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TB MRI(K)3-C 03.02 E

19

Figure 4.7: Phase position between the residual voltage and zero sequence current for faulted and non-faulted lines in case of isolated

systems (sin

ϕ

)

U

E

- residual voltage

I

E

- zero sequence current

I

C

- capacitive component of zero sequence current

I

W

- resistive component of zero sequence current

By calculating the reactive current component (sin

ϕ

adjustment) and then comparing the phase angle in re-
lation to the residual voltage U

E

, the ER/XR-relay type

determines whether the line to be protected is earth-
faulted.
On non-earth-faulted lines, the capacitive component
Ic(a) of the total current precedes the residual voltage
by an angle of 90°. In case of a faulty line the capac-
ity current I

C(b)

lags behind the residual voltage at 90°.

Figure 4.8:

Phase position between the residual voltage and zero sequence current for faulted and non-faulted lines in case of

compensated systems (

cos

ϕ

)

U

E

-

residual voltage

I

E

-

zero sequence current

I

L

- inductive component of zero sequence current

(caused by Petersen coil)

I

C

-

capacitive component of zero sequence current

I

W

-

resistive component of zero sequence current

In compensated mains the earthfault direction cannot
be determined from the reactive current components
because the reactive part of the earth current depends
upon the compensation level of the mains. The ohmic
component of the total current (calculated by cos

ϕ

ad-

justment) is used in order to determine the direction.

The resistive component in the non-faulted line is in
phase with the residual voltage, while the resistive
component in the faulted line is opposite in phase with
the residual voltage.

By means of an efficient digital filter harmonics and
fault transients in the fault current are suppressed. Thus,
the uneven harmonics which, for instance, are caused
an electric arc fault, do not impair the protective func-
tion.

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Содержание MRI3-C

Страница 1: ...MRI K 3 C Digital time overcurrent relay with Control function and auto reclosing...

Страница 2: ...on 4 6 Earth fault directional feature ER XR relay type 4 7 Control functions 4 7 1 Introduction 4 7 2 Interlocking Password for control mode 4 7 3 Operating assignment of C B control 4 7 4 Changing t...

Страница 3: ...t of the digital inputs 5 11 5 Description of the digital input function 5 12 Measuring Value and Fault Indications 5 12 1 Measuring Value Indications 5 12 2 Units of the measuring values displayed 5...

Страница 4: ...e IMT trip characteristics of IEC 255 4 Normal inverse Type A Very inverse Type B Extremely inverse Type C Special purpose characteristics Reset mode for DMT IMT trip characteristics is se lectable De...

Страница 5: ...TB MRI K 3 C 03 02 E 5 3 Design 3 1 Connections Figure 3 1 Connection diagram MRIK3 ICE MRI3 ICE Figure 3 2 Connection diagram MRIK3 ICER MRI3 ICER...

Страница 6: ...s and earth current detection in Holmgreen connection IE This kind of connection can be used where three phase CTs are available and a combination of phase and earth current measuring is required Figu...

Страница 7: ...upervision relay Relay 1 C1 D1 E1 and C2 D2 E2 Relay 2 C3 D3 E3 and C4 D4 E4 Relay 3 C5 D5 E5 Relay 4 C6 D6 E6 Relay 5 Self supervision C7 D7 E7 All relays are operating according to the n o princi pl...

Страница 8: ...are activated according to the preset ting Code jumper 3 OFF All output relays will be reset automatically after the fault has been rectified e g when the fault current is interrupted Code jumper 3 O...

Страница 9: ...d CB ist switched on CB green CB is switched off CB blinking CB has faults 3 3 2 Adjusting LEDs I Overcurrent setting tI Tripping time for the overcurrent I Short circuit setting tI Tripping for the s...

Страница 10: ...ion of the earth current IP Indication of the active component of the earth fault current IQ Indication of the reactive component of the earth fault current Date and time CB red CB ist switched on CB...

