17e32 – Transformer Heating Test
INSTRUCTIONS
PLEASE READ THESE INSTRUCTIONS CAREFULLY BEFORE COMMENCING
PLEASE TAKE SUITABLE SAFETY PRECAUTIONS AT ALL TIMES .
RETAIN THE TEST SAMPLE AFTER TESTING.
Introduction:
Participants are supplied with a transformer. The instructions require an input voltage to be applied
to the primary winding and a resistive load attached to the both of the secondary outputs.
Applicable Standards
•
•
IEC 61558-1
Due to the similarities in test procedures, other product standards may be applicable,
including: IEC 60335-1; IEC 60598-1; IEC 61010-1; IEC 60065; IEC 60950-1, IEC 62368-1 and
other standards requiring temperature rise tests using change in winding resistance method.
Participant Objectives:
By completing this PTP, participants may compare their results by change in resistance method to
determine heating of transformer primary and secondary windings.
Issued: 12 August 2016
(C) IFM Quality Services Pty Ltd
Page 1 of 3
17e32 – Transformer Heating Test
INSTRUCTIONS
Instructions:
1. Prior to testing, store the EUT in an ambient environment of 21°C – 25°C for at least 24 hours.
Maintain these environmental conditions while performing tests.
2. Test the EUT after fixing it onto the centre of a dull black painted plywood board with 2 screws.
The board shall be approximately 20 mm thick and have dimensions at least 300 mm x 300 mm.
The environment shall be free of draughts. The board shall sit level and horizontal.
3. Each input and output conductor should be 2 m long with thickness (cross sectional area) as
close as possible to 1.5 mm2. These 2 m long conductors are to be attached to any existing leads
of the EUT.
4. The test shall be conducted at 50 Hz.
5. Set up the EUT, power supply, and measuring equipment such that:
a) The input to the primary winding is 240 V ac.
b) Simultaneously, apply resistive loads to both secondary windings to achieve 2.0 A each.
c) The ambient (room) temperature is determined at a horizontal plane to the EUT
approximately 50 cm from the EUT.
d) The test is performed until steady-state conditions are reached.
e) The requested additional data relating to temperatures, time, current and voltage are
recorded and reported.
6. Assume the EUT has NO T-rating.
7. Measure the heating of all primary and secondary windings using the change in resistance
method.
8. For the calculation, use the factor 234.5.
9. Secondary winding 1 terminals are on the same side of the transformer as the primary winding
terminals.
a. Secondary winding 2 terminals are on the opposite side of the transformer as
the primary winding. (Secondary winding 2 is shown on the photograph on page
1.)
b. When loading the secondary windings, connect 0V-12V.
Due Date
The due date for results is 24th February 2017. Results will not be accepted via the online result
entry facility after this date. Results submitted after the due date will only be accepted upon
payment of an AUD$250 late fee.
Direct all questions or comments to: ingridflemming@ifmqs.com.au
Reporting the results:
For information regarding the reporting of results, please refer to the Result Entry Guide:
http://www.ifmqs.com.au/proficiency/Guides/Internet%20Result%20Entry%20Guide%20-%20Electrical.pdf
Refer to Table 1 for explanation of questions.
Issued: 12 August 2016
(C) IFM Quality Services Pty Ltd
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17e32 – Transformer Heating Test
INSTRUCTIONS
Table 1: Explanation of Questions
Question
number
Test/Question
Explanation
Each artefact has been screened and measurements recorded. Please verify the
unit number in the results entry screen. See top of artefact.
The IEC standard that has been applied for this PTP. If more than one standard is
to be applied, results for each standard MUST be recorded under a separate
participant entry.
Q01
Unit number
Q02
IEC Standard
Q03
Adjust voltage? (yes / no)
Q04
Initial voltage primary
Voltage applied to the input primary at the beginning of the test. (V)
Q05
Initial current primary
Current at the input primary at the beginning of the test. (A)
Q06a
Initial current secondary 1
Current at the secondary winding 1 at the beginning of the test. (A)
Q06b
Initial current secondary 2
Current at the secondary winding 2 at the beginning of the test. (A)
Q07a
Initial volts secondary 1
Voltage obtained at the secondary winding 1 at the beginning of the test (V)
Q07b
Initial volts secondary 2
Voltage obtained at the secondary winding 2 at the beginning of the test (V)
Q08a
Resistive load secondary 1
Value of the resistive load applied to achieve the required output current 1. (Ω)
Q08b
Resistive load secondary 2
Value of the resistive load applied to achieve the required output current 2. (Ω)
Q09
Initial ambient
Q10
Initial resistance primary
Q11a
Q11b
Initial resistance
secondary 1
Initial resistance
secondary 2
Is the applied voltage adjusted (either manually or automatically) during the test?
Ambient temperature at the beginning of the test. (°C)
Primary winding resistance at the beginning of the test. (Ohm)
Secondary winding 1 resistance at the beginning of the test. (Ω)
Secondary winding 2 resistance at the beginning of the test. (Ω)
Q12
Time to steady state
Time elapsed in minutes until steady state was reached. (min)
Q13
Final voltage primary
Voltage applied to the input primary after steady state was reached. (V)
Q14
Final current primary
Current at the input primary after steady state was reached. (A)
Q15a
Final current secondary 1
Current at the secondary winding 1 after steady state was reached. (A)
Q15b
Final current secondary 2
Current at the secondary winding 2 after steady state was reached. (A)
Q16a
Final volts secondary 1
Voltage obtained at the secondary winding 1 after steady state was reached. (V)
Q16b
Final volts secondary 2
Voltage obtained at the secondary winding 2 after steady state was reached. (V)
Q17
Final ambient
Q18
Final resistance primary
Q19a
Q19b
Final resistance secondary
1
Final resistance secondary
2
Ambient temperature after steady state was reached. (°C)
Primary winding resistance after steady state was reached. (Ohm)
Secondary winding 1 resistance after steady state was reached. (Ω)
Secondary winding 2 resistance after steady state was reached. (Ω)
Q20
Temp rise primary
Q21a
Temp rise secondary 1
Temperature rise of secondary 1 winding. (K)
Q21b
Temp rise secondary 2
Temperature rise of secondary 2 winding. (K)
Issued: 12 August 2016
Temperature rise of primary winding. (K)
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