perfect functioning of the rush stabiliza tion system it is essential that the MRD T is connected in the correct phase sequence i e that there is a positive rotating field Refer also to page 11 ...

Страница 63: ...liary voltage 24 V 19 to 40 V DC 48V 60V 38 to 72 V DC 110V 125V 220V 88 to 264 V DC L M H Housing 42TE additional MRD1 T2 HTL 3F42 for T2 G resp MRD1 T3 HTL 3F42 for T3 available necessary rack for the single components Note Note Note Note Normally the MRD1 is provided with one type of current transformer only 1A or 5A Equipment with two CTs of different current ratings in one relay only on reque...

Страница 64: ...64 TB MRD1 T 10 01 E ...

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