ABB REF 541, REF 543 and REF 545Feeder terminals

Features

• Feeder terminal for protection, control, measurement and supervision of medium voltage networks 

 • New application areas for power quality measurement, protection, capacitor bank protection and control and motor protection 

 • Voltage and current measurement via con ventional measuring transformers or cur rent and voltage sensors 

 • Fixed man-machine interface including a large graphic display, or an external display module for flexible switchgear installation 

 • Extended functionality including protec tion, control, measurement, communica tion, power quality and condition monitoring 

 • Protection functions including e.g. non directional and directional overcurrent and earth-fault protection, residual voltage, overvoltage and undervoltage protection, thermal overload protection, CBFP and auto-reclosing 

 • Control functions including local and remote control of switching objects, status indication of the switching objects and interlockings on bay and station level 

 • Measurement of phase currents, phase-to phase and phase-to-neutral voltages, residual current and voltage, frequency, power factor, active and reactive power and energy, etc. 

 • Condition monitoring including circuit breaker condition monitoring, trip circuit supervision and internal self-supervision of the feeder terminal 

 • Additional functions including synchro check, frequency protection, capacitor bank protection and control, measurement of current and voltage harmonics 

 • RTD/analogue module for temperature measurement, current/voltage measure ment and mA-outputs 

 • Communication over two communication interfaces: one for local communication with a PC and the other for remote commu nication via a substation communication system 

 • Part of the ABB Substation Automation system

Application

The REF 541, REF 543 and REF 545 feeder terminals are designed to be used for protec tion, control, measurement and supervision of medium voltage networks. They can be used with different kinds of switchgear including single busbar, double busbar and duplex sys tems. The protection functions also support different types of networks such as isolated neutral networks, resonant-earthed networks and partially earthed networks. Application area also covers medium-sized three phase asynchronous motors as well as protection and control of shunt capacitor banks used for reactive power compensation. In addition to protection, measurement, control and condi tion monitoring functions, the feeder termi nals are provided with a large amount of PLC functions allowing several automation and sequence logic functions needed for substa tion automation to be integrated into one unit. The data communication properties include SPA bus communication or LON bus com munication with higher-level equipment. Fur ther, the LON communication together with the PLC functions minimizes the need for hardwiring between the feeder terminals.

Design

The feeder terminals REF 541, REF 543 and REF 545 differ from each other regarding the number of digital inputs and outputs avail able. Please, refer to section “Ordering” for more details. These feeder terminals incorpo rate a wide range of feeder terminal func tions: 

 • Protection functions 

 • Measurement functions 

 • Power quality functions 

 • Control functions 

 • Condition monitoring functions 

 • General functions 

 • Communication functions 

 • Standard functions The function blocks are documented on the CD-ROM “Technical Descriptions of Func tions” (1MRS 750889-MCD).

Protection functions

Protection is one of the most important func tions of the REF 54_ feeder terminal. The protection function blocks are independent of each other and have their own setting groups, data recording, etc.

Either Rogowski coils or conventional cur rent transformers can be used for protection functions based on current measurement. Correspondingly, voltage dividers or voltage transformers are used for protection functions based on voltage measurement.

For further information about functionality levels and the protection functions included in them, refer to the table “Functionality lev els, protection functions” in section “Ordering”.

Measurement functions

The measurement functions include three phase currents, neutral current, three-phase voltages, residual voltage, frequency, active and reactive power and power factor. In addi tion, other measurement functions are avail able.

As a standard feature the REF 54_ terminal includes pulse counter inputs. The number of pulse inputs varies from 7 (REF 541) to 10 (REF 545) according to the REF variant.

Disturbance recorder

record 16 current or voltage waveforms and 16 logic digital signals. The sampling fre quency of the analogue inputs is 2 kHz at the rated frequency of 50 Hz and 2.4 kHz at the rated frequency of 60 Hz.

The user can set the length of a recording within a range determined by the number of analogue inputs used. The number of record ings depends on the sampling frequency, length of recordings and number of analogue inputs.

