M II Family Digital Differential Protection Relay

High Impedance
Bus Differential Protection

Features and Benefits Monitoring and Metering

Configurable Logic 24 Event record per M Family Unit
Flash memory for field upgrades Analog/digital oscillography
Two setting tables Per phase current metering
Drawout case User Interfaces
DC power supply
EnerVista software for setting
Applications & monitoring
High impedance differential protection RS232 port, faceplate accessible
(0.3-19.2kbps, ModBus®RTU)
Restricted Ground Fault protection with
one/two elements RS485 rear port (0.3-19.2 kbps, ModBus®
Lockout logic RTU)
LED dot matrix display and keypad
Target LED indicators

GE Multilin 1

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 MIB M II Family Digital Differential Protection Relay

Description Computer access allows setting detected by other protection

and configuration (inputs, functions.
The MIB, a member of the M outputs, LEDs and configurable
family of protection relays, is a logic) of the units, display of Configurable Logic
microprocessor based relay that metering information, and real
provides three phase high imped- Up to a maximum of 4 config-
time status of the unit. The
ance differential protection for urable logic schemes can be
display of event records and
Substation busbars of any volt- implemented into each MIB relay
oscillography report for the last
age level. Additionally, it can also by means of using a set of 4 pre-
fault is also included.
be used to protect electrical configured logic gates and timer
The MIB has a drawout construc- cells. A graphical user interface is
machines lik e transformer s,
tion in a 19’’ rack case and can be provided for configuration of the
generators or motors against
flush or 19” rack mounted. logic. The outputs of the config-
restricted earth faults.
urable logic can be used to
Basic protection functions
configure digital outputs and
features include a high imped-
ance differential protection unit.
PROTECTION LEDs.
Stability against external faults is
Differential Unit (87H) Multiple Setting Groups
guaranteed thanks to the use of
a n s t a b i l i z i n g r e s i s t o r. This unit detects internal faults Two separate settings groups are
Additionally, the unit includes a within the busbars. It is based on stored in non-volatile memory,
set of MOVs (Metal Oxide a very sensiti ve overcurrent with only one group active at a
Varistors) in order to clamp the differential unit that can be given time. Switching between
secondary peak voltage below adjusted between 10mA and setting groups 1 and 2 can be
2kV during fault conditions. 400mA. The MIB includes a 2000 done by means of a setting, a
Ohm set of stabilizing resistors to communication command or
For applications as restricted
make sure that the unit remains digital input activation.
earth fault protection (RGF) of
electrical machines, the differen- stable for pass-through faults. Settings are divided in 2 cate-
tial principle of operation is In order to protect the unit, a set gories, main and advanced
similar. The unit is intended to of MOVs clamps the secondary settings. This allows users to
provide sensitive ground fault voltage under faults to less than 2 have access to main relay func-
detection for low magnitude fault kV. Please note that all the CTs tionalities in an extremely simple,
currents. must have the same ratio. user friendly way by entering
only main settings, while having
Each MIB relay unit has two
Alarm Unit (87L) access to complete functionality
configurable digital inputs and
for more complex use through
six contact outputs (four of them The alarm unit detects any
advanced settings.
are configurable). Six LEDs are current unbalance condition, like
also provided, being four of them the ones produced when one of
user configurable. The front the CTs has a phase open. Once Inputs and Outputs
panel also features a three key the condition is detected a timer Two configurable inputs and six
keypad and a 3.5 digit LED dot starts that finally blocks the oper- contact outputs (four of them
matrix display that provides an ation of the MIB. configurable) are provided for
easy to use user interface. Settings go between 10mA and each MIB relay.
The front keypad allows the user 400mA. Timer is up to 600 sec in
to set the baud rate and relay steps of 10 ms. Metering
address for communication. A MIB provides metering values for
front RS232 and a rear RS485 Restricted Ground Fault phase differential current.
communication port are provided
Restricted Ground Fault (RGF)
for computer access using
protection is intended to provide
ModBus® RTU protocol. The rear
sensitive ground fault detection
RS485 can be converted to an
for low magnitude fault currents.
RS232 or fiber optic port (plastic
This protection is often applied to
or glass fiber optics) by means of
machines and transformer s
using an external converter (DAC
having impedance grounded Wye
30 0, F485). Windows® based
windings. It is intended to
ENERVISTA software is provided
provide sensitive ground fault
free of charge with the relay to
detection for low magnitude fault
allow setup and configuration of
currents which would not be
MIB units.

