Release date: 2017-11-29 Source: LED Network Share:

Have you ever experienced sudden power cuts while using an LED full-color display? This can be frustrating and even dangerous if it happens frequently. In this article, we’ll explore the common causes behind the frequent tripping of leakage protectors and provide practical solutions to help you avoid these issues.

1. Improper Layout of the Leakage Protector

The placement of the leakage protector plays a crucial role in its performance. If the installation is not done correctly, it may lead to unnecessary tripping. For example, incorrect wiring, damaged circuit breakers, or electrical devices that bypass the switch box can all cause misoperation of the leakage protector. Additionally, if the protector is not properly sized according to the actual load, the main leakage protector might trip more often than necessary.

To address this, it's essential to install the main leakage protector on the incoming power line as a primary defense against electrical fires and short circuits. Its rated leakage current should be set between 200–500 mA, with an operation time of 0.2–0.3 seconds. This helps reduce the impact of voltage surges and electromagnetic interference, improving selectivity and reliability. At the same time, secondary and tertiary leakage protection should be implemented within each area to minimize the risk of tripping at the main level.

2. Lack of Secondary or Tertiary Leakage Protection

If the final leakage protector in the switch box is missing, damaged, or improperly selected, it can result in the upstream protector tripping frequently. LED displays often have many metal conductors and connectors, which increase the chance of insulation failure. Adding sockets without proper protection can also contribute to leakage issues.

Implementing a clear hierarchy of leakage protection—starting from the main panel down to individual devices—can significantly reduce the frequency of tripping. Each level must be carefully designed and maintained to ensure effective protection across the entire system.

3. Limitations of the Leakage Protector Itself

Leakage protectors, whether electromagnetic or electronic, rely on magnetic induction to detect leakage currents. However, in three-phase systems, especially those used for LED displays, the load is rarely perfectly balanced. This imbalance can induce stray voltages in the magnetic ring, leading to false trips under high current or over-voltage conditions.

Moreover, there is an "action uncertainty zone" between the rated leakage current and the actual value. Fluctuations within this range can cause the protector to trip unpredictably. Choosing the right model and setting it correctly is key to minimizing such issues.

4. Incorrect Selection of the Leakage Protector

Selecting a protector with a rated leakage current higher than 30 mA or one that is oversized compared to the equipment’s needs can reduce sensitivity and lead to improper tripping. Similarly, using a delayed-type protector may prevent the correct device from responding quickly enough during a fault, causing the upstream protector to act instead.

When powering up an LED display, the initial inrush current can be quite high, potentially triggering the protector. To avoid this, it’s best to power up the system in stages. Also, consider using electromagnetic protectors that are less sensitive to surges, or electronic ones with a rating 1.5–2 times the nominal current, but only if they are used as the final protection stage with a leakage current of no more than 30 mA.

In conclusion, frequent tripping of leakage protectors is usually caused by a combination of technical and operational factors. Proper configuration, regular maintenance, and correct selection of protective devices are essential. By implementing a layered protection strategy and ensuring good electrical practices, you can greatly reduce tripping incidents and ensure the safe and stable operation of your LED full-color display.

Label: How to Solve the Frequent Tripping of LED Full Color Display?

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