Mv Capacitor Banks Brochure

7/26/2019 Mv Capacitor Banks Brochure

1/14

Pow er factor correction

and harm onic filtering

M V capacitors and banks

R ectiphaseCatalogue

2000


2/14Schneider Electric 469E1315.fm/1

Contents

Presentation 2

MV capacitors and banks 2

Propivar capacitors 4

MV capacitor banks 6

Dimensions of Propivar capacitors 10

Dimensions of MV capacitor banks 11


3/14469E1320.fm/2 Schneider Electric

PresentationMV capacitors and banks

Compensation of reactive power on anetwork or in an electrical installation has

various economic and technicaladvantages:

b

economic advantages in that it cuts downon electricity bills through elimination ofexcessive consumption of reactive power.

b

technical advantages in that it:

v

increases power available at thesecondary of the transformers

v

reduces voltage drop in MV distributionnetworks

v

reduces temperature rise in cables forconstant active power.

Choosing reactive power compensation equipment

The method proposed comprises 4 successive steps.

Step 1: calculating the reactive power to be compensated:

b

from the electricity bill: the aim is to eliminate the reactive power billed or reducethe subscribed power. This will depend on the tariffs in force in each country.

b

from the electrical data of the installation. The aim is not to pay for reactive powerconsumption and to correctly size transformers, cables, control and protectiondevices.

Step 2: choosing the compensation mode

Location of capacitors on electrical networks forms what is known as the"compensation" mode.Compensation of reactive power can be (see fig. below):

b

either global, example:

v

HV capacitor bank 1

on HV distribution / transmission network

v

MV capacitor bank 2

for MV customer

v

regulated or fixed LV capacitor bank 3

for LV consumer.

b

or by sector, example:

v

MV capacitor bank 4

on MV distribution network

v

LV 5

or MV capacitor bank per workshop or per building for MV customer.

b

or by unitThe capacitor bank 6

is parallel-connected to the machine consuming the reactivepower.This compensation type is an ideal solution, technically speaking, as the reactivepower is produced where it is consumed in quantities to meet the demand.

Step 3: choosing the compensation type

Compensation may be:

b

fixed by delivering a constant reactive power

b

automatic by delivering a variable reactive power compensating the powerconsumed by the load.

Step 4: choosing compensation equipment in networks disturbed byharmonics

Presence of non-linear loads (speed controllers, UPS...) creates harmonic voltagesand currents. Compensation equipment is chosen according to the size of theseharmonics.This choice takes the following parameters into account:

b

Gh: power in kVA of all the harmonics generators supplied by the same busbarsas the capacitors.

b

Scc or Sn:

b

Scc: real short-circuit power (kVA), if supply is via one or more > 2 MVA powertransformers

b

Sn: power of the upstream transformer(s) (kVA) if supply is via one or more< 2 MVA power transformers.

E62610

E29121

Power factor correctionand harmonic filtering


4/14

469E1320.fm/3

Schneider Electric

PresentationMV capacitors and banks (cont.)

Based on these parameters there are 4 possible cases:b

using standard banks when there are few or no harmonics

b

using banks with oversized capacitors

b

using capacitor banks associated with detuning reactors which limit the harmoniccurrents absorbed

b

using harmonics filters to reduce harmonic currents by filtering them at their pointof creation.The solution consists in arranging sets of capacitors and inductances in the form oftuned filters to:

b

compensate the reactive consumption of the installation

b

absorb the main harmonic currents.The experience acquired in this area allows us to define some simple rules (see tablebelow).

Choosing CP type banks

Configuration : is used for voltages less than 12 kV and maximum power1500 kvar.

Configuration double star : for every voltage and power.

Filtering harmonics

To improve electrical power quality, Merlin Gerin proposes HV or MV filters whichreduce or eliminate the harmonics flowing in the electrical installation.

These filters are made up of capacitors associated with reactors. They reduce thedistortion rate to a value permissible to or recommended by the electricity board orclients system as well as compensate reactive power.Merlin Gerin will conduct all compensation and filtering studies.

Sn > 2 MVASn < 2 MVA

Gh y

Scc/120Gh y

0.15 SnScc/120 < Gh y

Scc/700.15 Sn < Gh y

0.25 SnScc/70 < Gh y

Scc/300.25 Sn < Gh y

0.6 SnGh > Scc/30Gh > 0.6 Sn

Standard equipment Equipment with oversizedcapacitors

Equipment with detuningreactors and capacitors

Harmonic filters

E62611




Propivar capacitors

The Propivar capacitors are used tocompensate reactive power on medium and

high voltage networks.

