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Strap Magnetic Circuits of Type for Three-Phase Transformers

Magnetic circuits are designed for use in AC small-power three-phase transformers with power line frequency of 50 and 400Hz, operating conditions of which are the following:

  • operating temperature limit from -60 to +150°;
  • relative air humidity up to 98% at temperature up to 40°;
  • atmospheric pressure reduced to 5mm Hg at ambient temperature up to 150°;
  • vibration within the range from 5 to 5,000Hz with acceleration up to 40g;
  • multiple impacts with acceleration up to 150g;
  • single impacts with acceleration up to 1,000g;
  • linear loads with acceleration up to 100g;
  • hoarfrost and dew influence;
  • salt spray atmosphere influence;
  • fungal mold influence.

Magnetic circuit production of amorphous nanocrystalline alloys is also possible

Standard Parameters and Dimensions

Magnetic circuits are produced according to Drawing 1, Table 1 and 2 out of hoop steel:

  • of Grade 3413, 21427.1-83, with a thickness of 0.35mm for power line frequency of 50Hz;
  • of Grade 3422, 21427.4-78, with a thickness of 0.15mm for power line frequency of 400Hz;
  • Chamfering 0.1450 is allowed on core rod butt ends;
  • Outer core rod displacement relative to each other for the value in defined position of middle core rod is allowed.
Magnetic Circuits of  Type

Magnetic circuit surfaces except specified 3, 2 are covered with enamel -140 of light grey colour. Use of enamels of other brands is allowed.

Table 1
Magnetic circuit reference designation a h h1 c L* H* B Rmax Magnetic circuit weight, kg
Nomin. Extr. dev. Rmax Nomin. Nomin. Nomin. Extr. dev.
12,520-25-0,35-50 +0,3 12,5 +0,24
-0,43
25,0 12,5 25 87,5 50,0 20 +0,84 1,2 0,485
12,520-29-0,35-50 29,0 12,5 54,0 0,505
12,520-33-0,35-50 33,0 16,5 58,0 0,525
12,520-38,5-0,35-50 38,5 16,5 63,6 0,550
12,520-440,35-50 44,0 22,0 69,0 0,580
 
1625-32-0,35-50 +0,5 16,0 +0,24
-0,43
32,0 16,0 32 112 64,0 25 +0,84 1,3 1,000
1625-37-035-50 37,0 16,0 69,0 1,050
1625-42-0,35-50 42,0   74,0 1,100
1625-49-0,35-50 49,0 21,0 81,0 1,180
1625-56-0,35-50 56,0 28,0 88,0 1,260
 
2032-40-0,35-50 +0,7 20 +0,28
-0,52
40,0 20,0 40 140 80,0 32 +1,0 1,4 1,960
2032-47-0,35-50 47,0 20,0 87,0 2,070
2032-54-0,35-50 54,0 27,0 94,0 1,170
2032-62-0,35-50 62,0 27,0 102,0 2,320
2032-70-0,35-50 70,0 35,0 110,0 2,480
 
2540-50-0,35-50 +,9 25 +0,28
-0,52
50,0 25,0 50 175 100,0 40 +1,0 1,5 3,82
2540-58-0,35-50 58,0 25,0 108,0 3,96
2540-66-0,35-50 66,0 33,0 116,0 4,15
2540-77-0,35-50 77,0 33,0 127,0 4,45
2540-88-0,35-50 88,0 44,0 138,0 4,75
 
324064-0,35-50 +1,0 32 +0,34
-0,62
64 32 64 224 128 40 +1,0   6,10
324074-0,35-50 74 32 138 6,45
324084-0,35-50 84 42 148 6,80
324097-0,35-50 97 42 161 7,25
3240110-0,35-50 110 55 174 7,65

