ABB MODVAR Manuel utilisateur

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

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

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.

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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