Страница 11: ...e pickup value an alarm is given and after the set trip delay has elapsed the corresponding trip relay is ac tivated The relay setting values for all parameters are stored in a parameter memory EEPROM...

Страница 12: ...5 11 3 4 3 9 Activating of AR Prior to every AR it is possible to stipulate which kind of tripping I or I etc will lead to automatic re closing This can be separately fixed for each AR stage see chapt...

Страница 13: ...ital input is activated during this period the ON signal is set without delay 4 4 Functional sequence 4 4 1 Switching on MRIK3 C Is the C B to be supervised in OFF position while switching ON the MRIK...

Страница 14: ...ommand re mains either as long as the ON signal from the circuit breaker appears or the close impuls timer tCL has ex pired The LED tCL lights up for the duration of the close im pulse When the CB ON...

Страница 15: ...ith subsequent tripping of the protection relay The circuit breaker is switched off and the short circuit is cleared After expiration of the dead time tD1 unit MRIK3 C gives the reclosing command to t...

Страница 16: ...lines Short circuit Protection energized Protection tripped Circuit breaker Switch on command Manual on Protection tripped Figure 4 3 Manual closing of the C B to faulty lines Unit MRIK3 C is in inact...

Страница 17: ...the generator and the location of the current transformers supplying the relay Earth faults beyond the current transformers i e on the consumer or line side will not be detected Figure 4 5 Generator...

Страница 18: ...lt direction can be measured in three different ways depending on the voltage transformer connec tions refer to Table 4 2 Total current can be measured by connecting the unit either to a ring core C T...

Страница 19: ...nce current for faulted and non faulted lines in case of compensated systems cos UE residual voltage IE zero sequence current IL inductive component of zero sequence current caused by Petersen coil IC...

Страница 20: ...splay Display RMOT Switching on and off function via the front panel is blocked 4 7 4 Changing the operating assignment Changing the operating assignment requires the fol lowing procedure Simultaneous...

Страница 21: ...ated for a C B control function must be used see chapter 5 11 4 and 5 11 5 A detailed function assignment for the control signals for the C B can be found in Chapter 4 7 9 ON The C B is switched off T...

Страница 22: ...harts the detail handling is shown Control modus activation Display SEG Key Enter Key AND Mode Controlling Mode indication LCAL RMOT LCAL RMOT OR Change Mode Remote operation CB control only via seria...

Страница 23: ...ion LED CB flash green LED CB emits red Output relay CB OFF CB position OFF Supervision LED CB flash red LED CB emits green YES Display shows ON The CB LED emit green Display shows OFF The CB LED emit...

Страница 24: ...0 Flashed red CB 0 1 Flashed red CB 1 0 Emits green ON ON 1 1 Emits red OFF OFF CB position LED CB Display indication CB Ready CBOFF During switching 0 0 Flashed red CB 0 1 Flashed red CB 1 0 Emits r...

Страница 25: ...shed red 1 0 1 Emits green 1 1 0 Emits red 1 1 1 Flashed red CB position CB LED CB Ready CB ON 0 0 Emits green 0 1 Emits red 1 0 Emits green 1 1 Emits red CB position CB LED CB Ready CBOFF 0 0 Emits r...

Страница 26: ...d red 1 Emits green 0 x Emits green 1 x Flashed red CB position Before switch ON After switch OFF CB Ready LED CB CB ON CB OFF LED CB 0 Flashed red x 0 Flashed red x 1 Emits green 1 Emits green x 0 Fl...

Страница 27: ...s have to be designed as protection transformers P Overcurrent Factor To ensure precise operation of the protection unit even under full short circuit current the chosen transformers must not saturate...

Страница 28: ...tRST Chap 5 5 5 Reset mode for earth current 0s 60s I CHAR t I tRST Chap 5 5 15 Warning or Trip at earth fault measuring TRIP WARN IE Chap 5 5 11 Measured method of the residual voltage UE 1 E N 1 1 C...

