Electrical control is a method of automatic or remote control of mechanical equipment using the structure and characteristics of various electrical components. According to external signals and requirements, electrical components use manual or automatic disconnection of the circuit, and intermittent or continuous change of electrical parameters, to realize the switching, control, protection, detection, and adjustment of circuits or non-electrical objects. This article tells you what is a time relay. How do time protection relays work? What are the types of time relays? What are the rules to be followed when choosing a time relay?
What is a time relay?
The working principle of the time relay is mechanical. The time relay is a very important component in the electrical control system. In many control systems, it is necessary to use the time relay to realize the delay control. The time relay is an automatic control device that uses the principle of electromagnetic or mechanical action to delay the closing or breaking of contacts. Its characteristic is that there is a delay between the time when the attracting coil gets the signal and the action of the contact. Time relays are generally used for motor starting process control which is a function of time.
How do time protection relays work?
Time relay refers to a kind of relay whose output circuit needs to go through the specified accurate time to produce a jumping change (or contact action) after adding (or removing) the input action signal. It is an electrical component used in a circuit with a lower voltage or a smaller current to switch on or off a circuit with a higher voltage and a larger current.
There are many types of time relays, mainly including air damping type, electromagnetic type, electric type, and electronic type.
①The air damping time relay is also called the airbag time relay. It delays time according to the resistance generated by air compression. Low.
② Electromagnetic time relay has a short delay time (0.3~1.6s), but its structure is relatively simple, and it is usually used in power-off delay occasions and DC circuits.
③The principle of the electric time relay is similar to that of a clock. It is delayed by the rotation of the reduction gear driven by the internal motor. This kind of relay has high delay accuracy and a wide delay range (0.4~72h), but the structure is relatively complicated and the price is very expensive.
④The electronic time relay is also called the electronic time relay, which uses a delay circuit to delay time. This relay has high precision and a small size.
3 rules to be followed in selecting a time relay
①According to the needs of the controlled circuit, it is decided to choose whether the time relay is a power-on delay type or a power-off delay type.
② Select the voltage of the time relay to attract the winding according to the voltage of the controlled circuit.
③If the time delay requirement is high, you can choose a transistor-type time relay or an electric time relay; if the time delay requirement is not high, you can choose an air-damping time relay.
Naidian Group Co., LTD. is the only company that has CCC certificate for the protective relay. All our products have passed CCC, CE, UL, and so on. The group has built a reasonable production and operation pattern at home and abroad, has a first-class product monitoring system and quality control system, in the national low-voltage industry has obtained ISO9001 quality management system and ISO14001 environmental management system international and domestic two-factor certification, and provides efficient, high-quality distribution and industrial control solutions.