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Mains pro 1.6.1 Global Guide

14

3.4.3 Connection with voltage transformers

MainsPro allows connecting HV or other measurement transformers with secondary rated voltage 100V.

Provide the "Star" or "Delta" arrangement on the primary windings of the transformers and connect the

secondary 100 V to the MainsPro measurement inputs. Setpoint

Uin (page 52)

is to be set to 120V. This setting

provides the guaranteed measurement accuracy for the 100V inputs with overrange to 120V * 130% = 156 VAC.

Note:

It is recommended to use “Delta” arrangement on the HV side to avoid nuisance tripping caused by phase

voltage unbalance.

3.4.4 Single-phase connection

MainsPro provides support for single-phase applications. Use the UA terminals to connect the measured

voltage to the unit and set the setpoint

System (page 52)

to 1ph. Use the same setting of rated voltage

selection as mentioned above.

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Summary of Contents for MainsPro

Page 1: ...de MainsPro Mains Decoupling Protection Relay SW version 1 6 1 1 Document information 6 2 Introduction of Installation and Operation Guide 9 3 Installation data 11 4 User interface 19 5 Introduction of Application Guide 28 6 Important Steps of MainsPro utilization 30 7 TRIP and Fault Reset 31 8 Protective features 33 9 Application tips 40 10 Introduction of Reference Guide 44 11 Technical data 45 ...

Page 2: ...rous voltage 10 2 3 2 Adjust the setpoints 10 3 Installation data 11 3 1 Dimensions 11 3 2 List of terminals 12 3 3 MainsPro Frame 12 3 4 Wiring 12 3 4 1 Star connection 13 3 4 2 Delta connection 13 3 4 3 Connection with voltage transformers 14 3 4 4 Single phase connection 14 3 4 5 Power supply 15 3 4 6 Relay outputs connection 16 3 4 7 Binary switches connection 16 3 5 Measurement range 16 3 6 W...

Page 3: ...eatures 33 8 1 ANSI 59 Overvoltage ANSI 27 Undervoltage 33 8 2 Floating 10 minutes average overvoltage 34 8 3 ANSI 81H Overfrequency 81L Underfrequency 34 8 4 ANSI 47 Voltage unbalance and angle asymmetry 36 8 4 1 Voltage unbalance 36 8 4 2 Positive sequence undervoltage Negative sequence overvoltage 36 8 5 ANSI 78 Vector shift 37 8 5 1 Measuring principle 38 8 6 81R Rate Of Change Of Frequency RO...

Page 4: ...e to the power supply voltage fails 47 11 3 Factory default setting of MainsPro unit 47 12 Appendix 50 12 1 Library of Setpoints 51 12 1 1 Group Basic 52 12 1 2 Group V A V 55 12 1 3 Group dU A dU 56 12 1 4 Group f A f 57 12 1 5 Group LOM A LOM 58 12 1 6 Group f BI 59 12 1 7 Group f RE 60 12 2 Library of Binary switches 61 12 2 1 Ext Trip 61 12 2 2 Fault Reset 61 12 2 3 Alt Settings 61 12 2 4 Disa...

Page 5: ... Sig 65 12 3 13 LOM Sig 65 12 3 14 LOM Sig 65 12 3 15 dU Sig 65 12 3 16 dU Sig 66 12 3 17 Other Sig 66 12 3 18 Other Sig 66 12 3 19 Alt Sig 66 12 3 20 TrpEndImp 66 12 3 21 TrpEndImp 67 12 3 22 InternFail 67 12 3 23 InternFail 67 12 3 24 BakTrpPer 67 12 3 25 BakTrpPer 67 12 3 26 BakTrpImp 68 12 3 27 BakTrpImp 68 ...

Page 6: ...Pro is very simple and intuitive for the operating personnel we recommend keeping one copy of this manual available permanently at the site where MainsPro unit is installed to facilitate the necessary service and operation tasks 1 2 2 Application Guide The Application Guide serves for the designers and engineers who process the necessary documentation and implementation procedures on the site wher...

Page 7: ...Permitted Reproductions Term of Use of the Documentation and to the Confidentiality rules please review and comply with the ComAp s License Agreement Terms and Conditions available on www comap control com Security Risk Disclaimer Pay attention to the following recommendations and measures to increase the level of security of ComAp products and services Please note that possible cyber attacks cann...

