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Vanessa Nader
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Which instrument transformer mostly used in relays?
Both Current and Potential Transformers are used for relays according to the working of relay.
What is difference between to busbar and feeder?
The busbar is used as a conductor and is used as a connection between the parallel and the feeder. The feeder is the supply, and it handles the relays.
What is the difference between directional and non directional over current protection?
The directional part. Directional relays will operate for events "in front of" them, but will not operate for events "behind" them. Typically directional relays are used in non radial situations such as on the bulk electric system. Non-directional overcurrents are commonly used on radial lines.
What is the function of RS 485 connection?
The symmetrical pin layout of the RJ11 sockets on the Unitronics PLCs allows an easy way of interconnecting the PLCs with both RS232 and RS485 communications. For RS232a crossover cable is used where pin 1 is connected with pin 6 at the other connector, pin 2 with pin 5, etc. This interconnects the transmit and receive signals of both PLCs, and also the handshaking signals DTR and DSR. If handshaking is not necessary, an ordinary 4 wire telephone cable could be used, provided that the pins are cross-connected as shown in the picture below. Otherwise a full 6 wire cable must be used. Two wire telephone cables will not function because in that case the ground signal levels on both sides will be floating. Unitronics RJ11 RS232 crossover cableRJ11 plug 1RJ11 plug 2Function16DTRDSR25Signal ground34TxDRxD43RxDTxD52Signal ground61DSRDTRRS485 is in its design a different interface from RS232. The RS485 interface allows the creation of multipoint networks. The normal way to implement this is with a two wire system with differential signal levels. These signals are commonly called A and B in RS485 systems. The A signals of all devices should be connected with each other and the same goes for the B signals. Therefore for RS485 communications no crossover cable is used. To prevent noise to interfere with the communications, often twisted pair cable is used. The diagram below shows a basic RS485 cable for use with the RJ11 socket on Unitronics PLCs. You can easily connect more devices by splitting the cable at one connector and adding another cable to it.Unitronics RJ11 RS485 cableRJ11 plug 1RJ11 plug 2Function11A (+)A (+)
Why star connection used in transmission?
Transmission circuits are prone to earth faults.Only star connection permits flow of earth fault current and the operation of earth fault relays.
Can factory talk hmi be used for slc500 plcs?
yes factory talk view can be connected to a scl500.
What are the different types of relays used in substation?
kinds of electrical relays
What would you a rack mounting PLC for?
A rack mounted PLC refers to specific types of programmable logic controllers. Rack mounted PLCs can be used in any machine or application that has a control panel.
Which instrument transformer mostly used in relays?
Both Current and Potential Transformers are used for relays according to the working of relay.
What applications would you use a rack mounting plc?
A rack mounted PLC refers to specific types of programmable logic controllers. Rack mounted PLCs can be used in any machine or application that has a control panel.
What applications would use a rack mounted plc?
A rack mounted PLC refers to specific types of programmable logic controllers. Rack mounted PLCs can be used in any machine or application that has a control panel.
Why relays are used in car?
Relays are used to control high current using low current. They help eliminate a lot of unnecessary wiring.
What type of protection is used on power transformers?
Depending on the size of the transformer, it can be protected by fuses, thermal elements, or by a full relay protection package, which could include overcurrent relays, differential relays, and distance relays.
Which types of relay is use in power transformer?
A 'power transformer' is a category of transformer used within electricity transmission and primary distribution systems. Relays are widely used with power transformers to provide various types of protection that will act to disconnect the transformer in the event of a fault. Examples of these relays include Buchholz relays, earth-fault relays, and differential relays. Relays are also used to operate a power transformer's automatic tap-changing mechanism in order to compensate for changes in load.
Does MARK-1 use electromagnetic relays?
Yes,Mark-1 used 3300 electromagnetic relays.The first computer that used electromagnetic relays was COMPLEX CALCULATOR.
Are potential relays used to energize or de energize split phase motors?
Yes, potential relays are used to energize and de energize split phase motors.
PLC Training is a Great Way to Develop a New Career?
Due to many changes in the economy, many people have been forced to consider new career options. One possibility you should consider is PLC training. PLC stands for programmable logic controller. The PLC is a kind of computer first designed during the 1960’s and 70’s to replace incredibly complicated electrical systems in automobiles that at one time had to use a few hundred thousand different relays. Out of this effort to find a simpler way for automobile electronic systems to operate came the PLC. PLCs, unlike the kind of computers we are most used to, were designed with electrical technicians in mind as opposed to regular computer programmers. Due to this design influence many PLCs implement a computer language referred to as “ladder logic.” Ladder logic programming language is similar to the schematic design of circuits. The logic was that ladder logic would be easily understood by technicians and engineers without much new training. Many PLCs today still implement ladder logic. However, new programming languages are now used in a number of PLCs. These include BASIC programming as well as “state logic.” State logic is a kind of programming language specifically designed for use in PLCs that implements state transition diagrams that use a series of “tasks,” “states,” and “statements” to tell electronic systems what to do. State logic is considered one of the most advanced programming languages that exist. Due to the use of these complex programming languages and the use of multiple inputs and outputs, PLCs are implemented as a way to control the very intricate timed electrical processes of the many different components in a machine. Uses of PLCs across different industries are wide and varied. They are of course used in the assembly of automobiles for which they were designed. A PLC has probably told the traffic light you have stopped at to change from red to green. You may have even encountered one that told the roller coaster car you were riding in to slow down. Due to the many uses of PLCs and the specified knowledge it takes to work on one, PLC training is a great option for developing a brand new career.
