Protection Relay REX 521. Technical Reference Manual, General

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1 Protection Relay REX 52

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3 MRS7508-MUM Issued: Version: H/ Protection Relay REX 52 Contents. About this manual This manual Use of symbols Related documents Document revisions Safety information Introduction General Application Hardware versions Requirements Technical description Functional description Parametrization Local parametrization External parametrization Relay Setting Tool view Graphical I/O Setting Tool Factory settings Non-volatile memory Real-time clock Auxiliary voltage Power supply versions Low auxiliary voltage indication Overtemperature indication Analog channels Scaling the rated values of the protected unit for analog channels Technical data of the measuring devices Calculated analog channels Select Io Rated frequency Digital inputs Filtering of digital inputs Inversion of digital inputs Outputs High-speed power output (HSPO) Single-pole power outputs (PO) Signalling outputs (SO)

4 REX 52 Protection Relay MRS7508-MUM Testing inputs and outputs Trip-circuit supervision Self-supervision Fault indication Fault indication texts Serial communication Optical communication port on the rear panel Isolated RS-485 connection on the rear panel Front panel optical connection for a PC The service pin located on the rear panel SPA bus LON IEC bus Modbus DNP 3.0 Bus IEC 6850 communication by using SPA-ZC Profibus-DPV communication by using SPA-ZC Time synchronization Display panel (HMI) Indication LEDs Alarm LEDs Special features of alarm LEDs Writing signal names on alarm LED label Design description Technical data Terminal diagram of REX 52: Basic Terminal diagram of REX 52: Medium Terminal diagram of REX 52: High (excluding H08 and H09) Terminal diagram of H08 and H09 configurations Terminal diagram of REX 52: Sensor Terminal connections Service Ordering information

5 MRS7508-MUM Protection Relay REX Revision history of REX Revision identification Changes and additions to earlier released revision E Configuration, setting, and SA system tools Appendix A: IEC bus Functions supported by REX General principle of application data mapping Principle of the protection functions mapping Class 2 data Default mappings Appendix B: Parameters visible only in the relay Appendix C: Parameters which cause reset Appendix D: Parameters which require test mode Abbreviations Index...8 5

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7 MRS7508-MUM Protection Relay REX 52 Copyrights The information in this document is subject to change without notice and should not be construed as a commitment by ABB Oy. ABB Oy assumes no responsibility for any errors that may appear in this document. In no event shall ABB Oy be liable for direct, indirect, special, incidental or consequential damages of any nature or kind arising from the use of this document, nor shall ABB Oy be liable for incidental or consequential damages arising from use of any software or hardware described in this document. This document and parts thereof must not be reproduced or copied without written permission from ABB Oy, and the contents thereof must not be imparted to a third party nor used for any unauthorized purpose. The software or hardware described in this document is furnished under alicense and may be used, copied, or disclosed only in accordance with the terms of such license. Copyright 2006 ABB Oy All rights reserved. Trademarks ABB is a registered trademark of ABB Group. All other brand or product names mentioned in this document may be trademarks or registered trademarks of their respective holders. Guarantee Please inquire about the terms of guarantee from your nearest ABB representative. 7

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9 MRS7508-MUM Protection Relay REX 52. About this manual.. This manual.2. Use of symbols This document provides a general description of the protection relay REX 52 Revision G. For more information about the earlier revisions, refer to section Revision history of REX 52 on page 63. For detailed information about the separate functions, see REX 52 Technical Reference Manual, Standard Configurations (see Related documents on page 0). This publication includes the following icons that point out safety-related conditions or other important information: The electrical warning icon indicates the presence of a hazard which could result in electrical shock. The caution icon indicates important information or warning related to the concept discussed in the text. It might indicate the presence of a hazard which could result in corruption of software or damage to equipment or property. The information icon alerts the reader to relevant facts and conditions. Although warning hazards are related to personal injury, it should be understood that operation of damaged equipment could, under certain operational conditions, result in degraded process performance leading to personal injury or death. Therefore, complyfully with all warning and caution notices. 9

10 REX 52 Protection Relay MRS7508-MUM.3. Related documents Manuals for REX 52 Technical Reference Manual, Standard Configurations Operator s Manual Installation Manual Technical Descriptions of Functions (CD-ROM) Modbus Remote Communication Protocol for REX 52, Technical Description DNP 3.0 Remote Communication Protocol for REF 54_, RET 54_ and REX 52, Technical Description MRS75802-MUM MRS 7507-MUM MRS MUM MRS MCD MRS75507 MRS Parameter and event lists for REX 52 Parameter List for REX 52 Event List for REX 52 General Parameters for REX 52 Interoperability List for REX 52 MRS75999-RTI MRS RTI MRS75256-RTI MRS75257-RTI Tool-specific manuals CAP505 Installation and Commissioning Manual CAP505 User s Guide CAP505 Protocol Mapping Tool Operator s Manual Tools for Relays and Terminals, User s Guide CAP 50 Installation and Commissioning Manual CAP 50 User s Guide MRS7590-MEN MRS MEN MRS MRS MUM MRS75899-MEN MRS75900-MUM.4. Document revisions Version Date History E Manual updated to include DNP 3.0 F Minor updates G Layout updated FB updates IRF code 70, HMI error, added Standard configurations H09, H50, H5 added New HMI Selectable ANSI/IEC FB naming H Small corrections to the standard configuration table 0

11 MRS7508-MUM Protection Relay REX Safety information Dangerous voltages can occur on the connectors, even though the auxiliary voltage has been disconnected. Non-observance can result in death, personal injury or substantial property damage. Only a competent electrician is allowed to carry out the electrical installation. National and local electrical safety regulations must always be followed. The frame of the device has to be carefully earthed. The device contains components which are sensitive to electrostatic discharge. Unnecessary touching of electronic components must therefore be avoided. Breaking the sealing tape on the rear panel of the device will result in loss of warranty and proper operation will no longer be guaranteed.

