Knowledge

To measure a large DC current, such as tens of amperes, or even larger, hundreds of amperes, what should I do if there is no ammeter with such a large range to measure the current?

​Using the existing track-type terminal frame screw connection technology, and adding a circuit composed of electronic components, the transmission coupling of the photoelectric pr

Lamps and lighting: As an advocate of energy-saving lamps, various color energy-saving LED lamps are welcomed by the market, and aluminum-based PCBs for LED lamps have also begun t

LCD is a substance between solid state and liquid state. It cannot emit light by itself, and it needs an additional light source. Therefore, the number of lamps is related to the b

Because once the circuit is opened, the primary side current becomes the excitation current, which makes the magnetic flux and secondary side voltage greatly exceed the normal valu

For example, the current transformer suddenly cuts off the power supply under the condition of high current, and the secondary winding suddenly opens.

The wiring of the current transformer should follow the series connection principle: that is, the primary winding should be connected in series with the circuit under test, and the

Electromagnetic current transformer: a current transformer that realizes current transformation according to the principle of electromagnetic induction.

Rated capacity: the apparent power consumed when the rated secondary current passes through the secondary rated load. The rated capacity can be expressed by the apparent power V.A

​In the lines of power generation, substation, transmission, distribution and consumption, the current varies greatly, ranging from a few amperes to tens of thousands of amperes.

​A current transformer is an instrument that converts a large current on the primary side into a small current on the secondary side for measurement based on the principle of elect

Usually household meters are installed by the power department or developer, but there are places where a single-phase meter must be installed to measure residential or rental mete