Till 15th feb

Design and programing of Relay Menu Interfacing LCD And Keyboard Design and Simulation of ZCD Design and Simulation of Measurement of Voltage Magnitude

27th Jan 15th Feb 1st Mar 15th Mar

8

80

100

100

7

40

90

100

0 0

35

85

5

40

75

95

Project Progress

PF V and I MHO Total

04/13/2023Electrical Department PES University

Designing of mho relay menu

• Interfacing of LCD.

• Interfacing of Keyboard.• ON/OFF Control.• Reset.• Menu.• UP/DOWN/LEFT/RIGHT for navigation.

• Menu Consist of• MTA Setting.• Zone 1, Zone 2, Zone 3 impedance setting.

04/13/2023Electrical Department PES University

ZCD (Zero crossing detector)

• Zero crossing detector(ZCD) is a voltage comparator that switches the output between +Vsat and –Vsat when the input crosses zero reference voltage.

• Working of ZCD can be easily understood if you know the working of a basic op amp comparator.

• In ZCD, we are setting one of the inputs as zero i.e. zero reference voltage.

• The output is driven into –Vsat when the input signal passes through zero to positive direction.

• Conversely, when input signal passes through zero to negative direction, the output switches to +Vsat.

04/13/2023Electrical Department PES University

Simulation

Multisim 13 VBB StudioProteus 8

04/13/2023Electrical Department PES University

Different type of Zcd

04/13/2023Electrical Department PES University

Different output of zcd

04/13/2023Electrical Department PES University

Simulation on Proteus 8

04/13/2023Electrical Department PES University

Hardware output

• Output wave from ZCD for Current input is square wave with 50Hz frequency

• Output wave from ZCD for Voltage input is square wave with 50Hz frequency

• Output magnitude of ZCD is equal to VCC (3.56v, 5v, 12v)

04/13/2023Electrical Department PES University

Current Input

• Current sensor is used to get corresponding voltage output and wave.

• From the output wave we will get current zero crossing and magnitude.

04/13/2023Electrical Department PES University

Input voltage measurement

• High voltage is converted into low voltage by step down transformer.

• Analog voltage converted into Digital by ADC.

• Voltage magnitude is found by sampled digital value.

04/13/2023Electrical Department PES University

Power factor measurement

• From the ZCD we will get square wave for current and voltage zero crossing.

• The time gap between this 2 output wave of ZCD is found.

• From the time interval Power factor is calculated.