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 MIB M II Family Digital Differential Protection Relay

FUNCTIONAL BLOCK DIAGRAM

Metering
86 Oscillography
R
3 Event Recorder
Configurable I/O
and LEDs
87H 86
R 87H 87L Configurable Logic
1

87L

Metering
MIB
Oscillography Differential Protection Relay
Event Recorder Transformer Application
Configurable I/O
and LEDs
Configurable Logic EN MIB BLOCK E_TRANSFORMER ONE. Cdr

MIB
Differential Protection Relay

EN MIB BLOCKE_BUSBAR. Cdr

FEATURES urable outputs can be assigned Keypad and Display

either to a set of preconfigured A three button keypad allows
values, or an OR/NOT combina- user access for easy relay interro-
Event Recording
tion of the same values. gation and change of settings.
Events consist of a broad range
Each configurable output can be Metering data, last trip informa-
of change of state occurrences,
independently latched. tion and settings are displayed
including pickups, trips, contact
The first LED has a fixed assign- through the LED dot matrix
operations, alarms and self test
ment (relay in service), the display. Note that full access to
status. Each MIB relay stores up
second is fixed for trip, and the the event and oscillography
to 24 events time tagged to the
remaining four LEDs are user records, and unit configuration is
nearest millisecond. This provides
configurable in function, memory possible only through PC
the information needed to deter-
and/or blinking/fixed indication. communication.
mine sequence of events which
facilitates diagnosis of relay oper- Input, output and LED configuration is Self Test Diagnostics
ation. Each event can be performed using EnerVista software
individually maskable in order to Comprehensive self test diagnos-
avoid the generation of undesired tics occur at power up and
events. continuously during relay opera-
tion. Any problem found by self
Oscillography tests causes an alarm and an
event is logged.
Each MIB relay captures current
waveforms and digital channels
Communication Ports
at 8 samples per cycle. One oscil-
lography record with a maximum A front mounted RS232 and a
length of 24 cycles is stored in rear RS485 port allow easy user
memory. Oscillography is trig- interface via a PC. ModBus® RTU
gered either by internal signals or protocol is used for all ports. The
an external contact. USER INTERFACES relay supports baud rates from
300 to 19,200 bps. Up to 32 relays
Configurable I/O and LEDs Status LEDs can be addressed on a single
The status of the relay is indi- communications channel. A
There are two configurable digital
cated through six LEDs located unique address must be assigned
inputs in each MIB relay. Out of
on the front panel. The first one is to each relay via a setting when
the six digital outputs, two have a
green and has a fixed assignment multiple relays are connected.
fixed function (trip and service
required), while the other four are showing that the relay is in serv-
user configurable. Those config- ice. The other fi ve are user
configurable.

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 MIB M II Family Digital Differential Protection Relay

EnerVista Software It provides full access to the relay Lockout logic

A single PC software package is data with the following features:
6 outputs, four of them
required to access, confi gure, View actual values configurable
and monitor all relays in the View relay status Two setting tables
M family regardless of their
model, application, or available View/edit settings on-line/off-
line Transformer Application
options. EnerVista extracts the
model number, ver sion, and View event recorder for High impedance restricted earth
configuration parameters from troubleshooting fault protection, control and
the connected relay to display metering shall be provided in one
Configure inputs, outputs integrated digital package. The
only the relevant data and
and LEDs through device shall be suitable for incor-
options for the relay it is commu-
configurable logic poration in an integrated
nicating with. This eliminates
having to manually configure the Utilize a configurable substation control system.
relay within the software and protection curve Protection and control functions
provides an simple and easy to Relay firmware programming shall include:
use operator user interface. for upgrades Restricted earth fault
All M Family products are Allow multi language differential protection
supplied with Windows® based selection of the menus 2 lockout contacts with
EnerVista software. EnerVista (English, Spanish, French,
allows communication among M pushbutton
German, Italian, Turkish, etc.)
Family relays for monitoring, Two setting tables
setting changes, information and All status information such as
configuration. target messages and digital Monitoring
input/output states may be
Keep track of and react to all relay status data Monitoring features shall include:
viewed with EnerVista software.
with ease.
24 event record
Busbar Application Oscillography
High impedance differential Differential current metering
busbar protection, monitoring per phase
and metering shall be provided in
one integrated digital package for
application on any voltage
substation. The device shall be
suitable for incorporation in an
integrated substation control
system.
EnerVista may be run on a PC Protection and control functions
with the Windows® systems. The shall include:
program may be used locally on Differential protection (87H)
the RS232 front port or remotely
on the RS485 port. CT opening alarm (87L)

Dimensions
FRONT VIEW TOP VIEW PANEL MOUNTING

435 464.8
484 4 HOLES 7
30.5

FOR MOUNTING
38.25
185.4
101.5

101.5
176

178
260.3
200.5

38.25
29.3

12
440.8
12

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 MIB M II Family Digital Differential Protection Relay

Typical Wiring

CAUTION: FORK OR RING TERMINALS MUST

BE USED ON THE TERMINAL BLOCK
WARNING:
NOTES: SUITABLE DISCONNECT DEVICES GROUND PC TO RELAY GROUND.
RECOMMENDED LOCATED NEAR THE RELAY OTHERWISE USE UNGROUNDED PC

