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Home » Products & Solutions » Underground Distribution Switches » Subsurface / Vault Style » SF6 Insulated

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RAM


RAM styles incorporate in-line bushing arrangements with a 5" phase spacing. Bushings can be top, bottom, front or side mounted.

Features:
  • Available in 20kA (Rotary Puffer) and 40kA (Linear Puffer) de signs.

Load break switch (RP) ratings

Maximum design voltage

15.5 kV

27 kV

Voltage class

15 kV

25 kV

Impulse level (BIL)

110 kV

125 kV

One minute withstand

35 AC kV

60 AC kV

One minute withstand, production test rating

34 AC kV

40 AC kV

15 minute withstand

53 DC kV

78 DC kV

Continuous and load break current

630 Amps

630 Amps

Momentary current

25.6 kA asym

20 kA asym

Fault close current, (3 times)

25.6 kA asym

20 kA asym

One second current

16 kA asym

12.5 kA asym

Operations load interrupting endurance (15kV) at 600A

500

350

Mechanical endurance, operations

2000

2000

 

Load break switch (LP) ratings

Maximum design voltage

15.5 kV

27 kV

38 kV

Voltage class

15 kV

25 kV

35 kV

Impulse level (BIL)

110 kV

125 kV

150 kV

One minute withstand

35 AC kV

60 AC kV

70 AC kV

One minute withstand, production test rating

34 AC kV

40 AC kV

50 AC kV

15 minute withstand

53 DC kV

78 DC kV

103 AC kV

Continuous and load break current

630 Amps

630 Amps

630 AC kV

Momentary current

40 kA asym

40 kA asym

40 kA asym

Fault close current, (3 times)

40 kA asym

40 kA asym

40 kA asym

One second current

25 kA sym

25 kA sym

25 kA sym

Open gap withstand

200 kV

200 kV

200 kV

10 operation overload interrupting capability

3000 Amps

3000 Amps

3000 Amps

Operations load interrupting at 600A

1200

1200

1200 Amps

Mechanical endurance, operations

2000

2000

2000 Amps

 

SRAM-F with Front Access Spread Bushings

VRAM-M with Top Access Bushings

VRAM-E with Left Side Access

SVRAM-E with Left Side Access Spread Bushings

600A welded flange bushings

600A welded flange bushings

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Bushings are designed to IEEE 386 standards with standard interface accepting conventional elbow style connectors. Bushings include a stainless steel flange and an aluminum conductor with 5/8"-11 aluminum threaded stud. Elbows must be ordered separately. 200A deepwell welded flange bushings are also available.



Stationary switch controls

Stationary switch controls

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Single-way controls can be supplied in various styles of NEMA enclosures for stationary mounting to the switch or on a nearby structure. Controls are available with or without battery backup and can be powered directly by a 120 VAC supply or from 24 VDC batteries. For SF6 style switches, the control prohibits local and remote operation if the switch dielectric is low. SCADA interface is available permitting remote control and status feedback through an optional, user specified RTU and communication device. Local mode selection takes priority over remote SCADA controls, thus providing the on-site operator with complete and safe control over the switch. Model Numbers For load break switches: Two position . . . . . . . . . . . . . . .SMC120-S With battery backup: . . . . . . .SMC120-S/B Three position . . . . . . . . . . . . .SMC130-S With battery backup: . . . . . . .SMC130-S/B For vacuum interrupters: . . . . . .SMC120-F With battery backup: . . . . . . .SMC120-F/B


200A deepwell bushings

200A deepwell bushings

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Bushings are designed to IEEE 386 standards with standard interface accepting Dead break or load break inserts and conventional elbow connectors (inserts and elbows must be ordered separately). A copper conductor is standard. For bottom entry switches, recommended switch frame height is 42" for all voltages. Welded flange bushings are available.





