Technical
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What the meanning about series resonance flashover protection
“Flashover” may be mentioned in different applications, such as the flashover protection of circuit breakers? Insulating oil flashover protection? Flashover refers to the phenomenon of discharge along the surface of the solid insulator when the gas or liquid dielectric around the soli...Read more -
How to prevent oil-immersed transformers from leaking
Prevent Oil Leakage of Oil-immersed Transformer The oil-immersed transformer oil tank is filled with transformer oil, and the oil-resistant rubber parts are pressurized and sealed by fasteners during assembly. Lack of sealing is the main reason for oil leakage of oil-immersed transformers, so spe...Read more -
How to Measure PD (Partial Discharge)
? Various methods are used to detect PD, including detection of sound, light, and radio frequency (RF) signals. Typically an alternating current (AC) hipot test with capacitive coupling is used. This article focuses on PD detection using surge testing. This newer method is becoming popular and is...Read more -
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Fault Analysis of Oil-immersed Transformer
Oil-immersed transformer weld seam oil leakage The main reason is that the welding quality of the oil-immersed transformer is poor. The welds of oil-immersed transformers have defects such as false welding, desoldering, pinholes and air bubbles. It was covered by flux and paint when leaving the f...Read more -
Meaning of test terms in circuit breaker dynamic characteristic tester
During the use of the circuit breaker dynamic characteristic tester, electric workers will use some professional terms to describe the test results or test process. So, what does the test term mean when testing circuit breakers? The following article introduces it to you. ? ? ? ? ? ? ? ? ? ? ? ?...Read more -
What are the components of the insulating boots (gloves) hipot test set?
Insulating boots and gloves withstand voltage test device is one of the commonly used safety testing equipment in electrical engineering. It is mainly used to measure the withstand voltage performance of insulating devices such as insulating gloves and insulating boots to ensure the safety of ele...Read more -
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Why test the dielectric strength of insulating oil?
The main reason for testing the dielectric strength of insulating oil is that the dielectric strength of insulating oil is an important index reflecting the quality of insulating oil, and this index can directly reflect the withstand voltage capability of insulating oil. The dielectric strength o...Read more -
What are the requirements for DC resistance tester to detect power transformers
For power transformers with a voltage level of 10KV and below, the detection requirements in the winding DC resistance test item are: the transformer is 1.6MVA and below, and the requirements for phase-to-phase difference regulations: it should not be greater than 4% of the average value of the t...Read more -
Common problems and solutions in transformer high voltage test
In the high-voltage test of transformers, many key points should be paid attention to, and the test conditions and test methods must be accurately grasped. The faults that occur in the high voltage test of the transformer should be screened one by one, and the faults should be properly handled. E...Read more -
Common troubleshooting methods of Capacitance and Tan Delta tester
It is inevitable that the test data of the high-voltage dielectric loss tester will be obviously unreasonable during use. Once this positive problem occurs, the reason can be found from the following aspects: 1. Poor contact of the hook When using a hook to connect the test object for on-site mea...Read more -
Electrical safety common sense training
Electrical equipment will not endanger human health and surrounding equipment during normal operation and under expected abnormal conditions. When electrical equipment fails unexpectedly, it should be able to cut off the power supply and limit the accident within the allowable range. If electrica...Read more -
Measuring principle of transformer on-line monitoring
One of the effective methods for on-line detection of transformer insulation is to monitor the parameters of partial discharge electric pulses. In the normal operation of the transformer, the partial discharge is small. In recent years, the partial discharge of the transformers above 110kV produc...Read more