GE MLP1000 User manual

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MLP
MLP
MICROPROCESSOR BASED
DISTANCE PROTECTION
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GEK-98846A
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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)

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Type Tests:
Insulation test:
2 kV 50/60 HZ during 1 min (IEC 255-5).
Impulse test:
5 kV peak 1.2/50 aes, 0.5 J (IEC 255-5).
1 MHz noise test:
2.5 kV common mode. 1 kV differential mode, Class III
(IEC 255-22-1)
Electrostatic discharge:
Class III (IEC 255-22-2)
Radio Interference:
Class III (IEC 255-22-3).
Fast Transient:
Class III (IEC 255-22-4).
Accuracy:
Operation values:±5%
Operation time: ±5% or 30 ms (whichever is greater)
Number of zones:
Three zones (I, II, and III) and one dependent on zone I
(extended zone I)
Operating characteristics:
Zone I, extended zone I. and zone II:
Ground faults: Reactance or variable mho (selected by
user).
Fault between phases: Variable mho.
Characteristics angle for the reactance characteristic:
70° to 90° in 0.5° steps.
Reach setting:
Zone I: (0.01 - 12)x5/InΩ
Extended zone I: 1 to 2 times the zone I reach
Zone II: (0.01 - 50) x 5/In Ω
Zone III: (0.01 - 50) x 5/In Ω
Homopolar sequence compensation factor:

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1 to 7 in steps of 0.1
Positive sequence angle: 10° to 90° in 0.5° steps
Homopolar sequence angle: 10° to 90° in 0.5° steps
Operating time setting:
Zone I: 0 to 500 ms in 1 ms steps
Zone II: 100 ms to 3 s in 1 ms steps
Zone III: 120 ms to 10 s in 1 ms steps
Protection Schemes: Scaled distance
Zone I extension
Zone II acceleration (requires communications channel)
The scaled distance protection scheme is active even if one of the other two
protection schemes is selected.
RECLOSER SETTING RANGES (MLP2000 and MLP 3000)
Number of recloses: 0, 1, 2, 3 (setting 0 disables the recloser)
Reclosing time: From 0.2 to 99s in 0.01s steps
Closing time: From 0.1 to 99 s in 0.01 s steps
Reset time: From 0.1 to 99 s in 0.01 s steps
Delay time: From 0.1 to 99s in 0.01 s steps
OSCILLOGRAPHIC REGISTER (MLP3000 and MLP4000)
Number of oscillograms: 7
Number of cycles per oscillo: 240
DIMENSIONS
1 four height standard 19" rack
3.3 SETTINGS RANGES AND VALUES
General settings:
001 IDENTIFICATION:
20 characters ASCII to identify each MLP unit. The identification can be
modified only through serial communications with the relay. It cannot be
modified from the keyboard

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002 BREAKER NUMBER:
4 characters ASCII to identify the breaker associated with each MLP unit. As
with the identification, the breaker number can be modified only via serial
communications, not from the keyboard.
101 LINE DISTANCE:
The fine distance protected by the MLP system, can be set from 0.4 at 150 km,
in steps of 0.01 or 0.4 at 90 miles, in steps of 0.01, depending on relay
configuration.
102 CT RATIO:
Variable between I and 4000, ~n steps of 1.
103 PT RATIO:
Variable between I and 4000, in steps of 1.
104 RECORD TYPE:
Select between current log or power log. (see 4.15)
105 SYSTEM FREQUENCY:
Select between 50 Hz or 60 Hz depending on system to be protected.
106 ALLOW RECLOSER INHIBITION INPUT (IN_R): (MLP2000 and
MLP3000)
Enable or disable.
107 ALLOW EXTENDED Z1 PULL BACK INPUT (RZ1X):
Enable or disable.
108 ALLOW CARRIER RECEIVER INPUT (RCVR): (MLP3000)
Enable or disable.
109 ALLOW RECLOSER CANCEL INPUT: (MLP2000 and MLP3000)
Enable or disable.
110 ALLOW RECLOSING INITIATE INPUT (R_I): (MLP2000 and MLP3000)
Enable or disable.
111 ALLOW LINE PICK UP INPUT (LPU):
Enable or disable.

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112 ALLOW TRIP BLOCK INPUT (TRP_B):
Enable or disable.
113 ALLOW BREAKER STATUS INPUT (52B):
Enable or disable.
114 AMPS ACCUMULATED IN BREAKER OPENINGS:
Adjustable from 0 to 100.000 (kA2), in steps of 1. Each time the breaker is
opened, (kA2) is incremented by the number passing through the three phases
at the moment of opening. (See 4.16)
115 MAXIMUM ACCUMULABLE AMPS IN BREAKER OPENINGS
Adjustable from 0 to 100.000 (kA), in steps of 1. When the accumulated value
exceeds maximum an alarm is triggered. (See 4.6)
Protection Settings:
201 OUT OF STEP BLOCKING (OSB) IN SERVICE
Enable/Disable fine pick out function
202 LINE PICK UP (LPU) IN SERVICE:
Enable/Disable fine pick up function.
203 REMOTE OPEN DETECTOR (ROD) IN SERVICE: (MLP3000)
Enable/Disable remote open detector function.
204 FUSE FAILURE (FF) IN SERVICE:
Enable/Disable fuse failure function.
205 ALLOW RECLOSES AFTER A TRIP IN ZONE 2: (MLP3000 and MLP2000)
Enable/Disable.
206 ALLOW RECLOSES AFTER A TRIP IN ZONE 3:(MLP3000 and MLP2000)
Enable/Disable
207 MHO OR REACTANCE CHARACTERISTIC:
Select the mho of reactance characteristic for the phase-ground distance
measuring units in zone 1, extended zone 1 and zone 2.

