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Manual MRG3

SEG Electronics GmbH

DOK-TD-MRG3, Rev. D

Protection parameters: Mains decoupling

Relay type

Default
settings

Actual
settings

Symbol LED

Function

Unit

-I

-U0

-IE

-IU0

-IER

Set 1
Set 2

Set1
Set 2

U+1+<

Pickup value for the
1

under voltage element

(low set)

X X X X X X 90

U+1+<+t>

Tripping delay for the
1

under voltage element

X X X X X X 0.04

U<<

U+2+<

Pickup value for the
2

under voltage element

(high set)

X X X X X X 80

<<>

U+2+<+t>

Tripping delay for the
2

under voltage element

X X X X X X 0.04

U+1+>

Pickup value for the
1

overvoltage element (low

set)

X X X X X X 110

U+1+>+t>

Tripping delay for the
1

overvoltage element

X X X X X X 0.04

U>>

U+2+<

Pickup value for the
2

overvoltage element

(high set)

X X X X X x 120

U+2+>+t>

Tripping delay for the
2

overvoltage element

X X X X X X 0.04

Frequency measuring repe-
tition in periods

perio-
ds

X X X X X X 4

<(>)

f+1+<(>)

Pickup value for frequency
element 1

X X X X X X 4800

f+1+<(>)+t>

Tripping delay for
frequency element 1

X X X X X X 0.1

f2<(>)

f+2+<(>)

Pickup value for frequency
element 2

X X X X X X 4900

f+2+<(>)+t>

Tripping delay for frequency
element 2

X X X X X X 0.1

f3<(>)

f+3+<(>)

Pickup value for frequency
element 3

X X X X X X 5100

f+3+<(>)+t>

Tripping delay for frequency
element 3

X X X X X x 0.1



/df

Pickup value for rate of fre-
quency df/dt in

Hz/s

X X X X X X EXIT

1-3/dt

Measuring repetition for
df/dt

perio-
ds

X X X X X X 4



_1/3

1-3/dt

Vector surge tripping logic

X X X X X X 1PH



/df

Pickup value for vector
surge

X X X X X X 2.0



/df

Voltage threshold for fre-
quency, df/dt and vector
surge measuring

X X X X X X 20

Summary of Contents for HighTECH MRG3

Page 1: ...PROTECTION WITH MAINS SUPERVISION TIME OVERCURRENT PROTECTION AND EARTH CURRENT SUPERVISION HighTECH Line GENERATOR PROTECTION WITH MAINS SUPERVISION TIME OVERCURRENT PROTECTION AND EARTH CURRENT SUPERVISION Original document English Revision D MANUAL ...

Page 2: ...he right to update any portion of this publication at any time Information provided by SEG Electronics is believed to be correct and reliable However no responsibility is assumed by SEG Electronics unless otherwise expressly undertaken SEG Electronics 1994 2020 All rights reserved ...

Page 3: ... feature 31 4 7 4 Residual voltage 33 4 7 5 Behavior of MRG3 under different operating conditions 33 4 7 6 Blocking function set in compliance with requirements 33 4 8 Fault recorder 34 5 Operation and Settings 36 5 1 Display 36 5 2 Setting procedure 40 5 3 Systemparameters 40 5 3 1 Y Change over switch 40 5 3 2 Display of measurement values as primary quantity 40 5 3 3 Setting of measured seconda...

Page 4: ...on functions and assignment of the output relays 53 5 10 Indication of measuring values 55 5 10 1 Measuring indication for mains decoupling 55 5 10 2 Storage of min max values 55 5 10 3 Unit of the measuring values displayed 56 5 10 4 Indication of values measured for over current and earth fault protection 56 5 10 5 Units of the measuring values 57 5 10 6 Indication of fault data 58 5 10 7 Fault ...

Page 5: ...teps 75 7 8 1 System parameter 75 7 8 2 Parameter protection Voltage Frequency df dt protection 77 7 8 3 Time over current protection 79 7 8 4 Earth fault supervision 80 7 8 5 Earth fault supervision with directional feature 81 7 8 6 Determination of the earth fault direction MRG3 IER 81 7 8 7 Residual voltage protection 82 7 8 8 CB failure protection 82 7 8 9 Interface parameter 82 7 8 10 Paramet...

Page 6: ... with definite or inverse time characteristics integrated determination of earth fault direction for application to power system networks with isolated star point or earth fault compensation ER XR relay type two step protection for the residual voltage For applications where only individual protection functions are required SEG Electronics GmbH can of course also offer the following MR relays as i...

Page 7: ... Inverse RI Inverse RXIDG characteristic Reset mode selectable for inverse time characteristics Definite time element for short circuit fast trip Two step earth fault supervision Optionally sensitive watt metric directional earth fault detection with measurement of the residual voltage Optionally supervision of the residual voltage in two steps Two parameter sets Circuit breaker failure protection...

Page 8: ...n 3 1 Connections 3 1 1 Connection Diagrams Figure 3 1 Connection diagram Mains decoupling The measuring circuits can optionally be star or delta connected see chapter 4 3 1 Figure 3 2 MRG3 I Connection diagram Mains decoupling with time over current protection ...

