What are the primary working methodologies of the overload relay?
The overload relay is an electronic device that turns OFF the motor or the heater automatically when there is an overload. The overload relay turns OFF the engine when a higher voltage is applied; this is more than the suited voltage of the motor pump. The application of the overload relay can prevent the coil inside the motor from getting burnt due to the higher voltage.
Many people are in a big misconception that it is normal for the motor pump coil to get burnt with time. Each rewind of the overload relay can cost up to 7000 – 10000 INR, and hence it is difficult to change the coil of the overload relay regularly.
The burning of the coil can easily be prevented by applying an overload relay, which can turn-OFF the motor when it senses a massive electrical voltage input than usual.
The advantages of using the overload relay
- The overload relay can ensure that the motor is safe and runs for longer life and can also protect the engine from any potential damage.
- The overload relay can also prevent the loss, which can occur due to the breakdown of the water pump.
- The overload relay can protect the motor from being damaged, and hence all the people can save on their yearly budget by minimizing the cost of maintenance and repairs which they spend every year on the motor.
- As the overload relay protects the motor from variant flaws, it is evident that it increases the life-span of the engine.
What are the major types of overload relay?
There are two types of overload relay
- Thermal overload relay and
- Digital overload relay
The thermal overload relay trip off the motor when a higher temperature is observed, which is higher than the average temperature.
The digital overload relay monitors the input voltage and current through a digital meter and hence trip off the motor when the voltage value exceeds the average value.
The thermal overload relays were a popular choice of vendors for a more extended period. The only problem with the thermal overload relay is they are climate dependent. On the other digital overload relay does not provide any room to the factors, and hence they can be considered as a good option for modern motors.
How can hybrid relays only all the complications?
The hybrid relay uses the application of the static and mechanical relay, which are also termed as an electromechanical relay (EMR) and the solid-state relay (SSR). Philosophically, the hybrid relay creates a fruitful relationship between the low voltage drop and high reliability of the silicon semiconductors. Some of the significant applications of the hybrid relay include heater set-up and motor starters in the home.
One of the most critical challenges for the entire industrialist is to control the hybrid, and hence it is not easy that it seems from the term. Due to the occurrence of the voltage spikes between the mechanical switch and the silicon switch can create some electromagnetic noise emission. We have brought some of the best techniques in the article, which can help the users of the hybrid relays in preventing the voltage spikes.
How to control the voltage-spikes in the hybrid relay?
The people who select AC switch for the solid-state relay and electromechanical relay have their positives and negatives on the side. The solid-state relay can perform the reaction at a rapid pace, and there is no voltage bounce during the ON period, and no sparks arise during the turn OFF period. The leading cause is the EMI and the shorter-relay time in the solid-state relay. The electromechanical relay can make sure that there is no conduction loss in the entire process. The electromechanical relay also prevents the heat sink for the applications over 2A RMS. The electromechanical relay also establishes an insulation terminal between the driving coil and the power terminals of the relay. The insulation between the driving coil and the power terminal make sure that it renders the SCR or the silicon controlled rectifiers.
What is zero-voltage switching?
Many experts believe the fact that switching the electromechanical relays a close to zero voltage can provide them a longer life. The electromechanical relays can also tend to live longer when the whole switching process occurs at DC or DC voltage.
The switching on at the zero-voltage also increases the in-rush current, which can decrease the capacitive loads, which includes the electrical lamps, fluorescent tubes, and inverters. The switching on at the zero-voltage can also increase the life of the capacitor and can also regulate the recurrent voltage fluctuations inside the electrical appliance.
What is the need for hybrid relay switching in the market?
Most of the people related to the electric field would have much in-depth knowledge about the two most significant types of relays which are
- EMR or electromechanical relay and
- SSR or solid-state relay
The ultimate comparison EMR Vs. SSR
Both electromechanical relay and the solid-state relay have merits and demerits on their side, but what’s more important is which among the two is best. Some people hold the bottom of SSR as it is more reliable as the electromechanical relay produces arcs and loses its reliability. On the other hand, some people say that SSR provides heat losses, and EMR is much more convenient and cheaper when compared with the SSR. The SSR also does not use any moving devices, which is the leading cause of its reliability. Both SSR and EMR can work either on AC or DC based on the situation.
The solid-state relay waste a lot of power as it drops down the voltage when the electric signals pass through the semiconductor channel. For example, the SSR can consume 15 watts or more than that for giving a 10 A of electrical load.
