GPRS Connecting Earth Fault Indicator For Underground Cable Communicated

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

The TYHD-A11cable indicator is suitable for the cable 35kV system (including bellow 35kV system).It can indicate while there is short circuit ,measure electric current,measure temperature(temperature probe attached) and transmit data.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 load current of line on real time.

The principle is clip-on line sensor and intelligent controller . The intelligent controller control as the core with little power consumption ,The clip-on sensor can measure the load current on real time,and transmit the current data by fiber timing. When a circuit has a short circuit fault,The cable short circuit indicator recognize it automatically ,then judge intelligently ,then display locally.At the same time transmit the action signal to the panel type indicator installed locally by fiber,which can display locally on the panel .Of course,It can transmit the data to fiber type monitoring terminal by data remote interface,realizing the remote transmission of fault signal and measured data.

Performance index:

Environment index:

1.environment temperature:(-40～70)℃ maximum daily temperature difference is 25℃.

relative humidity:5～95%

altitude height:＜2000m

2.system specification

cable outer diameter: 10～40mm

system voltage:≤35kV

system frequency:50Hz

maximum over-current protection time delay adaptable :＜10S

3.main technical performance and parameters

working power:taking electricity from line sensing current, one 3.6V/2Ah lithium battery is equipped for supply；

static power consumption:3.6V power supply＜18uA

designed life:10 years

measurement accuracy:0～600A:±3A or3％

Device structure:

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