Landis+Gyr ZMQ202, User Manual

Page: 21 / 88

H 71 0200 0215 f en - ZMQ202 / ZFQ202 - User Manual Gyr
Description of Unit 21/88
Based on the signs of A and R the microprocessor can allocate the reactive
energy to the four quadrants.
• Reactive energy in quadrant I: +Ri
• Reactive energy in quadrant II: +Rc
• Reactive energy in quadrant III: –Ri
• Reactive energy in quadrant IV: –Rc
Import
reactive
power
Export
reactive
power
+
_
I II
III IV
Export active power Import active power
cos ϕ = 0,5 (60°)
sin ϕ = 0,5 (30°) sin ϕ = 0,5 (150°)
cos ϕ = 0,5 (- 60°)
+
_
sin
ϕ
=1 (90°)
Lagging
Lagging
Leading
Leading
Q
S
+Ai
+Ac
+Rc +Ri
-Ri -Rc
-Ac
-Ai
-90°
cos ϕ
=
1(0°
)
I
ϕ
P
U
2.5 Tariff Control
Various signal sources can be used to select the required tariff. Tariff
control may be performed:
• Externally by the three input control signals E1, E2, E3 (with selectable
control voltage ranges: 24 V up to 230 V; the control voltage must be
specified by the customer)
• Internally by the calendar clock and the time switch
• By event signals based on threshold values of the monitoring functions,
e.g. frequency, voltage
Signals from the various signal sources can be combined to realise a
sophisticated tariff structure.
Allocation to the four
quadrants