Tang Xueyang

Ankerui Electric Co., Ltd. Shanghai Jiading 201801

In industrial production scenarios, AC contactors, as the core control components of motor circuits, are the "key hub" to ensure the continuous operation of equipment. However, sudden situations such as lightning strikes, short circuit reclosing, power grid faults, and startup of high-power equipment can easily cause voltage drops (commonly known as "shaking"), which can easily lead to the accidental release of contactors and trigger the shutdown of interlocking equipment. For continuous production enterprises such as chemical, cement, metallurgy, etc., even a few seconds of shutdown can cause production line interruption, material loss, equipment damage, and result in huge economic losses of hundreds of thousands or even millions, becoming a "trusted threat" that restricts the efficient production of enterprises.

The traditional way to deal with shaking electricity is often to install voltage regulators, UPS and other equipment, which is not only expensive and complex to install, but also difficult to accurately match the anti shaking electricity requirements of the contactor circuit, and cannot solve the problem of shutdown from the root.

1、 Reasons for shaking electricity

short-circuit fault

Insulation flashover

High power motor starting

lightning surge

Switching between automatic switching or fast switching devices

2、 The hazards of electric shock

Less impact on public users

Voltage sag has little impact on many users, especially those in public and civil buildings, and some may not even notice its occurrence. Due to the extremely short occurrence time, it is necessary to install a dedicated monitoring instrument (such as APM830, APView500) on the power grid, otherwise it is difficult to determine whether a voltage dip has occurred.

rightPetrochemicals and semiconductorsWaiting for industriessignificant impact

Some users and facilities that are very sensitive to voltage dips (such as semiconductor industry, electronic numerical control equipment, variable speed drive motor devices, IT industry equipment enterprises, etc.) will suffer huge losses once voltage dips occur.

causeSensitive usersofLong term shutdown

When the amplitude and duration of voltage sag exceed the tolerance of critical control equipment for sensitive loads, it will affect normal operation. Stop working or restart automatically when the voltage is restored, causing the automated production line controlled by them to stop working or even restart in disorder.

Voltage sag can cause tripping of contactors or protective circuits, leading tomotorWaiting for the main electrical equipmentstop working.

Short term interruptions can cause short-term power outages for both the system and users.

Once the production line of power users is forced to shut down due to voltage fluctuations, not only will the products being processed on the line be scrapped, but the production line will also need to be restarted, resulting in at least a few hours of production stoppage. This is no different from restarting after an unplanned power outage and restoring power supply.

giveSensitive usersbringHuge economic losses

The temporary voltage drop causes users to need a long time to clean up the site and restart the equipment, resulting in serious economic losses and harm to users every time. And it cannot guarantee safe production

Has risen to become an important power quality issue

For sensitive users, over 90% of power quality issues are caused by voltage dips, making voltage dips one of the most significant power quality problems affecting the normal and safe operation of such electrical equipment.

According to statistics, in Europe and the United States, the power sector and users pay much more attention to voltage dips than to other power quality issues. One important factor is that among the many reasons related to power quality, user complaints caused by voltage dips account for more than 80% of all complaints about power quality issues, while complaints about power quality issues caused by harmonics, switch operation overvoltage, etc. account for less than 20%.

3、 What are low-voltage sensitive equipment

4、 Governance of electric shock

Management of voltage sag:

In theory, governance on any level of equipment can improve power quality, but the cost and time spent may vary.

The cost of voltage sag treatment decreases in order of magnitude from the source of power supply treatment to the treatment of the entire production line, equipment level treatment, and then to equipment control level treatment. Therefore, in terms of governance cost and effectiveness, it is more advocated to carry out governance at the end of the equipment, and even to deeply treat and bury electrical control components inside the equipment. The closer the treatment is to the end, the lower the cost and the same treatment effect can be achieved. Therefore, the key to governance lies in solving the problem of power oscillation in sensitive equipment of low-voltage systems.

