CT.xlsx

	A	B	C	D	E	F
1	CT Phase Error Calculation
2				Formula (for editable fields)
3	Parameter	Unit	Description	1000
4	Core Outer Diameter	mm	Outer diameter of core	480
5	Core Inner Diameter	mm	Inner diameter of core	360
6	Core Height	mm	Height of the core (axial)	82
7	Cross-sectional Area	m^2	Calculated from OD and ID	0.0049
8	Mean Magnetic Path Length	m	Average magnetic path length	1.319
9	Frequency	Hz	Operating frequency	50
10	Relative Permeability		For nanocrystalline material	80000
11	Secondary Turns		Number of secondary windings	5000.0
12	Secondary Current	A	Rated secondary current	1
13	Secondary Voltage	V	Burden voltage	26.18
14	Magnetizing Inductance	H	Lm = µ₀·µr·A·N² / l	9371.4
15	Magnetizing Current	A	Im = Es / (2πfLm)	0.00001
16	Phase Error (rad)	radians	Im / Is	0.00001
17	Phase Error (minutes)	minutes	Radians to minutes	0.031
18
19
20
21				Name	Ohm
22				Resistance of Measuring Cable	0.05
23				Resistance of CT	26.124	0.0565
24				Resistance of Instrument	0.0065
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100