By Trevor Lord and Graham Hodge (Issue 1 and 2) Updated by Trevor Lord 2023 Lord Consulting

Corona activity on or near MV/HV insulators and lines has now been recognised as one of the single most destructive mechanisms faced by the Power Industry, demanding a suitable understanding and response.
Corona imaging, via Corona Camera technology, creates an electronic image of corona discharge activity using UV light generated by the impact of excessive electric field stress on air. The technology has proven itself to be extremely useful. It is now a ‘best practice,’ commissioning, management, and diagnostic tool for network operators concerned with optimising the life and operational reliability of their MV/HV insulation system components.
This paper examines the nature of the corona mechanism, its adverse impact on MV/HV insulator and line assets, the current state of corona discharge imaging technologies for high voltage electrical power networks, and the application of such technologies toward mitigating the challenges caused by corona activity.

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For the past 23 years, LORD Consulting has developed and applied its own IP in the discipline of well implemented on-line main tank DGA monitoring to clients Australasian-wide, with excellent success in the overall risk minimisation to strategic transformers.

Although there is a wide range of devices offered as ‘transformer DGA monitors’ they are by no means equal in capability or performance. Certain devices marketed today are unsuited to the role and this should concern our Industry. It is truly a case of ‘buyer beware’ and, here too, the old adage ‘you get what you pay for’ very much applies to the purchase and successful deployment of these devices.

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In This Issue

• Protective System Maintenance Program
• Transmission Line Loadability
• Generator Loadability
• Relay Performance during Stable Power Swings
• Coordination for Performance during Fault

The next ASPEN OneLiner class is just a month away. This two-and-a-half day class will cover all aspects of the OneLiner software, from beginning to advanced. Please see the panel below for details.

There are only about 10 seats left. If you plan to come, I suggest you sign up on-line and reserve your hotel room as soon as possible.

I hope to see you there.

Sincerely,

Sherman Chan

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The DC-3VA is specifically designed to accurately monitor one or two DC voltage channels, 1V to 300Vdc and one DC current channel.

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Relay Loadability Studies

Reliability Standard PRC-023, enacted by FERC in 2010, requires transmission owners, generator owners, and distribution providers to set their phase relays in such a way that the relays protect the electric network from short circuits, but do not limit transmission loadability or interfere with system operators’ ability to maintain system reliability.