Mikro MK 3000L, Руководство пользователя

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3
1.0 Introduction
The purpose of this manual is to provide information necessary to install, operate and maintain the
Mikro MK3000L relay.
MK3000L provides protections for 3 independent phase overcurrent elements and one non-
directional earth-fault element. All these elements are connected to the current transformers of the
feeders to be protected. There are 2 sets of current inputs, for 1A and 5A rated CTs.
The relay comes with liquid crystal display (LCD) with 2 x 16 back-lit alphanumerical characters
and 7 LEDs in which 4 of the LEDs are programmable. An 8 button keypad can be used to access
all measurements, alarm or trip records and settings. Dedicate Open CB (circuit breaker) and Close
CB button is used to manually open and close CB.
There is a RS232 port available on the front panel and a RS485 port on the rear terminals. Using
MODBUS RTU protocol, all stored information including alarm, trip and disturbance records can
be read and settings can be modified with a PC loaded with setting software.
MK3000L has 4 configurable output relays. They can
be activated by any of the protection
functions available in the relay. There is also 1 output relay for internal fault indication. There are 2
configurable logic inputs for various functions.
1.1 Symbols and Definitions
In this manual and on the relay, unless the context otherwise requires, the following symbols and
abbreviations shall apply throughout:-
AC : Alternating current
Ack : Acknowledge
Alrm : Alarm
Aux : Auxiliary
CT : Current transformer
CB : Circuit breaker
CBFP : Circuit Breaker Failure Protection
Chg : Change
CLPU : Cold Load Pickup
DC : Direct current
Dmd : Demand
Dmnd : Demand
DMT : Definite time
EF : Earth fault
E/Gnd : Earth/Ground
Genrl : General
IDMT : Inverse definite minimum time
IL1 : Phase 1 current
IL2 : Phase 2 current
IL3 : Phase 3 current
I> : Phase overcurrent first threshold
I>> : Phase overcurrent second threshold
I>>> : Phase overcurrent third threshold
Io/IN : Earth (fault) current
Io> : Earth fault first threshold
Io>> : Earth fault second threshold
Io>>> : Earth fault third threshold
I2> : Negative sequence overcurrent first
threshold
I2>> : Negative sequence overcurrent second
threshold
Invrse : Inverse
Ip : Input
IRF : Internal Relay Failure
LED : Light emitting diodes
Lockd : Locked
OC : Overcurrent
OL : Overloaded
PU : Pickup
RCRD : Record
Reclsr
: Recloser
Rmote : Remote
Rst : Reset
Strt : Start
TCS : Trip circuit supervision
Thml : Thermal
tI> : Phase overcurrent first threshold trip
tI>> : Phase overcurrent second threshold trip
tI>>> : Phase overcurrent third threshold trip
tIo> : Earth fault first threshold trip
tIo>> : Earth fault second threshold trip
tIo>>> : Earth fault third threshold trip
tI2> : Negative sequence overcurrent first
threshold trip
tI2>> : Negative sequence overcurrent
second threshold trip