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13 MRS7508-MUM Protection Relay REX Introduction 3.. General The protection relay REX 52 is designed for protection, control, measuring, and supervision in medium voltage networks. Typical applications include incoming and outgoing feeders as well as substation protection. The protection relay is provided with energizing inputs for conventional current and voltage transformers. Also a hardware version with inputs for current and voltage sensors is available. The protection relay is based on a multiprocessor environment. The HMI (HumanMachine Interface) including an LCD (Liquid Crystal Display) with different views makes the local use easy and informs the user via indication messages. Modern technology is applied both in hardware and software solutions. The REX 52 is part of the substation automation concept for Distribution Automation and extends the functionality and flexibility of the concept further. A05897 Fig REX 52 protection relay. HMI is referred to as MMI (man-machine interface) in the relay and in the Relay Setting Tool. 3

14 REX 52 Protection Relay MRS7508-MUM 3.2. Application Table Standard configurations for REX 52 The REX 52 is designed for protection of incoming and outgoing feeders in medium voltage distribution substations. Further, the relay can, for example, be applied to back-up protection of power transformers and back-up for high voltage line protection relays. HW versions Basic Medium High/Sensor Standard configurations B0 B02 M0 M02 H0 a H02 H03 H04 H05 H06 H07 H08 bc H09 bc H50 b H5 b IEC symbol Protection ANSI device number FB name (CD-ROM) 3I> 5- NOC3Low x x x x x x x x x x x x x x 3I>> 5-2 NOC3High x x x x x x x x x x x x x x 3I>>> 5-3 NOC3Inst x x x x x x x x x x x x x Io> 5N- NEFLow x x x d x x x x x x Io>> 5N-2 NEFHigh x x x d x x x x x x Io>>> 5N-3 NEFInst x x x d x x x Io>--> e 67N- DEF2Low x x x x x x x x x Io>>--> e 67N-2 DEF2High x x x x x x x x x Io>>>--> e 67N-3 DEF2Inst x x x x x x 3I>--> 67- DOC6Low x f x f x f x f 3I>>--> 67-2 DOC6High x f x f x f x f 3U> 59- OV3Low x x x x x x x 3U>> 59-2 OV3High x x x x x x 3U< 27- UV3Low x x x x x x x 3U<< 27-2 UV3High x x x x x x 3I2f> 68 Inrush3 x x x x x x x x x x x x Iub> 46 CUB3Low x x x x x x x x 3Ith> 49F TOL3Cab x x x x x x x x O-->I 79 AR5Func x x x x x x x x Uo> 59N- ROVLow x x x x x x Uo>> 59N-2 ROVHigh x x x x x Uo>>> 59N-3 ROVInst x x x x f 8- FreqSt x x x x x x x f2 8-2 FreqSt2 x x x x SYNC 25- SCVCSt x x Is2t n< 48 MotStart x x 3I() 46R PREV3 x x I2> 46- NPS3Low x x I2>> 46-2 NPS3High x 3I< 37- NUC3St x FUSEF 60 FuseFail x x 3Ithdev> 49M/G/T Tol3Dev x x x x UU2<>_ 47- PSV3St x x x 4

15 MRS7508-MUM Protection Relay REX 52 Table Standard configurations for REX 52 (Continued) HW versions Basic Medium High/Sensor Standard configurations B0 B02 M0 M02 H0 a H02 H03 H04 H05 H06 H07 H08 bc H09 bc H50 b H5 b IEC symbol ANSI device number FB name (CD-ROM) Control functions I<->O CB COCB COCB x x x x x x x x x x x x x x x I<->O IND COIND COIND x x x x x x x x x x x x x x x I<->O IND2 COIND2 COIND2 x x x x x x x x x x x x x x x I<->O IND3 COIND3 COIND3 x g x g I<->O POS COLOCAT COLOCAT x x x x x x x x x x x x x x x ALARM-8 ALARM-8 MMIALAR-8 x x x x x x x x x x x x x x x Measurement 3I 3I MECU3A x x x x x x x x x x x x x x x Io Io MECUA x x x x x x x x x x x x x x x Uo Uo MEVOA x x x x x x x x x x x x x DREC DREC MEDREC x x x x x x x x x x x x x x x 3U 3U MEVO3A x x x x x x x x x x x 3U_B 3U_B MEVO3B x x f f MEFR x x x x x x x x x x x PQE PQE MEPE7 x x x x x x x x x x x AI AI MEAI x x Condition monitoring CB wear CB wear CMBWEAR x x x x x x x x x x x x x x x TCS TCS CMTCS x x x x x x x x x x x x x x x MCS 3I MCS 3I CMCU3 x x x x x x x x x x x x x x x MCS 3U MCS 3U CMVO3 x x x x x x x x x x x TIME TIME CMTIME x x Power quality monitoring PQ 3Inf PQ 3Inf PQCU3H x x x x x x x x x x x x x x x PQ 3Unf PQ 3Unf PQVO3H x x x x x x x x x x x Standard SWGRP SWGRP SWGRP x x x x x x x x x x x x x x x a. H0 available only as sensor version b. Not available as sensor version c. VTs are used to measure phase-to-earth voltages, calculated phase-to-phase voltages are shown by 3U_B d. Configured fixedly to the Io (/5 A) channel or Ios if selected e. Can be used as Io>, Io>> and Io>>> or Uo>, Uo>> and Uo>>> function block with some limitations f. 3I>-> and 3I>>-> cannot be set to operate as 3I>, 3I>> or 3I>>> g. Motor status indication Calculated Uo (Uos) is used in the Sensor versions of H0 and H03 configurations. Calculated Io (Ios) is available in H0-H05, H08, H09 and H50 configurations. For more information, see REX 52 Technical Reference Manual, Standard Configurations (see Related documents on page 0). 5

