By Bhattacharya S. K., Singh B.
Regulate of Machines is likely one of the most crucial useful components for electric and mechanical engineers operating in undefined. during this period of automation and regulate, each engineer has to acquaint himself at the layout set up, and upkeep of keep an eye on platforms. This topic needs to locate its position as a mandatory utilized engineering topic in measure and degree curriculum. a few revolutionary states and self sufficient associations have already brought this topic of their curriculum. during this booklet, static keep watch over and programmable controllers were integrated maintaining in view the most recent advancements in sleek undefined. Relay and static keep an eye on were handled in information. lots of the keep an eye on circuits integrated during this booklet were taken from Indian undefined. A bankruptcy has been dedicated to defense of cars and troubleshooting on top of things circuits. The bankruptcy on PLC has been made very complicated to accommodate all features of common sense controllers. evaluation questions were integrated on the finish of every bankruptcy. the reasons of circuits and layout method of keep watch over circuits were made extremely simple to assist scholars comprehend simply. scholars, lecturers and store ground and layout workplace engineers will locate this ebook a really important significant other.
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Additional info for Control of Machines. Revised second edition
Brief description of a relay which works on the basis of detection of negative sequence current is explained as follows. The relay has two built-in current transformers which sense currents of the motor. The secondary of the CTs feeds a negative sequence filter. The output from this filter is proportional to the negative sequence component of currents. This output is fed to a sensor which detects the level of negative sequence components of current and thus trips the motor starter by opening its control contact.
5 shows a DTH 100 L & T make MCCB. Fig. pm5 14 15 CONTROL CIRCUIT COMPONENTS An MCCB automatically isolates an electrical circuit under sustained overloads or short circuits. A thermal release consisting of bimetallic elements having inverse time current tripping characteristic trips the circuit breaker on sustained overload. The breaker is opened by an electromagnetic release in case of short circuit faults. When the current is less than 10 times the setting of the thermal release the breaker trips due to thermal release and when current exceeds 10 times its value, the breaker is opened by magnetic release.
When the latch coil is energised the relay operates and is held in the energised position either by a mechanical latch or a permanent magnet. The relay remains in the energised position even when the latch coil is de-energised. The relay can be brought back to the deenergised position only when the unlatch coil is energised. The relay construction can be of two types depending on how the relay is held in the energised position when the latch coil is de-energised. , the mechnical latched type and the permanent magnet type are described as follows.