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M E D I U M V O LT A G E C O M P E N S A T I O N S Y S T E M S
CONDO D2131636
M IКA
MIКA powered by Condensator Dominit
WE DEVELOP, DESIGN AND MANUFACTURE OUR MIКA PRODUCTS IN GERMANY
02
The MIКA product family of Condensator Dominit GmbH stands
for premium systems and sophisticated concepts for compen-
sation and filtering of medium voltage and high voltage grids.
Large industrial plants, renewable energy generators, distri-
bution networks and many other operators of medium voltage
systems face the challenge to insure that their grid connections
comply with all standards and requirements. To ensure such
compliance, a capacitive / inductive componet and/or an appli-
cation specific filter concept is often needed.
The products of the MIКA series provide the appropriate solu-
tion to any problem. We have been your Number One contact
for standard products as well as for customized overall concepts
and the related service ever since 1975. Reference systems in all
parts of the world and a large community of satisfied customers
testify to our high quality and reliability.
Make you grid safe now with MIКA!
MIКA MEDIUM VOLTAGE COMPENSATION SYSTEMS
03
Medium voltage compensation systems
04
POWER QUALITY ISSUES IN HIGH VOLTAGE GRIDS
Frequency converters
Control frequency
UPS systems
Renewable energy generators (wind farms/solar parks)
Motor heavy starting
Inductive loads
Power inverters (e.g. in photovoltaic systems)
Arc and induction furnaces
Welding systems
Cable capacitances
Switching operations by the utility company
Electrolytic processes
Water works / paper machinery
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MIКA powered by Condensator Dominit
DIRECT EFFECTSDeviance from norm
Voltage distortion
Resonance excitation
Voltage asymmetry
Grid load due to distortion reactive power (cos phi)
Transformer overheat
Distortion of the ripple control signal
Voltage fluctuation
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CONSEQUENCESLoss of warranty claims
Reduced life of plant and equipment
Higher noise emission by transformers and consumers
Temperature rise in transmission equipment
Violation of grid connection conditions
Denial of grid connection (by utility company)
Increased CO2 emission
Higher cost
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MEDIUM VOLTAGE CAPACITORS
05
Medium voltage compensation systems
All-film technology
2 to 4 mounting brackets / indoor and outdoor application
1 to 24 kV
Stainless steel housing
Jarylec (PCB free)
Typical use as S01 (1 capacitor per phase)
All-film technology
Low-loss, approx. 0.2 W/kvar
Foldered foil
Faradol 600 / Jarylec (PCB free)
With or without internal fusing
2 to 4 mounting brackets / indoor and outdoor application
1 to 20 kV each capacitor
Suitable for high performance applications > 1 Mvar
Typical use as E03 (3 pcs. with pressure switch), E06/G06 (6 pcs. with unbalance monitor)
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Single-phase capacitors – E &G series
All-film technology
Low-loss, approx. 0.2 W/kvar
Faradol 600 / Jarylec (PCB free)
2 to 4 mounting brackets / indoor and outdoor application
Suitable for medium performance applications > 300 kvar to < 1 Mvar
Typical use as C03 (3 capacitors with unbalance monitor)
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Split-phase capacitors – C series
All-film technology
Low-loss, approx. 0.2 W/kvar
1 to 12 kV
2 to 4 mounting brackets / indoor and outdoor application
Suitable for small performance applications < 800 kvar
Typical use as B01-B03 (1 to 3 capacitors with pressure switch)
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3-phase capacitors – B series
Surge capacitors – S-Series
Example: E/Go6 (YY with converter + unbalance monitor)
Example: C03 (YY with converter + unbalance monitor)
Example: B03
Example: S03
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CBANK
The CBANK product series is the basic
series of the MIКA family. Typical appli-
cations of capacitors without reac-
tors are, for example, transformer or
motor fixed compensation in grids
with negligible harmonic load. The
standard product range includes indi-
vidual capacitors as well as banks of
up to 12 capacitor units. Systems with
single-phase, 3-phase and split-pha-
se capacitors are available. For mo-
nitoring the capacitors units, pressu-
re switches (change over contact for
reporting internal defects) can be in-
tegrate in small power systems whe-
reas larger power systems come with
an unbalance monitor with current
transformer and relay. The mechani-
cally protection concept provides for
IP00 as basic version for installation
in closed electrical operating facili-
06
MIКA-CBANK
FEATURES
Economic construction
Robust design
Optimum natural cooling
Low-loss all-film technology
PCB free
B-/C-/E-/G series
Small power system with pressure switch
High power system with unbalance
monitoring
Hot-dip galvanized and painted hoods
Optional inrush current limiting chokes
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ties, The IP54 version offers shock-
proofness and weather-protection, in
addition.
