Ct/Vt Modules - GE B30 Instruction Manual

3.2 WIRING
An LED on the front of the control power module shows the status of the power supply:
LED INDICATION
CONTINUOUS ON
ON / OFF CYCLING
OFF
3
Switchgear
ground bus
When using an SH/SL power supply module or a B30 with the HardFiber system, before powering off the B30, save
data in the compact flash memory using Commands > Relay Maintenance > Save Non-Volatile Data. When not
NOTE
saved or the relay loses power, up to the last two minutes of data is not saved to the compact flash memory.
The optional Ethernet switch shown in the connection diagram above is not available for the B30 device.
NOTE
A CT/VT module may have voltage inputs on channels 1 through 4 inclusive, or channels 5 through 8 inclusive. Channels 1
and 5 are intended for connection to phase A, and are labeled as such in the relay. Likewise, channels 2 and 6 are intended
for connection to phase B, and channels 3 and 7 are intended for connection to phase C.
Channels 4 and 8 are intended for connection to a single-phase source. For voltage inputs, these channel are labelled as
auxiliary voltage (VX). For current inputs, these channels are intended for connection to a CT between system neutral and
ground, and are labelled as ground current (IG).
CT/VT modules may be ordered with a standard ground current input that is the same as the phase current input. Each AC
current input has an isolating transformer and an automatic shorting mechanism that shorts the input when the module is
withdrawn from the chassis. There are no internal ground connections on the current inputs. Current transformers with 1 to
50000 A primaries and 1 A or 5 A secondaries may be used.
CT/VT modules with a sensitive ground input are also available. The ground CT input of the sensitive ground modules is
ten times more sensitive than the ground CT input of standard CT/VT modules. However, the phase CT inputs and phase
VT inputs are the same as those of regular CT/VT modules.
3-12
POWER SUPPLY
OK
Failure
Failure
AC or DC
Heavy copper conductor
or braided wire
B8b B8a B6a B6b B5b
FILTER SURGE
Figure 3–13: CONTROL POWER CONNECTION
Verify that the connection made to the relay nominal current of 1 A or 5 A matches the secondary
rating of the connected CTs. Unmatched CTs may result in equipment damage or inadequate pro-
tection.
B30 Bus Differential System
NOTE:
14 gauge stranded
wire with suitable
disconnect devices
is recommended.
+
+
–
LOW
HIGH
CONTROL
POWER
UR-series
protection system
3 HARDWARE
AC or DC
+
—
OPTIONAL
ETHERNET SWITCH
827759AA.CDR

3.2.4 CT/VT MODULES

GE Multilin