1. Catalogs
  2. Iskra d.d.
  3. Power Factor Correction Banks
video corpo

Power Factor Correction Banks

Power Factor Correction Banks
1 / 30 PagesView full catalog

Power Factor Correction Banks

Product catalog summary
General Overview: The document focuses on low voltage power factor correction equipment, specifically Power Factor Correction Banks type KOK. It emphasizes the importance of reactive power compensation for electrical devices like motors and transformers to reduce costs and alleviate stress on transmission lines.
Reactive Power and Compensation: Reactive power is essential for many electrical devices but adds costs and burdens the power network. Compensation is achieved by installing capacitors near inductive loads. The document details methods for determining the necessary power for correction devices through technical and economic studies.
Methods of Power Factor Correction: Three primary methods are discussed: individual correction for larger consumers, group correction for a group of consumers, and central correction with manual or automatic capacitor switching. Formulas and examples are provided for calculating the required corrective power.
Examples and Calculations: Detailed examples illustrate calculating the required capacitor rating and current discharge with power factor correction. Tables for determining factors like K1 and K2 are included, which are crucial for improving power factors.
Individual Power Factor Correction for Low Voltage Motors: The document advises using fixed capacitors for low voltage motors that are rarely switched. It highlights the importance of special switches to avoid overvoltages and current surges and provides guidelines for selecting appropriate capacitor values based on motor type, speed, and load level.
Specifications and Procedures: Capacitors are used in motor and transformer systems to prevent overstrains and current shocks. A switch or a 6-pole capacitor connected parallel to the motor winding is necessary, with connection methods illustrated in figures.
Reactive Power and Capacitor Selection: Capacitor selection is influenced by motor type, speed, and load level. The formula for calculating required capacitor power is provided, and quick discharging with larger capacitors can lead to self-excitation.
Power Factor Correction for Motors and Transformers: Table 4 provides orientational values for capacitor power ratings. For transformers, the reactive power consists of no-load power and power on short-circuit reactance, with total correction power required being 4% to 5% of rated power at an average load of 70%.
Fixed and Automatic Power Factor Correction Banks: Fixed banks are used for low voltage transformers, while automatic banks are for group and central correction in distribution centers and industrial plants. They range from 17.5 kvar to 300 kvar and include safety features like overpressure disconnectors and discharge resistors.
Technical Data: Specifications include rated power, voltage, capacity tolerance, overload capacity, temperature range, dielectric losses, and compliance with standards such as IEC 60831-1, 60831-2, and EN 60831/1-2.
Construction and Features: Capacitor banks are modular, allowing for expansion, and include components like capacitors, fuses, and chokes for harmonic filtering. They are equipped with reactive power regulators and can filter specific harmonics.
Installation and Connection: Designed for wall mounting, with cable connections typically at the bottom. The systems are easily connected to existing networks.
Applications: Suitable for industrial settings requiring reactive power correction and harmonic filtering, especially in environments with high harmonic content.
Customization and Expansion: Systems can be customized based on customer requirements, with modular designs facilitating future expansion.
Specifications for KOK8411 Type Correction Banks: Used for automatic correction of reactive power by filtering higher harmonics, with a standard resonant frequency of 189 Hz. Power spectrum ranges from 20 kvar to 60 kvar, operating at 400 V three-phase and 50 Hz.
Construction: Metal bank designed for wall mounting, equipped with a cooling fan, capacitors, and a fuse for filtering higher harmonics.
Installation and Connection Instructions: Intended for dry, ventilated sites free from dust and corrosive atmospheres. Regular maintenance checks are recommended.
Power Factor Controller: Available in PFC 6 and PFC 12 models, regulating power factor by switching capacitor stages. Features a microprocessor with a digital display for monitoring parameters.
Alarm and Safety: An alarm system signals issues like incorrect transformer connections and overcompensation, with alarms displayed on the front panel or remotely.
See more

Catalog excerpts

Power Factor Correction Banks-1

Blindleistungskompensationanlagen Low Voltage Power Factor Correction Equipment

 Open the catalog to page 1
Power Factor Correction Banks-3

Allgemeine Angaben: Seite General information: Page Blindstromkompensationsanlagen Typ KOK Power Factor Correction Banks type KOK 4 Reactive power Individuelle Kompensation Niederspannungsmotoren 9 Individual power factor correction for low voltage motors Kompensation von Energieumwandlern Power factor correction for power transformers 11 Dauerkompensationsanlagen Fixed power factor correction banks Automatische Blindstromkompensationsanlagen Automatic power factor correction banks Automatische Blindstromkompensationsanlagen mit Filterung von hohen Harmonischen 20 Automatic...