16 REX 52 Protection Relay MRS7508-MUM 3.3. Hardware versions Table Hardware versions of REX 52 Relay type REX 52 Version name Basic Medium High Sensor Transformer modules (MIM) Transformers Current transformers /5 A Current transformers 0.2/ A Voltage transformers 00 V 4 Sensor channels Current sensor inputs 3 Voltage sensor inputs 3 Main CPU modules CPU_SP (SPA/ IEC/MODBUS plastic) CPU_SG (SPA/ IEC/MODBUS glass) CPU_LP (SPA/ IEC/ LON/MODBUS plastic) CPU_LG (SPA/ IEC/ LON/MODBUS glass) Power supply modules PS_87H (DItresh.=80 VDC) PS_87L (DItresh.=8 VDC) Display module 6 x 6 character display Digital inputs 9 High-speed power outputs Power outputs (PO) 3 Signalling outputs (SO) 2 IRF outputs Trip-circuit supervision (TCS) REX52xBxxx REX52xMxxx REX52xHxxx REX52xSxxx 6

17 MRS7508-MUM Protection Relay REX Requirements If the environmental conditions differ from those specified in section Technical data on page 48, as to temperature and humidity, or if the environmental conditions around the protection relay contain chemically active gases or dust, the relay should be visually inspected in association with the secondary testing. The visual inspection should focus on: Signs of mechanical damage to the relay case and terminals. Signs of corrosion on terminals or on the case. For information about the maintenance of relays, refer to section Service on page 59. Protection relays are measuring instruments and should be handled with care and protected against moisture and mechanical stress, especially during transport. 7

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19 MRS7508-MUM Protection Relay REX Technical description 5.. Functional description 5... Parametrization To ensure that a protection function block protects the feeder in the desired manner, the default values of parameters must be checked and set before taking the function block into use. The parameters can be set either locally over the HMI or externally via the serial communication using Relay Setting Tool. See Serial communication on page Local parametrization The parameter to be changed is entered by navigating in the menu structure. For detailed instructions, see Operator s Manual (see Related documents on page 0) External parametrization The Relay Setting Tool and/or Graphical I/O Setting Tool is used for external parametrization of the protection relay. The parameters can be set by using a PC and downloaded to the protection relay over a communication port. The menu structure of the setting tool, including parametrization and settings views, is the same as the menu structure of the protection relay. The use of the tool is instructed in Tools for Relays and Terminals, User s Guide (see Related documents on page 0). Fig Main dialog box of the Relay Setting Tool A Some parameters are visible only in the relay, see the list on page 73. 9

20 REX 52 Protection Relay MRS7508-MUM Relay Setting Tool view To improve usability, a REX 52 specific pull-down menu, View, with three views has been created to the Relay Setting Tool. A05899 Fig Relay Setting Tool views The Settings view includes the parameters for setting of all the function blocks. The Configuration view includes signalling and hardware related settings. The parameters in the Configuration view are advised to be set during commissioning and service because some of the parameters cause resetting of the device. See Appendix C: Parameters which cause reset on page 75 for a list of these parameters. In that case the disturbance recorder DREC will be cleared. Measured values and registered data, for example current, digital input states, can be uploaded by means of the Measurements & Registered Data view Graphical I/O Setting Tool When uploading or downloading parameters with Relay Setting Tool by using the option All, it covers only the parameters of the selected view (that is, Settings, Configuration, or Measurements & Registered Data). To make the external relay parametrization even easier, a REX 52 specific Graphical I/O Setting Tool has been added to the Relay Setting Tool. The Graphical I/O Setting Tool offers a user-friendly environment for better visualization and makes it easier to get a complete overview of the settings. The tool is used for setting input switchgroups, output switchgroups, and Alarm LED switchgroups. Using this tool is instructed in Tools for Relays and Terminals User's Guide (see Related documents on page 0). 20

21 MRS7508-MUM Protection Relay REX 52 Fig Graphical I/O Setting Tool A Factory settings The factory settings for the relay can be restored by selecting Activate from HMI path Configuration\General\Software\Factory settings. After this, the relay will reset itself immediately and start with the factory-set parameter values. When starting again, the relay display shows the text :WARNING EEPROM -> FLASH on the display. This means that the calibration parameters have been read from the MIM card and copied to the non-volatile memory of the CPU card. After ten seconds, the relay will reset itself again, and takes the correct calibration parameters into use. The unnecessary restoring of factory settings should be avoided because all the parameter settings that are written earlier to the relay will be lost, that is, overwritten with the default values. During normal use this can cause a protection function to trip when the settings are suddenly changed. 2

