CIRCUTOR FRE Series - Manual (Page 10)

FRE / FRES
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4.6.3 Power block:
The power block of FRE or FRES units is made up of 3 to 12 thyristors + capacitor groups, depending on
the type. Each group consists of a 6-terminal capacitor (three single-phase capacitors), three (*) thyristor
modules attached to a cooling heatsink, one RBE reactor for each step and the suitable protection
elements addapted to the module's rated power.
(*) On some models the three thyristor modules are integrated into a single encapsulated package
5 INSTALLATION
5.1 Preparation
FRE and FRES CIRCUTOR's static filters are prepared for an easy installation and start-up.
Remove the equipment's packaging and verify that the unit's electrical characteristics are suitable for
connection to the available grid. For this, check the characteristics label located inside the cabinet, next
to the regulator, refer to Fig. 4-1 as an example. Key data to be checked:
- Grid voltage and mains frequency, U
n
/ f.
- Nominal power of the capacitor bank, Q
n
(kvar) and composition
- Type of filter, identified by the p% factor (7%, 14%, ..., etc.)
- Current consumption, I
max
(See label). This current must be considered to select the proper size
of the equipment's power supply cable and ultimately the main switch or the external circuit
breaker to protect the equipment.
- Auxiliary control voltage, U
aux
(See section 5.3.3)
- Environmental conditions. (See section 4.3)
5.2 Installation location
For static switching equipment it is specially important to maintain a minimum distance around the
equipment to facilitate cooling. In self-supporting cabinets, the back and front sides of the cabinet must
be kept at least 50 cm away from walls and other equipment. Regarding the sides, it is recommended
that a separation of 10 cm to be maintained between adjacent equipment. On wall mounted cabinets, it
is recommended that at least 20 cm of separation be maintained between the sides of adjacent
equipment.
NOTE: Static units have one or more aluminium heatsinks for cooling the thyristors.
Periodically clean these heatsinks with a brush or with compressed air and ensure
that they have maximum ventilation.
Make sure the equipment can be accessed easily.
The environmental conditions of the location where the equipment is installed must not surpass the
limits established in the technical characteristics (See section - )
To ensure proper ventilation, the unit must be installed in a vertical position.
In accordance with most National Electric Codes and LVD, once the unit is installed, it must be
protected against electric shock hazard due to direct or indirect contacts; therefore, a circuit breaker and
an earth leakage protection relay should be provided for the capacitor bank's supply line.
5.3 Connection of the capacitor bank with filters to the grid
Check that the nominal voltage of the capacitor bank with filters matches the voltage
between phases of the grid where it is being connected. Also check the auxiliary
circuit voltage (CPC controllers). For this, refer to section 5.3.3
For feeding cables into the capacitor bank cabinet, always use the entry points
available for this purpose.
Do not drill holes into the cabinet for feeding cables through them or for installing
support brackets. Drilling produces metal shavings that may enter the contacts or
other devices and cause short-circuits.