Current transformer and voltage transformer are very important equipment in power system. Their main function is to convert high voltage and high current into voltage and current values suitable for instrument measurement or protection. Although they are both transformers, there are obvious differences between them.

1. Working principle

The current transformer is based on the principle of electromagnetic induction. It uses windings to convert a large current on the primary side into a small current on the secondary side, usually 5 amperes or 1 ampere, in order to measure and protect the equipment.

Voltage transformers are also based on the principle of electromagnetic induction, but they are used in high-voltage systems to convert high voltage to low voltage, usually 100 volts or less, for measurement and protection.

2. Application Scenarios

Current transformers are mainly used for current measurement and protection, for example in switchboards, power lines and electric motors. They are installed in the current path of power equipment to monitor the current state.

Voltage transformers are mainly used for voltage measurement, such as voltage monitoring and control in power grids. They are not directly connected to the high-voltage power supply, but are isolated from the high-voltage system by windings to ensure personnel safety.

3. Safety performance

The current transformer needs to bear large current when working, but its secondary side output is low voltage, and its structure design and use mode are to ensure the safety of personnel.

When dealing with high voltage, the voltage transformer needs to pay special attention to the safety performance. Since it is directly connected to the high-voltage system, its design and use must strictly comply with safety regulations to ensure the personal safety of operators.

In general, the role of current transformers and voltage transformers in power systems is to convert high voltage and large current into low voltage and small current suitable for measurement. But their working principles, application scenarios and security performance are different. Selection and use needs to be based on specific needs and conditions, and to ensure compliance with relevant safety standards and regulations. In addition, the installation, use and maintenance of these two transformers require professionals to ensure the safe and stable operation of the power system.