22 REX 52 Protection Relay MRS7508-MUM Non-volatile memory Real-time clock Auxiliary voltage The protection relay is equipped with a non-volatile memory for preserving important data during auxiliary supply breaks. For example, when a setting value is changed, the new value is stored in the memory at the moment of sending it to the relay, without additional store commands. The memory does not need batteries, and a lifelong service is guaranteed. Following data is stored in the non-volatile memory: Setting values Display state Lockout state Recorded values Last 50 events When the relay is restarted, the LED indication and text displayed before the auxiliary supply break are restored on the display. More information about the alarm LEDs can be found in section Alarm LEDs on page 45. Recorded values are stored from start, trip and other important events. After an auxiliary power break, time and date and fault currents for the three last events can be viewed by navigating to the Recorded values section of the function block that caused an indication. The last 50 events that occurred before the auxiliary power supply break can be viewed in the HMI event buffer. Time and date for the events are also restored. The real-time clock (RTC) is used for time stamping of events. It is also running during auxiliary power breaks. When the supply is re-established, the relay sets the right time and new events are stamped accordingly. The protection relay is provided with a -week capacitor back-up protection 2 that enables the internal clock to keep time in case of an auxiliary power failure. For its operation, the protection relay requires a secured auxiliary voltage supply. The protection relay s internal power supply module forms the voltages required by the protection relay electronics. The power supply module is a galvanically isolated (flyback-type) DC/DC converter. A green LED indicator on the front panel is lit when the power supply module is in operation.. Because the storing of the recorded values is a background task, it might be affected by a sudden auxiliary power failure. 2. Capacitor ageing may decrease the back-up time. 22

23 MRS7508-MUM Protection Relay REX Power supply versions There are two basic versions of power supply modules available for REX 52 protection relays: type PS_87H and type PS_87L. The input voltage range of the power supply module is marked on the front panel of the REX 52 unit. The power supply version is specified by a letter in the order number of the protection relay (refer to section Ordering information on page 6). The voltage range of the digital inputs is tied to the selected power supply. If a power supply version with the higher rated input voltage is selected, the protection relays will be delivered with digital inputs that also have the higher rated input voltage. The digital input, DI9, on the CPU module has also lower rated input voltage. The auxiliary voltages of power supply modules and the corresponding rated input voltages of digital inputs are: Power supply module PS_87H Rated input voltage of power supply 0/20/220/240 V AC or 0/25/220 V DC For further technical data of the power supply, see Table on page Low auxiliary voltage indication Rated input voltage of digital inputs DI...DI8: 0/25/220 V DC DI9: 24/48/60/0/25/220 V DC PS_87L 24/48/60 V DC DI...DI9: 24/48/60/0/25/220 V DC The relay is provided with a low auxiliary voltage indication feature. The power supply module issues an internal alarm signal when a drop in the power supply voltage is detected. The alarm signal is activated if the power supply voltage falls about 0% below the lowest rated DC input voltage of the power supply module, see the following table: Rated input voltage PS_87H Rated input voltage 0/25/ 220 V DC Rated input voltage 0/20/220/ 240 V AC PS_87L Rated input voltage 24/48/60 V DC Low indication level 99 V DC 88 V AC 2.6 V DC The indication of a low auxiliary voltage (ACFail) can be seen as an event via serial communication Overtemperature indication The REX protection relay includes an internal temperature supervision function. The CPU module issues an internal alarm signal when overtemperature has been detected inside the relay enclosure. The alarm signal will be activated once the temperature inside the relay enclosure increases approximately to +78 o C. The overtemperature indication can be seen on the HMI or as an event via serial communication. The relay will go to the IRF (internal relay fault) state. See Table , Fault indications, on page

24 REX 52 Protection Relay MRS7508-MUM Analog channels The protection relay measures the analog signals needed for protection, measuring, etc. via galvanically separated matching transformers. In addition, current sensors (Rogowski coil) and voltage dividers developed by ABB can be used with REX 52. The different versions of REX 52 are provided with the following matching transformers and sensor inputs: Version Matching transformers Sensor inputs Basic CT, CT2, CT3, CT4 - Medium CT, CT2, CT3, CT4, CT5, VT - High CT, CT2, CT3, CT4, CT5, VT, VT2, VT3, VT4 - Sensor CT4, CT5, VT RS, RS2, RS3, VD, VD2, VD3 A letter in the order number specifies whether the protection relay is equipped with basic, medium, high or sensor measuring input modules. (Refer to section Ordering information on page 6) Scaling the rated values of the protected unit for analog channels A separate scaling factor can be set for each analog channel. The factors enable differences between the ratings of the protected unit and those of the measuring device (CTs, VTs etc.) The setting value.00 means that the rated value of the protected unit is exactly the same as that of the measuring device. The scaling factor is calculated channel by channel as follows: Scaling factor = I nmd / I np, where I nmd I np Example: When scaling factors are used, it should be noted that they affect the operation accuracy of the relay. The accuracies stated in the description of each function block (in the CD-ROM Technical Descriptions of Functions) only apply with the default values of the scaling factors. For example, a high factor affects the operation of sensitive protection functions such as the directional earth fault protection. To ensure the proper operation of the function blocks, it must be checked that the analog scales (pu scales) of the phase currents I L, I L2, and I L3, and correspondingly, the analog scales of the phase-to-phase voltages U 2, U 23, and U 3 or phase-to-earth voltages U, U 2, and U 3 are identical. Rated primary current [A] of the measuring device Rated primary current [A] of the protected unit connected to the channel Rated primary current of current trafo = 500 A: I nmd = 500 A Rated current of the protected unit = 250 A: I np = 250 A Scaling factor for current channels: 500 A / 250 A =

