Lifasa MCE06ADV - 5.3 C;K Parameter Calculation; 5.4 Stages Configuration of PF Correction Equipment; 5.5 Connection and Re-connection Time Settings

Controllers MCE06ADV – MCE12ADV
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5.3 C/K parameter calculation
For conditions other than those given in table 5.1 the parameter C/K can be calculated as follows.
The necessary data to perform the calculation are: The power of the smaller capacitor step, Q, the supply
voltage, V and the current transformer ratio, K&
sec
/ IIK
prim
=
.
Where:
prim
I is the CT primary rated current (i.e. in a 250/5 CT , the primary rated current is 250A)
sec
I is the CT secondary rated current , usually 5A
Then, the smaller step reactive current, I
C
, can be calculated as:
V.
Q
C
I
3
=
and the C/K parameter would be
V.K.
Q
K
I
K/C
C
3
==
Example: Assume a PF equipment at 500V where the smaller capacitor is rated to 60kvar and the CT
has a ratio 500/5. The calculation would be as follows:
K ratio
1005/500
=
=
K
Smaller capacitor current
AI
C
28,69
500.3
1000.60
==
C/K parameter
69,0
100
28,69
/ ===
K
Ic
KC
5.4 Stage’s Configuration of PF correction equipment (Configuration program)
To set-up this parameter, use the keys until the cursor points to the option , then push
PF correction equipment is constituted by several capacitor stages, which may have different power
ratings. Taking as base the power of the smaller capacitor stage, the powers of the rest of stages can be
given in terms of multiples of the smaller step. Then we could state the configuration (configuration
program) of PF equipment as:
Program 1:1:1… All the stages have the same power in kvar.
Program 1:2:2… The second stage and successive have a power double than the 1st step.
The available programs of MCExxADV regulator are listed in table 5.2. The default factory setting of
MCExxADV devices is 1:1:1:1
Table 5-2.- Available configuration programs for MCExxADV devices
Screen Indication
Stage’s configuration
111 1:1:1:1:1….
122 1:2:2:2:2….
124 1:2:4.4:4….
248 1:2:4:8:8….
112 1:1:2:2:2….
5.5 Connection and re-connection time settings:
To set-up this parameter, use the keys until the cursor points to the option , then push
This parameter sets up the delay times of the device. The setting value, Tc, is the delay time between the
connection or disconnection of successive capacitor stages. The parameter also sets up the called re-
connection delay, Tr, which is the minimum time that must elapse between the disconnection of a C stage
and its following connection. The range of Tc settings goes from 4s to999s. Tr is automatically set to 5
times Tc (Notice that Tr is needed to guarantee the capacitors discharge). The default setting of Tc is
10s.