MIКA powered by Condensator Dominit
More interesting facts about choking: pages 24 to 27.
TECHNICAL SPECIFICATIONS – MIКA-CBANK
Operating voltage
Nominal frequency
Insulation level
Nominal power
Type series
Protection
Ambient temperature
Installation site
Altitude
Impregnating material
Commodity code
Optional
1 kV – 24 kV*
50 / 60 Hz
20 / 60 kV
28 / 75 kV
38 / 95 kV
50 / 125 kV
50 kvar - 9900 kvar*
B series (B01-B03)
(3-phase capacitors + pressure switch)
C series (C03)
(capacitors with 2 power sections) +
unbalance monitoring
E-/G series (E06, G06)
(single-phase capacitor +
unbalance monitoring)
IP00 / IP54*
– 25 °C to +40 °C*
Indoor or outdoor
< 1000 m above sea level
Faradol / Jarylec
85.32.10.00
Inrush current limiting reactors
Terminal box for pressure switch
IP54 housing
TAG number
C5-I finish
* Other versions available on request
Technical modifications and errors excepted
07
Medium voltage compensation systems
LBANK
The LBANK product series of the MIКA
family builds on the CBANK basic versi-
on. Typical applications of reactor pro-
tected capacitor installations of type
LBANK are, for example, transformer or
motor fixed compensation in modern in-
dustrial grids with harmonic load (e.g.,
according to IEC 61000-2/4 class 2). The
LBANK climate concept provides for
the spatial separation of capacitors and
reactor. The reactor and the power
connections of the capacitors are located
within the 2 mm thick housing whereas
the temperature sensitive capacitors are
cooled naturally and are therefore placed
outside. Like CBANK, systems with 1 up
to 12 capacitor units are available. The
system is mounted in a hot dip galvani-
08
MIКA-LBANK
FEATURES
Simply clever
Cooling by convection
Robust design
Low-loss all-film technology
Polygap® choke with double
impregnation
PCB free
Ready to connect
One transport unit
IP34 D housing
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zed steel frame, which makes the system
easy to transport.
MIКA powered by Condensator Dominit
More interesting facts about choking: pages 24 to 27.
TECHNICAL SPECIFICATIONS – MIКA-LBANK
Operating voltage
Nominal frequency
Insulation level
Nominal power
Type series
Tuned frequency
Protection
Ambient temperature
Installation site
Altitude
Impregnating material
Standard
Commodity code
Optional
1 kV - 15 kV*
50 / 60 Hz
20 / 60 kV
28 / 75 kV
38 / 95 kV
50 kvar - 5500 kvar*
B series (B01-B03)
(3-phase capacitors + pressure switch)
C series (C03)
(capacitors with 2 splitted phases +
unbalance monitoring)
E-/G-series (G06, G06/G12)
(1-phase capacitors + unbalance
monitoring)
189 Hz (7 %)* or filter circuit
IP34D*
– 15 °C to +35 °C*
Indoor or outdoor
< 1000 m above sea level
Faradol / Jarylec
IEC 60871-1 / IEC 60071 / IEC 60282-1 / VDE 101
85.37.20.91
Back-up fuse
Unbalanced circuit monitoring relay
Stainless steel terminal box
additional weather roof
and other optional features
* Other versions available on request
Technical modifications and errors excepted
09
Medium voltage compensation systems
10
The MIКA RCOMP series is the system
of choice when large controlled power is
needed.
