IEEE Standard C37.2-2008: Protective Relay Number DEVICE NUMBER
FUNCTION
DEFINITION
Master Element
The initiating e!i"e# s$"h as a "%ntr%l s&it"h# et"'# that ser!es# either ire"tl( %r thr%$gh s$"h )ermissi!e e!i"es as )r%te"ti!e an time*ela( rela(s# t% )la"e e+$i)ment in %r %$t %, %)erati%n'
Time*ela( Starting %r Cl%sing Rela(
A e!i"e &hi"h ,$n"ti%ns t% gi!e a esire am%$nt %, time ela( .e,%re %r a,ter an( )%int %, %)erati%n in a s&it"hing se+$en"e %r )r%te"ti!e rela( s(stem# e/"e)t as s)e"i,i"all( )r%!ie .( e!i"e ,$n"ti%ns 0# 2- an 34 es"ri.e later'
Che"5ing %r Interl%"5ing Rela(
A rela( that %)erates in res)%nse t% the )%siti%n %, a n$m.er %, %ther e!i"es 7%r t% a n$m.er %, )reetermine "%niti%ns8 in e+$i)ment t% all%& an %)erating se+$en"e t% )r%"ee# st%)# %r )r%!ie a "he"5 %, the )%siti%n %, these e!i"es %r "%niti%ns ,%r an( )$r)%se'
Master "%nta"t%r
A e!i"e# generall( "%ntr%lle .( e!i"e ,$n"ti%n 1 %r the e+$i!alent an the re+$ire )ermissi!e an )r%te"ti!e e!i"es# that ser!es t% ma5e an .rea5 the ne"essar( "%ntr%l "ir"$its t% )la"e e+$i)ment int% %)erati%n $ner the esire "%niti%ns an t% ta5e it %$t %, %)erati%n $ner a.n%rmal "%niti%ns'
St%))ing De!i"e
A "%ntr%l e!i"e $se )rimaril( t% sh$t %&n e+$i)ment an h%l it %$t %, %)erati%n' 7This e!i"e ma( .e man$all( %r ele"tri"all( a"t$ate# .$t ite/"l$es the ,$n"ti%n %, ele"tri"al l%"5%$t :see e!i"e ,$n"ti%n 2; %n a.n%rmal "%niti%ns'8
2
Starting Cir"$it Brea5er
A e!i"e &h%se )rin"i)al ,$n"ti%n is t% "%nne"t a ma"hine t% its s%$r"e %, starting !%ltage'
3
Rate %, Change Rela(
A rela( that ,$n"ti%ns %n an e/"essi!e rate* %,*rise %, "$rrent'
C%ntr%l P%&er Dis"%nne"ting De!i"e
A is"%nne"ting e!i"e# s$"h as a 5ni,e s&it"h# "ir"$it .rea5er# %r )$ll*%$t ,$se .l%"5# $se ,%r the )$r)%se %, res)e"ti!el( "%nne"ting an is"%nne"ting the s%$r"e %, "%ntr%l )%&er t% an ,r%m the "%ntr%l .$s %r e+$i)ment'
1
-
6
0
9
TYPICAL USES
Use ,%r )r%!iing a time*ela( ,%r re* trans,er .a"5 t% the n%rmal s%$r"e in an a$t%mati" trans,er s"heme'
IEEE Standard C37.2-2008: Protective Relay Number NOTE: C%ntr%l
)%&er is "%nsiere t% in"l$e a$/iliar( )%&er that s$))lies s$"h a))arat$s as small m%t%rs an heaters'
Re!ersing De!i"e
A e!i"e that is $se ,%r the )$r)%se %, re!ersing a ma"hine ,iel %r ,%r )er,%rming an( %ther re!ersing ,$n"ti%ns'
Unit Se+$en"e S&it"h
A s&it"h that is $se t% "hange the se+$en"e in &hi"h $nits ma( .e )la"e in an %$t %, ser!i"e in m$lti)le*$nit e+$i)ment'
11
M$lti,$n"ti%n De!i"e
A e!i"e that )er,%rms three %r m%re "%m)arati!el( im)%rtant ,$n"ti%ns that "%$l %nl( .e esignate .( "%m.ining se!eral %, these e!i"e ,$n"ti%n n$m.ers' All %, the ,$n"ti%ns )er,%rme .( e!i"e 11 shall .e e,ine in the ra&ing legen %r e!i"e ,$n"ti%n e,initi%n list' NOTE: I, %nl( t&% relati!el( im)%rtant ,$n"ti%ns are )er,%rme .( the e!i"e# it is )re,erre that .%th ,$n"ti%n n$m.ers .e $se'
1-
O!ers)ee De!i"e
Us$all(# a ire"t*"%nne"te s)ee s&it"h that ,$n"ti%ns %n ma"hine %!ers)ee'
