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Switchgear

Pad-mounted source transfer (PST) system

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.

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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
  • Eaton padmount switchgear relay package product aid
    Eaton’s Cooper Power series padmount Vacuum Fault Interrupting (VFI) and Padmount Source Transfer (PST) switchgear is now available with an expanded controls package featuring Schweitzer Engineering Laboratories (SEL) distribution protection relays.
    (PDF 421 KB , 07/05/2021)
    Download
  • PST pad-mounted source-transfer system product aid
    This brochure discusses Eaton’s Cooper Power series PST switchgear with iST control which is a compact, outdoor, self-contained system ideal for critical medium-voltage loads, including healthcare facilities, data centers, broadcast studios and production facilities that require highly dependable power for continuous, optimum operation.
    (PDF 467 KB , 01/09/2017)
    Download
  • iST source transfer relay catalog
    This catalog describes ratings and ordering information for Eaton’s Cooper Power series Edison Idea iST relay family which consists of the iST-621 for single feeder applications, and iST-921 and iST-901 for two-feeder applications.
    (PDF 824 KB , 28/08/2019)
    Download
  • PST pad-mounted switchgear
    This catalog describes ratings and ordering information for Eaton’s Cooper Power series pad-mounted Source Transfer (PST) package which provides protection against loss of source health as well as overcurrent and fault protection for critical loads.
    (PDF 1 MB , 07/05/2021)
    Download
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