Products: LT Instrument Transformers

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Mainly used for differential protection in order to match the ratios of main feeder CTs, which can protect sensitive instruments and devices during a fault. These CTs will saturate and limit their secondary currents within specified values.

Summation Current Transformers: These are used to measure sum of the currents in more than one line from the same phase of the system. Normally used for monitoring total current/power drawn from a system. Input to a Summation CT should be from the individual line CTs. It is necessary for the Line CTs to have same secondary currents. The out puts from Line CTs 500/5 A, 200/5A, 150/5A ...(not 150/1A...) can be connected to a summation CT Primary windings.

Interposing Current Transformers: Mainly used for differntial protection in order to match the ratios of main feeder CTs. These can also be used as saturation CTs, which can protect sensitive Instruments and devices during a fault. These CTs will saturate and limit their secondary currents within specified values.

Cast Resin Types: Recommended for higher mechanical strength and safety. Ideal for use in corosive atmosphere. All the above mentioned types of CTs can be supplies in Cast Resin Construction also.turate and limit their secondary currents within specified values.

Neutral Current Transformers: Used for measuring unbalance current in the neutral of a three phase system. Since the neutral current should be zero in a balance three phase system, the primary of these CTs are related for a fraction of the line currents in that system.

  Enquiries
The following details if furnished with enquiries can help us to quote the right type of Transformers for your specific requirement
  Type   Purpose   Ratio   Burden
  Rct*   Vk*   Accuracy   System Voltage
Limiting Dimensions and ID requirements (*For Protection class CT's only)

Standard Ranges & Dimensions

Bar Primary Tape Wound
Ratio
Amps

Rated
VA

Acc
Class

Dimensions in mm
ID OD DEPT
50/5 5 3 30 85 50
100/5 5 1 30 85 50
150/5 5 1 30 85 50
200/5 5 1 30 85 50
300/5 10 1 50 100 50
400/5 15 1 50 100 50
600/5 15 1 50 100 50
800/5 15 1 75 120 50
1000/5 15 1 75 120 40
1500/5 15 1 85 130 40
2000/5 15 1 100 140 40
3000/5 15 1 125 170 40


 
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