p740 testing procedure

8/17/2019 P740 Testing Procedure

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TEST PROCEDURE FOR P740

SCHEME.

REQUIREMENTS FOR THE COMMISSIONING OF P740 SCHEME:


2/18

• MICOM S1 Software or MICOM STUDIO installed with MICOM P740

Topology software.

• Clear SD re!"ired for the #"s$ar %oltage le%el& whi'h we are going to

'o((ission.• )*a't CT lo'ation and the Star point of CT for the indi%id"al feeder.

• CT se'ondary winding resistan'e& ead $"rden re!"ired for indi%id"al feeder

fro( the CT lo'ation to the +elay Panel T#& CT ,nee point %oltage.

DRAWING THE TOPOLOGY:

• #y opening P740 window& in MICOM S1& fo"r (en"s will $e there.

a- )le'tri'al S'he(e editor

$- Synopti''- Dyna(i' synopti'd- Merger.

• )le'tri'al s'he(e editor is "sed to draw the 't"al Topology SD for the #"s$ar

prote'tion.

• Synopti' is "sed to assign the PU/s for the indi%id"al #ay with the pri(ary

e!"ip(ents.

• Dyna(i' synopti' file. o" 'an a$le to "se& only if the )le'tri'al s'he(e editor is

drawn and 'o(piled with the Synopti' tool. fter 'o(piling the SD& yo" 'an

find the .dyn file. #y opening the file& yo" 'an see the SD what yo" ha%e drawnand also the stat"s of the )!"ip(ents 2#"s Isolator& #rea3er. Stat"s& it will show

on'e yo" 'onne't this SD to the Central "nit or Pheriperal "nit.

• Merger is "sed to (erge the Topology file with the setting files to sa%e the ti(e

'ons"(ption.

ELECTRICAL SCHEME EDITOR:

• #y opening the )le'tri'al s'he(e editor& window will open& #efore drawing yo"r

SD& 3eep in (ind that& what e%er the #"s yo" are drawing will $e the #"s5&and whate%er the Isolator yo" are drawing will $e the #"s5 isolator.

5 +epresent #"s$ar.


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5 +epresent CT 2rrow represent the CT Start point

5 +epresent Isolator.

5 +epresent #rea3er

5 +epresent 6eeder

5 +epresent in3s 2Use to 'onne't the e!"ip(ents& #"s to Isolator/s&Isolators to #rea3er& #rea3er to CT& CT to 6eeder ref& et'

Example ee!e" :

#"s Isolator

#rea3er

CT 2Star point towards the $"s

6eeder

• i3e this& we 'an draw the 6"ll SD of the s'he(e.

• fter 'o(pleting the drawing& we ha%e to sa%e this in any lo'ation.

• fter sa%ing the file& we ha%e to 'o(pile it. o to the Tools (en" and sele't the

8Sa%e and 'o(pile9 option. If any (ista3e we ha%e did in the SD& it wont allow

"s to 'o(pile. fter 'li'3ing that $"tton. It will show the (essage as 8Co(pilation finished9


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SYNOPTIC:

• #y opening this& we 'an see a window& and then open the SD we ha%e dawn

fro( the 6ile (en".

• #efore assigning the PU/s to the SD& ,eep in (ind that whate%er the PU/s pla'ing first will $e of ddress no 7 and se'ond will $e :;;. PU/s 'an $e pla'edat the $otto( of indi%id"al feeder.2'an $e pla'ed anywhere& 6eeder per PU.

• fter opening this synopti'& yo" ha%e to ena$le the )dit (ode $y 'li'3ing the )dit

(ode on the top.

• Then after o"r PU/s sy($ol will $e ena$led 8& #"s >#& CT57& CT5:..& ?71& ?7@;et'....

• fter 'he'3ing this& again we ha%e to 'o(pile this synopti' to get the Topologyfile. So go to edit (ode& sele't 8sa%e and 'o(pile to other (odel relays9. On'e we'li'3 this it will show the (essage as 8'on%ersion finished9.

• On'e this (essage appeared& yo" 'an find a folder 8***AsetAdyn9 in the lo'ation

where we ha%e stored the SD file. This folder will 'ontain the Topology file for

all the PU/s as well as the CU topology file.


