GE MLP1000 User manual

GGEEKK--9884698846AA
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GE Power Management
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MLP
MLP
MICROPROCESSOR BASED
DISTANCE PROTECTION
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TABLE OF CONTENTS
1. DESCRIPTION......................................................................................................... 3
2. APPLICATION ......................................................................................................... 6
3. CHARACTERISTICS................................................................................................ 7
3.1 GENERAL CHARACTERISTICS............................................................................7
3.2. TECHNICAL SPECIFICATIONS............................................................................ 8
3.3 SETTINGS RANGES AND VALUES.................................................................... 11
3.4 INTERRELATIONS BETWEEN SETTINGS......................................................... 18
4. PRINCIPLES OF OPERATION.............................................................................. 19
4.1 INPUTS................................................................................................................ 19
4.2 CURRENT AND VOLTAGE MEASURING ........................................................... 20
4.3 DISTANCE MEASURING UNITS (DMU).............................................................. 21
4.4 PROTECTION SCHEMES.................................................................................... 23
4.5 LINE PICK UP UNIT (LPU)................................................................................... 25
4.6 REMOTE OPEN DETECTOR UNIT (ROD) (MLP3000)........................................ 26
4.7. DISTURBANCE DETECTION UNIT (DD) (MLP3000) ......................................... 26
4.8 FUSE FAILURE UNIT (FF) (MLP3000)................................................................. 27
4.9 RECLOSER (MLP2000 AND MLP3000) ................................................................ 27
4. 10. DIRECTION INDICATOR ................................................................................. 30
4.11 MLP STATUS..................................................................................................... 30
4.12 EVENT REGISTER ............................................................................................ 32
4.13 OSCILLOGRAPHIC REGISTER......................................................................... 33
4.14 FAULT LOCATOR (MLP3000). .......................................................................... 35
4.15 CURRENTS OR VOLTAGE LOG....................................................................... 35
4.16 BREAKER SUPERVISION. ................................................................................ 36
4.17 SELF CHECKS AND ERROR ROUTINES. ........................................................ 37
4.18 OUTPUTS .......................................................................................................... 40
4.19 OPERATIONS.................................................................................................... 42
4.20. OUT OF STEP BLOCKING UNIT...................................................................... 42
5 COMMUNICATIONS............................................................................................... 43
5.1 REMOTE COMMUNICATIONS............................................................................ 43
5.2 SELF CHECKS AND ERROR ROUTINES ........................................................... 43
5.3 RELAY DATA....................................................................................................... 45
5.3.1 EVENT REGISTER........................................................................................ 45
5.3 2 CURRENTS AND VOLTAGE LOGS............................................................... 46
5.3.3 MLP STATUS................................................................................................. 46
5.4 LOCAL COMMUNICATIONS................................................................................ 46
5.4.1 KEYBOARD AND DISPLAY........................................................................... 46
5.4.2 INFORMATION GROUP ................................................................................ 49
5.4.3 EVENT LOGS ................................................................................................ 50
5.4.4 CURRENT OR VOLTAGE LOGS................................................................... 51
5.4.5. STATUS........................................................................................................ 52
5.4.6 OPERATIONS GROUP.................................................................................. 53
5.4.7 VIEW SETTINGS ........................................................................................... 54
5.4.8 MODIFY SETTINGS....................................................................................... 55
5.4.9 SETTINGS NOT ACCESSIBLE FROM THE KEYBOARD.............................. 57

