three phase fault analysis with auto reset on temporary fault and permanent trip
TRANSCRIPT
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THREE PHASE FAULT ANALYSIS WITH AUTO RESET ON TEMPORARY FAULT AND PERMANENT TRIP OTHERWISE
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Three Phase Fault Analysis With Auto Reset On Temporary Fault And Permanent Trip Otherwise
Introduction:
The project is designed to develop automatic mechanism off for a three-phase project automatically resets the result after a short break, in a temporary fault events as it remains capable of switching off in the event of permanent failure.
Three single phase transformers are wired in star input and star output having input 220 volt and output at 12 volt.
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Three Phase Fault Analysis With Auto Reset On Temporary Fault And Permanent Trip Otherwise
The contact relays which are used energized from the output of comparators in the event of fault conditions by tracking the input voltage conditions for each phase at the input of the comparators.
Two 555 timers are used, one in monostable and the other in astable mode to drive a power relay that handles the load.
A Set of switches are used to introduce LL fault, LG fault ,3L short to get the comparator output to drive both the relays to disconnect the load.
Short duration fault returns the load immediately while long duration shall result in permanent trip.
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Three Phase Fault Analysis With Auto Reset On Temporary Fault And Permanent Trip Otherwise
INTRODUCTION BLOCK DIAGRAM TRANSMISSION LINE FAULTS COMPARATOR 555 TIMER RELAY WORKING OF THE PROJECT ADVANTAGES APPLICATIONS CONCLUSION
Overview:
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Three Phase Fault Analysis With Auto Reset On Temporary Fault And Permanent Trip Otherwise
Block Diagram:
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Three Phase Fault Analysis With Auto Reset On Temporary Fault And Permanent Trip Otherwise
Fault types include:
Single line to ground(LG)
Line to line(LL)
Double line to ground(LLG)
Three phase balanced
Transmission line Faults:
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Three Phase Fault Analysis With Auto Reset On Temporary Fault And Permanent Trip Otherwise
Comparator:
Op amps & comparators look very similar
But a comparator gives a logic output indicating the relative potentials on its two inputs
An op amp amplifies the differential voltage between its two inputs – and is designed always to be used in closed-loop applications
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Three Phase Fault Analysis With Auto Reset On Temporary Fault And Permanent Trip Otherwise
Potential dividers are connected to the inverting and non inverting inputs of the op-amp to give some voltage at these terminals.
Supply voltage is given to +v and –v is connected to ground.
The output of this comparator will be logic high (i.e. Supply voltage) if the non-inverting terminal input is greater than the inverting terminal input of the comparator.
If the inverting terminal input is greater than the non-inverting terminal input then the output of the comparator will be logic low (i.e. Gnd).
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Three Phase Fault Analysis With Auto Reset On Temporary Fault And Permanent Trip Otherwise
555 Timer:
The 555 Timer IC is an integrated circuit (chip) implementing a variety of
timer and multivibrator applications.
The original name was the SE555 (metal can)/NE555 (plastic DIP) and
the part was described as "The IC Time Machine".
Depending on the manufacturer, the standard 555 package includes over
20 transistors, 2 diodes and 15 resistors on a silicon chip installed in an 8-
pin mini dual-in-line package (DIP-8)
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Three Phase Fault Analysis With Auto Reset On Temporary Fault And Permanent Trip Otherwise
PIN DIAGRAM OF 555:
The 555 timer IC is a simple 8 pin DIL
package IC.
It can:
be used as a monostable
be used as an astable
source or sink 100mA
use supply voltages of 5v to 15v
disrupt the power supply - use a
decoupling capacitor!
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Relay:It is a electro magnetic switch
Used to control the electrical devices
Copper core magnetic flux plays main role here
Three Phase Fault Analysis With Auto Reset On Temporary Fault And Permanent Trip Otherwise
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Three Phase Fault Analysis With Auto Reset On Temporary Fault And Permanent Trip Otherwise
Working:
In this project two 555 timers are used 1 in monostable mode and other in astable mode.
When any push button is pressed for a short time the load is disconnected only for that period indicating a temporary fault.
If the push button is pressed for longer time then the astable timer s activated and it causes a permanent fault and disconnects the load permanently.
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Three Phase Fault Analysis With Auto Reset On Temporary Fault And Permanent Trip Otherwise
Advantages:
Safety Equipment
Work Complete Time to Time
More Efficiency
Reduce Losses
More Reliable
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Three Phase Fault Analysis With Auto Reset On Temporary Fault And Permanent Trip Otherwise
Applications: Substation
Transformer
Drives & Relay
Transmission Line
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Three Phase Fault Analysis With Auto Reset On Temporary Fault And Permanent Trip Otherwise
Conclusion:
The concept in the future can be extended to developing a mechanism to send message to the authorities via SMS by interfacing a GSM modem.
Three Phase Fault Analysis With Auto Reset On Temporary Fault And Permanent Trip Otherwise is very useful to Engineering students.