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E#AMPLE SYNOPTIC DRAWING:

NOTE:

• #efore "ploading any topology to the PU or CU& it/s (andatory to 8'old restart

the relay9.

• fter 'old restart& gi%e the proper address& what we ha%e drawn in the Topology.

Central "nit always $ear the Bth address.

• s (entioned earlier& first feeder drawn will $ear the 7th address and se'ond of :th

address;.

• If the (is(at'h happened li3e& 6irst feeder topology we ha%e "ploaded to the

relay $earing the address no . 8Config error9 will appear.

• 6irst "pload the Topology in the 'entral "nit and gi%e the 'orresponding address in

all the Pheriperal "nits. So that all the PU/s topology 'an $e "ploaded fro( the

CU itself& $y sele'ting the 'orresponding address while opening the

'o(("ni'ation portion.

MERGER:


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• fter 'o(pilation in the Synopti' software& we will $e ha%ing only the Topology

file& not the setting file.

• or(ally& we "sed to first "pload the topology to the PU. nd then again e*tra't

the settings fro( relay& in whi'h we will $e ha%ing the Topo and settings.

• This pro'ess we ha%e to do it in all the PU/s. so it 'ons"(es ti(e.

• This (erger software "sed to (erge the setting file with the Topology file

generated.

• or(ally& CT ratio& ## settings& ,nee point %oltage& inp"t la$els& o"tp"t la$els&

Dist"r$an'e settings& 'onfig"ration setting will $e the sa(e for all the feeders.

• #efore "ploading the Topology& as (entioned earlier& we ha%e to 'old restart the

relay. fter 'old restart& the relay will $e ha%ing the defa"lt topology. 6irst e*tra't

the file fro( the relay sa%e it as in the na(e of 8so"r'e file9 2'an $e any na(e.

• Open the Merger software& fo"r $lo'3s it will show& Destination folder& So"r'e

file 'ontaining para(eters& So"r'e file 'ontaining Topology and Destination file

na(e.

• In the Destination folder& sele't the 6older path where it has to store 2files

'ontaining TopoEset.

• In the so"r'e file 'ontaining Para(eters& sele't the so"r'e file we ha%e e*tra'ted

fro( the relay after 'old restarting.

• In the so"r'e file 'ontaining Topology& sele't all the Topology files generated after

'o(pilation e*'ept the CU topo file. Then sele't #"ild.

• It will show "s on what na(e it has to store. i%e the na(e li3e PU7 $elongs to

,ar"r feeder and PU: $elongs to Mad"rai feeder et';;

• fter 'o(pleting all a$o%e pro'ess& we 'an a$le to start the testing.

• #efore testing& all the Isolator and #rea3er stat"s to 'he'3ed properly in

indi%id"al $ay.


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How to measure the Burden Resistane !RB"#

1. Short-circuit of the secondary winding of the 3 current transformers (seeabove).

2. Open the current circuit by inserting the test bloc

3. !onnect the current test set in the test bloc (phase " neutral).

#. $n%ect a current (1&) and measure the voltage at the terminals of theresistor !ircuitry.

'. !alculate the burden resistance by using the following e*uation+ , measured $ in%ected

I$%"ma&'%$ %$ p"epa"'$( &)e PSL:

• /10 20 3 contacts. ot needed to assign in the S/. hese contacts

were dedicatedly for any trip.


8/18

• se the signal 4rip567 in 4&8 gate7 with the 4internal trip7 for the

9: tripping circuit other than the ;rst three contacts. 8onone signal

Testin& o( the Bus)ar *rotetin& sheme P740#

• &fter completing the uploading process0 chec all the u


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• efore starting the in%ection0 mae the circuitary fault $8H1 time delay

to :II Secs JGaCK to avoid locing.

• Inject the current in the PU under test for AN phase. Increase the currentgradually and check the pickup of the ID>2 element. Like this you can

check in all the Phases as !ell as all feeders e"cept #us coupler.

