ABB MODVAR Manuale utente
MODVAR Low voltage reactive power compensation modules
Installation manual
3 ABB Instruction manual | MODVAR Low voltage reactive power
MODVAR
Low voltage reactive power compensation modules
Before installation, read this manual carefully and keep
at the disposal of personnel in charge of installation,
maintenance and operation.
1.0 Safety
For the safe use of MODVAR modules, please ensure:
− Installation and maintenance is undertaken only by
authorised and qualified personnel, in accordance with
current local regulations
− Isolation of the equipment from the supply before working
− Wait 5 minutes after isolating supply before handling
− After 5 minutes short-circuit the capacitor terminals with
a piece of insulated cable to confirm discharge
2.0 Inspection on receipt
Inspect the packing and immediately report any damages.
Unpack the MODVAR module and check that:
− Data on the label correspond to those of your purchase
order.
− MODVAR module is not damaged.
− Any loss or damage should be notified immediately to your
nearest ABB agent.
2.1 Storage-transportation-handling
Store indoors, in dry, dust free and non-corrosive
environments, protected from vibrations or shocks.
Storage in initial packing is recommended.
Storage temperature:
− Minimum: -40°C / -40°F
− Maximum: 75°C / 167°F
Failure to follow the safety rules may lead to bodily
injury, premature failure of the capacitors, or other
material damage to installations.
MODVAR Low voltage reactive power | ABB Instruction manual 4
MODVAR segregated
Figure 3.1: MODVAR all in one power modules
Figure 3.2: MODVAR segregated (reactor and capacitors are mounted on
separate trays to reduce thermal stress on capacitors)
3.0 MODVAR modules layout
There are two types of MODVAR modules:
− MODVAR complete in one tray
− MODVAR segregated
MODVAR complete in one tray
1. Discharge resistor
2. Capacitor
3. Reactor
4. Fuse and fuse base
5. Contactor
6. Mounting plate
1. Reactor
2. Fuse and fuse base
(not shown)
3. Contactor
4. Mounting plate
5. Cables
6. Discharge resistors
7. Capacitors
1
1
2
3
3
4
4
5
5
6
6
7
5 ABB Instruction manual | MODVAR Low voltage reactive power
MODVAR
Low voltage reactive power compensation modules
3.1 MODVAR dimensions
Figure 3.3:
MODVAR dimensions
Figure 3.4: MODVAR dimensions
455mm
575mm
8mm fixing holes
R W B
R W B
B
W
R
575mm
472mm
455mm
300mm
MODVAR Low voltage reactive power | ABB Instruction manual 6
4.0 Mechanical installation
MODVAR modules must be fixed on a rigid frame with two M6
screws (not provided).
Make sure that the rigidity of the support and the screws are
sufficient to bear the weight (about 50 kg) of the MODVAR
module(s).
Air clearances: 25 mm to walls and flange to flange between
modules.
MODVAR modules must be fixed horizontally so as
to allow airflow circulation (see blue arrows in the
figure below).
Figure 4.1: MODVAR air flow direction
7 ABB Instruction manual | MODVAR Low voltage reactive power
MODVAR
Low voltage reactive power compensation modules
4.1 Airflow and cooling requirement
The cross-section of air inlet and outlet must be adapted to
the air flow.
Air should flow from the bottom to the top of the cubicle as
illustrated on the opposite picture.
One fan per 6 MODVAR columns blowing a minimum air flow
of 525 m³/h is necessary.
Design guideline
The difference between ambient temperature outside the
cubicle and measured temperature must be lower than 10°C.
To meet that requirement, the temperature probe must be
located on top of the air duct.
The service conditions specified in the IEC 60831–1
section 4 are applicable.
As per IEC 60831-1 section 3.21, the ambient
temperature for capacitors is the air temperature
around the capacitors itself and not around the
cubicle.
Note: An over temperature protection device must
be fitted and set to 55˚C to protect the capacitors
against thermal stress.
Figure 4.2: MODVAR air flow direction
MODVAR Low voltage reactive power | ABB Instruction manual 8
1. Fuses
2. Cable from fuses to
contactor
3. Contactor
4. Cable from contactor to
reactor
5. Reactor
6. Cable from reactor to
capacitor
7. Discharge resistors
8. Capacitors
4.2 Electrical installation
Electrical connection overview
Figure 4.3: MODVAR electrical
connection diagram
Supply cable sizing
The cables must be sized for a current of 1.5 times nominal
current (In) minimum. The nominal current can be calculated
with the following formula:
Formula abbreviations
− Qn - reactive power output in kvar
− Vn - line voltage, phase-to-phase
The temperature around the cables must also be considered
according to cable manufacturer.
