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Communication solutions for power utilities 

UNIVERSAL TELEPROTECTION TPU-1 
INSTALLATION AND COMMISSIONING MANUAL Web version TPU-1R - Rev. 5.9  (May 2018) 

6/69 

1 

MECHANICAL CHARACTERISTICS 

The  TPU-1  terminal  is  made 

up  of  a  19”  shelf  that  is  3  standard  units  (s.u.)  in  height, 

prepared for rack mounting. 

Figure 1 shows the general dimensions of the shelf as well as the position of the fastening 

holes. As can be seen in the figure, the shelf has one ventilation grid. 

 

Figure 1

   

General dimensions of the TPU-1 shelf 

The input and output of signals is carried out by means of the plug-in connectors located at 

the  rear  of  the  shelf.  If  one  wishes  the  external  connections  to  be  carried  out  through  a 

cabinet-mounting terminal block, it can be supplied on request, together with the necessary 

cables, see 

Appendix C

. 

During  installation  it  must  be  made  sure  that  the  ventilation  grid  is 

NOT

  covered.  Once 

the shelf has been installed, it must be checked that the ventilation grid on the top is 

NOT

 

obstructed in any way.   

When  installing  the  terminal  in  a  frame  of  a  cabinet,  in  order  to  improve  ventilation,  a 

space equivalent to at least one standard unit must be left above and below it. 

Summary of Contents for TPU-1

Page 1: ...MAT Antonio Machado 78 80 08840 Viladecans Barcelona Spain Tel 34 933 490 700 Fax 34 933 492 258 Mail to ziv zivautomation com www zivautomation com UNIVERSAL TELEPROTECTION TPU 1 INSTALLATION AND COMMISSIONING MANUAL Web version TPU 1R Rev 5 9 May 2018 ...

Page 2: ...Rev 5 9 May 2018 2 69 SAFETY SYMBOLS WARNING OR CAUTION This symbol denotes a hazard Not following the indicated procedure operation or alike could mean total or partial breakdown of the equipment or even injury to the personnel handling it NOTE Information or important aspects to take into account in a procedure operation or alike ...

Page 3: ... INTERFACE MODULES CIRCUITS FROM ONE TO TWO COMMANDS 12 3 3 DIGITAL LINE INTERFACE MODULE 14 3 4 DIGITAL SIGNAL I O INTERFACE MODULE DSTU 17 4 CONNECTIONS 18 4 1 POWER SUPPLY 19 4 2 PROCESSING MODULE 20 4 3 LINE INTERFACE MODULES 21 4 3 1 IETU module 21 4 3 2 IDTU module 24 4 3 3 IOTU module 25 4 3 4 IOCT module 26 4 3 5 IPIT module 27 4 3 6 IATU and IBTU modules 28 4 4 PROTECTION SIDE INTERFACE M...

Page 4: ...GEMENT COMPUTER 35 5 5 1 Characteristics of the management computer 36 5 5 2 Connections 36 5 5 3 Configuration 39 5 6 STARTING UP THE WEB SERVER 40 5 7 CERTIFICATE OF AUTHENTICITY 42 5 8 LEAVING THE WEB MANAGEMENT 42 5 9 ON LINE WEB MANAGEMENT AND OFF LINE WEB MANAGEMENT 42 5 10 UPDATING THE WEB SERVER PAGES 43 6 MAINTENANCE 44 7 TRANSPORT AND STORAGE 47 7 1 TRANSPORT 47 7 2 STORAGE 48 APPENDIX A...

Page 5: ...minal and how to replace the modules without damaging either the modules or the terminal It goes on to describe the function of the optical indicators on the front plate and shows the position and function of the internal jumpers that can be configured by the user It then describes the external connections of both the power supply and the signals Finally it deals with the commissioning procedure w...

Page 6: ...ns of the TPU 1 shelf The input and output of signals is carried out by means of the plug in connectors located at the rear of the shelf If one wishes the external connections to be carried out through a cabinet mounting terminal block it can be supplied on request together with the necessary cables see Appendix C During installation it must be made sure that the ventilation grid is NOT covered On...

Page 7: ...lication can be inserted in any position of the shelf see Figure 2 Figure 2 Internal rear view of the TPU 1 shelf The correspondence between connectors and slots should be taken into account when establishing the constitution of the equipment from the Management System in order to carry out configuration It is therefore necessary to indicate the slots one wishes to configure and the type of module...

