100 The PQF-Manager user interface Manual Power Quality Filter PQFS
Table 43: Reactive power tasks that the filter can perform
Reactive power task requirement
Description and filter set-up to be made
Balance load: Disabled
The filter will not do any reactive power task,
regardless of the values set for cos ϕ or static reactive
power
Power factor compensation with
inductive power factor set point, no
load balancing required
(a)
Target cos ϕ: Desired power factor between 0.6 and
1.0
The filter will do power factor compensation up to the
cos ϕ set point, regardless of the value set for static
reactive power(b)
Power factor compensation with
capacitive power factor set point,
no load balancing required
(a)
PFC type
: Dyn. Cap.
Target cos ϕ
: Desired power factor between 0.6 and
1.0
The filter will do power factor compensation up to the
cos ϕ set point, regardless of the value set for static
reactive power
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Fixed capacitive power step with a
rating of x kvar, no load balancing
required
(a)
PFC type
: Static cap.
Q static
: x kvar
The filter will generate x kvar reactive capacitive
power, regardless of the value set for the target cos ϕ
Fixed inductive power step with a
rating of x kvar, no load balancing
required
(a)
PFC type
: Static ind.
Q static
: x kvar
The filter will absorb x kvar reactive inductive power,
regardless of the value set for the target cos ϕ
Remarks:
(a)
When load balancing is required, set the ‘
Balance load
’ flag to the desired mode. The
following modes are available depending on the way the filter is connected (3-W or 4-W)
- ‘Disabled’: No load balancing is done.
- ‘L-L’: Loads connected between phases only are balanced. Loads connected between
phases and neutral are not balanced.
- ‘L-N’: Load
s connected between phase and neutral are balanced. Loads connected
between phases are not balanced. This mode is only available when the filter is connected
in 4-W mode.
- ‘L-L & L-N’: Both loads connected between phase and neutral as well as loads connected
between phases are balanced. This mode is only available when the filter is connected in
4-W mode.
Note: The modes ‘L-N’ and ‘L-L & L-N’ can be used to minimize the amount of fundamental
frequency current flowing in the neutral.
(b)
If the measured cos ϕ is higher than the set point and is inductive (e.g. measured 0.97
inductive and set point 0.92 inductive, then the filter will not make any correction. If the
measured cos ϕ is capacitive, the filter will correct the power factor to 1.0
(c)
If the measured cos ϕ is higher than the set point and is capacitive (e.g. measured 0.97
capacitive and set point 0.92 capacitive, then the filter will not make any correction. If the
measured cos ϕ is inductive, the filter will correct the power factor to 1.0
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