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DYX-FF Remote Cable Line Fault Indicator

The DYX-FF Remote Cable Line fault indicator is used in 6~35KV Cable line distribution networks, usually installed in Ring Main Unit, Cable Distribution Box, Switch Cabinet, enable the electricity distribution network engineers to quickly identify the faulty section of network and restore power supplies to customers on healthy sections in the shortest time possible. 
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Main Technical Parameters
  • Short circuit sensor mounted cable diameter: outside diameter≤Φ40mm (other specifications shall be customized) 
  • Earth fault sensor mounted cable diameter: outside diameter≤Φ120mm (other specifications shall be customized) 
  • Working Ambient Temperature: -40℃-75℃   
  • Relative Humidity: ≤95%RH  
  • Working Power Supply: CT power supply when the flowing current above 10A, when the current under 10A, will powered by the backup Lithium battery
  • Remote Signal Communication Capacity: AC220V/1A 
  • Remote Signal Communication Reset Method: Manual reset / Auto reset 
  • Automatic Reset Time: 1-48H Selectable (accuracy:±1%); Customer could select before production; Default Settings:12H 
  • Suitable for medium voltage below 35KV rating system.
System Composition

The system of the ground indicator is composed of 3 pcs short circuit sensor, 1 pcs earth fault sensor, and 1 pcs data concentration, and the monitoring central station.
 
Cable Line Installed part include: 
Sensor : 4pcs/SET, include 3 pcs short circuit sensors and 1 pcs earth fault sensor. 3 pcs short circuit sensors respectively installed in A,B,C three phase Cable Line, 1 pcs earth fault sensor installed on the bifurcation unshielded part of three-phase cable.
 
Data Concentrator Unit: Installed inside or outside the Ring Main Unit(or Cable Distribution Box, Switch Cabinet). One data concentrator unit of fault passage indicator can receive fault signal sent by sensors through 433MHz or fiber optic and send to central station through GPRS/3G/4G LTE cellular network. The data concentrator Unit of the underground fault indicators is mainly composed of industrial modem.
 
Monitoring central station include: 
One set data server with software system. Monitoring central station usually setup in power utility office, power substation, etc. When receiving the fault message from the data concentrator unit of the fault path indicators, combined with GIS system, the maintenance crew man could quickly locate the fault site and trouble-shoot. 
 
The software system could be SCADA or other software platform, usually power utility companies have their own software system. Four-faith also have our own-developed software system.       
Remote Cable Line  Fault Indicator Monitoring central station
Note: If customers use their own software system, then should offer Four-faith the software data communication protocol format, so that the FOURFAITH data concentrator could be able to communicate with the software system.

Operation worked example
 
With the remote monitoring central station, the maintenance crew man could be able to accurately locate the fault section via the GIS in the software system, thus save a lot of time for troubleshooting.
 
Short circuit indication
On detection of flowing current value exceed the fault sensitivity threshold, the short circuit sensor will send fault signal through 433MHz or fiber optic to the data concentrator, the data concentrator will send the fault signal through GPRS/3G/4G LTE cellular network to the remote central station, the crew man then could quickly identify and locate the fault section and go for troubleshooting at the pointed site.
 
Earth fault indication
On detection of the zero sequence current value exceed fault sensitivity threshold, the earth fault sensor will send fault signal through 433MHz or fiber optic to the data concentrator, the data concentrator will send the fault signal through GPRS/3G/4G LTE cellular network to the remote central station, the crew man then could quickly identify and locate the fault sectionand go for troubleshooting at the pointed site. 
cable line fault indicator google map


Installation of ground fault indicator:
Remote Cable Line  Fault Indicator installation

General

DYX-FF-C (sensor)
Applicable voltage range 6~35KV (should confirm before production)
Applicable current range 0~630A (should confirm before production)
Applicable power frequency range 45~60Hz (should confirm before production)
MTBF more than 70000H
Impulse current withstand 31.5kA for 2s
Degree of protection IP67
Weight less than 500g
Outline dimension Ф75mm * 115mm


DYX-FF-HX (data concentrator)
Short circuit fault upload Receiving and upload fault information and fault current


Environmental
Environment temperature Operation temperature: -35℃~80℃(-31~+176℉)
Storage temperature: -40℃~85℃(-40~+185℉)
Relative humidity 5~95%( No condensing)
Altitude ≤4000m