Presentation

A Propivar medium voltage capacitor is a steel case or tank provided with resininsulators. The tank comprises an assembly of capacitor elements having a

maximum permissible rated voltage of 2250 V.When connected in series-parallel groups, they provide high power units for elevatedsystem voltages.There are two types of capacitors:

b

with internal fuses (single-phase capacitor)

b

without internal fuses (three-phase or single-phase capacitor).Each capacitor is normally provided with discharge resistors to bring the residualvoltage down to 75 V 10 minutes after the capacitor has been switched off.If requested, the capacitors can be supplied without discharge resistors.

Construction

The Propivar capacitors are composed of elements which include:

b

aluminium foil electrodes;

b

a non-chlorinated biodegradable dielectric liquid and a polypropylene film.The dielectric solely made up of plastic films helps to greatly reduce dielectric losses.

Compliance with standards

The Propivar capacitor complies with standard NF C 54-102 and with the followingstandards:

b

IEC 871, 1 and 2

b

BS 1650

b

VDE 0560

b

C22-2 N190-M1985

b

NEMA CP1.Capacitors with internal fuses comply with the following standards: NF C 54-102,IEC 60871.

Protection by internal fuse

Propivar capacitors can be supplied with internal protection: each element or unitcapacitor is equipped with a fuse. In the event of a breakdown of an element, theelement is disconnected and isolated. Breakdown of a unit capacity may occur:

b

when capacitor voltage is close to its maximum amplitude. In this case, it is thepower stored in the capacitances of the parallel elements which guarantees a current

sufficient to rupture the internal fuse (fig. 1)

b

when capacitor voltage is close to zero. This current ensures breaking of theinternal fuse (fig. 2).Advantages of this protection type:

b

instantaneous disconnection of the short-circuiting element

b

continuity of service is ensured

b

considerable increase in the life of the equipment

b

reduction in material costs and maintenance

b

possibility of programming site maintenance.

Main characteristics

b

The exceptional life of Propivar capacitors is due to their temperature withstand,small temperature rise, chemical stability and overvoltage and overcurrent withstand.

Temperature withstand

These capacitors can be put into service at low temperatures without any special

precautions being taken.At higher ambient temperatures, the temperature rise is very low, so they can beoperated without any risk of modifying the insulation characteristics of the dielectric.

Chemical stability

Transient overvoltages in circuits and partial discharge levels in tanks causeaccelerated ageing of capacitors. The exceptional life of Propivar capacitors isclosely connected with the intrinsic properties of the dielectric liquid:

b

very high chemical stability

b

high absorption capacity for gases generated during partial discharges

b

very high dielectric strength.

Overvoltage and overcurrent withstand

The capacitors can accept:

b

an overvoltage of 1.10 Un for 12 hours a day

b

a power frequency overvoltage of 1.15 Un for 30 minutes a day

b

a permanent overcurrent of 1.3 In.

The withstand of capacitors is verified by:

b

1 000 cycles at an overvoltage level of 2.25 Un (cycle duration 1 s)

b

ageing tests at 1.4 Un.

052312

Propivar capacitor 250 kvar/17.5 kV

E14591

Propivar capacitor with internal fuses, composed of 4 groupsconnected in series, each group comprising 12 elementsconnected in parallel.

E14445A

Fig. 1

E14445B

Fig. 2



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469E2325.fm/5

Schneider Electric

Propivar capacitors

Insulating voltage of the Propivar capacitors

Environmental protection / biodegradability

Propivar capacitors are biodegradable and are certified in accordance with therecommendations in force.The total absence of PCB makes them perfectly compatible with the environment.No special precautions are required in installing them.

Other characteristics

The rated reactive power of the unit capacitors is 100 to 600 kvar, according to ratedvoltage (see tables opposite).The capacitance of the capacitors is always between 0.95 and 1.15 times ratedcapacitance. Other intermediate powers can be offered on request.

Choice

The three tables opposite present the range of Propivar capacitors.

