ENTES ENT-KT-2,5-C10 Manual

ENTES Ikke kategoriseret ENT-KT-2,5-C10

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Side 1/3

ENT Series Compensation

Contactors

Long Lifespan

Compact and

Robust Design

Integrated Auxiliary

Contact Option

www.entes.eu

Why Use a Compensation Contactor?

At the moment of switching, a capacitor practically behaves like a short circuit.

The magnitude of the inrush (charging) current depends on the AC voltage level at the moment of

switching, as well as the impedance of the supply cable and power transformers.

In single capacitor applications, the peak charging current can reach up to 30 times the capacitor’s rated

current. For multi-step capacitor banks, inrush currents may exceed 180 times the rated value.

Working Princible

The ENT Series Capacitor Contactors are specially designed to

meet capacitor application requirements. The contactors are

equipped with three early-make auxiliary contact blocks and six

series-connected resistors—two fast discharge damping resistors

per phase. This design limits the inrush current to remain within

the contactor’s making capacity. The main contacts are designed

to carry the normal rated capacitor current, and after closing,

eectively short-circuit the resistors.

This design enables safe and reliable switching of capacitor loads with high eciency.

Product Series

• The contactors are three-phase, rated for 415V AC, 50/60 Hz, with capacities ranging

from 2.5 kVAr to 100 kVAr.

• They comply with IEC 60947-4-1 and IS/IEC 60947-4-1 standards for AC-6B utilization category.

Benets:

• Compliant with IS 13947-4-1 Standard for AC-6B Utilization Category

• Reduces costly spare part expenses.

• Ensures long electrical lifetime.

• Provides low power loss in the ‘ON’ position, contributing to energy savings.

• Oers high safety.

• Eliminates the risk of dangerous voltage.

• Enables parallel switching of capacitors without requiring power derating.

• Increases operational eciency with less maintenance and downtime.

This excessive inrush current may pass through

the contactor due to the contribution from both

the supply network and the previously connected

capacitors. Such current levels can be sucient to

cause welding of the main contacts in standard

contactors.

• To limit current uctuations, add a series

damping resistor for fast discharge.

• Make sure to use a specially designed capacitor

contactor.

Max Capacitor

Charge Current

Capacitor

Time (t)

Max Current : >180 ln

Frequency: 3 to 15 kHz

Capacitor

Current

Nominal Current

Reactive

Power

Control Relay

Compensation Contactor

Compensation

Contactor

Discharge Unit Discharge Unit

Capacitors

Produkt Specifikationer

Mærke:	ENTES
Kategori:	Ikke kategoriseret
Model:	ENT-KT-2,5-C10

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