Technical
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Common parts of dry transformer short-circuit damage
Common parts of dry transformer short circuit damage: 1. The reason for the deformation of the corresponding part under the yoke is: (1) The magnetic field generated by the short-circuit current is enclosed by the oil and oil tank wall or iron core. Because the magnetic resistance of the yoke is ...Read more -
What are the applications of RLC series resonant circuits
In theory, R has no role in resonance. The resonant frequency depends on the values of inductance and capacitance. In practice, however, smaller ESRs and DCRS need to be considered for proper resonance. What exactly is resonance? It is the stage where the reactance of the inductor is equal to the...Read more -
Standard and test procedure for Tan Delta values
The dielectric loss value, also known as tan delta, is the residual Angle of the Angle between the current phasor and the voltage phasor flowing through the insulating material under the action of an electric field, which is commonly used to measure the internal energy loss of the insulating mate...Read more -
Importance of oil flash point determination
Flash point refers to the temperature at which a flash fire can occur on the oil surface when a flame is passed over the steam and air mixture escaped from the heated oil at certain intervals under specified heating conditions, expressed in °C. The flash point of the oil indicates the flammabilit...Read more -
Common failure and treatment about DC high voltage generator
DC high voltage generator common failure and treatment 1. Abnormal output voltage: it may be caused by a power failure, short circuit or open circuit of the output circuit. The treatment method includes checking the power supply to confirm whether the power supply is normal; Inspect output circui...Read more -
What tests can be done with the DC high voltage generator
1. Insulation resistance test Insulation resistance is the most basic insulation index of electrical equipment and circuits. When a DC voltage is applied to a dielectric, the resistance corresponding to the leakage current flowing through the dielectric after a certain period of time is called in...Read more -
How to use the ground resistance tester in a harsh environment?
In sandy and rocky soils with high soil resistivity, in order to meet the requirements of low grounding resistance, a grounding network composed of multiple grounding bodies connected in parallel is often used. But sometimes a large amount of steel is used, and the ground area is large. It is oft...Read more -
Common problems of dry-type transformers and oil-immersed transformers
1. What is a dry-type transformer? A dry-type transformer is a transformer that never uses any insulating liquid, and its windings or core are immersed in the liquid. Instead, the windings and core are kept in a sealed tank pressurized with air. 2. What are the uses of dry-type transformers? Dry ...Read more -
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 -
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