S(n"hr%n%$s* s)ee De!i"e
A e!i"e s$"h as a "entri,$gal*s)ee s&it"h# a sli) ,re+$en"( rela(# a !%ltage rela(# an $ner"$rrent rela(# %r an( %ther t()e %, e!i"e that %)erates at a))r%/imatel( the s(n"hr%n%$s s)ee %, a ma"hine'
Uners)ee De!i"e
A e!i"e that ,$n"ti%ns &hen the s)ee %, a ma"hine ,alls .el%& a )re*etermine !al$e'
19
S)ee %r Fre+$en"(* Mat"hing De!i"e
A e!i"e that ,$n"ti%ns t% mat"h an h%l the s)ee %r ,re+$en"( %, a ma"hine %r a s(stem e+$al t%# %r a))r%/imatel( e+$al t%# that %, an%ther ma"hine# s%$r"e# %r s(stem'
12
Data C%mm$ni"ati%ns De!i"e
F%r "%mm$ni"ati%n s(stem a))li"ati%n'
4
1<
16
10
13
Top
Sh$nting %r Dis"harge S&it"h'
A s&it"h that ser!es t% %)en %r "l%se a sh$nting "ir"$it ar%$n an( )ie"e %, a))arat$s 7e/"e)t a resist%r8# s$"h as a ma"hine ,iel# a
IEEE Standard C37.2-2008: Protective Relay Number ma"hine armat$re# a "a)a"it%r# %r a rea"t%r' NOTE: This e/"l$es e!i"es that )er,%rm s$"h sh$nting %)erati%ns as ma( .e ne"essar( in the )r%"ess %, starting a ma"hine .( e!i"es 2 %r 0- 7%r their e+$i!alent8 an als% e/"l$es e!i"e ,$n"ti%n 36 that ser!es ,%r the s&it"hing %, resist%rs' A""elerating %r De"elerating De!i"e'
A e!i"e that is $se t% "l%se %r "a$se the "l%sing %, "ir"$its that are $se t% in"rease %r e"rease the s)ee %, a ma"hine'
14
Starting t% R$nning Transiti%n Timer
A e!i"e &hi"h %)erates t% initiate %r "a$se the a$t%mati" trans,er %, a ma"hine ,r%m the starting t% the r$nning )%&er "%nne"ti%n'
-<
Ele"tri"all( O)erate Val!e 7s%len%i !al!e8
An ele"tri"all( %)erate# "%ntr%lle# %r m%nit%re !al!e $se in a ,l$i# air# gas# %r !a"$$m line'
Distan"e Rela(
A e!i"e &hi"h ,$n"ti%ns &hen the "ir"$it amittan"e# im)ean"e %r rea"tan"e in"reases %r e"reases .e(%n )reetermine limits' It has three 768 =%nes %, )r%te"ti%n# >%ne*1# >%ne*- an >%ne*6'
E+$ali=er Cir"$it Brea5er
A .rea5er that ser!es t% "%ntr%l %r ma5e an .rea5 the e+$ali=er %r the "$rrent*.alan"ing "%nne"ti%ns ,%r a ma"hine ,iel# %r ,%r reg$lating e+$i)ment# in a m$lti)le*$nit installati%n'
Tem)erat$re C%ntr%l De!i"e
A e!i"e &hi"h ,$n"ti%ns t% raise %r t% l%&er the tem)erat$re %, a ma"hine %r %ther a))arat$s# %r %, an( mei$m# &hen its tem)erat$re ,alls .el%& %r rises a.%!e# a )reetermine le!el'
V%lts )er ?ert= Rela(
A rela( that ,$n"ti%ns &hen the rati% %, !%ltage t% ,re+$en"( e/"ees a )reset !al$e' The rela( ma( ha!e an instantane%$s %r a time "hara"teristi"'
1
-1
--
-6
-0 -9
S(n"hr%ni=ing %r s(n"hr%nism "he"5 e!i"e
Use t% trans,er a re$"e !%ltage star ,r%m starting t% r$nning'
F%r transmissi%n lin )r%te"ti%n
Use as a therm%sta "%ntr%l s)a"e heate %$t%%r e+$i)ment'
A e!i"e &hi"h %)erates &hen t&% a" In a "l%se transiti% "ir"$its are &ithin the esire limits %, .rea5er trans,er# a ,re+$en"(# )hase angle %r !%ltage# t% rela( is $se t% ens$ )ermit %r "a$se the )aralleling %, these t&% t&%*s%$r"es are "ir"$its' s(n"hr%ni=e .e,%re )aralleling' Use ,%r
IEEE Standard C37.2-2008: Protective Relay Number ,eeer )r%te"ti%n.