Table 2
Magnetic circuit reference designation a h h1 c L* H* B Rmax Magnetic circuit weight, kg
Nomin. Extr. dev. Nomin. Nomin. Nomin. Nomin. Extr. dev.
510-14-0,15-400 0,4 5,0 +0,16 -0,30 14 7 14 43,0 24 10,0 +0,58 0,5 0,049
510-16-0,15-400 16 7 26 0,051
510-18-0,15-400 18 9 28 0,053
510-21-0,15-400 21 9 31 0,057
510-24-0,15-400 24 12 34 0,066
 
6,510-16-0,15-400 0,4 6,5 +0,20 -0,36 16 8 16 51,5 29 10,0 +0,58 0,6 0,072
6,510-18-0,15-400 18 8 31 0,075
6,510-20-0,15-400 20 10 33 0,078
6,510-23-0,15-400 23 10 36 0,083
6,510-26-0,15-400 26 13 39 0,087
 
812,5-18-0,15-400 0,4 8,0 +0,20 -0,36 18 9 18 60, 34 12,5 +,70 0,7 0,120
812,5-21-0,15-400 21 9 37 0,151
812,5-24-0,15-400 24 12 40 0,163
812,5-28-0,15-400 28 12 44 0,172
812,5-32-0,15-400 32 16 48 0,170
 
1016-20-0,15-400 0,4 10,0 +0,20 -0,36 20,0 10,0 20 70,0 40,0 16 +0,7 0,8 0,240
1016-23-0,15-400 23,0 10,0 43,0 0,250
1016-26-0,15-400 26,0 13,0 46,0 0,260
1016-31-0,15-400 31,0 13,0 51,0 0,275
1016-36-0,15-400 36,0 18,0 56,0 0,290
 
12,520-25-0,15-400 0,5 12,5 +0,24 -0,43 25,0 12,5 25 87,5 50 20 +0,84 0,9 0,470
12,520-29-0,15-400 29,0 12,5 54 0,490
12,520-33-0,15-400 33,0 16,5 58 0,510
12,520-38-0,15-400 38,5 16,5 63,5 0,525
12,520-44-0,15-400 44,0 22,0 69 0,560
 
1625-32-0,15-400 0,6 16,0 +0,24
-0,43
32,0 16,0 32 112 64,0 25 +0,84 1,0 0,970
1625-37-0,15-400 37,0 16,0 69,0 1,020
1625-42-0,15-400 42,0 21,0 74,0 1,070
1625-49-0,15-400 49,0 21,0 81,0 1,140
1625-56-0,15-400 56,0 28,0 88,0 1,220
 
2032-40-0,15-400 0,7 20 +0,28
-0,52
40,0 20,0 40 140 80,0 32 +1,0 1,1 1,900
2032-47-0,15-400 47,0 20,0 87,0 2,000
2032-54-0,15-400 54,0 27,0 94,0 2,100
2032-62-0,15-400 62,0 27,0 102,0 2,250
2032-70-0,15-400 70,0 35,0 110,0 2,400
 
2540-50-0,15-400 +0,8 25 +0,28
-0,52
50,0 25,0 50 175 100,0 40 1,0 1,2 3,700
2540-58-0,15-400 58,0 25,0 108,0 3,850
2540-66-0,15-400 66,0 33,0 116,0 4,00
2540-77-0,15-400 77,0 33,0 127,0 4,400
2540-88-0,15-400 88,0 44,0 138,0 4,60
 
3240-64-0,15-400 +1,0 32 +0,34-0,62 64 32 64 224 128 40 +1,0 1,3 5,900
3240-74-0,15-400 74 32 138 6,250
3240-84-0,15-400 84 42 148 6,600
3240-97-0,15-400 97 42 161 7,000
3240-110-0,15-400 110 55 174 7,600

 

1.2. Magnetic circuit reference designation consists of initial letters of words "three-phase" (T), "strap" () and figures, which designate accordingly rod dimensions, aperture height, band thickness and frequency, at which magnetic circuit is inspected for compliance with requirements of existing standard.

