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ABB REU 523 Technical Reference Manual

Combined overvoltage and undervoltage relay
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REU 523
Combined Overvoltage and
Undervoltage Relay
Technical Reference Manual

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  • Page 1 REU 523 Combined Overvoltage and Undervoltage Relay Technical Reference Manual...
  • Page 3 1MRS 750942-MUM Combined Overvoltage and REU 523 Undervoltage Relay Issued: 07.06.99 Version: B/05.07.2002 Checked: A.S. Technical Reference Manual Approved: L.N. 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.
  • Page 4 REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual 4.1.8.1. Function ............. 30 4.1.8.2. Disturbance recorder data ......... 30 4.1.8.3. Control and indication of disturbance recorder status ..............31 4.1.8.4. Triggering ............32 4.1.8.5. Settings and unloading ........32 4.1.8.6.

  • Page 5: Introduction

    Interface (MMI), and to the Installation Manual for installation of the relay. 1.2. The use of the relay The voltage relay REU 523 is intended for over and undervoltage protection in medium voltage distribution networks but can also be used for protection of generators, motors and transformers.

  • Page 6: Guarantee

    • User-selectable rated frequency 50/60 Hz • User-selectable password protection for the HMI • User-selectable nominal voltage 100/110/115/120 V • Display of primary voltage values • Demand values • Multi-language support 1.4. Guarantee Please inquire the guarantee of your nearest ABB representative.

  • Page 7: Safety Information

    Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual Safety information Dangerous voltages can occur on the connectors, even though the auxiliary voltage has been disconnected National and local electrical safety regulations must always be followed The device contains components which are sensitive to electrostatic...

  • Page 8: Instructions

    Instructions 3.1. Application The over and undervoltage relay REU 523 is a secondary relay which is connected to the voltage transformers of the object to be protected. The over and the undervoltage unit continuously measure the fundamental wave of the phase-to-phase voltages of the object.
  • Page 9 Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual INDICATIONS CLEARED OUTP. CONT. UNLATCHED AND INDIC. CLEARED MEMORIZED VALUES AND INDIC. CLEARED; OUTPUT CONTACTS UNLATCHED SWITCHGROUP SELECTION )LJ  &RQQHFWLRQ GLDJUDP...

  • Page 10: Technical Description

    REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual Technical description 4.1. Functional description 4.1.1. Product functions 4.1.1.1. Schema of product functions efinite- or inverse-time overvoltage protection, low-set stage Definite- or inverse-time overvoltage protection, high-set stage Definite- or inverse-time undervoltage...

  • Page 11: Inputs

    4.1.1.4. Outputs The REU 523 is provided with two power outputs (PO1 and PO2) and two signal outputs (SO1 and SO2). Switchgroups SGR1...8 are used for routing start and trip signals from the protection stages to the desired signal or power output. PO1 and PO2 can be configured to be latched and the minimum pulse length to 40 or 80 ms.

  • Page 12: Self-Supervision

    4.1.1.9. Self-supervision The self-supervision system of the REU 523 manages run-time fault situations and informs the user about an existing fault. When the self-supervision system detects a permanent internal relay fault, the READY indicator LED will start to blink. At the same time the self-supervision alarm relay (also referred to as the IRF relay), which is normally picked up, will drop off and a fault code will appear on the LCD.

  • Page 13: Configuration

    Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual 4.1.3. Configuration The figure below illustrates how the start, trip and binary input signals can be configured to obtain the required protection functionality. OUTP. CONT. UNLATCHED AND INDICATIONS CLEARED MEMORIZED VALUES AND INDIC.CLEARED;...

  • Page 14: Protection

    REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual 4.1.4. Protection 4.1.4.1. Block diagram )LJ  %ORFN GLDJUDP 4.1.4.2. Overvoltage unit When the voltage values exceed the set start value of low-set stage U>, the overvoltage unit will start to deliver a start signal after a ~ 60 ms’ start time. When the set operate time at definite-time characteristic or the calculated operate time at IDMT characteristic elapses, the overvoltage unit will deliver a trip signal.

  • Page 15: Undervoltage Unit

    Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual 4.1.4.3. Undervoltage unit When the voltage values fall below the set start value of low-set stage U<, the undervoltage unit will start to deliver a start signal after a ~ 80 ms’ start time. When the set operate time at definite-time characteristic or the calculated operate time at IDMT characteristic elapses, the undervoltage unit will deliver a trip signal.