25 MRS7508-MUM Protection Relay REX 52 The scaling factors for the analog channels can be set via the HMI of the protection relay or with the Relay Setting Tool. The HMI path for the scaling factors is: Configuration\Protected unit\il: scaling, IL2: scaling Technical data of the measuring devices The technical data of the measuring devices is set using the Relay Setting Tool or via HMI. The set values (Configuration\Meas.devices\) will affect the measurements carried out by REX 52. Values to be set for a current transformer: rated primary current ( A) of the current transformer rated secondary current (5 A, 2 A, A, 0.2 A) of the current transformer rated current (5 A, A, 0.2 A) of the current measuring input (= rated current of the matching transformer of the protection relay) amplitude correction factor ( ) of the current transformer at rated current correction parameter for the phase displacement error of the current transformer at rated current ( ) amplitude correction factor of the current transformer at a signal level of % of the rated current ( ) correction parameter for the phase displacement error of the current transformer at a signal level of % of the rated current ( ) Values to be set for a voltage transformer: rated voltage of primary voltage transformer ( kv) rated voltage of voltage input (same as the secondary rated voltage of the primary voltage transformer connected to the voltage input, 00 V, 0 V, 5 V, 20 V) amplitude correction factor of the primary voltage transformer voltage at rated voltage ( ) correction parameter for the primary transformer phase displacement error at rated voltage ( ) Values to be set for a current sensor (Rogowski coil): secondary rated voltage of the current sensor used at the preset primary rated current ( mv) primary rated current of the current sensor used ( A) amplitude correction factor of the current sensor used at rated current ( ) correction parameter for the phase displacement error of the current sensor ( ) 25

26 REX 52 Protection Relay MRS7508-MUM Values to be set for a voltage divider: division ratio of the voltage divider primary and secondary voltage ( ) rated value of primary phase-to-phase voltage ( kv) amplitude correction factor of the voltage divider ( ) correction parameter for the phase displacement error of the voltage divider ( ) Calculation of correction parameters and factors: The measurement values stated by the manufacturer of the measuring device are used for calculating the correction parameters and factors according to the following formulas: Current transformers: Amplitude error at current I n (p = error in per cent) Amplitude error at current 0.0 x I n (p = error in per cent) Phase displacement error at current I n (d = error in degrees) Phase displacement error at current 0.0 x I n (d = error in degrees) Voltage transformers: Amplitude error at voltage U n (p = error in per cent) Phase displacement error at voltage U n (d = error in degrees) Rogowski coil: Voltage divider: Amplitude correction factor = / (+ p/00) Amplitude correction factor 2 = / (+ p/00) Phase displacement error = - d Phase displacement error 2 = - d Amplitude correction factor = / (+ p/00) Phase displacement error = - d Amplitude error at the whole measuring range Amplitude correction factor (e = error in per cent) = /(+ e/00) Phase displacement error at the whole Phase displacement error = - e measuring range (e = error in degrees) Amplitude error at the whole measuring range Amplitude correction factor (e = error in per cent) = /(+ e/00) Phase displacement error at the whole Phase displacement error = - e measuring range (e = error in degrees) 26

27 MRS7508-MUM Protection Relay REX Calculated analog channels Select Io Rated frequency Digital inputs In case that no measuring devices are applied for measuring neutral current (Io), the calculated (virtual) channel Ios can be used in some of the configurations. See section Select Io for information about how to take Ios into use. Calculated Uos is also used in some of the configurations in which no measuring device is available for the residual voltage (Uo). One configuration also includes calculated main voltages (U2s, U23s, U3s), calculated from the measured phase voltages (U, U2, U3). For detailed information about in which configurations the calculated channels are used, see Table 2.- in REX 52 Technical Reference Manual, Standard Configurations (see Table 3.3.-). If the analog channel Iob will be used for protection and measuring functions in the configuration it has to be enabled in the relay. Do this by selecting Iob, 0.2/ A from HMI or the Relay Setting Tool, path Configuration\Analog scales\select Io. If the calculated Ios will be used it can be enabled from the same place by selecting Ios. In some configurations only the default setting Io, /5 A is available. The rated frequency of the protection relay can be set from from HMI or the Relay Setting Tool, path Configuration\Analog scales\rated frequency. It can be set between 50 and 60 Hz, the default value is 50 Hz. The digital inputs of the protection relay are voltage-controlled and optically isolated. For technical data of the digital inputs, see Table on page Filtering of digital inputs The filter time eliminates debounces and short disturbances on digital inputs. The filter time may be set individually for each input. Input t 0 t Filter Filtered Input Filter Time Filter Time Fig Filtering of a digital input A

28 REX 52 Protection Relay MRS7508-MUM Fig illustrates the input filtering. At the beginning, the input signal is at high state, the first low state is filtered and no input status change is detected. The second low state is longer than the set filter time, thus detected as a change and attached with the time tag t 0.When the input signal returns to high state, after the filter time, the state is accepted and attached with the time tag t. Each digital input has a filter time parameter Input # filter (Configuration\Digital inputs\input filtering), where # is the number of the input. Table Filter time parameter Parameter Values Default Input # filter ms 5 ms A risk for debounces and short disturbances on digital inputs grows if the input filter time is changed to less than the default value Inversion of digital inputs The status of digital inputs can be inverted with parameters accessible through the HMI or the Relay Setting Tool (Configuration\Digital inputs\input inversion). When inverted, the status of a digital input is TRUE () when no control voltage is applied to the terminals, and FALSE (0) when the control voltage is applied Outputs The outputs are categorized as follows: HSPO: High speed power output, single or double pole contact, for example for tripping purposes PO: Power output, single pole contact SO: Signal output, NO/NC (Normally open/normally closed) contact For detailed information about terminal connections, refer to the terminal diagrams. Technical data of the outputs is found in the section Technical data on page High-speed power output (HSPO) The high-speed power output HSPO can be connected as a double-pole output where the object to be controlled (for example a circuit breaker) is electrically connected between the two relay contacts, see the Fig below. The highspeed double-pole power output is recommended to be used for tripping purposes. 28

