0
Why pick-up current is higher than dropout current in instantaneous over-current relay?
Wiki User
∙ 8y agoWant this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
What is the difference between over current and overload condition?
The term, 'overcurrent', describes either an 'overload current' or a 'short-circuit current'.An 'overload current' is a current that is higher than a circuit's 'rated current'. For example, if you have too many loads plugged into the same circuit, then the resulting current is an 'overload current'.A 'short-circuit current' is a large current resulting when a line ('hot') conductor accidentally makes contact with either a neutral conductor or an earth (ground) conductor.
Which is the dangerous current?
You can't really separate them. It's the current flowing through your body that does the damage, but the value of the current depends on the voltage across your body -the higher the voltage, the higher the resulting current.
Which has higher leakage current-Si or Ge?
Ge
Does resistance depend upon current?
The higher the resistance the lower the current flow. It restricts the flow of electrical current. The resistance will not depend upon the current. The current flow will depend on the resistance.
How does resisitance affect currents?
The higher the resistance the less current can pass through therefore the current will be lower.
When overcurrent relay operat?
If the current exceeded the threshold current or (nominal current) which is already defined and configured to the relay. For example, if the Threshold current is 1 Amps, and a fault occurred in the system which will result to increase the current so it will be higher than 1 Amps, lets say 5 Amps, so the relay will operate to stop the faulted section.
How do you minimize dropout rate from higher education?
Involve stuff from what is cool these days,
What is the difference between over current and overload condition?
The term, 'overcurrent', describes either an 'overload current' or a 'short-circuit current'.An 'overload current' is a current that is higher than a circuit's 'rated current'. For example, if you have too many loads plugged into the same circuit, then the resulting current is an 'overload current'.A 'short-circuit current' is a large current resulting when a line ('hot') conductor accidentally makes contact with either a neutral conductor or an earth (ground) conductor.
How diffferent are the basic circuit diagrams of an over-current protection relay and an over-voltage protection relay?
If you are talking about electromechanical overcurrent/voltage relays, reference the manual for that particular relay. an exampel of an overcurrent would be a CO-7, 8, or 9. These have settings of pickup, and time lever for a time overcurrent element. The basic principle is force is applied to a disk, that when spun, will initiate the tripping of a contactor (which will trip a breaker). This force is kept in check by the pickup and time lever settings, which are used to create a conteracting force on the disk. The higher the current, the greater the applied force is to the disk, and the conteracting force will remain relatively unchanged, so the relay will trip faster. CO-7, 8, 9 also can have an instantaneous pickup (operates slightly different). Voltage relays will operate in similar fashion. The important thing to note here is every relay type is slightly different, so the manual should be consulted if you are looking for specific information. the CO-7,8,9 type relay manuals can be easily found with a good search.
How do the strategies of typical therapies used to treat alcohol dependence compare to the strategies used in Alcoholics Anonymous?
has been found to have a higher dropout rate.
Are high school drop out rates high in the school year of 2007-2008?
Yes. Sadly, dropout rates are getting higher and higher every year. Every nine seconds in America, a student becomes a dropout. In 2004 alone, six million 15-18 year olds had not completed high school (Mentor Research Institute, 2006). And that number is just growing. -Amanda Smith
When there is more electrons does it mean the voltage will be higher or the current will be higher?
More electrons means more current, by definition.
Why the current flow from higher potential to lower potential?
Current defined as Positive charge flow , flows from higher potential to the lower. Current defined as electron flow, flows from lower potential to higher. In general Potential and Current are defined by positive charge.
What is the time delay of the over current sensing circuit and what is its duration?
Many electrical loads pull a high starting current. A common 60W light bulb, for instance, can pull 900W for a few lines cycles. These are generally not an issue, however. What is an issue, is electric motors. They can, in the larger varieties, pull substantial run current and yet pull four times that current to start. That can trip an instant trip breaker, but that is not desired. Many breakers have two trip settings. An instant trip, which is some number of multiples of the rating, and a delayed trip, which is based on time. The instant trip takes care of short circuits, while the delayed trip takes care of the need for higher power on startup, yet provides decent protection during run. The duration of the delayed trip is a function of how much overcurrent is present, so we can not really say how long it is, unless you get out the specification sheet for the individual breaker. Suffice to say that a small overcurrent might take 20 or 30 seconds to trip, while a larger overcurrent, say 5 times rated, might take 2 seconds, which is more than enough time to get the motor started.
Discuss the series operation of LASCR?
You would get output when the intensity of the applied light is higher and series current would make the current amplitude higher.
High voltage will trip a circuit breaker?
A higher voltage means that a higher current will flow in the same load. It is the current that causes the breaker to trip.
Why noload current in big motors is higher than load current?
That is not always true.