Page 8: ...ld be carried 1 Release the two fixing screws of the module Depending on the type of module the earth cable is attached to the upper screw In that case disconnect it 2 Extract the module by means of the handles 3 Depending on the type of module extract the connector The earth cable of the module was disconnected in point 1 Once the module is inserted in the shelf tighten the module to the chassis ...

Page 9: ...ssible communication channels that can manage the terminal and to the command transmission and reception circuits The front plate also has an USB connector that is for Pweb management 1 It can also have an optional LCD display which allows certain parameters of the terminal to be monitored see Appendix D without having to access the Management System Figure 3 and Figure 4 show the signalling of th...

Page 10: ...cation solutions for power utilities UNIVERSAL TELEPROTECTION TPU 1 INSTALLATION AND COMMISSIONING MANUAL Web version TPU 1R Rev 5 9 May 2018 10 69 Figure 4 Signalling of LEDs II Figure 5 Optional LCD display ...

Page 11: ...8 By carrying out a jumper between pin 1 of J7 and pin 1 of J8 the IP address by default as well as the default user passwords are loaded in the terminal as indicated in Table 1 Administrator login Basic login Administrator password Basic password IP address admin basic admin basic 172 16 6 3 Table 1 Default values activated when a jumper between pin 1 of J7 and pin 1 of J8 is carried out Figure 6...

Page 12: ...DC Once the nominal voltage has been established the minimum voltage that guarantees the input activation is 19 VDC for 24 VDC 38 VDC for 48 VDC 88 VDC for 110 VDC and 176 VDC for 220 VDC and the maximum voltage that guarantees NON input activation is 14 VDC for 24 VDC 29 VDC for 48 VDC 66 VDC for 110 VDC and 132 VDC for 220 VDC Figure 7 shows the position of the input activation nominal voltage c...

Page 13: ... for power utilities UNIVERSAL TELEPROTECTION TPU 1 INSTALLATION AND COMMISSIONING MANUAL Web version TPU 1R Rev 5 9 May 2018 13 69 b Model B Figure 7 Input activation nominal voltage configuration jumpers of the IPTU module ...

Page 14: ...responds to the shield connected to earth As can be seen in Figure 9 the IDTU 00 modules of version 3 0 have the P1 P2 setting and two jumpers prepared for soldering identified as C97 and C98 The P1 P2 setting allows the selection of the output impedance according to the type of connector P1 1 and P2 1 closed 120 Ω RJ 45 P1 1 and P2 1 open 75 Ω BNC In IDTU 00 modules of version 3 1 the type of con...

Page 15: ...er utilities UNIVERSAL TELEPROTECTION TPU 1 INSTALLATION AND COMMISSIONING MANUAL Web version TPU 1R Rev 5 9 May 2018 15 69 Figure 8 Location of jumpers S7 and S8 prepared for soldering of the IDTU 00 module of version lower than 3 0 ...

Page 16: ...UNIVERSAL TELEPROTECTION TPU 1 INSTALLATION AND COMMISSIONING MANUAL Web version TPU 1R Rev 5 9 May 2018 16 69 a Location of P1 P2 setting b Location of C97 and C98 solder jumpers Figure 9 Location of settings in the IDTU 00 module of version 3 0 ...

Page 17: ...oltage has been established the minimum voltage that guarantees the input activation is 19 VDC for 24 VDC 38 VDC for 48 VDC and 100 VDC for 110 VDC and the maximum activation voltage which must under NO circumstances be exceeded is 28 VDC for 24 VDC 57 VDC for 48 VDC and 150 VDC for 110 VDC The minimum voltage that guarantees NON activation is 10 VDC for 24 VDC 19 VDC for 48 VDC and 50 VDC for 110...

Page 18: ... connections If one wishes the external connections to be carried out through a cabinet mounting terminal block it can be supplied on request together with the necessary cables see Appendix C Figure 11 Rear view of the TPU 1 shelf In disturbed environments it is recommended to use screened cables for the connections For safety reasons the screen of the connection cables must be grounded the connec...

Page 19: ...ply module Figure 12 shows a front view of the ATPU power supply module As can be seen the power supply module has two terminal blocks on the front plate One is associated with the power supply and the other to the power supply alarm relay In normal operation conditions the alarm relay is energized that is to say the N O and C contacts are short circuited Should a failure occur in the power supply...

