Ndrkrnt rl (electricity) a relay designed to operate when its coil current falls below a predetermined value. Mcgraw-hill dictionary of scientific & technical terms, 6e, copyright 2003 by the mcgraw-hill companies, inc.
Translation and definition undercurrent relay, dictionary english-english online. Translation memories are created by human, but computer aligned, which might cause mistakes.
To check overcurrent time, suddenly apply the desired preset current to the relay by closing sl. The time read on the timer is that required to close the left contacts.
such equipment utilizes current relays to prevent malfunctions due to excessive or insufficient amounts of electrical current (overcurrent and undercurrent, respectively).
A device such as a centrifugal-speed switch, a slip-frequency relay, a voltage relay, an undercurrent relay, or any other type of device that operates at approximately the synchronous speed of a machine 14 underspeed device a device that fu nctions when the speed of a machin e falls below a predetermined value.
In electrical engineering, a protective relay is a relay device designed to trip a circuit breaker when a fault is detected. The first protective relays were electromagnetic devices, relying on coils operating on moving parts to provide detection of abnormal operating conditions such as over-current, overvoltage, reverse power flow, over-frequency, and under-frequency.
Relays are switches that open and close circuits electromechanically or electronically. Relays control one electrical circuit by opening and closing contacts in another circuit. As relay diagrams show, when a relay contact is normally open (no), there is an open contact when the relay is not energized.
relays are the switches which aim at closing and opening the circuits electronically as well as electromechanically. It controls the opening and closing of the circuit contacts of an electronic circuit. When the relay contact is open (no), the relay isnt energize with the open contact.
the characteristic time of the relay is extremely large as compared to the idmt and the very inverse relay. This relay is used for protecting the cable, transformer, etc. The relay can operate instantly when the pickup value of the current is more than the relay setting time. The relay provides faster operation even under the fault current.
a relay that operates or picks up when its current exceeds a predetermined value (setting value) is called overcurrent relay. Overcurrent protection protects electrical power systems against excessive currents which are caused by short circuits, ground faults , etc. Overcurrent relays can be used to protect practically any power system elements, i.
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