Beijing Tianyihongda Science & Technology Development Co., LTD
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RTU wireless communication fault indicator of cable type data transmission easily
Data Transmission Unit function is to receive wireless signal from panel indicator then to demodulate and decode,then send the signal to central station by GSM or GPRS.
Working principle:
Date Transmission Unit is to transmit the fault signal from panel indicator which is transmitted from short-circuit fault indicator and earth fault indicator through optical fiber. DTU receive data wireless from panel indicator ,then send the fault signals to master station by GSM or GPRS after analysis and processing to realize fault detection and fault location of power distribution network .
Main characteristics:
1.Wireless receive:receive fault point information from panel indicator through wireless
2.GSM OR GPRS send: send status and fault information to master station,requires confirm detailed requirement before order.
3.Main supply: powered by two roads of powered CT, back up used each other, if primary line current is not less than 10A, back-up power will not be consumed; or PT powered.
4.Back-up power supply:equipped with free-maintenance 5AH lithium battery. Under condition of no power for main power source, it can keep device working 5-8 years and fault information not lost and no need to complement energy.
Function
1.wireless receive: receive fault point signal from panel indicator by wireless
2.GSM or GPRS transmission: send status information, fault information to master station by GSM or GPRS.
3. Power supply way: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
5. Remotely upgrade:device can easily be upgraded remotely.
Technical parameters
| DTU size | height×width×thickness=330mm×230mm×90mm |
| weight | <5Kg |
| Rate working voltage | PT power supply；For CT supply,primary line current is not less than 10A |
| Static power consumption | <1mW |
| wireless receive distance | ≥10m |
| Wireless frequency | 433MHz or 865-869MHZ |
| GSM module | E-GSM/GPRS 900/1800 double-frequency band |
| Lithium battery life | ≥5 years |
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. |