The rack design makes the RCOMP con-
cept compact and easy to transport. All
components (except the reactor) are
preassembled in the factory and only re-
quire correct positioning on site. Particu-
larly in high-power systems substantially
higher power per step is available than,
for example, from an enclosed system.
The system is installed in a separate lo-
cked electrical equipment room. A se-
parate cabinet (e.g. C-65-A) contains all
required monitoring and control units;
the control cabinet can optionally be
connected to an available process con-
MIКA-RCOMP
FEATURESCompact design
High power per step
Fuse monitoring
Polygap® reactors
Low-loss all-film technology
Robust hot-dip galvanized steel rack
Flexible extension
Optional system visualization and
linkup with PLC
Touch panel in control cabinet
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trol system/centralized instrumentation
and control system.
RCOMP
MIКA powered by Condensator Dominit
More interesting facts about ventilation: pages 24 to 27.
TECHNICAL SPECIFICATIONS – MIКA-RCOMP
Operating voltage
Nominal frequency
Insulation level
Nominal power
Type series
Design versions
Tuned frequency
Protection
Ambient temperature
Installation site
Altitude
Impregnating material
Norm
Optional
1 kV - 24 kV*
50 / 60 Hz
20 / 60 kV bis 50 / 150 kV
150 kvar - 20 000 kvar*
B./C-E- series
-F (fixed step)
-E (with contactor for external actuation)
-A (system with automatic control)
189 Hz (7 %)*
141 Hz (12,5 %)*
LINR inrush current limiting reactors
or filter application
IP00
– 15 °C to 40 °C*
Indoor
< 1000 m above sea level
Faradol / Jarylec
IEC 60871-1 / IEC 60071 / IEC 60282-1 / VDE 101
Phase current transformer
Vacuum contactor or power circuit breaker
Discharge voltage transformer
Voltage transformer, definite-time overcurrent-
time protection, etc.
Control cabinet
Circuit breaker, grounding switch
Oil pan
Surge arrester
* Other versions available on request
Technical modifications and errors excepted
11
Medium voltage compensation systems
ECOMP
The ECOMP product series is a metal-en-
closed, shockproof control cabinet sys-
tem for compensation and filter appli-
cations up to maximum grid nominal
voltage of 15 kV. Typical applications of
this type of system are in electrical ope-
rating facilities. Generally, the ECOMP
system is available in three versions:
ECOMP-F as fixed step with external ac-
tuation without own switching device,
ECOMP-E as externally controlled unit
with integrated contactor, and ECOMP-A
as automatically controlled system with
integrated control and monitoring func-
tions. In addition, the following standard
reactor versions are available with reac-
tors type: LINR inrush current limiting re-
actor), 7 % (189 Hz) or the application as
filter for several harmonics. In addition to
the standard solutions, the ECOMP sys-
12
MIКA-ECOMP
DESIGN VERSIONS
ECOMP-F, equipped with:
HRC fuses, incl. fuse monitoring
1 set of LINR or filter circuit reactors
Position indicator for up-line
power circuit breaker / grounding
switch
Discharge time monitoring
Indicator light - system ready
Indicator light – discharge time running
Indicator light - Fault
Emergency stop switch
Mimic on the front
Door monitoring
Separate low voltage compartment
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tem is ideal for customized projects and
modifications.
ECOMP-E, same as ECOM-F:
+ Vacuum contactor
+ Switching monitoring
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ECOMP-A, same as ECOM-E:
+ Reactive power controller
+ Central control in the incoming feeder unit
+ Optional DMC controller
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MIКA powered by Condensator Dominit
More interesting facts about discharge time: pages 24 to 27.
