Basic technical requirements for power relays

Since the power relay plays a very important role in the automation system, its quality, technical performance and economic indicators must be related to the speed of economic construction and the safety of workers, so it must be put forward some basic. requirements.

The technical performance requirements are:

(1) Reliable work: For example, for a medium-capacity switch, there are hundreds or thousands of docking points participating in the work every time a call is made. As long as one of the docking points fails, the call cannot be connected this time. If the relay in the control system of the steelmaking furnace does not work properly, it will bring about a furnace shutdown accident and cause great economic losses. If the power relay in the control parts such as aircraft and missiles work unreliably, it will cause serious consequences. Therefore, for any relay, no matter what occasion it is used in (by land

Whether it is the ocean, the ground or the air, the tropics or the frigid zone, the working environment is good or bad - humidity, high temperature, vibration, shock, etc.), it must work reliably.

(2) Sensitive action: The relay has different requirements for its action sensitivity according to different usage requirements. There are general power relay with low requirements, and high-sensitivity power relay with high requirements. But when designing and manufacturing power relay, it is always desirable to have high sensitivity after other conditions are met.

(3) Stable performance: Sometimes the performance of the relay meets the requirements when it leaves the factory or in the early stage of use, but after a period of storage or use, its performance changes greatly, which is not allowed. The relay must be required to maintain stable performance over the specified service life.

(4) Small size, light weight, long life, small impact on surrounding components and devices, etc. Simple structure, convenient manufacturing, good manufacturability and low cost are required in production and manufacturing. It requires convenient maintenance and repair in use.

Of course, these requirements are not absolute. For a specific product, it should be analyzed according to its function and use of the field, and strive to improve other performances on the premise of ensuring that the main performance is met. Obviously, the reliability, stability and rationality of relay work are determined on the one hand by the quality of the product, on the other hand, by the correctness of use and the seriousness of maintenance. Only by guaranteeing the product quality and correct use can the system work properly. In order to do this, it is important that everyone who is engaged in the manufacture and use of electrical appliances should understand its basic working principles and master its common characteristics and laws. In this way, people's subjective initiative can be brought into full play, so that the relay can better serve social progress.