Page 8: ...n Thus it is intended to be used only in closed private network infrastructures Avoid exposing the port TCP 502 to the public Internet 5 SNMP The SNMP protocol port UDP 161 version 1 2 is not encrypted Thus it is intended to be used only in closed private network infrastructures Avoid exposing the port UDP 161 to the public Internet 1 4 Document history Revision number Related SW Date of issue Aut...

Page 9: ...r the operating personnel we recommend keeping one copy of this manual available permanently at the installation site where MainsPro unit is installed to facilitate the necessary service and operation tasks 2 2 Confornity declaration Following described machine complies with the appropriate basic safety and health requirement of the EC Low Voltage Directive No 73 23 EEC and EC Electromagnetic Comp...

Page 10: ...upply measurement inputs and or binary inputs 2 3 1 Dangerous voltage In no case touch the terminals for voltage and current measurement Always connect grounding terminals In any case do not disconnect controller CT terminals 2 3 2 Adjust the setpoints All parameters are adjusted to their typical values However the setpoints has to be checked and adjusted to their real values before the first star...

Page 11: ...1 6 1 Global Guide 11 3 Installation data 3 1 Dimensions 11 3 2 List of terminals 12 3 3 MainsPro Frame 12 3 4 Wiring 12 3 5 Measurement range 16 3 6 Wiring examples 17 6 back to Table of contents 3 1 Dimensions ...

Page 12: ...4 24 34 44 54 RE1 5 relay contact normally open during fault free conditions maintained in closed position L Power supply high range 85 265 VAC 110 370 VDC Power supply low range 8 40 VDC Connect pole to this terminal N Common terminal for power supply In case of DC supply connect pole to this terminal 3 3 MainsPro Frame MainsPro Frame is a MainsPro accessory product allowing door mounting of the ...

Page 13: ...tion of phase ground voltage measurement MainsPro provides over range to 130 of the rated voltage i e 300 VAC for 230 V system and 156 V for 120 V system with no change of measurement accuracy 3 4 2 Delta connection In this arrangement MainsPro is rated for 400 VAC ph ph with over range to 130 520 VAC with no change of measurement accuracy Setpoint Uin page 52 is to be set to 400 V no additional s...

Page 14: ... Uin page 52 is to be set to 120V This setting provides the guaranteed measurement accuracy for the 100V inputs with overrange to 120V 130 156 VAC Note It is recommended to use Delta arrangement on the HV side to avoid nuisance tripping caused by phase voltage unbalance 3 4 4 Single phase connection MainsPro provides support for single phase applications Use the UA terminals to connect the measure...

Page 15: ...ithstand corresponding to the appropriate power supply range and comply with the standards relevant for the installation Note External power supply is recommended in order to avoid excess of allowed supply voltage 256Vrms respectively 370V of peak value including dc offset Please be aware that not all power meters can detect the supply voltage including the dc component Note The difference between...

Page 16: ...signable by the setpoints f RE In default configuration RE1 serves as the permanently energized common trip output contact CommTrpPer page 63 Use this contact to operate the connector devices with permanently energized inputs In default configuration RE2 serves as an impulse common trip contact CommTrpImp page 63 Use this contact to operate e g opening or UV coil of circuit breakers Remaining 3 re...

Page 17: ...aranteed accuracy applies to both ranges 100 and 120 V Overshoot by 30 up to 156V is possible for this measurement range For this case set the setpoint Uin page 52 to 120V 3 6 Wiring examples This chapter provides examples of possible wiring of MainsPro which can be used as a preparation concept of wiring scheme Note ComAp bears no responsibility of functionality of the solution where these concep...

Page 18: ...ains pro 1 6 1 Global Guide 18 3 Under normal conditions the contacts are closed in case of failure the contacts open This wiring is typically used for coil driven contactors 6 back to Installation data ...

Page 19: ... 22 4 4 Measurement screens 24 4 5 Alarm messages 26 6 back to Table of contents 4 1 Front panel elements Number Description 4 x 20 Alpha numerical display Mechanical sealing indication Frequency measurement 3 phase voltage measurement Last trip indication Last trip timer Control and navigation pushbuttons Fault Reset button ...

Page 20: ... to the first group and vice versa 3 By button or ENTER enter the setpoint group by button move one level up in the setpoint tree The setpoints are displayed in the cycling order i e from the last setpoint by button the cursor moves to the first one and vice versa 4 If standing on a setpoint the setpoint change screen opens by pressing ENTER or In the screen see the setpoint limits at the lowest r...