29 MRS7508-MUM Protection Relay REX 52 + HSPO CB - A05902 Fig High-speed double-pole power output (HSPO) The high-speed power output HSPO can also be connected as a single-pole power output where the object to be controlled (for example a circuit breaker) is electrically connected in series with the two relay contacts, see the Fig below. + HSPO Fig High-speed single-pole power output (HSPO) CB - A Single-pole power outputs (PO) The single-pole power outputs PO...3 are outputs where the object to be controlled is connected in series with two heavy-duty output relay contacts, see the Fig below. These outputs can be used for tripping purposes and for circuit breaker and disconnector control. Two singe-pole outputs may be used to obtain another double-pole output. PO CB Fig Single-pole power outputs (PO...3) - A

30 REX 52 Protection Relay MRS7508-MUM Signalling outputs (SO) The signalling relay outputs (SO and SO2) are not heavy-duty outputs and thus they cannot be used for controlling, for example, a circuit breaker. Available relay contacts are Normally Open/Normally Closed type (NO/NC), see the Fig below. These outputs can be used for alarming and other signalling purposes. NO/NC e.g. SO Fig Signalling output (SO) A Testing inputs and outputs The digital inputs and the output relays may be tested using the serial communication or the HMI. Generally, the relay has to be in the test mode before the inputs and outputs can be activated. However, output relays may be activated through the serial communication without entering the test mode. This is to enable the usage of output relays for external purposes, not part of the protection and control in the host relay. The test mode can be set with a parameter. The green READY LED indicator will be blinking, to announce that the test mode has been entered. In this state, the relay configuration is disconnected from the physical inputs so that changes on the digital inputs will not be noticed. When the test mode is deactivated, all test parameters requiring the test mode, will be reset. The IRF relay may be tested by using the HMI. The IRF relay testing always requires entering the test mode. When testing the general output relays, the user should notice, that normal operation of the relay cannot be disconnected. If an output relay is permanently activated by the configuration, it cannot be deactivated for testing. For further information, see Operator s manual (see Related documents on page 0). 30

31 MRS7508-MUM Protection Relay REX 52 Table Testing of inputs and outputs Test object Using Test mode required Remarks Digital inputs HMI Yes Physical inputs disconnected Serial communication Yes Output relays HMI Yes Normal operation still active Serial communication No IRF relay HMI Yes Serial communication Yes Trip-circuit supervision The trip-circuit supervision consists of two functional units: A current limiter including the necessary hardware elements A software-based function block, named TCS The supervision of the trip circuit is based on the constant current injection principle. By applying an external voltage over the relay s trip contacts, a constant current is forced to flow through the external trip circuit. If the resistance of the trip circuit exceeds a certain limit, for instance due to a bad contact or oxidation, the supervision function will be activated and cause a trip-circuit supervision alarm signal after an adjustable delay time. Under normal operating conditions, the applied external voltage is divided between the relay s internal circuit and the external trip circuit so that at the minimum 20 V ( V) remains over the relay s internal circuit. Should the external circuit s resistance be too high or the internal circuit s too low, for example, due to welded relay contacts, the fault is detected. Mathematically the operation condition can be expressed as: U c ( R ext + R int + R s ) I c 20 V AC/DC where: U c = operating voltage over the supervised trip circuit I c = measuring current through the trip circuit, appr..5 ma ( ma) R ext = external shunt resistance R int = internal shunt resistance, kω R s = trip coil resistance The external shunt resistance is used if the trip-circuit supervision, independent of the circuit-breaker position, is desired. If the trip-circuit supervision is required only in closed position, the external shunt resistance may be omitted. Should the external shunt resistance be used, it has to be calculated not to interfere with the functionality of the supervision or the trip coil. Too high a resistance will cause too high a voltage drop, jeopardizing the requirement of at least 20 V over the internal circuit, while a resistance too low may enable false operations of the trip coil. 3

32 REX 52 Protection Relay MRS7508-MUM The following values are recommended for the external resistor R ext : Table Values recommended for R ext Operating voltage U c Shunt resistor R ext 48 V DC.2 kω, 5 W 60 V DC 5.6 kω, 5 W 0 V DC 22 kω, 5 W 220 V DC 33 kω, 5 W X4.2 + Rint 2 Rs TCS HW SW CBPOS_open TCS blocking BS Fig TCS TCSSTATE ALARM A05906 Operating principle of the trip-circuit supervision, without an external resistor. The TCS blocking switch is set, blocking the TCS when the circuit breaker is open. X4.2 + Rint 2 Rext Rs TCS HW SW TCS TCSSTATE CBPOS_open BS TCS blocking ALARM A05907 Fig Operating principle of the trip-circuit supervision, with an external resistor. The TCS blocking switch is open, enabling trip-circuit supervision independent of circuit breaker position. If there are more auxiliary contacts available, an opening contact can be series connected with the R ext -resistor. The shunt-resistor circuit is opened when the CB is closed. Therefore the supervision of the auxiliary contact is also possible. 32

