Views:291 Author:Site Editor Publish Time: 2020-08-12 Origin:Site
The fault indicator is installed in overhead lines, power cables, box transformers, ring main units and cable branch boxes, which is used to indicate fault current flow. Once the line fails, the line patrol personnel can quickly determine the fault section and find the fault point with the help of the alarm display of the indicator. At the same time, the fault indicator can detect the running state and fault location of the line at any time, such as power transmission, power failure, grounding, cable short circuit, over-current, etc. When the operation state of the line changes, the operator on duty and the management personnel can be informed quickly, which can greatly improve the reliability of power supply and the satisfaction of users. Carry out information management for the line and the equipment operation.
At present, with the development of technology, the technological content of fault indicators is constantly improved, and there are many kinds of fault indicators. According to the different points of transmission and distribution circuits, there are various specifications and models of products, mainly including the following series.
1. The short circuit fault indicator
This device is used to indicate the flow of short circuit fault current. The principle of this method is to detect the fault point by using the positive mutation of current and the power failure of the line. Once a short-circuit fault occurs, the line patrol personnel can quickly determine the fault section, branch and fault point with the help of the alarm display on the indicator.
2. The short circuit and earth fault indicator
In the design, the short circuit and earth fault indicator comprehensively considers the characteristics of the transmission line when grounding and short circuit. On the one hand, according to the principle of grounding detection, the transient capacitor discharge current and the line voltage drop can be detected, so the line is considered to be grounded, otherwise, the line is not grounded. On the other hand, just like the principle of the short circuit fault indicator mentioned above and for finding a short in a circuit.
3. The panel type fault indicator
This kind of fault indicators is mainly used in high voltage cable and multi cable power supply system. It has the functions of short circuit current alarm indication, grounding alarm indication, automatic reset system, manual reset and test, etc.
4. The high voltage line fault indicator
This kind of line fault indicator is used for 110kV and above lines to detect grounding or short circuit fault point. It is divided into the single power supply line and the double power supply network power supply line indicator.
5. The fault detection system with signal source
This system is usually used to indicate the grounding or short circuit fault point of overhead lines. It can also be called overhead line fault indicator. The detection principle is that when the line has a grounding fault, the signal source receives the signal from the PT of the transformer substation, and after judgment, it sends out the command, and the signal source feeds back to the fault indicator hanging on the phase line.
The remote monitoring system can monitor all kinds of operation states of the line in real time, such as power transmission, power failure, phase loss, grounding, short circuit, over-current, etc., and quickly confirm the change and location of the operation state of the monitored line. When happening power transmission, power failure, phase loss, grounding, short circuit, over-current and other operating conditions of the line change, the line signal collector of the digital indicator detects the changed signals, then the changed signals are transmitted out by wireless devices in the form of coding. The power supply station is used as the receiving terminal, and after being processed by computer, it will inform the personnel on duty by means of sound and light alarm and screen display.
The above mainly describes some types and functions of the fault indicator. Our company is a professional manufacturer of all types of fault indicators.