Page 9: ...4 Connection diagram with time over current protection and earth fault protection Holmgreen circuit This connection can be used with three existing phase current transformers when combined phase and earth current measuring is required Disadvantage of the Holmgreen circuit At saturation of one or more C Ts the relay seemingly detects an earth current ...

Page 10: ...SEG Electronics GmbH Manual MRG3 10 DOK TD MRG3 Rev D Figure 3 5 Connection diagram with time over current protection and earth fault directional feature ...

Page 11: ...e residual voltage U can be generated internally in the secondary measuring circuit The device shall then be encod ed as described in chapter 3 1 8 Thus star connection of voltage transformers is imperative For the detection of residual voltage from the open delta winding it is possible to connect the voltage transformer directly to B1 and A2 Connection of voltage transformers in isolated compensa...

Page 12: ...SEG Electronics GmbH Manual MRG3 12 DOK TD MRG3 Rev D Figure 3 7 Connection diagram with detection of the residual voltage ...

Page 13: ...ge trans formers in isolated compensated grids is explained in chapter 4 7 3 3 1 3 Output relays The MRG3 is equipped with 5 output relays Apart from the relay for self supervision all protective functions can be optionally assigned 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 trip and alarm relays are working c...

Page 14: ... in phase U_L1 400V L2 Measuring range 0 600V in phase U_L2 L3 400V Measuring range 0 600V in phase U_L3 U_E 400V Measuring range 0 600V in phase U0 Based on the set value of the secondary transformers rated voltage a change over to the measur ing range is automatically detected by the MRG3 refer to chapter 5 3 3 This set value determines the secondary rated voltage of the device If the adjusted v...

Page 15: ...K TD MRG3 Rev D 15 Figure 3 9 Change over to of measuring range for phase voltages phase l1 and L2 Figure 3 10 Change over to of measuring range for phase voltage Phase L3 Selection of the measuring method to be used for residual voltage ...

Page 16: ...r detection of the residual voltage based on the three star connected phase voltages adjust the code plug to 3PHA The code plug s default position is 1 1 3 1 9 Low high range of the digital inputs The MRG3 is equipped with a power supply unit so that the supply voltage can be freely selected This means that the switching threshold of the digital inputs has to be defined dependent on the supply vol...

Page 17: ...Manual MRG3 SEG Electronics GmbH DOK TD MRG3 Rev D 17 3 2 Front plates Figure 3 12 Front plate MRG3 Figure 3 13 Front plate MRG3 IE ...

Page 18: ...SEG Electronics GmbH Manual MRG3 18 DOK TD MRG3 Rev D Figure 3 14 Front plate MRG3 IU0 Figure 3 15 Front plate MRG3 I ...

Page 19: ...Manual MRG3 SEG Electronics GmbH DOK TD MRG3 Rev D 19 Figure 3 16 Front plate MRG3 IER Figure 3 17 Front plate MRG3 UO ...

Page 20: ...ft side next to the LEDs The LEDs will light up red during parameterizing of the setting values next to their right side Remarks Due to the fact that there are a variety of protection functions it is not possible to assign each indi vidual function to one separate LED For this reason some of the measured values or parameters are indicated by simultaneous flashing of several LEDs Example To indicat...

Page 21: ...possible fault situation in the protected object The calculated actual current values are compared with the relay settings If a phase current ex ceeds the pickup value an alarm is given and after the set trip delay has elapsed the correspond ing trip relay is activated The relay setting values for all parameters are stored in a parameter memory EEPROM Electri cally Erasable Programmable Read only ...

Page 22: ...inal voltage of the input transformers Dependent on the application the input transformers can be connected in either delta or star The connection for the phase to phase voltage is the delta connection In star connection the measuring voltage is reduced by 1 3 During parameter setting the connection configuration either Y or has to be adjusted Figure 4 1 Input v t s in delta connection Figure 4 2 ...

Page 23: ...e time measurement of complete cycles whereby a new measurement is started at each voltage zero passage The in fluence of harmonics on the measuring result is thus minimized Figure 4 3 Determination of cycle duration by means of zero passages In order to avoid false tripping resulting from interference voltages and phase shifts the relay works with an adjustable measuring repetition refer to chapt...

Page 24: ... the measurement of the rate of change of frequency df dt Precondition for this is a load flow via the mains coupling point At mains failure the load flow changing then spontaneously leads to an increasing or decreasing frequency At active power deficit of the internal power station a linear drop of the frequency occurs and a linear in crease occurs at power excess Typical frequency gradients duri...

Page 25: ...lopment Power relays are able to pick up within 200 ms but they cannot prevent power to rise to short circuit values too Since power changes are also caused by sudden loaded alternators the use of power relays can be problematic Whereas the MRG3 detects mains failures within 60 ms without the restrictions described above because they are specially designed for applications where very fast decoupli...

Page 26: ...produces a voltage difference U is built between Up and U1 Fig 4 4 Figure 4 4 Equivalent circuit for synchronous generators running in parallel with the mains Figure 4 5 Changement of the rotor displacement angle at sudden load of the generator The rotor displacement angle between stator and rotor is depending on the mechanical moving torque of the generator shaft The mechanical shaft power is bal...