Page 21: ...at the same time 2 Press to enter the Clear Statistics dialog screen 3 Using and do your selection By selecting YES all trip counters will be reset Press ENTER to confirm your selection 4 By selecting NO and pressing ENTER or by pressing ESC return to the measurement screens with no change 4 1 5 TEST mode activation 1 Enter the init screen by pushing the ENTER and ESC at the same time 2 Press and ...

Page 22: ...d position by sealing wire The locked position is indicated at the MainsPro side print and on the alphanumerical display 4 3 Signalization LEDs There are 7 LEDs for indication of MainsPro status with the meaning indicated in the table below In case of signaling different statuses by one LED the following priorities apply i e the higher priority signal is provided by the LED Red flashing Red Orange...

Page 23: ... page 34 is detected Nothing Over under voltage protections are not enabled by setpoint and no other voltage failure is sensed f Red flashing Frequency as sensed on terminals Ua is above threshold for 1st or 2nd stage overfrequency Red Frequency as sensed on terminals Ua is under threshold for 1st or 2nd stage underfrequency Orange flashing Together with LED U and LOM indicates incorrect phase rot...

Page 24: ...lication U measured voltages on terminal sets Ua Ub and Uc If overvoltage or undervoltage is detected on a particular phase arrow symbol is displayed left of the particular voltage value f measured frequency on terminal set Ua If overfrequency or underfrequency is detected arrow symbol is displayed left of the frequency value Last Trip indication of the latest event which caused trip by the MainsP...

Page 25: ...e page 36 Binary switches status screen List of the assigned binary switches Functions that are configured are displayed in the appropriate order Its status is displayed in brackets Relay outputs 1 4 status screen Status of the first 4 MainsPro relay outputs Name in parenthesis marks the function assigned by the setpoints in group f RE Relay output 5 status screen Status of the 5th MainsPro relay ...

Page 26: ...y Find more in Technical data page 45 Trip history screen List of last five trips contains reason of the trip and time since the unit was powered up Note For case of power cut off the time stamp is stored and after the unit is powered up again the timer will start from the from following second after the last stored one 4 5 Alarm messages One of these indications appears on the homepage screen in ...

Page 27: ...7 Vneg Negative sequence overvoltage Vpos Positive sequence undervoltage Vavg 10 minutes floating average overvoltage Rot Wrong phase rotation Pol Wrong polarity of one phase Ext External trip STr Start Trip 6 back to User interface ...

Page 28: ...r During this fault clearing period the generators may move away from synchronism and their eventual re connection may cause severe damage to the property of the generator operator or to the utility equipment The sole operation of a generator into an unintentionally islanded part of electricity network provides potentially dangerous situation The load of the area may exceed the generator capacity ...

Page 29: ...Mains pro 1 6 1 Global Guide 29 Small hydro power plant Photovoltaic power plant Windmills 6 back to Introduction of Application Guide ...

Page 30: ... Global Guide 30 6 Important Steps of MainsPro utilization This process describes a typical decisions and technical steps to follow in case of MainsPro utilization if required by the distribution network operator DNO ...

Page 31: ... and the last trip indication is set 7 1 2 TRIP status Starts at the moment of TRIP event During this status the appropriate outputs are kept in fault position During this status it is not possible to perform Fault reset TRIP status is active until a successful Fault reset This may not be done before all measured and evaluated values are within preset limits If during the TRIP status caused by som...

Page 32: ...timer is reset and started no sooner than after all evaluated values are back within limits again The above mentioned reasons are a trigger to provide Fault reset however it is successfully done only in case that the TRIP status is activated and all evaluated values have returned back into limits If the TRIP status is not activated or it is activated but any of the values is still out of limits Fa...

Page 33: ...er underreached the appropriate LED signal is issued by LED U and the output U Sig moves to fault indicating position immediately If voltage of in the given phase keeps out of limits for the delay of the appropriate stage TRIP page 31 is issued As the voltage returns back within limits in all measured phases the LED and U Sig page 64 output stop to signal the fault state immediately regardless of ...

Page 34: ...aches the setpoint Avg V V page 55 TRIP page 31 is issued LED U flashes and counter of voltage disturbances is incremented As the Last Trip record the message Vavg is displayed The protection stage is blocked for the first 10 minutes after power up of the unit 8 3 ANSI 81H Overfrequency 81L Underfrequency The frequency value measured on phase L1 is compared with the preset limit of overfrequency o...

