3.3.5 Accumulated Reactive Power Quantities

The metrology module generates the following accumulated reactive power (Q) quantities: Q_A, Q_B, Q_C, Q_A_F, Q_B_F, Q_C_F, Q_N, and Q_N_F.

They are in units of [VAR samp-scaled]. They are scaled accumulated reactive power quantities in the whole integration period. They are calculated according to the following formula:


$Q_x = \sum_{i = 1}^{N} {V^{'}_x_s a m p l e}_{i} \times {I^{''}_x_s a m p l e}_{i}$	$x = [A, B, C]$
$Q_x = \sum_{i = 1}^{N} {V^{'}_a v c_s a m p l e}_{i} \times {I^{''}_x_s a m p l e}_{i}$	$x = [N]$

Where,

V’_x_sample_i is i^th filtered phase voltage value of phase x in present integration period
V’_avc_sample_i is i^th filtered 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 filtered phase current value of phase x in present integration period
V’_x_sample_i, V’_avc_sample_i and I’’_x_sample_i have additional 90 degree phase difference
x = [A, B, C]
N = The number of samples in the last measurement interval

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

The Q_x and Q_x_F are stored in the sQ23.40 format.

Name:	Q_A, Q_B, Q_C, Q_A_F, Q_B_F, Q_C_F, Q_N, Q_N_F
Property:	Read


Bit	63	62	61	60	59	58	57	56
	Q_x/Q_x_F[63:56]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0


Bit	55	54	53	52	51	50	49	48
	Q_x/Q_x_F[55:48]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0


Bit	47	46	45	44	43	42	41	40
	Q_x/Q_x_F[47:40]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0


Bit	39	38	37	36	35	34	33	32
	Q_x/Q_x_F[39:32]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0


Bit	31	30	29	28	27	26	25	24
	Q_x/Q_x_F[31:24]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0


Bit	23	22	21	20	19	18	17	16
	Q_x/Q_x_F[23:16]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0


Bit	15	14	13	12	11	10	9	8
	Q_x/Q_x_F[15:8]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0


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

3.3.5 Accumulated Reactive Power Quantities

Bits 63:0 – Q_x/Q_x_F[63:0] VAR-Samples, Phase-X (sQ23.40)