Low Voltage Shunt Capacitor

As the core component of the low-voltage reactive power compensation system, the operational efficiency and stability of Low Voltage Shunt Capacitors directly affect the energy consumption and safety of the entire distribution system. Many users may think that Low Voltage Shunt Capacitors, as energy storage elements, their own losses can be disregarded in reactive power compensation. However, the actual situation is not what these users think. A thorough understanding of the composition of the losses of Low Voltage Shunt Capacitors and taking effective measures to reduce these losses is a crucial step towards achieving efficient and energy-saving compensation.

The total losses of Low Voltage Shunt Capacitors mainly consist of 3 components: dielectric loss, equivalent series resistance loss, and harmonic loss. Firstly, dielectric loss is the core component of the total loss. Its generation mechanism stems from the polarization and relaxation process of the insulating medium of the capacitor under the action of alternating electric field. The magnitude of dielectric loss is closely related to the material and processing level of the dielectric. Secondly, this type of loss, equivalent series resistance loss, is composed of the resistance of the metal plates, the resistance of the lead terminals, and the contact resistance of the internal connection points, forming a complete resistance path. When the working current flows through this resistance path, the equivalent series resistance loss will continuously consume the system energy in the form of heat. Finally, harmonic loss exists in the power grid with harmonic components. High-frequency currents will intensify the skin effect of the conductor, directly leading to a significant increase in the equivalent series resistance value, and may also cause a sharp increase in the dielectric loss value. Harmonic loss is particularly significant in the distorted waveform power grid environment and ultimately becomes the fundamental cause of abnormal heating and even early damage of the capacitors.

How to effectively reduce these three types of losses? We need to start from three aspects: selection, configuration and system governance. In terms of selection, users should prioritize choosing self-healing Low Voltage Shunt Capacitors with high-quality and low-loss metallized films as the media. These products have extremely low tangent values of loss angle, which reduces the dielectric loss at the source. In terms of system configuration, users must match the appropriate series reactor with the capacitor according to the actual harmonic conditions of the power grid. This not only can suppress the closing surge current, but more importantly, it can avoid harmonic amplification, control the harmonic current flowing through the capacitor within the safe range, and thus significantly reduce the additional losses caused by harmonics. In addition, users should ensure that the capacitor operates near the rated voltage and avoid long-term overvoltage operation, which is also an important measure to prevent abnormal increase in losses.

Geyue Electric has a profound understanding of the direct impact of capacitor losses on the overall energy efficiency goals of users. Therefore, we have integrated the concept of low loss into our product design and our system solutions from the very beginning. The Low Voltage Shunt Capacitors we produce adopt advanced metallized polypropylene films and unique internal structure designs, ensuring that they have only extremely low inherent losses. At the same time, our intelligent reactive power compensation solution integrates capacitors with precisely matched tuned reactors, forming a compensation module that can effectively resist harmonic interference. This intelligent reactive power compensation system not only improves the power factor but also achieves deeper energy savings by reducing the operating losses of the capacitors themselves. Choosing Geyue Electric means choosing a partner that is committed to providing you with the most efficient and stable reactive power compensation products. We are willing to work together with you to explore the potential of every kilowatt-hour of electricity and safeguard your green electricity usage.