TECHNICAL SPECIFICATIONS – MIКA-ECOMP
Operating voltageControl voltageNominal frequencyInsulation level
Nominal powerAs filter applicationCapacitor types
Design versions
Tuned frequency
ProtectionAmbient temperature Installation siteAltitudeImpregnating materialNormCommodity codeFinishDimensions (W x D x H)
Optional
1 kV - 15 kV*230 VAC / 220 VDC *50 / 60 Hz20 / 60 kV28 / 75 kV38 / 95 kV50 kvar – 2500 kvar* each stepup to max. 230 Arms each stepB series (B01-B03)(3-phase capacitors + pressure switch)C series (C03)(capacitors with 2 power sections +unbalance monitoring)E-/G series (E03, E06, G06)(single-phase capacitor + unbalance monitoring)-F (fixed step)-E (with contactor for external actuation)-A (system with automatic control)189 Hz (7 %)*Filter applicationLINR inrush current limiting reactorIP21 - IP4xD*0 °C to 35 °C*Indoor< 1000 m above sea levelFaradol / JarylecIEC 60871-1 / IEC 60071 / IEC 60282-1 / VDE 10185.37.20.91RAL 7035Capacitor unit: 1000 x 1200 x 2054 mmIncoming feeder /reactor unit: 800 x 1200 x 2054 mmBase 100 / 200 mm, door lock with discharge time monitoring, discharge voltage transformer, phase current transformer, heating, ventilation, grounding switch, power circuit breaker, definite-time overcur-rent-time protection, etc.
* Other versions available on request
Technical modifications and errors excepted
13
Medium voltage compensation systems
SCOMP
Enclosed medium voltage systems are
frequently preferred solutions whe-
re the safety of the equipment and
of people is important. To provide a
higher level of safety for operators
when a fault (short-circuit/arc inside
the system) occurs, this system type
has strong double walls, door locks,
pressure relief flaps with monitoring,
a sophisticated ventilation concept,
arcing fault deviation plates, parti-
tions between the different units and
a number of other features. Like with
the ECOMP system, the SCOMP also
is available in three versions: -F / -E /
-A. Each of these versions can be im-
plemented both as pure power factor
correction and as filter application. Be
safe, take "Scomp".
14
MIКA-SCOMP FEATURES
Tested for resistance to accidental
arcing 25 kA/15 acc. to IEC 60298
1990 IAC test
Max. grid voltage 12 kV
up to 6 compensation steps
(totally max. 12 Mvar)
Protection IP41D
2 mm thick double walls and doors
Indicator light - Fault
Temperature, unbalance, door and
pressure relief flap monitoring
Large variety of expansion and
enhancement options
Integrated grid analyzer with several
communication interfaces
Door lock
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MIКA powered by Condensator Dominit
More interesting facts about accidental arcing: pages 24 to 27.
TECHNICAL SPECIFICATIONS – MIКA-SCOMP
Operating voltage
Control voltage
Nominal frequency
Insulation level
Nominal power
Capacitor types
Design versions
Tuned frequency
Protection
Ambient temperature
Installation site
Altitude
Impregnating material
Norm
Commodity code
Finish
Dimensions (W x D x H)
Optional
1 kV - 12 kV*
230 VAC / 220 VDC* (fused)
50 / 60 Hz
20 / 60 kV
28 / 75 kV
50 kvar – 2000 kvar* each step
C series (C03)
(capacitors with 2 power sections +
unbalance monitoring)
E-/G series (E03, E06, G06)
(single-phase capacitor +
unbalance monitoring)
-F (fixed step)
-E (with contactor for external actuation)
-A (system with automatic control)
189 Hz (7 %)*
LINR inrush current limiting reactor
IP41D
0 °C to 35 °C*
Indoor
< 1000 m above sea level*
Faradol / Jarylec
IEC 60871-1 / IEC 60071 / IEC 60282-1 / VDE 101
85.37.20.91
RAL 7035
Capacitor unit: 1000 x 1200 x 2054 mm
Incoming feeder / reactor unit: 800 x 1200 x 2054 mm
Discharge voltage transformer, heating, ventila-
tion, voltage transformer, definite-time overcur-
rent-time protection, incoming feeder with
optional breaker / grounding switch, touch panel,
link-up with process control system, etc.
* Other versions available on request
Technical modifications and errors excepted
15
Medium voltage compensation systems
WCOMP
The WCOMP compensation units are the
ideal choice when sensitive components
must be installed outdoors. Medium vol-
tage components and control are instal-
led in a stainless steel station building to
protect them from inclement weather.