 

Specification

2.1.1 General requirements
2.1.1. Magnetic circuit should be produced according to the requirements of existing standard.
2.1.2. Materials and semifinished goods used during magnetic circuit production should have appropriate documentation, which confirms their operability in conditions at least equal to the requirements of existing standard.
2.2. Design requirements
2.2.1. Magnetic circuits design and dimensions should comply with Drawing 1 and Table 1 and 2.
2.2.2. Magnetic circuit surface should be without any dirt marks, dints and other mechanical damages and also without corrosion marks.
2.2.3. Magnetic circuits should be monolithic, butt end opening is not allowed.
Note: 1. Gaps between plates are allowed in core mass.
2. Plates recess by width up to 5% of rod thickness is allowed.
3. Glueing of plates, which are separated during magnetic circuit butt end depreservation, with -4 glue according to 12127-74 or equivalent is allowed by consumer.
2.2.4. Magnetic circuit weight should comply with the data specified in Table 1 and 2.

 

Required Electrical Parameters

2.3.1. Excitation current value and power loss of magnetic circuits should comply with data specified in Table3 for magnetic circuits with frequency of 50Hz and in Table 4 for magnetic circuits with frequency of 400Hz.

Table 3
Magnetic circuit dimension type Induction,,
Wb/m2
Current value, A, not more than Power loss, W, not more than Impressed voltage, phase, V Winding turn number W1=W2 Winding wire diameter,
mm
12,520-25 1,5 30,036 - 73,5 950 0,2
12,520-29 30,038
12,520-33 30,040
12,520-38,5 30,042
12,520-44 30,044
 
1625-32 1,5 30,070 - 73,5 591 0,29
1625-37 30,073
1625-42 30,076
1625-49 30,081
1625-56 30,086
 
2032-40 1,5 30,130 5,0 73,5 370 0,44
2032-47 30,137 5,2
2032-54 30,144 5,5
2032-62 30,153 5,8
2032-70 30,162 6,1
 
2540-50 1,45 30,215   73,5 245 0,8
2540-58 30,225
2540-66 30,235
2540-77 30,250
2540-88 30,267
 
324064       73,5 198 1,0
324074
324084
324097
3240110

Table 4
Magnetic circuit dimension type Induction,
Wb/m2
Current value, A, not more than Power loss, W, not more than Impressed voltage, phase, V Winding turn number W1=W2 Winding wire diameter,
mm
510-14 1,4 30,058 - 73,5 655 0,11
510-16 30,060
510-18 30,062
510-21 30,065
510-24 30,068
 
6,510-16 1,4 30,080 - 73,5 508 0,15
6,510-18 30,082
6,510-20 30,084
6,510-23 30,07
6,510-26 30,090
 
812,5-18 1,4 30,125 3,9 73,5 327 0,21
812,5-21 30,130 4,1
812,5-24 30,135 4,3
812,5-28 30,140 4,6
812,5-32 30,145 4,9
 
1016-20 1,4 30,210 6,9 73,5 204 0,35
1016-23 30,217 7,2
1016-26 30,225 7,6
1016-31 30,232 8,2
1016-36 30,240 8,8
 
12,520-25 1,32 30,290 11,8 73,5 139 0,51
12,520-29 30,300 12,4
12,520-33 30,310 13,1
12,520-38,5 30,320 13,8
12,520-44 30,330 14,6
 
1625-32 1,13 30,330 17,8 73,5 102 0,64
1625-37 30,342 18,6
1625-42 30,355 19,5
1625-49 30,372 20,8
1625-56 30,390 22,2
 
2032-40 0,96 30,380 24,4 73,5 76 0,80
2032-47 30,395 25,9
2032-54 30,410 27,5
2032-62 30,427 29,2
2032-70 30,445 31,0
 
2540-50 0,81 30,450 33,6 73,5 57 0,93
2540-58 30,470 35,5
2540-66 30,490 37,5
2540-77 30,517 40,0
2540-88 30,545 42,0
 
324064 0,73 30,490 44,5 73,5 49 1,16
324074 30,515 47,2
324084 30,540 50,0
324097 30,570 53,0
3240110 30,600 56,0
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