GEH-1814
Voltage Relays Type IAV
8
PERCENTAGE OF VOLTAGE TO
AT WHICH RIGHT CONTACTS WERE
4
3
(/)
0
2
:z
0
u
w
(/)
-
f-
l
0
50%
20
40
60% 70% 80 90 95
60
80
1 0
TIME TO CLOSE RIGHT CONTACTS WHEN VOLTAGE IS SUDDENL
REDUCED FROM VALUE EQUAL OR GREATER THAN VOLTAGE
REQUIRED TO CLOSE LEFT CONTACT TO VALUES ON THE
TIME TO CLOSE LEFT CONTACTS WHEN VOLTAGE
SUDDENLY
I
NCREASED FROM ZERO TO VALUES
ON THE CURVE.
PERCENTAGE OF VOLTAGE TO CLOSE
LEFT CONTACTS AT WH I CH RIGHT
CONTACTS WERE SET TO CLOSE.
50%
60%
70%
80%
90%
95%
LEFT CONTACTS CLOSED
120
140
160
180
200
PER CENT OF VOLTAGE REQUIRED TO CLOSE LEFT CONTACTS
Fig.
�
Time-Voltage Curves For Type IAV53D Relay
A-C BUS
Dll
POTENTIAL
TRANSFORMERS
DEY ICE FUNCTION NUMBERS
52 - POWER CIRCUIT BREAKER
59- A-C OVERYOLTAGE RELAY, TYPE IAY51A
o -
AUXILIARY CO�TACT CLOSED WHEN BREAKER CLOSES
n
:
�m-����N
IT
WITH TARGET
fig.
5
Connection Diagram Of Type I AY51A Relays
Used For Overvoltage Protection
59
c
86
Fig.
6
I>
!AV51D
,------,
��
I
I
L
______
_J
IAV51K
,-------,
���:
I
59
3
1
I 6
R
EXTrRNAL
Is
��
: L3
C�PAciTOR
L
_______
j
�
:
DISTRIBUTION
Jl
TRANSFORMER
-
-
LEGEND
OESCRI PTION
):IRCUIT BREAKER
AC OVERVOLTAGE RELAY TYPES TAV51D
&
IAV51K
CAPACITOR
T
WITH
AUXILIARY HAND RESET RELAY
TYPE
HEA
Connection Diagram For The Type I AV51D
And I AV51K Relay
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. ElectricalPartManuals
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