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GEK-45404
3
DESCRIPTION
These are single-phase, sensitive overvoltage relays of the induction disk construction. They are
equipped with a time dial so as to provide adjustable time delay in their operation. The relays are
principally applicable for sensitive overvoltage ground detection for high-impedance grounded
generators or for ungrounded power systems. The differences among the four relays are as indicated
in Table A below. Each relay is mounted in a standard size S1 drawout case and the outline and
panel drillings are shown in Figs. 14 and 15; Fig. 13 shows the outline for an external capacitor when
used. The internal connections of the relays are indicated in the table. Each relay contains a target
seal-in unit that is used to protect the relay main contacts and control spring from damage due to
breaker-trip current.
TABLE A
CONTINUOUS
RATING**
(VOLTS)
PICKUP
RANGE,
VOLTS
TAPS CONTACTS
INTERNAL
CONNECTIONS
FIGURE
IAV51D 115 10-40
199 16-64 YES 1NO 1
345 28-112
IAV51K 67 5.4-20 YES 1NO 2
IAV52C 115 9.2
199 16 NO 2NO* 3
345 28
IAV52D 199 16-64 YES 2NO* 4
IAV52K 67 5.4-20 YES 2NO* 5
* The two normally-open contacts have a common connection; refer to the internal connections of
the relay.
** All relays have a 360 volt 10 second rating.