G&W 1-3-2 Viper®-ST Recloser

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Viper®-ST Recloser

G&W Electric’s Viper^®-ST independent pole operated (IPO) recloser combines the time proven reliability of electronically controlled, vacuum fault interrupters with the maintenance-free benefits of a solid dielectric insulated device. The IPO 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, up to 1000A continuous current, with 12.5kA symmetrical interrupting and 16kA symmetrical interrupting up to 27kV. Vertical insulator “L” configurations and horizontal insulator “Z” configurations are available to increase installation flexibility.

Features and Benefits

Reliable Performance – Viper^®-ST reclosers utilize G&W Electric’s time-proven epoxy 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 SEL-651R control along with a variety of other control options upon request.

Ease of Installation – The Viper^®-ST is lightweight and compact. Site-ready designs provide all accessories preassembled prior to shipment, significantly reducing installation time.

Power Grid Automation Ready – The Viper^®-ST is automation ready, simplifying conversion for any future automation requirements.

Dead-Line Operation – The unique design of the Viper^®-ST magnetic actuator system provides for local and remote operation of the recloser on battery backup in the event that the AC source power is lost or interrupted.

Voltage & Current Sensing – The Viper^®-ST recloser has up to 6 internal voltage sensors and 3 dual-ratio current transformers for current sensing.

Configuration Details

Polemount Center Bracket
Polemount Alley-Arm Bracket
Polemount Complete Site-Ready Assembly
Polemount Cross-Arm Bracket
Polemount Cluster Bracket
Polemount Phase-over-Phase Bracket
Substation Mount Recloser
Padmount

Electrical Ratings Chart for Viper®-ST

Maximum Design Voltage, kV	15.5		27		38
Impulse level (BIL), kV	110	110	125	125	150
Continuous & load break current, A	800	800	800	800	800
8-hour Overload, A rms at 20°C	960	960	960	960	960
60Hz Withstand, kV rms
- - - One minute (dry)	50	50	60	60	70
- - - 10 second (wet)	45	45	50	50	60
Radio Influence Voltage, microvolts @ 100	9.4kV	9.4kV	16.4kV	16.4kV	23kV
Interrupting Current, kA rms sym.	12.5	16	12.5	16	12.5
Making Current, kA asym. rms	20	25	20	25	20
Making Current, kA asym. peak	32	42	32	42	32
Short Circuit Current, kA sym., 3 second	12.5	16	12.5	16	12.5
Mechanical endurance operations	10,000	10,000	10,000	10,000	10,000
Temperature range	-60°C to +65°C	-60°C to +65°C	-60°C to +65°C	-60°C to +65°C	-60°C to +65°C
Continuous Current	800A*	800A*	800A*	800A*	800A*
*Consult factory for higher continuous current up to 1000A

Ratings Chart for GNI Switches

Voltage Class, (kV)	15kV	25kV	35 kV
Maximum design voltage (kV)	15.5kV	27kV	38kV
BIL Impulse (kV)	110kV	125kV	150kV
1 Min Withstand AC (kV)	35kV	60kV	70kV
1 Min Withstand Production test rating AC (kV)	34kV	40kV	50kV
15 Min Withstand DC (kV)	53kV	78kV	103kV
Continuous and load break current (A)*	630 amps	630 amps	630 amps
Momentary Current (kA) asym	40kA asym	40kA asym	40kA asym
Fault-Close 3-times (kA) asym	40kA asym	40kA asym	40kA asym
1 Sec Current (kA) sym	25kA asym	25kA asym	25kA asym
Mechanical Operations	2000	2000	2000
Symmetrical interrupting ratings (kA)**	25	25	25
*900A continuous available
**12.5kA and 20kA available