This system type is often used as cent-
ral compensation, e.g., of wind farms,
as tele command blocking filter for grid
link-up or as harmonic filter. The housing
dimensions vary from 1.8 to 7 meters
in length and the maximum power is
approx. 7 Mvar (10 kV). As with the R-, E-,
and SCOMP series, the WCOMP also co-
mes in three versions: WCOMP-F as fixed
step with external actuation and without
own switching device, WCOMP-E as ex-
ternally controlled unit with integrated
contactor, and WCOMP-A as automati-
cally controlled system with integrated
control and monitoring functions. In ad-
16
MIКA-WCOMP
dition, four standard reactors versions
are available for this series: LINR (inrush
current limiting reactor), 7 % (189 Hz),
tele command blocking filter applicati-
on or as filter for several harmonics. In
addition to the standard solutions, the
SCOMP system is ideal for customized
projects and modifications.
FEATURES
Patented labyrinth ventilation system
Ready-to-connect overall system
Robust design
Low-voltage section in separate
control cabinet
One transport unit
IP34D
Stainless-steel housing (painted)
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MIКA powered by Condensator Dominit
More interesting facts about IP protection flaps: pages 24 to 27.
TECHNICAL SPECIFICATIONS – MIКA-WCOMP
Operating voltage
Control voltage
Nominal frequency
Insulation level
Nominal power
Capacitor types
Design versions
Tuned frequency
Protection
Ambient temperature
Installation site
Altitude
Impregnating material
Norm
Finish
Dimensions (W x D x H)
Optional
1 kV - 20 kV*
230 VAC / 220 VDC (fused)*
50 / 60 Hz
20 / 60 kV
28 / 75 kV
38 / 95 kV
150 kvar bis 7000 kvar*
B series (B01 – B03)
(3-phase capacitors + pressure switch)
C series (C03)
(capacitors with 2 power sections +
unbalance monitoring)
E-/G series (E06, G06)
(three-phase capacitors +
unbalance monitoring)
-F (fixed step)
-E (with contactor for external actuation)
-A (system with automatic control)
189 Hz (7 %)*
210 Hz (5,67 %)*
LINR inrush current limiting reactor
IP34D*
– 20 °C to 40 °C*
Outdoor
< 1000 m above sea level
Faradol / Jarylec
IEC 60871-1 / IEC 60071 / IEC 60282-1 / VDE 101
RAL 7032
on request
Discharge transformer, heating, lighting, voltage
transformer, definite-time overcurrent-time
protection, pressure relief flaps (roof), forced
ventilation, double locking system, cable grounding
electrode, incoming disconnector, etc.
* Other versions available on request
Technical modifications and errors excepted
17
Medium voltage compensation systems
18
MIКA-BCOMP
MIКA powered by Condensator Dominit
BCOMP
If you need high compensation pow-
er but lack the necessary indoor space
and cannot provide a large fenced-in
area for space reasons, BCOMP is the
right system for you. The use of indoor
components (e.g., iron core reactors), a
full-fledged outdoor system with a very
high power/weight ratio can be confi-
gured. All versions of the BCOMP series
follow a 2-space concept. The power
section (medium voltage components)
is spatially separated from the control/
operating section. Thus, access to the
control section is possible at any time
whereas the power components are pro-
tected by door lock and emergency stop
function. BCOMP systems find frequent
application on wind farms/solar parks or
large industrial facilities. The BCOMP
system is marketed as fixed step (-F), ex-
ternally controlled (-E) or automatically
controlled (-A) version. In addition to
standard reactors, the BCOMP system
can also be designed as customized filter
circuit system.
FEATURES
Turn-key overall concept
Ideal for limited outdoor areas
High power/weight ratio
Can be designed as multi-step filter
concept
F-90 fire resistant walls
Insulated roof
Optional forced ventilation and
air-conditioning equipment
Separate medium voltage and
control spaces
Low noise emission
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More interesting facts about resistance to moisture condensation: pages 24 to 27.
