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Dielectric Frequency Response in Measuring Moisture in Power Transformers

References include IEEE C57.12.00 Table 18; C57.12.90 Test Code for Class I up to 60 kV and larger Class II Transformers.

Factory testing reviewed including discussion on raising test frequencies to avoid saturating core steel during Induced Test and using Static Frequency Converters (SFCs) instead of rotating machines (M-G sets).

DC tests for Winding Resistance, charges the coil and core, measures and discharges and must be de-magnetized after testing.
Resistance values used for I2R Load Loss data.

Reviewed IEEE C57.152 – Field Testing & Commissioning Guide
and importance of Temperature Correction of resistance values.
Temperature Correction formulas are standard and accepted for resistance values.
Note: this is not true for Insulation Power Factor (PF) values.
There is no standard accepted Temperature Correction formula or tables
for PF testing.
This is highlighted in IEEE C57.12.00 and C57.12.90 and C57.152.

Reviewed improvements in test and measurements due to advances in power electronics; specifically Variable Frequency.
Static Frequency Converter (SFC) – for power induced tests
Dielectric Frequency Response (DFR) – assessing moisture content in Insulation; IEEE Guide is being developed, C57.161/Draft 2

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Normandy Machine Company – Maximize Asset Performance for Power Transformers

Normandy Machine Company offers options in managing and maintaining critical Power Transformer Assets by extending the life of Load Tap Changers in offering LTC Core Exchange Services and Field Service Kits. Re-manufactured LTC Assemblies are available, many IN STOCK,...
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Why Perform Maintenance & Testing on Electrical Equipment?

The value of Maintenance is always questioned. Fundamentally, though, it reflects a quality organization, committed to employee safety and operational integrity.

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Standard for Shielded Power Cable Diagnostic Testing Methodologies

The advancement and evolution of the development and use of Partial Discharge as the technology to monitor and alarm the insulation integrity of both electrical power apparatus, accessories and the entire power systems’ Assets continues to gain credibility, accuracy and reliability. The ability to monitor an Owner’s Assets of this significance; continuously, without outage interruption has enormous value – is self-evident.

Continue

US installs over 14.6 GW of solar in record year

EXECUTIVE SUMMARY   Solar installations double over 2015 levels with non-residential Utility and Independent Power Producers outpacing Residential for the first time since 2011. 40 GW is on-line. What are the availability percentages of Wind? What would the...
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Renewable Energy Stats Compelling

A precious Letter to a senior policy manager at Scotland Renewables is worth the read.

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News, Knowledge and Monkey Business

Industry news and technical articles balanced with a little levity.

Dielectric Frequency Response in Measuring Moisture in Power Transformers

References include IEEE C57.12.00 Table 18; C57.12.90 Test Code for Class I up to 60 kV and larger Class II Transformers.

Factory testing reviewed including discussion on raising test frequencies to avoid saturating core steel during Induced Test and using Static Frequency Converters (SFCs) instead of rotating machines (M-G sets).

DC tests for Winding Resistance, charges the coil and core, measures and discharges and must be de-magnetized after testing.
Resistance values used for I2R Load Loss data.

Reviewed IEEE C57.152 – Field Testing & Commissioning Guide
and importance of Temperature Correction of resistance values.
Temperature Correction formulas are standard and accepted for resistance values.
Note: this is not true for Insulation Power Factor (PF) values.
There is no standard accepted Temperature Correction formula or tables
for PF testing.
This is highlighted in IEEE C57.12.00 and C57.12.90 and C57.152.

Reviewed improvements in test and measurements due to advances in power electronics; specifically Variable Frequency.
Static Frequency Converter (SFC) – for power induced tests
Dielectric Frequency Response (DFR) – assessing moisture content in Insulation; IEEE Guide is being developed, C57.161/Draft 2

Standard for Shielded Power Cable Diagnostic Testing Methodologies

The advancement and evolution of the development and use of Partial Discharge as the technology to monitor and alarm the insulation integrity of both electrical power apparatus, accessories and the entire power systems’ Assets continues to gain credibility, accuracy and reliability. The ability to monitor an Owner’s Assets of this significance; continuously, without outage interruption has enormous value – is self-evident.