-2
-3
-
-4
6<
61
A))arat$s Thermal De!i"e
A e!i"e that ,$n"ti%ns &hen the tem)erat$re %, the )r%te"te a))arat$s 7%ther than the l%a "arr(ing &inings %, ma"hines an trans,%rmers as "%!ere .( e!i"e ,$n"ti%n n$m.er 048 %r %, a li+$i %r %ther mei$m e/"ees a )reetermine !al$e@ %r &hen the tem)erat$re %, the )r%te"te a))arat$s %r %, an( mei$m e"reases .el%& a )reetermine !al$e' Use t% initiate an a$t%mati" trans,er &hen a )rimar( s%$r %, )%&er is l%st'
Uner V%ltage Rela(
A e!i"e &hi"h ,$n"ti%ns %n a gi!en !al$e %, $ner!%ltage'
Flame Dete"t%r
A e!i"e that m%nit%rs the )resen"e %, the )il%t %r main ,lame in s$"h a))arat$s as a gas t$r.ine %r a steam .%iler'
Is%lating C%nta"t%r
A e!i"e that is $se e/)ressl( ,%r is"%nne"ting %ne "ir"$it ,r%m an%ther ,%r the )$r)%ses %, emergen"( %)erati%n# maintenan"e# %r test'
Ann$"iat%r Rela(
Use t% rem%tel( ini"ate that a )r%te"ti!e rela( has ,$n"ti%ne# %r that a A n%n*a$t%mati"all( reset e!i"e that gi!es "ir"$it .rea5er has a n$m.er %, se)arate !is$al ini"ati%ns tri))e' T()i"all(# $)%n the ,$n"ti%ning %, )r%te"ti!e e!i"es# me"hani"al r%) t an &hi"h ma( als% .e arrange t% )er,%rm ann$n"iat%r )anel is a l%"5%$t ,$n"ti%n' $se'
Se)arate E/"itati%n De!i"e
A e!i"e that "%nne"ts a "ir"$it# s$"h as the sh$nt ,iel %, a s(n"hr%n%$s "%n!erter# t% a s%$r"e %, se)arate e/"itati%n $ring the starting se+$en"e'
6-
Dire"ti%nal P%&er Rela(
66
P%siti%n S&it"h
A rela( &hi"h ,$n"ti%ns %n a esire !al$e %, )%&er ,l%& in a gi!en ire"ti%n# %r $)%n re!erse )%&er res$lting ,r%m ar" .a"5 in the an%e %r "ath%e "ir"$its %, a )%&er re"ti,ier'
Use t% )re!ent re! )%&er ,r%m ,eeing $)stream ,a$lt' O,te $se &hen )rimar( .a"5$) generati%n i $tili=e in a ,a"ilit('.
A e!i"e &hi"h ma5es %r .rea5s "%nta"t &hen the main e!i"e %r )ie"e %, a))arat$s# &hi"h has n% e!i"e ,$n"ti%n
Use t% ini"ate the )%siti%n %, a ra&%$ "ir"$it .rea5er 7TOC
IEEE Standard C37.2-2008: Protective Relay Number n$m.er# rea"hes a gi!en )%int'
Master Se+$en"e De!i"e
A e!i"e s$"h as a m%t%r*%)erate m$lti"%nta"t s&it"h# %r the e+$i!alent# %r a )r%gramming e!i"e# s$"h as a "%m)$ter# that esta.lishes %r etermines the %)erating se+$en"e %, the ma%r e!i"es in e+$i)ment $ring starting an st%))ing %r $ring %ther se+$ential s&it"hing %)erati%ns'
Br$sh*%)erating %r Sli)*ring Sh%rt*"ir"$iting De!i"e
A e!i"e ,%r raising# l%&ering# %r shi,ting the .r$shes %, a ma"hine@ sh%rt*"ir"$iting its sli) rings@ %r engaging %r isengaging the "%nta"ts %, a me"hani"al re"ti,ier'
62
P%larit( %r P%lari=ing V%ltage De!i"e'
A e!i"e that %)erates# %r )ermits the %)erati%n %,# an%ther e!i"e %n a )reetermine )%larit( %nl( %r that !eri,ies the )resen"e %, a )%lari=ing !%ltage in e+$i)ment'
63
Uner"$rrent %r Uner)%&er Rela(
A rela( &hi"h ,$n"ti%ns &hen the "$rrent %r )%&er ,l%& e"reases .el%& a )reetermine !al$e'
6
