Cooper Low Impedance Bus Differential Relay M-LIB3 Manual de usuario
Protective Relays SALES AID
M-LIB3 Low Impedance Bus Differential Relay S150-34-1
October 1999 1999 Cooper Industries, Inc. • New Issue. 1
MODULAR LOW IMPEDANCE
BUS PROTECTION
TYPE
M-LIB3
OPERATION MANUAL
M-LIB3 Low Impedance Bus Differential Relay
2
INDEX
1 General utilization and commissioning directions_______________________________________________________ 3
1.1 Storage and transportation______________________________________________________________________ 3
1.2 Installation___________________________________________________________________________________ 3
1.3 Electrical connection___________________________________________________________________________ 3
1.4 Measuring inputs and power supply_______________________________________________________________ 3
1.5 Outputs loading_______________________________________________________________________________ 3
1.6 Protection earthing_____________________________________________________________________________ 3
1.7 Setting and calibration__________________________________________________________________________ 3
1.8 Safety protection______________________________________________________________________________ 3
1.9 Handling____________________________________________________________________________________ 3
1.10 Maintenance_________________________________________________________________________________ 4
1.11 Fault detection and repair_______________________________________________________________________ 4
2 General characteristics and operation________________________________________________________________ 5
2.1 Modular Low Impedance Bus Bar Protection M-LIB3__________________________________________________ 5
2.2 Main features_________________________________________________________________________________ 5
2.3 Component Modules___________________________________________________________________________ 5
2.3.1 M-BF3 = Income/Feeder Breaker input module (SCE1577)________________________________________ 5
2.3.2 M-BC3 = Bus coupler / sectionalizer module (SCE1578)__________________________________________ 6
2.3.3 M-LID3 =Numerical biased protection relay____________________________________________________ 6
2.4 F/C Rack Panel_______________________________________________________________________________ 7
2.5 Accessoeries_________________________________________________________________________________ 8
2.5.1 CF1- Cable with female plug________________________________________________________________ 8
2.5.2 CFM – Interconnection cable with Male an Female plugs__________________________________________ 9
2.6 Technical Data________________________________________________________________________________ 10
2.7 Current Transformer Requirements________________________________________________________________ 10
3 Apparatus Configuration____________________________________________________________________________ 11
3.1 Single-Line Diagram____________________________________________________________________________12
3.2 Application example____________________________________________________________________________13
4 Feeder Input Module M-BF3__________________________________________________________________________ 15
4.1 Wiring diagram M-BF3__________________________________________________________________________ 17
5 Feeder Input Module M-BC3__________________________________________________________________________18
5.1 Wiring diagram M-BC3__________________________________________________________________________20
6 Digital Low Impedance Differential Protection Relay M-LID3_______________________________________________ 21
6.1 General Characteristic__________________________________________________________________________ 22
6.2 Power Supply_________________________________________________________________________________ 22
6.3 Measurements Acquisition and Operation Principle____________________________________________________22
6.4 Operation of the Biased Differential elements________________________________________________________ 23
6.5 Control and Measurements______________________________________________________________________ 25
6.6 Measurements Acquisition and Operation Principle___________________________________________________ 26
6.7 Output relays_________________________________________________________________________________ 27
6.8 Serial Communication__________________________________________________________________________ 27
6.9 Oscillography Records__________________________________________________________________________ 27
6.10 Digital Input__________________________________________________________________________________ 27
6.11 Test________________________________________________________________________________________ 28
6.12 Keyboard and Display Operation__________________________________________________________________ 28
6.13 Reading of Measurements and Recorded Parameters_________________________________________________29
6.13.1 Actual Measurements (ACT. MEAS)__________________________________________________________ 29
6.13.2 Max Value (MAX.VAL)_____________________________________________________________________ 29
6.13.3 Last Trip (LASTTRIP)______________________________________________________________________ 29
6.13.4 Trip Number (TRIP NUM)___________________________________________________________________29
6.14 Reading of Programmed Setting and Relay’s Configuration_____________________________________________ 30
6.15 Programming_________________________________________________________________________________ 30
6.15.1 Programming of functions settings____________________________________________________________ 30
6.15.2 Programming the configuration of output relays__________________________________________________31
6.16 Manual and Automatic Test Operation______________________________________________________________32
6.16.1 Mode “TESTPROG ” subprogram “W/O TRIP ”__________________________________________________ 32
6.16.2 Mode “TESTPROG ” subprogram “WithTRIP ”___________________________________________________32
6.17 Maintenence__________________________________________________________________________________32
6.18 Clock and Calendar____________________________________________________________________________ 33
6.18.1 Clock synchronization______________________________________________________________________33
6.18.2 Date and time setting______________________________________________________________________ 33
6.18.3 Time resolution___________________________________________________________________________ 33
6.18.4 Operation during power off__________________________________________________________________ 33
6.18.5 Time tolerance___________________________________________________________________________ 33
6.19 Wiring Diagram M-LID3_________________________________________________________________________ 34
6.20 Electrical Characteristics________________________________________________________________________ 35
S150-34-1
3
GENERAL UTILIZATION AND COMMISSIONING DIRECTIONS
Always make reference to the specific description of the product and to the
Manufacturer's instructions.
