NOVAR 2600 Operating Manual
where :
CHL… capacitor harmonic load factor
[ % ]
i........... order of harmonic
[ - ]
Ui........ voltage of i
th
harmonic component
[ V ]
U
NOM
… nominal voltage
[ V ]
This factor value does respect, besides respecting each harmonic component’s voltage value,
distribution of harmonic components of different orders across their spectrum and it addresses the
effect of voltage values. It is thus a more convenient value to determine total load of a capacitor by
current. If the nominal value voltage is undistorted, this factor is at value of 100%. The following table
shows CHL factor values for a few selected scenarios of harmonic distribution at fundamental
harmonic component nominal value.
Tab. 4.7: 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.
4.4.6.5 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 reserve values are not visible in the PF-control screen ; you must switch to general meter actual
data and scroll down into power values group to check them.
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
57
Содержание NOVAR 2600
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