The recordings can be uploaded with a DR Collector Tool which converts the data to a COMTRADE format. The DR-Collector Tool is supported in CAP501 and CAP505 relay tools.

Power quality functions

Power quality functions enable measurement of total harmonic distortion (THD) of voltage and current, and total demand distortion (TDD) of current. Individual harmonics are measured up to 13th.

The power quality functions produce statisti cal data about harmonic distortion for long term evaluation. Short time average and max imum values for THD and individual har monics are also supported.

LIB 510 supports graphical presentation of harmonics in the PQ Monitoring Tool.

Control functions

The control functions are used to indicate the status of switching devices, i.e. circuit break ers and disconnectors, and to execute open and close commands for controllable switch ing devices of the switchgear. Furthermore,

control functions provide on/off switching objects for control logic purposes and miscel laneous objects for data monitoring, etc. The control functions configured with the CAP 505 Relay Product Engineering Tools are linked to object status indicators included in the MIMIC configuration picture displayed on the MMI. The object status indicators are used to indicate the status of switching devices via the MIMIC picture and to control them locally. The status of different objects, e.g. open/close/undefined, displayed in the MIMIC view can be freely designed.

Condition monitoring functions

Condition monitoring function blocks such as supervision of the energizing current and voltage input circuit, operation time counter, circuit breaker electric wear, scheduled main tenance, trip circuit supervision and breaker travel time are available for the REF 54_ feeder terminals.

General functions

Additional functions are available for differ ent general purposes to be used in logics such as activation of MMI backlight, switch groups, and resetting of operation indications, latched output signals, registers and distur bance recorder.

Communication functions

The feeder terminal REF 54_ provides two serial communication protocols: SPA and LON.

Standard functions

Standard functions are used for logics such as interlocking, alarming and control sequenc ing. The use of logic functions is not limited and the functions can be interconnected with each other as well as with protection, mea surement, power quality, control, condition monitoring and general functions. In addition, the digital inputs and outputs and LON inputs and outputs can be connected to standard functions by using the Relay Configuration Tool.

Other functions

Low auxiliary voltage indication The REF 54_ feeder terminal is provided with a low auxiliary voltage indication fea ture. The power supply module issues an internal alarm signal when a drop in the power supply voltage is detected (ACFail, active low). The alarm signal is activated if the power supply voltage falls about 10% below the lowest rated DC input voltage of the power supply module. The indication of a low auxiliary voltage is available in the feeder terminal configuration environment and can be configured to acti vate an alarm. Overtemperature indication The REF 54_ feeder terminal includes an internal temperature supervision function. The power supply module issues an internal alarm signal when overtemperature has been detected inside the terminal enclosure. The alarm signal will be activated once the tem perature inside the terminal enclosure increases to +78°C (+75°...+83°C). Over temperature indication is available in the feeder terminal configuration and can be con figured to activate an alarm. Analogue channels The feeder terminal measures the analogue signals needed for protection, measuring, etc. via sensors or galvanically separated match ing transformers. Depending on whether sensors are included or not, REF 54_ feeder terminals have 9 (without sensors) or 10 (with sensors) ana logue channels. The number of channels used depends on the feeder terminal configuration and the kind of matching transformers or sen sor inputs used. In addition to 9 conventional matching trans formers, sensors developed by ABB can be used parallel in REF 54_ feeder terminals. The feeder terminal has 9 sensor inputs. A current sensor (Rogowski coil) or a voltage divider can be connected to each sensor input. Please, see the connection diagram below for details. When ordering, please note the type of analogue inputs. Analogue channels of the feeder terminal are configured with the CAP 505 Relay Product Engineering Tools. A separate scaling factor can be set for each analogue channel. The factors enable differ ences between the ratings of the protected unit and those of the measuring device (CTs, VTs etc.). The setting value 1.00 means that the rated value of the protected unit is exactly the same as that of the measuring device.

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