Question

1. With regards to electrical noise and inductive coupling, explain the purpose of running current carrying conductors in their own raceway separate from signaling cables.  Does the type of raceway material, ferrous vs non-ferrous make difference?

2. When it comes to load switching on power systems, transients are unavoidable. Discuss how switching on and off inductive and capacitive loads contribute to this problem.

3. List two materials commonly used in TVSS (Transient Voltage Surge Suppressors).  As well,

UL 1449 uses 3 categories when rating Surge Protective Devices (SPD) / Transient Voltage Surge Suppressors (TVSS).  List the categories and explain how they apply to a TVSS’s performance.

4. In the case of the vibrating transformer, discuss the following;

• detection method used to find the problem,
• the problem itself,
• what can be repaired on the transformer or external equipment to prevent the vibrating and buzzing noise?

Answer 1