5、 Ankerui ARD-KHD-S03: The "Shake Electric Killer" of Electric Motors

Ankrui has been deeply involved in the field of industrial electrical safety and energy management for more than 20 years, accurately identifying industry pain points, and launching the ARD-KHD-S03 series anti surge device. With the dual core functions of "surge hold+surge restart", it specifically solves the equipment shutdown dilemma caused by voltage drop, and builds a "safety defense line" for continuous production for enterprises.

Shaking and holding: In the event of a momentary voltage drop, the device can continuously supply power to the contactor coil, maintaining its engaged state and avoiding false tripping caused by short-term voltage fluctuations.

Shake power restart: After the voltage is restored, the device can automatically execute batch restart logic, orderly resume equipment operation, greatly shorten power outage recovery time, and reduce manual operation.

6、 Applicable scenarios and characteristics

Whether it is a conventional AC220V/380V contactor circuit, or a frequency converter or soft starter control circuit, ARD-KHD-S03 can be flexibly adapted. Its 4-channel programmable DI/DO interface, optional MODBUS communication and event recording function make it a key node in intelligent motor management systems.

Product Features:

The combination of shaking power maintenance and shaking power restart makes wiring convenient and can effectively resist contactor release caused by voltage drop

■ Anti shaking programmable settings to meet different customer needs

4 programmable DI inputs, using built-in DC24V power supply; 4-channel programmable passive DO output

■ Optional 1 channel MODBUS-RTU communication

■ Optional recording of shaking events, switch events, contactor events, device events, power on events, temporary rise and fall events, with 16 each for easy user maintenance and management

The main body comes standard with a LCD display, and an external embedded installation display unit is also optional

External display unit supports USB program upgrade

7、 Wiring diagram of anti vibration electrical device

ARD-KHD-S03 anti vibration device

Contactor circuit oscillation and holding wiring diagram

Wiring diagram for contactor circuit shaking and holding+restart

Wiring diagram for restart of frequency conversion circuit

8、 Project Case

Case 1: * * County Xintai Chemical's Annual Production of 300000 Tons of Functional Polystyrene Project

The project is located in * * County, Hebei Province, covering an area of 85.75 acres, with an investment of 250 million yuan and a planned annual production capacity of 300000 tons. It is one of the nine demonstration projects in the county in 2021.

This project aims to equip 139 motor circuits in the low-voltage distribution room with ARD2F intelligent motor protectors and ARD-KHD-S03A anti vibration devices, including 52 anti vibration devices. After simulating the shaking test, the anti shaking device can maintain or restart the shaking, and its functions meet the expectations of the owner. Since its launch, all functions have been normal and there have been no feedback on after-sales issues.

Case 2:

Kaifeng * * Material 30000 tons/year/safety upgrade and technical renovation project for phosgene and phosgene products

The project is located in Kaifeng, Henan Province, and * * New Materials belongs to * * Group. It covers an area of 148 acres and has an annual production capacity of 50000 tons of phosgene approved by the National Office for the Prohibition of Chemical Weapons. This project is a safety upgrade and technical renovation project for phosgene products, with one of the main objectives being to achieve anti shaking electrical transformation of the straight up and variable frequency circuits. In the end, dozens of ARD-KHD-S03A units were purchased from our company. Our company participated in various stages such as early docking, drawing modification, and on-site debugging. As it was a renovation project, the on-site wiring was complex and the control process needed to be considered. As a result, the R&D personnel have been involved until nowThe on-site coordination personnel have completed the functional debugging.

Conclusion

Industrial production, continuity is king; Shaking electricity is no small matter, stopping the machine will result in losses. Choosing a suitable anti vibration device is choosing a "peace of mind guarantee" for stable production. With precise surge protection, reliable operational performance, and convenient adaptation experience, we solve the problem of industrial surge and safeguard the lifeline of continuous production for enterprises, providing efficient production, cost reduction, and efficiency improvement protection!

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