Intelligent Underground Cable Fault Indicators Current Automatically For Short Circuit 

The TYHD-3 cable indicator is suitable for the cable 35kV system (including bellow 35kV system).It can only judge short-circuit, without locally indicating function. When short-circuit happened in cable,It can help line finder find the fault quickly .shorten power-off duration,improve the reliability of power supply,The picture of product is below:

Working principle:

Using clip-on line structure of fault detector as sensor of measuring load current. The intelligent controller control as the core with little power consumption ,When a circuit has a short circuit fault,The fault detector automatically recognize fault current characteristics to judge intelligently. In the meantime. the action signal will be transmitted to the panel indicator installed locally by fiber and locally indicating,then the panel indicator send the wireless signal to DTU to realize the remote transmission of fault signal.

Installing methods:

Clip the indicator on the line as shown in the pictures1.2.3, rotate the screws clockwise to fix it and tighten the fault detector, connect the fault detector and panel indicator through short-distance plastics optical fiber; make sure to insert the optical fiber to the other end and tighten the nut. The length of the optical fiber should be less than 10m,The shorter the distance ,the higher the reliability .optical fiber cross-section is cut flat with a paper cutter, which is beneficial to the transmission of fiber signal

After the test completely cover the rubber cover,in order to avoid abnormal indicator accused by long-term light leakage

Function:

1) Install and disassemble easily, be suitable for Cable lines with an external diameter of less than 40 mm.

2 ) detect short circuit

3 ) epoxy resin pouring,whole-sealed structure, suitable to run outdoors for a long time.

4) The line load current can be detected automatically, no need to configure alarm parameters.

5) Inhibiting the switch-off surge current automatically.

6) Fiber data communication:

Indicating locally the fault alarm signal transmitting from fault indicator to panel indicator(if no panel indicator, this function is not available).

7) Taking electricity from cable current, equipped with built-in storage lithium battery, life is more than 15 years.

There is type test report for it, test items as following: