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PUB 51079
D64RP14 SERIES A2 DIGITAL GROUND FAULT RELAY
Revision 1
May, 2005
Page 10
Figure 1 shows the D64RP14 using its built-in current transformer in conjunction with a NGR and a
typical connection of a circuit breaker with a shunt trip coil (ST). Pulsed Trip Auto Reset operating
mode has been selected. Comparing the operating mode and the relay contact states in Table 2, it can
be seen that the N.O. contact, terminals 13 and 14, would be used for the shunt trip coil. The
D64RP14 will reset automatically as soon as the ground fault current is interrupted by the tripping
action of the circuit breaker.
Figure 2 shows the D64RP14 using an external current transformer (C311CT 500:1 ratio) and a typical
connection of an ac motor starter coil (1M). Non-Failsafe operating mode has been selected.
Comparing the operating mode and the output relay contact states in Table 2, it can be seen that the
N.C. contact, terminals 11 & 12, would be used for the starter coil circuit and the N.O. contact,
terminals13 and 14, would control the external red TRIP light. A manual reset is required after a
ground fault trip.
3.4.1
CONNECTING MORE THAN ONE D64RP14 TO REMOTE TEST/RESET
Up to 5 D64RP14 relays in the same enclosure may share a common remote Test/Reset button.
Connect one terminal of the button to terminal R2 of
one
of the units, and connect the other terminal of
the button to terminals R1 of
all
the units in parallel.
4.
CATALOG NUMBERS
D64RP14
Ground Fault Relay with built-in 1.1” (28mm) CT, 24 – 240 Volts ac or dc control
voltage, for use on 660 Volts maximum, 50/60 Hz power system.
C311CT8
Zero sequence current transformer, 1.1" window
C311CT1
Zero sequence current transformer, 1.8" window
C311CT9
Zero sequence current transformer, 2.56" window
C311CT2
Zero sequence current transformer, 3.5" window
C311CT5
Zero sequence current transformer, 5.7" window
C311CT6
Zero sequence current transformer, 9.45" window
C311CT3
Split core zero sequence current transformer, 5.9" x 6.7" window
C311CT4
Split core zero sequence current transformer, 4" x 13.8" window
For mounting dimensions and additional information on C311CT current transformers refer to the
current Cutler-Hammer catalog.
5.
TECHNICAL SPECIFICATION
Control Voltage (non-isolated)............................................................................. 24 – 240 Volts ac or dc
Power consumption .................................................... proportional to voltage: 0.15 W @ 24 V ac/dc
1.5 W @ 240 V ac/dc
Operating voltage tolerance............................................. 80% to 110% of rated voltage 24 -32 V ac
55% to 110% of rated voltage 32 – 240 V ac
80% to 110% of rated voltage 24 – 240 V dc
Under voltage tolerance (no impaired operation) ................. withstands loss of supply up to 100 ms
Power Up Time ....................................................................................................... 500 milliseconds
Maximum System Voltage & Frequency............................................................660 Volts ac, 45 to 65 Hz
The D64RP14 may be applied on higher voltage circuits providing an external current transformer is
used and the power conductors are insulated for the system voltage.