Under the action of the alternating electric field generated by alternating current, insulating oil theoretically only passes through a weak capacitive current inside the medium, which is 90 ° ahead of the phase of the applied voltage, only affecting the power factor of electrical equipment without generating power loss. But…

The concept of five defenses1. Prevent closing the isolation switch with load.2. Prevent accidental opening and closing of circuit breakers.3. Prevent the grounding switch from closing with load.4. Prevent the load from being sent out when the grounding switch is closed.5. Prevent accidental entry into the charged area.The five prevention…

The use of a DC high-voltage generator for DC leakage testing is a comprehensive analysis of the insulation quality of the tested product based on the magnitude of the leakage current, the changes in leakage current during continuous boosting, and the stability of the leakage current during boosting. DC withstand…

When the internal medium of a cable experiences a fracture fault, the exact location cannot be seen when it is wrapped with insulation skin, including strong and weak currents. The usual approach to finding a breakpoint is to investigate it in sections. So what are the commonly used methods for…

There are two main reasons for the failure of lightning arresters:Reason 1: Poor sealingCommon lightning protection devices are mainly used to prevent damage to electrical equipment in substations caused by lightning waves. It not only has excellent nonlinear volt-ampere characteristics, but also has characteristics such as low cost, no gap,…

The grounding resistance tester for the grounding grid is an important component of ensuring the safe operation of electrical equipment, but in practical use, we may encounter situations where the grounding grid resistance value is too high. Next, we will introduce the reasons for this situation and provide some solutions.1.…

KST-215 insulation oil gas chromatography analyzer is a technology for separating and analyzing multi-component mixtures. It mainly utilizes the differences in boiling points, polarity, and adsorption coefficients of each component in the sample in the chromatographic column to separate each component in the column, and conducts qualitative and quantitative analysis…

In recent years, with the development of China's power system, the requirements for testing various components in the power system have become increasingly high. The test transformer is required to have strong insulation performance, low leakage flux, good heat dissipation performance, and high voltage resistance. Dry type test transformers have…

The main equipment required for AC voltage withstand test are:Test transformers, voltage regulation and control equipment, voltage measurement devices, protective resistors, and protective ball gaps. Precautions1、Before the AC voltage withstand test, the external insulation surface of the tested object should be wiped clean. For oil filled equipment, the oil should be…

In the field of our power industry, in order to reduce the reactive power loss of the power system, the method of parallel capacitor banks can usually be used to improve the power factor. In actual operation and application, the accident rate of the capacitor compensation device is relatively high,…