Telecom Transformer products are widely used in cable modem, network card, hub, xDSL broadband communication equipment, switch, optical transceiver, router, embedded system, VoIP and other network communication equipment, data communication equipment, photoelectric transmission equipment, access network equipment, power line Internet equipment, voice equipment, etc

The audio transformer can realize voltage-converter conversion just like the power transformer, and can also realize audio signal coupling. There are four main functions of audio transformer:Output transformer: used in audio equipment and playback equipment, impedance conversion in the circuit.

Isolation transformer belongs to the safety power supply, generally used for machine repair, maintenance, protection, lightning protection, filtering function. The principle of isolation transformer is the same as that of ordinary transformer. They all use the principle of electromagnetic induction. Isolation transformers generally (but not all) refer to 1:1 transformers.

the structure of the power transformer:(1) Rectifier；(2) Filter；(3) Inverter；(4) Power factor correction:

The current transformer is flexible in the secondary time. You can also use soft cables to plug a pins. It can be installed with a fixed lead.

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

​The relay coil is represented in the circuit by a long box symbol, and if the relay has two coils, two long boxes are drawn side by side. At the same time, mark the relay word symbol "J" in or beside the long box. There are two ways to represent the contacts of relays: one is to draw them directly on one side of the long box, which is more intuitive. The other is to draw each contact into its own control circuit according to the needs of the circuit connection. Usually, the contact of the same relay and the coil side are marked with the same text symbol, and the contact group is numbered to show the difference.

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.

Electromagnetic Voltage Transformer (PT) and Capacitive Voltage Transformer (CVT) are widely used in power system. Although capacitive voltage transformers and electromagnetic current transformers commonly used in power grids have mature technology and long-term operation and maintenance experience, their measurement linearity is poor, the transient response speed is slow, and the transient error characteristics of electromagnetic current transformers are not ideal.

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.