Страница 29: ...ter SAV Manual trip TRI Blocking of the protection function BLOC NO_B PR_B TR_B LED of the blocked pro tection stage Chap 5 11 1 Relay assignment z B _ 2 _ _ LED of the blocked pro tection stage Chap...

Страница 30: ...ree digit point Example A 1500 5 A CT is used with a primary current of 1380 A The parameter for the CT primary current is given in kiloampere The parameter is set to 1 50 kA Then 1K38 is displayed as...

Страница 31: ...h preceding load To indicate that the max value of the switch off power is reached a alarm output can be set The indication take place be the means of a LED and or output relay The max possible value...

Страница 32: ...tting then the processor sets the tripping time or time factor to the highest sensible value smallest possible tripping time When adjusting to the Definite Time trip characteristic the definite trippi...

Страница 33: ...3 ICE and MRI K 3 ICXR re lates to IN 5 5 11 WARN TRIP changeover A detected earth fault can be parameterized as follows After delay time a warn only the alarm relay trips b trip the trip relay trips...

Страница 34: ...attempt follows only if the command time of the protection devices is shorter than the fault time set at MRIK3 5 6 3 Dead time tD Starts with the OFF signal of the circuit breaker No clos ing command...

Страница 35: ...Trip Via a digital input a external trip with settable time is set table The trip take place by the means of o high volt age level at the input for the setet time It is possibe to assign this in out f...

Страница 36: ...after the settable CB failure time Chap 5 7 4 and clear the block input of the upstream protection unit and acti vated the tripping I tI t1 0 tI t1 0 I tCBFP Protection Block Trip Block t1 0 Figure 5...

Страница 37: ...rtitioning of the store into 8 segments for instance This example shows that the store was used for more than 8 recordings because store spaces 6 7 and 8 are used From this it follows that no 6 was th...

Страница 38: ...is displayed 5 9 4 Pre Trigger time Tvor The time Tpre defines the period to be saved prior to the trip event This time can be set between 0 05 s and the max recording time 2 4 or 8 s With push butto...

Страница 39: ...ill store the set func tion By pressing the SELECT RESET pushbutton all further protective function that can be blocked are called one after the other After selection of the last blocking function ren...

Страница 40: ...3 4 2 3 and 4 1 2 3 4 all By pressing push buttons and all possible com binations can be realised The selected allocation can be saved by ENTER and subsequent entry of the password Any allocation mod...

Страница 41: ...ripping X 1 _ _ _ IE t red tIE red IE V Alarm X _ 2 _ _ IE green tIE V Tripping X 1 _ _ _ IE t green tIE green IE R Alarm X _ 2 _ _ IE red tIE R Tripping X 1 _ _ _ IE t red tIE red TCBFP Ausl sen _ _...

Страница 42: ...s will be assigned to the individual protection stages for pa rameter setting before the 1 st AR Actuation of the keys permits switching over between BLOC TIME or FAST Here the following functions are...

Страница 43: ...2 After the I TIME I tD2 2 nd AR IE TIME IE tD2 IE TIME IE tD2 Function Protec tion step Display indication corresponding LED Activation I NO SHOT I tD3 of the I YES SHOT I tD3 3 rd AR per IE NO SHOT...

Страница 44: ...ical function in a short from 1 RE This means that the DI No 1 is assign to the function reset The following func tions are available NO no function RE Reset Display and Relay BL Protection block trip...

Страница 45: ...e requirements for a manual switch ON operation When a high level at the assigned digi tal input take place the relay trips immediately When the digital input is reset to low level a counter starts an...

Страница 46: ...2 LED L2 green Current in phase 3 LED L3 green Earth current LED E green active earth current LED E and IP green reactive earth current LED E and IQ green residual voltage UR LED UE angle between IE...