Page 27: ... In case of mains failure or auto reclosing the generator suddenly feeds a very high consumer load The rotor displacement angle is suddenly increases and the voltage vector U1 changes its direction U1 Fig 4 6 and 4 7 Figure 4 7 Changement of the rotor displacement angle at sudden load of the generator ...

Page 28: ... the vector surge element occurs only if in case of a vector surge the vector surge angle exceeds the set value simultaneously in all three phases at the same time Application hint Although the vector surge relay guarantees very fast and reliable detection of mains failures under nearly all operational conditions of mains parallel running alternators the following borderline cas es however have to...

Page 29: ...er supply for internal requirements is endangered and a subsequent synchronized changeover to the mains can only be done after manual reset of the over current protection To avoid such a situation the alternator C B s must have a delayed short circuit protection whose time delay is at least long enough to allow mains decoupling by the vector surge relay 4 5 4 Voltage threshold value for frequency ...

Page 30: ...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 9 Generator stator earth fault protection 4 7 2 System earth fault protection With the generator neutral point earthed as shown in Figure 4 10 the MRG3 picks up only to earth faults at consumer or line side It does not pick up to earth faults on the g...

Page 31: ...g on the voltage transformer connections see Table 4 1 Total current can be measured by connecting the unit either to a ring core C T or to current trans formers in a Holmgreen circuit However maximum sensitivity is achieved if the MRG3 protective device is connected to a ring core C T see Figure 3 4 The pick up values IE and IE active or reactive current component for cos or sin method for ER rel...

Page 32: ...ltage UE 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 capacity current IC b lags behind the residu al voltage at 90 Figure 4 12 Phase position between the residual voltage and zero sequence current for faulte...

Page 33: ...le free pro grammable free pro grammable free pro grammable 2 blocking input is released released instantane ously released instanta neously released after 1 s released after 5 s released after 5 s 3 supply voltage is switched on blocked for 200 ms blocked for 200 ms blocked for 1 s blocked for 1 s blocked for 1 s 4 3ph measuring volt is suddenly applied released released blocked for 1 s blocked f...

Page 34: ...sen the complete memory is divided into the relevant number of par tial segments If this max number of fault event has been exceeded the fault recorder blocks any further recordings in order to prevent that the stored data are written over After the data have been read and deleted the recorder to ready again for further action Writing over If 1 3 or 7 recordings are chosen the relevant number of p...

Page 35: ... Each memory segment has a specified storage time which permits setting of a time prior to the trigger event Via the interface RS485 the data can be read and processed by means of a PC HTL PL Soft4 The data is graphically edited and displayed Binary tracks are re corded as well e g activation and trip ...

Page 36: ... current in L2 Apparent current in L3 Residual voltage U0 Earth current Active component EP Reactive component EQ Angle IE and U0 SELECT RESET one time for each value U L1 U L2 U L3 U L1 L2 U L2 L3 U L3 L1 f f min f max df L1 df L2 df L3 df L1 L2 df L2 L3 df L3 L1 df min df max df df min df max I L1 I L2 I L3 U E I E I E EP I E EQ U I E 5 10 Display of date and time Year Y 06 Month M 01 Day D 04 H...

Page 37: ...value in seconds SELECT RESET one time for each value U 1 U 1 t 5 4 1 overvoltage high set tripping delay of high set element setting value in setting value in seconds SELECT RESET one time for each value U 2 U 2 t 5 4 1 frequency measuring repetition T setting value in periods SELECT RESET f 5 4 2 frequency element f1 tripping delay of frequency element f1 setting value in Hz setting value in sec...

Page 38: ...ET one time for each value IE 1 t 5 6 6 Reset Mode 0s 60s SELECT RESET IE 1 t 5 6 7 Earth short circuit IE Tripping delay for IE in forward direction Setting value in Setting value in seconds SELECT RESET one time for each value I 2 I 2 t 5 6 8 5 6 9 Earth short circuit IE Tripping delay for IE in reverse direction Setting value in Setting value in seconds SELECT RESET one time for each value I 2 ...

Page 39: ...ait SELECT RESET for 3s 5 7 1 Blocking EXIT until max setting value until min setting value LED of blocked parameter MR allg Save parameter SAV ENTER MR allg Save parameter SAV ENTER for aprrox 3 s MR allg Software Version First part e g D02 Sec part e g 6 01 TRIP one time for each part MR allg Manual trip TRI TRIP 3 mal MR allg Inquire password PSW SELECT RESET ENTER MR allg Relay tripped TRIP TR...

Page 40: ...er for Indication of measured values as primary values on the display has to be set to SEK see chapter 5 3 2 With the aid of this parameter the MRG3 is capable of recognizing whether the calculation has to be based on 0 150 V or on the voltage range from 0 600V Upon adjustment of a rated secondary voltage of 138 V all switching points of the measuring range 0 600 V will be calculated If this param...

Page 41: ...e adapted FFT algorithm requires the nominal frequency of the object to be protected as a pa rameter for correct digital sampling and filtering of the input currents By pressing SELECT the display shows f 50 or f 60 The desired nominal frequency can be adjusted by or and then stored with ENTER 5 3 7 Selection between vector surge function or df dt supervision The MRG3 provides two methods for the ...

