Protection Relay REX 521 Technical Reference Manual, General
1MRS751108-MUM Issued: Version: 27.06.2001 H/29.09.2006 Protection Relay REX 521 Technical Reference Manual, General Contents 1. About this manual ...................................................................9 1.1. 1.2. 1.3. 1.4. This manual ................................................................................9 Use of symbols ...........................................................................9 Related documents ..................................................................
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General 5.1.9. Testing inputs and outputs ............................................. 30 5.1.10. Trip-circuit supervision ................................................. 31 5.1.11. Self-supervision ........................................................... 33 5.1.11.1. Fault indication ............................................. 34 5.1.11.2. Fault indication texts .................................... 35 5.1.12.
1MRS751108-MUM Protection Relay REX 521 Technical Reference Manual, General 8. Revision history of REX 521 .................................................63 8.1. Revision identification ...............................................................63 8.2. Changes and additions to earlier released revision E ..............63 8.3. Configuration, setting, and SA system tools .............................63 9. Appendix A: IEC 60870-5-103 bus .......................................65 9.1. 9.2. 9.3. 9.4.
1MRS751108-MUM Protection Relay REX 521 Technical Reference Manual, General 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.
1MRS751108-MUM Protection Relay REX 521 Technical Reference Manual, General 1. About this manual 1.1. This manual This document provides a general description of the protection relay REX 521 Revision G. For more information about the earlier revisions, refer to section “Revision history of REX 521” on page 63. For detailed information about the separate functions, see REX 521 Technical Reference Manual, Standard Configurations (see “Related documents” on page 10). 1.2.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General 1.3. Related documents Manuals for REX 521 • • • • • Technical Reference Manual, Standard Configurations Operator’s Manual Installation Manual Technical Descriptions of Functions (CD-ROM) Modbus Remote Communication Protocol for REX 521, Technical Description • DNP 3.
1MRS751108-MUM Protection Relay REX 521 Technical Reference Manual, General 2. 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.
1MRS751108-MUM Protection Relay REX 521 Technical Reference Manual, General 3. Introduction 3.1. General The protection relay REX 521 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.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General 3.2. Application • 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. Table 3.2.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General Table 3.2.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General 3.3. Hardware versions Table 3.3.-1 Hardware versions of REX 521 Relay type Sensor REX521xSxxx High REX521xHxxx Transformers • Current transformers 1/5 A • Current transformers 0.
1MRS751108-MUM Protection Relay REX 521 Technical Reference Manual, General 4. 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.
1MRS751108-MUM Protection Relay REX 521 Technical Reference Manual, General 5. Technical description 5.1. Functional description 5.1.1. 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 36. 5.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General 5.1.1.3. Relay Setting Tool view To improve usability, a REX 521 specific pull-down menu, View, with three views has been created to the Relay Setting Tool. A051899 Fig. 5.1.1.3.-1 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.
1MRS751108-MUM Protection Relay REX 521 Technical Reference Manual, General A0501900 Fig. 5.1.1.4.-1 Graphical I/O Setting Tool 5.1.1.5. 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.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General 5.1.2. Non-volatile memory 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.
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General 5.1.4.1. Power supply versions There are two basic versions of power supply modules available for REX 521 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 521 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 61).
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General 5.1.6. 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 521.
1MRS751108-MUM Protection Relay REX 521 Technical Reference Manual, General 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\IL1: scaling, IL2: scaling... 5.1.6.2. 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.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General Values to be set for a voltage divider: • • • • division ratio of the voltage divider primary and secondary voltage (100...20000) rated value of primary phase-to-phase voltage (0.100...440.000 kV) amplitude correction factor of the voltage divider (0.9000...1.1000) correction parameter for the phase displacement error of the voltage divider (-1.0000°...1.
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General 5.1.6.3. Calculated analog channels 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).
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General Fig. 5.1.7.1.-1 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 t0.When the input signal returns to high state, after the filter time, the state is accepted and attached with the time tag t1.
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General + HSPO1 CB A051902 Fig. 5.1.8.1.-1 High-speed double-pole power output (HSPO) The high-speed power output HSPO1 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. 5.1.8.1.-2 below. + HSPO1 CB A051903 Fig. 5.1.8.1.-2 High-speed single-pole power output (HSPO) 5.1.8.2.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General 5.1.8.3. Signalling outputs (SO) The signalling relay outputs (SO1 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. 5.1.8.3.1 below. These outputs can be used for alarming and other signalling purposes. NO/NC e.g. SO1 A051905 Fig. 5.1.8.3.-1 Signalling output (SO) 5.1.9.
