AUTOMATIC TRANSFER SWITCHES

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Transfer Switch General Review
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Introduction
This presentation will provide you with an
overview of Transfer Switches with an emphasis on
the Russelectric type.
At the end of this presentation, you will be able
to determine the use, application, operation,
advantages and differences of Russelectric
Transfer Switches.
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Definition

• Per NEC - An automatic or non-automatic device
  for transferring one or more load conductor
  connections from one power source to another

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Standards

• The Primary Standard is UL 1008
• Other Applicable Standards are ANSI, IEEE and
  NEMA

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Models Available

• RMT - Single electric operator

• RMTD - dual electric operated

• RMTMAN or RMTDMAN -Electrically Operated or
  Manually Operated

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RMT or RMTD Features

• High speed quick-break, quick-make, preloaded
  transfer reducing contact erosion and increasing
  longevity
• Positive Mechanical and Electrical Interlocking

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RMT or RMTD Features continued

• Rapid and reliable arc quenching
• Safe Manual Operator or
• External Manual Operator for added protection

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RMT or RMTD Featurescontinued

• The RMT/D operating mechanism is unique in that
  it provides the ability to manually transfer the
  switch at full speed if the controls fail to do
  so.
• This means the contact speed is independent of
  the speed of the manual operating handle reducing
  arc flashing

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RMT or RMTD Features continued

• Front Connected Control Components and Wiring
• 600 Volt SIS wire, 18 AWG minimum
• Front Access 100 through 3000 amp for greater
  installation flexibility

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Withstand RatingsThe Highest in the Industry

• 3 Cycle Close and Withstand _at_ 480Vac
• 100 - 400 Amps 42,000 Amps
• 600 - 800 Amps 65,000 Amps
• 1000 - 1200 Amps 85,000 Amps
• 1600 - 4000 Amps 100,000 Amps

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Switch Size Rating

• The switch is to be sized by two factors
• The Continuous Current Rating
• and
• The Available Fault Current (normally from the
  Utility side)

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Applications

• RMT - Single Operator Life Safety, Critical,
  and single ATS for entire Bldg
• RMTD - Dual Operator Equipment Loads,
  Transformers, Elevators and where Block Transfer
  and Load Shed is used

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The Russelectric Approach toswitching inductive
loads...
RMTDDual Motor Operator Transfer Switch
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The RMTD

• Center-Off time delay for reducing/eliminating
  regenerative voltage when transferring large
  motors and/or transformers

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The RMTD Advantage

• The primary advantage is with the center off time
  delay the voltage will decay on inductive type
  loads such that switching between two live
  sources is possible without tripping feeder
  breakers

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Switching Inductive (Motor) Type Loads

• RMTD type transfer switch with Accessory 2D, the
  center-off time delay (TNTD, TETD)
• Accessory 23A, B or C - a means of controlling
  the motor load prior to and/or after the transfer
  of the switch
• Accessory 27A or 27B - Synchronizing check relay

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The load source is disconnected for an adjustable
period to allow regenerative power to decay
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The Fourth Pole

• Used when the transfer switch is applied in a
  4-wire system with ground fault protection
• On all Russelectric switches when a switched
  neutral is required the 4th pole is identical to
  the other three poles

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Switched Neutral
The Russelectric Approach
Before

• One-Line of Neutral Bus (4th pole)

Fully Rated Fourth Pole, Switched neutral (Same
construction and withstand rating as the main
power poles)
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Overlapping Neutral
(Other Approach)
Breaks
Before
Makes
One-Line of Neutral Bus (4th pole)
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Model 2000 Features

• Two Asynchronous serial ports with an industry
  standard open architecture communications
  protocol, RS422/485 for high-speed serial
  communications.
• A real time clock with NiCad battery back up

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Model 2000 Featurescontinued

• Self diagnostics which perform periodic checks of
  memory, I/O and communication circuits, with a
  watchdog/power fail circuit
• Password protections allows for qualified and
  authorized users only.

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Model 2000 Features continued

• Three phase under/over voltage and frequency,
  phase sequence and voltage differential
  monitoring on both sources
• Logs the most recent ten transfer events
• Troubleshooting LEDs

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Model 2000 Featurescontinued

• Can be configured for nearly any application to
  meet the customer and/or specification
  requirements

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Overview of the Model 2000 Plus

• Basic Model 2000 Plus
• Level One (Communications)
• Level Three (Communications)

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Basic Model 2000 Plus

• Everything you get with Model 2000

Plus

• Power Monitoring

• Historical Data

• Serial Communications

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Basic Model 2000 Plus

• AC Power Monitor
• Transducer Section
• Protective Relay Section

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Basic Model 2000 Plus

• AC Power Monitor

Transducer Section

• True RMS voltage measurement of each phase of
  both the normal and emergency sources

• Frequency of both sources

• True RMS current of each phase

• Power factor relative to either voltage source

• Phase sequence of each source

• True and reactive power consumption

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Basic Model 2000 Plus

• AC Power Monitor

Protective Relay Section

• Undervoltage and underfrequency sensing of each
  source

• Overvoltage and overfrequency sensing of each
  source

• Phase reversal protection of each source

• Voltage differential protection of each source

• Synchronizing check between the normal and
  emergency sources

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Basic Model 2000 Plus

• Power Monitoring
• Historical Data
• Logs the last 100 events
• No more codes

• Serial Communications

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Basic Model 2000 Plus

• Power Monitoring
• Historical Data
• Serial Communications
• Plugs directly into Microprocessor

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Level One (Communications)

• Basic Model 2000 Plus
• Serial to Ethernet Converter
• Allows monitoring of up to 12 switches using
  multidrop
• Switch can be tied into network
• Allows use of SCADA at faster speed

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Level Three (Communications)

• Basic Model 2000 Plus
• Serial to Ethernet Converter
• Tiny Web Server
• Accessible over the internet from any location
• Special software is NOT required
• Trending and logging is stored right at the switch

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Access

• 100 through 3000 Amp
• Enclosed Type - Standard is Front
• Open Type - Front or Rear Connected

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Access - 4000 Amp

• Available in Rear Access Only

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Power Connections

• EDS 185 - RMT/RTB Lug Data Sheet
• Compression Lugs and Provisions For
• Bus Duct Connections

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Enclosure Features

• 12-gauge steel Minimum
• Types - Nema 1, 3R, 4, 4X and 12
• Plenty of cable bending space
• Painted for indoor or outdoor use
• 3-Point Door Latch with Locking Handle

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Other Features

• Bus connections - Belleville type compression
  washers
• No Aluminum Bus or Connections
• 90 degree Celsius rated Lugs

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Specifications

• RMT, Single Electric operator
• RTBD, Dual Electric Operator
• RMTMAN, Single operator, Non-Automatic
• RMTDMAN, Dual Operator, Non-Automatic

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Pricing

• Sales Form 004 - RMT/RMTD (M2000)
• Sales Form 007 - M2000 Accessories
• Sales Form 038 - RMT (Non-Micro)
• Sales Form 039 - RMTD (Non-Micro)
• Sales Form 036 - RMTMAN
• Sales Form 037 - RMTDMAN
• Sales Form 034 - Accessories (Non-Micro)
• Sales Form 006 - Enclosure Adders
• Sales Form 003 - Compression Lugs

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Conclusion

• QUESTIONS

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