Page 35: ...provide possibility of setting 2 levels with independent delay assigned to each level Note MainsPro measures frequency on the phase L1 only therefore frequency measurement will be distorted in case that a fault occurs in this phase In order to prevent from unwanted frequency oscillation around the overfrequency respective underfrequency limits there is a possibility to set up a frequency hysteresi...

Page 36: ...asured voltage 8 4 2 Positive sequence undervoltage Negative sequence overvoltage These two methods provide very good sensitivity also to angle asymmetry of the measured voltages The evaluation is based on the mathematical principle of evaluation of the symmetrical components of measured voltage Any 3 phase system in any asymmetrical arrangement may be decomposed to 3 perfectly symmetrical compone...

Page 37: ...nse loss of one phase further in the system The only change seen in such situation may be movement of the failed phase by a certain angle with small or no voltage drop in the absolute values This may not be detected by undervoltage or unbalance protection stage Symmetrical components provide very good and sensitive method to detect such a situation and trip the generator in case of this situation ...

Page 38: ...l with the mains In case of mains failure or auto reclosing the generator suddenly feeds a very high consumer load The rotor displacement angle is decreased repeatedly and the voltage vector g changes its direction to g Image 8 7 At mains failure As shown in the timing diagram the voltage jumps to another value and the phase position changes This procedure is called phase or vector surge MainsPro ...

Page 39: ...mediately in case of fast frequency changes The threshold is set by the setpoint ROCOF A ROCOF Hz s page 58 As the ROCOF stage provides very sensitive protection software filter may be set using the LOM ROCOF filt setpoint By appropriate setting of those two setpoints perfect ratio between sensitivity and speed of reaction of ROCOF protection may be established at the field tests Note ROCOF is sen...

Page 40: ...ate is indicated by flashing red signal of the TRIP LED If during this time any measured value reaches out of the preset limits MainsPro terminates the automatic fault reset count down and goes back into fault indication state The automatic fault reset is reset and started again in the moment when all measured values are back in limits again After automatic fault reset is count down to zero the un...

Page 41: ...case that a specific setting of the protection relay is required by the mains operator when exceptional conditions occur After deactivation the unit immediately switches to the default groups of setpoints 9 2 4 Disable The Disable page 61 switch may be used for blocking the MainsPro protective functions e g in case that the generator is not running in parallel operation with mains or any other blo...

Page 42: ...eturn to mains in case that the mains is completely lost and MainsPro unit is powered from the same mains voltage 9 6 TEST mode MainsPro provides a TEST mode which enables phase to phase testing of 3 phase protective features by single phase power source The test mode may be activated by entering the init screen entered by pressing the ENTER and ESC at the same time Follow by button and then butto...

Page 43: ...sign TEST is displayed in the bottom line instead of the last trip information If any TRIP is performed during the TEST mode no counters are incremented and the last trip indication and timer is not affected In the TEST mode it is possible to change setpoints but some functionality which is disabled in the TEST mode e g voltage asymmetry setting or assignment of f RE is not active After return fro...

Page 44: ...1 Purpose of this manual The Reference Guide contains library of setpoints inputs and outputs functionalities and technical data for the purpose of detailed technical information This information is referenced in the Installation and Operation Guide and Application Guide ...

Page 45: ...s and reaction times 11 1 1 Operating area MainsPro provides the below mentioned accuracies and reaction times in case that the measured voltage on all 3 phases is within the green area on the picture below Outside of the green area MainsPro provides the expected performance i e trips in case of voltage overreaching the green area border but the behaviour accuracies and reaction times may not be g...

Page 46: ... Frequency measurement Frequency measurement is 0 1 Hz in the complete green operating area Maximum reaction time for frequency failures in case of the delay set to 0 00 s is 75 ms This is valid in complete green operating area 11 1 4 Time delays accuracy The unit allows to set the time delays with step 10 ms The maximum tolerance of the unit timing is 3 15ms 11 1 5 Loss of Mains reaction times Re...

Page 47: ... by means corresponding to the environment of the unit operation It is possible to make the user interface accessible to the operation staff 11 2 1 Endurance to the power supply voltage fails MainsPro unit withstands the power supply voltages failures of 100 ms lengths in the full range of power supply voltage on the 85 265 VAC 110 370 VDC terminals and at the voltage 18 40 VDC connected to the 8 ...

