Low-Voltage Anti-harmonicIntelligent Power Capacitor

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The KD‑ZLK harmonic‑suppression intelligent power capacitor is equipped with a custom segmented LCD display that provides real-time readings of three-phase bus voltage, three-phase bus current, three-phase power factor, frequency, the number of capacitor banks and their switching status, active power, reactive power, total harmonic distortion of voltage, and capacitor temperature.

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Low-voltage component

Hotline:

400-0571-505

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Detailed introduction

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Product Overview

The KD‑ZLK harmonic‑suppression intelligent power capacitor is designed for 0.4 kV, 50 Hz low‑voltage distribution reactive power compensation systems. It delivers high efficiency and energy savings, reduces line losses, improves the power factor, and enhances power quality, representing our company’s latest generation of harmonic‑mitigating reactive power compensation equipment. The device comprises an intelligent measurement and control unit, a composite switching circuit, a line protection module, reactors, and Δ‑ or Y‑connected low‑voltage power capacitors. It replaces conventional automatic reactive power compensation systems that rely on discrete components—such as fuses, composite switches or mechanical contactors, thermal relays, low‑voltage power capacitors, and indicator lights—wired together inside and on the surface of switchgear cabinets. By eliminating the bulky, unwieldy design of traditional units, this new generation of low‑voltage reactive power compensation equipment offers superior compensation performance, a more compact footprint, lower power consumption, reduced cost, greater operational flexibility, easier maintenance, extended service life, and enhanced reliability, thereby meeting the increasingly stringent requirements of modern power grids for reactive power compensation.

The KD‑ZLK harmonic‑suppression intelligent power capacitor features a custom segmented LCD display that provides real-time readings of three-phase bus voltage, three-phase bus current, three-phase power factor, frequency, the number of capacitor banks and their switching status, active power, reactive power, total harmonic distortion of voltage, and capacitor temperature.

The KD‑ZLK harmonic‑suppression intelligent power capacitor employs an internal composite switching circuit to automatically identify the optimal switching-in (or switching-out) point, enabling arc‑free make-and-break operations. It ensures zero‑crossing switching, eliminates inrush currents, prevents contact welding, features ultra‑low power consumption, and suppresses harmonics. Additionally, it provides protection against electromagnetic interference, lightning strikes, phase loss, and no‑load tripping.

Product model

Product Features

●Zero-crossing switching
It achieves zero‑voltage switching for connection and zero‑current switching for disconnection, resulting in minimal switching inrush currents, ultra‑low power consumption, no arc‑over, and no harmonic injection. This significantly enhances the equipment’s ability to withstand voltage and current surges while reducing energy losses by 80% compared with conventional capacitor banks.
● Temperature Protection
The anti-harmonic intelligent power capacitor is equipped with a built-in temperature sensor. It provides over-temperature protection under conditions that cause capacitor heating—such as overvoltage, excessive harmonic distortion, excessive leakage current, or excessively high ambient temperatures—by automatically disconnecting the capacitor and deactivating it once the preset temperature threshold is exceeded, thereby safeguarding the equipment.
● Phase-loss protection
When phases A, B, and C are missing in the power grid, the corresponding uninterruptible intelligent integrated harmonic‑suppression capacitor compensation devices that have not yet been commissioned will remain de‑energized, while those already in service will be taken out of operation, thereby protecting the equipment.
● Overvoltage and undervoltage protection
When the grid voltage exceeds the set threshold, the corresponding smart capacitor automatically disconnects from operation, preventing the risk of explosion caused by prolonged overvoltage and thereby protecting the equipment. When the grid voltage falls below the set threshold, the corresponding smart capacitor likewise automatically disconnects, serving to safeguard the equipment.
● Voltage and current harmonic protection
When grid harmonic levels reach the set threshold, any uninterruptedly connected smart capacitors are no longer engaged, and those already in service are taken out of operation, thereby preventing excessive harmonics from causing equipment damage.

Main Technical Parameters

Rated voltage	380V, 690V ±20%
Rated frequency	50 Hz or 60 Hz
Wiring mode	Three-phase three-wire
Reactance rate	7%, 14%
Electrolyte	Imported polypropylene film
Polypropylene film thickness	10 μm – customizable to 12 μm
Tolerance deviation	±3%
Insulating medium	Epoxy resin or nitrogen
Overcurrent capacity	2In
Discharge capacity	Discharge the 50S to below 50 V.
Operating ambient temperature	-40℃~+50℃
Altitude	2,000 meters; custom options available for distances over 2,000 meters.
Service life	Greater than 100,000 hours
Maximum capacity of single set	50kvar
Executive standards	GB/T15576

Wiring Method for Harmonic-Resistant Smart Power Capacitors

Product dimensions

Smart capacitor model	Rated capacity/kvar	LxWxH/mm
KD-ZLK0.48-5T7	5	500x175x405
KD-ZLK0.48-10T7	10	500x175x405
KD-ZLK0.48-15T7	15	500x175x405
KD-ZLK0.48-20T7	20	500x175x405
KD-ZLK0.48-25T7	25	500x175x405
KD-ZLK0.48-30T7	30	500x175x405
KD-ZLK0.48-40T7	40	500x175x460

Smart capacitor model	Rated capacity 1/kvar	LxWxH/mm
KD-ZLK0.28-5F7	5	500x175x405
KD-ZLK0.28-10F7	10	500x175x405
KD-ZLK0.28-15F7	15	500x175x405
KD-ZLK0.28-20F7	20	500x175x405

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Low-Voltage Anti-harmonicIntelligent Power Capacitor

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