DCGFL-999 DC Earth and Ground Fault Locator

Description

The Metravi DCGFL-999 DC Earth and Ground Fault Locator has been developed for the fast location of earth faults on the DC system, to ensure the damage which would occur in the event of a second fault is avoided.

The system quickly and accurately finds the fault point, while overcoming the influence of the distributed capacitance of the system, greatly improving the accuracy of the measurement.
It provides effective location of high resistance faults, low resistance faults, faults creating system loops, on systems with single or multiple faults. It can also identify the presence of AC interference on the DC system.

The DC system in a substation provides power to a variety of equipment involved in the control and protection of the electrical power system. It is therefore very important that this system is working correctly.
As the DC system is a floating unearthed system, an earth fault on one terminal will not cause any disturbance and the system will continue to run normally.
However, should an earth fault occur simultaneously on the other terminal, it will result in a virtual short-circuit between the two terminals through the earth, causing the failure of the DC supply in the substation. To prevent this, it is important to identify the fault location quickly and precisely when the initial fault occurs.

Features:

• Helps in detection of DC network earth faults on a live system
• Automatic identification of positive and negative DC bus voltages
• Detection of AC interference on the battery system
• Measurement of fault resistance, capacitance to earth and balance resistance
• The transmitter power is taken directly from the system, an external supply. Is only required if the system voltage is too low.
• High sensitivity: up to 1MΩ for 1000V version; 500kΩ for 500V version; 250kΩ for 250V version
• Wireless communication technology provides real-time data transmission, between the transmitter and receiver, conveniently and quickly.
• Inductive sensor as an alternative to the clamp for large diameter cables

A DC Earth Fault Locator is essential for industries that rely on DC power systems and require fault detection and insulation monitoring to prevent failures, downtime, or safety hazards.

Key industries that can benefit from using the Metravi DCGFL-999 DC Earth and Ground Fault Locator:

• Power Generation & Distribution
  • Solar Power Plants – To detect ground faults in solar PV systems, battery storage, and inverters.
  • Hydroelectric & Thermal Power Stations – For DC excitation systems, battery banks, and control circuits.
  • Wind Energy Systems – To ensure the DC circuits in wind turbines remain fault-free.
• Railways & Transportation
  • Metro & Electric Railways – Used for DC traction power supply systems to detect faults in cables, substations, and overhead lines.
  • Automotive & Electric Vehicles (EVs) – Essential in EV battery management and charging stations to identify insulation faults.
  • Aerospace & Marine – For monitoring DC electrical systems in aircraft and ships to ensure safe operations.
• Telecommunications & Data Centers
  • Telecom Towers & Exchanges – To detect faults in DC power supply systems and backup batteries.
  • Data Centers – Helps monitor DC UPS (Uninterruptible Power Supply) systems and power distribution units (PDUs).
• Industrial Manufacturing & Automation
  • Steel & Cement Plants – DC drives, control circuits, and battery-operated machinery require continuous monitoring.
  • Oil & Gas Industry – DC power systems in pipelines, drilling rigs, and refineries must be protected from ground faults.
  • Chemical & Pharmaceutical Plants – Used in DC process control and instrumentation to ensure safety.
• Defense & Military Applications
  • Naval & Submarine Systems – Used for DC electrical systems in ships and submarines to prevent failures.
  • Radar & Communication Systems – Ensures continuous operation of DC-powered military equipment.
• Healthcare & Hospitals
  • Medical Equipment & MRI Machines – DC fault locators are used in critical power backup systems and imaging equipment.
  • UPS & Battery Systems – Ensures uninterrupted power for life-saving equipment.
• Mining & Tunneling Operations
  • DC-Powered Drilling & Conveyor Systems – To prevent electrical hazards in underground mines and tunneling projects.
  • Battery-Operated Vehicles – Used to monitor and maintain battery safety in electric mining vehicles.
• Renewable Energy & Battery Storage Systems
  • Energy Storage Systems (ESS) – For large-scale battery storage and grid backup applications.
  • Microgrids & Off-Grid Systems – Essential in remote or islanded power systems relying on DC storage.