{"id":2636,"date":"2022-02-25T14:39:22","date_gmt":"2022-02-25T17:39:22","guid":{"rendered":"https:\/\/transformadoresuniao.com.br\/?p=2636"},"modified":"2022-02-25T14:48:20","modified_gmt":"2022-02-25T17:48:20","slug":"learn-about-routine-tests-on-dry-type-transformers","status":"publish","type":"post","link":"https:\/\/transformadoresuniao.com.br\/en\/conheca-os-ensaios-de-rotina-em-transformadores-a-seco%ef%bf%bc\/","title":{"rendered":"Learn about routine tests on dry-type transformers"},"content":{"rendered":"

The Brazilian standard (ABNT - NBR 5356) establishes that all transformers must undergo routine tests. Do you know what that means?<\/span><\/p>\n

<\/p>\n

The use of dry-type transformers is commonly found in spaces that require medium or low voltage power adaptation, such as data centers, airports, hospitals, and commercial buildings. This is because they offer a<\/span> series of benefits<\/span><\/a>, as greater security, reduced space, and low maintenance levels.<\/span><\/p>\n

The Brazilian standard (ABNT \u2013 NBR 5356) establishes that all transformers must undergo routine tests.<\/span><\/p>\n

Routine testing
<\/b>Routine tests are tests performed to ensure the proper functioning of a transformer.<\/span><\/p>\n

Check below to see what these tests are:\u00a0<\/span><\/p>\n

Turns ratio test
<\/b>The purpose of this ratio is to ensure that the number of turns between windings conforms to the design, thereby ensuring that the input and output voltages remain within a range that does not deviate by more than +\/- 0.5% and that the actual values fall within the specified range.<\/span><\/p>\n

Ohmic resistance test of windings
<\/b>The essay aims to compare calculated values with measured values and to check for loose connections and interruptions.<\/span><\/p>\n

Insulation resistance test
<\/b>Verify solid insulation levels of transformers between windings and ground.<\/span>\u00a0<\/span><\/p>\n

Applied Stress Test
<\/b>It consists of applying a specific voltage to the equipment within the range determined by the standard, and there must be no insulation breakdown.<\/span><\/p>\n

Induced Tension Test
<\/b>The test consists of applying double the nominal voltage, at a frequency of at least 120Hz for the standardized calculated time. No disruptive discharges are allowed.<\/span><\/p>\n

\u00a0<\/span>No-load test and excitation current
<\/b>Perform loss measurements through nominal voltage and frequency, and compare the obtained values with the design and standard.<\/span><\/p>\n

Short-circuit Losses and Impedance Test
<\/b>Measurements of losses are performed using nominal current and frequency, and the obtained values are compared with the design and the standard.<\/span><\/p>\n

Partial discharge measurement
<\/b>Fundamental test for verification of material and process variables during the manufacturing period.<\/span><\/p>\n

The process requires strict control of productive activities and monitored follow-up.<\/span><\/p>\n

The equipment is subjected to standard values and times. The results must be evaluated and compared according to ABNT NBR 5356.<\/span><\/p>\n

\u00a0<\/span><\/p>\n\n\n

 <\/p>","protected":false},"excerpt":{"rendered":"

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