PUB 50412
D64RPB100 SERIES B1 DIGITAL GROUND FAULT RELAY
Revision 3
April, 2008
Page 7
3.0 – 900 Amps by passing the 5 Amp secondary of an interposing CT with a windings ratio of
500:5 through the built-in 1.81” CT.
30 – 9000 Amps by passing the 5 Amp secondary of an interposing CT with a windings ratio of
5000:5 through the built-in 1.81” CT.
Determine which of the four configurations is to be used for the application. Referring to table 1
set DIPswitch No. 1 to match the selected configuration:
•
D
own for 30 mA – 9.0 Amps with the system power conductors passing through the built-
in 1.81” CT
•
D
own for 30 mA – 9.0 Amps with the system power conductors passing through an
external C311CT with a windings ratio of 500:1with its secondary terminals connected to
terminals T1 & T2.
•
U
p for 3.0 – 900 Amps passing the 5 Amp secondary of an interposing CT with a windings
ratio of 500:5 through the built-in 1.81” CT.
•
D
own for 30 – 9000 Amps passing the 5 Amp secondary of an interposing CT with a
windings ratio of 5000:5 through the built-in 1.81” CT. (The values displayed on the
D64D1 Digital Display Unit, if installed, will read 0.03 – 9.0 kA)
2.2.2 GROUND FAULT TRIP CURRENT LEVEL - DIPSWITCHES 2, 3, 4, & 5
The ground fault TRIP LEVEL is 30 mA - 9000 Amps in three ranges. Table 1 provides a listing of
the fourteen TRIP LEVEL settings in each of three ranges, which can be made on DIPswitches 2,
3, 4, & 5, depending on the CT configuration selected in 2.2.1.
As indicated in the General Description, it is recommended that the ground fault TRIP LEVEL
setting be kept as close to the charging current as possible. This will provide maximum safety for
operating personnel and equipment protection. On resistance grounded systems, the TRIP
LEVEL setting should be set lower than 20% of the Neutral Grounding Resistor let-through
current.
If the measured ground fault current exceeds the TRIP LEVEL setting, the output relay changes
state after the pre-selected TRIP DELAY time.
2.2.3 GROUND FAULT TRIP DELAY TIME - DIPSWITCHES 6, 7, & 8
The ground fault TRIP DELAY time range is 20 milliseconds - 5.0 second. Table 1 provides a
listing of the eight TRIP DELAY settings, which can be made with DIPswitches 6, 7, & 8.
The TRIP DELAY time begins when the ground fault trip level setting is reached or is exceeded.
Set the ground fault TRIP DELAY time to provide the desired delay before the output relay
changes state when the ground fault TRIP LEVEL setting is reached or exceeded.
The setting should be selected to co-ordinate with other ground-fault devices connected on the
same transformer secondary: set shorter than upstream devices; set longer than downstream
devices. If no other ground-fault devices are connected, set for the shortest time.
2.2.4 OUTPUT RELAY OPERATING MODE - DIPSWITCHES 9 & 10
Referring to the Glossary of Terms, determine if FAILSAFE, NON-FAILSAFE, or PULSED AUTO
RESET operation of the output relay is required. The factory setting is NON-FAILSAFE with
DIPswitches 9 & 10 in the
D
own position.
Refer to Table 1 for DIPswitch settings for FAILSAFE and PULSED AUTO RESET operation.
2.3
OUTPUT RELAY CONTACT STATE
The output relay contact state is determined by the operating mode selected and the sensing
condition of the D64RPB100 relay. This is shown in Table 2. Use this table when deciding on field
connections. Refer to the CONNECTION section.