A e!i"e &hi"h ,$n"ti%ns %n e/"essi!e .earing tem)erat$re# %r %n %ther a.n%rmal me"hani"al "%niti%ns# s$"h as $n$e Bearing &ear# &hi"h ma( e!ent$all( res$lt in Pr%te"ti!e De!i"e e/"essi!e .earing tem)erat$re'
60
Top
69
Me"hani"al C%niti%n M%nit%r
A e!i"e that ,$n"ti%ns $)%n the %""$rren"e %, an a.n%rmal me"hani"al "%niti%n 7e/"e)t that ass%"iate &ith .earings as "%!ere $ner e!i"e ,$n"ti%n 68# s$"h as e/"essi!e !i.rati%n# e""entri"it(# e/)ansi%n# sh%"5# tilting# %r seal ,ail$re'
0<
Fiel Rela(
A rela( that ,$n"ti%ns %n a gi!en %r a.n%rmall( l%& !al$e %r ,ail$re %, ma"hine ,iel "$rrent# %r %n an e/"essi!e !al$e %, the rea"ti!e "%m)%nent %, armat$re "$rrent in an a" ma"hine ini"ating a.n%rmall( l%& ,iel e/"itati%n'
01
Fiel Cir"$it Brea5er
A e!i"e &hi"h ,$n"ti%ns t% a))l(# %r t% rem%!e# the ,iel e/"itati%n %, a ma"hine'
R$nning Cir"$it Brea5er
A e!i"e &h%se )rin"i)al ,$n"ti%n is t% "%nne"t a ma"hine t% its s%$r"e %, r$nning %r %)erating
64
0-
s&it"h8'
M%t%r )r%te"ti%n rel
M%t%r %r generat%r )r%te"ti%n rela(
enerat%r a))li"ati%
IEEE Standard C37.2-2008: Protective Relay Number !%ltage' This ,$n"ti%n ma( als% .e $se ,%r a e!i"e# s$"h as a "%nta"t%r# that is $se in series &ith a "ir"$it .rea5er %r %ther ,a$lt )r%te"ting means# )rimaril( ,%r ,re+$ent %)ening an "l%sing %, the "ir"$it' Man$al Trans,er %r Sele"t%r De!i"e
A man$all( %)erate e!i"e that trans,ers the "%ntr%l "ir"$its in %rer t% m%i,( the )lan %, %)erati%n %, the s&it"hing e+$i)ment %r %, s%me %, the e!i"es'
Unit Se+$en"e Starting Rela(
A rela( that ,$n"ti%ns t% start the ne/t a!aila.le $nit in m$lti)le*$nit e+$i)ment $)%n the ,ail$re %r n%n*a!aila.ilit( %, the n%rmall( )re"eing $nit'
Atm%s)heri" C%niti%n M%nit%r'
A e!i"e that ,$n"ti%ns $)%n the %""$rren"e %, an a.n%rmal atm%s)heri" "%niti%n# s$"h as amaging ,$mes# e/)l%si!e mi/t$res# sm%5e# %r ,ire'
02
Re!erse*)hase# %r Phase Balan"e# C$rrent Rela(
A rela( &hi"h ,$n"ti%ns &hen the )%l()hase "$rrents are %, re!erse*)hase se+$en"e# %r &hen the )%l()hase "$rrents are $n.alan"e %r "%ntain the negati!e )hase*se+$en"e "%m)%nents a.%!e a gi!en am%$nt'
M%t%r )r%te"ti%n rel
03
Phase*se+$en"e V%ltage Rela(
A rela( &hi"h ,$n"ti%ns $)%n a )reetermine !al$e %, )%l()hase !%ltage in the esire )hase se+$en"e'
Feeer )r%te"ti%n
In"%m)lete Se+$en"e Rela(
A rela( that generall( ret$rns the e+$i)ment t% the n%rmal# %r %,,# )%siti%n an l%"5s it %$t %, the n%rmal starting# %r %)erating %r st%))ing se+$en"e is n%t )r%)erl( "%m)lete &ithin a )reetermine am%$nt %, time' I, the e!i"e is $se ,%r alarm )$r)%ses %nl(# it sh%$l )re,era.l( .e esignate as 0A 7alarm8'
Ma"hine# %r Trans,%rmer# Thermal Rela(
A rela( that ,$n"ti%ns &hen the tem)erat$re %, a ma"hine armat$re# %r %ther l%a "arr(ing &ining %r element %, a ma"hine# %r the tem)erat$re %, a )%&er re"ti,ier %r )%&er trans,%rmer 7in"l$ing a )%&er re"ti,ier trans,%rmer8 e/"ees a )reetermine !al$e'
M%t%r %r trans,%rme thermal rela( a))li"ati%n