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5.4.10 SINGLE KEY OPERATIONS........................................................................ 58
5.4.11 CONFIGURATION UNIT.............................................................................. 58
5.4.12. INTERACTION OF THE KEYBOARD WITH REMOTE COMMUNICATIONS61
6. ACCEPTANCE TESTS........................................................................................... 62
6.1 FUNCTIONAL TESTS.......................................................................................... 62
6.2 ACCEPTANCE TESTS......................................................................................... 62
6.2.1 INITIAL CONFIGURATION ............................................................................ 62
6.2.2 INPUT CONTACT .......................................................................................... 65
6.2.3. RELAY MEASUREMENT.............................................................................. 67
6.2.4 SINGLE PHASE MEASUREMENT UNIT'S REACH FOR THE MHO
CHARACTERISTIC................................................................................................. 67
6.2.5 SINGLE PHASE MEASUREMENT UNIT'S REACH FOR THE MINIMUM
REACTANCE CHARACTERISTIC .......................................................................... 71
6.2.6 TWO PHASE MEASUREMENT UNIT'S REACH FOR THE MHO
CHARACTERISTIC................................................................................................. 74
6 2 7 NON-CONFIGURABLE OUTPUT CONTACTS.............................................. 77
6.2.8 PHASE SELECTORS, FAULT LOCATOR (MLP3000), AND THE ZONE. TIMERS.
................................................................................................................................78
6.2.9 ZONE 1 EXTENSION SCHEME..................................................................... 80
6.2.10 ZONE 2 ACCELERATION SCHEME (MLP3000) ......................................... 80
6.2.11. LPU FUNCTION.......................................................................................... 81
6.2.12. ROD FUNCTION (MLP3000)....................................................................... 81
6.2.13 DD FUNCTION (MLP3000) .......................................................................... 82
6.2.14 FF FUNCTION (MLP3000)........................................................................... 82
6.2.15 TRIP BLOCKS (Settings and Input).............................................................. 82
6. 2.16 DIRECTION INDICATORS......................................................................... 83
6.2. 17 OPERATIONS............................................................................................. 83
6.2.18 BREAKER SUPERVISION........................................................................... 83
6.2.19 RECLOSER (MLP2000 and MLP3000)........................................................ 84
6.2.20 CONFIGURABLE OUTPUTS ....................................................................... 85
6.2.21 EVENT REGISTER ...................................................................................... 85
6.2.22 OUT OF STEP BLOCKING.......................................................................... 86
7. PERIODIC TESTS AND MAINTENANCE............................................................... 87
7.1 DESCRIPTION..................................................................................................... 87
7.2 TESTS PERFORMED WITH THE XTM COMBS.................................................. 87
7.3 THE TEST BLOCK DENOMINATION................................................................... 87
7 4 CONNECTION OF THE TEST COMBS. .............................................................. 88
7.5. INSERTING THE TEST COMBS......................................................................... 88
7.6 STANDBY VOLTAGE DISCONNECTION............................................................ 88
7.7 EQUIPMENT TESTING PROCEDURES AND CONNECTION AFTER THE
EQUIPMENT IS INSTALLED...................................................................................... 89
8. RECEPTION, HANDLING, AND STORAGE .......................................................... 89
9. FIGURE LIST......................................................................................................... 91

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1. DESCRIPTION
The MLP system is a digital multiprocessor which provides three phase trip distance
protection and automatic reclosing as analysis and control functions. It is designed for the
protection, control, and monitoring of lines and cables with voltage levels up to 132 kV and
distances up to 150 km. Its application is adequate in systems where the directional
overcurrent protection may not be sufficient and the trip time (1.5 cycles) is acceptable.
Each MLP system is linked to a distribution line and acts as a distance protection
and independent reclosing system.
The MLP system includes a serial communications module that allows its use as an
integrated component of a complete protection and control system of substations or higher
levels (see diagram 1). Other system components are:
a) Remote controller PC compatible computer via modem.
b) Communications concentrator unit broadcasting device (FAC for fiber optics) and
modem for connection to MLP and/or MOR, MTP y MCP systems linked to the
substation distribution lines.
The information provided herein does not intend to cover all details of
variations of the described equipment nor does it take into account the
circumstances that be present in your installation, operating or maintenance
activities.
Should you wish to receive additional information, or for any particular
problem which cannot be solved by referring to the information contained herein,
please write to:
GENERAL ELECTRIC POWER MANAGEMENT, S.A.
The MLP system includes the following operations
− Three directional distance protection zones for faults between phases and
phase-ground faults.
− The measuring unit characteristic can be selected between negative sequence
reactance and variable MHO for phase-ground fault detection inside zone 1, or
extended zone 1 and zone 2. (All models)
− Measuring units with variable MHO characteristic, for ground-phase fault
detection inside zone 3.
− Measuring units with variable MHO characteristic, for phase-phase fault
detection inside zone 1 or extended zone 1, zone 2 and zone 3.
− Three protection schemes:

