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  • D Y N A M I C V O L T A G E R E S T O R E R

    CONDO D2061511

  • 02

    OSKR powered by Condensator Dominit

  • OSKR setting new standards in power quality.

    Voltage dips in the electrical power supply are one of the main reasons for ex-

    pensive unscheduled production outages. The voltage range of +-10 % of the

    nominal voltage defined in EN 50160 has to be guaranteed by the utility only in

    95 % of the 10 minute average values. Incidents which are shorter than 10 minu-

    tes cannot be avoided and may not be criticized.

    IEC 61000 2-8 describes the impacts of voltage dips. If the remaining voltage is

    less than 85 % of the nominal voltage, typically problems with frequency conver-

    ters and switch-mode power supplies will occur. According to own investigations

    commercially available contactors are in an undefined status if the voltage goes

    down to 80% of nominal voltage, even if the voltage dip lasts only for one period

    (20 ms).

    Also rugged consumers like asynchronous motors will be affected if the voltage

    drops to less than 75 % of the nominal voltage for several periods.

    OSKR keeps the grid vol-tage highly dynamic at the

    desired target value and the

    load will ride through typical

    voltage dips without even ta-

    king notice. Typical voltage

    dips will be passed through

    brilliantly. Reach a new le-

    vel of power quality with

    OSKR!

    OSKR ONLINE-SUPPLY-KORRECTION WITH ADAPTIVE REGULATION

    03

    online-supply-korrection with adaptive regulation

  • DIRECT EFFECTSCircuit breakers of the utilities trip (typical reaction time 100-150 ms)

    Local events spread through the mains

    Contactors and relays drop off

    Measuring devices and sensors detect wrong values

    Frequency converters fails

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    04

    OSKR powered by Condensator Dominit

    REASONS FOR VOLTAGE DIPS IN THE MAINS POWER SUPPLY

    Short-circuits in the distribution grid

    Strikes of lightening

    Heavy loads

    Big load changes

    Switching operations of utilities

    Turn on- and turn off of power plants

    Instabele energieproduction (wind-/solar farms) renewables

    Birds and bird droppings

    Other events

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    CONSEQUENCESProduction processes stop

    Production quality criteria are violated

    Financial losses arise

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  • 05

    online-supply-korrection with adaptive regulation

    OSKR-GRID-PROTECTION

    Realtime voltage correction (< 1 ms)

    Circuit power remains nearly unchanged

    Voltage dips down to 40 % of the nominal voltage can be corrected

    Efficiency > 98 %

    Extended operation is possible

    Protection against overvoltages

    No energy storage needed

    Minimal space requirements

    Low purchase and maintenance costs

    u

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    PRO

    PUMV

    circuit breaker/fuse

    LV

    protected loads

    PUMV

    LV

    protected loads

    unprotected loads

    PUMV

    LV

    To protect production processes, OSKR will be connected between the supplying transformer

    and the load(s). The short circuit power remains

    nearly unchanged by adding OSKR. All selec-

    tivity criteria for fuses and circuit breakers remain

    unchanged. OSKR can be extended by modu-les and is therefore sufficient for protecting single

    machines as well as complete supply systems.

    unprotected loads

  • OSKR is equipped with an online con-trol which keeps the voltage continuously

    at the desired value:

    400 V ordered, 400 V delivered!

    As soon as OSKR detects a difference between the real voltage and the targed

    voltage it starts to adjust with a reaction

    time of 140 s.

    The voltage dip is fully corrected in less

    than half a cycle.

    3 phase voltage dips of up to 40 % and

    overvoltages of up to 20 % are corrected.

    OSKR-FUNCTION PRINCIPLE

    incoming line transformer load

    Bypass

    DC-Bus

    AC/DC-rectifier

    DC/AC-inverter

    DC-Bus

    06

    OSKR powered by Condensator Dominit

  • 07

    online-supply-korrection with adaptive regulation

    rectifier-module

    inverter-module

    bypass-module

    transformer cell

    SET-UP

    OSKR is executed as conventio-nal switchgear where all components

    necessary to ensure a perfect voltage

    are mounted inside a cubicle. The seri-

    al coupling (or injection) transformer is

    located encapsulated in the lower sec-

    tion of the cubicle and directly fixed on

    the base. The power electronic modules

    are located in the upper part of the cu-

    bicle. The power electronics consist of

    three functional units, one rectifier-, one

    inverter- and a bypass-module. Further

    technical details are described on

    page 11.

