Seg MRI3-C User manual

MRI(K)3-C –Digital time overcurrent relay with Control
function and auto reclosing

2TB MRI(K)3-C 03.02 E
Contents
1 Introduction and Application
2 Characteristics and Features
3 Design
3.1 Connections
3.1.1 Analog input circuits
3.1.2 Output relays
3.1.3 Digital inputs
3.1.4 Low/High range of the digital Inputs
3.2 Password
3.2.1 Code jumpers
3.2.2 Password programming
3.2.3 Function of the output relays
3.3 Front plates
3.3.1 Indicating LEDs
3.3.2 Adjusting LEDs
3.4 Front plates (for ER/XR-relay types)
3.4.1 Indicating LEDs
3.4.2 Adjusting LEDs
4 Working principle
4.1 Analog circuits
4.2 Digital circuits
4.3 Status descriptions
4.3.1 „Inactive“
4.3.2 „Reclaim time“ tR
4.3.3 „AR-ready“
4.3.4 „AR-starting“ (dead time)
4.3.5 „AR-cycle“ (auto reclosing)
4.3.6 „AR-blocked“
4.3.7 „Fast Trip Mode“
4.3.8 „Blocking mode“
4.3.9 „Activating of AR“
4.3.10 Description of the status transition
4.3.11 AR information inputs
4.4 Functional sequence
4.4.1 Switching on MRIK3-C
4.4.2 Circuit breaker manual closing
4.4.3 Circuit breaker manual open
4.4.4 Starting AR
4.4.5 Unsuccessful reclosing
4.4.6 Successful reclosing
4.4.7 Repeated reclosing
4.4.8 Supervision of the circuit breaker ready
information
4.4.9 External blocking
4.4.10 Time sequence diagrams of MRIK3-C
4.4.11 The unit is programmed for two shots,
successful AR at the second shot
4.4.12 The unit is programmed for two shots,
unsuccessful AR
4.4.13 Manual closing of the circuit breaker to
faulty lines
4.4.14 Unsuccessful AR
4.5 Earth fault protection
4.5.1 Generator stator earth fault protection
4.5.2 System earth fault protection
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 the operating assignment
4.7.5 Saving the operating assignment
4.7.6 Remote switching on and off of the C.B.
4.7.7 Switching on or off the C.B. via the front
panel (LCAL)
4.7.8 Handling of the control function
4.7.9 Display for the control functions
4.7.10 LED-indication under normal mode
4.7.11 LED-indication auto reclosing conditions
(AR)
4.8 Requirement on the Main Current
Transformers
5 Operation and Adjustments
5.1 Displayed text for parameter settings
5.2 Setting procedure
5.3 Parameter levels
5.4 System parameters
5.4.1 Presentation of Measuring Values as
Primary Quantities on the Display
(Iprim Phase)
5.4.2 Display of residual voltage UE as primary
quantity (Uprim/Usec)
5.4.3 Voltage transformer connection for resi-
dual voltage measuring (3pha/e-n/1:1)
5.4.4 Operation cycle counter
5.4.5 I2*t Operation cycle counter
5.4.6 Rated -Frequency
5.4.7 Indication of pickup
5.4.8 Parameter Set Changeover Switch (P2)
5.5 Protection Parameters
5.5.1 Pickup current for phase overcurrent
element
5.5.2 Trip Characteristics for the Phase Over-
current Element (I>)
5.5.3 Tripping Time or Time Factor for the
Phase Overcurrent Element
5.5.4 Fast/Time tripping by switch ON of the
CB for the overcurrent lement
5.5.5 Reset Mode for the Trip Characteristics
in the Phase Current Path
5.5.6 Current setting for high set element
5.5.7 Trip delay for high set element
5.5.8 Fast/Time tripping by switch ON of the
CB for the short ciruit element
5.5.9 Pickup value for residual voltage (UE)
(ER/XR-relay types)