What are hybrid relay switching and its significant applications in the market?
By comparing the EMR and SSR, we conclude that both are good at some points and also hold an equal amount of negatives on the other. The best solution to make the best relay is creating a hybrid of EMR and SSR, which can offer both the features and hence increase the standard of the circuit.
To bring the right solution for all the problems, the Echola systems have brought PDUs types of relays, which make use of both electromechanical relay (EMR) and solid-state relay (SSR) and hence it successfully eliminates the cons of duo comprehensively.
The hybrid form of relay or PDU holds a parallel setup of the circuit of EMR and SSR. The SSR output switches the load when the signal is applied. On the other hand, the EMR establishes a parallel path for signal transport. Due to this operation, no-heat or small heat traces are produced in the SSR. As the SSR holds the initial load, the EMR does not have to transfer the entire amount, and hence the process can be completed in such a quick time.
What are a solid-state relay and the basics of the solid-state relay?
In a simple language, the solid-state relay is used for switching an electrical signal without the incorporation of any physical device. Due to the unavailability of moving physical components, the solid-state relays tend to have a longer life than their alternated electromechanical relay. The solid-state relays are also faster magnitude than the electromechanical relay. We will be looking at the entire composition which designs the solid-state relay.
The solid-state relay is right now facing a shortage in the market due to their demand in all the industries from agriculture to aerospace. Many experts also convey that the solid-state relays have the revolutionizing power of changing the performance of the electrical industry in the future. Having heard about so many positives about the solid-state relay, most of the people might be eager to know about the composition of the solid-state relay. We have brought here all the information which surfers need regarding the solid-state relay.
The complete guide and details related to the design of the solid-state relay
The solid-state relays are designed simply with the switch ON and switch OFF terminal with two terminals termed as power and load terminal. The relay switches between the ON and OFF terminal when an electrical signal passes through the entire circuit of the solid-state relay. The switching in the solid-state relay happens swiftly, and hence the power is extracted from a power transistor. The industrialist can design the relay either on AC or DC based on their requirement or application. The solid-state relays can offer high current potential, which can extend up to hundreds of ampere. The two transistors in the relay set up switch ON and OFF simultaneously to regulate the transport of the signal inside the SSR circuit.
How does the solid-state relay work?
The real beauty and the secret of the success of solid-state relays over the electromechanical relays lies on the switching mechanism of the SSR. The solid-state relays use the industrial opto-isolators or the optocouplers. The LED light shines on low power, which indicates the completion of the circuit when a high-power electrical signal passes through the frame of the solid-state relay, which means switch ON. The photodiode present in the solid state relay is responsible for the completion of the circuit.
What are a solid-state relay and the major applications of the solid-state relay?
The solid-state relay or commonly known as the SSR is an electronic switch when the small external electrical voltage passes through the terminals of the SSR. The relay can be designed for the intended purpose like AC or DC based on the requirement. The functions of the solid-state relay are precisely the same as the electromechanical relay, and the only aspect which makes the solid-state relay different from the electromechanical relay is it does not contain any moving parts.
Instead of the moving parts, the solid-state relays use semiconductor devices like thyristors and transistors to switch the power-up and up to a hundred amperes at a time. The solid-state relays or the SSR also possess faster switching speeds when compared to the electromechanical relays. The SSR also does not create any physical wear out like the electromechanical relay. The solid-state relay also provides limited arrangements, not like the electromechanical relays.
The significant advantages of the solid-state relay
- The solid-state relay has a slim body and can allow tight packing to the users.
- They also offer a silent operation as no noise is created like the electromechanical relay.
- The SSR switching time is much faster than that of the electromechanical relay. The switching time is the time taken for the LED to turn ON and OFF, which is measured in micro and milliseconds.
- They can also offer an increased and more prolonged life as they do not use any physical moving parts. Due to the non-availability of the material moving parts, they are also affordable, and the users are also free from the maintenance cost of the moving parts.
- The amount of resistance at the output always remains constant and does not depend on the amount of use of the relay.
The significant disadvantages of the solid-state relay
- The whole device of the SSR is also at risk of spurious switching due to the voltage. The entire transition process is carried at a good pace.
- The SSR also offers isolated and a biased supply to the entire gate charge circuit.
- The SSR also has more significant chances for a shorten output termed as fail, while the electromechanical relay can have more extended output termed as open.