Instantane%$s O!er"$rrent# %r Rate*%,*Rise Rela(
A rela( that ,$n"ti%ns instantane%$sl( %n an e/"essi!e !al$e %, "$rrent# %r an e/"essi!e rate %, "$rrent rise# th$s ini"ating a ,a$lt in the a))arat$s %, the
Use ,%r tri))ing a "ir .rea5ers instantane%$sl( $ri a high le!el sh%rt
06
00
09
0
04 9<
IEEE Standard C37.2-2008: Protective Relay Number
"ir"$it .eing )r%te"te'
"ir"$it' Can tri) %n )hase* )hase 79<8# )hase*ne$tral 79
A rela( &ith either a e,inite %r in!erse time "hara"teristi" that ,$n"ti%ns &hen the "$rrent in an a" "ir"$it e/"ees a )reetermine !al$e
Use ,%r tri))ing a "ir"$it .rea5er a,ter time ela( $ring a s$staine %!er"$rre Use ,%r tri))ing a "ir"$it .rea5er instantane%$sl( $ri a high le!el sh%rt "ir"$it' Can tri) %n )hase 7918# ne$tral 791N8%r gr%$n 791 %!er"$rrents'
AC Cir"$it Brea5er
A e!i"e that is $se t% "l%se an interr$)t an a" )%&er "ir"$it $ner n%rmal "%niti%ns %r t% interr$)t this "ir"$it $ner ,a$lt %r emergen"( "%niti%ns'
A term a))lie t()i" t% mei$m !%ltage "ir"$it .rea5ers# %r l !%ltage )%&er "ir"$i .rea5ers'
E/"iter %r DC enerat%r Rela(
A rela( that ,%r"es the " ma"hine ,iel e/"itati%n t% .$il $) $ring starting %r that ,$n"ti%ns &hen the ma"hine !%ltage has .$ilt $) t% a gi!en !al$e'
T$rning ear Engaging De!i"e
An ele"tri"all( %)erate# "%ntr%lle# %r m%nit%re e!i"e that ,$n"ti%ns t% "a$se the t$rning gear t% engage 7%r isengage8 the ma"hine sha,t'
P%&er Fa"t%r Rela(
A rela( that %)erates &hen the )%&er ,a"t%r in an AC "ir"$it rises a.%!e %r .el%& a )reetermine !al$e'
Fiel A))li"ati%n Rela(
A rela( that a$t%mati"all( "%ntr%ls the a))li"ati%n %, the ,el e/"itati%n t% an a" m%t%r at s%me )reetermine )%int in the sli) "("le'
93
Sh%rt*"ir"$iting %r r%$ning De!i"e'
A )rimar( "ir"$it s&it"hing e!i"e that ,$n"ti%ns t% sh%rt*"ir"$it %r gr%$n a "ir"$it in res)%nse t% a$t%mati" %r man$al means'
9
Re"ti,i"ati%n Fail$re Rela(
A e!i"e that ,$n"ti%ns i, a )%&er re"ti,ier ,ails t% "%n$"t %r .l%"5 )r%)erl('
91
Top
9-
96
90
99
92
AC Time O!er"$rrent Rela(
Uner %r %!er ,re+$ a))li"ati%n $se in generating )lants'
IEEE Standard C37.2-2008: Protective Relay Number
94
O!er V%ltage Rela(
A rela( that ,$n"ti%ns %n a gi!en !al$e %, %!er!%ltage'
2<
V%ltage %r C$rrent Balan"e Rela(
A rela( that %)erates %n a gi!en i,,eren"e in !%ltage# %r "$rrent in)$t %r %$t)$t %, t&% "ir"$its'
21
A e!i"e that %)erates %n a gi!en !al$e# %r Densit( S&it"h %r a gi!en rate Sens%r %, "hange# %, gas ensit('
2-
26
20
Top 29
Use t% tri) a "ir"$it .rea5er# )r%te"ting %&nstream e+$i)m ,r%m s$staine %!er!%ltages'
A time*ela( rela( that ser!es in "%n$n"ti%n &ith the e!i"e that initiates the sh$t%&n# st%))ing# %r %)ening %)erati%n in an a$t%mati" se+$en"e'
Use in "%n$n"ti%n a -3 e!i"e t% ela( tri))ing %, a "ir"$it .rea5er $ring a .ri l%ss %, )rimar( !%lta t% )re!ent n$isan"e tri))ing'
Press$re S&it"h
A s&it"h &hi"h %)erates %n gi!en !al$es %r %n a gi!en rate %, "hange %, )ress$re'