1
2
3
4
5
6
7
8
𝐼𝑛
𝑄𝑛
415 √ [1]
9 ABB Instruction manual | MODVAR Low voltage reactive power
MODVAR
Low voltage reactive power compensation modules
Contactor for capacitor switching
Capacitor switching leads to transient operating conditions.
Therefore, the use of standard contactors is not acceptable
and can be dangerous for the safety of people as well as the
installations.
The ABB UA75 contactors are specially designed to switch
capacitors where inrush current peaks are less than or equal
to 100 times nominal rms current.
Earthing
Earthing is achieved through fixing points of the MODVAR
mounting tray.
Fuses and fuse base
The fuses are made with non-isolated gripping lugs, double
indicator and contact blades compliant to DIN VDE 0636 Part
201 and IEC 60269-2-1.
Figure 4.5: HRC fuseFigure 4.4: ABB UA75 contactor
Fuses fit into a three phase bus mounting fuse base
(provided). Suitable for use with up to 30 x 10mm bus
bar.
Please refer to the ABB contactors for capacitor
switching application guide for the contactor’s
dimensions as well as the additional inductance in case
of inrush current peak.
MODVAR Low voltage reactive power | ABB Instruction manual 10
5.0 Commissioning
With the equipment isolated from the supply, check:
− Cabling is properly connected (including earth)
− Ambient ventilation is adequate
− Correct tightness of the connections
6.0 Operation
The MODVAR module capacitor unit is delivered with factory-
installed discharge resistors to comply with IEC 60831 and
allow a decrease of the residual voltage to less than 50V after
1 min. disconnection from supply.
During operation, make sure the delay before the MODVAR
is re-energised is not shorter than 40 sec. Failure to follow
this rule may cause damage to and reduce the lifetime of the
capacitor.
Harmonics
Installation of capacitors on networks disturbed by harmonics
may require special precautions especially when there is a risk
of resonance phenomena. Please ensure that your installation
is as per the over current rating according IEC 60831
standards. Contact ABB for technical support.
7.0 Maintenance
Ensure safety procedures are completed (see paragraph
“1.0 Safety”). Maintenance frequency depends on working
conditions. As minimum annual maintenance should include:
− Removal of dust deposits, cleaning of all parts.
− Check of tightness of all electrical connections.
− Check of ambient temperature.
− Check condition of discharge resistors.
− Check for capacitance of CLMD capacitors.
MODVAR module discharge devices are not suitable
for use with rapid switching. (Minimum off time: 40
sec)
11 ABB Instruction manual | MODVAR Low voltage reactive power
MODVAR
Low voltage reactive power compensation modules
Voltage range 415V, 50Hz
For other voltages please consult ABB
Connection Three phase
Net output power Q at 415V 12.5kvar, 25kvar, 50kvar
Discharge resistors Included
Discharge time: less than 50V in 1 minute
System connection Fuse base mounted on busbar (max 30x10mm)
Earth Earth the mounting plate
Fixing Two M6 screws to the supporting rail (M8 holes on mounting plate)
Protection degree(according to IEC 60529) IP00
Installation Indoor
Weight 12.5kvar 25kg
25kvar 35kg
50kvar 50kg
Maximum ambient temperature Class D according to IEC60831:
Maximum average over 1 year: 35°C
Maximum average over 24h: 45°C
Minimum ambient temperature -25°C
Fuse ABB gG or gL 50, 63, 100 and 125 A
Contactor ABB UA75
Control voltage: 230/240V at 50Hz
Required clearance 25 mm minimum to walls
Capacitor losses Less than 0.5 W/kvar (discharge resistor losses included)
Contactor and fuses losses With UA75 contactor: 0.82 W/kvar
Tolerance on capacitance 0% +10 %
Capacitor voltage test Between terminals: 2.15xUn for 10 seconds
Between terminals and earth: 3kV for 10 sec: Un ≤ 450V
Lightning impulse voltage: 8 kV: Un ≤ 690V
Overload capability
(according to IEC 60831)
Overvoltage tolerance: 10% for maximum 8h in every 24h and 30% for maximum 1min
Maximum permissible current: 1.3x In.
Altitude Up to 1000m
Compliance IEC 60831 part 1 & 2
CE marked
8.0 Technical specifications
Cooling Forced air cooling:120cm3/h
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