3.3.4 Accumulated Active Power Quantities

The metrology module generates the following accumulated active power (P) quantities: P_A, P_B, P_C, P_A_F, P_B_F, P_C_F, P_N and P_N_F.

They are in units of [W-samp scaled]. They are scaled accumulated active power quantities in the whole integration period. They are calculated according to the following formulas:


$P_x = \sum_{i = 1}^{N} {V_x_s a m p l e}_{i} \times {I_x_s a m p l e}_{i}$	$x = [A, B, C]$
$P_x = \sum_{i = 1}^{N} {V_a v c_s a m p l e}_{i} \times {I_x_s a m p l e}_{i}$	$x = [N]$

Where, V_x_sample_i is i^th sampled phase voltage value of phase x in present integration period; V_avc_sample_i is i^th sampled phase voltage value of the active voltage channel (according to STATE_FLAG.TIMING_Vx) in present integration period; I_x_sample_i is i^th sampled phase current value of phase x in present integration period; x = [A, B, C, N]; N is the number of samples in the last measurement interval.

They are used to calculate the active power. In the case of the neutral channel, it is useful for calculating the angle of the neutral current.

P_x and P_x_F are stored in sQ23.40 format.

Name:	P_A/P_B/P_C/P_A_F/P_B_F/P_C_F/P_N/P_N_F
Offset:	Metrology_Acc_Out[15-22]
Property:	Read


Bit	63	62	61	60	59	58	57	56
	P_x/P_x_F[63:56]
Access	R	R	R	R	R	R	R	R
Reset


Bit	55	54	53	52	51	50	49	48
	P_x/P_x_F[55:48]
Access	R	R	R	R	R	R	R	R
Reset


Bit	47	46	45	44	43	42	41	40
	P_x/P_x_F[47:40]
Access	R	R	R	R	R	R	R	R
Reset


Bit	39	38	37	36	35	34	33	32
	P_x/P_x_F[39:32]
Access	R	R	R	R	R	R	R	R
Reset


Bit	31	30	29	28	27	26	25	24
	P_x/P_x_F[31:24]
Access	R	R	R	R	R	R	R	R
Reset


Bit	23	22	21	20	19	18	17	16
	P_x/P_x_F[23:16]
Access	R	R	R	R	R	R	R	R
Reset


Bit	15	14	13	12	11	10	9	8
	P_x/P_x_F[15:8]
Access	R	R	R	R	R	R	R	R
Reset


Bit	7	6	5	4	3	2	1	0
	P_x/P_x_F[7:0]
Access	R	R	R	R	R	R	R	R
Reset

3.3.4 Accumulated Active Power Quantities

Bits 63:0 – P_x/P_x_F[63:0] Watt-samples, phase-x (sQ23.40)