Toshiba GR200 Series - (ii) Metering in reactive power (Q); 9.2.5 Polarity setting for power factor values; (i) AP setting

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 1192 -
(ii) Metering in reactive power (Q)
Similar to the active power (P), the user should set the metering sign for the reactive power
(Q). The Q value will have the minus sign (–) based on the P value, when Lag is set for setting
[Current] (Figure 9.2-4.a). On the other hand, the Q value will have the plus sign (+) based on
the P value, when Lead set for the setting (Figure 9.2-4.b).
V
I
I
II
III
IV
[Current]=Lag
I
I
II
III
IV
V
a. Q (shown in quadrant IV) has a minus sign
because the Q is supplied by the outside source.
The decision is made with the P (shown in the
quadrant IV, defined with [Power]=Send) having
“a plus sign” when the current lags the voltage.
[Current]=Lead
(Q<0)
(Q>0)
(Q>0)
(Q<0)
(Q<0)
(Q<0)
(Q>0)
(Q>0)
b. Q (shown in quadrant IV) has a plus sign because
the Q is absorbed by the outside source. The
decision is based on the P (shown in the
quadrant I, defined with [Power]=Receive)
having “a minus sign” when the current leads
the voltage.
Figure 9.2-4 Sign of the reactive power (Q) ruled by setting [Current]
9.2.5 Polarity setting for power factor values
The power factor (PF) value is shown by the rule to align the plus/minus sign (±) of the P value
(i.e., setting [PF_sign]=AP, default setting). However, the user can change the rule (i.e., setting
[PF_sign]=AP+RP); as a result, the PF value will have the plus sign (+), provided both the P
value and the Q value have the same plus (+) sign or minus (–) sign.
(i) AP setting
When the sign of the PF value is required to match with the sign of the P value, set AP for the
setting [PF_sign].