Medium Voltage Control Power Transformers

Medium Voltage Control Power Transformers (CPTs) are single-phase dry-type transformers used to supply control power in medium voltage switchgear and transformers. They have open construction with an epoxy resin encapsulated coil. Power ratings of 5, 10 and 15kVA with nominal primary voltages range from 2.4kV to 15kV and secondary voltages typically are configured for 120/240V (series parallel) operation. It is supplied with three +/-2.5% taps above and below nominal voltage on the primary winding. For low power losses, the magnetic core is wound with grain-oriented electrical steel, and the high-voltage coil is vacuum encapsulated in epoxy resin. In addition to protecting the coil from moisture and foreign particulate matter, the resin epoxy provides a higher ability to withstand mechanical forces during short-circuits, than standard varnished Vacuum Pressure Impregnation (VPI) or "dip in varnish and then bake" process.

Medium Voltage Power Transformers Product features

• Standard sizes: 500VA to 5kVA. Custom sizes may be available.
• 180°C (356°F) insulations system, 115°C (239°F) temperature rise under full load
• 25kV BIL for primary voltages up to 5kV, 35kV BIL for primary voltages over 5kV to 7.2kV
• Standard 48″ leads on primary, terminal block connections on secondary
• 50 Hz and 60 Hz designs available

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