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Control Transformers

Control Transformers 

Tri Phase Controls Panel Transformers offer 230V and 400V with adjustment tappings. Designed and manufactured to comply with IEC61558.

This high quality product is manufactured using automated winding and welding machines; they offer good access to the four-hole fixing, finger-proof terminals and full varnish impregnation to protect against humidity.

Transformer Circuit Protection

Transformers must be protected against short circuit and overload.

Primary Circuit

The primary side of the Transformer should be protected against short circuit thereby cutting the supply voltage in the event of a short circuit fault. The rating of the primary protection device has to take into account the high inrush current during energising of the Transformer.

The table below gives suggested protection values to avoid nuisance tripping on inrush:

Rating VA Primary Volts Amps Fuse Type C MCB Type D MCB Primary Volts Amps Fuse Type C MCB Type D MCB
50 230 0.21 1 1 1 415 0.12 500mA 1 1
75 230 0.27 1 1 1 415 0.15 500mA 1 1
100 230 0.43 1 2 1 415 0.24 1 1 1
150 230 0.65 2 2 1 415 0.36 1 1 1
200 230 0.86 2 6 2 415 0.48 1 2 1
 
250 230 1.09 3.15 6 2 415 0.60 2 2 1
300 230 1.2 3.15 6 3 415 0.72 2 2 2
500 230 2.17 4 10 6 415 1.20 3.15 6 4
750 230 3.26 6 10 6 415 1.80 3.15 6 4
1000 230 4.34 8 10 6 415 2.40 5 6 4
 
1500 230 6.52 10 16 10 415 3.61 6 10 6
2000 230 8.69 12 16 10 415 4.82 10 10 6
2500 230 10.86 16 25 16 415 6.02 10 16 10

Secondary Circuit

The secondary circuit should be protected against short circuit and overload.

The value of the protection should be the same or less than the rated output current.

Part No. VA A B C D E Weight Kg % Reg. Watts Loss Inrush VA For 10% Volt drop Inrush VA For 5% Volt drop
CL25 66 68 77 50 44 0.7 11 6 48 36
CL50 76 70 86 56 47 1.1 9.8 9 105 77
CL75 76 76 86 56 53 1.5 8.9 11 135 102
CL100 84 78 95 64 63 2.1 8.4 14 250 175
CL150 96 76 102 84 65 2.25 6.7 18 375 260
 
CL200 96 86 102 84 72 2.8 5.8 21 550 375
CL250 96 101 102 84 90 3.7 5.6 27 720 470
CL300 120 88 122 90 73 4.4 5.3 31 870 585
CL400 120 100 122 90 85 5.3 5.0 30 1200 790
CL500 120 120 122 90 106 6.5 4.1 31 1700 1100
 
CL750 150 110 140 122 90 8.0 5.2 60 2200 1475
CL1000 150 161 140 122 106 10.0 3.3 67 4000 2500
CL1500 150 188 140 122 134 14.0 3.2 88 6200 3850
CL2000 192 172 180 160 125 20.5 3.3 100 8060 5030
CL2500 192 192 180 160 153 24.0 2.6 120 12100 7300

Voltage Options and Part Numbers

Winding Voltage Code
Primary 15-0-15-230-400V  
Secondary 0-12V J
  0-24V B
  0-48V E
  0-110V F
  0-230V U

For a 100VA transformer, with an output of 100V, the part number would be MCL100F.

Power Rating Calculation

To choose the size of Transformer required for an application the total inrush VA must be calculated. This figure is then applied to the table above with the maximum allowable voltage drop taken into account. For example, for a calculated inrush of 2,100VA the appropriate transformer is as follows:

  1. For 10% drop in output volts during inrush, choose 750VA
  2. For 5% drop in output volts during inrush, choose 1000VA

Consideration must also be given to the continuous VA requirement.