CARA PENGETESAN MEGGER (INSULATION TESTER) SECARA DETAIL! #2

Summary

This video explains the process of performing insulation and dielectric tests on electrical panels. The Megger test measures insulation resistance to prevent electrical leakage, while the iPod test applies a high voltage (2,500 volts) to assess the panel's ability to handle operational stress without leakage. Both tests are crucial for ensuring the safety and reliability of electrical systems. The video covers the preparation steps, safety measures, testing procedures, and how to document the results to meet regulatory standards, ensuring that the panel is fit for use.

Takeaways

• 😀 The megger test measures the insulation resistance of electrical panels to ensure no leakage of current through the insulation.
• 😀 The hipot test (high-voltage test) applies 2,500 volts to the electrical panel to check for any leakage current under high-stress conditions.
• 😀 Both tests are crucial in determining the safety and usability of electrical panels, ensuring they meet industry standards.
• 😀 The megger test requires measuring the insulation resistance between various points of the panel, including phase-to-neutral and neutral-to-ground.
• 😀 A resistance value below 20 Megaohms during the megger test indicates poor insulation, which could be a safety risk.
• 😀 During the hipot test, a voltage of 2,500 volts is applied for one minute, and any leakage current above the acceptable threshold will trigger an alarm.
• 😀 If the leakage current during the hipot test is below the defined threshold (e.g., 0.06 mA), the panel passes the test and is considered safe.
• 😀 The process involves disconnecting control panels and ensuring all components are properly set before conducting the tests.
• 😀 The tests are conducted sequentially, starting with the megger test followed by the hipot test, to evaluate the panel’s insulation under normal and high-stress conditions.
• 😀 Proper documentation of test results, including leakage currents and resistance values, is essential for confirming compliance with electrical safety standards.

Q & A

What is the main purpose of using an insulation tester (megger) in this process?

The main purpose of using an insulation tester (megger) is to measure the resistance of the insulation in the electrical panel, ensuring there is no leakage of current. It helps identify any weaknesses in the insulation that could cause potential failures.

What voltage is used during the high voltage insulation test, and why?

A voltage of 2,500 volts is used during the high voltage insulation test. This is to test whether the insulation in the panel can withstand higher-than-normal voltages, as the usual operating voltage is 380 volts. The test helps to identify if there is any leakage of current under higher stress.

What are the three main phases involved in this testing process?

The three main phases involved are: 1) Pre-test (using a megger), 2) Dielectric or high-voltage insulation testing (using 2,500 volts), and 3) After dielectric testing to verify the results.

Why is it important to disconnect the controller and lights before performing the insulation test?

It is important to disconnect the controller and lights to avoid any potential short circuits or incorrect readings during the insulation test. This ensures accurate results without interference from other electrical components.

What values should be recorded during the insulation testing?

The values recorded during insulation testing include the resistance readings between the different phases (phase-to-phase, phase-to-neutral, and neutral-to-ground), which should meet the minimum standard set by regulations, typically 20 MegaOhms.

What is the purpose of the high-voltage injection (2,500 volts) during the test?

The purpose of injecting 2,500 volts during the test is to challenge the electrical panel's insulation. This is to check if the panel can handle a higher-than-usual voltage without leakage, which would indicate insulation failure or weakness.

How long is the high-voltage insulation test typically conducted?

The high-voltage insulation test is typically conducted for one minute. During this time, the current leakage (if any) is measured and recorded.

What indicates that a panel has passed the insulation test?

A panel passes the insulation test if the measured current leakage remains within acceptable limits, typically below the threshold specified by the standard (e.g., 20 MegaOhms). If the leakage is too high, it indicates a failure.

What happens if the panel fails the insulation test?

If the panel fails the insulation test, it means that the insulation is inadequate, and the panel is not suitable for use until repairs or replacements are made. A high leakage current indicates poor insulation or faults in the electrical components.

What should be done after completing both the insulation and high-voltage tests?

After completing both the insulation and high-voltage tests, the results should be recorded, including any leakage measurements. The panel should then undergo a final check to ensure all components are safe and properly functioning before it is reconnected and used.