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Transformer inspection windows: viewing & IR windows provide a convenient, safe way to monitor the gauges and bushings of a transformer without having to open the cabinet.
Monitor your transformer to ensure safe and efficient operation. It can be a complicated task. Technicians often perform routine inspections while the transformer is loaded. Arc flash hazards expose workers to significant risks, requiring them to wear special PPE for protection. The inspection windows allow you to check the transformer without opening it. It makes it easier for workers to comply with the electrical safety regulations. Conducting routine inspections may also remove the need for certain PPE.
What Is an Inspection Window?
Inspecting windows ensures electrical maintenance safety. These windows are a safe and convenient way to inspect the interior of the transformer cabinet. The gauges, and bushings.
Types of Inspection Windows
There are several different types of inspection windows. We’ll discuss the various versions in this article and how to install them.
Infrared (IR) Windows
The infrared inspection window (IR) allows light to pass from the cabinet’s interior to its exterior. It is important to measure the temperature of the bushings on the transformer as well as other components within the cabinet. These windows are usually made from crystal and not glass. The placement of the IR windows is very important. The IR window should be placed where a heat gun can easily point to the bushings. You can get an accurate reading by using the gun. You don’t have to even open the cabinet.
Thermal imaging cameras can also be used with IR windows. Thermal imaging devices can give you a general picture of the heating in and around the tank. The device also provides some information on the unit’s operating temperature. This information can be used to identify hotspots that are not normal. The bushings may be hotspots due to loose or faulty connections. Early detection and correction of such problems can prevent catastrophic failures.
Viewing Windows
Viewing windows lack infrared compatibility. They only allow visual inspections. Technicians perform visual checks inside the cabinet. Manufacturers typically make viewing windows of glass rather than crystal. Manufacturers construct some viewing windows from stronger materials, particularly for industrial applications. Broken glass can be a serious risk.
You can also check the pressure, temperature, and fluid level gauges without opening the cabinet. Likewise, you can inspect the bushings or cable terminations. You won’t be capable of taking a temperature reading through the window.
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Should You Get Both?
IR windows offer both thermal and optical monitoring. They are therefore a great choice. If you do not need thermal monitoring then viewing windows are a great option. It is possible that viewing windows are also less expensive. These windows are ideal for checking the position of mechanically controlled switches.
Installing IR & Viewing Windows
Maddox can add a viewing window or an IR to any transformer that you order. On request, we’ll add this feature to newly built or reconditioned transformers.
You can install viewing and infrared windows if you already have a transformer installed. This is a relatively simple process.
Where to Put an IR Window
When you install an IR window, place it so you can easily measure the temperature of the bushings.
You can strategically place the IR window to see gauges through it as well. You won’t require a separate window for gauge viewing if you do this.
Where to Put a Viewing Window
Installing a viewing glass is a good way to ensure you can see the gauges you want to monitor. You should place the window so that you can see the gauges for liquid level, pressure vacuum, and/or temperature.
Contact us at Electrical Transformer Buyers if you have any questions regarding viewing or IR windows.