Advantages analysis and function of relay

Magnetic keep using magnetic principle to control the circuit relay is opened and a new type of relay, cutting off their normally open or normally closed state completely from the role of permanent magnets, with a certain width of pulse electrical signal trigger finishes the transformation of switch state, with low power consumption, high sensitivity, small volume and touch the contacts as well as good stability, widely used in the field of aviation, satellite, etc. relay is to introduce the internal rare earth magnetic steel into the magnetic circuit, so that it has a strong ability, which can be operated under the action of pulse. And in the case of no power consumption to maintain in a certain position for a long time, that is, to maintain the state of the last pulse instruction, with memory and bistable functions.

An example of a relay

relay is mainly used in IC card prepaid meter, centralized meter reading system. In recent years, relays have been widely used in composite switches of reactive power compensation devices. When used in combination with SCR in composite switches, they have become the main switching devices in reactive power compensation devices to switch large current circuits. They can also be used in a variety of household appliances and automatic control devices (such as lighting control systems). 

The relay industry has penetrated into all aspects of life

With the continuous development of science and technology, magnetic stick relay also obtained fast development, magnetic relay is developed in recent years, a new type of relay, has, magnetic high efficiency, small size, simple structure, convenient assembly, etc, used in satellites, missiles, spacecraft, aircraft and other equipment of the relay.

Magnetic latch relay industry to the sophisticated market

With the development of electronic technology, the number of electronic equipment used in modern automobile is increasing, and the environment of magnetic latching relay is becoming more complex, which requires the magnetic latching relay to have good electromagnetic compatibility in this environment. Due to the rapid development of the automobile industry, the demand for automotive relays has risen sharply, and the manufacturers of magnetic latching relays have sprung up like bamboo shoots after a spring rain. The huge market opportunities attract "princes" from all over the country to seize the market one after another, and the magnetic latching relays have a broad development prospect in the market. 

relays drive new consumer demand

With the improvement of living standard, people more and more high to the requirement of electric, magnetic relay is an important role in field application of automatic control, in recent years the increasingly fierce market competition, each relay enterprises are launched the latest version of differentiated products, especially the emergence of high-tech advanced technical performance index of the product, more to relay provides a broad stage.

Wiring diagram of current transformer

Wiring diagram of current transformer Before the wiring diagram of the current transformer, let's take the ratio of the current transformer 200A to 5A as an example: the current flowing through 200A once, the current flowing through 5A twice is corresponding to the current flowing through 5A, and its "current changing ratio" is 200÷5 = 40 (times). For this reason, the actual electricity consumption of the watt-hour meter is defined as the amount of electricity read by the meter (current month minus last month) ×40. Wiring diagram of ammeter and transformer on the distribution cabinet is as follows: 1. The above diagram is the wiring diagram of three current transformers; 2. The following diagram is the wiring diagram of two current transformers. Ia+Ib+Ic=0 So: Ia+Ic=-Ib So: The green ammeter indicates the B-phase current. The three-phase four-wire active watt-hour meter connected by current transformer shares the connection mode of voltage line and current line, which is quite a few in agricultural electricity metering. In this method, three voltage leads are eliminated, and the current transformer K1 is connected to the power supply L1. Through the current secondary line, the voltage pile head of the electricity hour meter and the current pile head are connected in a continuous way. This connection method aims to reduce the number of secondary wiring roots. However, this method is very dangerous: first, the secondary circuit of the current transformer should not be grounded, otherwise, it will cause a short circuit and burn out the electricity meter. However, the regulations stipulate that the secondary loop of the transformer must be grounded at some point. Second, because the voltage and current terminals of the electricity hour meter and the secondary circuit of the transformer are all with 380/220V voltage, we should always pay attention to avoid accidental touch in the live work. Third, the zero line connected to the watt-hour meter should not be mistaken or replaced with any other one, otherwise the current coil of the watt-hour meter will burn out due to short circuit, and the current transformer will increase the circuit impedance infinitely and tend to open circuit due to the connection of the secondary circuit to the voltage coil of the watt-hour meter. All these are very dangerous.