Projects:2017s2-291 Measurement of Transformer Parameters - Revision history

A1679357: /* Data analyzing */

2018-06-05T05:24:40Z

‎Data analyzing

2018-06-05T05:24:06Z

‎Data analyzing

2018-06-05T05:23:52Z

‎Method

2018-06-05T05:23:32Z

‎Data analyzing

2018-06-05T05:23:17Z

‎Data analyzing

2018-06-05T05:22:52Z

‎Data analyzing

2018-06-05T05:22:09Z

‎Data analyzing

2018-06-05T05:21:20Z

‎Findings

2018-06-05T05:21:18Z

‎Method

2018-06-05T05:20:50Z

‎Data analyzing

@@ Line 50: / Line 50: @@
 To obtain the overall variation of the impedance and to avoid damage to any of the devices, the input voltage range for all AC tests was as large as it could be possible. The Matlab file saturation.m programming for accumulate impedance and plot the curve. From these two curves, it is clear that the impedance of first circuit is varying with the condition of operation with a trend similar to that of the PMG choke. The resistance and reactance didn’t reach the peak value at the same time as well. However, there is no air gap in the two-port transformer and that is the reason why the impedance reached the peak value and decreased sharply instead of staying at the peak value for a wider voltage range. The peak of the curve is where the transformer reaches saturation.
-[[File:curve 1.png|400px|border|left|middle|emf vs R curve of two-port #1 test, for 50-240V ]]
+[[File:curve 1.png|400px]]
-[[File:curve 2.png|400px|border|center|middle|emf vs L curve of two-port #1 test, for 50-240V ]]
+[[File:curve 2.png|400px ]]
 =Findings=

@@ Line 49: / Line 49: @@
 =Data analyzing=
 To obtain the overall variation of the impedance and to avoid damage to any of the devices, the input voltage range for all AC tests was as large as it could be possible. The Matlab file saturation.m programming for accumulate impedance and plot the curve. From these two curves, it is clear that the impedance of first circuit is varying with the condition of operation with a trend similar to that of the PMG choke. The resistance and reactance didn’t reach the peak value at the same time as well. However, there is no air gap in the two-port transformer and that is the reason why the impedance reached the peak value and decreased sharply instead of staying at the peak value for a wider voltage range. The peak of the curve is where the transformer reaches saturation.
 [[File:curve 1.png|400px|border|left|middle|emf vs R curve of two-port #1 test, for 50-240V ]]

@@ Line 44: / Line 44: @@
 For measured Zin, the setting up of equipment which including power analyser, oscilloscope for measurement and using varic for power supply. In order to keep current consistency, the Zin for cross connection should be discharged, thus we have 4 Zin to collect. We regarding 4 Zin which has same current as a group, we measure 11 times to get 11 groups of Zin. Actually we have done a lot measurements for these 6 Zin, but only these 11 groups of Zin has the consistency current and useful, I will demonstrate specifically in this sub-section of measured Zin.
 The sub-section Matlab method is mainly about the method and approach for data analysis.
 =Data analyzing=

← Older revision		Revision as of 05:23, 5 June 2018
Line 50:		Line 50:

	[[File:curve 2.png\|400px\|border\|center\|middle\|emf vs L curve of two-port #1 test, for 50-240V ]]		[[File:curve 2.png\|400px\|border\|center\|middle\|emf vs L curve of two-port #1 test, for 50-240V ]]
−
−	~~[[File:curve 3.png\|400px\|border\|right\|middle\|B-H curve of two-port #1 test, for 50-240V ]]~~

	=Findings=		=Findings=

@@ Line 47: / Line 47: @@
 =Data analyzing=
 To obtain the overall variation of the impedance and to avoid damage to any of the devices, the input voltage range for all AC tests was as large as it could be possible. The Matlab file saturation.m programming for accumulate impedance and plot the curve. From these two curves, it is clear that the impedance of first circuit is varying with the condition of operation with a trend similar to that of the PMG choke. The resistance and reactance didn’t reach the peak value at the same time as well. However, there is no air gap in the two-port transformer and that is the reason why the impedance reached the peak value and decreased sharply instead of staying at the peak value for a wider voltage range. The peak of the curve is where the transformer reaches saturation.
-[[File:curve 1.png|400px|border|left|baseline|emf vs R curve of two-port #1 test, for 50-240V ]]
+[[File:curve 1.png|400px|border|left|middle|emf vs R curve of two-port #1 test, for 50-240V ]]
-[[File:curve 2.png|400px|border|center|baseline|emf vs L curve of two-port #1 test, for 50-240V ]]
+[[File:curve 2.png|400px|border|center|middle|emf vs L curve of two-port #1 test, for 50-240V ]]
-[[File:curve 3.png|400px|border|right|baseline|B-H curve of two-port #1 test, for 50-240V ]]
+[[File:curve 3.png|400px|border|right|middle|B-H curve of two-port #1 test, for 50-240V ]]
 =Findings=

@@ Line 48: / Line 48: @@
 To obtain the overall variation of the impedance and to avoid damage to any of the devices, the input voltage range for all AC tests was as large as it could be possible. The Matlab file saturation.m programming for accumulate impedance and plot the curve. From these two curves, it is clear that the impedance of first circuit is varying with the condition of operation with a trend similar to that of the PMG choke. The resistance and reactance didn’t reach the peak value at the same time as well. However, there is no air gap in the two-port transformer and that is the reason why the impedance reached the peak value and decreased sharply instead of staying at the peak value for a wider voltage range. The peak of the curve is where the transformer reaches saturation.
 [[File:curve 1.png|400px|border|left|emf vs R curve of two-port #1 test, for 50-240V ]]
 [[File:curve 2.png|400px|border|center|emf vs L curve of two-port #1 test, for 50-240V ]]
 [[File:curve 3.png|400px|border|right|B-H curve of two-port #1 test, for 50-240V ]]
 =Findings=

← Older revision		Revision as of 05:21, 5 June 2018
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	Two-port model is more complicate than one port model, but the method we used to get parameters is similar as one-port model. Doing open circuit and short circuit for primary side (240V) of transformer and secondary side (24V) and two cross connection tests. Each case of these tests can be regard as one-port test and collect Vin and Iin for each test to calculate Zin based on ohms law.		Two-port model is more complicate than one port model, but the method we used to get parameters is similar as one-port model. Doing open circuit and short circuit for primary side (240V) of transformer and secondary side (24V) and two cross connection tests. Each case of these tests can be regard as one-port test and collect Vin and Iin for each test to calculate Zin based on ohms law.
	For sub-section Zin model, as we have 6 Zin for open circuit connection, short circuit connection and cross connection, we derive formula for these six Zin based on R1, X1, R2, X2, Rc and Xm then substitute rough parameters we get from section 4 into our derived formula.		For sub-section Zin model, as we have 6 Zin for open circuit connection, short circuit connection and cross connection, we derive formula for these six Zin based on R1, X1, R2, X2, Rc and Xm then substitute rough parameters we get from section 4 into our derived formula.
		+
		+	[[File:Two_port_test_box.png\|400px]]