Page 42: ...ble 5 2 Function of the digital inputs With the setting B_S2 the blocking input D8 E8 is used as parameter set change over switch With the setting R_S2 the reset input D8 E8 is used as parameter set change over switch With the setting B_FR the fault recorder is activated immediately by using the blocking input On the front plate the LED FR will then light up for the duration of the recording With ...

Page 43: ... and in the range of 0 04 s to 50 s and can be stored with the push button ENTER When setting the tripping delay to EXIT the value is infinite meaning only warning no tripping Note When adjusting the correct positioning of the coding plugs should again be checked see chapter 3 1 8 5 4 2 Number of measuring repetitions T for frequency functions In order to avoid false tripping of the unit at short ...

Page 44: ... relay depends upon the number of set measuring repeti tions T periods and amounts to T tf min 2 49 T 1 20 ms 50 69 T 49 50 ms 1 s 70 99 T 69 100 ms 2 s When setting the tripping delay to EXIT by pressing push button up to the maximum setting value the corresponding tripping relay is blocked Pickup of the frequency element is however dis played on the front plate by the corresponding LED an assign...

Page 45: ...ge supervision is set a value in angular degree is indicated at the display The pickup value requested can be adjusted by pushbuttons and in the range of 2 to 22 LED _df lights up green during this setting After adjustment of the sensitivity for 1Pha or 3 Pha LED 1 3_dt will be flashing in red Parameter setting of frequency gradient speed The pickup value of frequency gradient parameter df can be ...

Page 46: ... tripping time and time factor setting t will flash up This warning signal is an indication for the user to align the tripping time and or the time factor to the modified operating mode and or tripping time characteristic The warning signal continues flashing until the tripping time and or time factor have been newly pa rameter used If within a period of 5 minutes time for release of parameters ne...

Page 47: ...ain at recurring fault current 5 5 5 Pick up value for high set element The current setting value of this parameter is related to the generator s rated current of the relay and is indicated in When the current setting for high set element is set out of range EXIT appears on the display the high set element of the over current relay is blocked The high set element can be blocked via terminals E8 D8...

Page 48: ...rator s nominal earth fault current For the relay version MRG3 IER the indicated value relates to the effective portion of the earth current for compensated grids cos procedure or to the reactive portion for isolated grids and it is also displayed as percentage of the nominal earth current see chapter 4 7 3 The setting is accompanied by the LEDs IE 1 5 6 4 WARN TRIP changing over applies to MRG3 I...

Page 49: ...to operate selectively at occurrence of forward faults When setting tripping times for forward faults and backward faults to the same value the relay will trip with the same time delay i e without directional feature 5 6 7 Reset mode for tripping characteristics in earth current path Similar to chapter 5 5 4 Flashing of the LEDs IE 1 t upon this setting 5 6 8 Pick up value for earth faults resp ea...

Page 50: ...ase currents have dropped to 2 x IN within tCBFP The relay that is as signed the failure protec tion function will drop after expiry of no more than 2 54 s The LEDs CB t will be flashing upon this parameterisation 5 7 2 Adjustment of the slave address By pressing push buttons and the slave ad dress can be set in the range of 1 32 The display shows RS1 to RS32 5 7 3 Setting of Baud rate applies for...

Page 51: ...ase that the fault recorder is triggered although there is no more memory available If the respective partition was defined as not being over writeable and the maximal number of rec orded disturbance events was assigned the LED FR starts flashing refer to chapters 4 8 und5 10 10 5 8 3 Adjustment of trigger occurrences There is a choice between four different occurrences P_UP Pickups Storage is ini...

Page 52: ...th m 00 day d 00 Time hour h 00 minute m 00 second s 00 The clock starts with the set date and time as soon as the supply voltage is switched on The time is safe guarded against short term voltage failures for at least 6 minutes Note The window for parameter setting of the clock is located behind the measuring value display The parameter window can be accessed via the SELECT RESET key ...

Page 53: ...I Over current NO_B I 1 I Short circuit BLOC I 2 U0 Residual voltage step 1 NO_B U0 1 U0 Residual voltage step 2 NO_B U0 2 IE Earth current step 1 NO_B IE 1 IE Earth current step 2 NO_B IE 2 tCB Circuit breaker failure protection NO_B CB only one of the two functions can be activated not available in MRG3 IER Table 5 4 Blockage function for two parameter sets After the assignment mode has been act...

Page 54: ... _ _ _ U 2 tU Tripping X 1 _ _ _ U 2 t f1 Alarm _ _ _ _ f 1 tf1 Tripping X 1 _ _ _ f 1 t f2 Alarm _ _ _ _ f 2 tf2 Tripping X 1 _ _ _ f 2 t f3 Alarm _ _ _ _ f 3 tf3 Tripping X 1 _ _ _ f 3 t Tripping X 1 _ _ _ df df dt Tripping X 1 _ _ _ df I Alarm _ _ _ _ I 1 tI Tripping X _ 2 _ _ I 1 t I Alarm _ _ _ _ I 2 tI Tripping X _ 2 _ _ I 2 t U0 Alarm _ _ _ _ U0 1 tU0 Tripping X _ _ 3 _ U0 1 t U0 Alarm _ _ ...

