cdg and cdd relays
TRANSCRIPT
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L
12
FiS. 1. Type
CDD21 relay n drawoutchassis
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x
INVERSE
IME
AND
EARTH
Egtorhdfu
Fnfb;
?ecting
ndConnuaication bsL
M.
S. E.
E.
NAGPUR
OVERCUBRENT
FAULTBETAYS
DIREGTIONAL
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44
Fig.
8 . Phase
aul t
re lay
connect ions
A-x
B-x
c-x
: )
Fig. 9.
Diagram
f connect ionsor type
CDD
elays
Phase
ault re lays-Ouadratureonnect ion)
Relay ogerates when
current f fows in
this
direct ion
1 0
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|
, ,
Fig.
10. Vol tage
polar ised
€ar th fau l t
d i rec t iona l un i t
connect ions
Fig.
11.
Ear th fau l t
onnect ions
Potent ia l
po lar isat ion)
Reley
opo is tos
when
cur ron t
lows in
t h i s
d i rec t ion
1 2
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t .0
0 9
4 s 6
7
I 9 1 0
Fig.
24.
MULTIPLES
PLUG SETTING
CURRENT
T i m ec u r r e n t
h a r a c t e r i s t i c
f
C D G
1 1
r e l a y
3 . 0 s e c .
e l a Y
r0
9
I
7
5
5
2 l
l
1 , 0
0 9
0.8
0.7
0 6
0 5
6
u
u
z
t
F
u
4
6
u
o
0.7
0 6
0.s
o
r .0
0.9
0.8
0.7
u o
0 5
1 . 0
0 9
0.8
0.6
0.5
U
u
z
l u
E
F
z
tr
d
G
o
z
F i g .
3
4 )
o
t a
t v
MULTIPLE9
OF
PLUG SETTING
CURRENT
4 5
6
7 8
9 l 0
25.
Time
current
charac ter is t i c
f
CDG
relay-
1 , 3
s e c
e l a Y
TIME.CURRENT
HARACTERISTIC
I N V E R S E
I M E
R E L A Y C D G I J
3
S E C .
O B.S . l 12
T I M E . C U R R E N T
H A R A C T E R I S T I C
I N V E R S E
I M E
R E L A Y
C D G I I
t . 3 S E C .
26
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vt
U
U
z
=
F
(,
z
F
t
H
o
1.0
0. 9
0. 8
0. 7
0. 6
2
3 4 S
6
7
8
9 1 0
z o
MULTIPLES
F PLUGSETTING
CURRENT
Fig. 27.
Time
current
charac ter is t i c
f
CDG
13
re lay
z
F i s . 2 6 .
3 1 5 6 7 8 9 1 0
FITJLTIPLESF
PLUGSETTING
URRENT
1 0
I
8
7
5
(
4
I
0.9,
0.8,
0. 7
0. 6
0.5
0.4
1: 0
0.9
0.8
0.7
0.6
0€
0.4
Time current
charac ter is t i c
f
CDG
12
te lay
30