Carefully observe the following warnings.
1.1 STORAGE AND TRANSPORTATION
Must comply with the environmental conditions stated on the product's instruction or by the applicable
IEC standards.
1.2 INSTALLATION,
Must be properly made and in compliance with the operational ambient conditions stated by the
Manufacturer.
1.3 ELECTRICAL CONNECTION,
Must be made strictly according to the wiring diagram supplied with the Product, to its electrical
characteristics and in compliance with the applicable standards particularly with reference to human
safety.
1.4 MEASURING INPUTS AND POWER SUPPLY,
Carefully check that the value of input quantities and power supply voltage are proper and within the
permissible variation limits.
1.5 OUTPUTS LOADING,
Must be compatible with their declared performance.
1.6 PROTECTION EARTHING
When grounding is required, carefully check its efficiency.
1.7 SETTING AND CALIBRATION
Carefully check the proper setting of the different functions according to the configuration of the
protected system, the safety regulations and the co-ordination with other equipment.
1.8 SAFETY PROTECTION
Carefully check that all safety means are correctly mounted, apply proper seals where
required and periodically check their integrity.
1.9 HANDLING
The electronic components and semiconductor devices mounted on the modules can be seriously
damaged by electrostatic voltage discharge which can be experienced when handling the modules.
The damage caused by electrostatic discharge may not be immediately apparent but the design
reliability and the long life of the product will have been reduced. The electronic are completely safe
from electrostatic discharge (8 KV IEC 255.22.2) when housed in their case; withdrawing the modules
without proper cautions expose them to the risk of damage.
M-LIB3 Low Impedance Bus Differential Relay
4
a. Before removing a module, ensure that you are at the same electrostatic potential as the
equipment by touching the case.
b. Handle the module by its front-plate, frame, or edges of the printed circuit board. Avoid
touching the electronic components, printed circuit tracks or connectors.
c. Do not pass the module to any person without first ensuring that you are both at the
same electrostatic potential. Shaking hands achieves equipotential.
d. Place the module on an anti-static surface, or on a conducting surface which is at the
same potential as yourself.
e. Store or transport the module in a conductive bag.
More information on safe working procedures for all electronic equipment can be found in
BS5783 and IEC 147-OF.
1.10 MAINTENANCE
Make reference to the instruction manual of the Manufacturer ;
maintenance must be carried-out by specially trained people and in strict conformity with
the safety regulations.
1.11 FAULT DETECTION AND REPAIR
Internal calibrations and components should not be altered or replaced.
For repair please ask the Manufacturer or its authorized Dealers.
Misapplication of the above warnings and instruction relieves the Manufacturer of any liability.
S150-34-1
5
GENERAL CHARACTERISTICS AND OPERATION
1.12 Modular Low Impedance Bus Bar Protection M-LIB3
The M-LIB system is constituted of a number of modular units, which can be combined to suit to any
busbar configuration and allow for easy extension.
1.13 Main features
qLow impedance and low burden on main CTS.
qHigh stability with zone biased differential elements and CT saturation detectors.
qHigh speed of operation.
qHigh reliability: duplicated measuring circuits, CTs’ secondary circuits supervision, wide and
consistent setting ranges
qSelf-contained input CTs for main zone and for check zone feature without duplication of main CTs.
qSelf-contained isolator repeat relays switching at secondary of the zone input CTs.
qSelf-contained discrepancy alarm relays
qMultivoltage power supply.
qComprehensive self-diagnostic.
qUser friendly MMI.
qReal time and recorded measurements.
qEvent records and oscillography
qRS 485 serial port with ModBus protocol.
