Views: 154 Author: Site Editor Publish Time: 2021-05-11 Origin: Site
The overhead fault indicator is a device used to detect short circuit and grounding fault. In a network distribution system, especially a system that uses a large number of network load switches, if a short-circuit fault or grounding fault occurs in the lower-level distribution network system, the upper-level power supply systemmust be disconnected within the specified time to prevent major accidents. By using overhead fault indicators, the faulty part can be marked. Maintenance personnel can quickly find the faulty section based on the alarm signal of the line fault indicator, and disconnect the faulty section, so as to restore the power supply of the fault-free section in time, which can save a lot of working time and reduce the time and scope of power outage.
The power line fault indicator is composed of electronic components and mechanical structure. It is installed on the power cable and collects the load current of the line when the line is in normal operation. When the line fails, it is a device to judge the electric short circuit fault of the power line and give an indication signal.
According to the needs, it is installed on the overhead lines, power cables and switchgear main lines to indicate the fault current path. Using fault circuit indicators can help us take first-aid measures in time, so as to better ensure the safe operation of the line and better provide protection for people's production and life. If you can use a fault current indicator, you must understand some of its basic knowledge. Once the line is short-circuited, the line inspector can use the red alarm display on the fault pass indicator to quickly determine the faulty section, branch and fault point. It completely changes the past blind line hunting. The shell of the short circuit fault indicator is made of high-strength polycarbonate material, which is not afraid of impact, has good perspective and corrosion resistance. The card line part is made of special iron material, and the surface is electroplated after special heat treatment, which has a high magnetic permeability effect and corrosion resistance. Its structure is reasonable, and it can easily realize live installation and live disassembly. The circuit part adopts intelligent circuit and special chip, and provides two types with 3V lithium battery and without battery for users to choose and use.
1) Reset time after instantaneous fault: The reset time after instantaneous fault can be set in the control program. This is conducive to the search for instantaneous fault points after successful re-closing. If the user does not mention this requirement, make it reset immediately after power-on.
2) The difference between with 3V lithium battery and without battery.
A. After the line is powered on, the fault will be detected after 30 seconds with the 3V lithium battery fault indicator, and the fault will be detected after 5 minutes without the battery.
B. With a 3V lithium battery indicator, the line working current is required to be ≥2, with a fault indicator without batteries, the line working current is ≥1.