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What are the similarities and differences of voltage and current transformers? The current transformer is called CT and the voltage transformer is called PT. What they have in common is that they work on the principle of electromagnetic induction, which is used to monitor the electrical circuit: the current of the electrical circuit is monitored through CT, which is the current source of secondary instrument and protection

​The ring indicates the number of primary and secondary windings of the voltage transformer. One primary winding is removed, and the rest are all secondary windings.

communication technology, sensor technology, electronic control technology, and computer technology to the entire transportation management system, thereby establishing a large -scale and comprehensive role, real -time in real time, in real time , Accurate and efficient comprehensive transportation and management system.

Tongue spring relay: a relay that opens, closes or converts the line with tongue spring action that is sealed in the tube and has the dual role of electric shock reed and arbit magnetic circuit

A relay is an electrical control device. It has a control system (also known as input loop) and a quilt The interaction between control systems (also known as output loops). Usually applied to the control of automation

Refers to the minimum current that the relay can generate the draw action. In normal use, the given current must be slightly greater than the draw current for the relay to be stable To work. The working voltage added to the coil, generally do not exceed 1.5 times of the rated working voltage, otherwise it will produce a large current and burn the coil.

Self-locking and interlocking are achieved by auxiliary contacts of relays. First of all, you need to understand what is called self-locking and what is called interlocking. Self-locking is to short off the button switch of the contactor coil loop with your own contacts, and make the coil loop open continuously after the button switch is released, which is self-locking.

The rise and development of intelligent power grid technology has put forward new requirements for voltage and current sensors in power system. Miniaturized non-contact sensors will be the mainstream and need. This paper summarizes the application status of traditional electromagnetic voltage transformers and capacitive voltage transformers, and points out their limitations. On the basis of introducing the D-dot measurement principle in high voltage pulse electrical measurement, an electronic voltage transformer based on self-integrating D-dot sensor is proposed, and it is pointed out that it will be the mainstream trend of voltage signal measurement in power system.

As an intelligent product developed by new technology, smart electricity meter can complete the contact function between users and smart grid. It not only has the function of human-computer interaction, but also has the basic function of electricity energy measurement, information transmission and remote status monitoring.