PRAM | G&W Electric

PRAM style incorporates in-line bushing arrangements with a 5" phase spacing. Bushings can be top, bottom, front, or side mounted. PRAM style switches are available in rotary puffer (RP) and linear puffer (PI) designs.

Linear Puffer (PI) 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 DC kV
Continuous and load break current	630 Amps	630 Amps	630 Amps
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
Mechanical endurance, operations	2000	2000	2000

SF6 density switch SF6 density switch Add to Request Portable switch controls Portable switch controls Add to Request Stationary switch controls Stationary switch controls Add to Request 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 600A Universal bushings (through 25kV) 600A Universal bushings (through 25kV) Add to Request 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. Remote terminal units and communication packages for SCADA integration Remote terminal units and communication packages for SCADA integration Add to Request Ground lug Ground lug Add to Request Voltage sensor with 120VAC output or a contact to indicate presence of voltage Voltage sensor with 120VAC output or a contact to indicate presence of voltage Add to Request Key interlock to lock in open position Key interlock to lock in open position Add to Request Automatic Transfer Control Type ATC451 Automatic Transfer Control Type ATC451 Add to Request Temperature compensating pressure gauge Temperature compensating pressure gauge Add to Request Voltage indication panels Voltage indication panels Add to Request 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. Low pressure warning device Low pressure warning device Add to Request Motor actuators for remote switch operation Motor actuators for remote switch operation Add to Request 600A voltage sensing bushings 600A voltage sensing bushings Add to Request 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. Auxiliary switches for remote switch position indication Auxiliary switches for remote switch position indication Add to Request Operation counters Operation counters Add to Request Stainless steel switch tank Stainless steel switch tank Add to Request Stainless steel padmount enclosure Stainless steel padmount enclosure Add to Request Current transformer for load break ways Current transformer for load break ways Add to Request 200A deepwell bushings 200A deepwell bushings Add to Request 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. Key interlock provisions Key interlock provisions Add to Request SF6 gas refill kit SF6 gas refill kit Add to Request 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. Potential transformers Potential transformers Add to Request 600A welded flange bushings 600A welded flange 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. 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. 600A Open stud bushings 600A Open stud bushings Add to Request 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.