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208 PROTECTION SCHEME:
Select between the following protection schemes:
0 - Scaled distance.
1 - Zone 1 extension.
2 - Zone 2 acceleration. (MLP3000)
When selecting scheme 1 or scheme 2, scheme 0 is also selected.
209 PROTECTION IN SERVICE:
Enable or disable the MLP distance protection.
210 ALLOW TRIP CAUSED BY REMOTE OPEN DETECTOR:(MLP3000)
Enable or disable.
211 ALLOW TRIP CAUSED BY A LINE PICK UP:
Enable or disable.
212 GENERAL TRIP AUTHORIZATION:
Even though certain types of trips are allowed, if the general trip
authorization is disabled all trips remain disabled.
213 ALLOW ZONE 3 TRIPS:
Enable or disable.
214 ALLOW ZONE 2 TRIPS
Enable or disable.
215 ALLOW ZONE I TRIPS:
Enable or disable.
216 LPU TIMER FUNCTION:
Even though the setting is variable between 0 and 150 ms, in 1 ms steps,
for design reasons it is recommended to set it to 128 ms. (See 4.5)
217 OSB TIMER FUNCTION:
Variable between 40 and 200 ms, in 1 ms steps. (See 4.8)
218 ROD TIMER FUNCTION: (MLP3000)
Variable between 0 and 150 ms, in I ms steps. (See 4.6)

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219 POSITIVE SEQUENCE LINE IMPEDANCE MODULE:
Variable between 0.01 and 12x5/In Ohms, in 0.001 Ohm steps.
220 POSITIVE SEQUENCE ANGLE OF MAXIMUM REACH:
Variable between 10° and 90°, in 0.50 steps.
221 ZERO SEQUENCE CURRENT COMPENSATION:
The zero sequence impedance module may be between 1 and 7 times the
positive sequence impedance module, in 0.01 Ohm steps.
ZOL
KO= ZIL
222 ZERO SEQUENCE ANGLE OF MAXIMUM REACH:
Variable between 40 and 90, in 0.5 steps.
223 ZONE 1 REACH:
Variable between 0.01 and 12x5/In Ohms, in 0.001 steps.
224 EXTENDED ZONE 1 REACH:
Variable between 1 and 2 times Zone 1 reach, in 0.01 Ohm steps.
225 ZONE 2 REACH:
Variable between 0.04 and 50x5/In Ohms. in 0.001 Ohms steps.
226 ZONE 3 REACH:
Variable between 0.01 and 50x5/In Ohms, in 0.001 Ohms steps (although not
used, you must set this higher than Z 1).

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227 REACTANCE CHARACTERISTIC ANGLE:
In case of selecting the minimum reactance for the phase-ground distance
measuring unit in Zone 1, the characteristic angle may vary between 70° and
90°, in 0.5° steps.
228 ZONE 1 TRIP TIMER:
Variable between 0 and 500 ms in 1 ms steps.
229 ZONE 2 TRIP TIMER:
Variable between 100 and 3000 ms in 1 ms steps.
230 ZONE 3 TRIP TIMER:
Variable between 100 and 10000 ms in 1 ms steps
231 CURRENT SUPERVISION THRESHOLD (IØs):
Distance measuring units are not permitted to operate under this threshold
adjustable between 0.15 and 3.00 times the rated voltage in 0.01 steps. This
threshold is typically set to 0.15 (See 4.3. DMU overcurrent supervision)
232 LPU OVERCURRENT THRESHOLD (IØld):
Above this threshold adjustable between 0.15 and 3.00 times the rated current
in 0.01 steps, the LPU operates when engaged; typically set to 3 00. (See 4.5)
Recloser settings:
301 NUMBER OF RECLOSING ATTEMPTS: (MLP2000 and MLP3000)
The number of reclosing attempts can be programmed up to a maximum of
three. If the number of attempts is set to 0 the recloser disables itself.
302 RECLOSING WAIT CONDITIONS: (MLP2000 and MLP3000)
Wait until reclosing inhibit signal disappears once it has been initiated. (See
4.9)
303 TIME DELAY FOR THE FIRST RECLOSING ATTEMPT: (MLP2000 and
MLP3000)
Variable between 0.20 s and 99.00 s, in 0.01 s steps. (See 4.9)
304 TIME DELAY FOR THE SECOND RECLOSING ATTEMPT: (MLP2000 and
MLP3000)
Variable between 0.20 s and 99.00 s, in 0.01 s steps.
305 TIME DELAY FOR THIRD RECLOSING ATTEMPT: (MLP2000 and MLP3000)

