A medium voltage indoor current transformer (CT) steps down primary current to a standardised secondary value, typically 1A or 5A, so that protection relays and energy meters can measure and respond to it safely. It is a core component of indoor switchgear in medium voltage distribution networks.
Straton's Medium Voltage Current Transformers use resin cast construction, in which the winding assembly is encapsulated in epoxy resin for high dielectric strength and stable insulation in indoor conditions. They are designed and tested to IEC 61869-1 & 2 / IS 16227 and fit directly into switchgear panels in utility substations and industrial installations.
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NABLStraton's MV CT specifications cover a range of indoor CT variants across medium voltage transformer models, engineered for reliable metering and protection performance.
Indoor 11kV class resin cast CT, designed and tested to IEC 61869-1 & 2 / IS 16227. Used for metering and protection in 11kV switchgear panels across utility substations and industrial installations.
Download Technical DatasheetIndoor 33kV class wound type resin cast CT, designed and tested to IEC 61869-1 & 2 / IS 16227. It belongs to Straton's wound-type range (5A to 2500A primary), and the model-specific range is given in the datasheet. Used for metering and protection in 33kV utility substations, metering panels, and solar and wind farm substations.
Download Technical DatasheetIndoor 11kV class wound type resin cast CT, designed and tested to IEC 61869-1 & 2 / IS 16227. It belongs to Straton's wound-type range (5A to 2500A primary), and the model-specific range is given in the datasheet. The primary winding is wound around the core, suiting precise metering and protection in 11kV switchgear panels.
Download Technical DatasheetIndoor 11kV class wound type resin cast CT, designed and tested to IEC 61869-1 & 2 / IS 16227. It belongs to Straton's wound-type range (5A to 2500A primary), and the model-specific range is given in the datasheet. Used for metering and protection in 11kV distribution panels and industrial switchgear.
Download Technical DatasheetEach variant is a MV Resin Cast Current Transformer, available in Wound or Window/Ring type construction for indoor installation, designed and tested per IEC 61869-1 & 2 / IS 16227.
Straton, trusted Instrument Transformer Manufacturers, builds its MV Indoor Current Transformer range around the following features:
Every Straton MV indoor CT undergoes routine testing, including partial discharge measurement, in our in-house test facility. Type tests are certified by CPRI, and our laboratory is NABL accredited.
Straton's MV Indoor Current Transformers are deployed across utility substations, power distribution panels, industrial switchgear, EPC infrastructure projects, and solar and wind farm substations, supporting reliable metering and protection wherever indoor current sensing is required.
Utility substations: metering and protection at 11kV and 33kV
Switchgear panels: direct integration with protection relays and metering panels
EPC infrastructure projects: matched CT and VT supply for MV panels
Solar and wind farm substations: metering and protection for power evacuationFor indoor installations spanning the LV segment, Straton's Low Voltage Current Transformers for Indoor Applications complement this MV Indoor range, giving you a matched current-sensing solution across voltage classes within the same facility.
Contact our engineering team for technical support, product selection, and customised specifications.
