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8/20/2019 CONTROL CIRCUITS AND DEVICE NUMBERS.ppt
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1. One-line diagram of the system or area involved
2. Impedances and connections of power equipment, systemfrequency, voltage level and phase sequence
3. Eisting schemes
!. Operating procedures and practices a"ecting protection#. Importance of protection required and maimum allowed
clearance times
$. %ystem fault studies
&. 'aimum load and system swing limits
(. )*s and +*s locations, connections and ratios
. uture epansion epectance
1. /ny special considerations for application.
Information Required to ApplyProtection
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One 0ine iagram
• on-dimensioned diagram showinghow pieces of electrical equipmentare connected
• %implication of actual system
• Equipment is shown as 4oes, circlesand other simple graphic sym4ols
• %ym4ols should follow /%I or IE)conventions
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1-0ine %ym4ols 516
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/%I )3&-2 eviceum4ers
21 Distance Relay25 Synchronizing Device
27 Undervoltage Relay
32 Directional Power Relay
49 her!al Relay
5" #nstantaneo$s %verc$rrent Relay
51 &' i!e %verc$rrent Relay
52 &' 'irc$it (rea)er
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/%I )3&-2 eviceum4ers
59 %vervoltage Relay*7 &' Directional %verc$rrent
72 D' 'irc$it (rea)er
7* D' %verc$rrent Relay
79 &' Reclosing Relay
+1 ,re-$ency Relay
+* .oc)o$t Relay
+7 Di//erential Relay
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a 4 c 7hase sequence a-4-c
/) 8us
#1-
#1-/#1-) #1-8
#2
#19 *ime overcurrent relay#29 /) circuit 4rea:er
7 r o t e c t e d
0 i n e
a
c
4
)*
/) Elementary iagram
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a 4 c 7hase sequence a-4-c
/) 8us
#1-
#1-/#1-) #1-8
#2
#19 *ime overcurrent relay
#29 /) circuit 4rea:er
7 r o t e c t e d
0 i n e
a
c
4
)*
/) Elementary iagram
*O) phase relays#1-/, #1-8, and #1-)should send trip signal
to 4rea:er #2
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a 4 c 7hase sequence a-4-c
/) 8us
#1-
#1-/#1-) #1-8
#2
#19 *ime overcurrent relay
#29 /) circuit 4rea:er
7 r o t e c t e d
0 i n e
a
c
4
)*
/) Elementary iagram
*O) ground relay#1- ;set sensitively<should send trip signal
to 4rea:er #2
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=elay operating coil=elay contacts
#1-/
#1-/#1-/
s
s
#2
#2a
#1-8
#1-8#1-8
s to #1-)and #1-
s
*)
) Elementary iagram
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=emar:s
• *he elementary diagrams aredrawn for electromechanical relays 0 *he auiliary relay mar:ed with s is
the seal-in or contact switch 0 *his is not usually needed with solid-
state relays, 4ut the relay must latchin the trip position
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)onventional contactpositions
• )onvention9 contacts are shown inthe de-energi>ed or non-operatedposition
0 #2a is auiliary contact that is insame position as the 4rea:er
0 #24 is auiliary contact that is in theopposite position as the 4rea:er
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=elay operating coil=elay contacts
#1-/
#1-/#1-/
s
s
#2
#2a
#1-8
#1-8#1-8
s to #1-)and #1-
s
*)
) Elementary iagram
%hows the operated condition for a faultproducing a trip signal to the 4rea:ertrip coil #2 *)
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=elay operating coil=elay contacts
#1-/
#1-/#1-/
s
s
#2
#2a
#1-8
#1-8#1-8
s to #1-)and #1-
s
*)
) Elementary iagram
%hows the operated condition for a faultproducing a trip signal to the 4rea:ertrip coil #2 *), with relay latched
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=elay operating coil=elay contacts
#1-/
#1-/#1-/
s
s
#2
#2a
#1-8
#1-8#1-8
s to #1-)and #1-
s
*)
) Elementary iagram
/fter 4rea:er trips, #2a opens, whichunlatches the circuit, when relay no longersees the fault, #1-/ and #1-8 will open
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