Transient ground wave partial discharge live detection is a method used to detect partial discharge phenomena in equipment such as high-voltage switchgear. The following is a detailed explanation of the method:

1. Basic principle
Partial discharge refers to a small-scale discharge phenomenon caused by excessive electric field strength in a local area in the insulation layer of high-voltage equipment due to uneven electric field distribution, bubbles or impurities in the insulating medium, etc. This discharge phenomenon will generate electromagnetic waves, some of which will propagate through the joints of the metal shell or the gas-insulated switch lining to form transient ground waves.

2. Detection method
Sensor setting:
A dedicated transient ground voltage sensor is set on the outer surface of the switchgear, and the metal wall is usually selected as the measurement point.
The sensor should fit tightly on the metal wall to ensure that the transient ground wave signal can be accurately captured.
Signal acquisition:
The transient ground wave signal collected by the sensor is transmitted to the detection equipment for processing and analysis.
During the acquisition process, care should be taken to avoid the influence of other electromagnetic interference sources on the measurement results.
Data processing and analysis:
The detection equipment will filter and amplify the collected signals to improve the signal-to-noise ratio.
By analyzing the processed signal characteristics, such as the amplitude and frequency of the signal, it can be determined whether there is partial discharge inside the switch cabinet.
The longitudinal analysis method (comparing the test results of the same switch cabinet at different times) and the transverse analysis method (comparing the test results of the same switch cabinet in the same switch room) can also be used to evaluate the operating status of the switch cabinet.
III. Precautions
Detection cycle:
The live detection of transient ground wave partial discharge should be carried out regularly to ensure that potential discharge problems are discovered and handled in time.
The detection cycle should be determined based on the operating conditions and historical data of the equipment. It is usually recommended to conduct the test at least once a year.
Detection conditions:
When conducting live detection, it should be ensured that the equipment has been put into operation for a period of time (such as 30 minutes later) so that the equipment reaches a stable state.
Before the test, check that there is no other operation on the switch cabinet equipment, and the metal casing should be clean and reliably grounded.
Safety measures:
During the test, the safety operating procedures should be strictly followed to ensure the safety of personnel and equipment.
When abnormal conditions occur during thunderstorms or at the test site (such as abnormal sounds, voltage fluctuations, etc.), the test work should be stopped immediately and the site should be evacuated.
Interference elimination:
During the detection process, the influence of interference sources (such as gas discharge lamps, exhaust system motors, etc.) on the measurement results should be avoided as much as possible.
The influence of interference on the measurement results can be reduced by adjusting the sensor position, turning off the interference source, or using other interference suppression technologies.
IV. Application prospects
Transient ground wave partial discharge charged detection technology has broad application prospects in partial discharge detection of high-voltage switchgear and other equipment. With the continuous development and improvement of technology, the detection accuracy and reliability of this method will be further improved. At the same time, combined with advanced technologies such as artificial intelligence and big data technology, more intelligent monitoring and analysis can be achieved, providing more comprehensive and accurate data support for the operation and maintenance of power equipment.

In summary, transient ground wave partial discharge charged detection is an effective partial discharge detection method for high-voltage switchgear and other equipment. By reasonably setting sensors, collecting signals, and processing and analyzing data, potential discharge problems can be discovered and handled in a timely manner to ensure the normal operation and safety of power equipment.