Insulation plays a very important role in an electrical system. Without electrical insulation, the electricity flowing in the conductors is exposed to short circuit to other conductors or create the risk of electrocution to personnel. It is important to always check the integrity of insulation to ensure the safety and reliability.
Low resistance measurements are a valuable part of electrical system reliability. This type of testing helps to identify high impedance electrical connections that can result in excess heating, losses and potentially failure of power system components.
Often, the breakdown of unsuspecting components can trigger failures and result in hazardous conditions to patients, doctors, medical personnel and facility devices.
The capacitor discharge technique is performed with a surge generator, nicknamed “thumper.” This device converts line power into high voltage, unidirectional, impulses that are transmitted into a faulted power cable. A simplified circuit of a surge generator connected to a faulted cable is shown in Figure 1.
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