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General Table 5.1.9-1 Testing of inputs and outputs Test object Using Digital inputs HMI Serial communication HMI Serial communication HMI Serial communication Output relays IRF relay 5.1.10.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General The following values are recommended for the external resistor Rext: Table 5.1.10-1 Values recommended for Rext Operating voltage Uc Shunt resistor Rext 48 V DC 1.2 kΩ, 5 W 60 V DC 5.6 kΩ, 5 W 110 V DC 22 kΩ, 5 W 220 V DC 33 kΩ, 5 W X4.2 + Rint 1 Rs 2 3 4 TCS - HW SW TCS1 TCSSTATE CBPOS_open TCS blocking ALARM BS A051906 Fig. 5.1.10.
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General 5.1.11. 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.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General 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.
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General 5.1.11.2. 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 5.1.11.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General 5.1.12. 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.
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General 5.1.12.2. 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).
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General MicroSCADA COM-port (RS 232) SPA-bus O O 1 T 3 AUX INT POWE 1 4 S 2 5 1 3 2 4 SPA-ZC 22 R Ser.
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General 5.1.12.6. LON The protection relay is able to interface to the substation automation system with the LON communication protocol. The LON communication between REX 521 and the host device, for example MicroSCADA, is based on LAG (Lon Application Guideline) version 1.4. The REX 521 LON communication includes vertical communication of process data and parameter data between the protection relay and the host device.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General The LAG 1.4 default communication settings may be loaded by selecting Execute from the HMI (Configuration\Communication\Comm.settings\LON \Load def config.). This operation blanks the internal EEPROM and boots the Neuron chip. Thereafter, the default communication settings are loaded and stored into the Neuron chip. This operation takes approximately 15 seconds according to LAG 1.4.
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General The physical bus topology is star-based. A star-coupler unit, for example RER 125, is needed for connecting the REX 521 unit to a control system.The line idle state of the fibre-optic interface is configurable (“light on” and “light off”) with a parameter Tx mode. For more information about the IEC 60870-5-103 bus, see “Appendix A: IEC 60870-5-103 bus” on page 65.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General The adjustable parameters via HMI for Modbus communication in REX 521 are CRC Order, Modbus Mode, Unit Address, Baud rate, No of stop bits, No of data bits, End of frame TO, and Parity. When using the RTU mode, every time the bit rate parameter (Baud rate) is reconfigured, that is, the value is changed, the software of REX 521 also recalculates the default value for the timeout parameter (End of frame TO).
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General 5.1.12.10. IEC 61850 communication by using SPA-ZC 402 REX 521 can communicate with the IEC 61850 protocol by connecting a SPA-ZC 402 SPA/Ethernet adapter to the rear optical connection. The SPA-ZC 402 SPA/Ethernet adapter also offers the possibility to access the REX 521 relay with the SPA protocol over TCP/IP using the same Ethernet link.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General 5.1.13. Time synchronization The time synchronization (Configuration\Time) of the protection relay can be given from different sources: 1. The time can always be given manually from the front panel. 2. The time synchronization can also be given externally. The master parameter for external synchronization source selection is called Sync. source. This parameter can have two different states: • “Net Messages” state • “X3.1.
1MRS751108-MUM Protection Relay REX 521 Technical Reference Manual, General 5.1.14. Display panel (HMI) The front panel of the relay includes: • • • • • A 6 x 16 character LCD Three protection indication LEDs Eight alarm LEDs Arrow buttons for menu navigation Optically isolated serial communication port Additional features of the display: • Contrast adjustment with temperature compensation • Backlight control 5.1.15.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General After an auxiliary supply break, the state of the alarm LEDs is restored to the same state as before the break. This means that alarms will be seen even if the alarm went off during the break and regardless of the mode. The alarms can be acknowledged (cleared) only from the main view by pressing the [C] button for 2 seconds 5.1.16.1.
1MRS751108-MUM Protection Relay REX 521 Technical Reference Manual, General When writing signal names on the label by hand 1. Use the pre-printed transparency. 2. Write the names on the transparency with permanent pen or by typewriter. 3. Put the label in the pocket on the front panel of REX 521. When writing signal names on the label by using computer 1. Select a template for the label.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General 5.2. Design description 5.2.1. Technical data Table 5.2.1-1 Energizing inputs Rated frequency 50.0/60.0 Hz Current inputs Rated current Thermal withstand capability 0,2 A/1 A/5 A continuously 1.5 A/4 A/20 A for 1 s 20 A/100 A/500 A dynamic current withstand, half-wave 50 A/250 A/1250 A value Voltage inputs Sensor inputs Table 5.2.