Use t% )r%te"t a trans,%rmer $ring ra)i )ress$re rise $ring a sh%rt "ir"$i This e!i"e &ill t()i a"t t% %)en the )r%te"ti!e e!i"es a an .el%& the trans,%rmer' T()i"all $se &ith a 26* a$/iliar( rela( t% tri the "ir"$it .rea5er'
r%$n Pr%te"ti!e Rela(
A rela( that ,$n"ti%ns %n a ,ail$re %, the ins$lati%n %, a ma"hine# trans,%rmer# %r %, %ther a))arat$s t% gr%$n# %r %n ,lash%!er %, a " ma"hine t% gr%$n' NOTE: This ,$n"ti%n is n%t a))lie t% a e!i"e "%nne"te in the se"%nar( "ir"$it %, "$rrent trans,%rmers in a n%rmall( gr%$ne )%&er s(stem# &here %ther e!i"e n$m.ers &ith the s$,,i/ %r N sh%$l .e $se@ that is# 91N ,%r an a" time %!er$rrent rela( "%nne"te in the se"%nar( ne$tral %, the "$rrent trans,%rmers'
Use t% ete"t an a %n a gr%$n*,a$lt "%niti%n' In a )$lsi high resistan"e gr%$ning s(stem# a e!i"e &ill initiate t alarm'
Time*ela( St%))ing %r O)ening Rela(
%!ern%r
The assem.l( %, ,l$i# ele"tri"al# %r me"hani"al "%ntr%l e+$i)ment $se ,%r reg$lating the ,l%& %, &ater# steam# %r %ther meia t% the )rime m%!er ,%r s$"h
IEEE Standard C37.2-2008: Protective Relay Number )$r)%ses as starting# h%ling s)ee %r l%a# %r st%))ing'
22
N%t"hing %r %gging e!i"e
A e!i"e that ,$n"ti%ns t% all%& %nl( a s)e"i,ie n$m.er %, %)erati%ns %, a gi!en e!i"e# %r e+$i)ment# %r a s)e"i,ie n$m.er %, s$""essi!e %)erati%ns &ithin a gi!en time %, ea"h %ther' It als% ,$n"ti%ns t% energi=e a "ir"$it )eri%i"all( %r ,%r ,ra"ti%ns %, s)e"i,ie time inter!als# %r that is $se t% )ermit intermittent a""elerati%n %r %gging %, a ma"hine at l%& s)ees ,%r me"hani"al )%siti%ning'
23
AC Dire"ti%nal O!er"$rrent Rela(
A rela( that ,$n"ti%ns %n a esire !al$e %, AC %!er"$rrent ,l%&ing in a )reetermine ire"ti%n'
Bl%"5ing Rela(
A rela( that initiates a )il%t signal ,%r .l%"5ing %, tri))ing %n e/ternal ,a$lts in a transmissi%n line %r in %ther a))arat$s $ner )reetermine "%niti%ns# %r that "%%)erates &ith %ther e!i"es t% .l%"5 tri))ing %r t% .l%"5 re"l%sing %n an %$t*%,* ste) "%niti%n %r %n )%&er s&ings'
Permissi!e C%ntr%l De!i"e
A e!i"e that is generall( a t&%*)%siti%n man$all( %)erate s&it"h that in %ne )%siti%n )ermits the "l%sing %, a "ir"$it .rea5er# %r the )la"ing %, e+$i)ment int% %)erati%n# an in the %ther )%siti%n )re!ents the "ir"$it .rea5er t% the e+$i)ment ,r%m .eing %)erate'
Rhe%stat
A !aria.le resistan"e e!i"e $se in an ele"tri" "ir"$it &hen the e!i"e is ele"tri"all( %)erate %r has %ther ele"tri"al a""ess%ries# s$"h as a$/iliar(# )%siti%n# %r limit s&it"hes'
2
24
3<
31
Le!el S&it"h
A s&it"h that %)erates %n gi!en !al$es# %r %n a gi!en rate %, "hange %, le!el'
M%t%r )r%te"ti%n a))li"ati%ns
Use as a rem%te*l% s&it"h ,%r "ir"$it .rea5er "%ntr%l'
Use t% ini"ate a l% li+$i le!el &ithin a trans,%rmer tan5 in %rer t% sa!e trans,%rmers ,r%m l% %,*ins$lati%n ,ail$re' alarm "%nta"t is a!aila.le as a stan %)ti%n %n a li+$i l ga$ge' It is set t% "l .e,%re an $nsa,e "%niti%n a"t$all( %""$rs'
