DCGFL-999 DC Earth and Ground Fault Locator

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Earth and Ground Fault Locator for fast location of earth faults on the DC system, to avoid the damage in the event of a second fault. Directly locates earth faults, with no need to cut any cables. Current Waveform mode operation.

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:
• The Metravi DCGFL-999 can directly locate earth faults on the DC system, with no need to cut any cables, thus increasing the power network reliability.
• Current Waveform mode operation.
• In current difference mode, the receiver can calculate the difference between the pre-injected and post-injected current values to determine the fault point in real time; the real-time calculation shows the resistive current, greatly improving the test sensitivity and allowing insulation faults to be measured up to 1MΩ.
• In current waveform mode, the receiver uses digital signal processing to analyse the waveform and determine the fault point in real time.
• The unit can identify the presence of any stray AC voltage on the DC network, preventing damage to connected devices.
• The DC system voltage is identified automatically, and the output voltage is adjusted accordingly, e.g. 230V, 110V, 48V and 24V.
• The status of the system earthing is automatically checked with an alarm if an earth is present, which is usually due to a fault condition.
• Indication of the current direction, to assist with fault location.
• The transmitter detects fault information such as positive and negative bus voltage, fault resistance, grounding capacitance, and balance resistance in real time.
• The transmitter can be powered directly from the DC system. Where the voltage is insufficient to do this an alternative AC supply is available.
• The optimal output frequency of the transmitter is automatically determined by measuring the DC earth resistance and the distributed capacitance to earth.
• The receiver has an automatic power-off function, which operates if there is no activity within 60 minutes or there is insufficient voltage from the battery.
• Using wireless communication technology real-time data can be transmitted quickly and conveniently.
• Additional current sensor for applications where the current clamp is unsuitable due to the number of cables or the diameter of a single cable.

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