Single-phase capacitors without internal fuses

for Um voltages 7.2 - 12 - 17.5 - 24 - 36 kV/50 Hz (*)

Nota : Um = highest network voltage

Single-phase capacitors with internal fuses

for Um voltages 7.2 - 12 - 17.5 - 24 - 36 kV/50 Hz

Three-phase capacitors without internal fuses

for Um voltages 7.2 - 12 kV/50 Hz

(*) for 60 Hz, please contact us

Highest voltage for equipment Um

kV 3.6 7.2 12 17.5 24 36

Insulation level

Rms kV, 50 Hz-1 mn 10 20 28 38 50 70

Basic impulse level (BIL) kV, 1.2/50 s 40 60 75 95 125 170

Service frequency 50 Hz - (60 Hz if requested)

Temperature range -25 to +45 C (other ranges, if requested)

Average loss factor at 20 Cafter stabilisation 0.16 W/kvar with internal fuses0.12 W/kvar without internal fusesCapacitance variation

C/C -3.5 . 10

-4

/CConnection to porcelain or resin insulators for cables with a section y

50 mm

2

Tank welded steel thickness 1.5 mmpaint vinyl

colour grey RAL 7038anticorrosion treatment indoor type wash-primer, thickness 5 m

paint, thickness 20 moutdoor type sanding

metallisation, 80 m of zinc

wash-primer and paint: thickness 20 mFixingsystem

2 perforated brackets for M10 screw

Power(kvar)

Rated (kV) voltage1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.8 9.1 11.4 13.8

100 to 150150 to 200

200 to 250250 to 300300 to 350

350 to 400400 to 450

450 to 500500 to 550

550 to 600

Power(kvar)

Rated (kV) voltage

1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.8 9.1 11.4 13.8100 to 150150 to 200

200 to 250250 to 300

300 to 350350 to 400

400 to 450450 to 500500 to 550

550 to 600

Power(kvar)

Rated (kV) voltage1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.8 9.1 11.4 13.8

100 to 150150 to 200200 to 250

250 to 300300 to 350

350 to 425425 to 500




MV capacitor banks

The Propivar capacitor banks are used tocompensate reactive power on medium

voltage networks.

Presentation

Composition of capacitor banks

Merlin Gerin designs all types of capacitor banks whatever:

b

the complexity of the system (calculation of the filter)

b

the desired reactive power

b

the rated insulating voltages.For easier selection, Merlin Gerin has standardised its capacitor equipment andoffers two versions:

b

in open rack IP 00

b

in cubicle IP 23, with or without control devices.The capacitor banks are designed according to two capacitor connection modes:delta connection or double star connection.Cubicles increase:

b

safety of operating personnel by protecting them from contact with live parts andintegrating the switching and protection functions

b

continuity of service by reducing electrical faults by isolation of live par ts.The capacitor bank control equipment is incorporated into the cubicles containing thecapacitors when:

b

compensation is on an individual basis, for each machine consuming largequantities of reactive power

b

the capacitor banks in the system are separate and distributed throughout theinstallation

b

multi stage automatic compensation is required.

Capacitor protection

Capacitors must be protected against short-circuits and earth faults.Current and voltage overload protection is also recommended.

Bank with delta-connected capacitors (fig. 3)

These capacitors must be protected by a device that trips quickly should an internalfault occur. Only limiting HBC fuses can provide such protection. Their rating mustbe at least 1.8 lN. The exact determination of the rating requires knowledge ofinstallation data. A circuit-breaker alone does not provide sufficient protection.

Banks with single-phase capacitors (fig. 4)

To provide protection against capacitor internal faults, a double-Y assembly withunbalance detection must be used. This system can be used with capacitors with andwithout internal fuses. The setting thresholds of this protection depend on the internaldata of the devices and must be supplied by Rectiphase or Merlin Gerin. Suchprotection causes the switching device at the incoming end of the bank to open.Overload and short-circuit protection must be installed to protect the bank.

Overcurrent and overvoltage protection devices:

b

the stresses:MV capacitor banks require protection against:

v

risk of overvoltage due to rapid reclosing before capacitor discharge

v

overcurrents on switching, load overcurrents often present on bank step switching.

b

the means: installation of two discharge coils between the phases reduces toroughly 10 s capacitor discharge time. Use of this device must, however, respect coilcooling time, i.e. operations performed at intervals of at least 6 minutes.

Damping reactors placed in series on the connections of each step limit the switchingovercurrents.

Open rack type capacitor banks

The banks are fixed. Always used for a voltage greater than 36 kV. But this versionis used in high power equipment and for all voltage levels. The indoor and outdoortypes are provided with an unpainted aluminium rack.This version also comprises item CP210 which is designed for low power individualcompensation and includes a terminal cover.