IEEE Standard C37.2-2008: Protective Relay Number
DC Cir"$it Brea5er
A "ir"$it .rea5er that is $se t% "l%se an interr$)t a " )%&er "ir"$it $ner n%rmal "%niti%ns %r t% interr$)t this "ir"$it $ner ,a$lt %r emergen"( "%niti%ns'
L%a*Resist%r C%nta"t%r
A "%nta"t%r that is $se t% sh$nt %r insert a ste) %, l%a limiting# shi,ting# %r ini"ating resistan"e in a )%&er "ir"$it@ t% s&it"h a s)a"e heater in "ir"$it@ %r t% s&it"h a light %r regenerati!e l%a resist%r %, a )%&er re"ti,ier %r %ther ma"hine in an %$t %, "ir"$it'
Alarm Rela(
A e!i"e %ther than an ann$n"iat%r# as "%!ere $ner e!i"e n$m.er 6<# &hi"h is $se t% %)erate# %r t% %)erate in "%nne"ti%n &ith# a !isi.le %r a$i.le alarm'
P%siti%n Changing Me"hanism
A me"hanism that is $se ,%r m%!ing a main e!i"e ,r%m %ne )%siti%n t% an%ther in e+$i)ment@ ,%r e/am)le# shi,ting a rem%!a.le "ir"$it .rea5er $nit t% an ,r%m the "%nne"te# is"%nne"te# an test )%siti%ns'
DC O!er"$rrent Rela(
A rela( that ,$n"ti%ns &hen the "$rrent in a " "ir"$it e/"ees a gi!en !al$e'
33
Telemetering De!i"e
A transmitter $se t% generate an transmit t% a rem%te l%"ati%n an ele"tri"al signal re)resenting a meas$re +$antit(# %r a re"ei!er $se t% re"ei!e the ele"tri"al signal ,r%m a rem%te transmitter an "%n!ert the signal t% re)resent the %riginal meas$re +$antit('
3
Phase*angle Meas$ring %r O$t*%,*Ste) Pr%te"ti!e Rela(
A rela( that ,$n"ti%ns at a )reetermine )hase angle .et&een t&% !%ltages# .et&een t&% "$rrents# %r .et&een !%ltage an "$rrent'
AC Re"l%sing Rela(
A rela( that "%ntr%ls the a$t%mati" "l%sing an l%"5ing %$t %, an AC "ir"$it interr$)ter'
3-
36
30
39
32
34
Top
Use t% a$t%mati"all re"l%se a "ir"$it .re a,ter a tri)# ass$min the ,a$lt has .een "leare a,ter the )% &as rem%!e ,r%m t "ir"$it' The re"l%ser l%"5*%$t a,ter a )reetermine am% %, ,aile attem)ts t%
IEEE Standard C37.2-2008: Protective Relay Number re"l%se'
<
Fl%& S&it"h
A s&it"h that %)erates %n gi!en !al$es# %r %n a gi!en rate %, "hange# %, ,l%&'
Fre+$en"( Rela(
A rela( that ,$n"ti%ns %n a )reetermine !al$e %, ,re+$en"( either $ner %r %!er# %r %n n%rmal s(stem# ,re+$en"( %r rate %, "hange ,re+$en"('
-
DC L%a* meas$ring Re"l%sing Rela(
A rela( that "%ntr%ls the a$t%mati" "l%sing an re"l%sing %, a " "ir"$it interr$)ter# generall( in res)%nse t% l%a "ir"$it "%niti%ns'
6
A$t%mati" Sele"ti!e C%ntr%l %r Trans,er Rela(
A rela( that %)erates t% sele"t a$t%mati"all( .et&een "ertain s%$r"es %r "%niti%ns in e+$i)ment %r that )er,%rms a trans,er %)erati%n a$t%mati"all('
O)erating Me"hanism
The "%m)lete ele"tri"al me"hanism %r ser!% me"hanism# in"l$ing the %)erating m%t%r# s%len%is# )%siti%n s&it"hes# et"'# ,%r a ta) "hanger# in$"ti%n reg$lat%r# %r an( similar )ie"e %, a))arat$s that %ther&ise has n% e!i"e ,$n"ti%n n$mher'
Carrier %r Pil%t* ire Re"ei!er Rela(
A rela( that is %)erate %r restraine .( a signal $se in "%nne"ti%n &ith "arrier"$rrent %r DC Pil%t*ire ,a$lt rela(ing'
