• Vittrup posted an update 1 year, 2 months ago

    In HVT (High Voltage Technology), any voltage above 11 kilo-volts is considered to be from the high voltage range. It may either be alternating or direct current. Majority of industries are provided with this range of voltages from the national grid although some generates their very own high voltage power using power generators. Extremely high voltages are generally stepped right down to some specific lower voltages, to own their electrical machinery for example motors, heaters, HVAC systems, amongst others. Because of these industries, regular checks must be conducted by authorized personnel to assess the health of their equipment. Equipment exams are very essential in determining the soundness of an machine in order to avoid equipment breakdown and big production losses. These tests also aid in determining if a newly purchased tools are worth, before setting it up. Most manufacturers use hollywood testing to evaluate the insulation of their equipment before supplying them with their customers.

    The main advantages of applying high profile insulation testing are usually looked down upon by many people industries, being a technique of determining the conditionality of their electrical equipment. This could be greatly related to the fact that much pressure and emphasis is usually place on production activities with the tariff of proactive upkeep of the apparatus. A reliable and efficient insulation with an electrical machine is so very important for the correct operation each time. Since insulation of apparatus degrades eventually, the respective electrical department for almost any industry should be regularly conducting regular check-ups for machines as part of their normal working schedule. Do that to even low and medium voltage systems.

    Typically, a four stage process is followed. The stages are briefly described below:

    In-process testing

    This is the most basic process which may be done even on the readily installed equipment, provided that it is not running. This process involves the using a meggering instrument to test the insulation integrity in the coils before it’s attached to phases, neutral, and earth. Occasionally, a multimeter may also be used. Inter-winding and winding-to-body resistances are checked at this time. Therefore, the dielectric withstanding voltage and insulation resistance with the coil can be discovered.

    Ancillary Equipment Testing

    This involves testing for insulation resistance and dielectric withstanding voltage for interconnecting cables, high profile bushings, busbars, and terminations. This is conducted if the components are interconnected or separated.

    Generator Assembly Test

    In this case the generator is visually inspected. Cleaning is completed and the machine’s stability can also be assessed. The heartbeat with the machine is observed at close range using a special display instrument. The equipment can be meggered for insulation resistance and dielectric withstanding voltage test.

    One of many things to consider in testing equipment are; voltage and right testing equipment. For the best dependable results testing voltage should be sufficient to effectively measure the insulating resistance. However, it should not be too much to overstress the equipment insulation. The best testing equipment which could effectively store results enables them to be held in some type of computer for archiving and analysis. This action saves time and decreases the chance of error.

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