But there’s internal protection so that no step is re-connected before 45-50 seconds since this period is required for the capacitor unit
to discharge. Otherwirse there’ll be over voltages on the capacitor unit which wiill cause damages.
In the same logic, no step is connected before 45-50 seconds if the supply voltage (system voltage) is off and on again.
In the switching logic, the amount of the reactive power required as well as the rotating system logic are also important . The relay
will decide to connect or disconnect the proper step according to the power required.
OVER and UNDER VOLTAGE PROTECTION
If the supply voltage exceeds an adjusted value between 250 Volt and 299 Volt, the “O.V.set” led will start blinking. İf the over
voltage continues longer than 2-3 seconds, the relay will disconnect all steps. And the display will read “
A G r
” blinking meaning that
there was over voltage.
If the supply voltage is approximately 5V below the set value, “
A G r
” will be cleared and the display will start reading the present
co s ø
value.The relay will start to operate properly and if necessary, it’ll start to connect the capacitor stpes.
If the supply voltage is below 160 Volts, all steps are disconnected automatiically and the display will read “
d gr
” meaning under
voltage
If the supply voltage is over 165 Volts again,”dgr” will disappear on the screen and the present
co s ø
value will start reading on the
display. The realy will start to operate properly and if necessary, it’ll start to connect the capacitor steps.
AUTOMATIC POLARITY ADJUSTMENT :
In case the terminals “k” and “l” of the current transformer are not connected in the proper sequence , the relay will sense and
corrects this mistake .
But it’s important to connect the supply voltage and the current transformer from the same phase of the network.
If the supply voltage and the current transformer are at different phases, the polarity adjustment will not operate and the
relay will not function properly since the input datas are not correct.
ALARM:
If normal led is off within 5 minutes after all capacitors are in operation or all capacitors are disconnected, that means a problem with
compensation. In this case, “
Alr
” is displayed and starts blinking . At the same time, alarm relay operates, and alarm contacts will
function. After the system becomes normal, “
Alr
” is cleared on the screen and
co s ø
value is displayed again.
CONNECTION AND COMMISSIONING :
The connection of the relay is at Figurel 2. As a sample, 7-step relay connection is included in the figure. Every relay has its own
connection diagram at the rear panel .
The important points for the connection are as follows;
The voltage supply and the current transformer should be on the same phase. In case the voltage supply and CT phase don’t match,
the cosø value on the display will be wrong and the relay will not function properly..
The current transformer should be connected at the load before the capacitor units, the CT current should read both the load and
capacitor currents.
The phase voltage should be connected to the terminal no.2 of the relay via 6A fuse, the neutral of the supply voltage should be
connected to terminal no.1 on the relay .
As described in the Setting section, , “
c/k
” , “Set
C o s ø
” , “
T
on
” , “
T
off
” , “Steps, ” “
S e q u e n c e
” and “O.V.set” values are adjusted
properly. If
C/k
set is at automatic setting, the relay will choose the proper c/k and start to function.
In case
c/k
set value is to be adjusted manually, please use selection Table 1.
Even the factory setting are not changed, in most cases the result and functionality is successfull. In case the load is variable, too
low , too much, it’s advised to choose sequence 1.2.3.6........6 or 1.2.4.8...........8 for beter results.
TECHNICAL PROPERTIES
