How to detect street light cable failure

August 06 02:35:10, 2021

How to detect street light cable faults First, use megohmmeter to detect This method is traditional street light cable fault detection method. The power supply radius of the street light line is generally between 0.4-0.6km, and the distance between streetlights is 30-40m. The entire line is like a trunk, and the load is relatively scattered. To detect the phase and ground insulation resistance of the cable, the load of the street lamp must be cut off first, then the middle point must be disconnected, and the phase-to-earth and ground insulation tests should be performed phase by phase with a megohmmeter, and the fault point direction should be judged by elimination. Because this method can only detect the point where the fault point is located, it cannot detect the exact position, and there are many cable break points, and it needs to be re-clamped and resumed. The workload is large, and it also adds new potential points for future maintenance work. . Therefore, this method is basically not used now.

Second, using the clamp ammeter to detect the existing capacity of the street light distribution cabinet with a corresponding capacity of circuit breakers, fuses and other safety protection measures, so the cable short circuit, leakage failure will not cause large-scale damage to the cable damage, under normal circumstances Just find the fault point of the cable and cut off the re-clamping of the cable to continue using it.

The principle of using the clamp ammeter to detect the street lamp cable is: by resuming the burned out fuse, the street lamp cable can be instantaneously sent (2-3 seconds). (Note: The short-term instantaneous current will not cause the street lamp cable to rapidly heat, ie Will not cause new damage to the street lamp cable), according to the failure point of the fault current to the power supply is very large, the law of the current down the fault point is small, when the current value detected by the megohmmeter becomes normal, the current value The previous step of the normal value lamp position is where the fault point is located. The order of inspection is: first open the inspection door (or inspection well) at each lamp, and expose the street lamp cable and separate each strand, so as to facilitate the detection of the current using a clamp meter (the clamp meter must be driven to the highest level of the current range. Bit)) From the first time the light starts to detect the current step by step, the control cabinet at the sending, power failure operators and on-site detection of current personnel should be equipped with walkie-talkie, in order to contact. In the step-by-step detection, the clamp meter must first be ready for the cable before it can start to inform the power transmission personnel to send power instantaneously. This method does not need to artificially cut off the load of the main cable and the street light, and does not bring any new hidden trouble points to the street light cable. Through many years of practice, we believe that the detection method is convenient and fast. The testing instrument is also our standing instrument and no need to purchase testing instruments.

Third, with the street lamp cable fault tester to detect a set of street light cable path detection, depth measurement and fault location of the three-in-one instrument. This detector is small in size, placed in the portable toolbox, light weight, single person can easily operate; powered by battery, without 220V power supply, suitable for field operations; cable path search, buried depth, failure point positioning is completed synchronously, efficiency High, free from external interference; unaffected by cable ground conditions (bifurcations, twisted joints, coils), like mines, point-to-point to find faults, errors in centimeters; not affected by ground conditions, such as floor tiles, greening Belt, cement surface, etc. The detector is composed of a transmitter and a receiver. The transmitter can use single-frequency emission or radio frequency emission (audio is suitable for long-distance, RF is suitable for close-distance, interference occasions) according to the site conditions; The stick sensing signal determines the path and fault point of the street lamp cable, and is easy to operate, and accurately locates the fault point of the street lamp cable.
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