Start with the core and ratio
State whether the item is a current transformer, potential transformer or another instrument-transformer arrangement. Copy the rated primary and secondary values, frequency and class exactly as marked. For a multi-core CT, identify the core and terminals concerned. For a tapped item, list each ratio that needs a result.
An instrument used for metering and one used for protection can have different assessment requirements. Provide the applicable specification and the results your team needs, such as ratio error or phase displacement. A request to confirm a marked class needs the required test conditions reviewed before acceptance.
Specify the burden and working points
Include the burden and power factor associated with each requested comparison, where specified by your procedure. Give the current or voltage points in the same schedule. If the request concerns the installed measuring chain, identify the connected meter, wiring and other components that the result must cover.
A transformer turns ratio meter is a separate test instrument. If that is the item being sent, use its own model and enquiry details. For a CT or PT, RTS will first review the configuration, requested measurements and whether the item can be handled at the proposed location.
Arrange release with the electrical team
Give the bay or panel designation and the responsible electrical contact. Leave isolation, disconnection and access to the authorised site team. For a loose instrument transformer, confirm its dimensions, weight, terminal protection and return destination before dispatch. Keep each core or tap designation with the asset number on the order.
CT analyzers as test equipment
A CT analyzer is the measuring system used to assess a current transformer; it needs its own instrument record. List the functions required, such as ratio, phase, excitation or winding-resistance results, and supply the fitted options. Keep the analyzer's verification request separate from a report on a customer's CT. RTS must review the manufacturer's procedure and reference requirements before agreeing which analyzer functions can be accepted.