Page 20: ... time equipment The BNC connector allows the TPU 1 terminal to synchronize its internal real time clock with the time reference given by any GPS synchronized time equipment that has an IRIG B standard output The operation of the RJ 45 10 100Base Tx interface or MT RJ 100Base Fx interface connector must be established from the Management System Make sure that the module is completely fixed to the c...

Page 21: ...he digital line interface modules available are IETU IDTU IOTU IOCT and IPIT The analog line interface modules available are IATU and IBTU 4 3 1 IETU module The IETU module gives a 64 kbit s interface that can be programmed according to Recommendations X 21 V 11 V 35 or G 703 of the ITU T The IETU module has a 15 pin SUB D connector on the front plate Figure 14 to Figure 18 show the assignment of ...

Page 22: ...NIVERSAL TELEPROTECTION TPU 1 INSTALLATION AND COMMISSIONING MANUAL Web version TPU 1R Rev 5 9 May 2018 22 69 Figure 15 Use of the connector of the IETU module for X 21 interface Figure 16 Use of the connector of the IETU module for V 35 interface ...

Page 23: ...OMMISSIONING MANUAL Web version TPU 1R Rev 5 9 May 2018 23 69 Figure 17 Use of the connector of the IETU module for G 703 codirectional interface Figure 18 Use of the connector of the IETU module for G 703 contradirectional interface Make sure that the module is completely fixed to the chassis ...

Page 24: ... connector 120 Ω for twisted pair The output impedance 75 Ω or 120 Ω according to the type of connector and whether the cable shield is connected to earth output not balanced or not output balanced is configured by internal settings In IDTU 00 modules of version 3 1 the type of connector BNC or RJ 45 is programmed from the TPU 1 Management System Make sure that the module is completely fixed to th...

Page 25: ... 4 3 3 IOTU module The IOTU module gives a 64 kbit s interface for optical fiber Figure 20 shows a front view of the IOTU module As can be seen in the figure the module has two female FC connectors one for transmission and the other for reception Make sure that the module is completely fixed to the chassis Figure 20 IOTU line interface module connectors ...

Page 26: ... for optical fiber Figure 21 shows a front view of the IOCT module As can be seen in the figure the module has two connectors one for transmission and the other for reception type ST female IOCT 00 or FC female IOCT 01 Make sure that the module is completely fixed to the chassis a IOCT module with ST female connectors IOCT 00 b IOCT module with FC female connectors IOCT 01 Figure 21 IOCT line inte...

Page 27: ...r an IP network Figure 22 shows a front view of the IPIT module As can be seen in the figure the module has two ports type 10 100Base Tx with RJ 45 connector IPIT 01 or 100Base Fx multimode 1300 nm with ST connector IPIT 00 The two ports have the same IP address Make sure that the module is completely fixed to the chassis c IPIT module with electrical connectors IPIT 01 d IPIT module with optical ...

Page 28: ...onnector The auxiliary relay is configurable from the Management System for command transmission signalling command output or alarm and if be the case unblocking In the case of alarm the relay will act for one or more of the following causes RTC synchronization failure Telemeasuring failure IEC 61850 link failure Power supply failure Main module failure Module failure in slot no Manual blocking an...

Page 29: ...wing causes RTC synchronization failure Telemeasuring failure IEC 61850 link failure Power supply failure Main module failure Module failure in slot no Manual blocking analog and digital Automatic test failure analog and digital Incorrect SIC security identification code digital Loss of synchronism digital Incorrect identification code digital BER alarm digital Remote Alarm Indication digital IOCT...

Page 30: ...dard Figure 25 shows a front view of the IEPT module As can be seen in the figure the module has two ports type 10 100Base Tx with RJ 45 connector IEPT 01 The input and output of the GOOSE messages is carried out through these ports The two ports have the same IP address Upon request instead of the above the module can be supplied with two optical ports type 100Base Fx multimode 1300 nm with ST co...

Page 31: ...or more of the following causes RTC synchronization failure Telemeasuring failure IEC 61850 link failure Power supply failure Main module failure Module failure in slot no Manual blocking analog and digital Automatic test failure analog and digital Incorrect SIC security identification code digital Loss of synchronism digital Incorrect identification code digital BER alarm digital Remote Alarm Ind...

