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|Applicable Voltage:||110kV Overhead Line||Composition:||Gathering Unit And Collection Unit|
|Function:||Monitor Line Running Status Real-time||Locate:||Phase-phase Short-circuit Area|
|Alarm:||Flag Turn Red And Appear Flashlight||Communication:||Wireless, Through GPRS/CDMA|
cable fault indicator,
wiring fault detector
TYHD-AI/110 OverheadLine smart power line 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 master station monitoring software analyze the received data and network topology, then to confirm the fault location and appear audible and visual alarm signal, in the meantime, the master station send the analyzed fault information to the operator’s cellphone and help them to find the fault point quickly, it reduces the power-off duration and improve the power supply reliability. Note: gathering unit is named fault indicator and collection unit is DTU originally.
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:
communicable fault indicator application principle
Short-circuit detection adopts load current self-adaption intelligent sudden changes method. According to the characteristics of short-circuit, it judges the fault through electromagnetic inductive method to detect the sudden changed current in line and sudden changed current duration,it is a kind of fault detection device which automatically adapts to load current changes and only related with short-circuit current component.The short-circuit detection principle is that the line current will change as the following diagram when fault happen
(3) Line is powered off, the line current and voltage is decreased to zero.
According to this characteristic, the short-circuit detection criteria of self-adaption short-circuit fault indicator can be summarized as following
In the above, △IF is fault current component or current variable quantity, Iset is interior default value, there is a little difference for different type of indicator installed in different site.△T is fault lasting time,T1,T2 are interior default value,it is determined by system’s protection and switch performance; T1 is the fastest time that the fault is cleared,T2 is the most possible longest duration required for fault clearance ,IH,UH are current and voltage value after fault.the above judgment criteria can be described as: when line current gets a positive sudden change,its changed quantity is above a certain setting value, then the current and voltage decreased to zero in a short time, then the line current is judged as fault current. Obviously, it is only related with short-circuit current component when fault happen and there is not direct relation with line current value in normal working status. So it is a fault detection device which can adapt to load current changes. Its judgement criteria is comparatively complete and can largely reduce the possiblity of mis-alarm.