Страница 47: ...rtion IQ 00m 99m 00 999 k00 k99 1k0 9k9 mA A kA kA rated current transformer 0 019kA rated current transformer 20kA Earth current normal Indication as Range Unit Secondary current Active portion IP Re...

Страница 48: ...erma nent light when the trip occured start to flash in or der to indicate that is was a past fault condition Those LEDs which were flashing when the trip oc cured element was actuated are flashing br...

Страница 49: ...voltage to C8 D8 Reset via interface By transmitting the RESET command from the Master PC An indication can only be reset if there is no protective function activated Otherwise TRIP remains in the di...

Страница 50: ...assword entry Ready for tests TRIP TRIP Start the test Release of self test relay Pick up of all output relays Test of all LEDs Select Reset SEG Finish the test Output relays return to their cur rent...

Страница 51: ...out directional feature For testing MRI K 3 C relays without directional feature only current input signals are required Figure 6 1 shows a simple example of a single phase test circuit with ad justab...

Страница 52: ...ccuracy of earth cur rent measuring 3 of measuring value 6 4 3 Checking the relay operating time For this test the AR function should be deactivated The number of automatic reclosing attempts SHOT sho...

Страница 53: ...lay under test For testing a relay with earth fault directional feature one of the input energizing quantity voltage shall be applied to the relay with a constant value within its ef fective range Th...

Страница 54: ...is impossible tCBFP must be set to EXIT 6 4 7 Checking the circuit breaker position First the digital inputs have to be assigned the relevant functions In order to recognised the circuit breaker posi...

Страница 55: ...reaker failure protection trips In this case the previously measured tripping delay has to be subtracted from the total tripping time measured 6 5 Primary Test As a rule tests with currents at the CT...

Страница 56: ...s at 60 Hz Storage capacity 16 s at 50 Hz bzw 13 33 s at 60 Hz Number of events 1 8 7 2 Common data Dropout to pickup ratio 97 Returning time 40 ms Time lag error class index E 20 ms Minimum operating...

Страница 57: ...n 1 70 V 1 1 1 120 V UN 230 V e n 2 160 V 1 1 2 300 V UN 400 V e n 5 300 V 1 1 5 500 V 1 V 1 V 2 V 2 V 5 V 5 V 5 of the setting value or 0 5 UN Operating cycle counter Setting range Step Tolerance No...

Страница 58: ...05 x IN 0 01 0 02 0 05 IN 0 01 0 02 0 05 0 1 0 2 0 5 1 0 2 0 5 0 10 20 s 0 01 0 02 0 05 0 1 0 2 5 of the setting value or 0 3 IN E 0 03 IN X 3 or 15 ms 3 of the measuring value of the current or 20ms...

Страница 59: ...blocked Permitted for AR YES NO YES Tripping of the choosen trip stage f hrt zur Wiedereinschaltung NO Tripping of the choosen trip stage block the reclosing tD1 0 1 20 s 0 01 0 02 0 05 0 1 0 2 0 5 1...

Страница 60: ...02 0 05 0 1 s 1 or 10 ms 7 3 7 Interface parameter Parameter LED Setting range Step Tolerance RS 1 32 Slave Adresse RS 2400 4800 9600 Baud Rate RS even odd no Parity even odd none 7 3 8 Parameter for...

Страница 61: ...120 t I RI inverse s t I I 236 0 339 0 1 t I S RXIDG characteristic s t I I n 3 1 8 5 t I S l Where t tripping time tI time multiplier I fault current Is Setting range of the current n l natural logar...

Страница 62: ...100 1000 t s tI 0 1 0 2 0 3 0 4 0 5 0 6 0 8 1 0 1 4 2 0 3 0 4 0 0 6 6 0 8 0 10 0 20 0 0 06 Figure 7 2 Very Invers Typ B 1 2 3 4 5 6 7 8 910 20 I IS 0 01 0 1 1 10 100 1000 10000 t s tI 0 1 0 2 0 3 0 4...