• $or %us coupler PU alone it is not possi#le to check the differentialpickup &ircuitary fault and Internal L%%. %ecause the %us #ar protection&U !on't the %us coupler current in the check (one.

• )e ha*e to take some other feeder for reference !ith the #us coupler fortesting the #us coupler PU.


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• And for +aking the %us#ar timing ID>2 threshold Inject t!o times of theID>2 threshold and measure the time.

• Once the relay operated, the fault recorder will show only the check

zone differential current and Bias current only. As check zone willonly decide the final tripping of Busbar. Zone differential may appearon isolator discrepancy also.

• Fault recorder value will always show you in rms value only .!value.

"ircuitary fault pickup checks#

• Like e"plained earlier connect the test set as sho!n a#o*e. Increase

the current once the ID>, reached circuitary fault !ill operate.

• &ircuitary fault !ill signal !ill #e generated only in &entral unit. -ofeed#ack to #e taken from &entral unit only. %ut as far as %us#ar ID>2threshold &U !ill generate trip signal to the PU also. -o feed#ack can#e taken from the PU !hich !e are testing.

• nce the ID>, threshold operated it !ill #lock that particular (one in!hich your PU has #een connected /0".%us1, or %us12. $or #lockingalso you ha*e to set it in 3%us#ar ption menu4. It !ill #e *isi#le onlyif it has #een ena#led in 3configuration menu4.

• Inject t!o times of ID>, threshold current to measure the timing of&ircuitary fault.

Bias $esting#

• $or checking the %ias 2 feeder PU to #e taken. -elect that t!o PU's inthe same #us. 5i*e the close status of %us isolator and #reaker.


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• +he relay !ill operate in the coloured region. $or carrying out the slope

checks #ias current shall #e maintained constant through out the testand ramping #oth the currents injected 6one current increasing andother current decreasing7 !ith same steps si(e.

• +he #ias test point 8I#ias t' shall #e calculated as #elo!

ID>2 9 k : I#ias ;I#ias ; 9 6ID>27 < k.

.• I#ias t should #e more than I#ias ; for testing the slope.• Inject AN phase current I, at = to PU, and AN phase current I2 at

,?= to PU2.

• $i" the #ias current at 8I #ias t' and start ramping I, in positi*e directionand I2 in negati*e direction !ith same step si(e.


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• nce the differential current is entered into the operating region thescheme !ill operate on %us #ar differential function i.e. !hen thefollo!ing conditions satisfied a77 I diff > Is @ k : ID>2 #77 Idiff > ID > 2.

• +he slope of the operation shall #e calculated #y using the follo!ing

euationB 6I diff operated7 < I #ias ;.

%BB &rotections#

• +here are t!o types of &% $ail functions in the scheme. a77 Internal &% fail #77 0"ternal &% fail.

• Detection of &% fail shall #e !ith under current IC in amps internal re1trip time delay 6t#f,7 internal #ack trip time delay 6t#f27 e"ternal re1triptime delay 6t#f7 and e"ternal #ack trip time delay 6t#fE7 in msec.

'nternal (etrip %BB pickup#

• Feep the settings as t#f,9G= msecs.

• &onfigure the output contact !hich !e are taking for feed#ack forinternal retrip signal in the P-L.

• -elect the PU in any one #us. Increase the current until the ID>2current threshold Feep on increase the current until the kit stops. $irstthe relay !ill operate on %us#ar Protection and then #ecause ofcontinuous current feed more than the under current thresholdInternal L%% signal !ill generate. Heasure the time it should #e G=msecs ,=J.

'nternal Back trip %BB &ickup#

• Feep the settings as t#f292== msecs.

• &onfigure the output contact !hich !e are taking for feed#ack for3&%$ Internal %ack +rip4 signal in the P-L.

•

-elect the PU in any one #us. Increase the current until the ID>2current threshold Feep on increase the current until the kit stops. $irstthe relay !ill operate on %us#ar Protection and then #ecause ofcontinuous current feed more than the under current thresholdInternal L%% signal !ill generate. Heasure the time it should #e2== msecs ,=J.


13/18

)*ternal (etrip %BB &ickup#

• Feep the settings as t#f9G= msecs.

