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The purpose of automatic source transfer
controls (ATCs) is to minimize or eliminate outages by providing
a means of automatically transferring from one source to another.
G&W offers a variety of automatic transfer control (ATC)
packages that provide customized
features for feeding critical load customers or systems. Typical
installations include hospitals, airports, processing plants,
hotels, and government sites.
ATC requirements vary from installation to installation. Some
emphasize transfer time, others require a standby generator
as an alternate source of power, while still others need SCADA
integration, submersibility, or a small footprint because
of confined space limitations. G&W provides flexible,
custom power solutions, from switchgear to ATC controls.
ATC 451 Control
G&W ATC 451 automatic transfer controls are available for G&W SF6 gas or solid dielectric insulated switchgear through 38kV. Switches can be dry or submersible vault, padmount or pole mount styles. The two incoming source ways can be located in one switch, or in two separate switches for added redundancy.
Features
• Uses SEL 451-4 relay for its protection logic and programming scheme.
• Plug and play construction - The ATC 451 is pre-programmed and packaged with all required components to simplify installation and maximize reliable performance.
Various styles of NEMA enclosures are available depending on the application.
• Overcurrent protection for two fault interrupting ways - The ATC 451 can eliminate the need for separate vacuum interrupter controls.
Depending on user preference and system protection schemes, various styles of separate interrupter controls are available.
• SCADA ready - Each ATC 451 comes standard with several serial ports for communication to SCADA systems. Multiple protocols are available including DNP3.0 (standard), Mirrored Bits (standard), and IEC 61850 (option). Ethernet or fiber optic ports for communications are also available options.
• Lazer ready - The SCADA ready capability of the ATC 451 simplifies the requirements for communication to other intelligent field devices for automatic power restoration schemes. This simplifies the integration of the ATC into any G&W pre-engineered Lazer automation system where automatic transfer is required.
• Generator source capability - The 451 can be programmed to permit a standby generator to be used instead of a second utility source.
• Bus-tie configurations - The ATC 451 can be used with a bus-tie switch permitting automatic transfer on systems where the load is normally balanced between two sources.
• User friendly controls - Large pushbuttons are clearly labeled and provide easy control commands from the front panel.
• Sequence of event recorder - Each ATC 451 includes a Sequence of Events Recorder (SER) which will record the last 1000 entries, including setting changes, powerups, and selectable logic elements.
• Flexible voltage sensing options - Integral voltage sensing bushings are available which eliminate the need for cumbersome add-on devices. The bushings are 600A rated, fully submersible, and provide one analog output per phase and one digital output per way for voltage monitoring. Elbow mounted sensors and potential transformers are also available.
ATC 101 Control
Features
• User-friendly system interface, minimal training required
• All ATC logic parameters user-configurable
• Generator source settings
• Integral SCADA contacts for ease of automation
• Individual timing delays for source 1 and 2
• Test mode operations
• Selectable paralleling of sources operation
• NEMA 4 Enclosure
• Integral battery test under load conditions
• Battery back-up to AC input power
• Emergency return functionality
Options
• Sequence
of events recorder
• NEMA 4X enclosure
• NEMA 6P enclosure
• Integrated with user-selected RTU or protocol preference
for full SCADA operations
• Faulted Circuit Indicators
For switchgear configurations with unprotected load taps,
three clamp-on style detectors can be provided for downstream
fault indication. The cables from these devices can be wired
into the ATC controls to prevent operating the switchgear
into a downstream fault. Faulted circuit indicators may not
be required for G&W vacuum fault interrupter load tap
ways.
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