TECHNICAL SPECIFICATIONS – MIКA-BCOMP
Operating voltage
Control voltage
Nominal frequency
Insulation level
Power per step
Type series
Design versions
Tuned frequency
Protection
Ambient temperature
Installation site
Altitude
Impregnating material
Norm
Finish
Dimensions (W x D x H)
Optional
1 kV - 36 kV*
230 VAC / 220 VDC (fused)*
50 / 60 Hz
20 / 60 kV bis 70 / 170 kV
250 kvar to 5000 kvar*
Depending on the voltage level,
capacitor banks of the C series or the
E-/G series are installed
-F (fixed step)
-E (with contactor for external actuation)
-A (system with automatic control)
189 Hz (7%)*
LINR inrush current limiting reactors
on request
– 20 °C to 40 °C*
Outdoor
< 1000 m above sea level
Faradol / Jarylec
IEC 60871-1 / IEC 60071 / IEC 60282-1 / VDE 101
on request
on request
Control cabinet with position indicator, door lock
with discharge time monitoring, discharge
transformer, heating, ventilation, lighting,
voltage transformer, definite-time overcur-
rent-time protection, pressure relief flaps,
visualization system, link-up with process control
system, air-conditioning equipment, etc.
* Other versions available on request
Technical modifications and errors excepted
19
Medium voltage compensation systems
20
MIКA-FILT
MIКA powered by Condensator Dominit
FILT
The MIКA FILT series is specially con-
figured solution for projects requiring
high power indoors and outdoors.
Medium voltage components, particu-
larly at voltages > 20 kV, often have a
large footprint area, maybe because
of the mechanical dimensions or the
required iron-free areas or the pre-
scribed safety distances. Therefore,
the IP00 version often is the most cost
effective or technologically the most
appropriate solution. Outdoor appli-
cations exclusively use air-core reac-
tors. Indoor systems also come with
iron-core reactor. Filter circuits of type
FILT are always specifically tailored to
the requirements in the customer’s
grid and are highly effective in such
grids due to their exact rating. Spe-
cial applications such as tele command
blocking filter or inductive compensa-
tion can also be provided.
FEATURES
Up to 110 kV
Ideal for applications requiring
high power > 5 Mvar
IP00 for indoor and outdoor installation
Air-core or iron-core reactors
Unbalance monitoring
Optional damping resistor
Optional phase current transformer
Optional system visualization and
DMC controller
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More interesting facts about air & iron: pages 24 to 27.
TECHNICAL SPECIFICATIONS – MIКA-FILT
Operating voltage
Control voltage
Nominal frequency
Insulation level
Nominal power
Type series
Design versions
Tuned frequency
Protection
Ambient temperature
Installation site
Altitude
Impregnating material
Norm
Dimensions (W x D x H)
Optional
1 kV - 36 kV*
230 VAC / 400 VAC / 220 VDC (fused)*
50 / 60 Hz
20 / 60 kV to 70 / 170 kV
250 kvar to 70 000 kvar*
G-/F- series (single-phase capacitors
with unbalance monitoring
-F (fixed step)
-E (with contactor for external actuation)
-A (system with automatic control)
189 Hz (7 %)*
Filter application
LINR inrush current limiting reactor
IP23D - IP34D*
– 25 °C to 40 °C*
Outdoor
< 1000 m above sea level
Faradol / Jarylec
IEC 60871-1 / IEC 60071 / IEC 60282-1 / VDE 101
on request
Stainless steel terminal box, discharge transfor-
mer, voltage transformer, definite-time overcur-
rent-time protection, damping resistors, outdoor
power breaker, grounding switch / breaker, DMC
controller, etc.
* Other versions available on request
Technical modifications and errors excepted
21
Medium voltage compensation systems
GRID ANALYSIS
An ideal system design is very often based on detailed and explicit measu-
ring reports and grid analyses of the grid section for which compensation
/ filtering is required. The quality of these reports is very important. Pro-
founded measurements provide the
information for grid calculation and
form the basis of an adequate ap-
plication. Therefore, have your grid
analyzed by professional analyzers
and be sure that your system is opti-
mized for the grid conditions and for
your production processes. We will
be glad to submit our offer for a pro-
fessional analysis.