33 MRS7508-MUM Protection Relay REX Self-supervision In order to avoid false operations due to relay faults and to maximize the overall availability of the protection, a set of autodiagnostic circuit arrangements have been implemented in the relay modules. The different memory circuits, that is, the RAM and the non-volatile memories, are continuously tested with different methods. The microcontroller and the program execution are supervised by a watchdog once every 00 ms. The selector, the A/D converter and other measuring input electronics are tested by checking a very accurate reference voltage once a minute. This is to ensure that a measured signal is real and not caused by a fault or disturbance in some input circuit, all to avoid false output signals. Setting values are tested with the help of a checksum. Furthermore, critical setting values are always checked to ensure that the values used are within the maximum and minimum limits. The internal supply voltages from the power supply module are tested once a minute by measuring the voltages, +24 V, +5 V and -5 V. The trip output paths, the output amplifiers and the output relay coils are checked once a minute by injecting a 50 µs voltage pulse into the circuit and checking that current flows through the output relay coils. Both short-circuits and open coils are detected, since the rise time of the voltage pulse is measured. Table 5..- Self-supervision functions Supervised object Supervision method Execution frequency RAM memories Write and read of all memory 40 B / 200 ms locations Nonvolatile memories Checksum When data is fetched Microcontroller and program execution Internal watchdog 00 ms A/D converter, multiplexer and Reference voltage min amplifiers Setting values Checksum, correct values min HMI (display) Visual inspection On connection of supply voltage Power supply module Measurement of supply voltages min Output amplifiers and relay Feedback from the relay coils min coils When the self-supervision detects a fault, different measures are taken depending on the severity of the fault. If the fault is fatal, the microcontroller tries to get the system to work by restarting ten times. If this attempt is not successful, a signal about the internal relay fault (IRF) is linked to the output relay. Provided that the unit is operating normally, the information about the fault is sent as an event IRF activated (E3) over the serial communication and the green READY LED on the front panel starts blinking. An indication about the character of the fault is also shown as a textual message on the display. 33

34 REX 52 Protection Relay MRS7508-MUM 5... Fault indication If the fault is considered too dangerous to maintain normal protection, an inoperative IRF state is entered and no output relay operations are allowed. On the other hand if, for example, one output relay is found faulty and the others healthy, normal operations targeted to a healthy relay are allowed. Even a total breakdown of the relay, for example, on loss of power supply, will be detected as the IRF relay operates in a fail-safe mode, causing a signal when the relay drops off. The serial communication will also indicate loss of contact to the module. When the relay is in the IRF state, it tries to recover by restarting every five minutes. As long as the fault remains, the relay continues to perform internal tests. Should the fault prove to be of temporary nature, normal operation is recovered after restart and an event IRF reset (E30) is sent over the serial communication. The self-supervision signal output operates on the closed circuit principle. Under normal conditions the output relay is energized and the contact gap 3-5 is closed. Should the auxiliary power supply fail or an internal fault be detected, the contact gap 3-5 is opened. Normal condition 5 4 Fault condition 5 4 IRF IRF 3 3 A05908 Fig Self-supervision output (IRF) When a fault has been detected, the green READY LED indicator starts blinking, a fault indication text is displayed on the HMI and an event IRF activated (E3) is generated over serial communication. 34

35 MRS7508-MUM Protection Relay REX Fault indication texts The table below shows the different fault indication texts that may appear, the corresponding fault codes and the actions that should be taken. The fault code is only used for remote control systems connected to the serial communication. Table Fault indications Fault indication INTERNAL FAULT Relay HSPO INTERNAL FAULT Relay PO INTERNAL FAULT Relay PO2 INTERNAL FAULT Relay PO3 INTERNAL FAULT Relay SO INTERNAL FAULT Relay SO2 INTERNAL FAULT Relay control INTERNAL FAULT Relay test INTERNAL FAULT NOV error INTERNAL FAULT EEPROM error INTERNAL FAULT RAM error INTERNAL FAULT IRF error (test) INTERNAL FAULT HMI error INTERNAL FAULT Overtemperature INTERNAL FAULT Voltage low 24V INTERNAL FAULT Volt. high +5V INTERNAL FAULT Volt. high -5V INTERNAL FAULT A/D conversion INTERNAL FAULT Start-up INTERNAL FAULT Unspecified Fault code Reason/Action Protection operative, but the faulty output relay cannot be controlled 7 Protection operative, but the faulty output relay cannot be controlled 8 Protection operative, but the faulty output relay cannot be controlled 9 Protection operative, but the faulty output relay cannot be controlled 5 Protection operative, but the faulty output relay cannot be controlled 6 Protection operative, but the faulty output relay cannot be controlled 20 Protection inoperative. An attempted relay control operation failed. 2 Protection inoperative. Two or more relays were found faulty during test. 30 Protection operative. Nonvolatile memory error. The corrupted data cannot be used. May be solved by restoring the factory settings. 40 Protection inoperative 50 Protection inoperative 60 Protection operative 70 Protection operative. The fault indication may not be seen on the HMI during the fault. 80 Protection operative. The relay has detected an excessive temperature. May be due to an ambient temperature above the specified operating limit or an internal fault. 3 Protection operative. Output relays do not operate within specified limits. 203 Protection inoperative 223 Protection inoperative 253 Protection inoperative - Protection inoperative. No communication started, menu navigation disabled. 255 Protection operative or inoperative. The fault location cannot be determined. 35