Capacitor banks in IP 23 cubicles

b

fixed type banksThis equipment is suitable for indoor or outdoor use with:

v

an unpainted aluminium rack

v

unpainted aluminium panels.The cubicles are furnished with a bottom gland plate:

v

for 1 to 6 capacitors: 1 gland 100 mm dia.

v

for more than 6 capacitors: 3 glands 100 mm dia.

b

multi stage automatic banks.These banks are designed in the same way as fixed banks.They also include control equipment.

052314

CP225 fixed capacitor banks

052323

CP254 automatic capacitor banks



8/14

469E2330.fm/7

Schneider Electric

MV capacitor banks

Choice of switching devices

The fitness of the devices to switch capacitive currents must be checked with themanufacturer.

Current sizing

Breaking and protection devices must withstand a continuous current of 1.43 timesrated bank current.

Withstand to switching transients

Switching devices must withstand the transient overcurrents that occur onenergisation. For banks parallel-connected to the same busbar, use of limitingreactors to reduce switching currents is essential.

Rearcing

Switching devices must be suited for the switching of capacitive currents. Thesedevices must be designed to avoid the risk of reacing on opening. If the rearcing riskis high (case of some off-load devices), surge arresters must be fitted to limit thetransient overvoltages.Merlin Gerin devices with SF6 are well adapted to capacitive current operations.Please consult us for more details

Connection mode

The equipment can have different forms:

b

delta connection:

v

three-phase capacitors (without internal fuse) connected in parallel

v

single-phase capacitors (without internal fuse).

b

double star connection: from 6 to 48 single-phase capacitors (with or withoutinternal fuse)

b

single star connection (special for EHV) 36 single-phase capacitors(12 per branch) if requested.The selection depends on:

b

the following characteristics: network voltage and capacitor bank power

b

the type of compensation, fixed or controlled (switched steps)

b

the type of protection:

v

capacitor with or without internal fuse

v

unbalance current with MV fuses.

b

economic requirements. In response to this last point, it should be noted that thecost of a capacitor bank is a direct function of the number of elements: with identicaloperating characteristics, a system composed of three capacitors with a deltaconnection is therefore cheaper than a system composed of six single-phasecapacitors with a double star connection.

Standard assemblies

Aside from the capacitors, the banks standardised by Merlin Gerin include theelements mentioned in the opposite table. Any power available on request.

E29126

Fig. 3: example for delta connection

E29128

Fig. 4: example for double star connection

Rated voltage Un (kV)

yyyy

6.6 6.6 to 11 11 to 15.6 15.6 to 21.8 21.8 to 32.7 > 32.7

Highest voltage Um (kV) 7.2 12 17.5 24 > 24

Connection mode delta

double star

Fixed bank, open rack

Maximum power (kvar) 1500 4200 1500 21000 36000 36000 36000 all powers

Protection against internal faults

MV fuses

unbalance measurement

Fixed bank, cubicle

Maximum power (kvar) 1500 4200 1500 7200 7200 7200 7200


MV fuses


"switched steps" bank, cubicle

Maximum power (kvar) 1500 4200 1500 7200 7200 7200 7200

control device contactor

switch or CB


MV fuses




9/14

469E2330.fm/8

Schneider Electric

MV capacitor banks

Fixed CP banks with terminal cover

Characteristics

(*)

capacitor protection is ensured using HBC fuses (not supplied)

Fixed CP banks with open rack

Characteristics

(1)

the equipment can be used outdoor if the fuse option is not chosen.

(2)

please consult us for higher powers.

E2912

5

CP210

Type of bank

CP 210 (*)

fixed

Capacitors numbers 1, 2 or 3

type three-phase

Connection delta

Rack open with terminal cover

Protection index IP 23

Indoor yes

Outdoor yes

Maximum insulat ing voltage 12 kV

Max. power 1500 kvar

E29126

CP212

E29128

CP225

E29127

CP229

E29129

CP230

Type of bank

CP212

fixed

CP225

fixed

CP229

fixed

CP230

fixed

Capacitors numbers 1, 2 or 3 6, 9 or 12 60 maxi as required

type three-phase single-phase single-phase single-phase

Connection delta double star double star double star

Equipment on rack open open open open

Indoor yes yes yes yes

Outdoor no (1)

yes yes yes

max. insulating voltage 12 kV 36 kV 36 kV > 36 kV

Max. power (2)

1500 kvar 7200 kvar 36000 kvar all powers

Additional equipment

Inrush current reactor

Rapid discharge reactor

HBC fuses

Unbalance protection relay (supplied separately)



