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KARIBA SOUTH POWER STATION
UNIT 2 THYRISTOR OPEN CIRCUIT
TROUBLESHOOTING
23 JANUARY 2019
Presentation Road Map
1. Introduction
2. Actions carried out
3. Findings
4. Recommendations
2
PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN
2019
Introduction
Unit 2 Exciter experienced a thyristor
open circuit alarm on 21/01/2019
Troubleshooting was carried out on
22/01/2019
3
PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN
2019
Actions carried out
 The Exciter PLC was connected and
monitored using the Exciter Laptop.
 Raw data was collected from the AI
modules.
 Actual signal VDC values were measured
using a multi-meter.
4
PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN
2019
Actions carried out
5
PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN
2019
Actions carried out
6
PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN
2019
Actions carried out
7
PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN
2019
Actions carried out
8
PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN
2019
Actions carried out
9
PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN
2019
Actions carried out
10
PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN
2019
Findings
 Thyristor Open Circuit Alarm was observed
when either Convertor 1 or Convertor 2
were in service
 The currents on the ammeters were
balanced
 This showed the problem was neither in
the thyristors nor in the thyristor firing
card but was in the monitoring circuit.
11
PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN
2019
Findings
 After measuring, signals from AI10 and AI14 were
relatively lower compared to the rest of the signals.
12
PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN
2019
Signal VDC
AI Module HE693 ADC405 (AI9-AI12)
AI9 0.843
AI10 0.325
AI11 0.426
AI Module HE693 ADC405 (AI13-AI16)
AI13 0.84
AI14 0.337
AI15 0.707
Findings
 It was discovered that both Analogue Input
modules were not faulty since they were
showing a true reflection of signals from
the DCCTs.
13
PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN
2019
Recommendations
There is need to connect the process
calibrator on the outputs of the DCCTs
to measure their current output and
check for their correct functionality.
14
PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN
2019
THANK
YOU!
15

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U2 Thyristor open circuit troubleshooting 23_Jan_2019.pptx

  • 1. KARIBA SOUTH POWER STATION UNIT 2 THYRISTOR OPEN CIRCUIT TROUBLESHOOTING 23 JANUARY 2019
  • 2. Presentation Road Map 1. Introduction 2. Actions carried out 3. Findings 4. Recommendations 2 PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN 2019
  • 3. Introduction Unit 2 Exciter experienced a thyristor open circuit alarm on 21/01/2019 Troubleshooting was carried out on 22/01/2019 3 PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN 2019
  • 4. Actions carried out  The Exciter PLC was connected and monitored using the Exciter Laptop.  Raw data was collected from the AI modules.  Actual signal VDC values were measured using a multi-meter. 4 PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN 2019
  • 5. Actions carried out 5 PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN 2019
  • 6. Actions carried out 6 PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN 2019
  • 7. Actions carried out 7 PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN 2019
  • 8. Actions carried out 8 PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN 2019
  • 9. Actions carried out 9 PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN 2019
  • 10. Actions carried out 10 PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN 2019
  • 11. Findings  Thyristor Open Circuit Alarm was observed when either Convertor 1 or Convertor 2 were in service  The currents on the ammeters were balanced  This showed the problem was neither in the thyristors nor in the thyristor firing card but was in the monitoring circuit. 11 PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN 2019
  • 12. Findings  After measuring, signals from AI10 and AI14 were relatively lower compared to the rest of the signals. 12 PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN 2019 Signal VDC AI Module HE693 ADC405 (AI9-AI12) AI9 0.843 AI10 0.325 AI11 0.426 AI Module HE693 ADC405 (AI13-AI16) AI13 0.84 AI14 0.337 AI15 0.707
  • 13. Findings  It was discovered that both Analogue Input modules were not faulty since they were showing a true reflection of signals from the DCCTs. 13 PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN 2019
  • 14. Recommendations There is need to connect the process calibrator on the outputs of the DCCTs to measure their current output and check for their correct functionality. 14 PRESENTATION ON THYRISTOR OPEN CIRCUIT FAILURE ALARM JAN 2019

Editor's Notes

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