Page 48: ...uency delay 1 f f f f Del 47 50 20 00 0 1 0 01 Hz s Underfrequency limit 2 Underfrequency delay 2 f f f f Del 47 00 0 50 0 1 0 01 Hz s Overfrequency hysteresis f Rstf Rstf 100 0 1 Underfrequency hysteresis f Rstf Rstf 100 0 1 Vector shift limit ROCOF limit ROCOF filter ROCOF delay Vector shift and ROCOF evaluation delay LOM LOM LOM LOM LOM Vs Lim ROCOF ROCOF Filt ROCOF Del LOM Init Del 0 1 9 0 5 3...

Page 49: ...ry Please refer to the MainsPro Installation and Operation Guide for the wiring explanation and to the MainsPro Reference Guide for information about the setpoints adjustment ComAp states that the mentioned setting is guaranteed for all MainsPro units SW version 1 5 upon shipment of a new unit if no other setting is explicitly requested In case of need the factory default settings can be provided ...

Page 50: ...Mains pro 1 6 1 Global Guide 50 12 Appendix 12 1 Library of Setpoints 51 12 2 Library of Binary switches 61 12 3 Relay outputs 62 6 back to Table of contents ...

Page 51: ...witched to the setting done in the A xx group see Library of Binary switches on page 61 Uin 52 System 52 DispT min 52 Auto FR 52 Auto FR Del s 53 Start Trip 53 Imp Len s 53 Bak Trp Del s 53 Ext 54 F R 54 Alt 54 Disable 54 V V V V A V A V A V A V V 55 V del V del V del V del s 55 Avg V V 55 RstV V V 56 RstV V V 56 V unb A V unb V 56 V pos A V pos V 56 V neg A V neg V 57 dU del A dU del s 57 f f f f...

Page 52: ...se or three phase application In case of single phase setting the voltage on last two phases and voltage asymmetry are not measured 3ph the unit measures 3 phase system 1ph the unit measures single phase system Default setting 3ph 6 back to Library of Setpoints DispT min Setting of display backlight timeout since the last button activity Range 1 60 min 0 min OFF display is set to permanent backlig...

Page 53: ...successful fault reset its outputs are set to the fault free state DISABLED after power up all values are evaluated on the measurement inputs and depending on the measured values the unit goes either into fault free or TRIP state Default setting DISABLED 6 back to Library of Setpoints Imp Len s Impulse length in case of activation of various impulse outputs of the protection The setpoint is revere...

Page 54: ...LED 6 back to Library of Setpoints Alt Enables or disables the functionality of the Alternative settings binary switch ENABLED the binary switch is enabled DISABLED the binary switch is disabled Default setting ENABLED 6 back to Library of Setpoints Disable Enables or disables the functionality of the Disable binary switch ENABLED the binary switch is enabled ENABLEDexlTRP the binary switch is ena...

Page 55: ...red voltage i e ph to N voltage measurement In case of using Delta connection the appropriate change of the setpoints to ph ph voltage is necessary 6 back to Library of Setpoints V del V del V del V del s Delay of the appropriate stage of the voltage protection Range 0 00 600 00 s Default setting V Del 1 00 s V Del 0 50 s V Del 2 50 s V Del 0 50 s 6 back to Library of Setpoints Avg V V Limit for F...

Page 56: ... percentage of undervoltage threshold In case the nominal voltage is 230 V and the undervoltage threshold is 200 V the hysteresis limit for default setting 104 V is 208 V It means that voltage must get over 208 V to reset the fault Range 100 110 V 0 OFF the reset threshold is not activated Default setting 100 V 6 back to Library of Setpoints 12 1 3 Group dU A dU V unb A V unb V Threshold of the vo...

Page 57: ...Library of Setpoints 12 1 4 Group f A f f f f f A f A f A f A f Hz Threshold of 1st and 2nd stage overfrequency and 1st and 2nd stage underfrequency protection respectively Range 45 00 65 00 Hz 0 OFF the appropriate stage of frequency protection is not enabled Default setting f 0 Hz f 52 00 Hz f 47 50 Hz f 47 00 Hz 6 back to Library of Setpoints f del f del f del f del A f del A f del A f del A f ...

