Question

Which one of the following is the main cause of creeping in the induction type energy meters?

• A. Friction compensation
• B. Lag/lead compensation
• C. Overload compensation
• D. Braking torque producing system

Hint:

Creeping? → Usually due to too much friction compensation. Use anti-creep holes or magnets to fix it.

Answer 1

The Correct Option is A

Step 1: What is Creeping?
Creeping refers to the phenomenon where the energy meter disc rotates slowly even when there is no load (no current flowing through the current coil). This leads to an erroneous energy reading.
Step 2: Main Cause – Overcompensation for Friction
Friction compensation is introduced in energy meters to ensure the disc starts moving at low loads by using an additional shading band or magnetism.
However, excessive friction compensation can cause:
- Torque generation even at zero load → creeping.
Step 3: Other Causes (Less Likely)
- Stray magnetic fields,
- Vibrations,
- Improper calibration or manufacturing defects.
Step 4: Remedies for Creeping
- Drill holes in the disc (anti-creep holes).
- Use shading rings properly tuned to avoid overcompensation.
Conclusion:
Option (1) is correct — overcompensated friction mechanisms are the main cause of creeping in induction-type meters.