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Metering
and
Extended Protective Relaying
I
ib/
Metering
Functions
The
metered and logged parameters
of
Static
Trip lllC/CP/CPX
trip
units may be
monitored remotely
over the
communications
bus
or
locally
with
the
Breaker
Display Unit (see
Breaker
Display
Unit
section). The
specifications
of
the metered para-
meters
are given
in
the
following
table. The real{ime
and
min/max
values
represent
averages
of
each measured
para-
meter over
approximately
one second.
Measured Parameters
Specif
ications
Parameter
Description
Phase
Currents
Measured
RMS
Value of each
Phase Current
Range:
0
to
1000%
of
Phase Current
Accuracy:
:"i;::?'xi3!'"H'i$,.,,",
I
0%
to
125% of Phase
Sensor
BDU
Display:
la
=
XXXX
lb
=
XXXX
lc
=
XXXX
Average
Phase
Arithmetic
Average of
Phase
A,
Phase
B,
Current
and
Phase C Currents
BDU
Display:
l*
=
YXXX
Ground
Current
Measured
RMS
Value
of
Ground Current
Range
0
lo
125%
of Ground
Sensor
Primary Rating
Accuracy:
+17" of
Ground
Sensor from
10%
to
125%
of Ground
Sen-
BDU
Disptay:
ij't=
*ru
Neutral
Current
Measured
RMS
Value
of
Neutral Current
Range:
0
to
1000% of Neutral Current
Sensor Primary Rating
Accuracy:
+1"/"
of
Neutral Sensor
from
10%lo
125% of
Neutral Sensor
BDU
Display:
ln
=
XXXX
Phase
Voltages
Measured
RMS
Value of each
Phase Voltage
(4 Wire Mode only)
Range
0
to 380 Volts
Accuracy: !1%
of reading
from 70 to
380 Volts
BDU
Display: Va =
XXX
Vb
=
XXX
VC
=
XXX
Arithmetic Average
of
A,
B
and
C
Phase
Voltages
(4-Wire mode only)
BDU
Display:
V*.=
XXX
Measured
RMS
Value of
each
Line to
Line Voltage
(3-Wire
and
4-Wire Modes)
Range:
0 to 660 Volts
Accuracy: !1%
of reading from
I20
to
660 Volts
BDU
Display:
Vab
=
XXX
VbC
=
XXX
VCa
=
XXX
Arithmetic Average
of
A-B
B-C,
and
C-A
Line
to
Line Voltage
BDU
Display:
VXX =
XXX
Description
Measured
Line Frequency taken from
Phase A Voltage
Range:
45.0
to
70.O Nz
Accuracy:
!.25%
of reading provided
Va
is
above
90V,
BDU
Display: Hz =
XX.X
Signed
Sum of
the Measured
Real Power
of all
3
Phases in Kilowatts
Range:
x7,200
(Normally
Limited
by
Breaker
Size)
Accuracy:
+2% of Reading provided
power
factor
is
greater than
50%
and
current
and voltage
signals
are within their
speci-
fied accuracy
ranges.
BDU
Display: kW =
XXXX
Signed Sum of
the Measured
Power of
all
3
Phases in Kilovars
Range:
17,200
(Normally
Limited
by
Breaker
Size)
Accuracy: t2%
of Reading provided
power
factor
is less than
90%
and
current
and voltage
signals
are within their
speci-
fied accuracy
ranges.
BDU
Display: kQ =
XXXX
Sum of the
Apparent
Power of all
3
Phases in Kilovolt Amperes
Range:
O
Io
7
,2O0
(Normally Limited
by
Breaker Size)
Accuracy: t2%
of Reading provided,
current and voltage
signals
are within their
specified
ac-
curacy
ranges.
BDU
Display: kVA
=
XXXX
Ratio
of
Real Power to
Apparent
Power
Range:
-.99
to
.1.00
Accuracy:
.04
between
.50
leading
and
.50
lagging provided current
and voltage signals
are
within their
specified accu-
racy
ranges.
BDU
Display:
PF
=
X.XX
Signed
Accumulation of
Real Energy
in
1000's of Watt Hours
Range:
0tot9999,999KilowattHours
Accuracy:
+2%ofReading
BDU
Display:
kWh =
XXXX
(or MWh
=
XXXX)
Accumulation of
Real Energy in 1000's of
Negative Watt Hours
Range:
0 to
t9,999,999
Kilowatt
Hours
Accuracy:
x2%
of
Reading
BDU
Display:
-kwh
XXXX
(or -MWh
XXXX)
Signed
Accumulation of
Reactive Energy
in
I000's
of VAR Hours
Range:
0tot9,999,999KiloVARHours
Accuracy:
+27" of
Reading
BDU
Display: kQh
= XXXX (or
MQh
= XXXX)
Parameter
Frequency
Real Power
Reactive Power
Apparent
Power
Power Factor
Kilowatt Hours
Kilowatt Hours
Reverse
Average
Phase
Voltage
Line Voltages
Average
Line Voltage
r-U
KiloVAR Hours
21
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