Page 58: ...requency The TRIP status will be terminated Range 100 0 110 0 f 0 OFF the reset threshold is not activated Default setting 100 0 f 6 back to Library of Setpoints 12 1 5 Group LOM A LOM VS lim A VS lim Threshold at which the Vector shift protection is activated Range 1 50 0 OFF the Vector shift protection is not enabled Default setting 0 6 back to Library of Setpoints ROCOF A ROCOF Hz s Threshold a...

Page 59: ...ration of Loss of Mains LOM i e Vector shift and ROCOF protection trip After this delay the fault is considered as terminated and Fault reset is possible In case of automatic fault reset the timer is started Range 0 3600 s Default setting 3 s 6 back to Library of Setpoints ROCOF Del A ROCOF Del s When ROCOF value is above the ROCOF threshold trip is delayed based on ROCOF Del setting ROCOF protect...

Page 60: ... to the appropriate relay output 1 to 5 For description see Relay outputs on page 62 CommTrpPer CommTrpPer CommTrpImp CommTrpImp CommSigImp CommSigImp CommSigDel CommSigDel U Sig U Sig f Sig f Sig LOM Sig LOM Sig dU Sig dU Sig Other Sig Other Sig Alt sig TrpEndImp InternFail BakTrpPer BakTrpImp Default setting RE1 CommTrpPer RE2 CommTrpImp RE3 BakTrpImp RE4 InternFail RE5 TrpEndImp 6 back to Libra...

Page 61: ...over comes in the moment when a delay of some of the protection stage is being count down the unit is about to trip the timer setting is kept as before the switch However if the trip conditions change during the delay run e g by changing the protection threshold the trip is not performed 12 2 4 Disable Activation of this switch disables immediately all protective features of the unit The switch ma...

Page 62: ...ays to normal logic so the outputs maintain de energized in fault free state and in case of a trip the relays energize 12 3 1 CommTrpPer 63 12 3 2 CommTrpPer 63 12 3 3 CommTrpImp 63 12 3 4 CommTrpImp 63 12 3 5 CommSigImp 63 12 3 6 CommSigImp 64 12 3 7 CommSigDel 64 12 3 8 CommSigDel 64 12 3 9 U Sig 64 12 3 10 U Sig 64 12 3 11 f Sig 65 12 3 12 f Sig 65 12 3 13 LOM Sig 65 12 3 14 LOM Sig 65 12 3 15 ...

Page 63: ...se of LOM protection Vector shift or ROCOF External trip incorrect phase rotation or wrong phase polarity Relay opens after Imp Len s page 53 has timed out his opening however does not mean end of trip state Trip is terminated in fault free state after a successful fault reset In case of LOM protection the delay LOM Trp Del A LOM Trp Del s page 59 is timed out and after this time it is possible to...

Page 64: ...her detected fault state during run of this timer causes a new activation of this relay or extends timing of Imp Len s page 53 by the new impulse length from the moment of the failure detection Fault reset has no influence on this output 6 back to Relay outputs 12 3 9 U Sig Immediate signaling relay voltage closes immediately in case of voltage failure over under voltage or average overvoltage Rel...

Page 65: ...ase of loss of mains failure Vector shift or ROCOF Relay opens afterLOM Trp Del A LOM Trp Del s page 59 since the last LOM protection activation Fault reset has no influence on this output If any LOM protection is disabled by setpoint limit set to 0 the output does not signal activation of this protection stage 6 back to Relay outputs 12 3 14 LOM Sig Inverse immediate signaling relay loss of mains...

Page 66: ...ns immediately in case of incorrect phase rotation wrong polarity of one phase or External trip Relay closes in case that all observed failures are not active but no sooner than after Imp Len s page 53 from its activation If the relay is open during trip activation it closes no sooner than Basic Imp Len since trip status activation Fault reset has no influence on this output 6 back to Relay output...

Page 67: ...d either by pressing the Fault reset button or through binary input has no influence on this output 6 back to Relay outputs 12 3 23 InternFail Inverse immediate signaling relay internal failures opens immediately in case of internal software failure including watchdog activation Relay closes in case that all observed failures are not active but no sooner than after Imp Len s page 53 from its activ...

Page 68: ...put are not configured on any physical input or output this function is blocked 6 back to Relay outputs 12 3 27 BakTrpImp Inverse backup trip impulse relay opens immediately if any of the CommTrpPer page 63 or CommTrpImp page 63 is activated and CB Feedback doesn t deactivate within Bak Trp Del The length of the impulse can be adjusted in Imp Len s page 53 Closing of the relay does not mean end of...

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