1.14 Component Modules
The system includes three basic modules:
1.14.1 M-BF3 = Income/Feeder Breaker input module (SCE1577)
Including :
qsets of three CTs. 1 set for the Main Zone and 1 for the Check Zone.
qCT saturation detectors.
qbistable isolator repeat relays for switching the secondary circuits of the input CTs and the zone
trip input signal.
qTime delayed isolator discrepancy alarm feature
qPower supply unit
M-LIB3 Low Impedance Bus Differential Relay
6
1.14.2 M-BC3 = Bus coupler / sectionalizer module (SCE1578)
Including :
qsets of three auxiliary CTs : 1 set for each side of the bus coupler.
q1 Bus coupler trip output.
q1 Bus Coupler trip input from Feeders’ Breaker Failure Relays
1.14.3 M-LID3 = Numerical biased protection relay
With the following features :
qDouble circuit for Biased differential protection.
qDouble circuit for unbiased differential protection.
qDouble circuit for CT circuits supervision.
qOutput relays for phase trip
q1 Supervision alarm relay
q1 Internal fault alarm relay
q1 Lock-out digital input
q1 Remote trigger input
qSynchronization digital input
qRS 485 communication Port
qTimed supervision alarm
qTimed discrepancy alarm
S150-34-1
7
2.4 F/C Rack Panel
19” 3U rack panel suitable to house up to seven plug-in modules type M-BF3 or M-BC3 including
back printed circuit board with :
qDiodes for supply of the measurement bus of two Main Zones and one Check Zone
q7 Female sockets for plug-in connection of the M-BF3 or M-BC3 modules.
q7 Terminal boards with screw terminals for connection to the system.
q1 Male connector socket for interfacing with the differential protection relays.
q1 Female connector socket for interconnection with other F/C Rack Panels.
q1 Power supply module:
The auxiliary power is supplied by a built-in interchangeable module fully isolated and self
protected. Two options are available :
24V(-20%) / 110V(+15%) a.c. 80V(-20%) / 220V(+15%) a.c.
a) -b) -
24V(-20%) / 125V(+20%) d.c. 90V(-20%) / 250V(+20%) d.c.
Before energizing the unit check that supply voltage is within the allowed limits.
Power consumption : nx 4W (n = number of modules M-BF3)
The unit can supply up to 12 modules M-BF3 plus two modules M-BC3 (one unit can supply two F/C Rack
Panels).
M-LIB3 Low Impedance Bus Differential Relay
8
2.5 ACCESSORIES
2.5.1 CF1 – Cable with female plug
Female connector plug with multicore cable for connection between the
terminals of the protection relays and the Zone wiring bus.
S150-34-1
9
2.5.2 CFM – Interconnection cable with Male and Female plugs
Multicore cable terminated with one male and one female connector plugs for
interconnection between F/C Rack Panels.
M-LIB3 Low Impedance Bus Differential Relay
10
2.6 Technical Data
qStandards: IEC 255, 1000, CE
qRated Frequency: 50/60 Hz
qRated input current: 1 A
qCurrent overload: 2 In
qTransient overload: 100 In
qSetting ranges: •Fn= 50/60 Hz
•Ids = zone differential current = (0,2-2) In
•R = Bias per Unit = (0,4 - 1) p.u.
•ISV = Circuit supervision current = (0,1 – 1) In
•Operating time: ≤20 ms
•Stability level: ≥40 Inmax.
2.7 CURRENT TRANSFORMER REQUIREMENTS
Current transformer requirements
Minimum knee point voltage: VK ≥F . In . RTwhere
F = Accuracy limit factor (20 recommended)
In = Main CT’s rated secondary current
RT= Total CT’s secondary loop resistance (see equivalent diagram)
Minimum power: 2
InR
InF
V
SCT
K
−
⋅
≥
RCT = Secondary resistance of main CT
RW = Resistance of connection lead
RP = Primary resistance of auxiliary ratio matching CT
n = IP/IS = Current ratio of auxiliary CT
RS = Secondary resistance of auxiliary ratio matching CT
Rd = Ohmic burden of M-LIB3 : 0.52Ω(In=1A)
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