Series resonance (also known as variable frequency series resonance test device) is widely used in industries such as power, metallurgy (content: extracting metals or metal compounds from ores), petroleum, chemical, etc. It is suitable for high-capacity, high-voltage capacitive test samples, such as generators, transformers (pressure transformers) GIS, Handover and preventive tests for high-voltage cross-linked cables, transformers, bushings, etc. Our company has developed independent innovative software engineering technology for frequency conversion and voltage regulation in the field of high-voltage testing research for frequency conversion series resonance, leading the domestic high-voltage testing data industry. With our information technology, we can use 16 bit fine frequency conversion, 10KHz carrier frequency, SPWM, and imported original IPM overall management module teaching design and manufacturing of a complete set of frequency conversion series parallel resonance testing and detection devices, which completely do not comply with the regulations and requirements of our country's high voltage experiments.
Communication voltage withstand test procedure
The stage of on-site communication withstand voltage test for geographic information systems is "complex purification", which aims to remove conductive or non-conductive particles that may exist inside the geographic information system. These particles may be due to metal fragments generated during the installation process that did not form a mesh, or the formation of chips or burrs and an electrode of a surface fastener during multiple operations. Experienced purification "can move conductive material particles to low electric field areas or particle traps to neutralize and ablate burrs on the surface of electrode structures, making them ineffective in insulation and causing harm to society." Complex purification "should be lower than the voltage value, preferably for a few minutes. The second stage is the withstand voltage performance test, which involves conducting an AC withstand voltage strength test for 1 minute after the "mature purification" process can be completed.
Judgment of on-site withstand voltage test results
(1) If each component of the geographic information system has undergone the specified test voltage according to the selected complete test procedure without breakdown discharge, the entire geographic information system is considered to have passed the test.
(2) If the comprehensive judgment of discharge breakdown occurs during the fault diagnosis testing period due to various discharge energies and discharge effects such as sound, light, electricity, chemistry, etc. provided by other technologies during discharge and pressure testing. In case of discharge development, the following steps can be taken:
Apply the specified voltage ①, repeat the test, or if the equipment can withstand a gas compartment, self discharge is a recovery discharge. If the working voltage can be repeated to reach the set value and the specified time, the test sample is considered qualified. Otherwise, proceed according to the following item.
② Disassemble the equipment, open the discharge gas barrier, and carefully inspect the insulation condition. The next prescribed pressure test can only be conducted after necessary recovery measures have been taken (refer to the solution to the problem) .
Method for locating breakdown faults in GIS withstand voltage test of frequency conversion series resonance test device
If GIS has multiple entrance and exit sections with discharge or non self-healing breakdown, it is difficult to determine the exact location (position) of faults and errors that are prone to occur during the pressure test that is listened to by the human ear alone, resulting in judgment and waste of manpower, material resources, and unnecessary damage to equipment during the testing process. If a fault locator developed based on the principle of generating shock waves during discharge and causing shell vibration waves is used at the construction site, the discharge time interval can be determined. Before each withstand voltage test, install sensors on the tested parts, especially on the connecting shells of circuit breakers, isolating switches, busbars, and insulators at the connection points of each interval. As a result of the limited number of sensors, if discharge breakdown occurs or it is not predicted based on the discharge monitor, the blood pressure sensor will continue until it finds the location of the boost discharge or breakdown and moves away.