Page 55: ...work system s quality Always the highest and lowest values of each cycle are measured and stored until the next reset refer to chapter Reset 5 10 9 Min max frequency measuring The MRG3 ascertains the actual frequency from each cycle of the system voltage These measur ing values are entered into the min max storage The latest entered min max values replace the previously stored values Dependent on ...

Page 56: ...ge as follows Indication as Range Unit Secondary voltage 000V 999V V Primary voltage 00V 999V 1k00 9k99 10k0 99k0 100k 999k 1M00 3M00 V kV kV kV MV Table 5 6 Units of the display 5 10 4 Indication of values measured for over current and earth fault protection During normal operation the following measuring values for over current and earth fault protec tion can be displayed Applies to MRG3 I MRG3 ...

Page 57: ...MA for rated transformer current 2kA and up Earth current Indication as Range Unit Secondary current Active portion IP Reactive portionl IQ 000 15 0 00 15 00 15 x In x In x In Primary earth current 000 999 k000 k999 1k00 9k99 10k0 99k0 100k 999k 1M00 2M00 A kA kA kA kA MA Active portion IP 00 999 k00 k99 1k0 9k9 10k 99k M10 M99 1M0 2M0 A kA kA kA MA MA Reactive portion IQ 00 999 k00 k99 1k0 9k9 10...

Page 58: ...ediately switched off after tripping further fault data will be recorded The MRG3 is provided with a fault value recorder for max 16 fault occurrences In the event of ad ditional trippings always the oldest data set is written over For fault indication not only the trip values are recorded but also the status of LEDs Fault values are indicated when push buttons or are pressed during normal measuri...

Page 59: ...ipping time in of tI tI I 1 t Residual voltage U0 U E Earth current Earth current active portion Earth current reactive portion IE IE_EP IE_EQ IE IE EP IE EQ Expired tripping time in of tIE tIE E 1 t Circuit breaker failure protection tCBFP CB t Time stamp Date Y 99 M 03 D 10 Time h 17 m 21 s 14 Table 5 7 Fault data indications on display Note It is only possible to call up those measuring values ...

Page 60: ...he same effect as the SELECT RESET push button see also communication protocol of RS485 interface Automatic Reset At each excitation of a protection function The display can only be reset when a pickup protection element is not present anymore otherwise TRIP remains in display During resetting of the display the parameters are not affected 5 10 10 Delete of disturbance records By repeated setting ...

Page 61: ...de activate the two steps Press the push button ENTER thus entering into the setting mode Now set the parameters U and U to EXIT to block the under voltage functions After that press the SELECT RESET for app 3 s to reset the LEDs and TRIP message The under voltage tripping after power on can also be eliminated by applying three phase rated voltages after power on and reset the LED and TRIP message...

Page 62: ...ral voltages will be measured and evaluated Delta connection Phase to phase voltages will be measured and evaluated To assure an efficient operation of the relay the adjusted rated frequency f 50 60 Hz has to be concordant with the system frequency 50 or 60 Hz 6 4 Test with transformer secondary current Secondary injection test 6 4 1 Equipment required to test voltage functions Voltmeter and frequ...

Page 63: ...e MRG3 relay a three phase voltage source with adjustable voltage and frequency is required Figure 6 1 shows an example of a three phase test circuit ener gising the MRG3 relay during test The three phase voltages are connected to the relay in Y connection Figure 6 1 Three phase test circuit for the voltage test ...

Page 64: ...asures only the fundamental component of the input signals the harmonics will be rejected by the internal DFFT digital filter Whereas the RMS metering instrument measures the RMS value of the input signals 6 4 4 Checking the pick up and release values for over under voltage Note When the measuring voltage is connected or disconnected vector surge tripping or df dt tripping can occur In order to en...

Page 65: ...an be tested in the similar manner as in chapter 6 4 6 for over under voltage functions 6 4 8 Checking of the vector surge function Note With the help of an advanced relay test equipment a phase shift vector surge on the voltage sig nal can be obtained to test the vector surge function of MRG3 re lay If there is no such testing fa cility available a very simple simulation circuit may be used to te...

Page 66: ...eter and voltmeter class 1 or higher auxiliary voltage source supply with the voltage corresponding to the rated data pn the type plate single phase alternating current source adjustable from 0 to 4 x Un single phase alternating current source adjustable from 0 to 1 2 x Un only required for the relay version MRG3 IER with directional feature timer to measure the operating time Accuracy class 10 ms...

Page 67: ...ndicated measured value can now be checked by means of an ammeter For a relay with rated current In 5A for example a secondary current impression of 1A should be indicated on the display with about 0 2 0 2 x In When parameter Iprim SEK is set the indica tion is 0 2 x In and at 5 the indication is 1 00 A The current can be also impressed into the other current input circuits Phase 2 terminals B5 B6...

Page 68: ...d have a deviation of less than 3 of the set value or 10 ms DEFT Accuracy for inverse time characteristics refer to EN60255 3 Repeat the test on the other phases or with the inverse time characteristics in the similar manner In case 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 read from the ...