36 REX 52 Protection Relay MRS7508-MUM Serial communication The protection relay has two serial communication ports, one on the front panel and the other on the rear panel. The connector located on the front panel is a standard ABB optical connector that is intended to be used for setting the parameters of the protection relay. During the transmission of the parameters, an interface cable is connected between the relay and the standard RS-232 interface of a PC, running the Relay Setting Tool. On the rear panel, there is a fibre-optic interface used to connect the protection relay to a distribution automation system via SPA, LON, IEC , Modbus or DNP 3.0 bus. There is also an isolated RS-485 connection (twisted pair) available for SPA, Modbus and DNP 3.0 communication in connector X3.:9,0. For the location of the RS-485 connection on the rear panel, see Terminal connections on page 57. The connection is marked with texts Data A and Data B on the panel. The following table describes the combinations of different communication protocols and the physical interfaces that can be used at the same time (X = in use). Table Protocol combinations and physical interfaces Protocol Rear port (Optical) Rear port (RS-485) Front connector (SPA only) SPA X X SPA X X LON X X IEC_03 X X Modbus X X Modbus X X DNP 3.0 X X DNP 3.0 X X Optical communication port on the rear panel The fibre-optic interface on the rear panel contains two optical connectors, Tx (X3.2) and Rx (X3.3). The connectors are used for interfacing the unit to an optical fibre bus using either plastic fibre or glass fibre cables. See also Fig on page 38 for more information about the plastic and glass fibre cables. The incoming optical fibre is connected to the receiver, input Rx, and the outgoing optical fibre to the transmitter, output Tx. Special attention should be paid when handling, mounting, and connecting fibre-optic cables. For additional information, see the document 34 SPA 3 EN Plastic-core fibre-optic cables. Features and instructions for mounting. The communication port supports five different protocols, SPA, LON, IEC , Modbus and DNP 3.0. The SPA, IEC_03, Modbus and DNP 3.0 protocols are always supported while LON is not available in all the relay variants. The relay does not automatically recognize which bus it is connected to and therefore the protocol must be set manually through the HMI or the Relay Setting Tool (Main menu\configuration\communication\rear port). For rear port options, see Table

37 MRS7508-MUM Protection Relay REX Isolated RS-485 connection on the rear panel The RS-485 port is used for connecting the unit to the communication bus by using twisted pair cable. When the shielded twisted pair cable is used (recommended), the shield can be connected to the earthing connector which is located on the rear panel (see Terminal connections on page 57). The communication port can be used with three different protocols: SPA, Modbus and DNP 3.0. The user must set the selected protocol manually by using the HMI or the Relay Setting Tool (Main menu\configuration\communication\rear port). For options, see the table Table Table Rear port options Option SPA LON IEC_03 Modbus SPA - RS485 Modbus - RS485 DNP RS485 DNP 3.0 Rear port optical optical optical optical RS-485 RS-485 RS-485 optical Front panel optical connection for a PC The front connector is standardized for ABB relay products and requires an optocable (ABB art. No MKC ). The connector supports only the SPA bus protocol, and is connected to the RS-232 port of a standard PC. By using an optical connector, the PC is isolated galvanically from the protection relay and disturbances are minimized. Parameters for the serial communication, SPA address, Baud rate and Slave status, can be changed manually in the HMI. To ensure fluent communication flow, it is recommended to use 9.6 kbps baud rate The service pin located on the rear panel SPA bus The service pin located above the connector X3.2 is used only in systems communicating over the LON bus. The service pin is used during the installation process or in fault detection. When the service pin is pressed, the neuron_id is sent to the LON bus. The SPA bus protocol uses an asynchronous serial communication protocol ( start bit, 7 data bits + even parity, stop bit). Adjustable parameters are Baud rate (default 9,6 kbps) and SPA address (slave number). The communication parameters for the front and the rear communication ports can be set individually. The SPA bus protocol is sending events using event mask ( V0 parameter of each function block). The SPA event buffer stores the first 50 events. 37

38 O O AUX T 2 S 2 R POWE S INT S 0 R SPA-ZC 22 S S 5B0M Ser. No 4BM RS 00 UAUX 3B2M SPA /25/220 V DC 2B3M OPTICAL /20/230/240 V AC B4M MASTE /48/60 V DC SLAV 00 + _ SERIAL SERIAL L N P SPA / RS 485 RS READY START TRIP REX 52 O O AUX T 2 S 2 R POWE S INT S 0 R SPA-ZC 22 S S 5B0M Ser. No 4BM RS 00 UAUX 3B2M SPA /25/220 V DC 2B3M OPTICAL /20/230/240 V AC B4M MASTE /48/60 V DC SLAV 00 + _ SERIAL SERIAL L N P SPA / RS 485 RS FEEDER PROTECTION READY START TRIP REX 52 O O AUX T 2 S 2 R POWE S INT S 0 R SPA-ZC 22 S S 5B0M Ser. No 4BM RS 00 UAUX 3B2M SPA /25/220 V DC 2B3M OPTICAL /20/230/240 V AC B4M MASTE /48/60 V DC SLAV 00 + _ SERIAL SERIAL L N P SPA / RS 485 RS SPAC 33 C I O CB OK 2 kv AROFF Uaux = Vdc/ac Ion = /5 A (Io) MRS xxxxxx fn = 50 Hz Un = 00/0 V (U) 9850 In = /5 A (I) Uon = 00/0 V (Uo) 9509 FEEDER PROTECTION REX 52 FEEDER PROTECTION REX 52 FEEDER PROTECTION REX 52 FEEDER PROTECTION REX 52 READY START TRIP READY START TRIP READY START TRIP READY START TRIP REX 52 Protection Relay MRS7508-MUM MicroSCADA COM-port (RS 232) SPA-bus COM-port (RS 232) Protocol X SPA-ZC22 Optical SPA-bus SPA-ZC2 RER 03 FEEDER PROTECTION REF 54 REX 52 REX 52 SPACOM REF 54_ Fig Example of a SPA-based substation automation system In the case of longer transmission distance, for example between MicroSCADA system and a substation, the system configuration presented in Fig is recommended. MicroSCADA A05909 RS232C SPA-ZC22 SPA-ZC22 SPA bus, glass fibre optics SPA bus (loop), plastic fibre optics REX 52 REX 52 REX 52 REX 52 Maximum length with plastic fibre: 20 m Maximum length with glass fibre: 000 m Fig Example of a SPA-based substation automation system with a longer transmission distance A