Communicable Overhead Fault Indicators , Judged Quickly / Accurately Electric Cable Finder

OverheadLine Communicable with fault line and fault point can be judged quickly and accurately

TYHD-A2/110 OverheadLine Communicable Fault Indicator is applied to 110kV overhead line ,is a device to indicate line fault current. This system is composed of two parts, one is gathering unit and the other is collection unit.gathering unit monitors line running status real-time. When fault happened ,the gathering unit can quickly locate phase-phase short-circuit area,the fault line and fault point can be judged quickly and accurately.in the meantime, the alarm flag turn red and appear flashlight and the fault signal also be transmitted to collection unit. After receiving signal from gathering unit, the collection unit send the received data to master monitoring station through wireless communication (GPRS/CDMA etc.)

The fault indicator’s gathering unit uses gripping structure and coil to induct line current and electrical field signal, these signals are gathered and dealt with through low power consumption single-chip and finish the line load current calculation&short-circuit detection and realize short-distance wireless communication through inner-equipped wireless module with low power consumption,then send the signals to collection unit.

When gathering unit detects that the line current is corresponds to short-circuit characteristics, it immediately transmit the fault information to collection unit nearby through wireless module, in the meantime, alarm appears in means of red flag and flashlight, the collection unit receives every kind of signals then real-time transmit them to the master station monitoring platform through remote wireless communication, the master station will complete the data analysis and fault judgement.

Device application principle is as following diagram:

Functions:

gathering unit introduction:

fault indication:

1)short-circuit and earth fault indication: when short-circuit or earth fault happened,the gathering unit in the correspoding phase of the fault line area detects the fault and sends out the alarm indication.

2)Fault alarm is transmitted remotely: the fault alarm information is outputted in the means of wireless communication.

intelligent reset:

1)permanent fault: automatically reset after power restore in a very short time

2)transient fault: automatically reset, the reset time can be configured as 4,8,12,24 hours before delivery.

Anti-misalarm for load wave: in the status of non-fault wave for line current, the gathering unit will not mis alarm the fault.

Automatically avoid switching-in rush current : when line is powering switch(or recloseing),the gathering unit installed this line can escape the rush current and not mis-alarm.

recloser minimum recognition time:

1)the gathering unit can recognize the transient fault with the recloser duration of 0.2seconds and can alarm accurately.

2)The gathering unit installed in non-fault branch will not mis-alarm when sense recloser rush current after experiencing 0.2 seconds of recloser interval power outage.

Live install and uninstall:the gathering unit for overheadline can be installed and uninstalled lively, in the duration of operation,it will not mis-alarm.

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