GE MLJ1005B010H00C MLJ Digital Synchromism Check

MLJ Digital Synchromism Check

Features and Benefits

RS485. RS232 or fiber comm. available

Configurable auxiliary outputs

V  f  Hz line and bus metering

Continuous or manual modes

Part of a modular system

Independent 2" or 4" modules

1/4 or 1/8 standard 19" rack case available

3 digit display

Applications

Generator and network synchronism

Bus or line synchronism check

Manual closing of breakers

Protection and Control

Synchronism check operation

Undervoltage supervision

DLDB, DLLB and LLDB indication

Description

The MLJ is a digital synchronism

check relay that measures bus

and line voltages, checking:

voltage differences

frequency slip

phase angle between both volt

ages

The main applications of the MLJ

are:

connection of a generator to the

network

reestablishing the connection

between two parts of the

network

manual closing of breakers

a continuous mode in which it

constantly checks the synchro

nism

the manual mode is activated

when voltage is applied to a

manual digital input, initiating

the synchronism supervision

when voltage is applied by

another check starting digital

input

The synchronism function (with

the presence of line and bar volt

age) can be supervised by two

undervoltage units that permit

the synchronism function when

both voltages are above the set

value.

The relay sends a closing output

to the breaker when all of the

values fall within the set limits

and maintain these values for a

period of time which has been set

by the user. If any of the condi

tions are not met, the relay will

provide a close condition fault

signal.

The relay has two operational

modes:

Additionally, the relay contains

dead line-dead bus (DLDB), dead

line-live bus (DLLB) and live line

dead bus (LLDB) units, with the

ability to select any combination

of them through independent

settings.

The basic relay, MLJ1000. and

the RS-485 communications

model, MLJ1005. are mounted in

a 2" module that is compatible

with the MID industrial systems.

They can also be provided in an

individual 1/8 rack. The relays

with additional communications

via RS232 and plastic or glass

fiber optics, models MLJ1006 and

MLJ1007. come with an addition

al 2" card. The set can be

mounted in either a 4" module for

MID compatibility or a 1/4 rack

case to be used as a stand alone

relay.

Functions

programmable synchronism

verification (voltage, phase and

frequency)

two operating modes: continu

ous and manual

dead line-dead bus (DLDB), dead

line-live bus (DLLB) and live line

dead bus (LLDB) units

real time measuring of line and

bus voltages, voltage difference,

phase difference and slip

registering of the last close

permitted

visual indication of the line and

bus status (live/dead)

configurable auxiliary outputs

local interface with push buttons

and display

RS485. RS232 and fiber optics

communications

self test functions

compatible with MID industrial

systems