• &onfigure the output contact !hich !e are taking for feed#ack30"ternal retrip A4 for K1ph 30"ternal retrip %4 for 1ph 0"ternal retrip&4 for %1ph and 30"ternal trip 1ph4 for three phase initiation signal inthe P-L.

• -elect the PU in any one %us. Initiate the P+ !hich you ha*econfigured for e"ternal initiation and then inject the current more thanthe under current threshold. %elo! the threshold it shouldn't operate.Heasure the +ime delay #y gi*ing t!ice the under current threshold!ith same P+ energi(ed condition. Heasure the time it should #eG= msecs ,=J.

)*ternal Backup %BB &ickup#

• Feep the settings as t#fE92==msecs.

• &onfigure the output contact !hich !e are taking for feed#ack as 3&%$0"ternal %ack trip4 in the P-L.

• -elect the PU in any one %us. Initiate the P+ !hich you ha*econfigured for e"ternal initiation and then inject the current more thanthe under current threshold. %elo! the threshold it shouldn't operate.Heasure the +ime delay #y gi*ing t!ice the under current threshold!ith same P+ energi(ed condition. Heasure the time it should #e2== msecs ,=J.

$opology checks in case of Feeders#

• &lose the isolator of one feeder in %us1, and #reaker and close theIsolator of another feeder in the same #us !ith the #reaker. Feep theall other feeder should #e in open conditions / #oth isolators and#reakers

• nce you select these t!o feeders in %us1, check the 3+opology 24menu in the central unit for current node , /Mone1, only these t!ofeeders should selected.

• Inject the same amount of magnitude in #oth the PU's. Inject I, currentin one PU at an angle = and Inject I2 current in another PU at an angle


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of ,?=. Inject the current more than the ID>2 threshold. Increase theID>, time delay to ma"imum to a*oid #locking.

• #ser*e that 3N4 tripping is issued #y &U. &heck the Heasurementmenu in the central unit. 3Heasurement ,4 sho!s the check (one

differential and %ias current and 3Heasurement 24 sho!s the Monedifferential and %ias current. +here should not #e any differentialcurrent in the Heasurement , and Heasurement 2 also. If thedifferential current is Mero then the +opology for these t!o feeders isF.

$opology checks incase of Bus coupler# +Only in single "$arrangement

• &lose the isolator of one feeder in %us1, and #reaker and close theIsolator of another feeder in the %us12 !ith the #reaker. And also close

the %us coupler %oth the %us isolator and #reaker. Feep the all otherfeeder should #e in open conditions /#oth isolators and #reakers.

• Assume that the %us coupler &+ location is on %us1, side in our case.

• Inject the I, current in %us 1, side PU at an angle of =and Inject the I2current of same magnitude in #oth PU of series connection /%us12 sidePU and %us coupler PU at an angle of ,?=.

• -o measure the current flo! in %us1, side PU %us coupler PU and in%us12 side PU are in same magnitude.

• +hen measure the differential current in %oth the Henus of central unit.

. 3Heasurement ,4 and in 3Heasurement 24. If the differential current isMero then the +opology for these t!o feeders !ith the %us coupler isF.

$opology checks incase of Bus coupler# +-ouble "$ arrangement.

• &lose the isolator of one feeder in %us1, and #reaker and close theIsolator of another feeder in the %us12 !ith the #reaker. And also closethe %us coupler %oth the %us isolator and #reaker. Feep the all otherfeeder should #e in open conditions /#oth isolators and #reakers.

• Inject the current I, in %us 1, side feeder PU and in %us coupler PU/%us1, side at an angle of =. Inject the I2 current in %us12 side feederPU and in %us coupler PU /%us12 side at an angle of ,?=.


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• -o measure the current flo! in %us1, side PU %us coupler %oth %us1,and %us12 side PU and in %us12 side PU are in same magnitude.

• +hen measure the differential current in %oth the Henus of central unit. 3Heasurement ,4 and in 3Heasurement 24. If the differential current is

Mero then the +opology for these t!o feeders !ith the %us coupler isF.

