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Webinar 1 Q&A

Q1Hello Keith, is it a requirement for re-training of Authorised Electrical personnel and how often?
Justice Mnoneleli Justice Makaula
Training for authorised personnel shall always be in accordance with national electricity regulations.
International Guidance on Safe Working Procedures etc for AGL & Personnel can be found in IEC Documents ( IEC 61820 + IEC 62143 )
The periodicity for re-Authorisation of an Authorised Personnel (iaw the relevant Electricity Regulation) is nominally at a period not exceeding 3 years.
Q2Do you think AGL, particularly the Approach element - will remain relevant going into the future?
Nathan Clark
Quite simply … YES !
To rely solely on instrumentation and or automated operation within the aviation sector, and specifically where human life & safety is involved, will need human intervention in the event of “technology” failure.
I do believe that, albeit technology advances will continue to be introduced, visual cues during landing will be here to stay for the foreseeable future !
Q3I think maintenance personnel must have personnal logbook to record their activities
Mohammad Ghashghaei
Hi … As discussed, the introduction of a Log-Book system for AGL Engineering Personnel is an excellent concept. It will bring AGL Engineering Personnel in-line with other Aviation operational & technical personnel.
As reported, ICAO within their Safety Oversight investigations identified Critical Element 4 as the LACK of QUALIFIED TECHNICAL PERSONNEL.
How can you realistically justify/demonstrate experience & competency without having “recognised & approved” records.
Q4During the open ckt of ccr does the open ckt voltage exceed 3 times of 4500V
In a standard 6.6 amp AGL series circuit, the voltage output on the terminal of the Constant Current Regulator (CCR) is solely dependent upon the size of the electrical load.
Eg If the AGL primary circuit current is to remain constant, & the load is a fixed value, then the only variable element is the voltage (RMS) output from the CCR.
In the event of OPEN CIRCUIT in the field primary circuit, the electrical load value becomes infinite.
The design of a CCR is such that it will endeavour to keep the current at its selected constant current value.
As a consequence, the output voltage of the CCR will rise to its RMS maximum capability ( ie, this is dependent upon the KVA size of the CCR ).
At this maximum value, there is a safety circuit trip facility in the design of CCR’s to switch off the CCR !
HOWEVER, there is a time constant value until the actual safety trip is effective.
It is during this time period when the CCR output voltage could reach many times the RMS maximum voltage output capability of the CCR !
Each CCR manufacturer will advise the “nominal” MAX voltage value for their equipment should this occur !
NOTE : IEC 61822, the CCR Technical Design Document, calls for the CCR safety trip to switch off the CCR by two (2) times the RMS output value of the respective CCR .
eg. A 30KVA CCR at max load operating at a 6.6 amps current output will have an RMS output value of 4545 volts (Ohms Law).
Consequently, the voltage at the output terminal BEFORE disconnection, will be at a MINIMUM value of approx 9000 volts before the output is isolated.

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