When the street light is used, the current is large and it takes an hour or two for the leakage fuse to trip. The reasons may be as follows:
1. the leakage fuse is larger: the leakage fuse is a kind of use. A device used to protect a circuit. When the current in the circuit exceeds the rated current of the leakage breaker, the leakage breaker automatically trips and breaks the circuit. If the current rating of the leakage fuse is higher, the current in the circuit must reach a higher value to cause the leakage fuse to trip.
2. There is a short-term overload current in the street light circuit: When the street light starts, due to the low resistance of the bulb, a short-term overload current appears in the circuit. . Indeed, the resistance of the bulb is low when it is cold and the current is high at start-up.As the temperature of the bulb increases, the resistance gradually increases and the current gradually decreases. If the current rating of the leakage fuse is large, this brief overload current may not be enough to cause the leakage fuse to trip.
3. The operating characteristics of leakage protection: The operating characteristics of leakage protection mean that the leakage protection will not trip until the current exceeds the rated current for a certain period of time. Generally speaking, the longer the leakage protection action time, the higher the rated current. If the leakage fuse operates for a long time, the current in the circuit must continue for some time before the leakage fuse trips.
4. There are other loads in the street lighting circuit: in addition to flash bulbspublic age, there may be other loads connected to the street lighting circuit, such as motors, heaters, etc. The starting current of these loads is relatively large, which may cause the total current in the circuit to exceed the current rating of the leakage protection. If the current rating of the leakage fuse is higher, the starting current of these loads may not be sufficient to trip the leakage fuse.
To summarize, when the street light is used, the current is large, and the reason why it takes one or two hours for the leakage breaker to trip may be due to the rated current of the leakage breaker . is relatively large and there is a short-term overload current in the street light circuit, which causes the leakage circuit breaker to trip. The operating characteristics are longer or there are other loads in the lighting circuitpublic air conditioning. In order to ensure the safe operation of the circuit, it is recommended to regularly check whether the rated current of the leakage protection meets the actual needs of the street lighting circuit, and select the appropriate leakage protection according to the actual situation. .
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