ANTI-Harmonic Capacitors

ANTI-Harmonic Capacitors Application

In recent years, with the rapid development of technology, a large number of rectification, frequency conversion, and large-scale power electronic devices have been employed in power systems. Consequently, the pollution from harmonics to the power grid has become increasingly severe. This has made ordinary capacitors susceptible to damage. In response to the worsening power grid environment, our company has developed harmonic-resistant capacitors. These capacitors possess a higher ability to withstand currents and are connected in series with reactors to suppress harmonic current amplification and prevent resonance. Additionally, this product functions as a reactive power compensator.

The system is primarily designed for situations where harmonics of the 5th, 7th, and higher orders are generated by nonlinear devices such as frequency converters, and when the proportion of nonlinear devices to the transformer capacity is ≤50%. In such cases, a typical reactance rate of 6% or 7% is selected. The rated voltage options for harmonic-resistant capacitors are 450V and 480V, whereas the use of ordinary 450V capacitors is not recommended.

For scenarios where harmonics of the 3rd order and above are generated by high-power DC motors, rectification equipment, and other nonlinear devices, and where the proportion of nonlinear devices to the transformer capacity is ≤50%, a typical reactance rate of 13% or 14% is chosen. Capacitors with a rated voltage of 525V are selected in this case. The use of ordinary 450V capacitors is strictly prohibited.

In cases where harmonics already exist in a user's power grid and no reactors are installed within the existing reactive power compensation cabinet, harmonic-resistant capacitors can be used to replace ordinary capacitors, provided that the total distortion rate of harmonic current in the power grid is ≤30%. This replacement can prolong the lifespan of the capacitors and enhance the effectiveness of reactive power compensation.

Low Voltage Shunt Capacitor Structural Features

1.The outer casing is made of corrosion-resistant galvanized iron with sealed edges on both sides through rolling and biting.

2.The impregnating agent is non-toxic.

3.Built-in discharge resistor.

4.Capacitor components utilize high-quality, high-temperature metallized polypropylene film.

5.The current density of the components is designed to be 1/3 of that of regular capacitors, significantly enhancing current-withstanding capability.

Self-healing Low-Voltage Parallel Sub-Compensation Capacitor Main Technical Parameters

1.Rated Voltage Levels (kV): 0.45, 0.48, 0.525.

2.Rated Capacity (kvar): 15~60.

3.Capacitance Deviation (μF): 0~+3%.

4.Dissipation Factor (tanδ): ≤0.1% (at Un, 50Hz, 20℃).

5.Inter-electrode Withstand Voltage: 2.15Un for 60 seconds, without permanent breakdown or flashover.

6.Electrode-Shell Withstand Voltage: 2Un+2kV (or 3kV if below 3kV) for 10 seconds, without permanent breakdown or flashover.

7.Maximum Permissible Voltage: Can operate continuously at ≤1.1Un.

8.Maximum Permissible Current: Capacitor can operate continuously at 1.5ln; allowed to operate for 4 hours at 2ln.

9.Discharge Device: After disconnecting power for 180s, the voltage of the capacitor drops below 50V.

Split-phase And Phase-to-Phase Compensation Shunt Capacitors Specification