The medium and high voltage current transformer is a kind of electrical equipment widely used in the power system. It is used to measure the current value in the power system and convert it into a standard voltage signal, so as to realize the purpose of power system monitoring and management. This article will introduce the principle, types, characteristics and applications of medium and high voltage current transformers.1. The principle of medium and high voltage current transformer The working principle of the medium and high voltage current transformer is based on the law of electromagnetic induction, that is, when a changing magnetic flux is passed through the circuit, an induced electromotive force will be generated in the circuit to measure the current in the circuit. In the medium and high voltage power system, the current transformer converts the current through the magnetic core into the desired voltage signal, and outputs it to the display or monitoring system to realize the monitoring and matching of the power system.2. Types of medium and high voltage current transformers Medium and high voltage current transformers can be classified according to their different design principles and application occasions, as follows: 1. Air core current transformer: usually used in local circuits, it has the characteristics of small size, light weight and simple installation. 2. Centroidal current transformer: It is suitable for medium and low voltage branch circuits and local current measurement in the power system, and has the characteristics of high precision, good linearity and strong stability. 3. Saturated current transformer: Its main feature is that there is a certain nonlinear effect and saturation phenomenon in the winding, which is suitable for high-precision current measurement and protection. 4. Volt-second current transformer: By adding a capacitive device in the winding structure of the transformer to filter and suppress high-frequency signals, it is suitable for the measurement of high-frequency pulse signals in power systems.3. Characteristics of medium and high voltage current transformers 1. Medium and high voltage current transformers have the characteristics of high precision, good linearity, and strong stability, and can reliably realize current measurement and monitoring of power systems. 2. Medium and high voltage current transformers also have the characteristics of small size, light weight, and convenient installation, and are suitable for occasions where the space for power equipment is limited. 3. It is suitable for the measurement of different current ranges, and can be customized as a current transformer for measuring DC current or pulse current. 4. Use environmentally friendly materials that meet international and domestic standards, non-toxic and harmless, and friendly to the environment.4. Application of medium and high voltage current transformers Medium and high voltage current transformers are widely used in power systems, mainly for the following occasions: 1. It is used to measure the current value in the power system and convert it into a standard voltage signal to realize the monitoring and management of the power system. 2. Used for power system protection, such as overload protection, short circuit protection, grounding protection and other functions. 3. Used for detection and maintenance of electrical equipment, such as measuring leakage current, local lightning protection and other parameters in electrical equipment. 4. Widely used in electrical detection and operation monitoring in ships, locomotives, airports, industrial and mining enterprises and other industries. In short, medium and high voltage current transformers are very important electrical equipment in power systems, with a wide range of applications and important functions. Through the principles, types, characteristics and applications of medium and high voltage current transformers introduced in this article, we can better understand and apply this equipment to achieve safe and reliable operation of power systems.
Post time: Jun-03-2023