The SEL-SCT is designed for applications where it is difficult or uneconomical to open the primary conductor to install a solid-core-type CT. The separable-core design allows the SEL-SCT to be opened to the nominal window diameter and installed over bushings or cables without interrupting the connection. SEL-SCTs are held in place with cable ties. A submersible design option provides reliable use in subsurface vaults where flooding can occur.
The SEL-SCT is encapsulated in flexible vinyl plastic with 600 V-class insulation. It consists of a separable two-part assembly. The SEL-SCT base and body can be pulled apart, placed around a cable, and reconnected. Two included stainless steel worm gear clamps secure the base and body of the current transformer while also preventing water intrusion into the core.
Volume pricing is available.
Subsurface Vault Feeder Monitoring—Use the SEL-SCT in conjunction with an SEL relay, like the SEL-787 Transformer Protection Relay, and an SEL-3060 Ethernet Radio to wirelessly send feeder data to a SCADA system or distribution management system (DMS) or for engineering support. Build an economical system to monitor loads, detect overload conditions, and capture pre- and post-event data.
Load Current and Overcurrent Sensing—Apply SEL-SCTs to serve as an input for source transfer relays. Use SEL-SCTs to distinguish fault current from load current to prevent switching into a fault.
Wet Environment Submetering—Use SEL-SCTs to submeter equipment within wet environments, including water treatment plants, pulp and paper mills, and other environments subject to water and extreme humidity.
|Burden Range||6.25 and 4,000 VA|
|CT Ratio Range||600:5 and 4800:1|
|Accuracy Range||3% to 5%|
|Accuracy at % Current Range||3% to 5%|
|600 V Class||Yes|
|Window Diameter||3.5" (rectangular)|
|Locking Mechanism||Worm gear clamps|
|Leads Included||Yes (option)|
|Shorting/Protection Included||Yes (option)|
The Firmware IDs for older versions of the firmware can typically be found in Appendix A of the instruction manual.