In the power system, metallic grounding fault is a common and harmful type of fault. The metal grounding fault locator, as a specialized device for locating such faults, plays an important role in ensuring the safe and stable operation of the power grid. This article will provide a detailed introduction to the application scenarios and daily maintenance methods of metal grounding fault locators.

1、 Application of Metal Grounding Fault Locator

（1） Scope of application

The metal grounding fault locator is suitable for small current grounding system distribution networks, and can detect various hidden grounding faults such as single-phase metal grounding, arc grounding, transition resistance grounding, porcelain bottle breakdown, lightning arrester breakdown, etc. of overhead lines. Whether it is a rural distribution network or an urban distribution network, whether it is an overhead line or a line with cable branches, it can all play its positioning role.

（2） Working principle

After the fault line is shut down, the metallic grounding fault locator applies a high voltage signal to the line through a transmitter to reproduce the fault. Along the route, sensors are hung on insulated poles to detect the applied current signal and transmit data wirelessly to a handheld receiver. Before the fault point, the current signal persists; After the fault point, the current signal disappears. In this way, rough segmentation can be performed first, and then fixed points can be used to quickly determine the location of the fault.

（3） Application advantages

high-precision positioningThe positioning accuracy of some locators can reach1Even higher in height, it can quickly and accurately locate the fault point, greatly shortening the troubleshooting time, reducing the scope and duration of power outages, and improving the reliability of power supply.

Easy to operate: The entire equipment usually consists of a transmitter, receiver, sensor, and accessories. Operators only need to undergo simple training to proficiently master its usage. For example, the transmitter is easy to operate, convenient and flexible, with multiple status prompts and alarm prompt windows; The sensor has a small volume and light weight, making it easy to hang along the line; The receiver is designed for handheld use and adopts a large screen LCD display, which can display real-time information such as sensor status, current waveform, and current value.

Safe and reliable: The transmitter has safety features such as high voltage start locking function and output allowing direct short circuit, which can effectively ensure the safety of operators and equipment. Wireless communication is used to transmit data between sensors and receivers, avoiding potential security risks associated with wired connections.

2、 Daily maintenance methods for metal grounding fault locator

（1） Establish management archives

Establish management files for each instrument, including original data, maintenance records, etc., in order to track and manage the use and maintenance of the instrument.

（2） Develop operating procedures

Establish three major regulations: daily use regulations, safety use regulations, and daily maintenance regulations, and refine various specialized personnel for instruments. Personnel should receive pre job theoretical and operational training, pass the exam, and be able to operate the instrument. Daily checks should be conducted on the instrument's working status; The responsible person should master the professional knowledge of the working principle, structure, and key parts of the instrument, and be responsible for the formulation of testing methods, daily use management and maintenance, and the development of instrument usage; Instrument inspection personnel conduct instrument inspections, communicate with designated personnel, promptly identify abnormalities and hidden dangers, conduct regular maintenance, and master relevant knowledge of electrical appliances, machinery, and other related fields.

（3） Regular inspection and calibration

Appearance inspection: Regularly inspect the appearance of the instrument for any damage, deformation, or other issues, and promptly address any abnormalities.

Electrical performance inspection: Regularly check the electrical performance of the instrument, such as whether the output voltage and current of the transmitter are normal, and whether the sensitivity of the receiver meets the requirements.

Calibration: Regularly calibrate the instrument to ensure the accuracy of its measurement results. The calibration cycle can be determined based on the frequency of use and accuracy requirements of the instrument.

（4） Daily maintenance and upkeep

Cleaning: Keep the instrument clean inside and outside, pay attention to preventing moisture, rust, and interference. Precision instruments should be handled with care, and optical components should be wiped with mirror paper instead of a damp cloth; The mechanical and transmission parts should be cleaned of rust and dirt, and lubricated with oil.

Battery maintenance: For instruments powered by batteries, it is necessary to regularly check the battery level, charge or replace the battery in a timely manner. When not in use for a long time, the battery should be removed and stored to prevent it from rotting and damaging the electrodes.

Storage environment: The instrument should be stored in a dry, ventilated, and non corrosive gas environment, avoiding direct sunlight and high temperature and humidity.

（5） Fault handling

When the instrument malfunctions, it should be stopped in a timely manner and repaired by professional maintenance personnel. During the maintenance process, it is necessary to strictly follow the maintenance manual of the instrument to ensure the quality of the maintenance.

The metal grounding fault locator has important application value in the power system. Through proper application and daily maintenance, its advantages can be fully utilized to improve the accuracy and efficiency of fault location, ensuring the safe and stable operation of the power grid.