10/14

469E2330.fm/9

Schneider Electric

MV capacitor banks

Fixed CP banks in cubicle

Characteristics

Multi stage automatic CP banks in cubicle

Characteristics

E2912

6

CP214

E29127

CP227

Type of battery

CP214

fixed

CP227

fixed

Capacitors number 1, 2 or 3 6, 9 or 12

type three-phase single-phase

Connection delta double star

Equipment in cubicle in cubicle

Indoor yes yes

Outdoor yes yes

Max. insulating voltage 12 kV 36 kV

Max. power (2)

1500 kvar 7200 kvar


Inrush current reactors

rapid discharge reactor

HBC fuses


E29132

CP253

E29133

CP254

Type of battery

CP253

m odulable steps

CP254

m odulable steps

Capacitors number 1, 2 or 3 6, 9 or 12

type three-phase single-phase

Connection three-phase double star

Equipment in cubicle in cubicle

Indoor yes yesOutdoor yes yes

Max. insulating voltage 12 kV 36 kV

Max. power 1500 kvar 7200 kvar


MV equipment: Inrush current reactors

Rapid discharge reactor

Earthing switch

Control device with- Rollarc with HBC fuses- Fluarc SF1 circuit breaker

LV equipment: Regulator (automatic controller)

Manual remote control

"on" and "fault" signals





Dimensions of Propivar capacitors

Propivar capacitors

Dimensions (mm) and weight (kg) of banks (for information only)

Single-phase and three-phase capacitors

E62612

Single-phase Propivar capacitor

E62613

Three-phase Propivar capacitor

Single-phase capacitors Three-phase capacitors

Powers(kvar)

with internal fuses without internal fuses without internal fuses

50 Hz H P masse H P masse H P masse

100 320 130 25 270 130 21 280 130 24

150 390 135 31 360 130 27 370 130 30

200 460 140 36 430 140 34 460 135 37

250 530 145 42 510 140 39 530 140 43

300 610 145 48 590 140 45 620 140 49

350 650 155 54 630 150 51 640 150 53

400 710 165 62 670 160 57 700 160 61

450 780 165 68 760 160 64 760 160 65

500 770 185 74 740 180 69 760 180 72

550 840 185 80 810 180 75

600 900 185 86 870 180 80

Connection

on resin insulators for cables with a section y

50 mm

2

overall external height (b) of terminals 135 mm for voltages y

7.2 kV

233 mm for voltages12 and 17.5 kV

282 mm for voltages 24 kV

377 mm for voltages 36 kV

Fixing system

2 performed brackets for M10 screw pitch 401 5 mm

height (h), from top of tank to fixingbrackets

150 mm for voltages y

7.2 kV

180 mm for voltages > 7.2 kV



12/14469E3345.fm/11Schneider Electric

Dimensions of MV capacitor banks

Fixed CP banks with terminal cover

Nota : the dimensions and weight (not including the capacitor) are shown with the most completeequipment.

Fixed CP banks on open rack

Nota : the dimensions and weights (not including the capacitor) are shown with the mostcomplete equipment of this type of bank.

E62614

CP210

H (mm) L (mm) D (mm) Weight (kg)

1300 750 600 10

Model H (mm) L (mm) D (mm) Weight (kg)

CP212 1600 1500 700 150

CP225 2000 2300 1200 200

CP229 1950 3100 2200 400CP230 3000 3100 2200 450

CP225

CP229

CP230

E62616

E62618

E62615

CP212

E62617



13/14

469E3345.fm/12

Schneider Electric

Dimensions of MV capacitor banks

Fixed CP banks in cubicle


Multi stage automatic CP bank in cubicle


E62619

CP214

E62621

CP227


CP214 1800 1550 950 340

CP227 2000 2350 1400 350


CP253 2000 3200 1400 280

CP254 2100 2700 1400 650

CP253

CP254

E62620

E62622



14/14

Schneider Electric Industries SA

RectiphaseBP1074371 Pringy cedexFranceTel.: (33) 04 50 66 95 00Fax: (33) 04 50 27 24 19

As standards, specifications and designs develop from time to time, always ask for confirmation

of the information given in this publication.

This document has been printed on ecological paper

Design: Schneider Electric - AMEGPublication: Schneider ElectricPrinted: Colorpress - 1500 ex.

AC0469E/2

2000

SchneiderElectric-Allrightrese

rved

Documents

Mv Capacitor Banks Brochure