PCE 2017 Day 2 Paper 1 (Electrical) Q7 SC Calculation

Q7. Calculation of fault current… What is the prospective short circuit current  at the end of a 100m, 70mm2, 4C cable connected to a secondary of a 1500 kVa Transformer, 11/0.4 kV, 5.65% Z. The cable reactance is 0.0751 ohm/km and the resistance is 0.3342 ohm/km. The Utility SC level is 50kA at the primary side of the transformer.

1. Answer 1 (Based on IEC 60909 definition for PSCC)

So what is prospective short circuit current? (IEC 60909)
1.3.3 Prospective (available) short-circuit current
Current that would flow if the short circuit were replaced by an ideal connection of negligible
impedance without any change of the supply

This is one KBAT question for Malaysian Professional Electrical Engineers.

The calculation below is to ultimately calculate the peak current or making current, most websites define the prospective short circuit current as the peak current. However, those definitions kind of differ from the IEC 60909 definition for PSCC.

PCE Related Acts and Regulations

Peace be upon all of you

Based on the syllabus for the Professional Competency Examination and Electrical Discipline, these are most of the acts and regulations mentioned, especially in preparation for the Common  Paper 1. 

Info on allowance to bring in printed and binded books.

Here are the links to the docs from related government websites. I pray and wish all the best of luck to all the candidates sitting for PCE this coming 29th and 30th November 2017.

Economy Resistor in Vacuum Contactor Unit

1. What is economy resistor?
A resistor placed in series with the DC closing coil of the VCU or other type of DC coil to limit the current to the closing coil during running. Used with DC contractors category DC-14.

2. Operation example of a TAMCO 3.3kV VCU
- RL-2 and RL-3 closes when RL relay energized.
- CC energized via CC (NC) contact
- CC (NC) opens and CC is energized via RES resistor (economy resistor) to limit the current.

2017 BEM's Professional Competency Examination is now open for registration.

Update 26 Oct 2017

BEM has updated their website on the PCE.

• Competency Examination
• Form for registration, information for application to sit for the examination and PCE Regulations Booklet 2017.
• Syllabus for Common, Civil. Electrical, Mechanical, Chemical, Environmental and Marine Papers

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Peace be upon all of you!

Hi everyone,

BEM has finally released the registration form for the Professional Competency Examination (PCE) which currently covers 4 disciplines which are Chemical, Civil, Mechanical and Electrical. For other discipline, you (registered P. Eng.) must write to BEM.

As per BEM's website, the examination is planned to be on 29th and 30th of November 2017 in Kuala Lumpur. The fees will be RM 1,100 for first timers, and RM 600 for those who re-sit. I wonder when was the 1st PCE held?

Based on the latest information from BEM's Examination Department, the closing date for the registration is 30th Oct 2017.

You can read my previous post on BEM's 2017 Professional Competency Examination.

You may download the 2017 PCE-A form here! 

BEM's 2017 Professional Competency Examination for Mechanical, Civil and Electrical

BEM's Professional Competency Examination

Calling all Professional Engineers (Without Practicing Certificate), BEM will be having its 2017 Professional Competency Examination (PCE) on 29-30 November 2017. Fees are at RM1,000 + RM100 processing fee.