GFL1515: Essential for Detecting DC Ground Faults in DC Systems

The GFL1515 is an essential measuring device for detecting DC ground faults in various DC systems. This GFL1515 Detector is crucial for identifying faulty grounding, especially where electrical cables are damaged or show leakage to the ground.

Fault Detection Through Signal Injection

The GFL1515 detects unintentional DC ground faults by injecting a low-frequency signal into the faulted polarity. Using current clamps and a portable receiver, operators can follow this signal to pinpoint the physical location of the DC ground fault.

Online Measurements with High Voltage Tolerance

The GFL1515 enables measurements even in online DC systems. While the device’s output current remains low, its output voltage can reach up to 1000V, allowing it to function safely without interference. Per the NERC PRC 002-6 standard, the battery and DC power system must be checked for unintentional grounding every four months. If a ground fault is found, the GFL1515 allows for precise fault localization without disconnecting the live circuit.

Method for Fault Localization

The GFL1515 uses several methods to locate faults accurately, based on these principles:

Signal Generator and Return Circuit

The signal generator connects to the DC system with two test leads, injecting a low-frequency current signal. This signal flows through the circuit, exits at the faulted grounding point, and finally returns to the generator. This return circuit assists in signal tracing in the next step.

Signal Receiver for Directional Tracking

The signal receiver tracks the signal’s direction, which always points toward the fault. Using one clamp on two busbars, or two clamps on separate busbars, the device works efficiently with strong anti-interference capability, even in online systems.

Signal Strength and Phase Angle Changes

The strength and phase angle of the signal change significantly before and after the grounding fault. These changes help pinpoint the exact fault location with accuracy.

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