 Open the catalog to page 3
Power Factor Correction Banks-4

Blindstrom Quellen, Folgen und Zustandsverbesserung Die meisten Elektrogerate wie z.B. Asynchronmotoren, Drehstrom-Kollektormotoren, Umwandler, Drossel-spulen, Induktionsofen, SchweiBgerate, fluoreszieren-de Lampen u.v.a. benotigen fur ihren Betrieb neben der Arbeitsenergie auch Blindstrom, was zusatzliche Kosten dafur nach sich zieht. Neben den Energiever-sorgungskosten belastet aber Blindstrom auch zusatz-lich die Ubertragungslinien und sonstige Elemente der Verbindungsstellen. Dieser Zustand kann mit einer Kompensation von Blindstrom ausgebessert werden, so dass Induktionsver-brauchern Kondensatoren...

 Open the catalog to page 4
Power Factor Correction Banks-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...

 Open the catalog to page 5
Power Factor Correction Banks-6

Beispiel 1 Stromverbrauch pro Monat (aus der Abrechnung) Av = 50.000 kWh An= 40.000 kWh Wv = 45.000 kWh Wn = 43.000 kWh T = 250 geforderter cos 9 = 0.95 Av + An Qc = —t— ' (tg 9i - tg 92) = 50.000 + 40.000 Qc =-250-■ (0,977 - 0,329) = cos 91 = 0,71 geforderter cos 92 = 0,95 aus Tabelle 1 tg 92 = 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 wahlen soll. Example 1 Monthly consumption of electrical energy Av = 50.000 kWh An = 40.000 kWh Wv = 45.000...

 Open the catalog to page 6
Power Factor Correction Banks-7

Tabelle 2: Faktor Ki (tg 91 - tg 92) /Table 2: Factor Ki (tg 91 - tg 92) Beispiel 2 Die installierte aktive Leistung P = 100 kW mit Leis-tungsfaktor vor Kompensation cos 91 = 0,74 soll auf cos 92 = 0,95 verbessert werden. In Tabelle 2, Schnittpunkt von cos 91 = 0,74 und cos 92 = 0,95 findet man den Faktor K1 = 0,58. Faktor K1 wird mit aktiver Leistung multipliziert: Qc = P ■ K1 = 100 ■ 0,58 = 58 kvar Example 2 For installed active power P = 100 kW we want to improve the power factor cos 91 = 0,74 to power factor cos 92 = 0,95. We should find the point of intersection between existing cos 91 =...

 Open the catalog to page 7
Power Factor Correction Banks-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...

 Open the catalog to page 8
Power Factor Correction Banks-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...

 Open the catalog to page 9
Power Factor Correction Banks-10

Ahnlich wie die Motoren werden auch die Energieum-wandler haufig praktisch mit dauerhaft angeschlosse-nen Kondensatoren kompensiert. Die reaktive Umwandlerleistung besteht aus der Leistung im Leerlauf Q0 und der Leistung an der Kurzschlussreaktanz nach der Gleichung: Like motors, power transformers can also often be practically corrected by fixed connected capacitors. Transformer reactive power consists of no load power Q0 and of power on the short-circuit reactance according to the following formula: Uk S S = Scheinleistung Sn = Nennscheinleistung Uk = relative Kurzschlussspannung sind Die...

 Open the catalog to page 10
Power Factor Correction Banks-11

Die geforderte Kompensationsgesamtleistung in Distri-butionsumwandlern betragt von 4 % bis 5 % der Nenn-leistung, d.i. bei durchschnittlicher Belastung von 70 %. Nur selten lohnt es sich, eine unmittelbare Kompensa-tion nur fur den eigenen Umwandlerverbrauch vorzu-nehmen. In einem solchen Fall ist der Kondensator fix an einen sekundaren Umwandler angeschlossen. Die Kondensatorleistung wird so gewahlt, dass sie den voll belasteten Umwandler kompensiert. Als Richtwerte werden Werte benutzt, die in Tabelle 5 angegeben sind. Haufig wird der Fixumwandler auch so gewahlt, dass auch das Netz und kleine...

 Open the catalog to page 11
Power Factor Correction Banks-12

Dieser Anstieg ist in der Regel vernachlassigbar. • 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 ist auf Abbildung 3 darge-stellt....

 Open the catalog to page 12

All Iskra d.d. catalogs and technical brochures

  1. DZ9 Catalogue

    2  Pages

  2. eMis

    27  Pages

  3. Bistable switch

    26  Pages

  4. ECU

    2  Pages

  5. NEO 3000

    37  Pages

  6. FPC 200

    4  Pages

  7. NFIF

    4  Pages

  8. NFIB

    4  Pages

  9. FI, NFI

    2  Pages

  10. Product line

    20  Pages

  11. MCE940 SCADA

    4  Pages

  12. Energy Sector

    52  Pages

  13. Energy meters

    44  Pages

  14. Low voltage pfc

    30  Pages

*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.