  • Page 16: Positive-Phase-Sequence Protection

    When the positive-phase-sequence voltage falls below the critical limit, the power plant will have to be disconnected from the network. The REU 523 measuring the positive-phase-sequence voltage complements other methods used to disconnect smaller power plants. The application of these methods...

  • Page 17: Time/Voltage Characteristics

    Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual The positive-phase-sequence protection function requires that the relay is in three-phase and not in single-phase use. 4.1.4.5. Time/voltage characteristics Each of the over and undervoltage stages can be given either a definite-time or an inverse definite minimum time (IDMT) characteristic.
  • Page 18 REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual Characteristic of the undervoltage stages The IDMT characteristic curve group C is designed for undervoltage stages U< and U<<. Stages U< and U<< can be configured to use different characteristics. The...
  • Page 19 Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual 1000 k>, k>> 0,05 0,01 U/U>, U/U>> )LJ  &KDUDFWHULVWLF RI W\SH $ 1000 k>, k>> 0,05 0,01 U/U>, U/U>> )LJ  &KDUDFWHULVWLF RI W\SH %...

  • Page 20: Settings

    REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual 1000 k<, k<< 0,01 U/U<, U/U<< )LJ  &KDUDFWHULVWLF RI W\SH & 4.1.4.6. Settings There are two alternative setting groups available, setting groups 1 and 2. Either of these setting groups can be used as the actual settings, one at a time.
  • Page 21 Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual Table 4.1.4.6-1 Setting values Setting Description Setting range Default setting U>/U Set start value of stage U> as a multiple of the rated voltage of the energizing input •...
  • Page 22 REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual Switch Position Weighting Value factor ∑ Checksum )LJ  $Q H[DPSOH RI FDOFXODWLQJ WKH FKHFNVXP RI D 6*B VHOHFWRU VZLWFKJURXS When the checksum, calculated according to the example above, equals the checksum of the relay, the switches in the switchgroup have been properly set.
  • Page 23 Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual SGF1...SGF4 Switchgroups SGF1...SGF4 are used for configuring the desired function as follows: Table 4.1.4.6-2 SGF1 Default Switch Function setting SGF1/1 Selection of the latching feature for power output PO1...
  • Page 24 REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual Table 4.1.4.6-3 SGF2 Default Switch Function setting SGF2/3 Tripping of stage U<< when conventional undervoltage measurement is in use • 0 = normal use for detecting loss of voltage when all voltages fall below the set value •...
  • Page 25 Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual Table 4.1.4.6-4 SGF3 Default Switch Function setting SGF3/5 The operation mode of the start indication of stage U< • 0 = the start indication will automatically be cleared once the fault has disappeared •...
  • Page 26 REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual SGB1 Table 4.1.4.6-6 SGB1 Resetting/blocking with BI Default Switch Function setting SGB1/1 • 0 = indications are not cleared by the binary input signal • 1 = indications are cleared by the binary input signal SGB1/2 •...
  • Page 27 Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual Not in use Not in use Not in use Not in use Checksum (factory setting) SGR1 ∑ SGR1= U> (12) SGR2 ∑ SGR2= t> SGR3 ∑ SGR3= U>>...

  • Page 28: Technical Data On Protection Functions

    REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual Non-volatile memory settings The table below presents data which can be configured to be stored in the non-volatile memory. All of the functions mentioned below can be selected separately with switches 1...5 in “MEMORY SETTINGS”.

  • Page 29: Indicator Leds And Alarm Indication Messages

    4.1.5. Indicator LEDs and alarm indication messages The operation of the REU 523 can be monitored by means of three indicators on the front panel of the relay: a green READY indicator LED, a yellow START indicator LED and a red TRIP indicator LED (refer to the Operator’s Manual for a more thorough presentation).

  • Page 30: Monitoring Of Demand Values

    4.1.6. Monitoring of demand values The REU 523 provides four different kinds of demand values. The first value shows the maximum voltage whereas the second value shows the minimum voltage of the three main voltages. The third value shows the average voltage of the three main voltages during one minute whereas the forth value shows the average voltage during ten minutes.

  • Page 31: Control And Indication Of Disturbance Recorder Status

    Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual The recording length varies according to the selected sampling frequency. The RMS curve is recorded by selecting the sampling frequency to be the same as the nominal frequency of the relay. The sampling frequency is selected with parameter M15; see the table below for details.

  • Page 32: Triggering

    4.1.9. Recorded data of the last events The REU 523 records up to five events. This enables the user to analyze the last five fault situations in the electrical power network. Each event includes the maximum and the minimum value of the measured main voltages, the voltage measured at the time of the trip, the minimum positive-phase-sequence value, start durations, and the time stamp.