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5.5.10 Pickup current for earth fault element (IE>)
5.5.11 WARN/TRIP changeover
5.5.12 Time current characteristics for earth fault
element (for E/X-relay types)
5.5.13 Tripping Time or Time Factor for the
Earth Fault Element
5.5.14 Fast/Time tripping by switch ON of the
CB for the earth fault low set element
5.5.15 Reset mode for inverse time tripping in
earth current path
5.5.16 Current setting for high set element of
earth fault supervision (IE>>)
5.5.17 Trip delay for high set element of earth
fault supervision
5.5.18 Fast/Time tripping by switch ON of the
CB for the earth fault high set lement
5.5.19 COS/SIN Measurement
(ER/XR-relay type)
5.6 AR Parameter
5.6.1 Number of AR shots
5.6.2 Fault time (tF)
5.6.3 Dead time (tD)
5.6.4 Close impulse time (tCI)
5.6.5 Reclaim time (tR)
5.6.6 Fault time activation
5.7 Control functions
5.7.1 Block/Trip-time
5.7.2 Time delay for ext. Trip
5.7.3 Dead time for Trip/Restore
5.7.4 CB failure protection
5.7.5 Release of the pick up relay for CB
failure protection
5.8 Interface Parameters
5.8.1 Adjustment of the Slave-Address (RS)
5.8.2 Adjustment of the Baud-Rate
5.8.3 Adjustment of the Parity
5.9 Fault Recorder (FR)
5.9.1 Fault Recorder
5.9.2 Number of fault recordings
5.9.3 Adjustment of the Trigger Event
5.9.4 Pre-Trigger time (Tvor)
5.10 Setting of the clock
5.11 Additional functions
5.11.1 Blocking the protection functions
5.11.2 Assignment of the output relays
5.11.3 Assignment of the AR functions
5.11.4 Function assignment 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
5.12.3 Indication of fault data
5.12.4 Fault Memory
5.13 Reset
5.13.1 Erasure of the Fault Memory
6 Notes on Relay Tests and Commissioning
6.1 Connection of the auxiliary voltage
6.2 Testing of Output Relays and LEDs
6.3 Secondary injection test
6.3.1 Test equipment
6.4 Example of test circuit for MRI(K)3-C
relays without directional feature
6.4.1 Checking the input circuits and
measured values
6.4.2 Checking the operating and resetting
values of the relay
6.4.3 Checking the relay operating time
6.4.4 Checking the high set element of the
relay
6.4.5 Test circuit for MRI(K)3 relay with earth-
current directional recognition
(ER/XR models)
6.4.6 Checking the auto reclosing function
6.4.7 Checking the circuit breaker position
6.4.8 Checking the AR blocking function
6.4.9 Checking the external blocking and
reset functions
6.4.10 Testing the external blocking with
Block/Trip function
6.4.11 Test of the CB failure protection
6.5 Primary Test
6.6 Maintenance
7 Technical Data
7.1 Measuring input
7.2 Common data
7.3 Setting ranges and steps
7.3.1 System parameter
7.3.2 Time overcurrent protection (I-type)
7.3.3 Earth fault protection (E/X-type)
7.3.4 Earth fault protection (ER/XR-type)
7.3.5 AR Parameter
7.3.6 Control Function
7.3.7 Interface parameter
7.3.8 Parameter for the fault recorder
7.4 Tripping characteristics
7.4.1 Inverse time overcurrent protection relay
7.4.2 Determination of earth fault direction
(MRI(K)3-ER/XR)
7.5 Tripping characteristics
7.6 Output relays
8 Order form

4TB MRI(K)3-C 03.02 E
1 Introduction and Application
The digital net protection relay MRI(K)3-C an universal
time - over -current and earth fault relay with integrated
control- and supervision function as well as optional an
integrated auto reclosing function The earth fault pro-
tection is applicable for insulated and compensated
grids. The controlling of the circuit breaker take place
by the means of the front plate via push button in the
case of a local operation, the remote operation can
be done via digital inputs or via the serial communica-
tion interface.
The earth-fault supervision is either realised in Holm-
green connection or by means of a core-type current
transformer.
The MRI(K)3-C is available with rated currents of 1 A
or 5 A.
2 Characteristics and Features
•Microprocessor technology with self-supvervision,
•Measuring of phase currents as RMS value,
•Digital filtering of the earth current with discrete Fou-
rier analysis, by which the influence of interference
signals, such as harmonics and transient DC com-
ponents during an earth-fault are suppressed.
•Two sets of parameters,
•Operation cycle counter,
•Switch off power Measuring of the switch off power
of the CB power,
•Suppression of an LED indication after activation
(LED flash),
•Selectable protective functions : Definite time over-
current protection (DMT) and inverse time overcurrent
protection (IMT),
•Selectable 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,
•Definite element for short-circuit high-speed trip
•Defined time overcurrent protection without direc-
tional feature (DEFT)
•Inverse time overcurrent protection without directional
feature (INV)
•Two element defined- or inverse time earth fault pro-
tection,
•Optionally with integrated directional feature for the
earth fault element.
•Control of the CB via potential free auxiliary relays,
•Supervision of the CB via digital wide range inputs,
•Remote indication of the CB position via serial inter-
face.,
•CB failure protection,
•Display of the measuring values as primary quanti-
ties,
•Measuring of the phase currents during short-circuit
free operation,
•Blocking of the individual protective elements or the
trip elements can be set freely,
•The protective functions can be freely allocated to
the output relays. (RelayMatrix),
•automatic auto reclosing (optional),
•free assignment of protective function for every re-
closing separately adjustable,
•Free assignment of the input function to the digtial
input,
•Saving of trip values and the switch-off times (tCBFP) of
25 fault events (voltage fail-safe),
•Recording of up to 8 fault events with time stamp,
•Display of date and time,
•Trip via digital inputs,
•Rack mounting, with self-acting short-circuit mecha-
nism for CT circuits,
•Possibility of serial data exchange via the RS485 in-
terface, optionally with SEG RS485 Pro-Open-Data
Protocol or Modbus Protocol.

