Underground Fault indicator DYO-FIA

Overview

The DYO-FIA cable fault indicator is an online monitoring device installed on medium-voltage cable lines. It is used to monitor the cable's operating status in real time and quickly locate line faults such as short circuits and grounding. This product uses a split-core current transformer (CT) to detect fault current, eliminating the need to cut cables or interrupt power supply, making installation faster, safer, and more reliable.

The product is widely used in ring main units, branch boxes, transformer substations, cable trenches, and cable tunnels in 5kV–38kV distribution cable lines, and is a crucial monitoring unit for rapid fault location in smart distribution networks

Feature and Benefit

High-Reliability Fault Detection

Short Circuit Fault Detection
Short circuit fault detection is achieved by detecting sudden changes in cable current and direction using an open-type CT.Ground Fault Detection
Single-phase ground fault location is achieved by combining with zero-sequence current measurement.Dynamic Threshold Judgment
The open-type CT has high accuracy and can automatically adjust the detection sensitivity according to the load, improving the accuracy of fault identification.
Convenient open-type CT design

No wire breaking, stripping, or power outage required
Installation is simple: just snap the open-type CT onto the outside of the c able.
Installation time is extremely short, typically 1–3 minutes per point.
Strong anti-interference capability; optimized CT magnetic circuit design ensures accurate measurements even under high current surges or tightly packed cables.
Diverse Indicators

Local indicators, including LEDs, multi-color flashing, etc., display permanent faults, ground faults, transient faults, low voltage alarms, and directions.
Industrial design adapted to harsh environments

Fully sealed structure, IP68 protection rating. Wide operating temperature range: -15℃ to 55℃.
Moisture-proof, salt spray-proof, and corrosion-resistant design, suitable for long-term use in underground cable trenches and ring main units.

Technical Parameter

Technical specifications

Parameter	Value
Application	Network:Voltage Level 5~38KV Frequency: 50 Hz and 60 Hz Neutral system: Direct, resistive, isolated Substation:MV/LV
Fault Detection	Earth-fault Trip Current setting (Phase to Ground): 20A/80A/120A/160A, default 20A Phase fault Trip Current setting(Phase to Phase): 200A/400A/60OA/800A,default 200A
Response Delay Time	Earth-fault duration:100ms/150ms/200ms/300ms,default 100ms Phase fault duration:100ms/150ms/200ms/300ms,default 100ms
Outdoor Light Indication	Total Light Flow:7 Lm Flashing Period: 2s Standard Flashing Capacity: 500h
Power Supply	Lithium Battery:Standard life duration up to 10 years External Power Source:220~240V AC
Interface	I/O Interface: 1DI: 9-38V DC input 1DO:Maximum switching voltage 250VAC/30VDC Maximum switching current 2A 1External LED lamp interface AC Input: 1AC220-240V voltage recovery interface
Reset	Timing Reset: 4h, 8h,16h, 24h, adjustable by DIP switch Button Reset: Manual by push-button DI Reset: By 9-38V DC wide voltage input AC Voltage Reset: By AC220-24OV recovery Current Reset: Load current reset
Protection Level	Display Unit IP54&IK07 External LED IK07
Environmental Limits	Environment Temperature:-15°Cto +55°C Relative Humidity:≤95%RH Altitude:≤2000m
Mechanical Characteristics	Dimension H xLxD:210mmx170mmx60mm Weight: 1kg
Standards	Electrical Tests: IEC 6100-4-2,IEC 6100-4-4,IEC 6100-4-5 Mechanical Tests:IEC 60255-21-1