Toshiba GR 200 Series, Instruction Manual

Page: 1068 / 1563

6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 1047 -
Table 9.2-3 Selection of units to display
Metering items Settings Selection of a unit to display
Voltage (V) [
V-Display Unit
] Volt (
V
) or kilo-volt (
kV
)
Current (I) [
I-Display Unit
] Ampare (
A
) or kilo-ampare (
kA
)
Active power (P) [
P-Display Unit
] Kilo-watt (
kW
) or Mega-watt (
MW
)
Reactive power (Q) [
Q-Display Unit
] Kilo-var (
kvar
) or Mega-var (
Mvar
)
Apprent power (S) [
S-Display Unit
] Kilo-VA (
kVA
) or Mega-VA (
MVA
)
9.2.3
Diminishing a very small value to display zero
In the metering function, negligible metering values will be considered as zero. The user can
set the level to diminish in % using settings [
I-Valid Level
] and [
V-Valid Level
], at which values
‘4.00’ and ‘0.30’ are set, as default, respectively. Thus, zero (0) will be displayed when the
applied quantities at the VCT, which are lesser than the setting levels.
9.2.4
Flow settings for active/reactive/apparent powers
The user should set the rules for the metering P, Q, and S
(i)
Metering in active power (P)
When the metering function measures the value for supplying power, the user should set
Send
for the [
Power
]. Conversely, if the metering function should operate for absorbing power, set
Receive
for the setting. Figure 9.2-3 illustrates the sign of the active power (P), which is
polarized with the voltage (V). In Figure 9.2-3.a exemplifies the metering function operating
for the supplying power so that the value P will have plus (+) sign (i.e., the I lags the V, which
shown in Quadrant IV). In Figure 9.2-3.b, the value P will have minus (–) sign when the I lags
the V, provided
Receive
is set for the setting.
V
I
I II
III IV
Receiving
(+)
[
Power
]=
Send
I
I II
III IV
V
a. Metering (P) for supplying power b. Metering (P) for absorbing power
[
Power
]=
Receive
(P<0) (P>0)
(P>0)
(P<0)
(P<0) (P>0)
(P<0)
(P>0)
Sending Receiving Sending
Figure 9.2-3 Sign of the active power (P) ruled by setting [Power]
(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