Common faults of courtyard lamps are divided into high resistance fault and low resistance fault. What is a high resistance fault? What is a low resistance fault?

High impedance fault, that is, the cable is burnt out, the resistance measured by the meter is large, or the insulation between phases or ground drops,

But there is a certain resistance value; Low-resistance fault, that is, short circuit of wire or complete short circuit grounding, current increases, and power transmission trips.

These two types of faults and their frequent occurrence pose a threat to the normal use of courtyard lamps. Next, I will explain to you the common faults and causes of courtyard lamps.

Main causes of courtyard lamp failure:

1、 The construction quality is poor, and the proportion of failures caused by the construction quality is large.

main cause:

1. The depth of cable trench is not enough, and the sand-covered brick is not built according to the standard;

2. The production and installation of the passage pipe do not meet the requirements, and the two ends are not manufactured according to the standards;

3. When laying cables, the fourth embedded pipe is not built according to the standard requirements, mainly because the embedded pipe is too thin,

With a certain degree of bending, it is difficult to wear the cable. There is a "dead bend" at the bottom of the foundation. The crimping of the wire head and the insulation package are not thick enough. After a long time of operation, there is a short circuit between phases.

2、 Poor material quality

The material quality is also very low according to the faults handled in recent years.

Main reasons: low aluminum content of wire, relatively hard wire and thin insulation layer.

3、 The quality of supporting projects is not up to standard

The optical cable for courtyard light is usually laid on the sidewalk. The construction quality of the sidewalk is poor, the ground sinks, and the cable is stressed and deformed,

Cause cable armouring. Especially in the extremely cold areas of Northeast China, the arrival of winter makes the cable and soil form a whole.

Once the ground recedes, it will be pulled at the bottom of the courtyard lamp foundation, and when there is too much rain in summer, it will burn off at the base.

4、 Unreasonable design

1. Overload operation. With the continuous development of urban construction, the courtyard lamp has also been extended. When building a new courtyard lamp, it is often close to which courtyard lamp,

The load of the yard lamp is too large, the cable is overheated, the cable nose is overheated, the insulation is reduced, and the grounding short circuit occurs;

2. In the design of the yard lamp pole, only the own situation of the lamp pole is considered, and the space of the cable head is ignored. After the cable head is wrapped,

Most of them can't close the door, sometimes the cable length is not enough, and the connector manufacturing does not meet the requirements, which is also the cause of failure.