Low Voltage Reactive Power Compensation Controller

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The KZD-111 intelligent reactive power compensation controller is a new-generation device that integrates data acquisition, reactive power compensation, and grid parameter analysis. It is suitable for monitoring and reactive power compensation control in AC low-voltage distribution systems ranging from 0.4 kV to 1.0 kV at 50 Hz. At its core, the KZD-111 intelligent reactive power compensation controller employs a high-speed digital signal processor and utilizes AC sampling. Its human–machine interface features a large 128×64 dot-matrix LCD display. The controller offers functions such as power distribution monitoring, reactive power compensation, harmonic analysis, and an adaptive frequency algorithm, with input signals adjustable within the range of 45 Hz to 55 Hz.

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Reactive Power Compensation Controller

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400-0571-505

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Detailed introduction

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Product Overview

The KZD-111 intelligent reactive power compensation controller is a next-generation device that integrates data acquisition, reactive power compensation, and grid parameter analysis. It is suitable for monitoring and reactive power compensation control in AC low-voltage distribution systems operating at 0.4 kV to 1.0 kV and 50 Hz.

The KZD-111 intelligent reactive power compensation controller is centered around a high-speed digital signal processor, employs AC sampling, and features a 128×64 dot-matrix large-screen LCD as its human–machine interface. It offers distribution network monitoring, reactive power compensation, harmonic analysis, and an adaptive frequency algorithm, with input signals adjustable within the range of 45 Hz to 55 Hz.

Product model

Main Technical Parameters

Rated voltage	230V～850V (special voltages available upon request)
Rated frequency	50 Hz, 60 Hz
Working voltage	AC 220V or 380V
Output modes	Routes 12, 18, 24, and 32 are available.
Control mode	Dynamic or static
Compensation method	Co-supplementation or mixed supplementation
Protection level	IP40
Opening size	138mm*138mm
Altitude	2,000 meters; custom options available for distances over 2,000 meters.
Service life	Greater than 3000 hours

Product Features

● Equipped with functions for overvoltage, undervoltage, phase-loss, zero-sequence current limit exceedance, harmonic current limit exceedance, and system oscillation detection and display, as well as rapid disconnection of capacitor banks.
● Flexible control parameter settings, easy to use, and data is retained even after power loss;
● Based on the power factor and reactive power, capacitors are switched in or out, with up to 32 circuits controllable.
● Flexible compensation methods, enabling full common‑mode compensation, full differential‑mode compensation, or a hybrid approach combining both.
● Capacitor switching employs a first‑in‑first‑out strategy, combined with cyclic and coded switching, to maximize capacitor service life.
● The encoding switching mode and manual operation mode can be configured.
● Capable of displaying system parameters and harmonic conditions in real time.

● Air temperature: The air temperature shall not exceed +65°C nor fall below -25°C.
● Atmospheric conditions: At 20°C, the relative humidity shall not exceed 90%; at lower temperatures, higher relative humidity is permissible.
● Altitude: not exceeding 3,000 meters.
●Environmental conditions: The surrounding medium shall be free of flammable or explosive hazards, corrosive gases, conductive dust, and the effects of rain or snow; the installation site shall be free of severe vibrations.

Product dimensions

Model number	Control method	Maximum number of controlled channels
KZD-111-12D	Dynamic (Thyristor)	12
KZD-111-18D		18
KZD-111-24D		24
KZD-111-32D		32
KZD-111-12B	Static (contactor)	12
KZD-111-18B		18
KZD-111-24B		24
KZD-111-32B		32

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