  • Page 33: External Serial Communication

    RER 103 is used to connect the relay to the fibre-optic communication bus. Although the RER 103 supports LON bus communication, the REU 523 does not support the LON protocol. LON communication requires a separate LSG device.

  • Page 34: Iec 60870-5-103 Remote Communication Protocol

    The front connector is standardized for ABB relay products and requires a specific opto-cable (ABB art. no 1MKC950001-1). The cable is connected to the serial RS-232C port of the PC.
  • Page 35 )LJ  5(8  FRPPXQLFDWLRQ XVLQJ WKH ,(&B SURWRFRO The REU 523 will use the SPA bus protocol as default when the rear connection is in use. The IEC_103 protocol can be selected through the HMI of the relay. The selection is memorized and will therefore always be activated when the rear connection is in use.
  • Page 36 REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual Table 4.1.10.2-1 Information mapping of configuration set 1 Standard description of Event reason the information number (IEC 60870-5-103) E17/ auxiliary input 1 Activated/Reset E19/ auxiliary input 2 Activated/Reset...

  • Page 37: Event Codes

    Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual 7DEOH  ,QIRUPDWLRQ PDSSLQJ RI FRQILJXUDWLRQ VHW  Standard description of Event reason the information number (IEC 80870-5-103) U<< Trip E15/ Activated/Reset E17/ auxiliary input 1 Activated/Reset E19/...
  • Page 38 REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual Events to be included in the event reporting are marked with multiplier 1. The event mask is formed by the sum of the weighting factors of all those events which are to be included in the event reporting.

  • Page 39: Spa Bus Communication Protocol Parameters

    Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual Table 4.1.10.3-5 Event codes E31...33 Code Event Weighting factor Default value Disturbance recorder triggered HMI password opened HMI password reclosed Default value of event mask V158 Explanations of the default values:...
  • Page 40 REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual Settings Table 4.1.10.4-1 Settings Actual Group 1 Group 2 Variable Setting range settings (R) (R, W, P) (R, W, P) Set start value of stage U> 0.60...1.40 x U Operate time of stage U>...
  • Page 41 Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual Recorded data Parameter V1shows the maximum and parameter V2 the minimum voltage value measured as a multiple of the rated voltage, U , since the last master reset. Parameter V3 shows the average voltage value measured during one minute.
  • Page 42 REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual The last five recorded values can be read with parameters V11...V100. Event n denotes the last recorded value, n-1 the next one, and so forth. Table 4.1.10.4-3 Recorded data...
  • Page 43 Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual Table 4.1.10.4-4 Parameters for the disturbance recorder Description Parameter R, W Value/Note Triggering state, clearing and V246 R, W restart 0 = recorder not triggered 1 = recorder triggered and...
  • Page 44 REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual Control parameters Table 4.1.10.4-7 Control parameters Description Parameter R, W Value Unlatching output contacts V101 1 = unlatch Clearing registers and unlatching V102 1 = clear and unlatch...
  • Page 45 Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual Table 4.1.10.4-7 Control parameters Description Parameter R, W Value Re-reading of an event register Time, channel number and event code Type designation of the relay REU 523 Reading of relay state data...

  • Page 46: Self-Supervision (Irf) System

    4.1.11. Self-supervision (IRF) system The REU 523 is provided with an extensive self-supervision system which continuously supervises the software and the electronics of the relay. It handles run-time fault situations and informs the user about an existing fault via a LED on the HMI and a text message on the LCD.

  • Page 47: Design Description

    The energizing voltages are connected to terminals X1.1/1-3, X1.1/4-6 and X1.1/7-9. The nominal voltage (100/110/115/120 V) of the matching transformers has to be selected with SPA parameter V134 or via the HMI. The REU 523 can also be used in single-phase applications by setting switch 1 in switchgroup SGF2.
  • Page 48 REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual )LJ  5HDU YLHZ RI WKH UHOD\ Table 4.2.1-1 Inputs for voltages Terminal Function X1.1-1 X1.1-3 X1.1-4 X1.1-6 X1.1-7 X1.1-9 Note that the wiring has to be done identically for each of the matching transformers used Table 4.2.1-2...

  • Page 49: Serial Communication Connections

    4.2.2. Serial communication connections The REU 523 is interfaced with a fibre-optic bus by means of the bus connection module RER 103 via the D9S-type connector X2 located on the rear panel of the device. The terminals of the fibre-optic cables are connected to the counter terminals Rx (Receiver) and Tx (Transmitter) of the bus connection module.

