Why did the time control trip when the street lamp was removed?

The quickest method is the segmented disconnect elimination method!

The specific operation method is to disconnect the 10 street lamp lines from the middle, the first 5 lamps are wired and tested for power transmission, if the power can be transmitted normally, the fault is in the middle of the last 5 lights, and then the rear 5 lamps are disconnected once from the 3rd lamp, and then the 3 lamps are connected to the front 5 lamps, and the power is sent at the close, if it can be used normally, the fault is in the last 2 lamp lines, and then the last 2 lamp lines are slowly tested with a megohmmeter section by section until the fault point is found to be repaired.

2) The second emergency maintenance method is the zero-fire line adjustment method.

When the street lamp line leakage trips, and the emergency electricity, the road is not soaked in water, the zero line can be put at the lower port wiring of the street lamp leakage, and the position of the live wire can be replaced from the new compacted wiring screw after closing the power transmission can restore the normal power supply.

Closing remarks: The second kind of zero fire line adjustment emergency method, after eliminating the leakage fault should be restored to normal power supply as soon as possible, this method can only be used for emergency purposes, is a temporary emergency electricity can be used, remember to wait for the daytime fault repair should be restored to the normal position of zero fire.

That's the line leakage, which is basically critical. Check the insulation resistance of the line. The leakage current is a leakage protector in a critical state, sometimes jumping and sometimes not jumping.

The related reasons are none other than the time-controlled circuits and street light circuits that are subject to leakage insurance.

Leakage tripping, in addition to large current overload, short circuit, the most is the trip caused by the grounding fault, because the fault current is very small, not easy to detect, often very hidden.

Usually the control loop is indoors, and the probability of ground failure is low. The street lamp circuit is in the open air, exposed to the wind and sun, the environment is harsh, and the grounding failure rate is very high. For example, water ingress into the junction box, damage to the wire insulation skin touching the ground, damage to the insulation and bandaging of the line joint, etc.

The method of detecting grounding faults is mainly the line segmentation elimination method, and the tool is to shake the table.

Since it is a leak trip. There should be leakage. Or the wiring is wrong, so that the leaked live wire neutral line current is not equal.

Check for wiring or leakage.

If it is not a problem of insulation and leakage, it is that there are too many light poles, and the inductive capacitance is too large when it starts instantaneously, which causes the leakage protector to act, and you can delay several street lights for more than 1 second

There is a situation where the neutral line of the street lamp time controller touches the line.

Put the fire zero line of the time controller separately, without going through the touch protector.

If the above measures are used, it will trip, that is, there is a short-circuit in the street lamp line.

In view of your problem, if the street lamp leaks and trips, it basically has nothing to do with the space-time switch. But there is a direct relationship with the contactor. Because these two things are in action at the same time.

Immediately, the circuit will be tripped. Therefore, the contactors only need to move together. Loops are created right away.

Hope it helps, it's just a personal opinion.

It is possible that the AC contactor is broken, and the arc is pulled when it is cut off, causing it to trip.

At the beginning of the time control, it does not trip in the manual state, and it trips in the automatic working state, so it is more difficult to judge the cause of the failure.

Because the load is the same, it is impossible to trip manually without tripping, and automatically trip.

It is advisable to replace the switch, check the line insulation on the lower load side, and then determine if it is also tripped.