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HF-GT-215 DC Ground Fault Locator
The DC Ground Fault Locator is specially developed for DC power systems. It accurately locates positive and negative pole grounding faults under live operating conditions. With excellent anti-interference performance, lightweight portable structure and simple operation, it is widely applied in power substations, communication power rooms and industrial DC power supply inspection work.
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Ground faults in DC power systems occur frequently and bring severe hazards to power grids. Either positive pole grounding or negative pole grounding may lead to protective relay misoperation or refusal to operate, disrupting the normal operation of the power system.
The Chinese Electric Power Industry Standard DL/T856-2004 specifies setting values for ground faults of various DC systems. When the system ground resistance falls below the specified threshold, the system is confirmed to be under faulty operation and requires immediate troubleshooting.
Due to the complexity and dynamic characteristics of DC systems, DC ground fault points are often hard to locate. The traditional pull-out circuit method is no longer permitted by current regulations for fault location, as it cannot guarantee system operational safety during troubleshooting.
To help on-site maintenance personnel quickly and accurately pinpoint ground fault points, our company has developed this portable DC ground fault finder based on years of field experience. It can diagnose various insulation faults for DC systems of 48V, 110V and 220V, including intermediate grounding, non-metallic grounding, loop grounding, simultaneous positive & negative grounding, balanced positive-negative grounding, AC-DC mixed grounding and multi-point grounding faults.
The HF-GT-215 DC System Ground Fault Tester adopts high-resolution sensor units to collect leakage current at grounding points. It can measure ground insulation resistance within 600kΩ under the 220V voltage level, featuring fast detection and precise positioning, which thoroughly solves insulation fault issues in DC power systems.
Working Principle
The portable DC ground fault finder operates based on leakage current signals produced at grounding points. If insulation failure takes place on any branch of the DC system, leakage current corresponding to the insulation resistance will form between the circuit and ground.
When insulation degradation with resistance Rx emerges on the negative pole, the total current passing through the positive and negative power cables feeding load RL will alter correspondingly.
By analyzing the system ground voltage and leakage current of each branch, the tester evaluates the overall insulation level of the system and locates insulation fault points on branches:
- Testing at the upper side of the grounding point: the instrument outputs an insulation fault alarm signal
- Testing at the lower side of the grounding point: the instrument indicates normal insulation status
This working principle enables precise positioning of ground faults.
The whole device is composed of two units: an Analyzer and a Detector.
- Connect the power wires of the Analyzer to the positive busbar, negative busbar and ground terminal of the measured DC system, then switch on the power supply. The Analyzer automatically analyzes the system insulation performance and displays parameters such as positive-to-ground voltage, negative-to-ground voltage and ground resistance on the LCD screen.
- When abnormal insulation is identified, operators can use the Detector to find the precise grounding location.
Wireless data communication is built between the Analyzer and Detector.
Fitted with a high-precision sampling module, the Detector measures leakage current of each branch. It receives ground voltage data wirelessly sent from the Analyzer, and further calculates the insulation resistance of the tested branch based on the collected voltage and current values.
Fitted with a high-precision sampling module, the Detector measures leakage current of each branch. It receives ground voltage data wirelessly sent from the Analyzer, and further calculates the insulation resistance of the tested branch based on the collected voltage and current values.
Main Functions
System Ground Voltage Measurement
It measures positive-to-ground voltage, negative-to-ground voltage and overall system voltage, with a monitoring range of 0 ~ 300V.
System Insulation Resistance Measurement
Capable of testing the ground insulation resistance of both positive and negative poles; measuring range: 0 ~ 999.9kΩ.
AC Interference Detection
Detects AC intrusion faults within DC systems and measures superimposed AC voltage, with an AC voltage measuring range of 0 ~ 280V.
Branch Insulation Resistance Measurement
Separately measures the positive and negative pole ground insulation resistance of each individual branch circuit.