MIКA SERVICE
ENGINEERING
On the basis of a qualified measuring report and/or of clear customer requirements
and a couple of important marginal items of information (e.g., installation site, am-
bient conditions, application), our team tailors your system exactly to your needs.
The components can either be picked from our wide standard product portfolio, mo-
dified if necessary or designed individual-
ly to your specifications. The overriding
aspects for design and dimensioning are
excellent quality and long service life as
well as cost efficiency and profitability of
the system, guided by the principle: as
much as necessary, as little as possible.
Your system must match you and your
grid and the investment be returned as
quickly as possible.
MIКA® powered by Condensator Dominit
22
23
Medium voltage compensation systems
COMMISSIONING
The moment your system is connected to grid is always an exciting moment also
because the system contains an enormous amount of energy. So, any mistake or
error can be the cause of dramatic damage. Therefore, it is of particular importance
that everything is checked meticulously before the system is connected to the grid.
We are anxious to be part of these preparations and monitor all activities. It goes
without saying that our systems undergo detailed checks before shipment from
the factory. All checks are documented extensively. However, defects may develop
during transport or on site. To detect and repair such defects before the system is
connected to the grid is essential. The-
refore, have your system checked by an
experienced Condensator Dominit en-
gineer before it is connected to the grid.
We suggest that a comparative measu-
rement should be made on this occasion
to document the state before installation
and after connection to the grid.
MIКA SERVICE
MAINTENANCE
Medium and high voltage systems from the MIКA product family are generally
very robust and designed for a long service life. Despite that, the components
are exposed to ageing. Besides, the grids in which the systems are installed
change and along with it the stress to
which the systems are exposed. So, re-
gular maintenance is necessary to ensu-
re the constant system availability. Con-
densator Dominit therefore recommend
customers to have their systems ser-
viced once a year. We will be glad to dis-
cuss this with you.
MIКA powered by Condensator Dominit
24
Unbalance monitoringTechnologically, unbalance monitoring provides the best possible protection of capacitor systems. For this, the capacitor bank is connected as a double star (YY) and the equalizing current measured between the start points.The capacitors are arranged in perfectly symmetrical manner. As a result of this, both star points have the
same potential irrespective of the grid situation. However, every modifi-cation of a component in the capacitor disturbs the balance and gives rise to an equalizing current. Protection systems can be implemented ideally when the equalizing current is measured.Fuses and circuit breakers reduce the damage by failsafe components; unba-lance monitoring already prevents failure.
Inrush current limiting reactorsInrush current limiting chokes limit the current that is flo-wing the moment the capacitor is energized on. This has several advantages:• Reduces the grid side voltage drop during turn-on• Facilitates the design of the up-line power breaker• Easier compliance with selectivity criteria• Unproblematic parallel connection of several capaci-
tor banks• Reduces the inrush current (Î) according to norm < 100 x IN (IEC 60871)
Optimum ventilationOrganic polymers are used as dielectric in capacitors. The service life of these polymers depends strongly on the heat load to which they are exposed and the available cooling.Generally, an open design of the capacitor bank ensures optimum cooling without forced ventilation. However, high power capacitor banks, in particular, generate large amounts of heat, which suggests IP00 as design solution. All Condensator Do-minit capacitors are designed for an expected service life of 15 years, on aver-age.
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Medium voltage compensation systems
Reactor factorCapacitors without reactor, in combination with the transformer or other inductive components of the po-wer supply grid, rise to resonance, which affects the grid quality. To prevent undefined / impermissible grid resonance by the compensation system, choked com-pensation units should be installed in modern industry
grids. The series connection of a reactor and the capacitor generates a defined minimum impedance of the compensation system. The tuned frequency is the result of the reactor factor, which is usually expressed in per cent.
Typical tuning frequences of deturned filter:• 7 % (189 Hz)• 12,5 % (141 Hz)• 14 % (134 Hz)
All compensation systems of the MIКA series are also available as filter circuit design.
