Mv Capacitor Banks Brochure
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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
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7/26/2019 Mv Capacitor Banks Brochure
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
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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
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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
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5/14469E2325.fm/4 Schneider Electric
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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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
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7/14469E2330.fm/6 Schneider Electric
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
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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
Protection against internal faults
MV fuses
unbalance measurement
"switched steps" bank, cubicle
Maximum power (kvar) 1500 4200 1500 7200 7200 7200 7200
control device contactor
switch or CB
Protection against internal faults
MV fuses
unbalance measurement
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469E2330.fm/8
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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)
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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
Additional equipment
Inrush current reactors
rapid discharge reactor
HBC fuses
Unbalance protection relay (supplied separately)
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
Additional equipment
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
Unbalance protection relay (supplied separately)
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11/14469E3340.fm/10 Schneider Electric
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
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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
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Dimensions of MV capacitor banks
Fixed CP banks in cubicle
Nota : the dimensions and weights (not including the capacitor) are shown with the mostcomplete equipment of this type of bank.
Multi stage automatic CP bank in cubicle
Nota : the dimensions and weights (not including the capacitor) are shown with the mostcomplete equipment of this type of bank.
E62619
CP214
E62621
CP227
Model H (mm) L (mm) D (mm) Weight (kg)
CP214 1800 1550 950 340
CP227 2000 2350 1400 350
Model H (mm) L (mm) D (mm) Weight (kg)
CP253 2000 3200 1400 280
CP254 2100 2700 1400 650
CP253
CP254
E62620
E62622
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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