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Founded in 2005, Dongguan Yinyin Hardware Products Co., Ltd. specializes in: silver contacts, electrical contacts, double composite silver nails, riveted silver contacts, soldered silver contacts, various precision stampings, conductive copper posts, contacts Screws, electrical screws, DC, AC pins, copper sleeves, such as hollow needles, semi-hollow needles, four guides, rivets, silver dots, binding posts, AV copper sleeves, 3F07 copper sleeves, 3F05 copper sleeves, 215 copper sleeves Etc., and the production of various silver, copper, iron, aluminum, non-show steel and other heterosexual products, electricity, mobile phone 13728192869, Mr. Chen
Thanks to the manufacturer of professional silver contacts (in-mold riveting parts), stamping parts, low-voltage switches (wall switches, leakage switches, etc.) that focus on "safety electricity, safety switches, safety electricians"! Thank you for your attention! ! Committed to providing users with the most comprehensive safety power detail service!
1, contact protection
When inductive loads such as motors, transformers, clutches, and solenoids are cut, hundreds or even thousands of volts are often applied across the contacts, which can significantly shorten contact life. In addition, the current below 1A generated by the inductive load can cause spark discharge, which will decompose organic matter in the air and blacken the contact carbonization (oxidation or carbonization), which will also lead to poor contact of the contacts. The main reason for the counter voltage generated here is that the energy 1/2 Li 2 stored in the inductance in the coil when the inductive load is cut off is expressed by the discharge of the contact, and the counter voltage is t=-L.Di/Dt. Generally, the critical breakdown voltage of air under normal temperature and humidity conditions is 200~300V, that is, when the reverse voltage is higher than this value, air field breakdown will be caused. However, if the counter voltage absorbing portion is made smaller than 200V, field breakdown does not occur. Breakpoints continue to be transmitted, and designing a protection circuit like the one shown in Figure 57 is very useful in practical use.
The method is the precautions in the use of the RC circuit, the diode method, and the parallel connection of the variable resistor. When the contact protection circuit is used, the release time will become longer. This reminds the user to pay attention to the use, and the components of the protection circuit are not used. When combined, the load should be mounted close to the contact side.
2, load type and surge current
The type of load and the inrush current characteristics are related to the switching frequency, which is one of the reasons why contacts are prone to fusion. In particular, the surge has a great influence. This must be fully considered when selecting the relay. The margin that the contact can carry gives the current waveform under different loads and the relationship with the time variable, which has certain reference value.
3, contact transfer
The so-called contact transfer phenomenon means that when a switch of a DC load circuit is switched, a contact on one side of a contact is evaporated and then volatilized (splashed) onto the other contact, so that a contact surface on one side of the contact point is concave. The other side of the contact surface is convex, this is what we call it contact transfer.
The degree of transfer is aggravated by the increase of the frequency of contact opening and closing. Especially when the DC inductive load is turned off, due to the generation of overvoltage, a surge current of 2A to 10 can be generated, thereby causing arc discharge at the contact. Or sparks. In this case, the necessary contact protection circuit can be used in this circuit, and contact materials that are not suitable for transfer such as AgW, AgCu, etc. are used to reduce the degree of this transfer phenomenon.
When the DC circuit is opened and closed, the contact material transfer is generally convex on one side and concave on the + side. Therefore, it is necessary to determine the practical contact protection circuit when opening and closing the DC large-capacity load as the number A to the number 10A.
4. High-frequency open and close DC loads can cause abnormal electrical corrosion of contacts.
In the case of high-frequency breaking of the DC tube and the clutch, the contact produces a cyan light. This spark when the contacts are opened and closed combines with N 2 and H 2 O (water vapor) in the air to produce a chemical action, which causes the contact protection circuit to lose the spark-suppressing ability, thereby greatly increasing the damage of the contacts. Therefore, this situation must be brought to the attention of the user.
5, the contact switch should be placed on the AC side of the circuit
In general, for the same load, it is easier to break the AC than to cut the DC. In other words, the AC load can be cut off more than the DC load vacancy for the same switch. This is because there is a zero-crossing in communication. When the AC current crosses zero, the power of the input contact is actually zero, and the energy that naturally generates the arc is also zero. This reduces the arc burning time to a considerable extent, and naturally reduces the corrosion loss of the contacts. Therefore, when the same load is interrupted, AC is easier than DC.
6, the wiring method of the switch contacts on the load
The connection between the load and the relay should be connected to the power supply.
That is, one side of the contact is all connected to the potential to prevent a high voltage from occurring between the contacts, and the two contacts that are relatively close to each other will short-circuit and the power supply may be discharged.
7, other circuit connections that should not be used
(1). Short circuit between contacts
(2). Motor forward and reverse running circuit When the motor is running, the reverse rotation will cause arcing between the relay contacts, which will cause ionization of the air around the contacts, causing short circuit of the power supply and also causing damage to the contacts. Waiting for a vicious accident.
(3). Alternate switching of different power supply voltages When the contacts of relay R are used to alternately switch the power supplies of different voltages, although the starting time is short, it is easy to cause contact burns and easily cause short-circuit accidents of different kinds of power supplies. Multiple switches to switch. The above-mentioned undesirable phenomenon does not occur.
(4). Method of load separation
When the load is shared by the two switching circuits, the lightning current is easily burned through the lower contact. For this reason, it is beneficial if the total separation is for the protective contact.
8, leakage resistance
In extremely small current loops (commonly referred to as dry current circuits), the contact voltage is extremely low, which can cause poor contact when the contacts are turned on.
For this reason, a leakage resistor is often connected in parallel with the load. This method can improve the reliability of the contact at 0.1V, 0.1mA.
Relays with double sub-contacts are often used in the following circuits, and the materials used for the contacts of the relays should be noted at this time.
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