The causes of circuit breaker tripping include overload, short circuit, leakage, undervoltage or overvoltage. If the current in the line exceeds the range that the circuit breaker
Nov 07, 2022
The iron loss of transformer is determined by the magnetic flux density in the iron core, and the copper loss is determined by the current in the winding In case of no load and sho
Nov 06, 2022
1. The magnitude of the current varies. The size of AC current varies periodically, while the size of DC current is fixed and will not change. 2. Different uses of current. AC powe
Nov 05, 2022
After mineral insulating oil is oxidized under the action of temperature and oxygen, it will produce CO and CO2, as well as acid and sludge. This process is generally referred to a
Nov 03, 2022
Gas chromatography refers to the chromatographic analysis method in which the mobile phase is gas. Gas and volatile liquid or solid samples can be separated and determined by gas c
Nov 02, 2022
1. Fuel There should be no suspense, and it consumes most of the oil. 72% of the oil is used to make various fuels: diesel oil and gasoline on automobiles, and fuel used by aircraf
Nov 01, 2022
Oct 28, 2022
It is applicable to chemical, biological and physical laboratories that need to work under low temperature and constant temperature. Before using the low temperature thermostatic b
Oct 27, 2022
(1) Measure the insulation resistance. a. Voltage above 35kV: use a 5000V megger, and the insulation resistance is not less than 2500M Ω; b. Voltage of 35kV and below: 2500V trameg
Oct 26, 2022
1. Scope This standard specifies the test method for evaluating the copper corrosion degree of petroleum products. This standard is applicable to the determination of motor gasolin
Oct 25, 2022
The periodic tests of high-voltage test transformers include: ① Oil sample detection - withstand voltage, impurities and other performance indicators shall be conducted once every
Oct 23, 2022
The transformer will inevitably suffer from the impact of various short-circuit fault currents during operation, especially the outlet short circuit and near field short circuit, w
Oct 22, 2022