Branch Ground Fault Location
Accurately locates the precise grounding point on faulty circuit branches.
High-Precision Ammeter Function
Can be used as a high-precision ammeter, with a current resolution reaching 0.01mA.
Passive Ground Fault Search (No Signal Injection)
Locates grounding points without injecting any signals into the DC system, so the normal operation of the power system will not be affected.
Direction Indication Function
Displays directional arrows for faulty branches to indicate the relative position between the detection probe and the grounding point, which significantly boosts fault checking efficiency.
Insulation Index Analysis
After completing the detection of each branch, the detector generates an insulation index for users to evaluate insulation conditions.
Waveform Curve Display
The screen displays real-time current change waveforms of tested branches, helping users find fault points quickly and visually.
Packing List: DC Ground Fault Locator
| No. | Item Description | Quantity | Unit | Remarks |
|---|---|---|---|---|
| 1 | Main Analyzer Host | 1 | Set | Central control unit with LCD display |
| 2 | Portable Detector Unit | 1 | Set | Handheld probe receiver for onsite tracing |
| 3 | System Connection Power Cables | 3 | Pcs | Connect positive bus, negative bus & ground terminal |
| 4 | Detection Antenna / Inductive Probe | 1 | Pc | For branch leakage current pickup |
| 5 | Charging Power Adapter | 1 | Pc | For charging detector built-in battery |
| 6 | User Operation Manual | 1 | Book | English & Chinese bilingual version |
| 7 | Factory Calibration Certificate | 1 | Copy | Official metrology verification document |
| 8 | Shockproof Aluminum Alloy Carrying Case | 1 | Pc | Integrated storage & transportation box |
| 9 | Packing List Document | 1 | Copy | This checklist |
FAQ – DC Ground Fault Locator
1. What is a DC Ground Fault Locator used for?
This device is professionally designed to detect and locate various ground faults in DC power systems, including positive/negative grounding, multi-point grounding, AC-DC mixed grounding and weak insulation faults. It is widely used in substation DC screen maintenance to ensure safe and stable system operation.
2. What DC voltage levels does it support?
It adapts to common DC system voltages of 48V, 110V and 220V, covering most power station and substation DC system inspection scenarios.
3. Does the tester need to inject signals into the DC system?
No. It adopts passive detection technology without any signal injection. It will not interfere with the normal operation of the DC system, ensuring zero impact on on-site running equipment.
4. What parameters can this instrument measure?
It can test positive-to-ground voltage, negative-to-ground voltage, total system voltage, system insulation resistance, branch insulation resistance and superimposed AC interference voltage. It also supports high-precision leakage current detection.
5. How accurate is the fault location?
Equipped with a high-resolution acquisition module and real-time waveform analysis, the instrument can accurately locate tiny insulation defects and weak grounding points. The current resolution reaches 0.01mA, ensuring sensitive and reliable detection.
6. Can it detect AC intrusion faults in DC systems?
Yes. The built-in AC interference detection function effectively identifies AC voltage intrusion inside the DC system and measures the superimposed AC voltage (0~280V), helping eliminate complex mixed faults.
7. How does the direction indication function work?
The detector displays directional arrows in real time, clearly indicating the relative position between the probe and the grounding point. It helps staff quickly narrow down the faulty branch and greatly improve troubleshooting efficiency.
8. What is the insulation resistance testing range?
The system insulation resistance test range is 0~999.9kΩ, which fully meets the requirements for daily preventive inspection and fault troubleshooting of power DC systems.
9. Is the device easy to operate on site?
The device consists of an analyzer and a wireless detector. After simple wiring of the host, the system automatically analyzes insulation status. The handheld wireless probe enables fast, flexible and non-stop on-site testing.
10. Does it support data analysis and waveform display?
Yes. It provides real-time current waveform curves and automatic insulation index evaluation for each branch, allowing engineers to judge fault severity and insulation deterioration status more intuitively.
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