Beijing Tianyihongda Science & Technology Development Co., LTD
Sincerity Is Fundamental, Clients Is The First. Strict Quality Control, Earnest Service Supply.
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TYHD-A12 cable earthed fault indicator is applied to cable system below 35KV, with function of zero-sequence current measurement and data transmit function, it indicates fault when earth fault happened in cable, It can help line finder find the fault quickly .shorten power-off time,improve the reliability of power supply,be convenient for users to monitor the zero-sequence load current of line on real time.
Data transmission Unit is applied in power distribution network, used for data gathering and transmission for load detection ,fault detection and location in cable.
Working principle:
Date Transmission Unit is to make photoelectric translation,process and analyze the fault signal from short-circuit fault indicator and earth fault indicator transmitted through optical fiber.then send the fault signals to master station by GSM or GPRS after analysis and processing to realize fault detection,fault location and load current measurement of power distribution network .
Function:
1)Optical fiber receiving: receive signals of fault point and load current from indicators by optical fiber network
2) GSM or GPRS sending: send device status,line load current,indicator status and fault information to master station by GSM/GPRS and make sure the fault information can be transmitted reliably
3) Power supply:power supply method is flexible. PT supply or two road of CT supply, if primary current is above 10A,it can work normally.
4)communication protocol:IEC870－5－101 or IEC870－5－104 to transmit fault information or shift information.
5) Remotely upgrade:device can easily be upgraded remotely
Technical parameters:
| DTU size | height×width×thickness=399mm×286mm× 84.5mm |
| weight | <5Kg |
| Rate working voltage | CT supply not less than 10A |
| PT supply AC220V±20% | |
| whole-set static power consumption | Below 240mW |
| whole-set maximum power consumption | 570mW |
| equipped indicator numbers | 32pcs |
| GPRS module | E-GSM/GPRS 900/1800 double-frequency band |
There is type test report for it, test items as following:
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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. |