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Variable between 0.20 s and 99.00 s, in 0.01 s steps.
306 TIME DELAY FOR RECLOSING CONDITIONS: (MLP2000 and MLP3000)
Variable between 0.10 s and 99.00 s, in 0.01 s steps. (See 4.9)
307 DWELL TIME: (MLP2000 and MLP3000)
Variable between 0.10 s and 99.00 s, in 0.01 s steps. (See 4.9)
308 RESET TIME: (All models)
Variable between 0.10 s and 99.00 s, in 0.01 s steps. (See 4.9)
Event Masks:
003 EVENT MASKS:
Allow or disallow which events are registered for each of the following causes.
- Zone 1 trip.
-- Extended Zone 1 trip.
- Zone 2 trip.
- Extended Zone 2 trip.
- Accelerated Zone 2 trip.
- Zone 3 trip.
- ROD trip.
- LPU trip.
- Manual trip order.
- Manual trip closing order.
- Breaker open.
- Breaker close.
- Failure opening the breaker.
- No closing conditions.
- Failure closing the breaker.
- Permanent fault.
- Recloser manually blocked.
- Recloser manually unlocked.
- Fault cleared.
- Reclosing initiation.
- Disable ~2 B input.
- Disable external blocking trip.
- Disable line pick up input.
- Disable reclosing initiation input.
- Disable reclosing cancel input.
- Disable extended Zone 1 pull back input.
- Disable reclosing inhibition input
- Any measuring unit activation.
- Fuse failure.
- Carrier transmission
- Carrier reception.

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- Cold boot.
- Warm boot.
- Settings changed.
- Relay synchronization.
- Clear event file.
- Default settings.
- Default calibration.
- Current detected while breaker open.
- Power supply failure.
- Power supply restored.
- Event file deteriorated.
3.4 INTERRELATIONS BETWEEN SETTINGS
When setting the MLP distance relay you must take into account that the relay will
not only reject values which are outside of the permissible range, it will also reject setting
that are not coherent with the other setting . Therefore, when setting the MLP it is also
necessary to consider the relationship between the following setting:
General Settings:
106 ALLOW RECLOSER INHIBITION INPUT (IN_R): (MLP2000 AND MLP3000)
You may not disable this setting if the setting 302 RECLOSING WAIT
CONDlTIONS has been set to YES.
108 ALLOW CARRIER RECEIVER INPUT (RC\TR): (MLP1000)
You may not disable this setting if the setting 208 PROTECTIONS SCHEME
has been set to zone II acceleration.
114 AMPS ACCUMULATED IN BREAKER OPENINGS
You may not set this setting to value greater that set for 115 MAXIMUM
ACCUMULABLE AMPS IN BREAKER OPENINGS.
Protection Settings:
205 ALLOW RECLOSES AFTER A TRIP IN ZONE II: (MLP2000 AND MLP3000)
In the MLP 3000 model this setting permits recloses after a ROD trip.
218 ROD TIMER FUNCTION: (MLP3000)
You may not set this setting to value greater that set for 229 ZONE II TRIP
TIMER.
223 ZONE I REACH
You may not set this setting to value greater that set for 226 ZONE III REACH.

GEK-98846A
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225 ZONE II REACH
You may not set this setting to a value greater that set for 226 ZONE III
REACH.
228 ZONE I TRIP TIMER
You may not set this setting to value greater that set for 230 ZONE III TRIP
TIMER minus 20 ms.
229 ZONE II TRIP TIMER
You may not set this setting to value greater that set for 230 ZONE III TRIP
TIMER minus 20 ms.
Recloser settings:
303 TIME DELAY FOR THE FIRST RECLOSING ATTEMPT
304 TIME DELAY FOR THE SECOND RECLOSING ATTEMPT
305 TIME DELAY FOR THE THIRD RECLOSING ATTEMPT (MLP2000 and
MLP3000)
The reclosing time must not be set to a time less than the opening time of the
installed breaker; by doing so reclosing procedures cannot be performed since
the recloser, the recloser will be blocked at the end of a reclosing time and the
breaker will be closed instead of open.
308 RESET TIME: (All models)
When the setting 208 PROTECTION SCHEME has been set too ZONE I
EXTENSION, you may not set this timer to a value less than that set for 229
ZONE II TRIP TIMER.
4. PRINCIPLES OF OPERATION
4.1 INPUTS
The external connections of the MLP protection system can be seen in diagrams
3.1, 3.2, 3.3 and 3.4 (MLP1000), 3.5, 3.6,3.7, and 3.8 (MLP2000), 3.9, 3.10, 3.11, and
3.12 (MLP3000).
Digital Inputs
The protection system includes the following digital inputs:
CC-1: Breaker status (52/b)
CC-2: External trip block ( to the protection system)
CC-3: Line pick up (to the protection system)
CC-4: Reclosing initiate (to the recloser /MLP2000 and MLP3000)