Only transformers whose primary purpose is to isolate circuits are routinely described as isolation transformers. Power transformers with specified insulation between primary and secondary are not usually described only as "isolation transformers" unless this is their primary function. Sometimes the term is used to emphasize that a device is not an autotransformer whose primary and secondary circuits are connected. Some specifications require that Isolation transformers be a part of the lightning protection on the AC circuits. Isolation transformers with electrostatic shields are used for power supplies for sensitive equipment such as computers, medical devices, or laboratory instruments. Suitably designed isolation transformers block interference caused by ground loops. Transformers that have a ratio of 1 to 1 between the primary and secondary windings are often used to protect secondary circuits and individuals from electrical shocks between energized conductors and earth ground. Isolation transformers block transmission of the DC component in signals from one circuit to the other, but allow AC components in signals to pass. A transformer sold for isolation is often built with special insulation between primary and secondary, and is specified to withstand a high voltage between windings. This isolation is used to protect against electric shock, to suppress electrical noise in sensitive devices, or to transfer power between two circuits which must not be connected. Isolation transformers provide galvanic isolation no conductive path is present between source and load. The grounded shield prevents capacitive coupling between primary and secondary windings.Īn isolation transformer is a transformer used to transfer electrical power from a source of alternating current (AC) power to some equipment or device while isolating the powered device from the power source, usually for safety reasons or to reduce transients and harmonics. JSTOR ( September 2010) ( Learn how and when to remove this template message)Ī 230 V isolation transformer A simple 1:1 isolation transformer with an extra dielectric barrier and an electrostatic shield between primary and secondary.Unsourced material may be challenged and removed.įind sources: "Isolation transformer" – news Please help improve this article by adding citations to reliable sources. Then, unscrew the ground loop screw on the back of your subwoofer.This article needs additional citations for verification. Connect the chassis screws on your sub and receiver with 14-gauge wire.(If this plug is a 3-wire plug, you won’t be able to reverse it.) Reverse the AC plug for your A/V receiver or subwoofer.Plug the subwoofer into a separate outlet from the rest of your setup.Finally, you can test these other procedures if you don’t have access to a ground isolator:.If the buzz remains even after you’ve disconnected the TV, you’ll need a ground isolator between the subwoofer and your A/V receiver.Check reviews before making your purchase to ensure your system is compatible. One issue to consider is that transformer-based isolators are universally compatible with analog feeds, but they may interfere with HDTV signals. If the hum disappears, the solution is to install an in-line ground isolator.Reconnect the subwoofer from its input to the receiver’s output and disconnect the offending feed from the outboard box or tuner (disconnect the cable before any splitters).If it does, the ground loop is probably coming in through your cable/satellite feed. Unplug the coaxial cable connected to your subwoofer and determine if the buzz vanishes. The main culprits are your subwoofer and cable or the satellite box feed at the entrance to your system.Here’s a troubleshooting procedure to determine what the cause of your ground loop is and what you can do about it:
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