Table 793:
Power quadrants
Quadrant
Current
P
Q
PF
Power
Q1
Lagging
+
+
0…+1.00
+ind
Q2
Lagging
-
+
0…-1.00
-cap
Q3
Leading
-
-
0…-1.00
-ind
Q4
Leading
+
-
0…+1.00
+cap
The active power P direction can be selected between forward and reverse with
Active
power Dir
and correspondingly the reactive power Q direction can be selected with
Reactive power Dir
. This affects also the accumulated energy directions.
The accumulated energy is calculated separately as forward active (
EA_FWD_ACM
),
reverse active (
EA_RV_ACM
), forward reactive (
ER_FWD_ACM
) and reverse reactive
(
ER_RV_ACM
). Depending on the value of the unit multiplier selected with
Energy unit
Mult
, the calculated power values are presented in units of kWh/kVArh or in units of
MWh/MVArh.
When the energy counter reaches its defined maximum value, the counter value is reset
and restarted from zero. Changing the value of the
Energy unit Mult
setting resets the
accumulated energy values to the initial values, that is,
EA_FWD_ACM
to
Forward Wh
Initial
,
EA_RV_ACM
to
Reverse Wh Initial
,
ER_FWD_ACM
to
Forward VArh Initial
and
ER_RV_ACM
to
Reverse VArh Initial
. It is also possible to reset the accumulated energy
to initial values through a parameter or with the
RSTACM
input.
Sequence components
The phase-sequence components are calculated using the phase currents and phase
voltages. More information on calculating the phase-sequence components can be found
in
in this manual.
8.1.3
Measurement function applications
The measurement functions are used for power system measurement, supervision and
reporting to LHMI, a monitoring tool within PCM600, or to the station level, for example,
with IEC 61850. The possibility to continuously monitor the measured values of active
power, reactive power, currents, voltages, power factors and so on, is vital for efficient
production, transmission, and distribution of electrical energy. It provides a fast and easy
overview of the present status of the power system to the system operator. Additionally,
it can be used during testing and commissioning of protection relays to verify the proper
operation and connection of instrument transformers, that is, the current transformers
(CTs) and voltage transformers (VTs). The proper operation of the protection relay analog
measurement chain can be verified during normal service by a periodic comparison of the
measured value from the protection relay to other independent meters.
1MAC059074-MB A
Section 8
Measurement functions
615 series ANSI
905
Technical Manual
Summary of Contents for Relion 615 series
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