The vacuum circuit breaker adopts a vacuum arc extinguishing chamber, and the dynamic and static contacts in the vacuum arc extinguishing chamber adopt flat butt contact. In order to ensure good contact between the dynamic and static contacts, sufficient contact pressure must be ensured; During the closing process of the…

One of the main differences between CT and PT transformers is their functionality.On the one hand, current transformers can reduce high currents to a safer and easier to manage level for you to measure. It converts large primary currents into small 1A/5A currents, which can be measured on an ammeter.On…

Cable withstand voltage test is a method of detecting faults in the presence of cables. During the testing process, it is susceptible to various factors, leading to problems such as faults and short circuits. Below are several main methods for cable withstand voltage testing.1、 Super low frequency withstand voltage testThe…

Vacuum circuit breakers are indoor distribution devices in a 3~10kV, 50Hz three-phase AC system. Its main function is to control and protect current and voltage in medium and high voltage transmission lines. It can be used for the protection and control of electrical equipment in industrial and mining enterprises, power…

High voltage testing is a dangerous task that requires preventive measures to ensure safety during the testing process. Here are some common preventive measures:1. Choose a suitable testing locationThe testing location should be in an area that is relatively quiet, unobstructed, well ventilated, well lit, and able to isolate personnel…

Power transformers are the core of all modern power systems. Without electricity, the world cannot operate, and without transformers, the power system cannot be imagined.Do you know what the core of these transformers is?Yes, you guessed it right! It is the winding of a transformer, without which the transformer cannot…

Grounding rods, discharge rods, and brake rods are all types of safety tools. The grounding rod is a part of the grounding wire. The conductor is buried underground and the ground discharge rod is suitable for outdoor high-voltage testing, especially after conducting DC withstand voltage testing, using the grounding rod…

What are the troubleshooting methods for circuit resistance testers?1. Fault phenomenon: the circuit resistance tester is connected to the 220V AC power supply, and the fan has no running sound. Press the "test switch", and the Ammeter and micro ohmmeter have no display.Reason: 220V AC power supply blocked, fuse not…

When conducting AC withstand voltage tests on high-voltage and high-capacity equipment, the capacity requirements of the test transformer are very high, and the test equipment is bulky. However, the application of series resonance principle can utilize equipment with much smaller voltage and capacity to generate the required test voltage, meeting…

The no-load current of transformers is determined by impedance. If the performance and quality of silicon steel sheets are poor, or if the manufacturing process of the iron core is poor, the laminations are uneven, the joints are too large, and the clamping force is too small or too large,…