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Home | Products | Metal Enclosed Electrical Apparatus
Voltage Regulator Enclosures
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Connection | Construction | Paint Colors | Options
Voltage regulators can be thought of as a step autotransformer. Normally, by control sensing, these regulators step the voltage up or down in increments when the system voltage becomes to high/low. By doing so you provide a clean steady source of power to the transformer feeding the loads. This not only protects your load but it also helps to protect the transformer from stray voltages and transient currents. Bypass switches and fused disconnects are also provided. The fused disconnect provides fuse protection and isolation for the transformer and the regulators. Coordinating the fuse with the transformer can be accomplished by Gilbert Electrical Systems given the ratings of the system and ratings of the transformer. Adaptive throat connections can even be provided for direct mounting the transformer to the regulator enclosure.
Regulators can regulate a single or a three phase circuit using any combination of one, two, or three regulators. Two regulators can be connected open-delta to regulate a three phase, three wire wye system. To help explain the different connections, below is a series of diagrams to help illustrate the typical connections of regulators.
Each circuit represented above shows a single pole bypass switch, pole mounted single phase regulators, single pole disconnects Each circuit represented above shows a single pole bypass switch, pole mounted single phase regulators, single pole disconnects for regulator isolation and primary switching and fusing. A variety of combinations are possible and only the typical ones are shown above.
The pro’s of using regulators enclosures are vast. Not only do you protect the regulator from hostile acts of vandalism, terror and war time acts but also from the weather and wildlife which will prolong the life of the regulator. Gilbert Electrical enclosures have been approved for a seismic 4 event due to the rugged environment which it may be situated. By using single phase regulators in lieu of a three phase padmounted type regulator, you eliminate the worry of losing a phase and having to replace the entire regulator. Also, by purchasing the complete lineup you have a turn key unit. If purchasing all item separate, you must find real estate to mount the regulators, bypass switches, single pole disconnects, primary fusing and group operated disconnect. Not only do you have to position each item for ease of access and maintenance you must wire/connect these items together. In a three phase, delta configuration this can be quite troublesome and time consuming. All of this is eliminated with a regulator enclosure. Some of the projects completed by Gilbert electrical include US Embassy Nairobi, US Embassy Dar Es Salaam, US Embassy Zagreb, US Embassy Angola and US Embassy Abuja, in Nigeria. Gilbert has projects here in the US as well which include many hospitals for power regulation.
Figure 7 shows a typical regulator enclosure lineup consisting of a five bay enclosure. A primary disconnect switch is located in the left most bay #1. Next, the bypass and regulator isolation switches are located in bay 2. Bays 3, 4 and 5 house the three regulators in a three phase system. All panels are removable and are secured with tamper resistant hardware. Customer connections for the incoming power feed and outgoing transformer feed are located in bay 1 and the rear of bay 2 respectively.
The enclosure is fabricated of not less than 11 gauge mild steel with the necessary angle and/or channel base frame for regulator support. Units may also be constructed from 304 stainless steel, 316 stainless steel or aluminum. Each section shall be provided with a minimum of 4 lifting lugs for shipping and lifting the unit. All roofs are crowned with rain troughs between sections for proper water drainage. All corners are formed and welded which are then ground smooth. All hardware is plated and each compartment shall have hinged doors which shall be external panel mounted to the door and to the enclosure. The door is removable from the open position. All doors have stop latches and "Eberhard" or equal door locks and handles with 3-point latches. Enclosure is rated NEMA 3R equivalent, which protects the regulators and switches from rain and weather. Unless to difficult to ship, the units shall be factory assembled. When shipped, units are wrapped in cardboard sheeting then plastic wrapped for weather resistance. Units are then placed on a wooden pallet for easy lifting from the bottom. If lifting from the bottom is not desired unit may be lifted by the lifting lugs. Lifting lugs are located at the base where lifting plates may be attached for lifting by crane. Lifting attachments are not provided and must be supplied by others. Each unit is provided with an Operating and Maintenance Manual to allow users to perform scheduled maintenance and to preserve the life of their enclosure. Click Here for complete Enclosure Specifications. NEMA 3R – Enclosures constructed for either indoor or outdoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt, rain, sleet, and snow; and that will be undamaged by the external formation of ice on the enclosure.
Alesta®2 brand Powder Coating system is
used to provide a tough, durable and highly decorative
finish on regulator enclosure assemblies. The final product has a cured film thickness of
approximately 2.5 to 3.0 mils and is volatile organic compound
(VOC) free. For extremely corrosive environments, an additional primer coat is offered as an adder. This is a superior system to other standard paint
systems and has excellent hardness, flexibility, exterior durability,
corrosion resistance, and chemical /solvent resistance. Our factory employs a five stage pretreatment
process that cleans, treats and seals the material to be coated,
ensuring a quality, corrosion resistant finish. This
process first thoroughly cleans the steel and then treats it with an
Iron Phosphate conversion coating that serves as a rust inhibitor
and bonding agent for the Powder Coating. The final step in this
process enhances the corrosion resistance of the painted part as well as
increasing the adhesion properties of the topcoat. All five steps work
together to ensure a superior finish. Click Here to see our complete paint specification. Alesta® brand powders is UL recognized for steel enclosures for outdoor use. There are many ways to customize your order in lieu of different sizes. Items such as protective barriers behind each door, penta head door handles, dead front, live front, etc. Since different needs require different enclosures, table 1 below is a list of options that may guide you in constructing you own custom enclosure.
The first two options in table 1 are door handles. Standard Eberhard door handles are provided unless replaced by these options. The following four options are protective barriers. Utilities, electric companies, and REA sometimes require these protective barriers, which are located directly behind the door. All barriers are Nema and IEEE compliant. The final two options are windows in the doors and no venting. If ordering a window in the doors please specify how many doors must have windows in them by adding a number immediately after the –W. |
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Many
colors are available which include ANSI 61 Gray, ANSI 70 Gray
and