ABB REX 521 Use and care manual

Industrial IT enabled products from ABB are the building blocks for greater
productivity, featuring all the tools necessary for lifecycle product support in
consistent electronic form.
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Issued: 27.6.2001
Version: D/24.11.2003
We reserve the right to change data without prior notice.
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Technical Reference Manual, General
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2.1. General .........................................................................................7
2.2. Application .....................................................................................8
2.3. Hardware versions ........................................................................8
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4.1. Functional description .................................................................10
4.1.1. Parametrization ................................................................10
4.1.1.1. Local parametrization .........................................10
4.1.1.2. External parametrization ....................................10
4.1.1.3. Relay Setting Tool view ......................................11
4.1.1.4. Graphical I/O Setting Tool ..................................12
4.1.1.5. Factory settings ..................................................12
4.1.2. Non-volatile memory ........................................................13
4.1.3. Real-time clock ................................................................13
4.1.4. Auxiliary voltage ...............................................................14
4.1.4.1. Power supply versions .......................................14
4.1.4.2. Low auxiliary voltage indication ..........................14
4.1.5. Overtemperature indication ..............................................15
4.1.6. Analogue channels ..........................................................15
4.1.6.1. Scaling the rated values of the protected unit for
analogue channels 15
4.1.6.2. Technical data of the measuring devices ...........16
4.1.7. Digital inputs ....................................................................18
4.1.7.1. Filtering of digital inputs .....................................18
4.1.7.2. Inversion of digital inputs ....................................19
4.1.8. Outputs ............................................................................19
4.1.8.1. High-speed power output (HSPO) .....................19
4.1.8.2. Single-pole power outputs (PO) .........................20
4.1.8.3. Signalling outputs (SO) ......................................20
4.1.9. Testing inputs and outputs ...............................................21
4.1.10.Trip-circuit supervision .....................................................21
4.1.11.Self-supervision ...............................................................23
4.1.11.1.Fault indication ...................................................24
4.1.11.2.Fault indication texts ..........................................25
4.1.12.Serial communication .......................................................26
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Technical Reference Manual, General
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4.1.12.1.Optical communication port on the rear panel ...26
4.1.12.2.Isolated RS-485 connection on the rear panel ..27
4.1.12.3.Front panel optical connection for a PC .............27
4.1.12.4.The service pin located on the rear panel ..........27
4.1.12.5.SPA bus .............................................................27
4.1.12.6.LON bus ............................................................29
4.1.12.7.IEC 60870-5-103 bus ........................................31
4.1.12.8.Modbus bus .......................................................31
4.1.13.Time synchronization .......................................................32
4.1.14.Display panel (HMI) .........................................................33
4.1.15.Indication LEDs ...............................................................34
4.1.16. Alarm LEDs ....................................................................34
4.1.16.1.Special features of alarm LEDs .........................34
4.1.16.2.Writing signal names on alarm LED label ..........35
4.2. Design description ......................................................................37
4.2.1. Technical data ........................................................37
4.2.2. Terminal diagram of REX 521: Basic ...............................41
4.2.3. Terminal diagram of REX 521: Medium ...........................42
4.2.4. Terminal diagram of REX 521: High ................................43
4.2.5. Terminal diagram of REX 521: Sensor ............................44
4.2.6. Terminal connections ......................................................45
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7.1. Revision identification .................................................................49
7.2. Changes and additions to earlier released revision B ................49
7.3. Configuration, setting, and SA system tools ...............................50
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10.1.Functions supported by REX 521 ..............................................55
10.2.General principle of application data mapping ...........................55
10.3.Principle of the protection functions mapping ............................56
10.4.Class 2 data ...............................................................................56
10.5.Default mappings .......................................................................57
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Technical Reference Manual, General
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Version D/24.11.2003
-Changes and/or new entries in tables “Hardware versions of REX 521“, “Power outputs“, “Data
communication”, “Display language codes”, and “Class 1 data signals”.
-Changes in chapters “Introduction”, “External parametrization”, “Scaling of the rated values of the
protected unit for analogue channels”, “Technical data of the measuring devices”, “Trip-circuit
supervision”, “Serial communication”, “Ordering information”, “Revision identification”, “Changes
and additions to earlier released revision”, “Configuration, setting, and SA system tools”, References”,
“Class 2 data”, “Appendix B: Parameters visible only in the relay”, and “Appendix C: Parameters
which cause reset“.
-New chapters: “Graphical I/O Setting Tool“, “Factory settings“, “Modbus bus“, “Isolated RS-485
connection on the rear panel“, and “Alarm LEDs”.
-Changes in figures “REX 521 protection relay”, ”Block_Basic”, “Block_Medium”, “Block_High”,
“Highsensor”, “RearViewBasic”, “RearViewMedium”, “RearViewHigh”, “RearViewSensor”, and
“OrderNo”.
-New figures: “Modbus_syst”.
-TCS changed to TCS1.
-3I MCS changed to MCS 3I.
-3U MCS changed to MCS 3U.

