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PUB 50412
D64RPB100 SERIES B1 DIGITAL GROUND FAULT RELAY
Revision 3
April, 2008
Page 6
Interposing Current Transformer
A Current Transformer with the 5 Amp secondary of the CT passing through the window
of the built-in CT of the D64RPB100.
Interposing current transformers (CTs) are required on applications where:
-
The ground fault trip current setting levels are higher than the 30 mA –9 Amp
range available with the built-in 1.81” CT, plus any of the following.
-
The size of the power conductors on which the D64RPB100 is being applied is
too large for the 1.81” built-in CT.
-
The system voltage on which the D64RPB100 is being applied is higher than 660
Volts.
-
The system primary phase current on which the D64RPB100 is being applied
exceeds 200 Amps continuous.
An Interposing CT with 500:5 ratio is to be used to give a ground fault trip current setting
range of 3 – 900 Amps. The maximum continuous primary phase current is to be 1000
Amps
An Interposing CT with 5000:5 ratio is to be used to give a ground fault trip current setting
range of 30 – 9000 Amps. The maximum continuous primary phase current is to be
10,000 Amps
Chassis Ground
Chassis ground is the ground to which all of the non-current carrying metal equipment is
connected/bonded. Typically, equipment grounding is provided by means of a ground bus.
A solid connection is to be made from terminal 3 of the D64RPB100 to the nearest
chassis ground to ensure the relay complies with the specified Electromagnetic
Compatibility (EMC) standards.
2.2
DIPSWITCH SETTINGS
FOR MAXIMUM SAFETY THE SETTINGS DESCRIBED IN THIS SECTION SHOULD BE MADE
WITH CONTROL VOLTAGE REMOVED FROM THE D64RPB100 RELAY.
The DIPswitches are mounted inside of the relay and are accessible through the front cover. It is
recommended that all of the DIPswitches be set at one time.
Should it be necessary to make changes to the DIPswitch settings when the D64RPB100 relay is
energized, this can be done without having any adverse effect on the performance of the relay.
Please Refer to Table 1. This provides a list of the 10 DIPswitches, the function of each group,
and the values related to each setting. This table is reproduced on the side of each D64RPB100
in the form of a self-adhesive label.
The DIPswitches are numbered from 1 to 10, left to right. U = Up, D = Down.
A DIPswitch setting chart on the front cover provides blank boxes for each DIPswitch. After setting
the DIPswitches, use a permanent marker to check the corresponding boxes on the chart.
2.2.1 CT CONFIGURATION – DIPSWITCH NO. 1
The D64RPB100 is capable of measuring ground fault currents from 10 mA – 10000 Amps with
trip level settings in three ranges:
30 mA – 9.0 Amps with the system power conductors passing through the built-in 1.81” CT.
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.