What Is Relay Protection And Overcurrent Protection?

       Relay protection is a very important test in power system testing. It can detect the faults or abnormal conditions in the power system, so as to send out an alarm signal, or an important measure to directly isolate and remove the fault part. The instrument commonly used in relay protection work is a microcomputer relay protection tester.

       In the development process, it used relays with contacts to protect the power system and its components (generators, transformers, transmission lines, etc.) from damage, so it is also called relay protection.

       There are also many types of relay protection, including current protection, distance protection, differential protection, longitudinal protection, gas protection, etc. What does over-current protection look like?

       Over-current protection is a protection method that causes the protection device to operate when the current exceeds a predetermined peak value. It mainly includes two types of short circuit protection and overload protection. Short circuit protection has the characteristics of large setting current and instantaneous action. The characteristics of overload protection are mainly reflected in its small setting current and inverse time limit action.

       Electromagnetic current releases (relays) and fuses in short-circuit protection are often used as short-circuit protection components. Time-delay electromagnetic current relays in overload protection are often used as overload protection components.

       Overcurrent protection can handle different types of faults in sections and situations. Overcurrent protection switches are set at each stage to selectively cut off part of the line according to the current size, location, duration, etc. Actually, it is operated by three characteristics: inverse time characteristic, definite time characteristic, and quick break characteristic.

       Combining these three types and installing them reasonably in different locations, it is possible to divide the current, time and section into line protection.

       In addition to the different methods of relay protection, the computer-based relay protection tester is also different. The tester also has three types: multi-function type, comprehensive type and ordinary type. The functional characteristics between them are different, and the tests implemented are also different. It is mainly developed based on different actual test items, so that consumers can choose their own computer-based relay protection tester in many ways.

       GDZX is a professional manufacturer of relay protection devices. Any interest, you can visit GDZX’s official website: http://en.gdzxdl.com/