$opology checks incase of $ransfer Bus coupler# +&rotected$ransfer Bus

• &lose the +ransfer Isolator of particular feeder !hich you !ant totransfer and open all other %us isolator and #reaker of that #ay. After

that &lose the third isolator of +ransfer #ay and &lose the %us1, Isolatorand %reaker of the same +ransfer %ay. Feep all other %ay isolator inopen condition.

• +hen +ake another feeder in the same %us1, #y closing the Isolator and%reaker.

• Inject the current I, in the Hain #ay PU !hich !as transferred no! andalso in the +ransfer #ay PU in series at an angle of = and inject currentI2 in the another feeder taken in the same %us1, at an angle of ,?=.

• -o measure the current flo! in Hain #ay PU +ransfer %ay PU andanother feeder on the same %us1, side PU are in same magnitude.

• +hen measure the differential current in %oth the Henus of central unit.

3Heasurement ,4 and in 3Heasurement 24. If the differential current isMero then the +opology for these t!o feeders !ith the %us coupler isF.

$wo stage tripping checks in Bus coupler +-ouble "$ arrangement.

• )hile Dra!ing the +opology !e ha*e to create the Oirtual #reaker incase of 2 &+ arrangements in the %us coupler. As #ecause PU's to #eassigned per #reaker.

)*ample $opology#


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• Harked portion !ill #e the *irtual region ho!e*er physically only one#reaker is a*aila#le.

• +his !e are doing #asically to sa*e the one full #us tripping if a faultoccurs in the %us coupler.

• -uppose if a fault occurs #et!een #us coupler %us1, &+ and %uscoupler #reaker. It has to trip only the %us1,.$eeders connected to %us12should #e sta#le.

• In the same !ay If a fault occurs #et!een #us coupler %us12 &+ and%us coupler #reaker. It has to trip only the %us12. $eeders connected to%us1, should #e sta#le.

• If a $ault occurs in the %us1, %us1, side %us coupler PU should operateand if a fault occurs in the %us12 %us12 side %us coupler PU shouldoperated.

• +his type of two stage tripping will always be time delayed trip. -till it!ill sa*e one full #us.


17/18

imulation of two stage tripping in -ouble "$ arrangement#

• +ake t!o feeders and #us coupler in picture and keep all other feederIsolator and #reaker to #e open. -o totally four PU's !ill come in Picture.

ne !ill as incomer in %us1, and other !ill #e as outgoing in %us12 and%us coupler in closed condition.

• In P-L &onfigure one output contact for 3+rip ?%% (one14 in the centralunit.

• In the micron configure the first input for K1PQ trip.

• &onnect the K1Ph circuit from omicron to the %us1, side PU and also in%us coupler PU /%us1, side.

• &onnect the 1PQ circuit from omicron to the %us12 side PU and also in%us coupler PU /%us12 side. Neutral point to #e shorted on #oth the #ussides.


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• Inject the K1PQ current and 1PQ current of same magnitude #ut inopposite direction /,?=. K1PQ current !ill go in to %us1, side PU and in%us coupler PU/%us1, and 1PQ current !ill go in to %us12 side PU and in

%us coupler PU/%us12 side.

• &heck the +opology (one has #een generated in the &entral unit3+opology 2 menu4. %us1, feeder !ill ha*e to sho! in current node1,. %us12 feeder !ill ha*e to sho! in current node12 and %us coupler PU has tosho! in current node1.

• Increase the K1PQ current once until the Mone1 operates and trip the%us coupler #reaker first. 3 +rip ? %% Mone4 signal has already takenfrom the &U. nce you got this feed #ack cut $$ the 1PQ current sothat HI&KN kit 1PQ current !ill get stopped. Mone 12 has #een

segregated from the $ault.

• &ontinuously feed the K1PQ current once the %us coupler #reaker opensMone !ill also segregated. No! the Mone1, region !ill e"tend up to the%reaker. -o #ecause of the continuous current Mone1, !ill operate all thePU's connected in %us1,.

• %ut for this +ripping time of Mone1 @ +opology refreshing time @ Mone1,tripping time all together it !ill take near a#out ,==msecs to clear the fault.

p740 testing procedure

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