Trip-Free Circuit Breaker – Definition, Applications and Standards
I. Definition A trip-free circuit breaker is a type of circuit breaker that cannot be manually held in the “ON” position when an electrical fault occurs. It will automatically trip …
Philippine Electrical Code – Equipment Grounding and Bonding
The 2017 edition of the Philippine Electrical Code (PEC), Part 1, closely aligns with the National Electrical Code (NEC) and provides specific provisions related to equipment grounding and bonding. These …
Point-on-Wave (PoW) Switching
Definition Point-on-Wave (PoW) switching is a technique used in power systems to control the precise timing of circuit breaker operations in relation to the waveform of the alternating current (AC) …
Importance of Surge Impedance Loading (SIL) in Transmission Lines
Introduction The demand for power is steadily increasing every year, leading to a growing gap between power supply and demand. This gap can be addressed by either adding new generation …
Significance of K factor in High VoltageCircuit Breaker Ratings
High Voltage Circuit Breaker Interrupting Rating The interrupting ratings of a high-voltage circuit breaker are primarily defined by two parameters: the rated short-circuit current, I, and the rated maximum voltage, …
Philippine Electrical Code – Ambient Correction Factor for Cables
Temperature in the Philippines According to PAGASA data, the average mean annual temperature across all weather stations in the Philippines, excluding Baguio, is 26.6°C. The coolest month is January, with …