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| C.T.
(Current Transformer) |
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| Current
transformers are made in a range of measuring and protection
type considering quality, accurancy and reliability as prime
factors. VOLTAMP Current transformers can be used for metric
and imperial size bars. Current Transformers are made from
high magnetic performance prime CRGO Silicon Electrical
Steel. The performance of the core is checked to meet final
parameters such as ratio, rating and accuracy. The current
transformer is finally completed by placing PVC washers
on top and bottom and then taped closely with polyester
film and polyvinyl chloride tape. Proper lugs are provided
on secondary terminals with S1 and S2 markings. Anodised
Name plate is slipped within outer tape mentioning specifications
and P1, P2 direction. |
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In
addition to the above we can offer Current Transformers to your
requirement with various combinations of
- Ratios
- Burden
- Accuracy
Class
- Type
*Subject to technical feasibility.
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| Application |
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- Suitable for Ammeters .
- Wattmeters.
- Power Factor meters and Protective Relays.
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| Suggested
Burden Guide |
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- Moving Iron Ammeters 1.5 VA to 5 VA
- Recording Ammeters 2 VA to 10 VA
- Recording Thermal Demand Wattmeters0.7 VA to 1.4 VA
- KWH Meters0.3 VA to 0.6 VA
- Thermal Demand Ammeters3 VA
- Thermal Maximum Demand Ammeters4 VA to 8 VA
Cable 7/029 5 Amp Secondary 0.05 VA/ft
Cable 7/029 1 Amp Secondary 0.002 VA/ft |
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| Specifications |
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- Designed in accordance to : BS 3938, IS 2705 and IEC 185
- Dielectric Test : 2500 V/4000 V r.m.s.
- Temperature range : -40 to + 70C Ambient
- Rated Frequency : 50/60 Hz
- Line Voltage : 660/11000 Volts max.
- Test Voltage : 2500 Volts / 4000 V r.m.s.
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| LIMITS
OF ERRORS FOR ACCURACY CLASSES
0.1 TO 5.0
(Clauses 3.21 and 4.1
and 3.2.2) ISS 2705/92 : |
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Accuracy
Class |
± Percentage Current (Ratio) Error
At Percentage of Rated Current |
± Phase Displacement in Minutes
At Percentage of Rated Current |
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5 |
20 |
50 |
100 |
120 |
5 |
20 |
100 |
120 |
| 0.1 |
0.4 |
0.2 |
Not
Applicable |
0.1 |
0.1 |
15 |
8 |
5 |
5 |
| 0.2 |
0.75 |
0.35 |
0.2 |
0.2 |
30 |
15 |
10 |
10 |
| 0.5 |
1.5 |
0.75 |
0.5 |
0.5 |
90 |
45 |
30 |
30 |
| 1.0 |
3.0 |
1.5 |
1.0 |
1.0 |
180 |
90 |
60 |
60 |
| 3.0 |
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3.0 |
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3.0 |
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| 5.0 |
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5.0 |
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5.0 |
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