Pad-mounted source transfer (PST) system

Switchgear

Eaton's Cooper Power series PST pad-mounted source transfer (PST) switchgear with iST control is a compact, outdoor, self-contained system ideal for critical, medium-voltage loads. These applications include healthcare facilities, data centres, broadcast studios and production facilities that require highly dependable power for continuous, optimum operation.

Contact me about this solution

Back to search

Overview Technical Resources

Fully integrated controls package

Resettable overcurrent protection

Compact, low-profile design

Unobtrusive

Vacuum interruption

Years of trouble-free performance

Core features

Provides fast transfer in six cycles or less, programmable, no-blink parallel restoration through sync check or non-parallel restoration and vacuum interruption
Low-profile, self-contained and self-powered deadfront design
Offers three-phase switching and fault, as well as overcurrent protection
Includes SCADA operable, metering and automatic or manual operation
Provides communication protocols, ethernet and fiber
Offers a fault block, fully-integrated controls and event recording for post-event diagnostics
Available in industry-standard model 6 (one load) configuration or model 9 (two loads) configuration.

Automatic load transfer and overcurrent protection in a single pad-mounted switchgear unit

Eaton’s Cooper Power series PST pad-mounted source transfer package provides protection against loss of source health as well as overcurrent and fault protection for critical loads. It features deadfront source and tap cable compartments and a sealed tank.

Advanced metering, control and communications tools

Eaton’s Cooper Power series iST control detects loss of source health and automatically transfers the load between the preferred and alternate sources, as well as providing fault detection.

Specifications

Electrical ratings

	15 kV	25 kV	35 kV
Maximum design voltage, kV	95	125	38
BIL, kV	95	125	150
1-minute withstand voltage (60 Hz) interrupter and terminators, kV	35	40	50
Continuous current (max), A	600	600	600
Interrupting current (sym./asym.), kA	12/20	12/20	12/20
Momentary current 10 cycles (asym.), kA	20	20	25
1-second withstand current (sym.), kA	12	12	12
Making current (sym.), kA	12	12	12
Transformer magnetizing interrupting current, A	21	21	21
Cable charging interrupting current, A	15	15	20
Capacitive, A	10	25	40

Switching and transfer times

Direction of transfer transition	Type of return (cycles)	First interrupter reaction time* (cycles)	Transition time* (cycles)
Preferred to alternate	Non-parallel	2.0 to 3.0	5.0 to 6.0
Alternate to preferred	Non-parallel	2.0 to 3.0	5.0 to 6.0
Alternate to preferred	Parallel**	5.0 to 6.0	2.0 to 3.0
* Time from expiration of time delay to first opening (or closing) of high-voltage interrupter. Add about 1 cycle to values shown to allow for iST control contact time.
** Parallel return time does not include sync check time.

Standard features

Hinged cover and doors to provide easy access to connections and controls
Push-pull handles for manual charging of the stored energy switch operators
Contact position indicator
Operation counter, one for each switch
Manual trip/close levers lockable in the open position
Disconnect switches for internal sensing PTs
Spring charged status indicators
Liquid sight gauge provides visual indication of liquid level within tank
Mineral oil fluid dielectric medium

Optional features

Mild or stainless steel construction
Motor operation
Additional two-stage auxiliary switches
Operation counters on tap ways (model 9 only)
Semaphores on tap ways (model 9 only)
Visible break on tap ways (model 9 only)
Fault indicator provisions
Drain valve w/sampler
E200 or Envirotemp FR3 fluid dielectric medium

Download Links

Visit this page for information on earlier models.

Additional literature

Eaton is an intelligent power management company dedicated to improving the quality of life and protecting the environment for people everywhere. We are guided by our commitment to do business right, to operate sustainably and to help our customers manage power ─ today and well into the future. By capitalizing on the global growth trends of electrification and digitalization, we’re accelerating the planet’s transition to renewable energy and helping to solve the world’s most urgent power management challenges.