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PRESENTED BY : AZIZUL BIN AB KADIR GENERAL MANAGER M H Y PRO-POWER SERVICES SDN BHD Malaysia

REPORT AND ANALYSIS OF OLTC DYNAMIC RESISTANCE FOR TRANFORMER (T1) PPU KELANA JAYA. PRESENTED BY : AZIZUL BIN AB KADIR GENERAL MANAGER M H Y PRO-POWER SERVICES SDN BHD Malaysia. CURRENT DRM ANALYSIS. DYNAMIC CURRENT MEASUREMENT CONTINUOUS DOWN PHASE 1U -1W.

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PRESENTED BY : AZIZUL BIN AB KADIR GENERAL MANAGER M H Y PRO-POWER SERVICES SDN BHD Malaysia

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  1. REPORT AND ANALYSIS OF OLTC DYNAMIC RESISTANCE FOR TRANFORMER (T1) PPU KELANA JAYA PRESENTED BY : AZIZUL BIN AB KADIR GENERAL MANAGER MHY PRO-POWER SERVICES SDN BHD Malaysia

  2. CURRENT DRM ANALYSIS

  3. DYNAMIC CURRENT MEASUREMENT CONTINUOUS DOWN PHASE 1U -1W

  4. DYNAMIC CURRENT MEASUREMENT CONT. UP PHASE 1U -1W Abnormality at tap suspected due to current drop to almost open circuit

  5. DYNAMIC CURRENT MEASUREMENT CONT DOWN PHASE 1V -1W

  6. DYNAMIC CURRENT MEASUREMENT CONT UP PHASE 1V -1W Abnormality at tap suspected due to current drop to almost open circuit

  7. OLTC TRANSITION ANALYSIS

  8. TRANSITION TIMES (ms ) CONT UP & DOWN CONT UP CONT DOWN

  9. TRANSITION TIMES (ms ) CONTINUOUS RECORD UP & DOWN CONT DOWN CONT UP

  10. FURTHER ANALYSIS….ZOOMING INTO TRANSITIONS

  11. COMPARISON BETWEEN GOOD AND BAD TRANSITION TIME 1U-1W (TAP 3-4 CONT UP & CONT DOWN ) Zoom in tap 4-3 cont down BAD GOOD

  12. COMPARISON BETWEEN GOOD AND BAD TRANSITION TIME 1U-1W (TAP 14-15 CONT UP & CONT DOWN ) Zoom in tap 14-15 cont up Zoom in tap 15-14 cont down BAD GOOD

  13. COMPARISON BETWEEN GOOD AND BAD TRANSITION TIME 1V-1W (TAP 3-4 CONT UP & CONT DOWN ) Zoom in tap 4-3 cont down Zoom in tap 3-4 cont up BAD GOOD

  14. COMPARISON BETWEEN GOOD AND BAD TRANSITION TIME 1V-1W (TAP 14-15 CONT UP & CONT DOWN ) Zoom in tap 15-14 cont down Zoom in tap 14-15 cont up GOOD BAD

  15. ZOOM IN TAP 3-4 CONT UP ABNORMAL TRANSITION TIME

  16. EXAMPLE NORMAL TRANSITION TIME

  17. COMPARISON BETWEEN GOOD AND BAD TRANSITION TIME BAD GOOD

  18. VISUAL SITE ANALYTICAL

  19. SUSPECTED THE TENSIONAL SPRING PROBLEM OCCURRED AT SECOND PARALLEL RESISTOR (PHASE W)

  20. BAD CONDITION SUSPECTED OCCURED AT FIXED CONTACT

  21. THE BAD CONDITION OF THE ARCING TAP SWITCH

  22. EXPERTISE ANALYSIS

  23. Based on Dynamic Current Measurement (DCM) profiles, the arching tap switch and the current changes, there is some indication of the bad contact condition. • Abnormality at some of the contact condition and few selected current profiles indicates the ripple current drop to almost an open circuit as showing in the graphs • Suspected tensional spring problem occurred at second parallel resistor moving contact. • Transitions time of the OLTC operation averagely at 50 to 60 ms for normal condition except for phase 1U – 1W & 1V-1W (30 - 38 ms).

  24. THANK YOU!! AZIZUL BIN AB KADIR HP 017-9171107 expert@mhypropower.com/mhypps@gmail.com www.mhypropower.com

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