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LED display power supply is too large how to deal with
LED displays often experience a situation where the neutral (zero) line current exceeds the phase line currents. This phenomenon is typically not observed in balanced three-phase systems, where the three-phase currents are equal and have a 120-degree vector angle difference. In such cases, the currents cancel each other out, resulting in zero neutral current.
However, LED displays are usually powered by switching power supplies, which generate significant third harmonic currents. These third harmonic currents are considered zero-sequence currents because they are in phase across all three phases. As a result, they add up on the neutral line rather than canceling out, leading to abnormally high neutral current.
The third harmonic current from switching power supplies can range between 55% and 80% of the total current. This can cause strange behavior in the LED display, such as the neutral current being much higher than the phase currents or even close to the sum of the phase currents.
To address this issue, a dedicated zero-sequence filter (ZSFGD series) is an effective solution. Developed through years of experience in handling zero-line current problems and breaking foreign technology barriers, this device is specifically designed to tackle the high neutral current caused by LED displays. The zero-sequence filter is connected in parallel with the phase lines of the LED display. When the third harmonic current passes through the filter, it generates magnetic flux. Through detection and calculation, the filter creates an opposing magnetic flux to cancel out the harmonics, effectively reducing the neutral current.
Benefits of using a zero-line overcurrent filter include:
1. Reducing the neutral line current of the LED display by 90% or more.
2. Preventing overheating of cables, reducing energy losses, and saving 3% to 8% in electricity costs.
3. Avoiding insulation aging on the neutral wire, which could lead to electrical fires due to short circuits.
Product features of the ZSFGD zero-sequence filter include:
1. **Installation Method**: Unlike traditional neutral current blockers that require the main transformer switch to be turned off, the zero-sequence filter can be installed without interrupting the LED display operation.
2. **Compliance with National Standards**: Neutral current blockers may not meet national safety standards, as they are not allowed to be connected in series on the neutral line. The zero-sequence filter, however, complies with all relevant regulations.
3. **Personal Safety**: Neutral current blockers can carry voltage, posing an electric shock risk. The zero-sequence filter ensures the neutral line remains at zero voltage, making it safe for human contact.
4. **Display Device Safety**: If a neutral current blocker fails, the LED display may lose its neutral connection, potentially damaging components. A failed zero-sequence filter will simply prevent the display from starting, without causing damage.
5. **Short Circuit Safety**: A short circuit in a neutral current blocker can increase impedance, reducing the short-circuit current and increasing the risk of fire. In contrast, a zero-sequence filter allows the upstream circuit breaker to trip safely.
6. **Effectiveness**: Traditional blockers have a filtering rate below 60%, while the zero-sequence filter achieves a filtering rate of over 90%.
By using a zero-sequence filter, you ensure a safer, more efficient, and stable power supply for your LED display system.