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Scaled range.
Zone 1 extension.
Zone 2 acceleration. (MLP3000 only)
− The last two schemes cannot be selected simultaneously. The scaled range
scheme will stay active even when any of the other two diagrams has been
selected. The last scheme requires an existing communications channel
between the protections on both sides of the line.
− Out of step blocking function.
− Line power function.
− 3 phase top in all zones.
− Event register which includes built-in calendar and clock, capable of storing up to
240 events. The data stored includes date, time, current and voltage values,
status of any of the 12 distance measuring units that are activated, and type of
event. Examples of events are: start of any measuring unit, trip and reclosing
orders, opening or closing of the breaker, etc. In the event of power loss, the
events will not be lost.
− Measuring and monitoring of the current and voltage of the three phases and the
current of the zero sequence unit.
− On-line monitoring of the breaker status, distance protection and recloser:
− Hourly register of the maximum load current or power (selectable), capable of
storing information accumulated over seven days.
− A phase direction indicator that indicates if the line current is in the trip direction
or m the opposite direction.
− Serial communications module for local or remote data retrieval, breaker control
and relay programming, as well as distance protection settings, recloser settings
and system parameters. It also includes a keyboard and display for local
communications. The different MLP models include one of the following
standard interfaces:
Plastic fiber optic interface
Crystal fiber optics interface
RS232C.
− Remote control of the breaker.
− Self-checks and monitoring of the internal circuitry and external inputs.
− Automatic recloser of up to three programmable recloses. (MLP2000 and
MLP3000)

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− Fuse failure detector in voltage measuring circuits.
− Remote open detector (without communications channel). (MLP3000)
− Fault selector
− Fault locator (MLP 3000).
− Oscillographic register that retrieves seven fault situations, which are stored for
at least two hours in the event of a power loss. (MLP4000)
The oscillographic register retrieves data such as the waves of the three currents
and voltages, status of the inputs and outputs, distance protection signals, reclosing
signals and blocking signals. The register capacity is 30 cycles: two prefault cycles and 28
postfault cycles. The information generated by the fault selector (type of fault and it's
location) and the type of trip performed will be stored. Data can be retrieved and saved in
an ASCII file.
The MLP system protection and resetting operations are independent from control
and communications operations so that a highly reliable protection operation can be
ensured even in the case the rest of the components failed.
The MLP is stored in a unique assembling case 19". Dimensions are provided in
figure 2.
It also includes an internal clock (without battery) with hundredths of a second
precision. As it does not have a battery, it is necessary to set the time of relay when it is
put into operation. In the event of a power loss, the clock will maintain date and time for
two days.

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2. APPLICATION
In its three versions (MLP1000, MLP2000, MLP3000 and MLP4000) the MLP is a
distance relay whose application range is in sub-transmission and distribution lines, in
power levels of up to 66 kV and exceptionally up to 132 kV in lines with 3 phase trip.
The MLP 1000 is the basic model of distance protection. It's main purpose is to
replace directional overcurrent relays, in cases where the overcurrent relay on its own (the
reach varies depending on the installed network voltage) has difficulties obtaining a good
selection level with another network protections under any operation condition.
The MLP2000 model includes an additional programmable recloser of up to three
reclosing attempts. This additional service lends an advantage over the MLP1000 as
instead of using it only as a directional line relay it can also be used with relatively long
lines where it is necessary to reinstall the service automatically.
The MLP3000 is the most sophisticated of the three models and includes a remote
open detector, a fuse failure detector, and a fault locator. In additionally it contains an
OSCILLOPERTURGRAFIC function and the possibility to be used with accelerated trip
schemes in zone 2 (through carrier communications or other procedures to perform a
logical trip). These advantages, make it very appropriate even in transportation networks
in isolated systems and with voltages of up to 132 kV. It can be used in emergency
situations with higher voltages, due to the fact that it is a relay with dedicated functions,
but factors such as trip speed and other incorporated back-up functions might make other
relay models such as the DLP, TLS and PLS more appropriate for these voltages.
The MLP4000 includes, in addition to the features of the MLP 1000, the
oscilloperturgrafic function.