    transformer control

    OSKR 300 kVA

  • 08

    OSKR-COOLING SYSTEM

    OSKR powered by Condensator Dominit

    A sophisticated ventilation system is im-

    plemented in order to remove the losses

    during operation ( 3 kW) appropriately

    out of the cubicle. In the lower section two

    powerful fans guarantee a sufficient inco-

    ming airflow which is guided directly into

    the transformer compartment. This air-

    flow is then guided between the backwall

    and the segregation wall behind the power

    electronic modules directly to the air out-

    lets at the roof. Each power electronic mo-

    dule has its own fans which blow air from

    the middle part of the cubicle through the

    modules. The hot air will be dissipated th-

    rough the back-wall and ventilation grids

    located in the upper part.

  • 09

    online-supply-korrection with adaptive regulation

    BYPASS

    In the case of a short circuit on the

    load side or under overload conditions

    OSKR switches into bypass mode.The Bypass protects the power electro-

    nic components of OSKR. This also insures, that the short circuit power on

    the load side remains unchanged and

    fuses and circuit breakers as well as

    other protection equipment operate in

    the usual way.

    The multiply redundant designed

    bypass ensureds, that the maximum

    short circuit power is provided when it

    is needed.

    The short circuit power is an important

    quality aspect of every electrical ener-

    gy supply system regardless of whether

    operation is disrupted or not. Harmonic

    currents have a lower impact, the hig-

    her the short circuit power is.

    With its uk of < 2,5 %, the serial coup-

    ling transformer of OSKR is dimen-sioned for a short circuit power of 40

    times of its rated power.

    u Thyristor switch for bypassing without any delay

    u Bypass contactor for over- load and short circuit

    u Redundant 2nd bypass contactor for short circuit on

    the load side

  • OSKR-MEASURING RESULTS

    Theory and practice must not necessarily

    deviate from each other. The characteristic

    curves taken into account for the OSKR design have been proved in reality.

    The achievable correction values of

    OSKR are shown in the diagrams for three-phase and single-phase volta-

    ge dips. Measured values, monitored in

    customer installations, show, that the sta-

    ted correctional values are always achie-

    ved by the system. The result of the con-

    trolled output voltage has a difference to the

    target voltage (with load) of about 0,625%.

    Such a virtually ideal voltage characteris-

    tic can never been seen in a grid without

    OSKR.

    10

    OSKR powered by Condensator Dominit

    effective value of load current

    effective value of load voltage (output L1)

    effective value of load voltage (output L2)

    effective value of load voltage (output L3)

    effective value of supply voltage (incoming)

  • TECHNICAL DATA OSKRSystem concept

    Rated power

    Nominal network voltage

    Rated frequency

    Network configuration

    Grid short circuit power

    Correction range

    Single-phase dips

    Three-phase dips

    Overload capability

    Overload in bypass-mode

    Accuracy of the output voltage

    Accuracy during voltage dips

    Reaction time

    Transient time

    System efficiency

    Communication

    Parametrization/Analysis

    Degree of protection

    Ambient temperature

    Dimensions (w x d x h)

    Weight

    Power connection

    Height of connection points

    Door hinges

    Ordering code

    Options

    modular

    300 kVA*

    400 V*

    50/60 Hz 5 %

    3-phase, TN

    scalable

    40% for 30 s and 10% continuously

    40 % UN 100 % (30 s)

    60 % UN 100 % (30 s), 50 % UN 90 % (15 s)

    150 % IN (30 s)

    20 kA / 150 ms, 40 kA / 10 ms

    1 %

    3 %

    140 s

    < 10 ms

    > 98 %

    Ethernet (RJ45) / FTP-Server / Mail-Server / Modbus

    touch panel / Log-SD-Card / Mail

    IP 20D*

    0 C (min.), 40 C (max.)

    600 x 800 x 2282 mm (incl. socket)

    900 kg

    from the bottom

    incoming 800 mm, outgoing 370 mm

    right

    OS 300 - 400 - 40 %

    Maintenance bypass for bridging the system,

    Measuring device for independent analysis Class A

    * Other ratings on request

    Subject to changes

    11

    online-supply-korrection with adaptive regulation

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