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General Table 5.2.1-5 Power outputs Max. system voltage 250 V AC/DC Continuous carry 5A Make and carry for 0.5 s 30 A Make and carry for 3 s 15 A 5 A/3 A/1 A Breaking capacity when control circuit time constant L/R <40 ms, at 48/110/220 V DC Minimum contact load 100 mA, 24 V AC/DC (2.4 VA) TCS (Trip-circuit Control voltage supervision) range 20…265 V AC/DC Current drain through the supervision circuit approx. 1.5 mA (0.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General Table 5.2.
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General Table 5.2.1-9 Data communication (Continued) Modbus protocol baud rates DNP 3.0 protocol LON protocol 0.6/1.2/2.4/4.8/9.6/19.2 kbps data bits 7/8 (ASCII/RTU) parity no parity/odd/even stop bits 1/2 Modbus modes ASCII, RTU baud rates 0.3/0.6/1.2/2.4/4.8/9.6/19.2 kbps data bits 8 parity no parity/odd/even stop bits 1/2 bit rates 78.0 kbps/1.25 Mbps Table 5.2.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General 5.2.2. Terminal diagram of REX 521: Basic A + Q0 L1 L3 0 N *) + ACFail X1.1 Mains - TempAlarm P1 L1 - L3 S1 1 2 5 4 IRF S2 P2 I X4.1 3 8 7 S1 12 11 10 9 8 7 6 5 4 3 2 1 S2 1A 5A CT4 I0 1A 5A CT3 IL3 1A 5A CT2 IL2 1A 5A CT1 IL1 SO1 6 10 11 SO2 9 12 13 PO1 14 15 PO2 17 18 + PO3 X4.2 4 3 2 **) HSPO1 TCS1 X4.2 - 5 6 1 DI1 7 DI2 8 9 SERIAL BUS + X3.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General 5.2.3. Terminal diagram of REX 521: Medium A + Q0 L1 L3 0 N *) dn da + ACFail X1.1 Mains Source - TempAlarm P1 L1 - L3 S1 18 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 S1 S2 1 2 5 4 IRF S2 P2 I X4.1 3 100V VT1 U0 0,2A 1A CT5 I0B 1A 5A CT4 I0 1A 5A CT3 IL3 1A 5A CT2 IL2 1A 5A CT1 IL1 8 7 SO1 6 10 11 SO2 9 12 13 PO1 14 15 PO2 17 18 + PO3 X4.2 4 3 2 **) HSPO1 TCS1 X4.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General 5.2.4. Terminal diagram of REX 521: High (excluding H08 and H09) A + Q0 L1 L3 0 - N n *) a dn da + X1.1 27 P1 L1 L3 25 24 S1 22 21 S2 P2 19 18 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 S1 S2 ACFail VT4 100V VT3 100V U31**) 100V U 100V VT1 U0 0,2A 1A CT5 I0B 1A 5A CT4 I0 1A 5A CT3 IL3 1A 5A CT2 IL2 1A 5A CT1 IL1 - TempAlarm U23 VT2 Mains I X4.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General 5.2.4.1. Terminal diagram of H08 and H09 configurations A + Q0 L1 L3 0 - N n *) a dn da + X1.1 27 P1 L1 L3 25 24 S1 22 21 S2 P2 19 18 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 S1 S2 ACFail VT4 100V VT3 100V U3 U2 100V VT2 U1 100V VT1 U0 0,2A 1A CT5 I0B 1A 5A CT4 I0 1A 5A CT3 IL3 1A 5A CT2 IL2 1A 5A CT1 IL1 Mains - TempAlarm I X4.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General 5.2.5. Terminal diagram of REX 521: Sensor + ACFail X1.1 27 25 24 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Voltage input, U3 X2.1 Voltage input, U2 X2.2 - 1 2 5 4 IRF 22 21 19 18 Mains TempAlarm X4.
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General 5.2.6. Terminal connections X1 X3.1 X4.1 27 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 26 1 2 3 4 5 6 7 8 9 10 RS-485 Data A Data B 25 24 23 22 21 20 19 18 17 Service pin1 16 15 14 X4.2 13 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Tx X3.2 12 Rx X3.3 10 11 9 8 7 6 5 CE 4 3 Made in Finland 2 1 A051921 Rear view of REX 521 Basic1 Fig. 5.2.6.-1 X4.1 X1 X3.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General X1 X3.1 X4.1 27 26 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 Data A RS-485 10 10 Data B 11 12 13 14 15 16 17 Service pin1 18 25 24 23 22 21 20 19 18 17 16 15 14 X4.2 13 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Tx X3.2 12 Rx X3.3 10 11 9 8 7 6 5 CE 4 3 Made in Finland 2 1 RearViewMedium Fig. 5.2.6.-3 Rear view of REX 521 X3.1 X4.1 A051923 High1 X1 27 1 1 2 2 X2.1 3 3 1 4 4 5 5 2 6 6 7 7 X2.