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3. CHARACTERISTICS
3.1 GENERAL CHARACTERISTICS
- Accuracy, reliability and low consumption.
- Flush mounting.
- LED indicator for READY status.
- Built-in keyboard and display.
- Highly reliable solid state component.
- Microprocessor system.
- Self-checks (monitoring).
MODEL SELECTION
MLP * * * * M0 * 0 * 00 * DESCRIPTION
1MLP1000 Family
2MLP2000 Family
3MLP3000 Family
4MLP4000 Family
0Without test block (optional)
1With test block (standard)
1In=1A
5In=5A
Communications
1Keyboard and RS232
2Keyboard and 1mm plastic F.O.
3Keyboard and 100/140 glass F.O
4Keyboard and 50/125 glass F.O.
Vaux inputs
048 VDC
1125 VDC
2220 VDC
GVaux=48/125 VDC
HVaux=110/250 VDC
ARevision Level
The MLP relays are structured in three different families which include each of the
features listed below:
MLP 1000:
Three distance protection zones
Scaled distance protection scheme.
Zone 1 extension protection scheme
Out of step blocking
Fuse failure detector
Line Pick Up
Event register

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Current or power log
Communications
MLP2000:
Features similar to those shown for MLP 1000 plus the reclosing
operation.
MLP3000:
Features similar to those shown for MLP2000 plus following
additional functions:
Zone 2 acceleration (with channel)
Fault locator
Oscillography register
Fault report
3.2. TECHNICAL SPECIFICATIONS
Rated Current: In = 1 A or 5 A
Rated Voltage: Vn = 110/√13 ±20% VAC at 50 Hz
120/√13 ±20% VAC at 60 Hz
Frequency: 50 Hz or 60 Hz (switchable)
Auxiliary Power: 48/125 ±20% VDC
110/250 ±20% VDC
Auxiliary Voltage Inputs: 48 ±20% VDC
125 ±20% VDC
220 ±20% VDC
Thermal capacity:
Current Circuits:
Continuous: 4 x In
During 3 sec: 50 x In
During 1 sec: 100 x In
Voltage Circuits:
Continuous: 2 x Vn
During 1 min: 3.5 x Vn
Temperature Range:
Operation: -20°C to +55°C
Storage: -40°C to +65°C
Ambient Humidity: Up to 95% without condensation

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Trip contact capacity:
Make and Carry: 3000 W resistive during 0.2 seconds with a maximum
of 35 A and 380 VDC.
Break: 150 W resistive, with a maximum of 8 A or 380 VDC.
Carry Continuously: 8 A.
Make/Break delay: 10 ms/ 4 ms
Transmission start contact (REED relay):
Break: 20 W with 0.5 mA maximum or 500 VDC maximum
Make delay: 0.5 ms
Auxiliary contacts:
Operating Capacity: 1760 VA resistive with 8 A maximum or 380 VAC
or 250 VDC maximum
Connection Time: 12 ms (approx.) Release Time: 10 ms (approx.)
Communications:
Plastic Fiber Optics 1 mm:
Typical emitted power -8 dBm
Receiver sensitivity -39 dBm
Numerical aperture N.A. = 0.5
Wave Length 660 nm (visible red)
Crystal Fiber Optics 100/140:
Typical emitted power -11.5 dBm
Receiver sensitivity -25.4 dBm
Numerical aperture N.A. = 0.3
Wave length 820 nm (near infrared)
Connector type SMA
Crystal Fiber Optics 50/125:
Typical emitted power -17.5 dBm
Receiver sensitivity -25.4 dBm
Numerical aperture N.A . = 0.2
Wave length 820 nm (near infrared)