OVERVOLTAGE CATEGORY: II

RETURN
F6
86/C
B5 B6

MOV
DIFF PHASE C
E12 RR E6
E12
E5
86/B
B1 B2

MOV
DIFF PHASE B
E11 RR E4
E11
E3
86/A
A9 A10

MOV
DIFF PHASE A
E10 RR E2
E10
E1
3 4 5 6
GND F1 F2 F3 F4 F5 F6 SDA SDB COM

IA N IB N IC N RS 485
RS232
GROUND BUS G12 H12 G11

CURRENT INPUTS

GE Multilin
READY

G5 C10
MIH Module
G6 MIB RESET
C9
BUSBAR
PROTECTION RELAY

86 Relay
TRIP ALARM
RESET RESET TRIP
Cc2 COM COM
86 86 86

H8 H9 H10 H1 H2 H5 H6 G7 G8 G9 G10 H7 A1 A4 B9 B12

DC
(+)
POWER
SUPPLY (-)
B7 B8

NOTE: 14 AWG
TRIP

WIRING RECOMMENDED

EN MIB CON_226B5114F1R1.ai

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 MIB M II Family Digital Differential Protection Relay

MIB Technical Specifications

HIGH IMPEDANCE METERING ENVIRONMENTAL
DIFFERENTIAL UNIT (87) Current Circuits: Temperature:
Pickup Level: 10mA to 400mA Continuously: 4A Storage: -40ºC to +80ºC
Definite Time: Up to 600 sec (10 msec steps) During 3 Sec: 50A Operation: -25ºC to +70ºC
Accuracy: During 1 Sec: 100A
Level: ±3% in the complete range Humidity: Up to 95% without condensing
Time: Greater of ±3% or ±25 ms

ALARM UNIT (87AL) COMMUNICATIONS

PACKAGING
Pickup Level: 10mA to 400mA Local Communication: Alphanumeric display;
Definite Time: Up to 600 sec (10 msec steps) Approximate Weight:
3 button frontal keypad
Accuracy: Net: 23.59 lb (10.7 kg)
Remote Communication:
Level: ±3% in the complete range Ship: 25 lb (11.3 kg)
(local or remote PC and communications net):
Time: Greater of ±3% or ±25 ms Mode: ModBus® RTU
Baudrate: 300 to 19200 bps
TYPE TESTS
INPUTS DB9 connector for RS232 ports on the front (1) and RS485 on the rear Isolation Test Voltage: 2kV, 50/60 Hz, 1 min IEC 60255-5
Surge Test Voltage: 5 kV peak, 0.5 J IEC 60255-5
BURDENS Interference: Class III according to IEC60255-22-1
Current Circuits: <0.08 VA at In (1A) Electrostatic Discharge:
DC Burden: POWER SUPPLY Class IV according to IEC60255-22-2
During Operation: 5 W standby Radiointerference: Class III according to IEC60255-22-3
Per Each Activated Input: 8 mA / 1 W, Vaux:125 Frequency: 50/60 Hz
Auxiliary Voltage: 24-48 VDC ±20% Fast Transient: Class IV according to IEC60255-22-4
110-250 VDC ±20% Sinusoidal Vibration: Class I according to IEC60255-21-1
Shock: Class I according to IEC60255-21-2
OUTPUTS Radiofrequency Emission:
According to IEC41B (Sec 81)
TRIPPING CONTACTS
and EN55022 Class B
Contact Capacity: RESISTOR Oscillatory / Fast Risetime Transient:
Max. Operating Voltage: 400 Vac Value: 2000 Ohm ANSI/IEEE C 37.90.1
Continuous Current: 16 A Max. Operating Cont. Voltage 300 V Electromagnetic Interference Withstand Capability:
Make and Carry: 30 A
MOVs ANSI/IEEE C 37.90.2
Breaking: 4000 VA
V Peak: 1900 V
OUTPUT RELAYS Max. Withstand Energy: 5400 J
Configuration: 6 Electro-Mechanical Form C APPROVALS
Contact Material: Alloy suited for inductive loads CSA: Approved under LR 41286
Operate Time: 8 ms Conforms to EN/IEC 60255
Inductive load: 0.3 A at 125 Vdc
ISO: Manufactured to an ISO9001 registered program

*Specifications subject to change without notice.

Ordering
To order select the basic model and the desired features from the Selection Guide below:

MIB High Impedance Differential Protection Relay

MIB * 0 * * C E 000 00
Application
1 1 winding Transf. REF App. 1 High Imp. Differential Element
2 2 winding Transf. REF App. 2 High Imp. Differential Elements
3 Busbar App. 3 High Imp. Differential Elements
Auxiliary Voltage
L O LO Power Supply: 24-28 Vdc (range: 19~58Vdc)
H I HI Power Supply: 110-250Vdc (range: 88~300Vdc)

rev0726

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