Page 69: ...e 6 4 shows an example of a single phase test circuit with adjustable voltage and current test ing a re lay with directional feature one of the input voltage terminals B1 A2 shall be applied to the relay with a constant value within its effective range The other input current terminals B1 B2 and phase angle shall be appropriately varied With the aid of phase angle indicated on the display the corr...

Page 70: ...the similar manner as the secondary in jection test described above With the difference that the protected power system should be in this case connected to the installed relays under test on line and the test currents and voltages should be injected to the relay through the current and voltage transformers with the primary side energized Since the cost and potential hazards are very high for such ...

Page 71: ...out to pickup ratio U U 99 U U 101 Returning time 60 ms Time lag error class index E 10 ms Minimum operating time 40 ms 7 1 1 Influences on the voltage measurement Auxiliary voltage in the range of 0 8 UH UHN 1 2 no additional influences can be measured Frequency Within the range from 0 9 f fN 1 1 0 2 Hz only the first harmonic is evaluated 7 2 Frequency measurement Rated data Rated frequency 50Hz...

Page 72: ...al influences can be measured Frequency Within the range from 0 9 f fN 1 1 0 2 Hz only the first harmonic is evaluated Influences on delay times no additional influences can be measured 7 4 Measuring input Residual voltage Rated data Nominal voltage UN 100V or 400V see chapter 3 1 8 code plugs Measuring range 0 1 5 x UN Measuring accuracy 2 from measuring value or 1 from rated value Power consumpt...

Page 73: ... A 0 1 VA Thermal withstand capability In current circuit dynamic current withstand one halfwave 250 x IN for 1 s 100 x IN for 10 s 30 x IN continuously 4 x IN Dropout to pickup ratio MRG3 IE 95 MRG3 IER 97 Returning time 100 ms Minimum operating time 100 ms 7 5 1 Influences on the earth current measuring Auxiliary voltage in the range 0 8 UH UHN 1 2 no additional influences can be measured Freque...

Page 74: ...s The output relays have with the following characteristics Maximum breaking capacity 250 V AC 1250 VA continuous current 5 A For DC voltage ohmic L R 40 ms L R 70 ms 300 V DC 0 2 A 60 W 0 13 A 40 W 0 12 A 36 W 250 V DC 0 25 A 62 W 0 19 A 48 W 0 09 A 22 W 110 V DC 0 5 A 55 W 0 4 A 40 W 0 2 A 22 W 60 V DC 0 9 A 54 W 0 6 A 36 W 0 36 A 21 W 48 V DC 1 2 A 58 W 0 8 A 40 W 0 5 A 24 W 30 V DC 5 A 150 W 3...

Page 75: ...ominal generator voltage 0 001 0 05 0 20 0 002 0 20 0 50 0 005 0 50 1 00 0 01 1 00 2 00 0 02 2 00 5 00 0 05 5 00 10 0 0 1 10 0 20 0 0 2 20 0 50 0 0 5 50 0 100 1 100 200 2 200 500 I_L1 L2 L3_prim sek 0 002 50 0 kA Primary nominal transformer voltage 0 001 kA 0 002 0 200 0 002 kA 0 200 0 500 0 005 kA 0 500 1 00 0 01 kA 1 00 2 00 0 02 kA 2 00 5 00 0 05 kA 5 00 10 0 0 1 kA 10 0 20 0 0 2 kA 20 0 50 0 I...

Page 76: ...0 kA Primary nominal trans former current for earth fault 0 001 kA 0 002 0 200 0 002 kA 0 200 0 500 0 005 kA 0 500 1 00 0 01 kA 1 00 2 00 0 02 kA 2 00 5 00 0 05 kA 5 00 10 0 0 1 kA 10 0 20 0 0 2 kA 20 0 50 0 IEN 0 01 50 0 kA Primary nominal generator current for earth fault 0 001 kA 0 001 0 200 0 002 kA 0 200 0 500 0 005 kA 0 500 1 00 0 01 kA 1 00 2 00 0 02 kA 2 00 5 00 0 05 kA 5 00 10 0 0 1 kA 10...

Page 77: ...T 2 99 periods 1 2 99 f1 f3 30 49 99 EXIT 50 01 70 Hz1 40 59 99 EXIT 60 01 80 Hz2 0 1 30 00 47 90 0 01 48 00 49 99 0 01 50 01 52 00 0 1 52 10 70 00 0 1 40 00 57 90 0 01 58 00 59 99 0 01 60 01 62 00 0 1 62 10 80 00 0 03 Hz tf1 tf3 tf min 3 300 s EXIT 0 02 0 06 1 0 0 05 1 0 2 0 0 1 2 0 5 0 0 2 5 0 10 0 0 5 10 0 20 0 1 0 20 0 50 0 2 0 50 100 5 0 100 200 10 0 200 300 1 or 25 ms df 0 2 10 Hz s EXIT 0 1...

Page 78: ...the rated voltage In order to prevent faulty tripping the effective area of the vector surge supervision can be limited by means of the parameter UB Three Phase Vector Surge Supervision 3 of 3 1Ph on the Display Within the Area Safe Area the trip decision depends on the set Angle Delta phi only please re fer to figure Three Phase Vector Surge Supervision Within the Area Unsafe Area a trip decision...

