ABB REU 523 Product manual

ABB Automation
REU 523
Combined Overvoltage and
Undervoltage Relay
Technical Reference Manual

ABB Automation 3
Combined Overvoltage and
Undervoltage Relay
Technical Reference Manual
REU 523
1MRS 750942-MUM
Issued: 07.06.99
Version: A/16.11.99
Checked: H.S.
Approved: S-M.H.
We reserve the right to change data without prior notice.
Contents
1. Introduction ...............................................................................5
1.1. About this manual .........................................................................5
1.2. The use of the relay ......................................................................5
1.3. Features ........................................................................................5
1.4. Guarantee .....................................................................................6
2. Safety Information .....................................................................7
3. Instructions ................................................................................8
3.1. Application .....................................................................................8
3.2. Requirements ................................................................................8
3.3. Configuration .................................................................................9
4. Technical Description .............................................................10
4.1. Functional description .................................................................10
4.1.1. Product functions .............................................................10
4.1.1.1. Schema of product functions ..............................10
4.1.1.2. Overvoltage, undervoltage and positive-phase-
sequence ............................................................10
4.1.1.3. Inputs .................................................................11
4.1.1.4. Outputs ...............................................................11
4.1.1.5. Circuit-breaker failure protection ........................11
4.1.1.6. Disturbance recorder ..........................................11
4.1.1.7. MMI module .......................................................11
4.1.1.8. Self-supervision ..................................................11
4.1.2. Configuration ....................................................................12
4.1.3. Protection .........................................................................13
4.1.3.1. Block diagram ....................................................13
4.1.3.2. Overvoltage unit .................................................13
4.1.3.3. Undervoltage unit ...............................................14
4.1.3.4. Positive-phase-sequence protection ..................15
4.1.3.5. Time/voltage characteristics ...............................16
4.1.3.6. Settings ..............................................................19
4.1.3.7. Technical data of protection functions ................27
4.1.4. Monitoring ........................................................................28
4.1.5. Self-supervision (IRF) ......................................................29
4.1.6. I/O test .............................................................................29
4.1.7. Disturbance recorder .......................................................29
4.1.7.1. Function .............................................................29
4.1.7.2. Recorder data ....................................................30

4ABB Automation
1MRS 750942-MUM
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual
REU 523
4.1.7.3. Control and indication of recorder status ...........30
4.1.7.4. Triggering ...........................................................30
4.1.7.5. Settings and unloading ......................................30
4.1.7.6. Event code .........................................................31
4.1.8. Recorded data .................................................................31
4.1.9. External serial communication .........................................32
4.1.9.1. Communication ports .........................................32
4.1.9.2. Event codes .......................................................33
4.1.9.3. Remote transfer data .........................................35
4.1.10.Relay parameterization ....................................................42
4.2. Design description ......................................................................42
4.2.1. Input / output connections ...............................................42
4.2.2. Serial communication connections ..................................45
4.2.3. Technical data .................................................................46
5. Ordering Information ............................................................. 50
6. References .............................................................................. 51
7. Index ........................................................................................ 52
8. Check Lists ............................................................................. 54
9. Customer Feedback ............................................................... 57

1MRS 750942-MUM Combined Overvoltage and Undervoltage Relay
Technical Reference Manual
REU 523
ABB Automation 5
1. Introduction
1.1. About this manual
This manual is intended to provide the user with thorough information on the relay
REU 523 and its applications. The focus in the manual is on technical description of
the relay.
Instructions for using the Man-Machine Interface (MMI) are found in separate
“Operator’s Manual” and for installation in “Installation Manual”.
1.2. The use of the relay
The three-phase voltage relay REU 523 is intended to be used for overvoltage and
undervoltage protection and supervision in distribution substations. It can also be
used for protection of generators, motors and transformers.
The relay featurestwo over- and two undervoltage protection functions that evaluate
the fundamental wave of the three phase-to-phase voltages but can also be
programmed to evaluate single phase-to-phase voltage. One of the undervoltage
stages can alternatively be set to evaluate the positive-phase-sequence voltage.
The protection relay REU 523 is based on a microprocessor environment. A self-
supervision system monitors continuously the operation of the relay.
The MMI includes an LCD display which makes the local use of the relay safe and
easy.
Local control of the protection relay can be carried out with a portable computer
connectedtothefrontconnector andremotecontrolvia therearconnectorconnected
to the distribution automation system through the serial interface and fibre-optic bus.
1.3. Features
• Overvoltage and undervoltage protection
• Single- or three-phase operation
•High-set overvoltage stage with definite-time or inverse definite minimum time
(IDMT) characteristic
•Low-set overvoltage stage with definite-time or IDMT characteristic
•High-set undervoltage stage with definite-time or IDMT characteristic
•Low-set undervoltage stage with definite-time or IDMT characteristic
•Positive-phase-sequence protection
•Settable drop-off/pick-up ratio for low-set overvoltage and low-set undervoltage
stages
• Circuit-breaker failure protection unit (CBFP)
• Disturbance recorder
• All settings can be modified with a personal computer
• Settings are stored in a non-volatile memory and remain even in case of power
supply failure
• MMI with an alphanumeric LCD and manoeuvring buttons