Comewill, a trusted China Manufacturer and Supplier of electrical protection devices, offers high-quality Fault Indicators for overhead lines, cable networks, and switchgear panels. Our Fault Indicators are designed to provide accurate, real-time detection of short-circuit and grounding faults, ensuring safe and efficient power distribution.
A Fault Indicator is an electromagnetic induction device that identifies the presence of short-circuit currents and signals the fault location with a visual display (usually a red card). Installed along distribution lines, it instantly activates when a short-circuit occurs, allowing maintenance teams to trace the fault point efficiently.
Detects line current through electromagnetic induction.
Measures voltage via the spatial electric field’s potential gradient.
Activates a visual alarm when a fault occurs, then automatically resets after a set period.
Overhead Type: Integrated sensor and display unit mounted on overhead lines (bare or insulated). Supports live loading/unloading without false alarms.
Cable Type: Mounted on cable lines, busbars, or distribution equipment (e.g., cable branch boxes, ring main units). Includes three-phase and zero-sequence fault indicators.
Panel Type: Sensor and display communicate via optical fiber or wireless, with reliable insulation between primary and secondary sides. Typically embedded in switchgear or ring main unit operation panels.
On-site Fault Indicator: Provides local visual alarm (red card) without communication; requires manual fault diagnosis.
Communication Fault Indicator: Transmits fault data via wireless or fiber optic communication to main stations. Supports telemetry and remote monitoring of switch status, energy storage, and line conditions.
Short-Circuit Fault Indicator: Detects sudden changes in current to indicate short-circuit faults; adapts to load fluctuations.
Single-Phase Grounding Fault Indicator: Detects single-phase grounding faults using grounding detection principles.
Combined Grounding and Short-Circuit Fault Indicator: Monitors both short-circuit and grounding conditions for comprehensive fault detection.
Fault Indication: White during normal operation; red when a fault occurs.
Online Operation: Designed for long-term outdoor live operation without manual maintenance.
Automatic Reset: Timer-controlled automatic reset after a fault event.
Variety of Types: Overhead, cable, busbar, and panel types available.
Live Loading and Unloading: Supports live installation and disassembly for most types of Fault Indicator.
Mature Technology: From mechanical to mechanical-electronic designs, widely used in medium and low-voltage switchgear.
Medium and low-voltage switchgear panels
Overhead distribution lines
Cable networks, ring main units, and busbars
Industrial, commercial, and utility power systems
