Voltage transformers: why modern CVTs don't drift

Article Abstract:

The design of capacitive voltage transformers (CVTs) ensures steady dielectric constant and electrode distance thus minimizing drift potential. Electromagnetic units and series coupling capacitors comprise CVTs, which are less expensive, more versatile, and more reliable than wound voltage transformers.

Innovations, Equipment and supplies, Power electronics

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Monitor clamping pressure with vibro-acoustics

Article Abstract:

Transformer maintenance methods are described, including how to monitor clamping pressure. Since 1994, of 430 transformers tested by engineers, 59 were deemed critical. Repair crews found a correct diagnosis in 85% of these transformers.

Clamping circuits

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Avoid overexciting power transformers

Article Abstract:

Overexcitation of power transformers that have not been operated within the maximum voltage standards can lead to failure. Overexcitation can be avoided through the proper set-up of a transformer's tap.

Transformers, except electronic

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