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History

The Electric Century

Even a true visionary like Thomas A. Edison could not have imagined the level of sophistication that would be required of equipment used for the transmission and distribution of electric power a little more than a century after its invention. Nor could he have anticipated all of the complex issues facing the electrical industry as it moves into the twenty-first century.

With the only research and development lab in the industry still named after this prodigious inventor, The Thomas A. Edison Technical Center, Cooper Power Systems is proud to trace its heritage back to this industry pioneer. Thomas A. Edison, Incorporated, one of Thomas Edison’s original companies, combined with McGraw Electric Company in 1957 to form McGraw-Edison. In 1985, McGraw-Edison became part of Cooper Power Systems.

Since its formation in 1985, Cooper Power Systems has continued the commitment of its forebears to innovation. The Thomas A. Edison Technical Center embodies Edison’s philosophy of finding a better way.

Cooper Power Systems’ roots, like any family tree, come from multiple sources: Kyle, Line Material, McGraw-Edison, RTE and Kearney. Each company played a key role in the development of modern distribution systems. Many of the common pieces of equipment and practices in use today were developed by these companies. Here is a brief overview of Cooper Power Systems’ heritage.

Kyle Corporation

Kyle Corporation started as Electrical Connectors and Manufacturing Company in 1933. In the early 1940’s, Kyle marketed a number of innovative circuit reclosers under the Kyle brand. The brand would become the industry leader in reclosers, sectionalizers and switchgear. In 1947 Kyle merged with Line Material Company.

Line Material Company

The Line Material Company, founded in 1911, grew to be a major force in the electrical manufacturing industry as manufacturers of fuses, switches, line hardware, arresters, transformers and more. Line Material became part of McGraw Electric in 1949.

McGraw Electric

McGraw Electric goes back to the turn of the 20th Century. The Company started in 1900 as an electrical contractor, wiring houses and connecting doorbells. It expanded into electrical products manufacturing with several acquisitions over the years. In 1952 it merged with Pennsylvania Transformer Company.

McGraw-Edison

Formed in 1957 with the acquisition of Thomas A. Edison Incorporated by McGraw Electric, its history goes back to Thomas Edison and the first electric power distribution system he developed in the late 19th Century. McGraw-Edison Power Systems joined Cooper in 1985.

RTE

Founded in 1947 under the name of Rural Transformer and Equipment Company, RTE developed many advances that significantly changed industry practices in underground distribution. It became part of Cooper in 1988.

When RTE received a patent on the 15 kV loadbreak elbow design in 1966, its potential growth was probably unrealized at the time. It is estimated that there are well over 10,000,000 such elbows in service today. As a leading innovator in the industry, RTE continued to introduce new products for underground distribution systems.

RTE was the first to develop non-gassing current-limiting fusing. In 1994, Cooper Power Systems acquired Combined Technologies Inc. to expand their product offerings in current-limiting fuses.

Kearney

Kearney engineers developed connectors, hardware and tools that made overhead line construction and maintenance easier, safer and more dependable. Family held and formed by James R. Kearney in 1926, it became a part of Cooper Power Systems in 1997.

Electromanufacturas, S.A. de C.V.

Founded in 1963 in Guadalajara, Mexico, Electromanufacturas, S.A. de C.V. (EMSA) manufactures pole-mounted, pad-mounted and substation transformers and was ISO 9001 certified by UL in 1997. EMSA became a part of Cooper Power Systems in 1999.

Through all of its acquisitions, Cooper Power Systems has grown to become the leading manufacturer of one of the most complete lines of electrical distribution equipment in the world. The Company has stayed on the leading edge of product innovations: high performance transformers filled with the most advanced fluid in the industry; distribution switchgear that energizes capacitors while preventing severe transient voltages; unique high-voltage cable disconnect systems; components offering the best lightning surge protection.

Cooper Power Systems is committed to continued product development and innovation that will solve customer problems, reduce total owning costs, and promote better power quality, reliability, safety, performance and environmental stewardship. Following Edison’s mandate - there’s a way to do it better - Cooper is committed to finding it. This is part of our company’s history, and will guide our future growth.

