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RECTIFICATION. X-RAY CIRCUIT. Whenever the art of medicine is loved, there is also love for humanity. Hippocrates. RECTIFICATION. PROCESS BY WHICH ALTERNATING CURRENT IS CHANGED TO PULSATING DIRECT CURRENT. A/C GENERATOR A/C CURRENT 1 PHASE. A/C ( UNRECTIFIED)- FREQUENCY 60 Hz.

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Presentation Transcript
rectification1

RECTIFICATION

PROCESS BY WHICH ALTERNATING CURRENT IS CHANGED TO PULSATING DIRECT CURRENT

a c generator a c current 1 phase
A/C GENERATOR A/C CURRENT1 PHASE

A/C ( UNRECTIFIED)- FREQUENCY 60 Hz

slide6

60 POSITIVE PULSES/SEC

60 NEGATIVE PULSES/SEC

slide7

60 POSITIVE

PULSES

60 NEGATIVE

PULSES

120 PULSES

60 FULL CYCLES

d c half wave rectified
D/C HALF WAVE RECTIFIED

D/C HALF-WAVE – 60 POSITIVE PULSES/SEC

NEGATIVE PULSES ARE SUPPRESSED

1 PULSE/CYCLE

d c full wave rectified
D/C FULL WAVE RECTIFIED

D/C HALF-WAVE – 120 POSITIVE PULSES/SEC

2 PULSES/CYCLE

three phase power
THREE PHASE POWER

http://www.shermanlab.com/xmwang/javappl/acMotor1.html

d c 3 phase 6 pulse current
D/C -3 PHASE 6 PULSE CURRENT

D/C 3 PHASE 6 PULSE – 6 PULSES/CYCLE

d c 3 phase 12 pulse
D/C - 3 PHASE 12 PULSE

D/C 3 PHASE 12 PULSE – 12 PULSES/CYCLE

reverse bias
REVERSE BIAS

+

-

NO

X-RAY

rectification types
RECTIFICATION TYPES
  • HALF-WAVE
  • FULL WAVE
  • THREE PHASE SIX PULSE
  • THREE PHASE TWELVE PULSE
  • HIGH FREQUENCY SINGLE PHASE
rectification i phase
RECTIFICATION – I PHASE

NO RECTIFICATION

HALF-WAVE

FULL-WAVE

three phase power1
THREE PHASE POWER

http://www.shermanlab.com/xmwang/javappl/acMotor1.html

voltage ripple
VOLTAGE RIPPLE
  • HALF WAVE------------------- 100%
  • FULL WAVE ------------------ 100%
  • 3 PHASE 6 PULSE ----------- 13%
  • 3 PHASE 12 PULSE ---------- 4%
  • HIGH FREQUENCY ---------- <1%
ripple1
RIPPLE

200%

100%

100%

checking failure of rectification system
CHECKING FAILURE OF RECTIFICATION SYSTEM
  • SPINNING TOP TEST – 1 PHASE EQUIPMENT
  • SYNCHRONOUS SPINNING TOP TEST-

3 PHASE WITH LONGER EXPOSURE TIMES

  • OSCILLOSCOPE- 3 PHASE EQUIPMENT WITH SHORT EXPOSURE TIMES
half wave rectification2
HALF- WAVE RECTIFICATION

# OF DASHES = TIME (SEC) x 60 PULSES

full wave rectification3
FULL- WAVE RECTIFICATION

# OF DASHES = TIME (SEC) x 120 PULSES

3 phase rectification longer exposure time
3 PHASE RECTIFICATION-LONGER EXPOSURE TIME

DEG. OF ARC = 360°/ sec x TIME (sec)

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