NOVAR 2100/2200 Operating Manual
Tab. 4.9: Examples of CHL factor values for selected distributions of voltage harmonic components
(U
1
=U
NOM
)
No.
voltage harmonic component levels [ % ]
CHL
3
rd
5
th
7
th
9
th
11
th
13
th
15
th
17
th
19
th
[ % ]
1
2.5
3.5
2.5
1.0
2.0
1.5
0.8
1.0
0.5
110
2
3.5
4.5
3.5
1.2
2.5
2.0
1.0
1.5
1.0
118
3
5.0
6.0
5.0
1.5
3.5
3.0
0.5
2.0
1.5
133
4
5.5
6.5
5.5
2.0
4.0
4.0
1.8
2.3
1.8
146
5
8.0
9.0
8.0
6.0
7.0
7.0
2.3
4.0
3.5
208
Example 3 (CHL = 133%) corresponds to voltage harmonic distortion limits as specified in EN 50160.
4.7.4 RC, RL – Compensation Reserve Powers to Reach
Target Power Factor
With the compensation reserve powers RC and RL you can check if installed compensation power, i.e.
total reactive power sum of all installed compensation capacitors and chokes is sufficient to keep
preset target factor or not.
The reserves are defined as follows :
Capacitive reserve power of phase L1 :
RC
1
=
∑
Q
COFF
1
−
∑
Q
LON
1
−
ΔQfh
1
Inductive reserve power of phase L1 :
RL
1
=
∑
Q
CON
1
−
∑
Q
LOFF
1
+
ΔQfh
1
where :
∑Q
COFF1
… sum of L1-phase capacitive-type reactive power components of the control*
)
outputs being just switched off (capacitive reactive power of an output considered
as positive )
∑Q
CON1
…. sum of L1-phase capacitive-type reactive power components of the control*
)
outputs being just switched on
∑Q
LON1
…. sum of L1-phase inductive-type reactive power components of the control*
)
outputs being just switched on (inductive reactive power of an output considered
as negative )
∑Q
LOFF1
…. sum of L1-phase inductive-type reactive power components of the control*
)
outputs being just switched off
ΔQfh
1
….... control deviation reactive power of L1-phase
*
)
The outputs that have non-zero reactive power and that are not set as fixed outputs are
considered as the control outputs (including the outputs that are temporary disabled due to
OE-alarm actuation).
Then, three-phase reserves are :
Capacitive three-phase reserve reactive power :
∑
RC
=
RC
1
+
RC
2
+
RC
3
Inductive three-phase reserve reactive power :
∑
RL
=
RL
1
+
RL
2
+
RL
3
If any reserve is positive that means that there are still one or more outputs that can switched on or off
to reach target power factor in the network.
63