Page 32: ...and digital signal I O interface modules can transmit and receive analog measurements and digital signals Figure 27 shows a front view of an MCTU module and Figure 28 a front view of a DSTU module The earth connection of the cable must be connected to the upper fixing screw Make sure that the module is completely fixed to the chassis AI Analog inputs remote measurements AO Analog outputs remote me...

Page 33: ...s UNIVERSAL TELEPROTECTION TPU 1 INSTALLATION AND COMMISSIONING MANUAL Web version TPU 1R Rev 5 9 May 2018 33 69 DI Digital inputs remote measurements DO Digital outputs remote measurements Figure 28 Connector of the digital signal module DSTU ...

Page 34: ...r or connectors of the line interface module or modules are connected correctly 5 Make sure that the connectors of the MWTU processing module are connected correctly 6 As far as programming is concerned it must be taken into account basic concepts such as operation of the line interface module or modules number of commands in transmission and reception input and output logic desired duration of co...

Page 35: ...ment menu From the said option it is possible to modify parameters such as IP address subnet mask etc in order for them to be compatible with the computer or computers that are going to be connected to the terminal By default the IP ADDRESS of the terminal is 172 16 6 3 When the IP ADDRESS by default is modified it is advisable to store the new address in some type of register as should the new ad...

Page 36: ...or higher JAVA virtual machine Sun Microsystems version 1 7 or higher 5 5 2 Connections 10 100Base TX LAN interface The TPU 1 terminal can have a 10 100Base TX LAN interface which allows it to be integrated into any network LAN that uses this interface The connector is on the front of the MWTU module and is a female 8 pin RJ 45 The cable used to carry out the connection between the terminal and th...

Page 37: ...irs according to ANSI TIA EIA 568 A standard Figure 29 Unshielded twisted pair category five cable UTP 5 with RJ 45 connector according to ANSI TIA EIA 568 A standard If the TPU 1 terminal is connected directly to the computer a crossover cable must be used see Figure 30 where pairs 2 and 3 at one end of the cable are reversed at the other However should the computer and the TPU 1 terminal are con...

Page 38: ...e taken of the characteristics of bandwidth noise immunity low attenuation long range etc given by the optical fiber The connector is on the front of the MWTU module and is a MT RJ The 100Base FX specifications require a fiber optic cable made up of two multi mode optical fibers one to transmit data and the other to receive it Each of the fibers should be 125 μm in diameter The core and the claddi...

Page 39: ...ed in the management computer it should be installed according to the LAN interface one wishes to use in the TPU 1 terminal 2 Open the network option of the Windows Control Panel 3 Select the properties of the TCP IP protocol of the network module installed in the management computer 4 Enter the network parameters IP address subnet mask and default gateway compatible with those of the TPU 1 termin...

Page 40: ...chine has been deleted In order to do so open the Windows Control panel and access the Java option From the Java Control panel access the General tab and in the Temporary Internet files section press on the Configuration button and in the new window that appears press on Delete files and disable the Save temporary files in my Computer option 4 If the operating system installed is the Microsoft Win...

Page 41: ...or the system to request the user password again the IP address of the web server must be introduced in the browser Once the user password has been introduced correctly a security message appears and once accepted the user password is requested once again before access to the Management System is permitted If the message DOES NOT appear correctly be sure the box Activate the Java Plug in of new ge...

Page 42: ...the X button located in the upper right hand corner of the window of the browser To enter a new address in the ADDRESS field of the browser screen Before leaving a window appears in the form of a warning asking whether you wish to save the information It is advisable to save the data on the disk or the terminal before leaving as any unsaved modification will be lost 5 9 ON LINE WEB MANAGEMENT AND ...

Page 43: ...anagement from the server These pages can only be downloaded by an ADMINISTRATOR user from the option Download of the MWTU submenu of the TPU 1 Management System Updatings menu You must acquire and decompress a file type tar 5 10 UPDATING THE WEB SERVER PAGES The option Update of the MWTU submenu of the TPU 1 Management System Updatings menu allows an ADMINISTRATOR user to update the web pages sto...

Page 44: ...hecking the command input output circuits Before carrying out a test of this type the command transmission should be suitably treated in order to make sure that no undesired output activation take place in the remote terminal In the local terminal check the command input circuits of the IPTU modules In order to do this with the aid of the Management System Input activation option of the Alignment ...

