Loadbreak Interrupter

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Joslyn Load Interrupter Catalogue

Increase the capability of your disconnect switches by adding Joslyn Hi-Voltage® load interrupter attachments to expand the versatility for loop sectionalizing, line dropping, load breaking and transformer-magnetizing current interruption. The value of this added capability is increased operational efficiency and flexibility, as well as reduced number of circuit breaker operations and/or investment. Additionally, devices that provide multiple functions on a single switch, such as the Joslyn Hi-Voltage® Series LSI Load Sectionalizer Interrupter, which provides both loop splitting and line dropping, increase personnel safety because they can eliminate switch misoperation.

Joslyn Hi-Voltage® load interrupter attachments do not in any way reduce the rating of the disconnect switch, nor do they violate the coordinated open gap design of the switch. Joslyn Hi-Voltage® interrupter attachments include custom-designed mounting brackets and arc horns to ensure that interrupters are properly transitioned into the circuit when the disconnect switch opens. In addition, the arc horns are designed to withstand the prestrike developed upon closing of the switch. Josly Hi-Voltage® load interrupter attachments are designed for a 30-year life and can be operated 5000 times without any maintenance.

High Velocity Whip

Ths device stores energy in the spring rod and in the coil spring inside the aluminum housing. The stored energy in the spring rod is added to the energy stored in the coil spring at the instant the spring rod separates from the latch. The parting velocity is 22″ (558mm) per cycle. This allows the Series HVI to be the highest rated device in this category. Application include interruption of the line charging current up to 161 kV and transformer-magnetizing current up to 230 kV.

Economical attachments for air switches mount quickly on most gear – or motor-operated vertical – and side-break switches, enabling affordable conversion of existing air switches.
Install on the air switch’s existing hardware – no special tools or training required.
Reliable operation.
Interruption reliability is not dependent upon switch opening speed.
Virtually maintenance-free; requires only an inspection every five years or 5000 operations.
Unique design ensures proper operation at all times, and air switches equipped with Series HVI Interrupters have operated dependably in the field for many years.
Interrupting performance far exceeds the capabilities of quick-break attachments of more conventional design.
Mount on almost any vertical – or side-break horn gap air switch equipped with 3″ or 5″ bolt circle insulators and a manual gear or motor-operated mechanism.

RATINGS
Loop Dropping and Cable Switching
System Voltage (kV)	96	115	138	161	230
Approximate Line Length (miles)	70	50	30	20	—–
Current (Amps)	20	20	15	10	0.5
Transformer-Magnetizing Switching
System Voltage (kV)	96	115	138	161	230
Transformer Size (MVA)	70	100	150	200	300

Universal Vac-Rupter

This device used one vacuum interrupter per phase. The vacuum interrupter is inserted into the circuit when the disconnect switch is opened. Once the switch blade is sufficiently away from the switch jaw, the vacuum contacts separate and interrupt the circuit. Specially designed arcing horns are designed to handle prestrikes upon closing of the switch. Applications include 2000A load breaking up to 34.5 kV for solidly grounded systems and parallel switching up to 230 kV.

Add the Joslyn Hi-Voltage® Voltage Limiter (V/L) Attachment to interrupt line charging current of 15A up to 69kV.

Quick and affordable conversion of existing switches.
Mount quickly on most group-operated isolating switches, including vertical-break, side-break, double-side break, center-side break and in-line designs, in all configurations including phase-over, with no special tools or training required.
May be used for full load interruption up to 34.5kV.
May also be used for reduced recovery voltage applications of loop splitting or parallel switching up to 230kV, depending on system voltage, grounding of system and load and load characteristics.
Optional voltage limiter expands capability for transmission line charging current and transformer-magnetizing current interruption at voltages up to 72.5 kV, in addtiona to providing 2000 of loop splitting or parallel switching capability.
Virtually maintenance-free; requires only an inspection every five years or 5000 operations.
Anodized aluminum mechanism housing protects against corrosive action.
Fiberglass interrupter module housing with special coating inhibits ultraviolet activity.
Sealed vacuum interrupter chamber is encapsulated in Joslyte solid-dielectric, closed-cell insulation to seal against moisture and contamination.
Current-transfer and acring horn components are made from special non-welding, high-current materials.
The Series UVI Interrupter is in the power circuit only for a few seconds during the opening operation; it is not in the circuit while the switch is closing or closed, and continuous momentary and impulse ratings of the switch are unaffected.
Reliable operation – a spring toggle mechanism opens the vacuum contacts at the proper speed, independent of air switch operation.
External spark gap protects vacuum module if operated above its recovery voltage capability.

Load Sectionalizer

The Series LSI combines both the Series HVI and Series UVI devices into one system. The interrupter automatically determines which device will be providing the interruption with a preset latch/spark gap assembly.

Eliminate sequential switching of a loop system, which minimizes the possibility of a switching error, thereby increasing personnel safety and system operating flexibility.
Can be supplied mounted and pre-adjusted on Joslyn Hi-Voltage® isolating switches to provide a complete, single-source interrupter switch.
Also available as an add-on for existing switches – can be applied easily and economically to existing vertical – break or side – break disconnect switches rated 69kV through 161kV, regardless of manufacturer.
69kV Series LSI with Voltage Limiter is ideally suited for additional switch types including center-break and in-line designs.
Virtually maintenance-free; requires only an inspection every five years or 5000 operations.
Anodized aluminum mechanism housing protects against corrosive action.
Fiberglass interrupter module housing with special coating inhibits ultraviolet activity.
Sealed vacuum interrupter chamber is encapsulated in Joslyte solid-dielectric, closed-cell insulation to seal against moisture and contamination.
Current-transfer and acring horn components are made from special non-welding, high-current materials.
The Series LSI Interrupter is in the power circuit only for a few seconds during the opening operation; it is not in the circuit while the switch is closing or closed, and the continuous momentary and impulse ratings of the switch are unaffected.
Spring toggle mechanism opens the vacuum contacts at the proper speed, independent of air switch operating time.
External spark gap protects vacuum module if operated above its recovery voltage capability.

RATINGS
Loop Splitting/Parallel Switching
69-230kV: Maximum Interrupting current 2000 A – Maximum recovery voltage 30kV peak
Line Dropping and Cable Switching
System Voltage (kV)	69	115	138	161	230
Approximate Line Length (miles)	70	50	30	20	—–
Current (Amps)	20 (15*)	20	15	10	0.5
Transformer-Magnetizing Switching
System Voltage (kV)	69	115	138	161	230
Transform Size (MVA)	70	100	150	200	300

*Rating using Voltage Limiter instead of HVI.

Modular Vac-Rupter

This device uses up to eight vacuum interrupters in series per phase for 230 kV systems. The vacuum interrupters are insterted into the circuit when the disconnect switch is opened. Once the switch blade is sufficiently away from the switch jaw, the vacuum contacts separate and interrupt the circuit. Specially designed arcing horns handle prestrikes upon closing of the switch. Applications include 2000A load breaking, line charging current interruption and parallel switching up to 230 kV.

Consist of one or more vacuum interrupter modules connected in series to form an interrupter assembly to be installed on a disconnect switch to provide load switching capability.
Supplied complete with all mounting hardware, enabling fast and easy installation on most vertical-break disconnect switches from any manufacturer.
Available with Joslyn Hi-Voltage® Series RF-2 Vertical Break Switches to provide a complete load interrupter switch package.