Volt-amperes (VA) would be sufficient since active power (W) cannot be greater than VA. (recall the power triangle)
I’d rather use “power” not “active power”, since “active” doesn’t add anything to the definition of that term. I would avoid ambiguity such as, “…ports of significant burden “ And, 125 V is a poor example because it is not a nominal voltage in North America. It’s 120 V or 120/240 V or 120/208 V – those are common nominal values found in low-voltage distribution for residential and commercial buildings in North America. Ralph From: Boštjan Glavič <[email protected]> Sent: Thursday, August 22, 2024 9:51 PM To: '[email protected]' <[email protected]>; [email protected] Subject: RE: [PSES] Burden test Thank you all. I decided to contact TC57 which prepared this standard and let’s see. When I went once more through standard, I think it is really like apparent power. So it shall be equal to power consumption of power supply under normal load. Below extract from standard – clauses with word Burden. Best regards, Boštjan 5.4 Rated burden The burden for the power supply (a.c. including power factor/d.c.) at quiescent state and maximum load. The maximum start-up inrush current of the power supply circuits shall also be stated. 6.1.3 Auxiliary supplies, I/O 6.1.3.1 General requirements for marking For marking the following should be taken into account: • a.c. – with symbol 2 of Table 3 and rated frequency or frequency range; • d.c. – with symbol 1 of Table 3; • symbol 3 of Table 3 on equipment for a.c. and d.c. supply; • a hyphen (-) shall be used to separate the lower and upper nominal voltages, for example, 125 V-230 V; • the burden in watts (active power) or volt-amperes (apparent power) or the rated input current, with all accessories or plug-in modules connected. The documentation shall specify the burden of individual digital inputs, output relays and other I/O ports of significant burden in order for the user to calculate the worst-case burden for the equipment application. The values shall be measured with the equipment powered at nominal voltage, but not be operational. The measured value shall not exceed the marked value by more than 10 %; 6.1.3.2 Auxiliary supply The following information shall be provided on the equipment and in the documentation: • a.c. and/or d.c. supply; • the rated values. • in the documentation: • the burden. 6.1.3.3 Inputs The following information shall be provided in the documentation: • a.c. and/or d.c. supply; • the rated values; • burden on the supply input. 6.1.3.4 Outputs The following information shall be provided in the documentation: • the kind of output, for example, relay, optocoupler etc; • burden on the supply input; • the switching capability on/off; • the switching voltage; • the permissible current, continuous value and short time value for 1 s; • withstand voltage across open contacts. Compliance with 6.1.3.1 to 6.1.3.4 is checked by inspection or by measurement. 6.8 Burden test Burden 6.8.1 for AC power supply 6.8.1.1 Typical load condition The equipment is powered at rated auxiliary energizing voltage with typical load of all input and outputs. The test shall be carried out by voltamperes (VA) measurement. The maximum value of 5 consecutive tests shall be used for burden claim. 6.8.1.2 Inrush current and power-up duration The equipment is switched on at rated auxiliary energizing voltage. The peak value of input current during power-up, the duration from switching instant to the instant that input current gets to within 10 % of quiescent state current shall be recorded. The maximum value of 5 consecutive tests shall be used for inrush current and power-up duration claim. From: Ralph McDiarmid <[email protected] <mailto:[email protected]> > Sent: Thursday, August 22, 2024 9:23 PM To: [email protected] <mailto:[email protected]> Subject: Re: [PSES] Burden test CAUTION: This email originated from outside of our organisation. Do not click links or open attachments unless you recognise the sender and know the content is safe. I agree with John’s comment. I will add that standard writing panels (committees) should use their vocabulary with intelligence. Any ambiguous terms should be defined somewhere in part one of IEC 61850. I don’t have a copy, and the IEC preview doesn’t help. I will hazard a guess that in this context, the adjective “intelligent” means a power supply that is able to communication over a network for the exchange of data and for remote control or configuration. Ralph From: John Woodgate <[email protected] <mailto:[email protected]> > Sent: Thursday, August 22, 2024 10:41 AM To: [email protected] <mailto:[email protected]> Subject: Re: [PSES] Burden test I think you are required to state the power consumption of every port that consumes power. If your SMPS really is 'intelligent', then the standard applies. But I wonder what the relevant definition of 'intelligent' is. There appears to be no method of measurement for IQ! On 2024-08-22 17:53, Richard Nute wrote: Hi Bostjan: While this does not answer your specific questions, it may be helpful: https://en.wikipedia.org/wiki/IEC_61850 Good luck, and best regards, Rich From: Boštjan Glavič <mailto:[email protected]> <[email protected]> Sent: Thursday, August 22, 2024 4:32 AM To: [email protected] <mailto:[email protected]> Subject: [PSES] Burden test Dear all, Is anyone familiar with burden test according IEC 61850-3 standard? Is this test applicable for switch mode power supply with AC input and DC output? How to conduct the test? What is the idea of the test? Standard is not really clear. Thank you for your support. Best regards, Bostjan _____ This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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