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|Alarm Flag:||Turn Red||Characteristic:||Short-circuit|
|Function:||Intelligent Reset||Collection Unit:||DTU Originally|
resistance fault locator,
electric cable finder
online location and detection system with alarm flag turn red and appear flashlight
TYHD-AI/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 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.
TYHD-AI/110 overhead line remote transmission fault indicator is composed of gathering unit and collection unit. gathering units complete the judgement of short-circuit and local alarm;collection unit completes the fault signals and data transmission.
1.Short-circuit detection 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
1)From running current sudden changed to fault current, that is, there is a positive △I change.
2)Current protective appliance of Upstream circuit-breaker will drive the circuit-breaker triggered or the fuse wire is fused out, its fault current existing duration is the fault current clearance duration of circuit-breaker(=protective appliance alarm time+switch alarm time+fault current arc failure time), or fusing time of fuse cut-out.
3) Line is powered off, the line current and voltage is decreased to zero.
There is type test report for it, test items as following:
Type Test Items
|1. appearance and structure 2.function 3. electrical device performance 4.low temperature performance 5.high temperature performance 6.alternating temperature humidity7.vibrationendurance 8.incline drop test 9. electrical device life 10. static electricity and elecro-discharge immunity test 11.radio frequency electromagnetic field radiated immunity test 12.surge impact immunity test 13. power frequency magnetic field immunity test. 14. Adjacent interference test 15.short-circuit withstand impact test 16. fire hazard test 17. power consumption test 18. protection grade test 19. gripping strength test of grip structure.|
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