EMJ42003 - QUIZ 2

The electrical characteristics of the insulators and other apparatus are normally referred to the reference _________ conditions

• humidity

• atmospheric

• temperature

• ambient

This test is used to determine the series branch parameters of the equivalent circuit. It is conducted on the high-voltage (HV) side of the transformer, where the low-voltage (LV) side (or the secondary) is short-circuited.

• Failure Detection

• Temperature Rise Test

• Impulse Test

• Short-Circuit Test

Tests on insulators can be divided into three types: power frequency tests, impulse tests, and ________.

• Pollution testing

• temperature rise test

• short-circuit test

• heat test

Test voltages consist of _____________.

• alternating voltages

• surge voltages

• direct voltages

• impulse voltages

This test simulates the effect of natural rain on external insulation and is recommended for tests on apparatus designed for outdoor use.

• Surge withstand test

• Impulse withstand test

• Wet withstand test

• Dry withstand test

In tests with impulse voltages, _________ methods are used to determine the applied voltage levels.

• short-and-long

• low-and-high

• up-and-down

• right-and-left

According to the British Standard specifications, any test voltages must be under these reference conditions:

Temperature: ___ ℃

Pressure: 1013 𝑚𝑖𝑙𝑙𝑖𝑏𝑎𝑟𝑠 (or 760 𝑡𝑜𝑟𝑟)

• Absolute humidity: 11 𝑔𝑚/𝑚³

• 100

• 20

• 50

• 10

Based on the graph, determine the absolute humidity during an AC flashover test at power frequency on a cap and pin insulator.

• 14

• 18

• 15

• 13

The figure displays the arrangement of the apparatus used in the ______ test system.

• impulse voltage

• power frequancy

• direct voltage

• alternating voltage

This test ensures that a product does not overheat during operation. It is performed by applying a rated voltage and frequency to the primary side of the transformer under test and a short-circuit winding in the secondary to circulate the rated current in the latter.

• Wet Withstand Test

• Temperature Rise Test

• Dry Withstand Test

• Power Frequency Test