INSTRUCTION
MANUAL
D64RPY2
D64RPY2 SERIES A1 DIGITAL GROUND FAULT RELAY
Pub. No. IM-
D64RPY2
Ser. A1, August, 2002
Page 3
1.
GENERAL DESCRIPTION
The
D64RPY2
is a microprocessor based ground fault relay for use on solidly grounded or resistance
grounded systems. This innovative digital electronic relay measures ground fault current using a built-in 1.1”
zero sequence current transformer (CT).
The
D64RPY2
reacts to alternating current only and will reject direct current signals. It will maintain accuracy
over a frequency range of 45 to 450Hz, making it suitable for variable frequency drive applications.
660 Volts is the maximum system operating voltage for the D64RPY2 when passing the system power
conductors through the built-in CT
The ground fault current trip level is factory set at 500 milliamps.
The response time on ground fault trip is factory set at 500 milliseconds.
The output relay has Form “C” N.O. – C. – N.C. contacts, which may be used to operate the upstream
protective device from the internal 24 Vac control (N.O.) or from a central shutoff circuit (N.C.) from the same
24 Vac source. The relay operating mode is Pulsed Output Auto Reset.
By pressing the remote Test button connected to the Blue and Purple wire leads, a functional test of the
D64RPY2 is invoked. Three seconds later the relay resets.
The D64RPY2 operates on 24 Volts ac control power.
2.
OPERATION
2.1
GLOSSARY OF TERMS
Pulsed (Trip) Auto Reset:
The output relay does not change state when control power is applied to the Black and White
wire leads.
With control voltage on the Black and White wire leads, when the measured values reach or
exceed 500 milliamps for 500 milliseconds, the output relay changes state (trips). The output
relay will remain tripped until one of the following conditions is met:
-
Three seconds after the ground fault current exceeds 500 milliamps the relay will
reset. This is, in effect, pulsed Auto Reset.
-
If the control voltage is removed by the trip action of the output relay (i.e. it operates
the shunt trip of the breaker that is providing the control voltage), the relay will reset
after 20 milliseconds. This is, in effect, Auto Reset.
-
If the ground fault current drops below 500 milliamps or is removed by the trip action
of the breaker, the relay will reset after 20 milliseconds. This is, in effect, Auto Reset.
If the ground fault has not been cleared when control voltage is restored, the relay will trip
after 500 milliseconds, and the above cycle will be repeated.
If the ground fault has been cleared when control voltage is restored, the relay will remain
reset.
The Pulsed Trip Auto Reset mode can be used when the application calls for Auto Reset.