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1MRS 751108-MUM
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Technical Reference Manual, General
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Dangerous voltages can occur on the connectors, even though the
auxiliary voltage is disconnected
National and local electrical safety regulations must always be
followed
The device contains components that are sensitive to electrostatic
discharge
The frame of the device has to be carefully earthed
Only a competent electrician is allowed to carry out the electrical
installation
Non-observance can result in death, personal injury or substantial
property damage
Breaking the sealing tape on the rear panel of the device will result in
loss of warranty and a proper operation will no longer be guaranteed
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1MRS 751108-MUM 3URWHFWLRQ5HOD\
Technical Reference Manual, General
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This document provides a general description of the protection relay REX 521
Revision C. For more information about the earlier revisions, refer to section
“Revision history of REX 521”on page 49.
For detailed information about the separate functions, refer to 5(;7HFKQLFDO
5HIHUHQFH0DQXDO6WDQGDUG&RQILJXUDWLRQV (see “References”on page 51).
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The protection relay REX 521 is designed for protection, control, measuring and
supervisioninmediumvoltagenetworks.Typicalapplicationsincludeincomingand
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 HMI1(human-
machine interface) including an LCD (liquid chrystal 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 521 is part of the substation automation concept for Distribution
Automation and extends the functionality and flexibility of the concept further.
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1. HMI is referred to as MMI (man-machine interface) in the relay and in the Relay
Setting Tool.

8
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Technical Reference Manual, General
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The REX 521 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.
Several standard configurations are available for the protection relay. For more
information, refer to 5(;7HFKQLFDO5HIHUHQFH0DQXDO6WDQGDUG
&RQILJXUDWLRQV (see “References”on page 51).
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Transformers
•Currenttransformers1/5A 4441
• Current transformers 0.2/1 A 1 1 1
• Voltage transformers 100 V 1 4 1
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• Current sensor inputs 3
• Voltage sensor inputs 3
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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)
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PS_87H (DItresh.=80 Vdc)
PS_87L (DItresh.=18 Vdc)
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2 x 16 character display
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1MRS 751108-MUM 3URWHFWLRQ5HOD\
Technical Reference Manual, General
5(;
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If the environmental conditions differ from those specified in section “Technical
data”on page 37, as to temperature and humidity, or if the environmental conditions
aroundthe protection relay containschemically active gases ordust, therelay should
be visually inspectedin association withthe secondarytesting. The visualinspection
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 47.
Protection relays are measuring instruments and should be handled with
care and protected against moisture and mechanical stress, especially
during transport.
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1MRS 751108-MUM
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Technical Reference Manual, General
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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 26.
 /RFDOSDUDPHWUL]DWLRQ
The parameter to be changed is entered by navigating in the menu structure. For
detailed instructions, refer to 2SHUDWRU¶V0DQXDO (see “References”on page 51).
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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 views relating to parametrization and settings, is the
same as the menu structure of the protection relay1. The use of the tool is instructed
in 7RROVIRU5HOD\VDQG7HU LQDOV8VHU¶V*XLGH (see “References”on page 51).
1. A few parameters are visible only in the relay, see the list on page 63.