Testing is an essential activity in any engineer’s career. Whatever your role in industry (electrical designer, purchase engineer, manufacturer, installation contractor or maintenance engineer) a solid knowledge of tests to be carried out on a given piece of electrical equipment and interpretation of results obtained is a necessity. This workshop is designed to familiarise you with various aspects of testing general electrical equipment and high voltage testing in particular. Examples will be cited from various international standards regarding the procedure for conducting of tests and interpreting the test results. The need for keeping proper records of tests conducted both in the initial stages and later during routine maintenance will be discussed. Some of the tests are too complex to be performed on a routine basis or may require specialised equipment which may not be normally available to user industries or even manufacturers. This is where the services of an independent and accredited test lab is useful. The role of such labs will be briefly discussed. WHO SHOULD ATTEND? Building service designers Consulting engineers Control engineers Data systems planners and managers Electrical engineers Electrical technicians Instrumentation engineers Instrumentation technicians Maintenance engineers Power system protection engineers Project engineers MORE INFORMATION: http://www.idc-online.com/content/practical-medium-high-voltage-testing-electrical-equipment-engineers-and-technicians-48

1. Practical Medium & High Voltage Testing of Electrical
Equipment for Engineers & Technicians
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2. TODAY’S ELECTRICAL SYSTEM
• Power transmitted and distributed at different voltages in every
country
• Transformers help transmission and distribution at different
voltages
• This has led to requirement of electrical equipment at different
voltages
• Common demarcation: Low Voltage (LV), Medium Voltage
(MV) and High Voltage (HV) systems.
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3. Typical HV/MV electrical network
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4. HIGH VOLTAGE EQUIPMENT
These are used in:
• Power generating stations evacuating generated power at
110 kV up to around 800 kV
• Intermediate substations established to help in flexibility
and to provide alternate feeds in distribution
• Receiving substations in power intensive industries using
captive power plant and loads up to around 100 MVA.
Generally limited to less than 275 kV.
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5. MEDIUM VOLTAGE EQUIPMENT
They are used in:
• Industries with Power demands not exceeding 30 to 50
MVA (Can be lower in some parts)
• Receiving substations of major townships and commercial
complexes
• Generating power stations with generators voltage limited
to around 24 kV
• Small substations of utility companies for localized
distribution and changeover
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6. COMMON HV/MV EQUIPMENT
• Circuit Breakers – HV and MV
• Air break switches (also called
isolators/disconnectors) – HV and MV
• Instrument transformers (CTs, PTs, etc) –
HV and MV
• Cables (limited to around 170 kV) – HV and
MV
• Transformers – HV and MV
• Lightning arrestors – HV and MV
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7. COMMON MV EQUIPMENT
• Generators
• Synchronous motors
• Induction motors
• Switchgear panels
• Bus ducts
• Capacitors
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8. NEED FOR TESTING
• Necessity to prove the performance before putting into
service
• Evolution of standards for HV/MV electrical equipment
• Globalization resulting in common methods to assess the
performance of equipment from different manufacturers
of different countries
• To give confidence about performance and safety to the
end user before acceptance
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9. PURPOSE OF TESTING
• Finished product includes many components
independently tested and need final tests once
assembled
• All parts not visible hence need for a common
method to check capability under actual working
conditions
• Base line test results used as basis for future
comparisons of performance
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10. TEST CATEGORIES
Factory tests
• Type tests/Design tests
• Routine tests
• Sample tests
• Special tests
• Acceptance tests
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11. TEST CATEGORIES
Field tests
• Pre-commissioning tests
• Commissioning tests
• Maintenance tests
• Tests after replacement/repair
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12. VARIATIONS TO BE CONSIDERED
• Test voltages and results to be corrected for
climatic conditions:
– Altitude above sea level
– Ambient temperature
– Humidity
• Tolerances on test results
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13. ALTITUDE
• Air as insulating medium with separation
based on operating voltages
• Increase in location altitude decreases the
dielectric properties of air
• Normal test results satisfy equipment used in
altitudes up to 1000 meters above sea level
• Beyond this level de-rating required –
alternatively use equipment rated for slightly
higher voltage.
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14. TEMPERATURE
• Ambient temperature generally limited to 40ºC
• Temperature rise generally measured based on this
ambient temperature
• Losses and some performance details corrected to
75ºC to reflect the actual operating temperature.
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15. TOLERANCES
• Not applicable for all test values and test
measurements
• Generally the equipment shall withstand the
test voltages specified without tolerance
• Losses, impedance values, etc are design
related and based on many factors – standards
allow tolerances for these values
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16. DO YOU WANT TO KNOW MORE?
If you are interested in further training or information,
please visit:
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