Smart Capacitor

Published by Wendy Wang, Jiangsu Modern Electric Technology Co., Ltd.

The first developer of smart capacitor in China; Nantong, Jiangsu, China.


Smart capacitor integrates such advanced technologies as modern measure-control, power electronics, network communication, automation control, power capacitor and others. It changes the outdated controller technology of traditional reactive power compensation device and the switching technology that the outdated mechanical contactor or mechatronics switch is used to switch the capacitor, and also changes the bulky and heavy structure mode of the traditional reactive power compensation device, so that the new generation of low-voltage reactive power compensation equipment has better compensation effect, smaller volume, lower power consumption, lower price and cost saving, featuring more flexible in use, more convenient in maintenance, longer service life and higher reliability, which meets the higher requirements of reactive power compensation.


Smart Capacitor Composition

The smart capacitor is of modular design, which consists of high-quality capacitor, reactor, smart measurement and control module, switching switch module, circuit protection module and man-machine interaction module.


Basic Function

The intelligent capacitor can be used by a single unit or multiple units on line. It can replace the conventional automatic reactive power compensation device composed of smart control device, fuse, composite switch or mechanical contactor, thermal relay, low-voltage power capacitor, indicator light, etc.

/Reactive power compensation system composed of conventional capacitorsReactive power compensation system composed of smart capacitors
Reactive power compensation deviceConventional capacitor, fuse, compound switch or mechanical contactor, thermal relay, intelligent controllerSmart capacitor (used by a single unit or multiple units online)
Control modeAuto or manual controlAuto or Manual, realizing zero-crossing switching (auto control without a controller)
Parameter measurementMeasure voltage, current, reactive power factor, power factorMeasure voltage, current, reactive power factor, power factor, three-phase current of each capacitor, internal temperature of the capacitor
Status monitoringSwitching status, over or under compensation status, over or under voltage statusSwitching status, over or under compensation status, over or under voltage status, protection action type, self-diagnosis fault type
Protection typeCurrent swift switch-off, over-current protection, over-voltage protection, under-voltage protectionCurrent swift switch-off, over-current protection, over-voltage protection, under-voltage protection, over temperature protection of the capacitor, phase loss protection, three-phase imbalance protection
Man-machine DialogNixie tube and buttonsDisplay screen and buttons show rich information and content
Installation and useComponents: various in categories and greater in quantities and complex in structureSimple in product structure, easy to install and make wiring
System composition and extensionIntegrated product design, one-time investment. It is difficult to adjust the compensation capacity.The product is of modular design, it’s easy to expand the compensation capacity, and the staged investment can be realized.
Appearance and weightHuge size, very heavy weightCompact structure, light weight. It can be installed in the electrical cabinet directly.
Reliability analysisThere are many kinds and quantities of components. The failure of the controller will cause the failure of the whole compensation system.Smart capacitors can automatically constitute system to work, if a single smart capacitor breaks down, it will automatically exit the system, without affecting the operation of other smart capacitors, therefore, it has high system reliability.


Published by PQBlog

Electrical Engineer

2 thoughts on “Smart Capacitor

  1. Howdy, i read your blog occasionally and i own a similar one and i was just wondering if you get a lot of spam comments? If so how do you reduce it, any plugin or anything you can recommend? I get so much lately it’s driving me insane so any help is very much appreciated.


    1. Hello Shanell, Thank you for your message. Yes, we do get a lot of spam, but it is being filtered automatically. Unfortunately, it is affecting other comments and we have to manually approve the ones that are not spam.


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