Discharge time of capacitorsCapacitors are excellent energy storage devices. When a compensation system is turned off, it must be assumed that the capacitors are still be dischar-ged. This can be a safety risk to persons and when the compensation system is turned on again while the capacitors are still charged, this affects the life of the capacitors and therefore is not recommen-ded.• Unless explicitly agreed otherwise in the purchase order, all medi-
um voltage capacitors delivered by Condensator Dominit are equip-ped with an internal discharge device which ensures norm compliant discharge of the capacitor.
• The standard for medium voltage capacitor systems requires a dischar-ge to 75 V residual voltage within 10 minutes.
• All system controllers from Condensator Dominit ensure that the banks are not switched until the end of a appropriate discharge time.
• Conventional AC voltage testers cannot measure the discharge of a ca-pacitor reliably – Caution: Direct voltage (use a DC voltage tester).
fres = 12 ∏ √LC
p [%] =fn
fres( (
2x 100 %
MIКA powered by Condensator Dominit
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Internal Faults, ArcingThe energy content of an internal faults arc, particularly in a medium voltage system, can be substantial.Generally, the damage an internal fault cau-ses is the greater the higher the voltage, the higher the short circuit power of the grid and
the longer the arc stands. If in a compensation plant the accidental arc occurs down-line the anti-resonance reactor, the arc current is distinctly smaller. The advantage of this is that generally the risk of accidental arcing in a compensati-on system is smaller than in switchgear, but that must be considered when the settings of up-line circuit breakers, if installed, are made.The energy content of an accidental arc that occurs for 1 second at a voltage of the order of 20 kV is equal to the explosive power of about 1 kg T N T for every 10 kA shirt-circuit current!!
IP protection classesThe protection of persons against acciden-tally touching a medium voltage system installed outdoors and for protecting the system from weather and trespassers are very important aspects. In the nomencla-ture of the IP protection class, the first digit describes the dust protection, the second digit describes the protection against the entry of water and in some cases an additional letter provides information about personal protection. Frequently used protection classes have the following meanings:• IP00 – no shock hazard protection, no protection from weather impact, com-
pletely open. Systems of this type must be protected by a fence or installed inside a hall.
• IP21 – protection against solid foreign objects of > 12 mm diameter and water drops from above; systems of this type are suitable, in the first line, for instal-lation in closed indoor equipment rooms.
• IP42 - protection solid foreign object of > 1 mm diameter and water hitting the equipment obliquely; potential installation sites include factory halls with sprinkler systems or outdoor sites.
• IP34D - protection solid foreign object of > 2.5 mm diameter and splash water from any direction; “D” means increased personal protection. A wire or tool entering the system 100 mm will not reach any part live with electricity.
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Medium voltage compensation systems
Resistance to moisture condensationElectrical equipment in closed buildings or sta-tions is protected from direct exposure to we-ather.However, optimum ventilation is essential to the service life of compensation systems instal-led in indoor environments, which means that the equipment is exposed to indirect weather conditions. To resolve this contradiction, the concrete stations of Condensator Dominit consist of two parts.The control electronic component, programmable logic assemblies and other susceptible components are installed in a separate air-conditioned ca-binet or an air-conditioned compartment of the station.These components produce very little heat and air-conditioning is not a pro-blem technically.The actual power components come with double impregnation and other similar treatment to make them insensitive to weather.
Air an iron Iron core reactor are compact, rarely have a strong field, are ideal for indoor environments and provide high inductivities on a small footprint area. Air
reactors need iron-free space around them to avoid magnetic interfe-rence, are ideal for outdoor sites and are suitable, in particular, for high power levels.Typically, air core reactors should be used for applications of 20 kV or more and powers per step of 2.5 Mvar and more. Iron core reactors are generally preferred for voltages below 20 kV or less than 2.5 Mvar po-wer per step.
Condensator Dominit GmbH
An der Bremecke 8
D-59929 Brilon
Phone +49 (0) 2961 782-0
Fax +49 (0) 2961 782-36
E-Mail [email protected]
Web www.condensator-dominit.de