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JJZ-FF-C Overhead Line Fault Indicator

  • The JJZ-FF-C overhead fault indicator is used in 5~38KV overhead line networks, 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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  • A high accuracy current sensor in the JJZ-FF-C, monitors the phase current flowing. When detecting current level exceeds a user-selectable threshold (as a result of a phase-to-phase or phase-to-ground fault), the fault is indicated at the same time by both mechanical Flag Indicator, and flashing, high-power LED indicator.
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  • The fault is located between the last indicator that has been triggered and the first indicator which is still inactive. The path of the fault current from the feeding point to the fault location is marked by the triggered indicators.The unit resets automatically when power to the line is restored, or after a user-selectable timer period.
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  • The indicator can be mounted under live conditions with the help of an adapter and a hot stick. The indicator could be self-sustained by the monitored network from a current flow of 10A upwards. The indicator also with built-in lithium battery that could powered the indicator for more than 10 years.
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Main Technical Parameter:
  • LED indication with 360 degrees of visibility
  • Dual indication (High-Visibility Flag & High-Power LEDs)
  • Mounting can be performed while equipment is energized
  • Hot-stick Line-mountable
  • User-selectable fault trip level
  • User-selectable fault response time
  • User-selectable reset time after power return

1. Local indication
On detection of fault current above the fault sensitivity threshold and for the minimum required duration the JJZ-FF-C indicator will respond both by mechanical Flag Indicate, and flashing, high-power LED indicate.
Indicator in ready status Indicator in flag &flashing status


2. Indication period & reset
The indication period is user-selectable but should be preset before manufactured. The default value is 12 hours flag&flashing when a fault is detected.
If the fault section restore power sooner than the default value (let’s say, 12 hours), then the indicator will return to the ready state (flag return from red to white, LED not flash) ; If the fault section still not be able to restore power after the default value (12 hours), then the indicator still will return to the ready state.


3. Identify the fault section
The fault is located between the last indicator that has been triggered and the first indicator which is still inactive. The path of the fault current from the feeding point to the fault location is marked by the triggered indicators.
Note: The diagram above indicate that the fault section is between the point 5 and point 6.


4. Installation
The indicator can be mounted under live conditions with the help of an adapter and a hot stick.
Four-faith offer the adapter like below. Hot stick not offer since it is universal.
Note: Put the indicator into the adaptor and fix the the spring of the indicator with the hook of the adaptor.

General
Applicable voltage range 5~38KV
Applicable current range 0~600A
Applicable power frequency range 45~60Hz
Angle of visibility 360°flashing insight
Fault flashing interval 5s
Duration of flashing 50ms
Sensitivity 0A~100A: ±3A
100A~600A: ±3%
Static power consumption less than 20uA
Auto reset time 1~48h user-selectable
Identification of fault current duration 20ms~40ms
MTBF more than 70000h
Impulse current withstand 31.5kA for 2s
Protection level IP67
Weight less than 500g
Outline dimension Ф75mm * 115mm
 
EMC
Electrostatic discharge Can withstand the GB/T 17626.2 of the IV level of electrostatic discharge interference test
Contact discharge: + 8KV
Air discharge: + 15KV
EFT/B immunity test Can withstand the GB/T 17626.12 of the IV class fast pulse group interference test
Voltage peak value: 2KV
Frequency: 5KHz & 100KHz
Radiated susceptibility Can withstand the GB/T 17626.3 of the IV level RF electromagnetic field immunity
Field strength: 30V/m
Surge immunity Can withstand the GB/T 17626.5 of the IV level surge (impact) interference test
Common mode voltage: 4KV ± 10%
Differential mode voltage: 2KV ± 10%
Power frequency magnetic field immunity Can withstand the GB/T 17626.8 of the V level power frequency magnetic field immunity interference test
Magnetic field intensity: 100A/m
Damped oscillatory magnetic field immunity Can withstand the GB/T 17626.10 of the V level damping oscillation magnetic field immunity test
Damped oscillatory magnetic field intensity peak value: 100A/m
 
Environmental
Environment temperature Operation temperature: -35℃~80℃(-31~+176℉)
Storage temperature: -40℃~85℃(-40~+185℉)
Relative humidity 5~95%( No condensing)
Altitude ≤4000m