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UEE manufactures safe, reliable, and cost-effective CSA-certified switchgear using a modular approach that leverages extensive design experience with a vast library of metal-enclosed, metal- clad and arc-flash resistant switchgear cell configurations.
Using advanced 3-D modeling techniques, our UEE design team can readily configure complex and completely unique switchgear lineups from pre-existing models without the time and cost typically associated with ground-up custom design and fabrication.
Modular Metal-Enclosed Switchgear – Load Break
UEE Modular Metal-Enclosed (MME) Load Break Switchgear is a simple, reliable, low-maintenance and cost-effective solution suitable for a wide variety of high-voltage switching applications. Compact and light, UEE Modular Metal-Enclosed Switchgear fits most indoor or outdoor locations.
The primary load interrupting mechanism is a three-phase air-insulated load break switch mounted in the top compartment of the switchgear module. The load break switch interrupts current with blades that travel in energy-controlling arc chutes. The load break switch utilizes a stored energy spring that charges every time the switch is closed and quickly disengages the conducting blades for safe, reliable tripping. The load break switch is also equipped with shunt-trip and blown fuse trip mechanisms, as well as trapped key interlocks, for further ensuring safe operation.
Over-current protection is handled by high-voltage fuses mounted in the lower compartment. The fuses are system specific and are isolated from the line-side compartment by a rigid insulating barrier. Independent doors for fuse and switch access, along with the trapped key interlock scheme, ensure that line-side components of the switchgear are not accessible when fuses are being changed. Spare fuses are stored on the fuse access door. A wire-reinforced glass window in the load break access door allows a visual check of the switch blades to verify the switch state. The key interlocking scheme ensures that the bolt-secured upper load break access door cannot be opened unless the fuse compartment door is also open.
Modular Metal-Enclosed Switchgear – Circuit Breaker
UEE Modular Metal-Enclosed (MME) Circuit Breaker Switchgear is a simple, reliable, low-maintenance and cost-effective solution suitable for high-voltage switching applications that require the flexibility of protection relay and circuit breaker schemes. Compact and light, UEE Modular Metal-Enclosed Switchgear fits most indoor or outdoor locations.
UEE MME Circuit Breaker Switchgear utilizes industry recognized and specialized high-voltage vacuum or SF6 circuit breakers. The breakers can be fixed or withdrawable and are complete with regulatory safety devices, such as trapped key interlocks, for further ensuring safe operation. The breakers can als be configured with extra devices such as auxiliary contacts, operation counters, undervoltage relays, etc. Digital protection relays are provided with protective functions that meet system specific requirements.
Each MME Circuit Breaker Switchgear module has separate access doors to both the upper switch compartment and the lower breaker compartment. Both access doors are protected by key interlocks. A wire-reinforced glass window in the switch access door allows a visual check of the switch blades to verify the switch state. Protection and control devices are located in a segregated compartment.
Modular Metal-Clad Switchgear
UEE Modular Metal-Clad (MMC) Switchgear is a reliable, technically-advanced, high-voltage switching solution that can be used whenever flexibility, increased safety and the highest degree of reliability are paramount.
Available in one-high or two-high construction, UEE MMC Switchgear utilizes an industry recognized and specialized high-voltage vacuum or SF6 circuit breaker. Following nationally recognized design specifications, the circuit breaker is removable (drawout) with self-aligning primary contacts that automatically make and break the power connections as the breaker is withdrawn. Secondary contacts are either a self-aligning or manual plug type connection. When the breaker is withdrawn in the disconnected, test or removed position, automatic shutters isolate the primary contacts. The breaker is provided with safety key interlocks so that breaker operation, whether electrical or mechanical, is possible with the compartment door closed.
Modular Metal-Clad Arc-Resistant Switchgear
UEE’s Arc-Resistant (AR) Switchgear provides an outstanding level of safety for industries increasingly required to manage or eliminate arc-fault hazards. UEE AR Switchgear builds on our existing modular metal-clad design and adds specific features to control the energy associated with internal arcing faults.
UEE AR Switchgear is designed, tested and qualified to type 2B ‘accessibility type’, as per IEEE C37.20.7. Accessibility type 2B provides a level of safety from the front, rear, and sides of the switchgear in the event of an internal arc fault. 2B also includes a level of safe operation with the opening of the low voltage control or instrumentation compartment door.
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