condition monitoring diagnostic on hotspot at substation

8/2/2019 Condition Monitoring Diagnostic on Hotspot at Substation

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Condition Monitoring Diagnostic on

Hotspot at Substation

By

W. AMIRUL

AM NSEM


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Content

Introduction

Guideline

Analysis

Thermographic flowchart

Recommendation & Conclusion


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Introduction

Tripping report from CTIS due to hotspot


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Introduction

The failure which contribute to conductor

snapped due to hotspot basically might

be cause by:

Wrong interpretation when using thermal

camera (hotspot but cannot define a

hotspot especially during daylight)

Thermal camera type (old type-short

wave camera)


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Introduction

Thermal camera used in TNB:

1. FLIR

2. NEC3. VISOR


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Introduction

Wien Law:


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Introduction

Wien Law:

Short wave camera (1-2um): Taken too

much radiation from sun (surrounding

heat) during daylight which make thermal

image unclear for the hotspot issue.

Long wave camera(8-14um): Daylight

does not give impact even at noon.

Suitable for TNB.


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Limits used in TNB: Condition Monitoring Guideline

Guideline


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Wrong interpretation-without analysis during daylight:

Analysis

IS IT A

HOTSPOT???

22.1

31.0 C

23

24

25

26

27

28

29

30

31


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Clear image hotspot but still not critical

Analysis

24.7

54.3 C

25

30

35

40

45

50


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Wrong interpretation if image taken like this :

Analysis

17.1

27.3 C

18

20

22

24

26


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Clear image- critical hotspot:

Analysis

17.1

131.7 C

20

40

60

80

100

120


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Analysis can be done using measuring tools:

Isotherm

or using camera by :

Adjusting thermal tuning

Analysis


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Thermal tuning for span and level can detectlooseness or the source of hotspot.

What is thermal tuning?

Bring the colors of the image on the object of

analysis to maximize color contrast

Note:

- Span is the part within the temperaturerange or thermal contrast

- Level is the middle point of the span

Analysis


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Looseness of bolt and nut (on-site thermal tuning)

Analysis

25.0

32.1 C

25

26

27

28

29

30

31

32


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Looseness of bolt and nut (thermal tuning + Isotherm)

Analysis

17.8

91.7 C

20

30

40

50

60

70

80

90


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Looseness of bolt and nut (thermal tuning)

Analysis

17.8

102.6 C

20

30

40

50

60

70

80

90

100


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Analysis:

Isotherm (universal use to detect the sourceof hotspot)

Analysis


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Isotherm basically were used to detect thesource of hotspot

What is Isotherm?

Replaces certain colors in the scale with acontrasting color. It marks an interval of

equal apparent temperature.

Analysis


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The source of hotspot (using Isotherm)

Analysis

16.8

74.9 C

20

30

40

50

60

70


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Analysis

5.8

306.3 C

50

100

150

200

250

300


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The source of hotspot (using Isotherm but doesnt getclear image-limited analysis)

Analysis

-4.2

121.1 C

0

20

40

60

80

100

120


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The source of hotspot (using Isotherm + palletsrainbow)

Analysis

-4.2

121.1 C

0

20

40

60

80

100

120


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Analysis

30.0

86.5 C

40

50

60

70

80


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Thermographic Process

Analysis

Defect Notification in PMERMS System based on

CMU guideline limits

Thermographic Scanning

Return to

Service

Fail

Pass

Pass FailRescan immediately

after repaired

Return to Service andcontinue operation until

next routine(every 6

Months)

Figure 1.0: Thermographic Flow Chart Diagram

Investigate further

Decision to repair/rectify

made by substation team

based on thermal image

analysis


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To perform analysis for measuring thebehaviour of hotspot before plan therectification to prevent pointlessoutage.

To implement guideline within theTransmission System to prevent failure

on equipment regarding hotspot.

Recommendation &

Conclusion


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Thank You

condition monitoring diagnostic on hotspot at substation

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