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Difference between overcurrent relay and fuse?
Current is flow of electricity charge. Voltage is a measure of potential energy or charge. Fuse. Is a device that opens when the current rating is exceeded this stopping the flow of current.
What the three types of over current protection relay and describe the principles of operation?
over current protection relay
How does time inverse over current relay work?
Over Current (Inverse Time) Over current relay function monitors the general balanced overloading and has current/time settings. This is determined by the overall protective discrimination scheme. There advantage over definite time relays is that they can have much shorter tripping times can be obtained without any risk to the protection selection process. These are classified in accordance with there characteristic curves, this indicates the speed of the operation. Based on this they are defined as being inverse, very inverse or extremely inverse. The typical settings for these relays are 0.7-2In (normal or rated generator current) in 1-10 second. Inducing a calibrated test current through the normal load current tests this relay.
Is feeder protection relay and ring main unit protection relay same?
No there not same
What is ocr efr uvr referred to in air blast circuit breaker?
ocr-over current relay(senses the over current in the circuits) efr-earth fault relay uvr-under voltage relay
What happens to the force generated by the circular coil of Relay if current direction is reversed?
As long as the amperage stays the same, the force in the relay stays the same regardless of direction of the current.
What is the difference between current relay and potential relay?
I think what you mean to ask is; "The difference between a current sensing, and potential sensing relay. I've never heard of a potential relay. Relays are "pulled in" by applying voltage to the coil, typically 120Vac, or 24Vdc. A current sensing relay will close its contacts when it is wired to sense a particular amount of current. Instead of applying voltage (turning on) the relay, it closes contacts when current flows through it. HVAC technician ***** A 'current' relay has a coil of low resistance wire (heavy gauge wire, few turns), and is energised only by a large current, such as the initial current of a motor starting. The relay coil is wired in series with the run/main winding of the motor, and the relay contacts are normally open. As the motor tries to start, the large current closes the relay, which momentarily brings the start/aux winding into circuit, allowing the motor to go. Used for split-phase and capacitor-start motors. A 'potential' relay has a coil of high resistance wire (light wire, many turns), and is wired in parallel with the start/aux winding, and the relay contacts are normally closed. At initial motor start-up, high curent will flow through both the run and start windings of the motor. As the motor reaches operating speed, the current reduces, and a "back EMF" is produced allowing current to now pass through the potential relay coil, and open the contacts. Used for capacitor-start and cap-start cap-run motors. Another HVAC technician. you sound like a real ahole. everyone in the field calls them potential relays, in addition look at a schematic on an AC and you'll find "PR" potential relay. what a dip#hit
If the potential difference between two points increases what will the current do?
If the potential increase and resitance remain the same ,the current will encrease
What is the difference between an earth fault relay and an over current relay?
earth fault relay is also a type of over current relay but the set value of current or relay sensing current is much less than the maximum load current.in over current relay relay sensing current ise than maximum load current mor
Is a resistor and a relay the same thing?
No, they are not the same. A resistor is a current reducer and a relay is essentially a switch (using low voltage to switch high voltage on/off)
Would a current be reduced if both terminals had the same charge?
If both terminals had the same potential there would be no current flow.
Which instrument transformer mostly used in relays?
Both Current and Potential Transformers are used for relays according to the working of relay.
What voltage does a potential relay operate from?
The voltage for a potential relay will depend on the circuit that the relay is installed in. The relay can be made for low voltages (5v) to higher voltages (440.)
How are current and wind alike?
Current arises when "compressed" charges (high potential) expand into lower "pressure" areas (low potential). Wind is much the same.
What is plug setting multiplier of relay?
the actual r.m.s current flowing in the relay expressed as a multiple of the setting current (pick up current) is known as plug setting multiplier.mathematically ,PSM= SECONDARY CURRENT/RELAY CURRENT SETTINGorPSM= (primary current during fault)/(relay current setting *C.T ratio)
What is CT operated electronic relay?
CT (Current Transformer ) is essential whether is electronic relay or electromagnetic relay. A relay requires the CT to sense the line current.
Difference between overcurrent relay and fuse?
Current is flow of electricity charge. Voltage is a measure of potential energy or charge. Fuse. Is a device that opens when the current rating is exceeded this stopping the flow of current.
