User's Manual
Table Of Contents
- Table of contents
- 1 Warnings & Cautions
- 2 Notice to user
- 3 Customer help
- 4 Documentation updates
- 5 Important note about this manual
- 6 Parts lists
- 7 Quick Start Guide
- 8 Camera parts
- 9 Screen elements
- 10 Navigating the menu system
- 11 Connecting external devices and storage media
- 12 Pairing Bluetooth devices
- 13 Configuring Wi-Fi
- 14 Handling the camera
- 15 Working with images
- 16 Working with thermal fusion and picture-in-picture image modes
- 17 Working with measurement tools
- 18 Fetching data from external Extech meters
- 19 Working with isotherms
- 20 Annotating images
- 21 Recording video clips
- 22 Changing settings
- 23 Cleaning the camera
- 24 Technical data
- 25 Dimensional drawings
- 25.1 Camera dimensions, front view (1)
- 25.2 Camera dimensions, front view (2)
- 25.3 Camera dimensions, side view (1)
- 25.4 Camera dimensions, side view (2)
- 25.5 Camera dimensions, side view (3)
- 25.6 Infrared lens (30 mm/15°)
- 25.7 Infrared lens (10 mm/45°)
- 25.8 Battery (1)
- 25.9 Battery (2)
- 25.10 Battery (3)
- 25.11 Battery charger (1)
- 25.12 Battery charger (2)
- 25.13 Battery charger (3)
- 25.14 Battery charger (4)
- 26 Application examples
- 27 Introduction to building thermography
- 27.1 Disclaimer
- 27.2 Important note
- 27.3 Typical field investigations
- 27.3.1 Guidelines
- 27.3.2 About moisture detection
- 27.3.3 Moisture detection (1): Low-slope commercial roofs
- 27.3.4 Moisture detection (2): Commercial & residential façades
- 27.3.5 Moisture detection (3): Decks & balconies
- 27.3.6 Moisture detection (4): Plumbing breaks & leaks
- 27.3.7 Air infiltration
- 27.3.8 Insulation deficiencies
- 27.4 Theory of building science
- 27.4.1 General information
- 27.4.2 The effects of testing and checking
- 27.4.3 Sources of disruption in thermography
- 27.4.4 Surface temperature and air leaks
- 27.4.5 Measuring conditions & measuring season
- 27.4.6 Interpretation of infrared images
- 27.4.7 Humidity & dew point
- 27.4.8 Excerpt from Technical Note ‘Assessing thermal bridging and insulation continuity’ (UK example)
- 28 Introduction to thermographic inspections of electrical installations
- 28.1 Important note
- 28.2 General information
- 28.3 Measurement technique for thermographic inspection of electrical installations
- 28.4 Reporting
- 28.5 Different types of hot spots in electrical installations
- 28.6 Disturbance factors at thermographic inspection of electrical installations
- 28.7 Practical advice for the thermographer
- 29 About FLIR Systems
- 30 Glossary
- 31 Thermographic measurement techniques
- 32 History of infrared technology
- 33 Theory of thermography
- 34 The measurement formula
- 35 Emissivity tables
The two left phases are considered as normal, whereas the right phase shows a very
clear excess temperature. Actually, the operating temperature of the left phase is
+68°C (+154°F), that is, quite a substantial temperature, whereas the faulty phase
to the right shows a temperature of +86°C (+187°F). This means an excess temper-
ature of +18°C (+33°F), that is, a fault that has to be attended to quickly.
For practical reasons, the (normal, expected) operating temperature of a component
is taken as the temperature of the components in at least two out of three phases,
provided that you consider them to be working normally.. The ‘most normal’ case is
of course that all three phases have the same or at least almost the same temperature.
The operating temperature of outdoor components in substations or power lines is
usually only 1°C or 2°C above the air temperature (1.8°F or 3.6°F). In indoor substa-
tions, the operating temperatures vary a lot more.
This fact is clearly shown by the image below as well. Here the left phase is the one,
which shows an excess temperature. The operating temperature, taken from the two
‘cold’ phases, is +66°C (+151°F). The faulty phase shows a temperature of +127°C
(+261°F), which has to be attended to without delay.
10713503;a5
Figure 28.9 An infrared image of indoor electrical equipment (2).
28.3.5 Classification of faults
Once a faulty connection is detected, corrective measures may be necessary—or
may not be necessary for the time being. In order to recommend the most appropriate
action the following criteria should be evaluated:
■ Load during the measurement
■ Even or varying load
■ Position of the faulty part in the electrical installation
■ Expected future load situation
■ Is the excess temperature measured directly on the faulty spot or indirectly through
conducted heat caused by some fault inside the apparatus?
Publ. No. T559597 Rev. a554 – ENGLISH (EN) – September 27, 2011 137
28 – Introduction to thermographic inspections of electrical installations