Page 79: ...Char Normal Inverse Type A Very Inverse Type B Extremely Inverse Type C RI Inverse Long Time Inverse NINV VINV EINV RINV LINV 0 05 10 EXIT inverse time 0 01 0 05 0 5 0 02 0 5 1 0 0 05 1 0 2 0 0 1 2 0 5 0 0 2 5 0 10 0 3 of the measuring value of the current or 20ms see EN 60255 3 tI Reset Reset Mode for tripping times 0 s 60 s I 20 400 EXIT 1 20 50 2 50 100 5 100 200 10 200 400 3 of the set value o...

Page 80: ...Long Time Inverse RXIDG Kennlinie NINV VINV EINV RINV LINV RXID 0 05 10 EXIT 0 05 1 0 EXIT only RXIDG inverse time 0 01 0 05 0 5 0 02 0 5 1 0 0 05 1 0 2 0 0 1 2 0 5 0 0 2 5 0 10 0 3 related to the measured current value and 20ms re spectively see EN 60255 3 tIE Reset Reset Mode for tripping times 0s 60s IE 1 400 EXIT 0 1 1 5 0 2 5 10 0 5 10 20 1 20 50 2 50 100 5 100 200 10 200 400 3 of the set val...

Page 81: ... 20 1 20 45 3 of the set value or 0 3 IN tIE V tIE R 0 1 300 s EXIT 0 1 0 1 5 0 0 2 5 0 10 0 0 5 10 20 1 0 20 50 2 0 50 100 5 0 100 200 10 0 200 300 3 or 80 ms Table 7 5 Earth fault supervision with directional feature Tripping time in forward direction tripping range Tripping time in backward direction blocking range see chapter 4 7 3 7 8 6 Determination of the earth fault direction MRG3 IER Meas...

Page 82: ...of the set value or 1 from UN tU0 0 04 300 s EXIT 0 02 0 04 1 0 0 05 1 0 2 0 0 1 2 0 5 0 0 2 5 0 8 5 0 5 10 20 1 0 20 50 2 0 50 100 5 0 100 200 10 0 200 300 1 or 20ms Table 7 6 Residual voltage protection 7 8 8 CB failure protection LED Setting range Step range Tolerance tCBFP 0 1 2 00s EXIT 0 02 0 10 1 00 0 05 1 00 2 00 Table 7 7 CB failure protection 7 8 9 Interface parameter Function Parameter ...

Page 83: ...able for MRG3 I MRG3 IU0 MRG3 IE MRG3 IER 10 00 s 5 00 s 2 50 s 1 25 s 50 Hz 8 33 s 4 16 s 2 08 s 1 04 s 60 Hz Pre Trigger time 0 1 s maximum 10 00 s 50 Hz 0 1 s maximum 8 33 s 60 Hz FR Storage of recording at occurrence of an event P_UP TRIP A_PI TEST 7 9 Parameter for the fault recorder Upon reservation of all storage places a new trigger alarm will be given and the latest recorded event is writ...

Page 84: ...pe A 𝑡 0 14 𝐼 𝐼𝑆 0 02 1 𝑡𝐼 𝑠 Very Inverse Type B 𝑡 13 5 𝐼 𝐼𝑆 1 𝑡𝐼 𝑠 Extremely Inverse Type C 𝑡 80 𝐼 𝐼𝑆 2 1 𝑡𝐼 𝑠 Long Time Inverse 𝑡 120 𝐼 𝐼𝑆 1 𝑡𝐼 𝑠 RI Inverse Time 𝑡 1 0 339 0 236 𝐼 𝐼𝑆 𝑡𝐼 𝑠 RXIDG characteristic 𝑡 5 8 1 35 ℓ𝑛 𝐼 𝐼𝑠 𝑡𝐼 𝑠 Where t tripping time tI time multiplier I fault current Is Starting current ln natural logarithm only for earth current ...

Page 85: ...e 7 1 Normal Inverse Typ A Figure 7 2 Very Inverse Typ B 1 2 3 4 5 6 7 8 910 20 I IS 0 1 1 10 100 1000 t s tI 0 05 0 1 0 2 0 3 0 4 0 5 0 6 0 8 1 0 1 4 2 0 3 0 4 0 6 0 8 0 10 0 1 2 3 4 5 6 7 8 910 20 I IS 0 1 1 10 100 1000 t s tI 0 05 0 1 0 2 0 3 0 4 0 5 0 6 0 8 1 0 10 0 1 4 2 0 3 0 4 0 6 0 8 0 ...

Page 86: ... Typ C Figure 7 4 RI Inverse 1 2 3 4 5 6 7 8 910 20 I IS 0 01 0 1 1 10 100 1000 t s tI 0 05 0 05 0 1 0 1 0 2 0 3 0 4 0 5 0 6 0 8 1 0 10 0 1 4 2 0 3 0 4 0 6 0 8 0 1 2 3 4 5 6 7 8 910 20 I IS 0 1 1 10 100 t s tI 10 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 05 ...