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

6TB MRI(K)3-C 03.02 E
P1
P2
S1
S2
P1
P2
S1
S2
P1
P2
S1
S2
I1
I2
I3
IE
L1.1
B3
B4 L1.2
L2.1
B5
L2.2
B6
L3.1
B7
L3.2B8
B1
B2
L
1
L2
L3
Figure 3.3: Measuring of phase currents 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.
Figure 3.4: Measuring of earth current with core-type CT (IE)
With the combination of phase and earth current
measuring, CTs to be connected according to Figure
3.3 or Figure 3.4.

TB MRI(K)3-C 03.02 E 7
3.1.1 Analog input circuits
The analog input signals of the phase currents IL1 (B3 -
B4), IL2 (B5 - B6), IL3 (B7 - B8) and the earth current IE
(B1 - B2) are fed to the protection device via separate
input CTs. The current measuring quantities are gal-
vanical decoupled, analogously filtered, and then fed
to the analog/digital converter.
For the unit type with earth fault directional features
(ER/XR-relay type) the residual voltage from the open
delta winding can directly be connected to A3 and
A2.
See chapter ??? for voltage transformer connections
on isolated/compensated systems (direction feature of
the aerth fault element)
3.1.2 Output relays
The MRI(K)3-C has 5 output relays. Two of these re-
lays with two change-over contacts and three relays
with one change-over contact each are used for sig-
nalling. The protective functions can be freely allo-
cated except of those for the self-supervision 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-
ple with the exception of the self-supervision relay,
which operates acc. to the n. c. principle.
3.1.3 Digital inputs
The MRI(K)3-C has 7 digital inputs with fixed func-
tions. The input functions can be selected free for each
digital input. All inputs have a common reference point
: Terminal D8. (See chapter 5.11.4/5.11.5)
Terminal Function Code
jumper
C8 Digital Input 1 2
E8 Digital Input 2 1
A2 Digital Input 3 3
A5 Digital Input 4 4
A6 Digital Input 5 7
A7 Digital Input 6 6
A8 Digital Input 7 5
3.1.4 Low/High range of the digital
Inputs
The MRI(K)3-C is equipped with a wide-range power
supply unit and hence the supply voltage is freely se-
lectable. The switching threshold of the digital inputs,
however, has to be fixed in compliance with the sup-
ply voltage. Two different switching thresholds can be
adjusted:
Range Plug UAB UAN
Low Plugged in <= 8V >= 10V
High Open <= 60V >= 70V
Figure 3.5: Code jumpers