 

 

Kyle Highlights
1941 1Ø Hydraulic Recloser w/Dual Timing
1946 3Ø Hydraulic Recloser
Line Material Highlights
1920 Porcelain-Housed Fuse Cutouts
1920Drop-Out Fuse Cutout
1920Expulsion Gap Arrester
1932Valve-Type Arrester
1933Circuit Reclosing Disconnecting Fuse Cutout
1934Glass-Housed Arrester
1938Ground Lead Disconnect Arrester
1949Capacitor Units w/Stainless Steel Tanks

McGraw Highlights
1949Sectionalizer
19563Ø Recloser w/Ground Trip

McGraw-Edison Highlights
1958Distribution Arresters Through 72 kV
1959 Step Voltage Regulator with Direct Drive Tap Changer
1961 Solid State Electronic Recloser Control
1963 Full Range Current Limiting Fuse (NX ® )
1963Motor Operated Recloser
19681Ø Vacuum Recloser
1971All Film Dielectric Capacitor
1975Environmentally Responsible Capacitor Dielectric Fluide (Edisol ®)
1978Smart Switch for Distribution Automation
1979Shielded UD Arrester
1980MOV Overhead Arrester
1984Microprocessor Control for Voltage Regulators
1984Microprocessor-Based Recloser Control

RTE Highlights
1957Externally Operated Tap Changer Switches
1958 Pad-mounted Transformers
1958 Externally Operated Dual Voltage Switches and Dual Voltage Transformers
1960Bay-O-Net Fuse Assembly and Isolation Fuse Links
1964Loadbreak Elbow Terminators System
1972Transformer Primary Switch
1973Full Range Current Limiting Fuse (ELX)
1973Current Limiting Bushing
1974Under-Oil Full Range (ELS) and Back-Up (ELSP) Current-Limiting Fuses
1974Four Position Loadbreak Switch
1975R-Temp ® Fluid
1978Fully Rated 35 kV Large Interface Loadbreak Elbow Connection System
1983Riser Pole Current Limiting Fuse
1984MagneX ® Interrupter (Primary Breaker for Transformers)
1979Solid State Varistor Technology (M.O.V.E. and Parking Stand Arresters)
1988VFI Pad-mounted Switchgear

Kearney Highlights
1926Split-Bolt Connector
1934 Snub-R-Grips, Service Drop Wire Grips
1937 Trip-O-Link ®, Two-Shot Reclosing Switch
1938Trip Saver Repeating Surge Protector
1939Fit-All ® Interchangeable Fuse Links
1947Type X ® Fuse Links
1952Copper H-Frame Connectors
1954Aluminum H-Frame Connectors
1954WH-1 Self-Contained Hydraulic Compression Tool
1965Primary Enclosure
1966Airseal ® & Aqua Seal ®
1966Ultra-Range Squeezons ®
1969VACpac ® Vacuum Switchgear
1970Uni-Kearn ® Arc-Extinction Material for Loadbreak Inserts
1973Cam-El ® Clamp Stick
1978Direct Bury Primary Switching Pedestals
1995Lineminder ® Automated Switches

Cooper Power Systems Innovations
1985V-PRO ® Overcurrent Protection Software
1985 V-HARM ™ Harmonics Software
1986 Extended Foil/Solderless Capacitor
1987 Rotatable Feedthru Bushing Insert
1987Mini-ELSP Fuse
1987600 A Deadbreak “Threadless” Stick Operable System (PUSH-OP ® )
1988Capacitor w/Unified, Definite Tank Rupture Curve
1988600 A Deadbreak Shotgun Stick Operable Systems (Bol-T™ and T-OP™)
1988Resettable Vacuum Fault Interrupter
1988Tri Clamp Low Voltage Bushing
1988T-OP™ II 600A Disconnect System
1989DISTRELY™ Reliability Software
1989Envirotemp ® 200 Synthetic Ester
1989V-MONITOR™ Harmonics Monitor
1989VariGAP ® Overhead Arrester
1992VariGAP ® (MOV gapped) Elbow and Parking Stand Arresters
1992Thermoplastic Bushing Well
1992Electronically-Controlled Vacuum 1Ø Recloser
1993Solid Insulation Capacitor Switch
1994V-Flicker™ Voltage Flicker Meter
1994Removable Stud Bushing Well
1994Edison ® - Pro Relay
19951Ø and 3Ø VFI Transformers
1995Integrated Communications Platform/Recloser Control
1996ELF Dropout Current-Limiting Fuse
1996Pad-Mounted Voltage Regulator
1996Hi-Current Bay-O-Net Fuse
1997Tandem ELF™ Fuse
1997U-OP™ 600A Disconnect System
1998FM Approved and UL Classified Liquid-Filled Transformers
1998POSI-BREAK™ Elbow
1998NOVA™ Solid Insulation Recloser
1998STAR™ Faulted Circuit Indicator
1999PATHFINDER™ Faulted Circuit Indicator
1999High Firepoint Dielectric Fluid Made from Seeds (Envirotemp ® FR3™)