Page 45: ...ould be suitably treated in order to make sure that no undesired output activation take place Carry out command transmission Input activation option of the Alignment menu and check whether the activation has initiated the transmission of the desired command and the reception in case the terminal is not blocked e Checking the relays This operation involves cutting the teleprotection link Since some...

Page 46: ...n it should be deactivated Check that any terminal of the terminal block is disconnected Set the terminal clock by date and time using the Clocks and synchronism option of the Equipment menu Set the periodicity of the automatic test of the link by means of the Loops Blocking and Test option of the Alignment menu Reset the chronological register using the Chronological register option of the Monito...

Page 47: ...e the wooden box the cardboard box is covered with porexpan plates In some cases the equipment is delivered packed in a cardboard box To ease handling the maximum weight of a box does not exceed 25 Kg If the number of boxes to be transported is high they are stacked on pallets and wrapped with shrink film and reinforced with shrink plastic The TPU 1 terminals meet specifications EN 60721 3 2 class...

Page 48: ...f applicable return all material to ZIV in the original package The TPU 1 terminals should be stored in its own packaging until installation Storage must be done in premises protected from the weather Class C according to EN 60870 2 2 standard The temperature range should be between 20 C and 70 C The boxes should be stacked in a flat position A maximum of twelve boxes one above the other can be st...

Page 49: ... of the Client so it is necessary to enter an IP address in each one that is compatible with the one of the other An IP address has a length of 32 bits and is made up of two main parts a network number and a host number The 32 bits of an IP address are grouped into 4 sets of 8 bits represented in a decimal form and separated by dots dotted decimal as seen in Figure 34 Figure 34 Format of an IP add...

Page 50: ...Figure 35 Figure 35 Classes of IP addresses In IP addresses it is possible to use the bits devoted to the host number to create subnetworks justifying the existence of subnet masks which are used to identify the network number and the host number of an IP address and have the same format 32 bits Given an IP address and a subnet mask by performing an AND logical operation between them both the part...

Page 51: ...efault gateway In this way to configure the IP address the subnet mask and the default gateway of the web server of the TPU 1 terminal and the management computer it must be considered whether or not they belong to the same network If the TPU 1 terminal and the computer are connected directly or through a LAN they belong to the same network the IP address of each of them must have the same network...

Page 52: ...basic characteristics of the IEC 61850 architecture are the following The different elements of the substation such as teleprotections protections etc all use the same stack of protocols with a GOMSFE Generic Object Modelling for Substation Feeder and Equipment object oriented application layer The different elements generically known as IED Intelligent Electronic Device communicate with one anoth...

Page 53: ...ns and teleprotections to be replaced When the IED detects an event it must notify the change to the reception devices that it has registered using a multicast transmission The requirements are demanding Therefore no more than 4 ms delay is allowed from the moment the event takes place to the transmission of the message The number of IEDs the network topology and the type of event determines the n...

Page 54: ...ctively Protection side interface modules IPTU determine the number of cabinet mounting terminal blocks When the TPU 1 houses from one to four IPTU modules only one cabinet mounting terminal block is required and when there are more than four IPTU modules two cabinet mounting terminal blocks are necessary However when the TPU 1 terminal is equipped with two line interface modules and one or both l...

Page 55: ... to 6 mm2 rigid conductors and three associated with the power supply alarm relay which have disconnect devices and suitable for up to 2 5 mm2 flexible conductors and up to 4 mm2 rigid conductors Figure 37 shows the assignment of these terminals Figure 37 ZATU 00 terminal block ZPTU 00 terminal block The ZPTU 00 terminal block is associated with the IPTU protection side interface module This block...

Page 56: ...U 00 terminal block ZETU 00 terminal block The ZETU 00 terminal block is associated with the IETU digital line interface module As can be seen in Figure 40 this block is made up of a 15 pin SUB D type connector The use of the connector for the V 11 X 21 V 35 G 703 co directional and G 703 contradirectional interfaces is identical to that indicated in Figure 14 to Figure 18 respectively Figure 40 Z...

Page 57: ...ctors and up to 4 mm2 rigid conductors Figure 41 shows the assignment of these terminals for the IATU module Figure 41 ZITU 00 terminal block ZRTU terminal block Each type of IRTU relay interface module has a specific ZRTU terminal block associated with it as shown in Table 3 Module Relay no Block Terminal no IRTU 02 2 ZRTU 00 6 IRTU 04 4 ZRTU 04 12 Table 3 ZRTU terminal blocks The terminals have ...