Ground lug

Ground lug

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600A 3/C Stud bushing compartment

600A 3/C Stud bushing compartment

      Add to Request
Stud bushing compartments include stud bushings with copper conductor, cast iron or non-magnetic cast aluminum mounting plate, shape C body and compartment, solder connector for copper conductors (aluminum conductors require compression style connectors), and WS, RS or DP entrances. Entrance style is dependent upon cable construction. Specify complete cable data when ordering. Accessory entrance fittings may also be required. Stud bushing compartments are designed for a maximum conductor size of 750KCM aluminum or 1000KCM copper. For bottom entry switches, recommended switch frame height is 60" for all voltages. Stress cone kits and compound are required. Consult factory for proper compound selection.



SF6 gas refill kit

SF6 gas refill kit

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Provide remote indication of contact position. One N.O. and one N.C. contact is supplied and can be wired by G&W or the customer. A maximum of two auxiliary switches can be installed per operating mechanism.


600A Universal bushings (through 25kV)

600A Universal bushings (through 25kV)

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The combination Universal Cable End and Universal bushing provides an extremely versatile interface between cable and equipment for easy connecting, disconnecting, and isolating of distribution cable circuits. End caps for both bushing and splice module permit dead-ending of the cable and equipment for fast cable sectionalizing if required. Universal bushings are designed to accept G&W universal bushing cable ends (G&W Universal bushing cable ends must be ordered separately. See chart be low). An aluminum conductor and aluminum single hole pad is standard. For bottom entry switches, recommended switch frame height is 36" for all voltages. Hi-pot test kits are available. NOTE: Universal bushings can accept up to two G&W Universal bushing cable ends per phase. For applications requiring this feature, consult factory.



600A apparatus bushings

600A apparatus bushings

      Add to Request
Bushings are designed to IEEE 386 standards with standard interface accepting conventional elbow style connectors. Bushings include a stainless steel flange and an aluminum conductor with 5/8"-11 aluminum threaded stud. Elbows must be ordered separately. 200A deepwell welded flange bushings are also available.




SF6 density switch

SF6 density switch

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600A voltage sensing bushings

600A voltage sensing bushings

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G&W’s Voltage Sensing Bushing (VSB) system is a temperature compensated, built-in, voltage measuring system that eliminates the need for PTs when three phase analog voltage monitoring is required. Compared to potential transformers, the VS bushing system offers these benefits: • Significant cost savings • Cleaner, less cumbersome installation • Less space required • Fewer add-on components which could potentially fail • Installed and tested prior to shipment • Can be field calibrated • One digital output per way for threshold voltage detection The VS bushing system utilizes a capacitively coupled screen which is embedded within the epoxy bushing. The low energy output of the screen is amplified by integral circuitry, resulting in a 0-120 VAC analog output suitable for direct connection to any relay, IED or RTU. The circuitry incorporates built-in calibration and temperature compensation which improve accuracy. Bushings are designed to IEEE 386 standards with standard interface accepting convention al elbow style connectors and include an aluminum conductor with 5/8"-11 aluminum threaded stud and aluminum single hole pad (elbows must be ordered separately). Bushings are bolt-on style. Copper studs are available. For bottom entry switches, recommended switch frame height is 42" for all voltages.


Operation counters

Operation counters

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600A Quik-change apparatus bushings

600A Quik-change apparatus bushings

      Add to Request
Cable entrance bushings can be damaged at any time due to improper handling, accidental shifting during shipment, elbow failure or even normal wear and tear. In the case of SF6 gas insulated switches where the tank is totally welded, conventional bushing replacement means sending the switch back to the factory for repair. G&W’s exclusive Quik-Change Disconnectable Bushing permits quick, easy field replacement without having to open the switch tank. Bushings are designed to IEEE 386 standards with standard interface accepting Conventional elbow style connectors and include an aluminum conductor with 5/8"-11 aluminum threaded stud and aluminum single hole pad (elbows must be ordered separately). Copper studs are available. For bottom entry switches, recommended switch frame height is 42" for all voltages.




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