Anti-Harmonic Intelligent Capacitor Module Device

DNMK Function Features:

The DNMK anti-harmonic intelligent capacitor compensation module is a new-generation of anti-harmonic reactive power compensation device designed for 0.4 KV, 50Hz low-voltage power distribution systems. It is engineered to enhance energy efficiency, reduce line losses, improve power factor, and enhance power quality. The unit consists of an intelligent measurement and control unit, a line protection unit, and either a single (Δ-type) or a single (Y-type) low-voltage power capacitor along with a reactor. It replaces conventional automatic reactive power compensation devices, which are typically assembled from discrete components such as fuses, composite switches or mechanical contactors, thermal relays, low-voltage power capacitors, and indicator lights, all connected by wires inside and on the surface of a cabinet. It overcomes the bulky and cumbersome design of traditional reactive power compensation devices, enabling this new generation of low-voltage reactive power compensation equipment to offer superior compensation performance, a more compact size, lower power consumption, lower cost, greater cost savings, greater flexibility in use, easier maintenance, a longer service life, and higher reliability. These features meet the higher demands of modern power grids for reactive power compensation.

Main Features:

1. Zero crossing switching

Zero crossing voltage input, zero crossing current cut-of, small inrush current,no arc pulling, and no harmonic injection greatly improve the voltage and current withstand of the equipment, reducing 80% of energy consumption in conventional capacitor cabinets.

2. Temperature protection

Equipped with a builtin temperature sensor, it can achieve over temperature protection in the event of capacitor overheating caused by overvoltage, overharmonics, large leakage current, and high ambient temperature. This means that the capacitor will automatically cut of and shut down after exceeding the set temperature, achieving the purpose of protecting the equipment.

3. Over current protection

When the voltage of the power grid is too high and the harmonics are too large,it can cause capacitor overload operation. When the current of the capacitor exceeds the set value, the capacitor will automatically exit operation to avoid the danger of explosion caused by long term overload operation and achieve the purpose of protecting the equipment.

4. Voltage and current harmonic protection

When the harmonic of the power grid reaches the set value,the unused capacitor banks will no longer be put into operation, and all the capacitor banks that have been put into operation will be shut down to prevent equipment damage caused by excessive harmonics.

5. Phase compensation

Implement single-phase separate compensation to solve the imbalance of three phase loads Compensate separately for any phase with a large reactive power deficit to achieve the optimal compensation effect.

6. Lack of phase protection

When any one of the three phases A, B, and C in the power grid loses phase, the unused capacitor banks will no longer be put into operation, and all the capacitor banks that have been put into operation will be shut down to achieve the purpose of protecting the equipment.

7. Over voltage and under voltage protection

When the voltage of the power grid is higher than the set value, the corresponding intelligent capacitor automatically exits operation, avoiding the danger of explosion caused by long term overvoltage operation of the capacitor and achieving the purpose of protecting the equipment. When the voltage of the power grid is lower than the set value, the corresponding smart capacitor automatically exits operation to achieve the purpose of protecting the equipment.

8. High reliability

Adopting a decentralized control mode,it completely solves the problem of frequent damage to traditional contactles relays, contactors, and electromechanical composite switches.

9. Alarm event recording and switching statistics query function

Store alarm protection data for power on, overcurrent, overtemperature, and harmonics, as well as records of relay switching times.

10. Modular architecture

The product is standardized and modular, with two types of modules single circuit and double circuit It can be installed vertically or horizontally to meet the requirements of different cabinet structures. When installing the cabinet, the building block stacking method is used, and when the capacitor is damaged, it only needs to be easily and quickly replaced individually

11. Easy expansion

The product as a small size and simple wiring As the power load of the electricity user increases, the number of capacitors can be increased at any time.which changes the limitations of the conventional mode due to complex wiring and rigidity. It meets the needs of enterprise development and can be invested in stages

12. Maintainable

Equipped with self diagnostic function, it can reflect electronic switch,capacitor, air switch, intelligent module, network communication and other faults on the LCD screen, which is conducive to on- site fault finding When the capacitor is damaged,it can be easily and quickly replaced as a single unit, achieving maintenance free operation.

13. Simple wiring

The installation of multiple capacitor group cabinets reduces production hours by more than 60% compared to traditional modes while reducing 80% of connecting lines and nodes. The cabinet is simple and can be quickly assembled on site, which not only reduces production but also greatly improves the production efficiency of the complete set factory.

14. Significant effect

Equipped with self diagnostic function,it can reflect electronic switch,capacitor, air switch,intelligent module, network communication and other faults on the LCD screen, which is conducive to on-site fault finding When the capacitor is damaged,it can be easily and quickly replaced as a single unit, achieving maintenance free operation.

Technical Specifications:

◆ Operating Conditions

Altitude: ≤2000 meters

Ambient Temperature: -20°C to +55°C

Relative Humidity: 20% to 90% (at 40°C)

Atmospheric Pressure: 79.5–106.0 kPa

Operating Environment:

No flammable or explosive media around; no gases that can damage insulation or corroding metals; no conductive dust; the installation site is not prone to severe vibration; no exposure to rain or snow.

◆ Power Supply Conditions

Operating Voltage: AC 220 V or AC 380 V

Permissible Deviation: ±20%

Voltage Waveform: Sine wave, total harmonic distortion ≤5%

Working frequency: 50 Hz

Power consumption: <0.5 W (when capacitors are disconnected), <1 W (when capacitors are connected)

◆ Reactive Power Compensation Parameters

Reactive power compensation error: ≤75% of the minimum capacitor capacity

Interval between capacitor switching: >10 s

Compensation capacity: Single-circuit module ≤40 kvar; Dual-circuit module ≤100 kvar

Response time: <100 ms

◆ Reliability Parameters

Control Accuracy: 100%

Capacitor Capacitance Decay Rate During Operation: ≤1%/year;

Capacitor Capacitance Decay Rate During Switching: ≤0.1% per 10,000 times;

Annual Failure Rate: 0.1%

◆ Compliance Standards

GB/T15576-2020

Selection table:

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