Product Description
thCOMPONENTS OF THE GW9 SWITCH
1. By-pass Studs ( Optional)
Two copper alloy by-pass studs used for regulator, reclosers , and meter g devices for by-passing operations.Provides superior corrosion protection as well as high conductivity. Chance hot line clamps are to be used in conjunction withs option.
2. Teγminal Pαd
High conductivity tin-plated copper, two-pole te1minal pad.
3. Bαck…-up Spγings
Two stainless steel springs for high strength and superior corrosion resistance to mainin efficient current transformer at the stationary contact and end of blade.
4. LoαdbγeαK Hooks
Hot dipped galvanized steel for co1Tosion protection to be used with portable loadbreak tool.Also acts as a blade guide to increase the side loading capabilities during switch closing.
5. Copper Blade
High conductivity copper blade and silver-plated moving contact areas.The blade utilizes four-finger contact design for superior performance on momently cun·ents.Blade is triangulated and
edge-formed for superior stiffness and blade side-loading capability during closing.
6. Stαinless steel pin
Stainless steel pin can be positioned to stop the blade at 90° or 160°.
7. 160° Open Position Latch ( Optional)
This is a stainless steel latch to hold the blade in the 160° open position.
8. Parallel Groove Connectors ( Optional)
Fortified cadmium-plated aluminum parallel groove clamp ,
fw·nished with galvanized steel bolts and nuts and
9. Insulators
Available in bolt circle distribution insulators of light weight silicon alloy rubber or porcelain.
10. Switch Base
Bases are hot dψgalvanized for corrosion protection and can be mounted with the supplied back-strap on a single or double crossann; they can also be mounted on aluminum or steel equipment mounts.See drawings on following pages for dimensions.
JI.Seγγαted slots
For retaining carriage bolts, which are included, with the mounting back-strap when ordered.Smooth slots are available as an option.
12. Back-strap
Co1nes with hardware to match the distribution base ordered: U-shaped for rigidity and strength.Galvanized for con·osion protection.
13. Dead-end Provision
Holes for dead-ending conductors are stamped out of the galvanized steel base.Rated for 8000 lb.
14. Captive Hαrdwαre
Two stainless steel spline bolts pressed into each terminal pad, bronze nut and stainless steel lock washer included.
Two types for Single-Phase and Three-Phase Units Principal Application: Recloser Maintenance
By design, the Type GW9A Switch provides an economical means for bypassing and disconnecting a pole-mounted distribution recloser. This permits
de-energized periodic maintenance of the rec loser without interrupting service.
The GW9A Switch accomplishes this by a combination of three disconnect switches mounted on a common base.By operating the blades in proper sequence, the recloser is bypassed and isolated from the distribution system.
Feαture
I .Silicon Alloy Rubber
2.Bolt-Circle Insulators
3 .Fully-welded mounting base
6. Time proven insulator material provides maximum leakage distance and minimizes weight, up to 25% lighter than competitive designs
7. Maximum rigidity, eliminates possibility of misalignment compared to bolt-together designs
8. Ma.intains switch alignment for smooth, positive blade operation
9. Facilitates connection to recloser with maximum pole cleru· c e
IO.Time proven design provides reliable service under anticipated service conditions.
The Type GW9B By-Pass Switch is used to bypass and isolate substation reclosers for routine maintenance and repair. The switch usually is applied in combination with a separately mounted compantion disconnect switch.
The GW9B By-Pass Switch consists of a 630 Amp loadbreak disconnect switch in series Wlth a Type C cutout fuse holder, which provides protection to the circuit while the recloser is out of service.Both devices are mounted on a common mounting channel for ease of installation.Both 100 Amp and 200 Amp fuse holders are available to fit specific installation requirements.
The GW9B switch is available in ratings of 15kV/BILl lOkV and 27kV1BIL150kV with either 100 Amp or 200 Amp fusing. The fuse mounting can be either on the right-or left-hand side of the switch.
Operation of the Type GW9 By-Pass Switch is shown in the figure below.In no1ma1 operation the fuse holder is disconnected and the circuit recloser provides circuit protection.To bypass the recloser for repair, maintenance, etc., the cutout fuse holder with appropriate fusing is installed in the bypass disconnect and close and the series disconnect switch blade is opened to isolate the recloser.The M3S companlion disconnect switch is opened last to co1npletely isolate the recloser from the circuit.
To restore service , e recloser should be closed.The GW9 companion disconnect switch is closed followed by the disconnect blade on the GW9B Bypass Switch. The fuse holder is then opened and re1noved.
The Type GW9C By-Pass Switch is used to bypass and isolate substation reclosers for routine maintenance and repair. The switch usually is applied in combination with a separately mounted GW9 companion disconnect switch.
The GW9C By-Pass Switch consists of a 630 Amp loadbreak disconnect switch in series with 2 unit seperate GW9 disconnect switch, which provides protection to the circuit while the recloser is out of service.Both devices are mounted on a common mounting channel for ease of installation.
The GW9C switch is available in ratings of 15kV/BIL110kV and 27kV/BIL150kV
1. Tenninal Pads
Tin-plated high-conductivity copper, two-hole te1minal pad.Parallel Groove connectors and captive hardware are available as options. 2.Loadbreak Hooks
Hot-dipped galvanized steel hooks are provided as standard on the disconnect blade and fuse mounting.
3 .Disconnect Blade
The by-pass disconnect blade is of the same construction as that used on the GW9 Hookstick Disconnect Switch. They are high-conductivity copper blades, silver-plated at all contact rueas.Stainless-steel back-up springs ru·e used to maintain efficient cun·ent cuurrent transfer between the stationary contact and the end of the blade.See Catalog Section 14B for further description.
4. Insulators
Insulators ru·e bolt circle.
5.Mounting Base
Formed galvanized-steel base provides maximum rigidity and is designed for substation structure mounting.
1. GW9 Switch blades and stationary contact
2. Formed galvanized-steel mounting base
3. Utilizes proven cun·ent-carrying components from the GW9 Switch
4. Provides maximum strength and rigidity
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