Industry News

More than 10 cities in China have approved commercial trials of autonomous vehicles, inclusive of taxis and urban buses, in designated areas and specific period of time, a senior official announced on Thursday. The application scale of autonomous vehicles is expanding thanks to the rapid development of new technologies such as artificial intelligence, 5G and big data, Han Jinghua, deputy director of the Ministry of Transport's Transportation Services Department, told a news conference.

The wiring of the current transformer should follow the series principle: that is, the primary winding should be connected in series with the circuit under test, while the secondary winding should be connected in series with all instrument loads.

If the main wiring is single busbar, single busbar segment, double busbar, etc., install three-phase voltage transformer on the busbar; when there is power on its outlet, it needs to be reclosed to check the synchronization or no voltage, and it needs to be parallel in the same period. Single-phase or two-phase voltage transformers should be installed on the line side.

Thermal Reed Relay is a new type of thermal switch that uses thermal magnetic material to detect and control temperature.

In essence, electrical components all have inductive components, but in different scenarios, the main characteristics displayed are different. We only say which is a resistive component and which contains an inductive component, mainly considering two factors.

The shunt conductor is a three-dimensional entity. Under the action of high-frequency current, the distribution of the current in the conductor obviously shows a skin effect, and most of the current flows on the surface of the conductor.

The models of low voltage current transformers are LMZ1-0.5, LMZ1-0.66, LMZJ1-0.5, LMK-0.66, BH-0.66, SDH-0.66 and so on. There are also some special enterprise models, such as ALH-0.66, AKH-0.66 and so on.

The shunt is used to measure DC current, and it is made according to the principle that a voltage is generated across the resistor when the DC current passes through a resistor with a small resistance value.

The initial resistance deviation of the resistor is familiar to everyone. Like the commonly used thick film resistors (such as 0603 package), the general accuracy is 1% or 5%. It refers to the resistance deviation at room temperature, and the initial resistance deviation is fixed after leaving the factory. For example, the nominal resistance is 100Ω, the actual measurement is 101Ω at room temperature, and the initial deviation is 1%.

What is a shunt resistor? A shunt resistor is a resistor with a small resistance value for measuring DC current. It is made according to the principle of a voltage drop across the resistor when the DC current passes through the resistor, and converts the current signal into a voltage signal for DC current detection.