  • Page 50: Technical Data

    REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual 4.2.3. Technical data Table 4.2.3-1 Dimensions Width, frame 111.4 mm, box 94 mm Height, frame 265.9 mm (6U), box 249.8 mm Depth 235 mm (245.1 mm with a protective rear cover, available as an option) Enclosure size 1/4 (x 19”)
  • Page 51 Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual Table 4.2.3-6 Signal outputs (SO1, SO2) and self-supervision (IRF) output Rated voltage 250 V ac/dc Continuous carry Make and carry for 3.0 s Make and carry for 0.5 s...
  • Page 52 REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual Table 4.2.3-10 Electromagnetic compatibility tests Radio frequency interference tests • Conducted, common mode According to the IEC 61000-4-6 10 V (rms), f=150 kHz…80 MHz • Radiated, amplitude-modulated According to the IEC 61000-4-3 10 V/m (rms), f=80…1000 MHz...
  • Page 53 • 4.8 or 9.6 kbps Auxiliary voltage The REU 523 requires a secured auxiliary voltage supply to operate. The internal power supply of the relay forms the voltages required by the relay electronics. The power supply is a galvanically isolated (flyback-type) DC/DC converter. When the auxiliary voltage is connected, the READY indicator LED on the front panel will be on.

  • Page 54: Ordering Information

    REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual Ordering information Order number REU523B 409BAA Article number 1MRS091409-BAA Protective cover for rear connectors 1MRS060132 Flush mounting kit 1MRS050209 Semi-flush mounting kit 1MRS050253 Wall mounting kit 1MRS050240 Side-by-side mounting kit 1MRS050241 19”...

  • Page 55: References

    Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual References Other available manuals: • Operator’s Manual, 1MRS751057-MUM • Installation Manual, 1MRS750526-MUM...

  • Page 56: Index

    REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual Index Application ....................8 Auxiliary voltage................48, 50, 53 Binary input..................49, 50 Binary input test ..................30 Block diagram .................... 14 CBFP ......................11 Characteristic of the undervoltage stages........... 18 Characteristics of the overvoltage stages ...........
  • Page 57 Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual IEC 60870-5-103 ..................34 Indication messages ................29, 46 Input/output connections ................47 Input/output signals ..................45 Inputs ....................11, 45 Internal relay fault ................12, 46, 49 Latching feature..................23 LCD ......................
  • Page 58 REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual SGB1 ......................26 SGF1...SGF4 ....................23 SGR1...SGR8 ..................26, 47 Signal diagram ................... 13 Signal outputs (SO1, SO2) ............11, 46, 49, 51 SPA bus communication protocol.............. 33 Switchgroups....................

  • Page 59: Abbreviations

    Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual Abbreviations Binary input CBFP Circuit-breaker failure protection Central processing unit IDMT Inverse definite minimum time characteristic IEC_103 Standard IEC 60870-5-103 Internal relay fault Liquid Crystal Display Light-emitting diode ®...

  • Page 60: Check Lists

    REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual Check lists Table 9.-1 Setting group 1 Group 1 Customer’s Variable Setting range Default setting (R, W, P) setting Set start value of stage U> 0.60...1.40 x U 1.20 x U...
  • Page 61 Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual Table 9.-2 Setting group 2 Group 2 Customer’s Variable Setting range Default setting (R, W, P) setting Drop-off/pick-up ratio D/P< of 1.01...1.05 1.03 stage U< Set start value of stage U<<...
  • Page 62 REU 523 Combined Overvoltage and Undervoltage Relay 1MRS 750942-MUM Technical Reference Manual Table 9.-4 Parameters for the disturbance recorder Customer’s Information Parameter Setting range Default setting setting Post-triggering recording length V240 0...100% in percent Internal trigger signals’ V241 0...127 checksum Internal trigger signal’s edge...

  • Page 63: Customer Feedback

    Combined Overvoltage and Undervoltage Relay REU 523 1MRS 750942-MUM Technical Reference Manual Customer feedback Date: To fax: +358 10 224 1080 Category: Comment Query Complaint In case of feedback related to a specific product, please state the name of the product.
  • Page 68 ABB Oy Substation Automation P.O. Box 699 FIN-65101 VAASA Finland Tel. +358 10 22 11 Fax. +358 10 224 1094 www.abb.com/substationautomation...

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