JL-ZMJ Smart Power Factor Correction Capacitor Unit-Jiangsu Laibao Electric Power Co., Ltd.

JL-ZMJ Smart Power Factor Correction Capacitor Unit

Product Overview

The JL-ZMJ series intelligent reactive power compensation capacitor is a standalone, integrated compensation unit comprising an intelligent measurement, control, and protection unit; a zero-inrush switching module; and either two (Delta-connected) or one (Wye-connected) low-voltage self-healing power capacitors. This device serves as a replacement for traditional automatic reactive power compensation assemblies composed of multiple discrete components, such as intelligent reactive power controllers, fuses (or miniature circuit breakers), thyristor hybrid switches (or contactors), thermal relays, indicator lights, and low-voltage power capacitors.

Performance Features

①　Modular Structure: These intelligent capacitors are created by technologically innovating standard automatic reactive power compensation circuits—whether single-channel/dual-channel common compensation or three-phase split-phase compensation—into compact modules. They feature a small footprint, simple on-site wiring, and easy maintenance; system capacity can be expanded simply by adding more modules.

②　Thyristor Switching Unit: The switching module consists of a thyristor, a magnetic latching relay, a zero-crossing trigger circuit, and a thyristor protection circuit. It achieves "zero-crossing switching" for the capacitors, ensuring no inrush current surges or operational overvoltage during the process. The module offers rapid response and supports frequent operation, with a reliable service life exceeding 300,000 switching cycles.

③　High-Quality Capacitors: High-quality self-healing low-voltage compensation capacitors are used. Each capacitor features a built-in temperature sensor to monitor internal heat generation and provide over-temperature protection.

Key Technical Parameters

Ambient temperature	-45～65℃
Relative humidity	20‑90% at 40℃
Altitude	≤2000 m
Operating voltage	±20% of the power‑supply rated voltage
Power consumption	＜0.5 W (capacitor disconnected)

Operating Environment

Scope of application	This product is applicable to 380‑V low‑voltage distribution networks and supports indoor as well as outdoor installation.
Harmonic distortion rate	THDu＜5%；THDi＜8%
Altitude	≤2000 m
Ambient temperature	-25℃ ~ +40℃
Relative humidity	20%‑90% (at 40°C)
Atmospheric pressure	79.5‑106.0 kPa
Environmental conditions	The ambient medium shall contain no explosive hazards, insulation‑damaging or metal‑corrosive gas and conductive dust. The mounting place shall avoid heavy vibration, rain and snow. The installation tilt angle shall not exceed 5%.