Ver Pangonilo, PEE RPEQ

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Arc Flash Incident – 13.8 kV Indoor Switchgear

Posted by Ver Pangonilo on September 16, 2018 under Safety

An indoor 13.8kV Vacuum Circuit Breaker switchgear has an arc flash incident this week. Investigation results showed that the wet weather increased the humidity inside the switchroom, incomplete covering of bus bar joints (as-built condition),…

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Motor Protection -Direct Temperature Sensing

Posted by Ver Pangonilo on September 9, 2018 under Protection

The service life of electric motors is dependent on two (2) main components: Electrical components (i.e. windings & insulations); Mechanical components (i.e. core, shaft, bearings, frame and cooling system). The most common causes of electric…

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Objectives of Grounding System

Posted by Ver Pangonilo on September 7, 2018 under Design, Safety

To ground or not to ground is a decision that an Electrical Engineer needs to make when planning or modifying an electrical power distribution system. The decision is dependent on the requirement of the loads….

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Grounding and Bonding Permitted Methods

Posted by Ver Pangonilo on September 5, 2018 under General

Grounding is one of the most taken for granted provision of the Philippine Electrical Code. The incompetence of Electrical Inspectors make this practice worst. I inspected the grounding system of a 13.8kV Ring Main Unit…

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IEC 60909 vs ANSI/IEEE 141 Short-Circuit Current Calculations

Posted by Ver Pangonilo on August 27, 2018 under Design, IEC, IEEE

Short-circuit calculation is one of the most important work to be undertaken in plant power distribution. A comprehensive, detailed and accurate short-circuit currents will be used in switchgear selection, protection settings and coordination. Traditional short-circuit…

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Tutorials

MVA Method

At this times where supercomputers could fit into a mobile phone and utility softwares are always available to do particular tasks, most Electrical Engineers tend to forget how to implement hand calculations, have already forgotten…

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Short Circuit Study
What is a Short Circuit Study? A short circuit...
MVA Method Short Circuit Calculation
A Short Circuit Study is an important tool in...
MVA Method Load Flow Calculation
In previous tutorials for the MVA method, we have...
MVA Method for 3-Winding Transformer
In previous tutorials, the examples provided were mostly for...
Complex MVA Method – Part 3
In Part 2, we have seen how to combine...
Complex MVA Method – Part 1
The normal MVA method, despite its simplicity, provides only...
Complex MVA Method – Part 2
After presenting the equations that we will be using...
Complex MVA Method – Part 4
In Part 1, Part 2, and Part 3 of...
Short-circuit apparent power of the system
When doing power systems study, it always the predicament...
Combining KVAs
KVAs in series. The total KVAs in series (KVAtotal)...

Cable Selection

Cable Selection – Single Phase Earth Conductor Sizes Fault Loop Impedance High Voltage Cable Selection – Underground

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Cable Selection – Single Phase
Note: This will be the first of a series...
Fault Loop Impedance
Note: This is the second part of a series...
Cables Selection for Motors
When selecting a suitable cable size for a motor,...
High Voltage Underground Cable Selection
Unlike the other Cable Selection tutorials which deals with...
Earthing Conductor Sizes
The following table lists the recommended minimum sizes of...
Arc Flash Hazards
It's not too long ago that arc flash hazards...
IEEE 1584 Arc Flash Calculations
IEEE 1584 provides empirical formulas for determining arcing fault...
Time-Current Curves Using Excel – Part 1
In these articles, I have discussed the methodology on...
Time-Current Curves
Discrimination & coordination using Time-Current Curves TC Curves Part...
Time-Current Curve Part 2 – Discrimination
In Part 1, I have discussed the basics of...
Voltage Drop Calculation
This article provides a guideline on the selection of...

Profile

Ver Pangonilo

Ver Pangonilo, PEE RPEQ

A Registered Professional Engineer of Queensland (RPEQ), Professional Electrical Engineer (PEE – Philippines) and certified hazardous areas electrical designer with more than 20 years experience in concept definition, front-end engineering (FEED), HV & LV detail design, 3D model reviews, work share, construction and commissioning of Hazardous and Non-Hazardous Area electrical installations in water pipeline and pumping facilities, offshore platforms, FPSO, oil & gas process plants and pipelines including related facilities; experience in instrumentation and control, hazardous area classification for explosive gas and combustible dust atmospheres including intrinsically safe calculations and Computerised Maintenance Management Systems (CMMS).
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