Page 58: ...TU 01 terminal block The ZCTU 01 BB1 BB2 terminal blocks are associated with the MCTU current measurement module Each block has eight terminals which have disconnect devices and suitable for up to 2 5 mm2 flexible conductors and up to 4 mm2 rigid conductors Figure 43 shows the assignment of the BB1 and BB2 terminals Figure 43 ZCTU 01 BB1 BB2 terminal blocks ...

Page 59: ...s twelve terminals which have disconnect devices and suitable for up to 2 5 mm2 flexible conductors and up to 4 mm2 rigid conductors Figure 44 shows the assignment of the BB1 and BB2 terminals BB2 ZSTU 00 1 0 13 13 14 14 12 11 9 10 8 12 11 9 10 8 2 2 7 6 5 4 3 7 6 5 4 3 1 1 ZSTU 00 1 0 BB1 13 14 12 11 9 10 8 13 14 12 11 9 10 8 5 7 6 4 3 2 1 5 7 6 4 3 2 1 1 2 1 2 1 2 1 2 1 2 1 2 DI1 DI2 DI3 DI4 DI5...

Page 60: ... for power utilities UNIVERSAL TELEPROTECTION TPU 1 INSTALLATION AND COMMISSIONING MANUAL Web version TPU 1R Rev 5 9 May 2018 60 69 Figure 45 Main cabinet mounting terminal block for two digital channels and four IPTU modules ...

Page 61: ...er utilities UNIVERSAL TELEPROTECTION TPU 1 INSTALLATION AND COMMISSIONING MANUAL Web version TPU 1R Rev 5 9 May 2018 61 69 Figure 46 Main cabinet mounting terminal block for a digital channel and an analog channel three IPTU modules ...

Page 62: ...ns for power utilities UNIVERSAL TELEPROTECTION TPU 1 INSTALLATION AND COMMISSIONING MANUAL Web version TPU 1R Rev 5 9 May 2018 62 69 Figure 47 Main cabinet mounting terminal block for two analog channels three IPTU modules ...

Page 63: ...ilities UNIVERSAL TELEPROTECTION TPU 1 INSTALLATION AND COMMISSIONING MANUAL Web version TPU 1R Rev 5 9 May 2018 63 69 Figure 48 Main cabinet mounting terminal block for one analog channel and two relay interface modules two IPTU modules ...

Page 64: ...n solutions for power utilities UNIVERSAL TELEPROTECTION TPU 1 INSTALLATION AND COMMISSIONING MANUAL Web version TPU 1R Rev 5 9 May 2018 64 69 Figure 49 Additional cabinet mounting terminal block eight IPTU modules ...

Page 65: ...ion solutions for power utilities UNIVERSAL TELEPROTECTION TPU 1 INSTALLATION AND COMMISSIONING MANUAL Web version TPU 1R Rev 5 9 May 2018 65 69 Figure 50 General dimensions of the cabinet mounting terminal block ...

Page 66: ...on terminal can be supplied with an LCD display on demand As can be seen in Figure 51 the display has an associated push button Figure 51 Optional LCD display The LCD display is activated when the push button is pressed and automatically goes out when neither is pressed within 10 minutes This is in order to guarantee a longer life of the display Once the display is activated the push button must b...

Page 67: ...ISSIONING MANUAL Web version TPU 1R Rev 5 9 May 2018 67 69 The screen sequence is as follows 1 Main screen 2 Network parameters system 3 Network parameters IEC 61850 if be the case 4 Network parameters IP interface if be the case 5 Terminal alarms general 6 Terminal alarms specific if be the case ...

Page 68: ...OMMISSIONING MANUAL Web version TPU 1R Rev 5 9 May 2018 68 69 7 Input activation counters 8 Output activation counters 9 Command transmission counters of each communication channel 10 Command reception counters of each communication channel 11 Loop status without loops 12 Loop status with loops ...

Page 69: ...ure 52 the display shows the blocking situation of the terminal by means of the padlock symbol at the top of the display Figure 52 Blocking signalling in channel Terminal blocking is carried out from the corresponding option of the Management System When in a blocking situation the TPU 1 terminal cannot activate any output whether compatible or not with the IEC 61850 standard ...

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