Advertisement
Type IAV Undervoltage and Overvoltage Relays
GEH-12668
S
-
1
n
eo l
�
��
c
t
'--- - ,
Operot1ng
i
"--. ..
co
l
r
•
5
I
6
2
7.
Fig.
Internal
connection�,
back
view, for Type IAV51A relay
Operation
Before the relay is put in service, it should be
given a partial check to determine that factory ad
justments have not been disturbed. On relays which
have time dials, the dials will be set at zero before
the relay leaves the factory. It is necessary to change
this setting in order to open the relay contacts.
The pickup voltage should be checked on one or
more taps on relays which close contacts on increas
ing voltage. The dropout voltage should be checked
on one or more taps on relays which close contacts
on decreasing voltage.
The time-voltage curves should be checked for one
or more settings.
Recommended test connections for the above tests
are shown in Fig. 12 for the lA V51A and the lA V-
52 A. Fig. 13 shows test connections for the lA V54A
and the lA VSSA. The lA V53A can be checked for
time of closing left contacts by using connections
shown in Fig. 12, and for closing right contacts
R
c
Fig. 12.
Connectio.s for testing Types IAV51A anci1AV52A
relays, back view
10
Main
contacts
Operating
coil
5
6
8.
Fig.
Internal connections, back
view, for Type IAV52A relay
A-c supply
of correct
frequency
O
M
Synchronous
MF-2
timer type
Undervoltage
Seal-m
contacts
element
Seal-in
element
9
10
9.
Fig.
Internal connections, back view, for Type
Mmn
Seol-1�
contacts
element
�
Operatmg
coil
5
6
Fig. 10.
Internal connections, back
view, for Type IAV54A relay
except that terminal studs 9 and 10 should be used
instead of.1 and 2 (see internal connections, Fig. 9).
The relay may be tested while mounted on the
�
pan
el, eit
er from its own or another source of power,
_
by msertmg a separate testing plug in place of the
connecting plug. Or, the cradle can be drawn out and
replaced by another which has been laboratory
tested.
Fig. 13.
Connections for testing Types IAV54A anciiAV55A
relays, back view
Overvo!tage
contacts
Operating
coil
5
6
IAV53A relay
Main
Seal-in
contacts
element
Op erating
coil
5
3
2
Fig. 11.
Internal connections, bade
view, for Type IAVSSA relay
of correct
A·c supply
frequency
Synchronous
timer type
F-
Advertisement