Page 87: ...XIDG characteristic 1 2 3 4 5 6 7 8 910 20 I IS 0 1 1 10 100 1000 10000 t s tI 1 0 2 0 10 0 8 0 6 0 5 0 4 0 3 0 0 8 0 6 0 5 0 4 0 3 0 2 0 1 0 05 1 2 3 4 5 6 7 8 910 20 30 40 506070 I IS 0 01 0 1 1 10 t s tI 0 9 0 9 0 9 0 9 0 8 0 8 0 7 0 7 0 6 0 6 0 5 0 5 0 4 0 4 0 3 0 3 0 2 0 2 0 1 0 1 0 05 0 05 ...

Page 88: ... current I1 I5 Earth fault protection 1 Earth current 1 A rated current 5 A rated current Residual voltage E1 E5 U0 Directional feature in earth path1 Residual voltage supervision R Housing 12TE 19 rack Flush mounting A D Communication protocl RS485 Pro Open Data MODBUS RTU M Please leave box empty if option is not desired 1 only in combination with time over current protection Technical data subj...

Page 89: ...Relay functions Password Date Adjustment of the parameter Adjustment of date and time Relay type Actual settings Symbol LED Function MRG3 MRG3 I i MRG3 UO UO MRG3 IE IE MRG3 IOU MRG3 IER IER Year settings Year x x x x x x Y 00 Month settings Month x x x x x x M 01 Day settings Day x x x x x x D 01 Settings of the hours Hours x x x x x x h 00 Settings of the minutes Minutes x x x x x x m 00 Setting...

Page 90: ...al transformer voltage in phase kA X X X X sek I_L1 L2 L3 rated I L1 L2 L3 2 Primary nominal generator voltage in phase kA X X X X sek U0_prim U E 1 Primary residual voltage kV X X X sek U0_sec U E 2 Secondary nominal transformer voltage for the residual voltage V X X X 400 U0_rated U E 3 Primary nominal value for residual voltage kV X X X sek IE_prim I E 1 Primary nominal transformer current for ...

Page 91: ...2nd overvoltage element high set X X X X X x 120 tU U 2 t Tripping delay for the 2nd overvoltage element S X X X X X X 0 04 T f Frequency measuring repe tition in periods perio ds X X X X X X 4 f1 f 1 Pickup value for frequency element 1 Hz X X X X X X 4800 tf1 f 1 t Tripping delay for frequency element 1 S X X X X X X 0 1 f2 f 2 Pickup value for frequency element 2 Hz X X X X X X 4900 tf2 f 2 t T...

Page 92: ...sidual voltage element X X 10 U0 t U0 2 t Tripping delay for the 2nd residual voltage element s X X 0 1 IE IE 1 Warning tripping of the IE element X X warn IE IE 1 Pickup value for earth over current X X 1 IE Char IE 1 Tripping characteristic for earth over current element X DEFT tIE IE 1 t Tripping time factor for the earth over current el ement s X 0 04 tIE IE 1 t Tripping time factor for earth ...

Page 93: ...U0 MRG3 IER RS Slave address of the serial interface X X X X X X RS1 RS Baud Rate Bau d X X X X X X 9600 RS Parity Check X X X X X X even Blocking function Relay type Default settings Actual settings Symbol LED MRG3 MRG3 I MRG3 U0 MRG3 IE MRG3 IU0 MRG3 IER Set 1 Set 2 Set 1 Set 2 Block ing No block ing Block ing No block ing Block ing No block ing Block ing No block ing U U 1 X X X X X X X X U U 2...

Page 94: ...Ausl U 2 t X X X X X X X f1 Alarm f 1 X X X X X X f1 Ausl f 1 t X X X X X X X f2 Alarm f 2 X X X X X X f2 Ausl f 2 t X X X X X X X f3 Alarm f 3 X X X X X X f3 Ausl f 3 t X X X X X X X Ausl df X X X X X X X df dt Ausl df X X X X X X X I Alarm I 1 X X X X I Ausl I 1 t X X X X X I Alarm I 2 X X X X I Ausl I 2 t X X X X X U0 Alarm U0 1 X X X U0 Ausl U0 1 t X X X U0 Alarm U0 2 X X U0 Ausl U0 2 t X X X ...

Page 95: ...e DI_2 input Default set tings Actual settings Default settings Actual settings Low plugged X X High not plugged Measuring range residual voltage Code jumper Measuring voltage range phase U_L1 Measuring voltage range Phase U_L2 Measuring voltage range phase U_L3 Default settings Actual settings Default settings Actual settings Default settings Actual settings 100V 400V X X X Range of measuring met...

Page 96: ... MRG3 D01 1 00 mit ProOpenData Protokoll MRG3 I D02 1 00 MRG3 U0 D03 1 00 MRG3 IE D04 1 00 MRG3 IU0 D05 1 00 MRG3 IER D06 1 00 MRG3 M D51 1 00 mit Modbus Protokoll MRG3 I M D52 1 00 MRG3 U0 M D53 1 00 MRG3 IE M D54 1 00 MRG3 IU0 M D55 1 00 MRG3 IER M D56 1 00 Technical data subject to change without notice ...

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