Страница 63: ...4 5 6 7 8 910 20 I IS 0 1 1 10 100 t s tI 8 0 6 0 3 0 4 0 2 0 1 6 1 0 1 4 1 2 10 0 0 8 0 6 0 5 0 4 0 3 0 2 0 1 0 05 Figure 7 6 RXIDG characteristic 1 10 I IN 0 01 0 1 1 10 100 t s I tI I tI 4 0 260 0...

Страница 64: ...sh mounting A D Communication protocol Modbus RTU Please leave box empty if option is not desired Time overcurrent earth fault current re lay with control function MRI3 C M 3 phase current I I Rated c...

Страница 65: ...ting of the seconds second s 00 System parameter LED Function Unit Default Actual settings settings L1 L2 L3 green Iprim r Phase Display of measuring values as primary quantities xIn kA E green Iprim...

Страница 66: ...nt xIn 0 01 0 1 IE Warning Tripping of the earth current stage trip IE t green tIE green Tripping time in forward direction s 0 04 IE t red tIE red Tripping time in reverse direction s 0 04 IE t IE Fa...

Страница 67: ...IE stage is the tripping cause NO NO Tripping after 2nd AR I tD2 For overcurrent stage TIME TIME I tD2 For short circuit stage TIME TIME IE tD2 For earth overcurrent stage TIME TIME IE tD2 For earth s...

Страница 68: ...ding at the event TRIP FR Time period prior to the trigger impulse s 0 05 Interface parameters LED Function Default setting Actual set ting RS Slave Address of the serail interface 1 RS Baud rate of t...

Страница 69: ...I Alarm X I t tI I trip X I I Alarm X I t tI I trip X I I IE IE CB green I I IE IE Fast Fast trip step X IE IE Alarm X IE t tIE IE trip X IE IE Alarm X IE t tIE IE trip X CB green t CB failure protec...

Страница 70: ...tual settings plugged Not plugged X X X only MRI3 relay types Digital inputs Code jumper Function Low High range for the digital inputs Terminal Low plugged High not plugged Default settings Actual se...

Страница 71: ...01 Setting of the hours hour h 00 Setting of the minutes minute m 00 Setting of the seconds second s 00 System parameter LED Function Unit Default Actual settings settings L1 L2 L3 green Iprim r Phase...

Страница 72: ...Tripping of the earth current stage Trip IE CHAR Trip characteristics for the phase overcurrent element DEFT IE t tIE Tripping time factor for the earth overcurrent element s 0 03 IE t IE Fast Fast t...

Страница 73: ...E stage is the tripping cause NO NO Tripping after 2nd AR I tD2 For overcurrent stage TIME TIME I tD2 For short circuit stage TIME TIME IE tD2 For earth overcurrent stage TIME TIME IE tD2 For earth sh...

Страница 74: ...t the event TRIP FR Time period prior to the trigger impulse s 0 05 Interface parameters LED Function Default setting Actual set ting RS Slave Address of the serail interface 1 RS Baud rate of the ser...

Страница 75: ...I I tripping X I I alarm X I t tI I tripping X I I IE IE CB gr n I I IE IE Fast Fast trip stage X IE IE alarm X IE t tIE IE tripping X IE IE alarm X IE t tIE IE tripping X CB gr n t CB failure protect...

Страница 76: ...Actual settings plugged Not plugged X X X only MRI3 relay types Digital inputs Code jumper Function Low High range for the digital inputs Terminal Low plugged High not plugged Default settings Actual...

Страница 77: ...TB MRI K 3 C 03 02 E 77...

Страница 78: ...ermany Phone 49 0 21 52 145 1 Internet Homepage http www newage avkseg com Documentation http doc newage avkseg com Sales Department Phone 49 0 21 52 145 635 Europe Phone 49 0 21 52 145 319 Latin Amer...

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