8TB MRI(K)3-C 03.02 E
3.2 Password
3.2.1 Code jumpers
Behind the front plate of the MR-relays there are three
code jumpers to preset the following functions:
•Password programming
•Output relay functions
The following figure shows the position and designa-
tion of the code jumpers:
Figure 3.6: Code jumpers
3.2.2 Password programming
The two different Password are assign to seperate
password sections. Password 1 ( Code jumper 1 )
With this password all protection parameter are
changeable. Password 2 ( Code jumper J2 ) With this
password it is allowed to change the mode of the re-
lay from “remote control” to “local control” and also al-
lowed to control the CB. (See Chap. 4.7.8) The pro-
cedure for password programming is described in
Chapter 4.4 of the description MR - general.
3.2.3 Function of the output relays
The following functions of MR output relays can be
preset:
•Reset of the output relays manually or automati-
cally
The alarm relays 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 ON:
All output relays remains activated and must be reset
after fault clearence.
•Manually: By pressing push button
<SELECT/RESET>
•External: By connecting aux. voltage to C8/D8
Via RS 485 interface (see chapter 5.11.4)
To let the parameter change take effect, the auxiliary
voltage has to be switched on and off again after the
code jumpers are plugged or unplugged.
* This functions is only aviable with relays without AR
function ( Type MRI3-C)
Code jumper Function Code jumper
position
Operation mode
J1 Password 1** OFF Normal position
general ON Password selection (see general description MR chapter
4.4)
J2 Password 2** OFF Normal position
Control-level ON Password selection (see general description MR chapter
4.4)
J3* Reset OFF Output relays will be reset automatically
ON Output relays will be reset manual/external/via soft-
ware
Table 3.1: Summary of coding possibilities
** are both code jumpers set, it is not possible to change the password.

TB MRI(K)3-C 03.02 E 9
3.3 Front plates
Figure 3.7: Front plate MRI(K)3-ICE
Figure 3.8: Front plate MRI3-ICE
The LEDs No, RS and on the MRI(K)3-C emit a yellow
light, all other LEDs are bi-coloured. The LEDs at the left
next to the alphanumerical display give a green light
during measuring and a red one when a fault signal
occurs.
The LEDs underneath the <SELECT/RESET> - push but-
ton emit a green light during adjustment and inquiry of
the setting quantities left to the LEDs. They show a red
light if the printed setting quantities right to the LEDs
are activated.
3.3.1 Indicating LEDs
L1, L2, L3 Indication of the phase currents
E Indication of the earth current
I2t Indication for the composite switch
off power of the CB.
No operation cycle counter
!Date and time
CB red 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 short-circuit
IE> Earth overcurrent setting
tIE> Tripping time for the earth overcurrent
IE>> Earth short circuit setting
tIE>> Tripping time for the earth short-circuit
CHAR Selection of characteristics
tRST Reset-Mode for the time delay of the
protection elements
t> emits in combination with all time
delay settings
DI Assignment of input functions to the
digital inputs.
Trip ext. tripping
Block Trip/Blockage time
Fast Fast/Time function
I²t> Pick up level for the composite switch
off power
SHOT number off AR shots
tF fault time
tD1 dead time before 1. AR
tD2 dead time before 2. AR
tD3 dead time before 3. AR
tD4 dead time before 4. AR
tCl close impuls time
tR reclaim time
FR Parameter for the fault recorder
RS Setting of the relay address
P2 Parameterset 2 ist active

10 TB MRI(K)3-C 03.02 E
3.4 Front plates (for ER/XR-relay types)
Figure 3.9: Front plate MRI(K)3-ICER
Figure 3.10: Front plate MRI3-ICER
The LEDs IP, IQ, RS and FR on the MRIK3-ICE and
MRI3-ICE emit a yellow light, all other LEDs are bi-
coloured. The LEDs at the left next to the alphanumeri-
cal display give a green light during measuring and a
red one when a fault signal occurs.
The LEDs underneath the <SELECT/RESET> - push but-
ton emit a green light during adjustment and inquiry of
the setting quantities left to the LEDs. They show a red
light if the printed setting quantities right to the LEDs
are activated.
3.4.1 Indicating LEDs
L1, L2, L3 Indication of the phase currents
E Indication of the earth current
IPIndication of the active component of
the earth fault current
IQIndication of the reactive component
of the earth fault current.
!Date and time
CB red CB ist switched on
CB green CB is switched off
CB blinking CB has faults
3.4.2 Adjusting LEDs
I> Overcurrent setting
I>> Short-circuit setting
IE> Earth overcurrent setting
IE>> Earth short circuit setting
CHAR Selection of characteristics
t> lights in combination with all time de-
lay settings.
DI Assignment of the input functions to
the digital inpus
Trip ext. tripping
Block Trip/Blockage-time
Fast Fast/Time function
SHOT Number of AR shots
tF max. fault time
tD1 dead time before 1. AR
tD2 dead time before 2. AR
tD3 dead time before 3. AR
tD4 dead time before 4. AR
tCl max close impuls time
tR reclaim time
FR Parameter for the fault recorder
RS Setting of the relay address
P2 Parameterset 2 ist active