Graphical Front Panel - GE T60 Instruction Manual

PRODUCT SETUP
The
CURRENT CUT-OFF LEVEL
power cut-off level is calculated using the following equations. For Delta connections:
For Wye connections:
where VT primary = VT secondary × VT ratio and CT primary = CT secondary × CT ratio.
For example, given the following settings:
CURRENT CUT-OFF LEVEL
VOLTAGE CUT-OFF LEVEL
PHASE CT PRIMARY
PHASE VT SECONDARY
PHASE VT RATIO
PHASE VT CONNECTION
We have:
CT primary = "100 A", and
VT primary =
PHASE VT SECONDARY
5
The power cut-off is therefore:
power cut-off= (
= ( × 0.02 pu × 1.0 V × 100 A × 13811.2 V) / 66.4 V
= 720.5 watts
Any calculated power value below this cut-off does not display. As well, the three-phase energy data do not accumulate if
the total power from all three phases does not exceed the power cut-off.
Lower the
VOLTAGE CUT-OFF LEVEL
measurements. Unless dictated otherwise by a specific application, the default settings of "0.02 pu" for
CUT-OFF LEVEL

5.3.3 Graphical front panel

The graphical front panel is a hardware option. See the Order Codes section in chapter 2 for details.
Use the EnerVista software to configure the graphical front panel. The settings are not accessible from the graphical front
panel.
The following screens are available:
• Home page
• Rolling mode
• Metering editor
• Single-line diagram editor
• Annunciator editor
• Configurable navigation
5-28
and the
VOLTAGE CUT-OFF LEVEL
: "0.02 pu"
: "1.0 V"
: "100 A"
: "66.4 V"
: "208.00 : 1"
: "Delta"
x
PHASE VT RATIO
×
CURRENT CUT-OFF LEVEL OLTAGE CUT-OFF LEVEL
V
and
CURRENT CUT-OFF LEVEL
and "1.0 V" for
VOLTAGE CUT-OFF LEVEL
are used to determine the metered power cut-off levels. The
= 66.4 V x 208 = 13811.2 V
× CT primary × VT primary)/VT secondary
with care as the relay accepts lower signals as valid
are recommended.
T60 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
Eq. 5-3
Eq. 5-4
Eq. 5-5
CURRENT