Viper-ST® Solid Dielectric, Triple Option Reclosers

Fault Interrupting through 38kV, 800A, 12.5kA symmetrical interrupting. G&W's Viper-ST solid dielectric, triple option recloser combines the time proven reliability of electronically controlled, vacuum fault interrupters with the maintenance-free benefits of a solid dielectric insulated device. The triple option feature offers ultimate user flexibility by permitting three distinct mechanical operation modes, either 1-phase trip / 1-phase lockout, 1-phase trip / 3-phase lockout or 3-phase trip / 3-phase lockout. The Viper -ST provides overcurrent protection for systems through 38kV maximum, 800A continuous current and 12.5kA symmetrical interrupting.

Features:

Reliable Performance - Viper-ST reclosers utilize G&W’s time proven EPOX polymer system to fully encapsulate the vacuum interrupters. This system provides excellent insulation properties while providing fully shielded, void-free construction.
Ease of Operation -The Viper-ST is compatible with the Schweitzer SEL-651R control
Ease of Installation - The Viper-ST is lightweight and compact. Site-ready designs provide all accessories including bracket, arresters and voltage transformers preassembled prior to shipment significantly reducing installation time.
Smart Grid /Lazer Automation - The Viper-ST is automation ready, simplifying conversion for any future automation requirements. A multi-ratio current transformer is encapsulated within the module.
Dead-Line Operation - The unique design of the Viper-ST magnetic actuator system provides for local and remote operation of the recloser in the event that the AC source power is lost or interrupted.
Operation Principle The Viper-ST recloser monitors the circuit using internal multi-ratio current transformers and voltage sensors. The unit is powered by an external 120 VAC or 125 VDC source.

Polemount Center Bracket

Polemount Site-Ready Assembly Preassembly of all auxiliary equipment significantly reduces recloser preparation time for product installation in the field. Includes potential transformers or voltage transformers, arresters, aerial lugs, terminal/junction boxes, wildlife protectors and all associated wiring. Control cables are connectorized on both ends and cut to length for a cleaner installation. User identification markers can be preapplied to each unit prior to shipment further reducing installation time.

Polemount Cluster Bracket

Polemount Horizontal Insulator Bracket This configuration is ideal for overhead applications where all three phase conductors are on the same side of the pole or for congested installations with minimal phase spacing.

Substation Mount Recloser

Padmount Reclosers For applications where space is limited at the substation or where underground feeders require protection, Viper-ST solid dielectric reclosers can provide an ideal solution using a dead-front padmount design. In this configuration, the cable connections can be provided with either a standard IEEE 600A apparatus or 200A deepwell interface for elbow connectors. Separate compartments are provided for accessing the cables and operators. Controls can be mounted directly to the recloser frame or within a separate adjacent enclosure.

Electrical Ratings:

Maximum Design Voltage, kV	15.5	27	38
Impulse level (BIL), kV	110	125	150
Continuous & load break current, A	800	800	800
8-hour Overload, A rms	960	960	960
60Hz Withstand, kV rms One minute (dry) 10 second (wet)	50 45	60 50	70 60
Radio Influence Voltage, microvolts 100 @	9.4kV	16.4kV	23kV
Interrupting Current, kA rms sym.	12.5	12.5	12.5
Making Current, kA asym. rms	20	20	20
Making Current, kA asym. peak	32	32	32
Short Circuit Current, kA sym., 3 second	12.5	12.5	12.5
Mechanical endurance, operations	10,000	10,000	10,000

CONTROL CAPABILITIES The Viper-ST works directly with the popular Schweitzer SEL-651R control. Typical features of the SEL-651R include:

Six voltage inputs necessary for loop scheme designs
Full line metering capabilities using the voltage inputs from the internal sensors
Programming to recognize seasonal loads and shift between three phase and single phase trip/close modes for optimal system efficiency
For loop schemes the control can be programmed to act as a recloser “looking” in either direction
Minimum trip for phase, ground and sensitive earth faults
Capable of up to four shots to lockout
Sequence coordination
Harmonics up to the 15th for the THD analysis
Cold load pickup

CONTROL CONNECTIONS A twist lock style connector makes the cable connection between the control and the interrupter control box. AC power provides the normal supply power to the control.