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Low voltage pfc

Low voltage pfc
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Low voltage pfc

Product catalog summary
General Information:
Power factor correction equipment is crucial for enhancing electrical system efficiency by minimizing reactive power, which can incur additional costs and stress on transmission lines. The document describes various power factor correction banks, including individual, group, and central corrections, as well as automatic systems with harmonic filters.
Reactive Power and Compensation:
Electrical devices often require reactive power, which can be compensated by installing capacitors. The document details the sources and effects of reactive power and offers methods for compensation, including formulas for calculating the necessary corrective power based on energy consumption and operating hours.
Methods of Power Factor Correction:
Three primary methods are discussed: individual correction for larger consumers, group correction for multiple consumers, and central correction from a central location. Detailed calculations for determining the required capacitor rating are provided using specific formulas and tables.
Examples and Calculations:
Examples illustrate the calculation of required corrective power and current discharge with power factor correction, demonstrating improvements in power factors and reductions in current loads on transformers and cables, facilitating the connection of new consumers.
Individual Power Factor Correction for Low Voltage Motors:
Low voltage motors that are infrequently switched should be compensated with fixed capacitors. Guidelines for selecting the appropriate capacitor value based on motor type, speed, and load level are provided, along with considerations for quick motor discharge.
Specifications and Procedures:
The document specifies the use of capacitors in motor and transformer systems to prevent overstrains and current shocks. Capacitors with 6 poles should be connected parallel to the motor winding if a switch is unavailable, with connection methods illustrated in figures.
Motor Reactive Power:
The use of a motor's reactive power depends on motor type, speed, and load level. A formula for calculating the required capacitor power is provided, with a warning against quick discharging with larger capacitors due to self-excitation risks.
Power Factor Correction for Transformers:
Transformers can be corrected using fixed capacitors. The document provides a formula for calculating transformer reactive power, noting that no-load reactive power is 1% to 3.5% of rated transformer power.
Capacitor Power Ratings:
Tables provide power ratings of capacitors in relation to motor power, speed, load, and transformer voltage. The total correction power required in distribution transformers is advised to be 4% to 5% of rated power at an average load of 70%.
Fixed Power Factor Correction Banks:
These banks are used for correcting low voltage transformers and can enhance the power of existing correction devices. They include safety features like overpressure disconnectors and discharge resistors.
Automatic Power Factor Correction Banks:
Automatic banks are used for group and central correction of reactive power in distribution centers and industrial plants, available in outputs from 17.5 kvar to 300 kvar, and can be extended with additional cubicles.
Overview: The document provides technical specifications for various types of capacitor banks used for power factor correction and harmonic filtering in electrical systems, which are modular for future expansion.
Specifications: Capacitor banks are designed with metallized polypropylene capacitors that are self-healing and equipped with overpressure disconnectors, operating at a rated voltage of 400 V, 50 Hz.
Modular Design: Types KOK711x and KOK761x are modular systems where capacitors, contacts, and fuses are integrated into individual modules, expandable by adding more modules or cabinets.
Technical Data: Systems comply with IEC publications and offer mechanical protection level IP 20, designed to handle dynamic strength up to 100 kA.
Harmonic Filtering: The KOK811x series is designed for central correction of reactive power in systems with high harmonics, capable of filtering the 5th, 7th, and 11th harmonics.
Installation and Connection: Cable connections are located at the bottom of the banks, designed for easy connection to power and signal cables.
Order Example: An example order includes type KOK7116 with a rated power of 250 kvar and a rated voltage of 400 V, 50 Hz, three-phase.
Tables and Figures: The document includes tables detailing types, power ranges, and other specifications, along with dimension sketches.
Specifications:
The document outlines specifications for the KOK8411 type correction banks used for automatic correction of reactive power by filtering higher harmonics.
Construction:
The device is a metal bank with a door for wall mounting, equipped with a ventilator for cooling.
Installation and Connection Instructions:
Correction banks are intended for installation in production plants, distribution stations, and transformer stations, with specific site requirements.
Power Factor Controller:
The reactive power controller regulates reactive power by switching capacitor stages based on the network power factor.
Technical Data:
The controller operates with a voltage supply of 400 V ± 10%, 50 Hz, and supports a range of settings for the desired cos ϕ.
Alarm and Safety:
An alarm system signals issues such as incorrect transformer connections and overcompensation, with alerts displayed on the front panel or remotely.
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Catalog excerpts

Low voltage pfc-1

Blindleistungskompensationanlagen Low Voltage Power Factor Correction Equipment

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Low voltage pfc-3

Allgemeine Angaben: General information: Power Factor Correction Banks type KOK Reactive power Individuelle Kompensation Niederspannungsmotoren Individual power factor correction for low voltage motors Power factor correction for power transformers Fixed power factor correction banks Automatische Blindstromkompensationsanlagen Automatic power factor correction banks Automatische Blindstromkompensationsanlagen mit Filterung von hohen Harmonischen 20 Automatic power factor correction banks with harmonics filters Dauerkompensationsanlagen mit Filterung von hohen Harmonischen ^ Fixed power factor...

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Low voltage pfc-4

Power Factor Correction Banks type KOK Reactive Power Quellen, Folgen und Zustandsverbesserung Sources, consequences and condition improvement Die meisten Elektrogeräte wie z.B. Asynchronmotoren, Drehstrom-Kollektormotoren, Umwandler, Drosselspulen, Induktionsöfen, Schweißgeräte, fluoreszierende Lampen u.v.a. benötigen für ihren Betrieb neben der Arbeitsenergie auch Blindstrom, was zusätzliche Kosten dafür nach sich zieht. Neben den Energieversorgungskosten belastet aber Blindstrom auch zusätzlich die Übertragungslinien und sonstige Elemente der Verbindungsstellen. Most electrical devices like...