1MRS751108-MUM Protection Relay REX 521 Technical Reference Manual, General 6. Service When the protection relay is used under the conditions specified in section 5.2.1. Technical data, it is practically maintenance-free. The relay electronics include no parts or components subject to abnormal physical or electrical wear under normal operating conditions.
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General 7. Ordering information When ordering REX 521 protection relays, specify the following: • • • • Order number Quantity Additional language Optional Chinese front panel (1MRS121025) Each protection relay has a specific order number that identifies the protection relay type as well as the hardware and the software as described in Fig. 7.-1 below.
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General 8. Revision history of REX 521 8.1. Revision identification The main releases of REX 521 products are differentiated with the revision and configuration revision letters in the order number (see “Ordering information” on page 61). Table 8.1.
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General 9. Appendix A: IEC 60870-5-103 bus 9.1. Functions supported by REX 521 Function 9.2.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General 9.3.
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General 9.5. Default mappings Explanations to Table 9.5.-1: St Status A B According to the IEC 60870-5-103 standard According to “Digitale Stationsleittechnik - Ergänze Empfehlungen zur Anwendung in Verteilnetzstationen” Private definition Function type Note! If stated as a, the signal type Ftyp corresponds with the unit function type. Unit function type may be adjusted via the Function type parameter.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General Table 9.5.
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General Table 9.5.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General Table 9.5.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General Table 9.5.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General Example If set No 11 is used, the ASDU octets will look like in the following table: 9 5 COT ADR 135 140 IL1 IL2 IL3 Io Uo 72 TypeId VSQ=Number of data Function type Information number Data1 Data2 Data3 Data4 Data5
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General 10. Appendix B: Parameters visible only in the relay Input 1 state Input 2 state Input 3 state Input 4 state Input 5 state Input 6 state Input 7 state Input 8 state Input 9 state Input states Output states Test mode Activate IRF Software reset Factory settings Send Neuron ID Load def config.
1MRS751108-MUM REX 521 Protection Relay Technical Reference Manual, General 11. Appendix C: Parameters which cause reset Rated frequency Select Io Voltage combine IL1: scaling IL2: scaling IL3: scaling Io: scaling Iob: scaling Uo: scaling U1: scaling U2: scaling U3: scaling U12: scaling U23: scaling U31: scaling U12b: scaling Second. current Primary current Current terminal Corr. factor 1 Displ. error 1 Corr. factor 2 Displ. error 2 Second. current Primary current Current terminal Corr. factor 1 Displ.
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General Corr. factor 1 Displ. error 1 Corr. factor 2 Displ. error 2 Second. voltage Primary voltage Corr. factor Displ. error Second. voltage Primary voltage Corr. factor Displ. error Second. voltage Primary voltage Corr. factor Displ. error Second. voltage Primary voltage Corr. factor Displ. error Output voltage Rated current Corr. factor Displ. error Output voltage Rated current Corr. factor Displ.
1MRS751108-MUM Protection Relay REX 521 Technical Reference Manual, General 12.
1MRS751108-MUM Protection Relay REX 521 Technical Reference Manual, General 13.
1MRS751108-MUM Protection Relay REX 521 Technical Reference Manual, General 14. Index A Alarm LEDs .............................................................................................. 45 Activating ........................................................................................... 46 Clearing a certain LED ....................................................................... 46 Reading actual state ............................................................................
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General H Hardware versions .................................................................................... 16 HMI .......................................................................................................... 45 I Internal power supply ............................................................................... 22 Internal relay fault ..................................................................................
1MRS751108-MUM Protection Relay REX 521 Technical Reference Manual, General R Rated values .............................................................................................. 24 Real-time clock ......................................................................................... 22 Rear port options ...................................................................................... 37 Relay parameters .....................................................................................
REX 521 Protection Relay 1MRS751108-MUM Technical Reference Manual, General V Voltage divider values .............................................................................. 26 Voltage transformer values ......................................................................
1MRS751108-MUM EN 09.2006 ABB Oy Distribution Automation P.O. Box 699 FI-65101 Vaasa FINLAND Tel. +358 10 22 11 Fax. +358 10 224 1094 www.abb.
