APL SEM 3P V2, Technical Manual

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3.4. Protective Class
The test is carried out with the energy meter manufactured by AplombTech BD Ltd. in
accordance with IEC60529-4.
3.5. Resistance to Heat and Fire
Resistance to heat and fire class: V0 (all the casing made out of heat-resistant and fire-
retardant material)
4. Functions
4.1. Metering Function
APL SEM 3P V2 Three-phase Keypad Prepayment Energy Meter can measure reverse power
in the same way of measuring forward power and the energy can be accumulated in total active
energy and active energy of each billing month. It can measure total active power and store the
data and calculate the credit balance, then store the data; meanwhile have them indicated by LED.
The meter measures real-time power by pulse constant and pulse interval.
4.2. Active Energy Metering
Active energy unit: kWh, reactive energy unit: kvarh.
The metering phasor diagram in right connection as:
U
a
фa
Ia
Ic
фc
фb
Ub
U Ib
c
Active power expressed as:
P =P
1
+ P
2
+ P
3
= U
a
I
a
cos
φ
a
+ U
b
I
b
cos
φ
b
+ U
c
I
c
cos
φ
c
Reactive power expressed as:
Q =Q
1
+ Q
2
+ Q
3
= U
a
I
a
sin
φ
a
+ U
b
I
b
sin
φ
b
+ U
c
I
c
sin
φ
c
Active energy expressed as:
E
p
=
∫
P d t=
∫
（
U
a
I
a
cos
φ
a
+ U
b
I
b
cos
φ
b
+ U
c
I
c
cos
φ
c
）
d t
Reactive energy expressed as: E
q =
∫
Q d t=
∫ （
U
a
I
a
sin
φ
a
+ U
b
I
b
sin
φ
b
+ U
c
I
c
sin
φ
c
）
d t
4.3. Active Direction Definition
The A P L SEM 3P V2 M e t e r , d e v e l o p e d by A p l o m b T e c h BD Ltd., uses t h e
conception of forward power and reverse power from the customer
s’ point of view.
Custome
rs’ forward power =power received from the grid.
Custome
rs’ reverse power =power sent to the grid.
4.4. Active Max Demand (MD) Calculation
Active maximum demand unit is kW.