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LPAC\LPFC Series of low-voltage reactive power automatic compensation equipment

Overview

MECC PHAYSE's LPAC/LPFC has reasonable design, advanced technology, are widely used in industrial and mining enterprises, workshops and shopping malls, hotels, residential communities and other distributed power system. It serves as centralized compensation for distribution network to reduce power losses, improve the Power Factor, increase power supply capacity and improve the quality of power supply in distribution system.

Features

Configure intelligent reactive compensation controller, switching mode could be loop or code switching;

AC input are equipped with fused knife switches served as input separation and short circuit protection;

Input equipped with current transformer and arrester, which can display equipment operating current and absorb over-voltage;

Equipped with SAMWHA Capacitor or other imported brands, or domestic-made high-quality full-film dielectric Self-healing power capacitors, which have advantage such as high reliability, long lifetime, low power loss, low temperature rise.

Given the current status of industrial power grid, in each of capacitors' branches, a reactance rate of 6%'s reactor is installed to contain 5th order or higher order harmonics, at the same time limiting the inrush current;

LPAC stand for AC contactor as switching equipment, where if no reactor is cascaded in capacitor branch, specialized AC contactors are needed, while cascaded case, a high quality general-purpose AC contactor is enough;

Dynamic composite switch is preferred in LPFC, dynamic composite switch contains anti-parallel thyristor switches and a maintain relay. It has the advantages of low power loss and suppressing current surge at the same time. Thyristor modules alone has the disadvantage of forward voltage drop when conducting, which could lead to huge power loss when current is big. So Thyrisor modules must have adequate cooling measures, and it also will introduce harmonics resulted by its voltage threshold for conducting. Obviously, dynamic composite switch is much better than AC contactor or Thyristor module;

But, LPFC might also use Thyristor module at customer's demand, then fan is needed in the cabinet, and higher rated voltage level of capacitors are needed to overcome the Thyristor module's harmonic problem;

LPFC can not only compensate three-phase simultaneously, but can also compensate each phase to improve the unbalanced voltage power supply system.

Condition of Use

Rated Voltage: 0.23kv, 0.4kv, 0.69kv

Temperature: -20℃～+40℃

Altitude: Less than 1000m (above1000m should adopt plateau-type components)

Humidity : ≤95% (at 25℃)

No explosive or flammable medium surrounding; no corrosive gas to damage the insulation and the metal; no conductive dust; No severe vibration and shock at the installation site.

Power supply meets national standards and no too strong harmonics current in power supply.

Implementation and reference standard

IEC 60831-1-am1 ed2.0

GB/T 12747.1-2004

GB 50227-2008

JB/T 7113-1993

Main technical performance

Can operate continuously under 110% of rated voltage, but no bigger.

Can operate continuously under 130% of rated current, provided with rated frequency and voltage.

Rated current can be computed by the capacitor's rated volume and voltage.

Degree of Protection: Indoor (IP2x to IP4x); outdoor (up to IP41)

Withstand Voltage: Voltage of 2500V, 50Hz against earth for 1 minute, with no breakdown and no flashover.

Insulation: 500V mega-Ohmmeter (100 MΩ range) check the main circuit insulation resistance of the relative should not be less than 1 MΩ, 0.5MΩ if the site is wet.

Noise:Less than 45dB.

Keywords: LPAC LPFC Low-voltage reactive power automatic compensation complex switching thyristor contactor phase-compensation

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