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Low voltage pfc-5

Methods of power factor correction Bekannt sind drei grundsätzliche Kompensationsarten: There are three basic methods of correction: Individuelle Kompensation - an größere Verbraucher wird unmittelbar die entsprechende Kondensatorenleistung angeschlossen. Individual correction - direct correction of a larger consumer by a suitable power capacitor Gruppenkompensation - an eine Verbrauchergruppe wird die entsprechende Kondensatorenleistung angeschlossen. Group correction - correction of a group of consumers by a suitable number of power capacitors Zentralkompensation - aus der zentralen Stelle...

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Low voltage pfc-6

Beispiel 1 Stromverbrauch pro Monat (aus der Abrechnung) Monthly consumption of electrical energy required cos ϕ2 = 0,95 from Table 1 tg ϕ2 = 0,329 Der Typ und die Leistung der Anlage werden aus den Tabellen abgelesen. Bei Auswahl wird 20 - 30 % Reserve empfohlen, weshalb man in unserem Beispiel die Kompensationsanlage Typ KOK7116 300 kvar wählen soll. Type and power of device are chosen from the table. A reserve of 20 - 30 % is recommended when choosing the correction bank. Considering this, we need to choose KOK7116 300 kvar.

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Low voltage pfc-7

Tabelle 2: Faktor K1 (tg ϕ1 - tg ϕ2) /Table 2 : Factor K1 (tg ϕ1 - tg ϕ2) Vorhadener Leistungsfaktor cos ϕ1 Existing power factor cos ϕ1 Geforderter Leistungsfaktor cos ϕ2 Required power factor cos ϕ2 0,7 Die installierte aktive Leistung P = 100 kW mit Leistungsfaktor vor Kompensation cos ϕ1 = 0,74 soll auf cos ϕ2 = 0,95 verbessert werden. For installed active power P = 100 kW we want to improve the power factor cos ϕ1 = 0,74 to power factor cos ϕ2 = 0,95. In Tabelle 2, Schnittpunkt von cos ϕ1 = 0,74 und cos ϕ2 = 0,95 findet man den Faktor K1 = 0,58. Faktor K1 wird mit aktiver Leistung multipliziert:...

 Open the catalog to page 7
Low voltage pfc-8

Current discharge with PF correction Mit dem Einbau von Kompensationsanlagen werden Transformatoren, Kabel und sonstige Elemente der Energieausrüstung entlastet und damit Anschluss neuer Verbraucher ermöglicht. With power factor correction we reach current discharging of transformers, cables and other elements of energy plants. This allows the connection of new consumers. In Tabelle 3 findet man Faktor K2, mit dem man den Strom vor Kompensation multipliziert I1 bei cos ϕ1 auf cos ϕ2 nach Kompensation. Factor K2 from Table 3 must be multiplied with the current before correction I1 at cos ϕ1 to...

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Low voltage pfc-9

Individuelle Kompensation Individual Correction Individuelle Kompensation wird in der Regel mit Dauerkondensatoren oder -anlagen ausgeführt. Somit werden Motoren und Transformatoren kompensiert. Individual power factor correction is normally achieved with fixed capacitors or devices. It is particularly suitable for individual power factor correction of motors and transformers. Individuelle Kompensation von Niederspannungsmotoren Individual Power Factor Correction for Low Voltage Motors Niederspannungsmotoren, die selten geschaltet werden, sollen aus technischen Gründen und wegen der Kosten mit...

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Low voltage pfc-10

Tabelle 4/Table4 Motor-nennleistung Rated motor power (kW) Leistung der Kondensatoren in (kvar) in Hinsicht auf die Motorleistung, Drehzahl und Belastung Power rating of capacitor in (kvar) with respect to motor power, speed of rotation and load 3000 rev/min Vollbelastung full load Vollbelastung full load Vollbelastung full load Vollbelastung full load Vollbelastung full load Power Factor Correction for Power Transformers Ähnlich wie die Motoren werden auch die Energieumwandler häufig praktisch mit dauerhaft angeschlossenen Kondensatoren kompensiert. Like motors, power transformers can also often...

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Low voltage pfc-11

Tabelle 5/Table 5 Nennleistung Umwandler Rated power of transformer (kVA) Leistungen der Kondensatoren in (kvar) in Hinsicht auf entsprechende Spannung und Belastung Power ratings of capacitor in (kvar) with respect to primary voltage and load 5 bis 10 kV Vollbelastung full load Vollbelastung full load Vollbelastung full load Die geforderte Kompensationsgesamtleistung in Distributionsumwandlern beträgt von 4 % bis 5 % der Nennleistung, d.i. bei durchschnittlicher Belastung von 70 %. The total correction power required in distribution transformers is 4 % to 5 % of rated power at an average load...

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Low voltage pfc-12

Dieser Anstieg ist in der Regel vernachlassigbar. This increase is usually negligible. • Moglichkeit paralleler Resonanz der 5. und 7. Har- monischen bei kleiner Umwandlerbelastung. Damit es dazu nicht kommt, darf die Leistung des ange- schlossenen Kondensators nicht die Werte uber- steigen, die auf Abbildung 5 angefuhrt sind, wo die Kondensatorleistung in Prozenten der Umwandler- nennleistung angegeben ist. Als praktische Orien- tierung wird angegeben, dass beim Umwandler mit einer Leistung bis 300 kVA die Kondensatorleistung bis zu 30 % der Umwandlerleistung betragen darf. Die Umwandleranschlussart...

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.