Air switch interrupter attachments for sectionlizing transmission loops, loop splitting and line charging current interruption

Click on photo for graphical representation

The Joslyn Load Sectionalizing Interrupter (LSI) converts isolating switches to provide interrupting capability for sectionalizing transmission loops, loop splitting and line charging current interruption. The LSI minimizes the possibility of a switching error as sequential switching of a loop system is eliminated, thereby improving personal safety and increasing system flexibility. The unique design automatically determines the required function and inserts the proper interrupter into the power circuit.

LSIs can be applied to disconnect switches rated 69kV through 161kV. They can be supplied, mounted, and preadjusted on Joslyn isolating switches to provide a complete interrupter switch. Conversion of an existing air switch is easily achieved since no special tools or training is required.


	Maintenance-Free
	Long life of 5,000 operations.
	Ease of Installation
	Three phase sets can be installed quickly and easily in approximately 4 hours.
	Rugged Construction
	Anodized aluminum mechanism housing protects against corrosive action and sealed vacuum interrupter chamber is sealed against moisture, ultraviolet activity, and contamination.
	Proven Performance
	Installations of more than 35 years demonstrate the reliability and proven performance of the interrupter.
	Air Switch Ratings Unaffected
	The continuous, momentary, and impulse ratings of the switch are unaffected since the LSI is in the power circuit for a few seconds.

Loop Switching/Parallel Switching
System Voltage (kV)	Interrupting Current (Amperes)	Maximum Peak Recovery Voltage (kV)
69-230	2000	30

Line Dropping and Cable Switching Ratings
System Voltage (kV)	Approximate Line Length (Miles)	Current ( Amperes)
69	70	15*/20
115	50	20
138	30	15
161	20	10

* with Voltage Limiter Attachment

Transformer Magnetizing Switching Ratings
System Voltage (kV)	Transformer Size (MVA)
69	70
115	110
138	150
161	200
230	300

	Ordering Information
1	Specify air switch manufacturer
2	Supply switch model number
3	Specify voltage and current rating
4	Indicate size of insulator bolt circle
5	Describe blade movement including rotation as viewed from hinge end
6	Specify application, system voltage and grounding

Joslyn Hi-Voltage Royce Thompson Fisher Pierce