1
0
9
2 3
L%"5ing*%$t Rela( Di,,erential )r%te"ti!e Rela(
An ele"tri"all( %)erate han# %r ele"tri"all(# reset rela( that ,$n"ti%ns t% sh$t %&n an h%l an e+$i)ment %$t %, ser!i"e %n the %""$rren"e %, a.n%rmal "%niti%ns' A )r%te"ti!e rela( that ,$n"ti%ns %n a )er"entage %r )hase angle %r %ther +$antitati!e i,,eren"e %, t&% "$rrents %r %, s%me %ther ele"tri"al +$antities'
Use t% tri) a gener "ir"$it .rea5er in th e!ent the ,re+$en"( ri,ts a.%!e %r .el% gi!en !al$e'
Use in "%n$n"ti%n )r%te"ti!e rela(s t% l%"5*%$t a "ir"$it .rea5er 7%r m$lti)le "ir"$it .rea5ers8 a,t tri)' T()i"all( re+$i t% .e man$all( rese an %)erat%r .e,%re t .rea5er "an .e re"l% Use t% )r%te"t stati e+$i)ment# s$"h as "a.le# .$s# trans,%r .( meas$ring the "$rrent i,,erential .et&een t&% )%ints' T()i"all( the $)stre anG%r %&nstream "ir"$it .rea5er &ill . in"%r)%rate int% th
IEEE Standard C37.2-2008: Protective Relay Number =%ne %, )r%te"ti%n'
4
4<
41
446
Top
40
49*44
A$/iliar( M%t%r %r M%t%r enerat%r'
A e!i"e $se ,%r %)erating a$/iliar( e+$i)ment# s$"h as )$m)s# .l%&ers# e/"iters# r%tating magneti" am)li,iers# et"'
Line S&it"h
A s&it"h $se as a is"%nne"ting# l%a* interr$)ter# %r is%lating s&it"h in an a" %r " )%&er "ir"$it' 7This e!i"e ,$n"ti%n n$m.er is n%rmall( n%t ne"essar( $nless the s&it"h is ele"tri"all( %)erate %r has ele"tri"al a""ess%ries# s$"h as an a$/iliar( s&it"h# a magneti" l%"5# et"'8
Reg$lating De!i"e
A e!i"e that ,$n"ti%ns t% reg$late a +$antit( %r +$antities#s$"h as !%ltage# "$rrent# )%&er# s)ee# ,re+$en"(# tem)erat$re# an l%a# at a "ertain !al$e %r .et&een "ertain 7generall( "l%se8 limits ,%r ma"hines# tie lines# %r %ther a))arat$s'
V%ltage Dire"ti%nal Rela(
A rela( that %)erates &hen the !%ltage a"r%ss an %)en "ir"$it .rea5er %r "%nta"t%r e/"ees a gi!en !al$e in a gi!en ire"ti%n'
V%ltage an P%&er Dire"ti%nal Rela(
A rela( that )ermits %r "a$ses the "%nne"ti%n %, t&% "ir"$its &hen the !%ltage i,,eren"e .et&een them e/"ees a gi!en !al$e in a )reetermine ire"ti%n an "a$ses these t&% "ir"$its t% .e is"%nne"te ,r%m ea"h %ther &hen the )%&er ,l%&ing .et&een them e/"ees a gi!en !al$e in the %))%site ire"ti%n'
Fiel*"hanging C%nta"t%r
A "%nta"t%r that ,$n"ti%ns t% in"rease %r e"rease# in %ne ste)# the !al$e %, ,iel e/"itati%n %n a ma"hine'
Tri))ing %r Tri)* ,ree Rela(
A rela( that ,$n"ti%ns t% tri) a "ir"$it .rea5er# "%nta"t%r# %r e+$i)ment# %r t% )ermit immeiate tri))ing .( %ther e!i"es# %r t% )re!ent immeiate re"l%s$re %, a "ir"$it interr$)ter# in "ase it sh%$l %)en a$t%mati"all( e!en th%$gh its "l%sing "ir"$it is maintaine "l%se' Use %nl( ,%r s)e"i,i" a))li"ati%ns in ini!i$al installati%ns i, n%ne %, the ,$n"ti%ns assigne t% the n$m.ers ,r%m 1 t% 40 is s$ita.le'
IEEE Standard C37.2-2008: Protective Relay Number ! - !u " - "ield # - #round or $enerator N - Neutral % & %ran'ormer
