Indoor and outdoor current and voltage transformers organized by installation environment, electrical duty and physical interface.
Choose the installation environment first, then define the current-transformer, voltage-transformer or combined measurement requirement.
IndoorIndoor Instrument TransformersCurrent transformers and voltage transformers for switchgear, enclosed distribution equipment and indoor measurement or protection duties.
OutdoorOutdoor Instrument TransformersCurrent transformers, voltage transformers and combined transformer arrangements for exposed distribution and metering applications.Confirm the transformer duty, electrical specification and installation envelope together. These five inputs establish the correct review path before model matching begins.
Choose the project situation first. Each route defines what to provide and what the engineering review can return.
Application duty, electrical and dimensional references, and available production or test evidence are reviewed in one sequence before a transformer is specified for the project.
The CT, VT or combined duty, installation environment and primary-system requirement are organized before model review begins.
Transformer type, application duty and source specification
Ratio, burden, accuracy, core or winding function, terminal arrangement and mounting dimensions are checked against the supplied reference.
Electrical schedule, outline dimensions and terminal reference
Applicable production records and the agreed electrical test scope are reviewed with the product identification before release.
Product identity and applicable ratio, accuracy, polarity or excitation record
These answers clarify the CT and VT selection data, installation checks and RFQ inputs that should be confirmed before a transformer is specified.
Specify a CT when the secondary circuit needs a scaled current signal for metering or protection, and a VT when it needs a scaled voltage signal. For either type, the selected duty, primary and secondary values, accuracy requirement, burden and installation interface must be confirmed together.
Provide the primary and secondary current ratio, metering or protection duty, rated burden, accuracy class, number of cores, system voltage and insulation requirement, frequency, primary conductor or terminal arrangement, and indoor or outdoor installation. Include the secondary wiring or relay burden when it is known.
Provide the primary and secondary voltage, connection arrangement, frequency, metering or protection duty, burden, accuracy class, insulation level, terminal arrangement and installation environment. Confirm the required secondary circuit and any project drawing before a model is specified.
Not necessarily. A matching ratio does not establish the required burden, accuracy class, core or winding purpose, insulation level, terminal arrangement or mounting interface. For protection applications, the specified protection performance must also be reviewed against the actual scheme.
Start with the real installation environment and equipment position. Indoor models must suit the enclosed switchgear interface and clearances; outdoor models must suit the specified external installation, insulation arrangement and environmental conditions. Do not select by product appearance alone.
Include the existing nameplate or model, CT, VT or combined duty, ratio, burden, accuracy class, number of cores or windings, system voltage, terminal or polarity reference, overall and mounting dimensions, indoor or outdoor installation, quantity and required documents. Attach the outline drawing or clear photos where available.
